regl-ladder

README.md

Rough draft of this chart.

We started out with a SVG animation, tried out Elijah's canvas sankey particles and ended up rewriting in regl to get more dots on the screen.

The final version gets better performance by passing in array of attibutes to the vertex shader - I'm not sure why that is.

Update: Ricky Reusser points out that I was creating a new array of points every frame with:

attributes: {x: () => data.map(d => d.x)}

This is faster:

attributes: {x: => data.map(d => d.x)}

Also! pow is undefined for negative numbers, so the points take a different path on different devices.

_script.js

try { window.regltick.cancel() } catch (e) {}
console.clear()

var sel = d3.select('#graph').html('')

c = d3.conventions({
  sel,
  layers: 'ds',
  margin: { left: 0, bottom: 0, right: 0, top: 0 },
  width: 960,
  height: 500
})

var count = 20000
var yScale = d3.scaleLinear()
  .domain([0, 4])
  .range([-0.8, 0.8])

var wScale = d3.scaleThreshold()
  .domain([0.1, 0.2, 0.35, 0.6])
  .range([0, 1, 2, 3, 4])

var bScale = d3.scaleThreshold()
  .domain([0.21, 0.42, 0.63, 0.83])
  .range([0, 1, 2, 3, 4])

var data = d3.range(count).map(i => {
  var isB = i % 2
  var q = (isB ? bScale : wScale)(i / count)

  return {
    speed: Math.random() * 2 + 1,
    x: Math.random() * 2 - 1,
    y0: yScale(0),
    y1: yScale(q),
    dy: Math.random() * 0.3,
    isB
  }
})

data = _.shuffle(data)

c.x.range([0, c.width])
c.y.range([c.height, 0])

reglLib({ onDone, container: c.layers[0].node() })

function onDone(err, regl) {
  if (err) return console.log(err)
  window.regl = regl

  var drawPoints = regl({
    vert: `
      precision mediump float;
      attribute float speed, x, y0, y1, dy;
      attribute float isB;
      varying float c;
      uniform float interp;      
      void main() {
        float t = mod(x + interp*speed, 1.0);
        
        // cubic ease
        float ct = t < 0.5
          ? 4.0 * t * t * t
          : -0.5 * pow(abs(2.0 * t - 2.0), 3.0) + 1.0;

        float x = mix(-1.0, 1.0, t);
        float y = mix(y0, y1, ct);

        gl_Position = vec4(x, y + dy, 0, 1);
        gl_PointSize = 4.0;

        c = isB;
      }`,

    frag: `
      precision mediump float;
      varying float c;
      void main() {
        vec4 blue = vec4(0.00, 0.65, 1.00, 1);
        vec4 orng = vec4(0.99, 0.45, .011, 1);

        gl_FragColor = c == 1.0 ? blue : orng;
      }`,

    attributes: {
      speed: data.map(d => d.speed),
      x:  data.map(d => d.x),
      y0: data.map(d => d.y0),
      y1: data.map(d => d.y1),
      dy: data.map(d => d.dy),
      isB: data.map(d => d.isB)
    },
    uniforms: {
      interp: (ctx, props) => props.interp
    },
    primitive: 'point',
    count
  })

  window.regltick = regl.frame(({ time }) => {
    drawPoints({ interp: time / 40 })
  })
}

d3+_.js

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n},Mn.prototype.reverse=function(){if(this.__filtered__){var n=new Mn(this);n.__dir__=-1,n.__filtered__=true}else n=this.clone(),n.__dir__*=-1;return n},Mn.prototype.value=function(){var n,t=this.__wrapped__.value(),r=this.__dir__,e=af(t),u=0>r,i=e?t.length:0;n=i;for(var o=this.__views__,f=0,c=-1,a=o.length;++c<a;){var l=o[c],s=l.size;switch(l.type){case"drop":f+=s;break;case"dropRight":n-=s;break;case"take":n=Mi(n,f+s);break;case"takeRight":f=Di(f,n-s)}}if(n={start:f,end:n},o=n.start,f=n.end,n=f-o,
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var n=this.__index__>=this.__values__.length;return{done:n,value:n?F:this.__values__[this.__index__++]}},On.prototype.plant=function(n){for(var t,r=this;r instanceof Sn;){var e=Pe(r);e.__index__=0,e.__values__=F,t?u.__wrapped__=e:t=e;var u=e,r=r.__wrapped__}return u.__wrapped__=n,t},On.prototype.reverse=function(){var n=this.__wrapped__;return n instanceof Mn?(this.__actions__.length&&(n=new Mn(this)),n=n.reverse(),n.__actions__.push({func:nu,args:[Je],thisArg:F}),new zn(n,this.__chain__)):this.thru(Je);
},On.prototype.toJSON=On.prototype.valueOf=On.prototype.value=function(){return kr(this.__wrapped__,this.__actions__)},On.prototype.first=On.prototype.head,Ai&&(On.prototype[Ai]=tu),On}();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(Zn._=it, define(function(){return it})):Vn?((Vn.exports=it)._=it,qn._=it):Zn._=it}).call(this);(function (global, factory) {
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  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (factory((global.d3 = global.d3 || {})));
}(this, (function (exports) { 'use strict';

var version = "4.10.2";

var ascending = function(a, b) {
  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
};

var bisector = function(compare) {
  if (compare.length === 1) compare = ascendingComparator(compare);
  return {
    left: function(a, x, lo, hi) {
      if (lo == null) lo = 0;
      if (hi == null) hi = a.length;
      while (lo < hi) {
        var mid = lo + hi >>> 1;
        if (compare(a[mid], x) < 0) lo = mid + 1;
        else hi = mid;
      }
      return lo;
    },
    right: function(a, x, lo, hi) {
      if (lo == null) lo = 0;
      if (hi == null) hi = a.length;
      while (lo < hi) {
        var mid = lo + hi >>> 1;
        if (compare(a[mid], x) > 0) hi = mid;
        else lo = mid + 1;
      }
      return lo;
    }
  };
};

function ascendingComparator(f) {
  return function(d, x) {
    return ascending(f(d), x);
  };
}

var ascendingBisect = bisector(ascending);
var bisectRight = ascendingBisect.right;
var bisectLeft = ascendingBisect.left;

var pairs = function(array, f) {
  if (f == null) f = pair;
  var i = 0, n = array.length - 1, p = array[0], pairs = new Array(n < 0 ? 0 : n);
  while (i < n) pairs[i] = f(p, p = array[++i]);
  return pairs;
};

function pair(a, b) {
  return [a, b];
}

var cross = function(values0, values1, reduce) {
  var n0 = values0.length,
      n1 = values1.length,
      values = new Array(n0 * n1),
      i0,
      i1,
      i,
      value0;

  if (reduce == null) reduce = pair;

  for (i0 = i = 0; i0 < n0; ++i0) {
    for (value0 = values0[i0], i1 = 0; i1 < n1; ++i1, ++i) {
      values[i] = reduce(value0, values1[i1]);
    }
  }

  return values;
};

var descending = function(a, b) {
  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
};

var number = function(x) {
  return x === null ? NaN : +x;
};

var variance = function(values, valueof) {
  var n = values.length,
      m = 0,
      i = -1,
      mean = 0,
      value,
      delta,
      sum = 0;

  if (valueof == null) {
    while (++i < n) {
      if (!isNaN(value = number(values[i]))) {
        delta = value - mean;
        mean += delta / ++m;
        sum += delta * (value - mean);
      }
    }
  }

  else {
    while (++i < n) {
      if (!isNaN(value = number(valueof(values[i], i, values)))) {
        delta = value - mean;
        mean += delta / ++m;
        sum += delta * (value - mean);
      }
    }
  }

  if (m > 1) return sum / (m - 1);
};

var deviation = function(array, f) {
  var v = variance(array, f);
  return v ? Math.sqrt(v) : v;
};

var extent = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      min,
      max;

  if (valueof == null) {
    while (++i < n) { // Find the first comparable value.
      if ((value = values[i]) != null && value >= value) {
        min = max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = values[i]) != null) {
            if (min > value) min = value;
            if (max < value) max = value;
          }
        }
      }
    }
  }

  else {
    while (++i < n) { // Find the first comparable value.
      if ((value = valueof(values[i], i, values)) != null && value >= value) {
        min = max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = valueof(values[i], i, values)) != null) {
            if (min > value) min = value;
            if (max < value) max = value;
          }
        }
      }
    }
  }

  return [min, max];
};

var array = Array.prototype;

var slice = array.slice;
var map = array.map;

var constant = function(x) {
  return function() {
    return x;
  };
};

var identity = function(x) {
  return x;
};

var range = function(start, stop, step) {
  start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;

  var i = -1,
      n = Math.max(0, Math.ceil((stop - start) / step)) | 0,
      range = new Array(n);

  while (++i < n) {
    range[i] = start + i * step;
  }

  return range;
};

var e10 = Math.sqrt(50);
var e5 = Math.sqrt(10);
var e2 = Math.sqrt(2);

var ticks = function(start, stop, count) {
  var reverse = stop < start,
      i = -1,
      n,
      ticks,
      step;

  if (reverse) n = start, start = stop, stop = n;

  if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];

  if (step > 0) {
    start = Math.ceil(start / step);
    stop = Math.floor(stop / step);
    ticks = new Array(n = Math.ceil(stop - start + 1));
    while (++i < n) ticks[i] = (start + i) * step;
  } else {
    start = Math.floor(start * step);
    stop = Math.ceil(stop * step);
    ticks = new Array(n = Math.ceil(start - stop + 1));
    while (++i < n) ticks[i] = (start - i) / step;
  }

  if (reverse) ticks.reverse();

  return ticks;
};

function tickIncrement(start, stop, count) {
  var step = (stop - start) / Math.max(0, count),
      power = Math.floor(Math.log(step) / Math.LN10),
      error = step / Math.pow(10, power);
  return power >= 0
      ? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power)
      : -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);
}

function tickStep(start, stop, count) {
  var step0 = Math.abs(stop - start) / Math.max(0, count),
      step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
      error = step0 / step1;
  if (error >= e10) step1 *= 10;
  else if (error >= e5) step1 *= 5;
  else if (error >= e2) step1 *= 2;
  return stop < start ? -step1 : step1;
}

var sturges = function(values) {
  return Math.ceil(Math.log(values.length) / Math.LN2) + 1;
};

var histogram = function() {
  var value = identity,
      domain = extent,
      threshold = sturges;

  function histogram(data) {
    var i,
        n = data.length,
        x,
        values = new Array(n);

    for (i = 0; i < n; ++i) {
      values[i] = value(data[i], i, data);
    }

    var xz = domain(values),
        x0 = xz[0],
        x1 = xz[1],
        tz = threshold(values, x0, x1);

    // Convert number of thresholds into uniform thresholds.
    if (!Array.isArray(tz)) {
      tz = tickStep(x0, x1, tz);
      tz = range(Math.ceil(x0 / tz) * tz, Math.floor(x1 / tz) * tz, tz); // exclusive
    }

    // Remove any thresholds outside the domain.
    var m = tz.length;
    while (tz[0] <= x0) tz.shift(), --m;
    while (tz[m - 1] > x1) tz.pop(), --m;

    var bins = new Array(m + 1),
        bin;

    // Initialize bins.
    for (i = 0; i <= m; ++i) {
      bin = bins[i] = [];
      bin.x0 = i > 0 ? tz[i - 1] : x0;
      bin.x1 = i < m ? tz[i] : x1;
    }

    // Assign data to bins by value, ignoring any outside the domain.
    for (i = 0; i < n; ++i) {
      x = values[i];
      if (x0 <= x && x <= x1) {
        bins[bisectRight(tz, x, 0, m)].push(data[i]);
      }
    }

    return bins;
  }

  histogram.value = function(_) {
    return arguments.length ? (value = typeof _ === "function" ? _ : constant(_), histogram) : value;
  };

  histogram.domain = function(_) {
    return arguments.length ? (domain = typeof _ === "function" ? _ : constant([_[0], _[1]]), histogram) : domain;
  };

  histogram.thresholds = function(_) {
    return arguments.length ? (threshold = typeof _ === "function" ? _ : Array.isArray(_) ? constant(slice.call(_)) : constant(_), histogram) : threshold;
  };

  return histogram;
};

var quantile = function(values, p, valueof) {
  if (valueof == null) valueof = number;
  if (!(n = values.length)) return;
  if ((p = +p) <= 0 || n < 2) return +valueof(values[0], 0, values);
  if (p >= 1) return +valueof(values[n - 1], n - 1, values);
  var n,
      i = (n - 1) * p,
      i0 = Math.floor(i),
      value0 = +valueof(values[i0], i0, values),
      value1 = +valueof(values[i0 + 1], i0 + 1, values);
  return value0 + (value1 - value0) * (i - i0);
};

var freedmanDiaconis = function(values, min, max) {
  values = map.call(values, number).sort(ascending);
  return Math.ceil((max - min) / (2 * (quantile(values, 0.75) - quantile(values, 0.25)) * Math.pow(values.length, -1 / 3)));
};

var scott = function(values, min, max) {
  return Math.ceil((max - min) / (3.5 * deviation(values) * Math.pow(values.length, -1 / 3)));
};

var max = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      max;

  if (valueof == null) {
    while (++i < n) { // Find the first comparable value.
      if ((value = values[i]) != null && value >= value) {
        max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = values[i]) != null && value > max) {
            max = value;
          }
        }
      }
    }
  }

  else {
    while (++i < n) { // Find the first comparable value.
      if ((value = valueof(values[i], i, values)) != null && value >= value) {
        max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = valueof(values[i], i, values)) != null && value > max) {
            max = value;
          }
        }
      }
    }
  }

  return max;
};

var mean = function(values, valueof) {
  var n = values.length,
      m = n,
      i = -1,
      value,
      sum = 0;

  if (valueof == null) {
    while (++i < n) {
      if (!isNaN(value = number(values[i]))) sum += value;
      else --m;
    }
  }

  else {
    while (++i < n) {
      if (!isNaN(value = number(valueof(values[i], i, values)))) sum += value;
      else --m;
    }
  }

  if (m) return sum / m;
};

var median = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      numbers = [];

  if (valueof == null) {
    while (++i < n) {
      if (!isNaN(value = number(values[i]))) {
        numbers.push(value);
      }
    }
  }

  else {
    while (++i < n) {
      if (!isNaN(value = number(valueof(values[i], i, values)))) {
        numbers.push(value);
      }
    }
  }

  return quantile(numbers.sort(ascending), 0.5);
};

var merge = function(arrays) {
  var n = arrays.length,
      m,
      i = -1,
      j = 0,
      merged,
      array;

  while (++i < n) j += arrays[i].length;
  merged = new Array(j);

  while (--n >= 0) {
    array = arrays[n];
    m = array.length;
    while (--m >= 0) {
      merged[--j] = array[m];
    }
  }

  return merged;
};

var min = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      min;

  if (valueof == null) {
    while (++i < n) { // Find the first comparable value.
      if ((value = values[i]) != null && value >= value) {
        min = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = values[i]) != null && min > value) {
            min = value;
          }
        }
      }
    }
  }

  else {
    while (++i < n) { // Find the first comparable value.
      if ((value = valueof(values[i], i, values)) != null && value >= value) {
        min = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = valueof(values[i], i, values)) != null && min > value) {
            min = value;
          }
        }
      }
    }
  }

  return min;
};

var permute = function(array, indexes) {
  var i = indexes.length, permutes = new Array(i);
  while (i--) permutes[i] = array[indexes[i]];
  return permutes;
};

var scan = function(values, compare) {
  if (!(n = values.length)) return;
  var n,
      i = 0,
      j = 0,
      xi,
      xj = values[j];

  if (compare == null) compare = ascending;

  while (++i < n) {
    if (compare(xi = values[i], xj) < 0 || compare(xj, xj) !== 0) {
      xj = xi, j = i;
    }
  }

  if (compare(xj, xj) === 0) return j;
};

var shuffle = function(array, i0, i1) {
  var m = (i1 == null ? array.length : i1) - (i0 = i0 == null ? 0 : +i0),
      t,
      i;

  while (m) {
    i = Math.random() * m-- | 0;
    t = array[m + i0];
    array[m + i0] = array[i + i0];
    array[i + i0] = t;
  }

  return array;
};

var sum = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      sum = 0;

  if (valueof == null) {
    while (++i < n) {
      if (value = +values[i]) sum += value; // Note: zero and null are equivalent.
    }
  }

  else {
    while (++i < n) {
      if (value = +valueof(values[i], i, values)) sum += value;
    }
  }

  return sum;
};

var transpose = function(matrix) {
  if (!(n = matrix.length)) return [];
  for (var i = -1, m = min(matrix, length), transpose = new Array(m); ++i < m;) {
    for (var j = -1, n, row = transpose[i] = new Array(n); ++j < n;) {
      row[j] = matrix[j][i];
    }
  }
  return transpose;
};

function length(d) {
  return d.length;
}

var zip = function() {
  return transpose(arguments);
};

var slice$1 = Array.prototype.slice;

var identity$1 = function(x) {
  return x;
};

var top = 1;
var right = 2;
var bottom = 3;
var left = 4;
var epsilon = 1e-6;

function translateX(x) {
  return "translate(" + (x + 0.5) + ",0)";
}

function translateY(y) {
  return "translate(0," + (y + 0.5) + ")";
}

function number$1(scale) {
  return function(d) {
    return +scale(d);
  };
}

function center(scale) {
  var offset = Math.max(0, scale.bandwidth() - 1) / 2; // Adjust for 0.5px offset.
  if (scale.round()) offset = Math.round(offset);
  return function(d) {
    return +scale(d) + offset;
  };
}

function entering() {
  return !this.__axis;
}

function axis(orient, scale) {
  var tickArguments = [],
      tickValues = null,
      tickFormat = null,
      tickSizeInner = 6,
      tickSizeOuter = 6,
      tickPadding = 3,
      k = orient === top || orient === left ? -1 : 1,
      x = orient === left || orient === right ? "x" : "y",
      transform = orient === top || orient === bottom ? translateX : translateY;

  function axis(context) {
    var values = tickValues == null ? (scale.ticks ? scale.ticks.apply(scale, tickArguments) : scale.domain()) : tickValues,
        format = tickFormat == null ? (scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments) : identity$1) : tickFormat,
        spacing = Math.max(tickSizeInner, 0) + tickPadding,
        range = scale.range(),
        range0 = +range[0] + 0.5,
        range1 = +range[range.length - 1] + 0.5,
        position = (scale.bandwidth ? center : number$1)(scale.copy()),
        selection = context.selection ? context.selection() : context,
        path = selection.selectAll(".domain").data([null]),
        tick = selection.selectAll(".tick").data(values, scale).order(),
        tickExit = tick.exit(),
        tickEnter = tick.enter().append("g").attr("class", "tick"),
        line = tick.select("line"),
        text = tick.select("text");

    path = path.merge(path.enter().insert("path", ".tick")
        .attr("class", "domain")
        .attr("stroke", "#000"));

    tick = tick.merge(tickEnter);

    line = line.merge(tickEnter.append("line")
        .attr("stroke", "#000")
        .attr(x + "2", k * tickSizeInner));

    text = text.merge(tickEnter.append("text")
        .attr("fill", "#000")
        .attr(x, k * spacing)
        .attr("dy", orient === top ? "0em" : orient === bottom ? "0.71em" : "0.32em"));

    if (context !== selection) {
      path = path.transition(context);
      tick = tick.transition(context);
      line = line.transition(context);
      text = text.transition(context);

      tickExit = tickExit.transition(context)
          .attr("opacity", epsilon)
          .attr("transform", function(d) { return isFinite(d = position(d)) ? transform(d) : this.getAttribute("transform"); });

      tickEnter
          .attr("opacity", epsilon)
          .attr("transform", function(d) { var p = this.parentNode.__axis; return transform(p && isFinite(p = p(d)) ? p : position(d)); });
    }

    tickExit.remove();

    path
        .attr("d", orient === left || orient == right
            ? "M" + k * tickSizeOuter + "," + range0 + "H0.5V" + range1 + "H" + k * tickSizeOuter
            : "M" + range0 + "," + k * tickSizeOuter + "V0.5H" + range1 + "V" + k * tickSizeOuter);

    tick
        .attr("opacity", 1)
        .attr("transform", function(d) { return transform(position(d)); });

    line
        .attr(x + "2", k * tickSizeInner);

    text
        .attr(x, k * spacing)
        .text(format);

    selection.filter(entering)
        .attr("fill", "none")
        .attr("font-size", 10)
        .attr("font-family", "sans-serif")
        .attr("text-anchor", orient === right ? "start" : orient === left ? "end" : "middle");

    selection
        .each(function() { this.__axis = position; });
  }

  axis.scale = function(_) {
    return arguments.length ? (scale = _, axis) : scale;
  };

  axis.ticks = function() {
    return tickArguments = slice$1.call(arguments), axis;
  };

  axis.tickArguments = function(_) {
    return arguments.length ? (tickArguments = _ == null ? [] : slice$1.call(_), axis) : tickArguments.slice();
  };

  axis.tickValues = function(_) {
    return arguments.length ? (tickValues = _ == null ? null : slice$1.call(_), axis) : tickValues && tickValues.slice();
  };

  axis.tickFormat = function(_) {
    return arguments.length ? (tickFormat = _, axis) : tickFormat;
  };

  axis.tickSize = function(_) {
    return arguments.length ? (tickSizeInner = tickSizeOuter = +_, axis) : tickSizeInner;
  };

  axis.tickSizeInner = function(_) {
    return arguments.length ? (tickSizeInner = +_, axis) : tickSizeInner;
  };

  axis.tickSizeOuter = function(_) {
    return arguments.length ? (tickSizeOuter = +_, axis) : tickSizeOuter;
  };

  axis.tickPadding = function(_) {
    return arguments.length ? (tickPadding = +_, axis) : tickPadding;
  };

  return axis;
}

function axisTop(scale) {
  return axis(top, scale);
}

function axisRight(scale) {
  return axis(right, scale);
}

function axisBottom(scale) {
  return axis(bottom, scale);
}

function axisLeft(scale) {
  return axis(left, scale);
}

var noop = {value: function() {}};

function dispatch() {
  for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {
    if (!(t = arguments[i] + "") || (t in _)) throw new Error("illegal type: " + t);
    _[t] = [];
  }
  return new Dispatch(_);
}

function Dispatch(_) {
  this._ = _;
}

function parseTypenames(typenames, types) {
  return typenames.trim().split(/^|\s+/).map(function(t) {
    var name = "", i = t.indexOf(".");
    if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
    if (t && !types.hasOwnProperty(t)) throw new Error("unknown type: " + t);
    return {type: t, name: name};
  });
}

Dispatch.prototype = dispatch.prototype = {
  constructor: Dispatch,
  on: function(typename, callback) {
    var _ = this._,
        T = parseTypenames(typename + "", _),
        t,
        i = -1,
        n = T.length;

    // If no callback was specified, return the callback of the given type and name.
    if (arguments.length < 2) {
      while (++i < n) if ((t = (typename = T[i]).type) && (t = get(_[t], typename.name))) return t;
      return;
    }

    // If a type was specified, set the callback for the given type and name.
    // Otherwise, if a null callback was specified, remove callbacks of the given name.
    if (callback != null && typeof callback !== "function") throw new Error("invalid callback: " + callback);
    while (++i < n) {
      if (t = (typename = T[i]).type) _[t] = set(_[t], typename.name, callback);
      else if (callback == null) for (t in _) _[t] = set(_[t], typename.name, null);
    }

    return this;
  },
  copy: function() {
    var copy = {}, _ = this._;
    for (var t in _) copy[t] = _[t].slice();
    return new Dispatch(copy);
  },
  call: function(type, that) {
    if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) args[i] = arguments[i + 2];
    if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
    for (t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
  },
  apply: function(type, that, args) {
    if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
    for (var t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
  }
};

function get(type, name) {
  for (var i = 0, n = type.length, c; i < n; ++i) {
    if ((c = type[i]).name === name) {
      return c.value;
    }
  }
}

function set(type, name, callback) {
  for (var i = 0, n = type.length; i < n; ++i) {
    if (type[i].name === name) {
      type[i] = noop, type = type.slice(0, i).concat(type.slice(i + 1));
      break;
    }
  }
  if (callback != null) type.push({name: name, value: callback});
  return type;
}

var xhtml = "http://www.w3.org/1999/xhtml";

var namespaces = {
  svg: "http://www.w3.org/2000/svg",
  xhtml: xhtml,
  xlink: "http://www.w3.org/1999/xlink",
  xml: "http://www.w3.org/XML/1998/namespace",
  xmlns: "http://www.w3.org/2000/xmlns/"
};

var namespace = function(name) {
  var prefix = name += "", i = prefix.indexOf(":");
  if (i >= 0 && (prefix = name.slice(0, i)) !== "xmlns") name = name.slice(i + 1);
  return namespaces.hasOwnProperty(prefix) ? {space: namespaces[prefix], local: name} : name;
};

function creatorInherit(name) {
  return function() {
    var document = this.ownerDocument,
        uri = this.namespaceURI;
    return uri === xhtml && document.documentElement.namespaceURI === xhtml
        ? document.createElement(name)
        : document.createElementNS(uri, name);
  };
}

function creatorFixed(fullname) {
  return function() {
    return this.ownerDocument.createElementNS(fullname.space, fullname.local);
  };
}

var creator = function(name) {
  var fullname = namespace(name);
  return (fullname.local
      ? creatorFixed
      : creatorInherit)(fullname);
};

var nextId = 0;

function local$1() {
  return new Local;
}

function Local() {
  this._ = "@" + (++nextId).toString(36);
}

Local.prototype = local$1.prototype = {
  constructor: Local,
  get: function(node) {
    var id = this._;
    while (!(id in node)) if (!(node = node.parentNode)) return;
    return node[id];
  },
  set: function(node, value) {
    return node[this._] = value;
  },
  remove: function(node) {
    return this._ in node && delete node[this._];
  },
  toString: function() {
    return this._;
  }
};

var matcher = function(selector) {
  return function() {
    return this.matches(selector);
  };
};

if (typeof document !== "undefined") {
  var element = document.documentElement;
  if (!element.matches) {
    var vendorMatches = element.webkitMatchesSelector
        || element.msMatchesSelector
        || element.mozMatchesSelector
        || element.oMatchesSelector;
    matcher = function(selector) {
      return function() {
        return vendorMatches.call(this, selector);
      };
    };
  }
}

var matcher$1 = matcher;

var filterEvents = {};

exports.event = null;

if (typeof document !== "undefined") {
  var element$1 = document.documentElement;
  if (!("onmouseenter" in element$1)) {
    filterEvents = {mouseenter: "mouseover", mouseleave: "mouseout"};
  }
}

function filterContextListener(listener, index, group) {
  listener = contextListener(listener, index, group);
  return function(event) {
    var related = event.relatedTarget;
    if (!related || (related !== this && !(related.compareDocumentPosition(this) & 8))) {
      listener.call(this, event);
    }
  };
}

function contextListener(listener, index, group) {
  return function(event1) {
    var event0 = exports.event; // Events can be reentrant (e.g., focus).
    exports.event = event1;
    try {
      listener.call(this, this.__data__, index, group);
    } finally {
      exports.event = event0;
    }
  };
}

function parseTypenames$1(typenames) {
  return typenames.trim().split(/^|\s+/).map(function(t) {
    var name = "", i = t.indexOf(".");
    if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
    return {type: t, name: name};
  });
}

function onRemove(typename) {
  return function() {
    var on = this.__on;
    if (!on) return;
    for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {
      if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {
        this.removeEventListener(o.type, o.listener, o.capture);
      } else {
        on[++i] = o;
      }
    }
    if (++i) on.length = i;
    else delete this.__on;
  };
}

function onAdd(typename, value, capture) {
  var wrap = filterEvents.hasOwnProperty(typename.type) ? filterContextListener : contextListener;
  return function(d, i, group) {
    var on = this.__on, o, listener = wrap(value, i, group);
    if (on) for (var j = 0, m = on.length; j < m; ++j) {
      if ((o = on[j]).type === typename.type && o.name === typename.name) {
        this.removeEventListener(o.type, o.listener, o.capture);
        this.addEventListener(o.type, o.listener = listener, o.capture = capture);
        o.value = value;
        return;
      }
    }
    this.addEventListener(typename.type, listener, capture);
    o = {type: typename.type, name: typename.name, value: value, listener: listener, capture: capture};
    if (!on) this.__on = [o];
    else on.push(o);
  };
}

var selection_on = function(typename, value, capture) {
  var typenames = parseTypenames$1(typename + ""), i, n = typenames.length, t;

  if (arguments.length < 2) {
    var on = this.node().__on;
    if (on) for (var j = 0, m = on.length, o; j < m; ++j) {
      for (i = 0, o = on[j]; i < n; ++i) {
        if ((t = typenames[i]).type === o.type && t.name === o.name) {
          return o.value;
        }
      }
    }
    return;
  }

  on = value ? onAdd : onRemove;
  if (capture == null) capture = false;
  for (i = 0; i < n; ++i) this.each(on(typenames[i], value, capture));
  return this;
};

function customEvent(event1, listener, that, args) {
  var event0 = exports.event;
  event1.sourceEvent = exports.event;
  exports.event = event1;
  try {
    return listener.apply(that, args);
  } finally {
    exports.event = event0;
  }
}

var sourceEvent = function() {
  var current = exports.event, source;
  while (source = current.sourceEvent) current = source;
  return current;
};

var point = function(node, event) {
  var svg = node.ownerSVGElement || node;

  if (svg.createSVGPoint) {
    var point = svg.createSVGPoint();
    point.x = event.clientX, point.y = event.clientY;
    point = point.matrixTransform(node.getScreenCTM().inverse());
    return [point.x, point.y];
  }

  var rect = node.getBoundingClientRect();
  return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];
};

var mouse = function(node) {
  var event = sourceEvent();
  if (event.changedTouches) event = event.changedTouches[0];
  return point(node, event);
};

function none() {}

var selector = function(selector) {
  return selector == null ? none : function() {
    return this.querySelector(selector);
  };
};

var selection_select = function(select) {
  if (typeof select !== "function") select = selector(select);

  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
      if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
        if ("__data__" in node) subnode.__data__ = node.__data__;
        subgroup[i] = subnode;
      }
    }
  }

  return new Selection(subgroups, this._parents);
};

function empty$1() {
  return [];
}

var selectorAll = function(selector) {
  return selector == null ? empty$1 : function() {
    return this.querySelectorAll(selector);
  };
};

var selection_selectAll = function(select) {
  if (typeof select !== "function") select = selectorAll(select);

  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        subgroups.push(select.call(node, node.__data__, i, group));
        parents.push(node);
      }
    }
  }

  return new Selection(subgroups, parents);
};

var selection_filter = function(match) {
  if (typeof match !== "function") match = matcher$1(match);

  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
        subgroup.push(node);
      }
    }
  }

  return new Selection(subgroups, this._parents);
};

var sparse = function(update) {
  return new Array(update.length);
};

var selection_enter = function() {
  return new Selection(this._enter || this._groups.map(sparse), this._parents);
};

function EnterNode(parent, datum) {
  this.ownerDocument = parent.ownerDocument;
  this.namespaceURI = parent.namespaceURI;
  this._next = null;
  this._parent = parent;
  this.__data__ = datum;
}

EnterNode.prototype = {
  constructor: EnterNode,
  appendChild: function(child) { return this._parent.insertBefore(child, this._next); },
  insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },
  querySelector: function(selector) { return this._parent.querySelector(selector); },
  querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }
};

var constant$1 = function(x) {
  return function() {
    return x;
  };
};

var keyPrefix = "$"; // Protect against keys like “__proto__”.

function bindIndex(parent, group, enter, update, exit, data) {
  var i = 0,
      node,
      groupLength = group.length,
      dataLength = data.length;

  // Put any non-null nodes that fit into update.
  // Put any null nodes into enter.
  // Put any remaining data into enter.
  for (; i < dataLength; ++i) {
    if (node = group[i]) {
      node.__data__ = data[i];
      update[i] = node;
    } else {
      enter[i] = new EnterNode(parent, data[i]);
    }
  }

  // Put any non-null nodes that don’t fit into exit.
  for (; i < groupLength; ++i) {
    if (node = group[i]) {
      exit[i] = node;
    }
  }
}

function bindKey(parent, group, enter, update, exit, data, key) {
  var i,
      node,
      nodeByKeyValue = {},
      groupLength = group.length,
      dataLength = data.length,
      keyValues = new Array(groupLength),
      keyValue;

  // Compute the key for each node.
  // If multiple nodes have the same key, the duplicates are added to exit.
  for (i = 0; i < groupLength; ++i) {
    if (node = group[i]) {
      keyValues[i] = keyValue = keyPrefix + key.call(node, node.__data__, i, group);
      if (keyValue in nodeByKeyValue) {
        exit[i] = node;
      } else {
        nodeByKeyValue[keyValue] = node;
      }
    }
  }

  // Compute the key for each datum.
  // If there a node associated with this key, join and add it to update.
  // If there is not (or the key is a duplicate), add it to enter.
  for (i = 0; i < dataLength; ++i) {
    keyValue = keyPrefix + key.call(parent, data[i], i, data);
    if (node = nodeByKeyValue[keyValue]) {
      update[i] = node;
      node.__data__ = data[i];
      nodeByKeyValue[keyValue] = null;
    } else {
      enter[i] = new EnterNode(parent, data[i]);
    }
  }

  // Add any remaining nodes that were not bound to data to exit.
  for (i = 0; i < groupLength; ++i) {
    if ((node = group[i]) && (nodeByKeyValue[keyValues[i]] === node)) {
      exit[i] = node;
    }
  }
}

var selection_data = function(value, key) {
  if (!value) {
    data = new Array(this.size()), j = -1;
    this.each(function(d) { data[++j] = d; });
    return data;
  }

  var bind = key ? bindKey : bindIndex,
      parents = this._parents,
      groups = this._groups;

  if (typeof value !== "function") value = constant$1(value);

  for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {
    var parent = parents[j],
        group = groups[j],
        groupLength = group.length,
        data = value.call(parent, parent && parent.__data__, j, parents),
        dataLength = data.length,
        enterGroup = enter[j] = new Array(dataLength),
        updateGroup = update[j] = new Array(dataLength),
        exitGroup = exit[j] = new Array(groupLength);

    bind(parent, group, enterGroup, updateGroup, exitGroup, data, key);

    // Now connect the enter nodes to their following update node, such that
    // appendChild can insert the materialized enter node before this node,
    // rather than at the end of the parent node.
    for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {
      if (previous = enterGroup[i0]) {
        if (i0 >= i1) i1 = i0 + 1;
        while (!(next = updateGroup[i1]) && ++i1 < dataLength);
        previous._next = next || null;
      }
    }
  }

  update = new Selection(update, parents);
  update._enter = enter;
  update._exit = exit;
  return update;
};

var selection_exit = function() {
  return new Selection(this._exit || this._groups.map(sparse), this._parents);
};

var selection_merge = function(selection) {

  for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
      if (node = group0[i] || group1[i]) {
        merge[i] = node;
      }
    }
  }

  for (; j < m0; ++j) {
    merges[j] = groups0[j];
  }

  return new Selection(merges, this._parents);
};

var selection_order = function() {

  for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {
    for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
      if (node = group[i]) {
        if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next);
        next = node;
      }
    }
  }

  return this;
};

var selection_sort = function(compare) {
  if (!compare) compare = ascending$1;

  function compareNode(a, b) {
    return a && b ? compare(a.__data__, b.__data__) : !a - !b;
  }

  for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        sortgroup[i] = node;
      }
    }
    sortgroup.sort(compareNode);
  }

  return new Selection(sortgroups, this._parents).order();
};

function ascending$1(a, b) {
  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
}

var selection_call = function() {
  var callback = arguments[0];
  arguments[0] = this;
  callback.apply(null, arguments);
  return this;
};

var selection_nodes = function() {
  var nodes = new Array(this.size()), i = -1;
  this.each(function() { nodes[++i] = this; });
  return nodes;
};

var selection_node = function() {

  for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
    for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {
      var node = group[i];
      if (node) return node;
    }
  }

  return null;
};

var selection_size = function() {
  var size = 0;
  this.each(function() { ++size; });
  return size;
};

var selection_empty = function() {
  return !this.node();
};

var selection_each = function(callback) {

  for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
    for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {
      if (node = group[i]) callback.call(node, node.__data__, i, group);
    }
  }

  return this;
};

function attrRemove(name) {
  return function() {
    this.removeAttribute(name);
  };
}

function attrRemoveNS(fullname) {
  return function() {
    this.removeAttributeNS(fullname.space, fullname.local);
  };
}

function attrConstant(name, value) {
  return function() {
    this.setAttribute(name, value);
  };
}

function attrConstantNS(fullname, value) {
  return function() {
    this.setAttributeNS(fullname.space, fullname.local, value);
  };
}

function attrFunction(name, value) {
  return function() {
    var v = value.apply(this, arguments);
    if (v == null) this.removeAttribute(name);
    else this.setAttribute(name, v);
  };
}

function attrFunctionNS(fullname, value) {
  return function() {
    var v = value.apply(this, arguments);
    if (v == null) this.removeAttributeNS(fullname.space, fullname.local);
    else this.setAttributeNS(fullname.space, fullname.local, v);
  };
}

var selection_attr = function(name, value) {
  var fullname = namespace(name);

  if (arguments.length < 2) {
    var node = this.node();
    return fullname.local
        ? node.getAttributeNS(fullname.space, fullname.local)
        : node.getAttribute(fullname);
  }

  return this.each((value == null
      ? (fullname.local ? attrRemoveNS : attrRemove) : (typeof value === "function"
      ? (fullname.local ? attrFunctionNS : attrFunction)
      : (fullname.local ? attrConstantNS : attrConstant)))(fullname, value));
};

var defaultView = function(node) {
  return (node.ownerDocument && node.ownerDocument.defaultView) // node is a Node
      || (node.document && node) // node is a Window
      || node.defaultView; // node is a Document
};

function styleRemove(name) {
  return function() {
    this.style.removeProperty(name);
  };
}

function styleConstant(name, value, priority) {
  return function() {
    this.style.setProperty(name, value, priority);
  };
}

function styleFunction(name, value, priority) {
  return function() {
    var v = value.apply(this, arguments);
    if (v == null) this.style.removeProperty(name);
    else this.style.setProperty(name, v, priority);
  };
}

var selection_style = function(name, value, priority) {
  return arguments.length > 1
      ? this.each((value == null
            ? styleRemove : typeof value === "function"
            ? styleFunction
            : styleConstant)(name, value, priority == null ? "" : priority))
      : styleValue(this.node(), name);
};

function styleValue(node, name) {
  return node.style.getPropertyValue(name)
      || defaultView(node).getComputedStyle(node, null).getPropertyValue(name);
}

function propertyRemove(name) {
  return function() {
    delete this[name];
  };
}

function propertyConstant(name, value) {
  return function() {
    this[name] = value;
  };
}

function propertyFunction(name, value) {
  return function() {
    var v = value.apply(this, arguments);
    if (v == null) delete this[name];
    else this[name] = v;
  };
}

var selection_property = function(name, value) {
  return arguments.length > 1
      ? this.each((value == null
          ? propertyRemove : typeof value === "function"
          ? propertyFunction
          : propertyConstant)(name, value))
      : this.node()[name];
};

function classArray(string) {
  return string.trim().split(/^|\s+/);
}

function classList(node) {
  return node.classList || new ClassList(node);
}

function ClassList(node) {
  this._node = node;
  this._names = classArray(node.getAttribute("class") || "");
}

ClassList.prototype = {
  add: function(name) {
    var i = this._names.indexOf(name);
    if (i < 0) {
      this._names.push(name);
      this._node.setAttribute("class", this._names.join(" "));
    }
  },
  remove: function(name) {
    var i = this._names.indexOf(name);
    if (i >= 0) {
      this._names.splice(i, 1);
      this._node.setAttribute("class", this._names.join(" "));
    }
  },
  contains: function(name) {
    return this._names.indexOf(name) >= 0;
  }
};

function classedAdd(node, names) {
  var list = classList(node), i = -1, n = names.length;
  while (++i < n) list.add(names[i]);
}

function classedRemove(node, names) {
  var list = classList(node), i = -1, n = names.length;
  while (++i < n) list.remove(names[i]);
}

function classedTrue(names) {
  return function() {
    classedAdd(this, names);
  };
}

function classedFalse(names) {
  return function() {
    classedRemove(this, names);
  };
}

function classedFunction(names, value) {
  return function() {
    (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);
  };
}

var selection_classed = function(name, value) {
  var names = classArray(name + "");

  if (arguments.length < 2) {
    var list = classList(this.node()), i = -1, n = names.length;
    while (++i < n) if (!list.contains(names[i])) return false;
    return true;
  }

  return this.each((typeof value === "function"
      ? classedFunction : value
      ? classedTrue
      : classedFalse)(names, value));
};

function textRemove() {
  this.textContent = "";
}

function textConstant(value) {
  return function() {
    this.textContent = value;
  };
}

function textFunction(value) {
  return function() {
    var v = value.apply(this, arguments);
    this.textContent = v == null ? "" : v;
  };
}

var selection_text = function(value) {
  return arguments.length
      ? this.each(value == null
          ? textRemove : (typeof value === "function"
          ? textFunction
          : textConstant)(value))
      : this.node().textContent;
};

function htmlRemove() {
  this.innerHTML = "";
}

function htmlConstant(value) {
  return function() {
    this.innerHTML = value;
  };
}

function htmlFunction(value) {
  return function() {
    var v = value.apply(this, arguments);
    this.innerHTML = v == null ? "" : v;
  };
}

var selection_html = function(value) {
  return arguments.length
      ? this.each(value == null
          ? htmlRemove : (typeof value === "function"
          ? htmlFunction
          : htmlConstant)(value))
      : this.node().innerHTML;
};

function raise() {
  if (this.nextSibling) this.parentNode.appendChild(this);
}

var selection_raise = function() {
  return this.each(raise);
};

function lower() {
  if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);
}

var selection_lower = function() {
  return this.each(lower);
};

var selection_append = function(name) {
  var create = typeof name === "function" ? name : creator(name);
  return this.select(function() {
    return this.appendChild(create.apply(this, arguments));
  });
};

function constantNull() {
  return null;
}

var selection_insert = function(name, before) {
  var create = typeof name === "function" ? name : creator(name),
      select = before == null ? constantNull : typeof before === "function" ? before : selector(before);
  return this.select(function() {
    return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);
  });
};

function remove() {
  var parent = this.parentNode;
  if (parent) parent.removeChild(this);
}

var selection_remove = function() {
  return this.each(remove);
};

var selection_datum = function(value) {
  return arguments.length
      ? this.property("__data__", value)
      : this.node().__data__;
};

function dispatchEvent(node, type, params) {
  var window = defaultView(node),
      event = window.CustomEvent;

  if (typeof event === "function") {
    event = new event(type, params);
  } else {
    event = window.document.createEvent("Event");
    if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;
    else event.initEvent(type, false, false);
  }

  node.dispatchEvent(event);
}

function dispatchConstant(type, params) {
  return function() {
    return dispatchEvent(this, type, params);
  };
}

function dispatchFunction(type, params) {
  return function() {
    return dispatchEvent(this, type, params.apply(this, arguments));
  };
}

var selection_dispatch = function(type, params) {
  return this.each((typeof params === "function"
      ? dispatchFunction
      : dispatchConstant)(type, params));
};

var root = [null];

function Selection(groups, parents) {
  this._groups = groups;
  this._parents = parents;
}

function selection() {
  return new Selection([[document.documentElement]], root);
}

Selection.prototype = selection.prototype = {
  constructor: Selection,
  select: selection_select,
  selectAll: selection_selectAll,
  filter: selection_filter,
  data: selection_data,
  enter: selection_enter,
  exit: selection_exit,
  merge: selection_merge,
  order: selection_order,
  sort: selection_sort,
  call: selection_call,
  nodes: selection_nodes,
  node: selection_node,
  size: selection_size,
  empty: selection_empty,
  each: selection_each,
  attr: selection_attr,
  style: selection_style,
  property: selection_property,
  classed: selection_classed,
  text: selection_text,
  html: selection_html,
  raise: selection_raise,
  lower: selection_lower,
  append: selection_append,
  insert: selection_insert,
  remove: selection_remove,
  datum: selection_datum,
  on: selection_on,
  dispatch: selection_dispatch
};

var select = function(selector) {
  return typeof selector === "string"
      ? new Selection([[document.querySelector(selector)]], [document.documentElement])
      : new Selection([[selector]], root);
};

var selectAll = function(selector) {
  return typeof selector === "string"
      ? new Selection([document.querySelectorAll(selector)], [document.documentElement])
      : new Selection([selector == null ? [] : selector], root);
};

var touch = function(node, touches, identifier) {
  if (arguments.length < 3) identifier = touches, touches = sourceEvent().changedTouches;

  for (var i = 0, n = touches ? touches.length : 0, touch; i < n; ++i) {
    if ((touch = touches[i]).identifier === identifier) {
      return point(node, touch);
    }
  }

  return null;
};

var touches = function(node, touches) {
  if (touches == null) touches = sourceEvent().touches;

  for (var i = 0, n = touches ? touches.length : 0, points = new Array(n); i < n; ++i) {
    points[i] = point(node, touches[i]);
  }

  return points;
};

function nopropagation() {
  exports.event.stopImmediatePropagation();
}

var noevent = function() {
  exports.event.preventDefault();
  exports.event.stopImmediatePropagation();
};

var dragDisable = function(view) {
  var root = view.document.documentElement,
      selection$$1 = select(view).on("dragstart.drag", noevent, true);
  if ("onselectstart" in root) {
    selection$$1.on("selectstart.drag", noevent, true);
  } else {
    root.__noselect = root.style.MozUserSelect;
    root.style.MozUserSelect = "none";
  }
};

function yesdrag(view, noclick) {
  var root = view.document.documentElement,
      selection$$1 = select(view).on("dragstart.drag", null);
  if (noclick) {
    selection$$1.on("click.drag", noevent, true);
    setTimeout(function() { selection$$1.on("click.drag", null); }, 0);
  }
  if ("onselectstart" in root) {
    selection$$1.on("selectstart.drag", null);
  } else {
    root.style.MozUserSelect = root.__noselect;
    delete root.__noselect;
  }
}

var constant$2 = function(x) {
  return function() {
    return x;
  };
};

function DragEvent(target, type, subject, id, active, x, y, dx, dy, dispatch) {
  this.target = target;
  this.type = type;
  this.subject = subject;
  this.identifier = id;
  this.active = active;
  this.x = x;
  this.y = y;
  this.dx = dx;
  this.dy = dy;
  this._ = dispatch;
}

DragEvent.prototype.on = function() {
  var value = this._.on.apply(this._, arguments);
  return value === this._ ? this : value;
};

// Ignore right-click, since that should open the context menu.
function defaultFilter$1() {
  return !exports.event.button;
}

function defaultContainer() {
  return this.parentNode;
}

function defaultSubject(d) {
  return d == null ? {x: exports.event.x, y: exports.event.y} : d;
}

function touchable() {
  return "ontouchstart" in this;
}

var drag = function() {
  var filter = defaultFilter$1,
      container = defaultContainer,
      subject = defaultSubject,
      gestures = {},
      listeners = dispatch("start", "drag", "end"),
      active = 0,
      mousedownx,
      mousedowny,
      mousemoving,
      touchending,
      clickDistance2 = 0;

  function drag(selection$$1) {
    selection$$1
        .on("mousedown.drag", mousedowned)
      .filter(touchable)
        .on("touchstart.drag", touchstarted)
        .on("touchmove.drag", touchmoved)
        .on("touchend.drag touchcancel.drag", touchended)
        .style("touch-action", "none")
        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
  }

  function mousedowned() {
    if (touchending || !filter.apply(this, arguments)) return;
    var gesture = beforestart("mouse", container.apply(this, arguments), mouse, this, arguments);
    if (!gesture) return;
    select(exports.event.view).on("mousemove.drag", mousemoved, true).on("mouseup.drag", mouseupped, true);
    dragDisable(exports.event.view);
    nopropagation();
    mousemoving = false;
    mousedownx = exports.event.clientX;
    mousedowny = exports.event.clientY;
    gesture("start");
  }

  function mousemoved() {
    noevent();
    if (!mousemoving) {
      var dx = exports.event.clientX - mousedownx, dy = exports.event.clientY - mousedowny;
      mousemoving = dx * dx + dy * dy > clickDistance2;
    }
    gestures.mouse("drag");
  }

  function mouseupped() {
    select(exports.event.view).on("mousemove.drag mouseup.drag", null);
    yesdrag(exports.event.view, mousemoving);
    noevent();
    gestures.mouse("end");
  }

  function touchstarted() {
    if (!filter.apply(this, arguments)) return;
    var touches$$1 = exports.event.changedTouches,
        c = container.apply(this, arguments),
        n = touches$$1.length, i, gesture;

    for (i = 0; i < n; ++i) {
      if (gesture = beforestart(touches$$1[i].identifier, c, touch, this, arguments)) {
        nopropagation();
        gesture("start");
      }
    }
  }

  function touchmoved() {
    var touches$$1 = exports.event.changedTouches,
        n = touches$$1.length, i, gesture;

    for (i = 0; i < n; ++i) {
      if (gesture = gestures[touches$$1[i].identifier]) {
        noevent();
        gesture("drag");
      }
    }
  }

  function touchended() {
    var touches$$1 = exports.event.changedTouches,
        n = touches$$1.length, i, gesture;

    if (touchending) clearTimeout(touchending);
    touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
    for (i = 0; i < n; ++i) {
      if (gesture = gestures[touches$$1[i].identifier]) {
        nopropagation();
        gesture("end");
      }
    }
  }

  function beforestart(id, container, point, that, args) {
    var p = point(container, id), s, dx, dy,
        sublisteners = listeners.copy();

    if (!customEvent(new DragEvent(drag, "beforestart", s, id, active, p[0], p[1], 0, 0, sublisteners), function() {
      if ((exports.event.subject = s = subject.apply(that, args)) == null) return false;
      dx = s.x - p[0] || 0;
      dy = s.y - p[1] || 0;
      return true;
    })) return;

    return function gesture(type) {
      var p0 = p, n;
      switch (type) {
        case "start": gestures[id] = gesture, n = active++; break;
        case "end": delete gestures[id], --active; // nobreak
        case "drag": p = point(container, id), n = active; break;
      }
      customEvent(new DragEvent(drag, type, s, id, n, p[0] + dx, p[1] + dy, p[0] - p0[0], p[1] - p0[1], sublisteners), sublisteners.apply, sublisteners, [type, that, args]);
    };
  }

  drag.filter = function(_) {
    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$2(!!_), drag) : filter;
  };

  drag.container = function(_) {
    return arguments.length ? (container = typeof _ === "function" ? _ : constant$2(_), drag) : container;
  };

  drag.subject = function(_) {
    return arguments.length ? (subject = typeof _ === "function" ? _ : constant$2(_), drag) : subject;
  };

  drag.on = function() {
    var value = listeners.on.apply(listeners, arguments);
    return value === listeners ? drag : value;
  };

  drag.clickDistance = function(_) {
    return arguments.length ? (clickDistance2 = (_ = +_) * _, drag) : Math.sqrt(clickDistance2);
  };

  return drag;
};

var define = function(constructor, factory, prototype) {
  constructor.prototype = factory.prototype = prototype;
  prototype.constructor = constructor;
};

function extend(parent, definition) {
  var prototype = Object.create(parent.prototype);
  for (var key in definition) prototype[key] = definition[key];
  return prototype;
}

function Color() {}

var darker = 0.7;
var brighter = 1 / darker;

var reI = "\\s*([+-]?\\d+)\\s*";
var reN = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\s*";
var reP = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)%\\s*";
var reHex3 = /^#([0-9a-f]{3})$/;
var reHex6 = /^#([0-9a-f]{6})$/;
var reRgbInteger = new RegExp("^rgb\\(" + [reI, reI, reI] + "\\)$");
var reRgbPercent = new RegExp("^rgb\\(" + [reP, reP, reP] + "\\)$");
var reRgbaInteger = new RegExp("^rgba\\(" + [reI, reI, reI, reN] + "\\)$");
var reRgbaPercent = new RegExp("^rgba\\(" + [reP, reP, reP, reN] + "\\)$");
var reHslPercent = new RegExp("^hsl\\(" + [reN, reP, reP] + "\\)$");
var reHslaPercent = new RegExp("^hsla\\(" + [reN, reP, reP, reN] + "\\)$");

var named = {
  aliceblue: 0xf0f8ff,
  antiquewhite: 0xfaebd7,
  aqua: 0x00ffff,
  aquamarine: 0x7fffd4,
  azure: 0xf0ffff,
  beige: 0xf5f5dc,
  bisque: 0xffe4c4,
  black: 0x000000,
  blanchedalmond: 0xffebcd,
  blue: 0x0000ff,
  blueviolet: 0x8a2be2,
  brown: 0xa52a2a,
  burlywood: 0xdeb887,
  cadetblue: 0x5f9ea0,
  chartreuse: 0x7fff00,
  chocolate: 0xd2691e,
  coral: 0xff7f50,
  cornflowerblue: 0x6495ed,
  cornsilk: 0xfff8dc,
  crimson: 0xdc143c,
  cyan: 0x00ffff,
  darkblue: 0x00008b,
  darkcyan: 0x008b8b,
  darkgoldenrod: 0xb8860b,
  darkgray: 0xa9a9a9,
  darkgreen: 0x006400,
  darkgrey: 0xa9a9a9,
  darkkhaki: 0xbdb76b,
  darkmagenta: 0x8b008b,
  darkolivegreen: 0x556b2f,
  darkorange: 0xff8c00,
  darkorchid: 0x9932cc,
  darkred: 0x8b0000,
  darksalmon: 0xe9967a,
  darkseagreen: 0x8fbc8f,
  darkslateblue: 0x483d8b,
  darkslategray: 0x2f4f4f,
  darkslategrey: 0x2f4f4f,
  darkturquoise: 0x00ced1,
  darkviolet: 0x9400d3,
  deeppink: 0xff1493,
  deepskyblue: 0x00bfff,
  dimgray: 0x696969,
  dimgrey: 0x696969,
  dodgerblue: 0x1e90ff,
  firebrick: 0xb22222,
  floralwhite: 0xfffaf0,
  forestgreen: 0x228b22,
  fuchsia: 0xff00ff,
  gainsboro: 0xdcdcdc,
  ghostwhite: 0xf8f8ff,
  gold: 0xffd700,
  goldenrod: 0xdaa520,
  gray: 0x808080,
  green: 0x008000,
  greenyellow: 0xadff2f,
  grey: 0x808080,
  honeydew: 0xf0fff0,
  hotpink: 0xff69b4,
  indianred: 0xcd5c5c,
  indigo: 0x4b0082,
  ivory: 0xfffff0,
  khaki: 0xf0e68c,
  lavender: 0xe6e6fa,
  lavenderblush: 0xfff0f5,
  lawngreen: 0x7cfc00,
  lemonchiffon: 0xfffacd,
  lightblue: 0xadd8e6,
  lightcoral: 0xf08080,
  lightcyan: 0xe0ffff,
  lightgoldenrodyellow: 0xfafad2,
  lightgray: 0xd3d3d3,
  lightgreen: 0x90ee90,
  lightgrey: 0xd3d3d3,
  lightpink: 0xffb6c1,
  lightsalmon: 0xffa07a,
  lightseagreen: 0x20b2aa,
  lightskyblue: 0x87cefa,
  lightslategray: 0x778899,
  lightslategrey: 0x778899,
  lightsteelblue: 0xb0c4de,
  lightyellow: 0xffffe0,
  lime: 0x00ff00,
  limegreen: 0x32cd32,
  linen: 0xfaf0e6,
  magenta: 0xff00ff,
  maroon: 0x800000,
  mediumaquamarine: 0x66cdaa,
  mediumblue: 0x0000cd,
  mediumorchid: 0xba55d3,
  mediumpurple: 0x9370db,
  mediumseagreen: 0x3cb371,
  mediumslateblue: 0x7b68ee,
  mediumspringgreen: 0x00fa9a,
  mediumturquoise: 0x48d1cc,
  mediumvioletred: 0xc71585,
  midnightblue: 0x191970,
  mintcream: 0xf5fffa,
  mistyrose: 0xffe4e1,
  moccasin: 0xffe4b5,
  navajowhite: 0xffdead,
  navy: 0x000080,
  oldlace: 0xfdf5e6,
  olive: 0x808000,
  olivedrab: 0x6b8e23,
  orange: 0xffa500,
  orangered: 0xff4500,
  orchid: 0xda70d6,
  palegoldenrod: 0xeee8aa,
  palegreen: 0x98fb98,
  paleturquoise: 0xafeeee,
  palevioletred: 0xdb7093,
  papayawhip: 0xffefd5,
  peachpuff: 0xffdab9,
  peru: 0xcd853f,
  pink: 0xffc0cb,
  plum: 0xdda0dd,
  powderblue: 0xb0e0e6,
  purple: 0x800080,
  rebeccapurple: 0x663399,
  red: 0xff0000,
  rosybrown: 0xbc8f8f,
  royalblue: 0x4169e1,
  saddlebrown: 0x8b4513,
  salmon: 0xfa8072,
  sandybrown: 0xf4a460,
  seagreen: 0x2e8b57,
  seashell: 0xfff5ee,
  sienna: 0xa0522d,
  silver: 0xc0c0c0,
  skyblue: 0x87ceeb,
  slateblue: 0x6a5acd,
  slategray: 0x708090,
  slategrey: 0x708090,
  snow: 0xfffafa,
  springgreen: 0x00ff7f,
  steelblue: 0x4682b4,
  tan: 0xd2b48c,
  teal: 0x008080,
  thistle: 0xd8bfd8,
  tomato: 0xff6347,
  turquoise: 0x40e0d0,
  violet: 0xee82ee,
  wheat: 0xf5deb3,
  white: 0xffffff,
  whitesmoke: 0xf5f5f5,
  yellow: 0xffff00,
  yellowgreen: 0x9acd32
};

define(Color, color, {
  displayable: function() {
    return this.rgb().displayable();
  },
  toString: function() {
    return this.rgb() + "";
  }
});

function color(format) {
  var m;
  format = (format + "").trim().toLowerCase();
  return (m = reHex3.exec(format)) ? (m = parseInt(m[1], 16), new Rgb((m >> 8 & 0xf) | (m >> 4 & 0x0f0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1)) // #f00
      : (m = reHex6.exec(format)) ? rgbn(parseInt(m[1], 16)) // #ff0000
      : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
      : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
      : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
      : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
      : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
      : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
      : named.hasOwnProperty(format) ? rgbn(named[format])
      : format === "transparent" ? new Rgb(NaN, NaN, NaN, 0)
      : null;
}

function rgbn(n) {
  return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
}

function rgba(r, g, b, a) {
  if (a <= 0) r = g = b = NaN;
  return new Rgb(r, g, b, a);
}

function rgbConvert(o) {
  if (!(o instanceof Color)) o = color(o);
  if (!o) return new Rgb;
  o = o.rgb();
  return new Rgb(o.r, o.g, o.b, o.opacity);
}

function rgb(r, g, b, opacity) {
  return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
}

function Rgb(r, g, b, opacity) {
  this.r = +r;
  this.g = +g;
  this.b = +b;
  this.opacity = +opacity;
}

define(Rgb, rgb, extend(Color, {
  brighter: function(k) {
    k = k == null ? brighter : Math.pow(brighter, k);
    return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
  },
  darker: function(k) {
    k = k == null ? darker : Math.pow(darker, k);
    return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
  },
  rgb: function() {
    return this;
  },
  displayable: function() {
    return (0 <= this.r && this.r <= 255)
        && (0 <= this.g && this.g <= 255)
        && (0 <= this.b && this.b <= 255)
        && (0 <= this.opacity && this.opacity <= 1);
  },
  toString: function() {
    var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
    return (a === 1 ? "rgb(" : "rgba(")
        + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", "
        + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", "
        + Math.max(0, Math.min(255, Math.round(this.b) || 0))
        + (a === 1 ? ")" : ", " + a + ")");
  }
}));

function hsla(h, s, l, a) {
  if (a <= 0) h = s = l = NaN;
  else if (l <= 0 || l >= 1) h = s = NaN;
  else if (s <= 0) h = NaN;
  return new Hsl(h, s, l, a);
}

function hslConvert(o) {
  if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
  if (!(o instanceof Color)) o = color(o);
  if (!o) return new Hsl;
  if (o instanceof Hsl) return o;
  o = o.rgb();
  var r = o.r / 255,
      g = o.g / 255,
      b = o.b / 255,
      min = Math.min(r, g, b),
      max = Math.max(r, g, b),
      h = NaN,
      s = max - min,
      l = (max + min) / 2;
  if (s) {
    if (r === max) h = (g - b) / s + (g < b) * 6;
    else if (g === max) h = (b - r) / s + 2;
    else h = (r - g) / s + 4;
    s /= l < 0.5 ? max + min : 2 - max - min;
    h *= 60;
  } else {
    s = l > 0 && l < 1 ? 0 : h;
  }
  return new Hsl(h, s, l, o.opacity);
}

function hsl(h, s, l, opacity) {
  return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
}

function Hsl(h, s, l, opacity) {
  this.h = +h;
  this.s = +s;
  this.l = +l;
  this.opacity = +opacity;
}

define(Hsl, hsl, extend(Color, {
  brighter: function(k) {
    k = k == null ? brighter : Math.pow(brighter, k);
    return new Hsl(this.h, this.s, this.l * k, this.opacity);
  },
  darker: function(k) {
    k = k == null ? darker : Math.pow(darker, k);
    return new Hsl(this.h, this.s, this.l * k, this.opacity);
  },
  rgb: function() {
    var h = this.h % 360 + (this.h < 0) * 360,
        s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
        l = this.l,
        m2 = l + (l < 0.5 ? l : 1 - l) * s,
        m1 = 2 * l - m2;
    return new Rgb(
      hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),
      hsl2rgb(h, m1, m2),
      hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),
      this.opacity
    );
  },
  displayable: function() {
    return (0 <= this.s && this.s <= 1 || isNaN(this.s))
        && (0 <= this.l && this.l <= 1)
        && (0 <= this.opacity && this.opacity <= 1);
  }
}));

/* From FvD 13.37, CSS Color Module Level 3 */
function hsl2rgb(h, m1, m2) {
  return (h < 60 ? m1 + (m2 - m1) * h / 60
      : h < 180 ? m2
      : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60
      : m1) * 255;
}

var deg2rad = Math.PI / 180;
var rad2deg = 180 / Math.PI;

var Kn = 18;
var Xn = 0.950470;
var Yn = 1;
var Zn = 1.088830;
var t0 = 4 / 29;
var t1 = 6 / 29;
var t2 = 3 * t1 * t1;
var t3 = t1 * t1 * t1;

function labConvert(o) {
  if (o instanceof Lab) return new Lab(o.l, o.a, o.b, o.opacity);
  if (o instanceof Hcl) {
    var h = o.h * deg2rad;
    return new Lab(o.l, Math.cos(h) * o.c, Math.sin(h) * o.c, o.opacity);
  }
  if (!(o instanceof Rgb)) o = rgbConvert(o);
  var b = rgb2xyz(o.r),
      a = rgb2xyz(o.g),
      l = rgb2xyz(o.b),
      x = xyz2lab((0.4124564 * b + 0.3575761 * a + 0.1804375 * l) / Xn),
      y = xyz2lab((0.2126729 * b + 0.7151522 * a + 0.0721750 * l) / Yn),
      z = xyz2lab((0.0193339 * b + 0.1191920 * a + 0.9503041 * l) / Zn);
  return new Lab(116 * y - 16, 500 * (x - y), 200 * (y - z), o.opacity);
}

function lab(l, a, b, opacity) {
  return arguments.length === 1 ? labConvert(l) : new Lab(l, a, b, opacity == null ? 1 : opacity);
}

function Lab(l, a, b, opacity) {
  this.l = +l;
  this.a = +a;
  this.b = +b;
  this.opacity = +opacity;
}

define(Lab, lab, extend(Color, {
  brighter: function(k) {
    return new Lab(this.l + Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
  },
  darker: function(k) {
    return new Lab(this.l - Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
  },
  rgb: function() {
    var y = (this.l + 16) / 116,
        x = isNaN(this.a) ? y : y + this.a / 500,
        z = isNaN(this.b) ? y : y - this.b / 200;
    y = Yn * lab2xyz(y);
    x = Xn * lab2xyz(x);
    z = Zn * lab2xyz(z);
    return new Rgb(
      xyz2rgb( 3.2404542 * x - 1.5371385 * y - 0.4985314 * z), // D65 -> sRGB
      xyz2rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z),
      xyz2rgb( 0.0556434 * x - 0.2040259 * y + 1.0572252 * z),
      this.opacity
    );
  }
}));

function xyz2lab(t) {
  return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;
}

function lab2xyz(t) {
  return t > t1 ? t * t * t : t2 * (t - t0);
}

function xyz2rgb(x) {
  return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);
}

function rgb2xyz(x) {
  return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);
}

function hclConvert(o) {
  if (o instanceof Hcl) return new Hcl(o.h, o.c, o.l, o.opacity);
  if (!(o instanceof Lab)) o = labConvert(o);
  var h = Math.atan2(o.b, o.a) * rad2deg;
  return new Hcl(h < 0 ? h + 360 : h, Math.sqrt(o.a * o.a + o.b * o.b), o.l, o.opacity);
}

function hcl(h, c, l, opacity) {
  return arguments.length === 1 ? hclConvert(h) : new Hcl(h, c, l, opacity == null ? 1 : opacity);
}

function Hcl(h, c, l, opacity) {
  this.h = +h;
  this.c = +c;
  this.l = +l;
  this.opacity = +opacity;
}

define(Hcl, hcl, extend(Color, {
  brighter: function(k) {
    return new Hcl(this.h, this.c, this.l + Kn * (k == null ? 1 : k), this.opacity);
  },
  darker: function(k) {
    return new Hcl(this.h, this.c, this.l - Kn * (k == null ? 1 : k), this.opacity);
  },
  rgb: function() {
    return labConvert(this).rgb();
  }
}));

var A = -0.14861;
var B = +1.78277;
var C = -0.29227;
var D = -0.90649;
var E = +1.97294;
var ED = E * D;
var EB = E * B;
var BC_DA = B * C - D * A;

function cubehelixConvert(o) {
  if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);
  if (!(o instanceof Rgb)) o = rgbConvert(o);
  var r = o.r / 255,
      g = o.g / 255,
      b = o.b / 255,
      l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),
      bl = b - l,
      k = (E * (g - l) - C * bl) / D,
      s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)), // NaN if l=0 or l=1
      h = s ? Math.atan2(k, bl) * rad2deg - 120 : NaN;
  return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);
}

function cubehelix(h, s, l, opacity) {
  return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);
}

function Cubehelix(h, s, l, opacity) {
  this.h = +h;
  this.s = +s;
  this.l = +l;
  this.opacity = +opacity;
}

define(Cubehelix, cubehelix, extend(Color, {
  brighter: function(k) {
    k = k == null ? brighter : Math.pow(brighter, k);
    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
  },
  darker: function(k) {
    k = k == null ? darker : Math.pow(darker, k);
    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
  },
  rgb: function() {
    var h = isNaN(this.h) ? 0 : (this.h + 120) * deg2rad,
        l = +this.l,
        a = isNaN(this.s) ? 0 : this.s * l * (1 - l),
        cosh = Math.cos(h),
        sinh = Math.sin(h);
    return new Rgb(
      255 * (l + a * (A * cosh + B * sinh)),
      255 * (l + a * (C * cosh + D * sinh)),
      255 * (l + a * (E * cosh)),
      this.opacity
    );
  }
}));

function basis(t1, v0, v1, v2, v3) {
  var t2 = t1 * t1, t3 = t2 * t1;
  return ((1 - 3 * t1 + 3 * t2 - t3) * v0
      + (4 - 6 * t2 + 3 * t3) * v1
      + (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2
      + t3 * v3) / 6;
}

var basis$1 = function(values) {
  var n = values.length - 1;
  return function(t) {
    var i = t <= 0 ? (t = 0) : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n),
        v1 = values[i],
        v2 = values[i + 1],
        v0 = i > 0 ? values[i - 1] : 2 * v1 - v2,
        v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
    return basis((t - i / n) * n, v0, v1, v2, v3);
  };
};

var basisClosed = function(values) {
  var n = values.length;
  return function(t) {
    var i = Math.floor(((t %= 1) < 0 ? ++t : t) * n),
        v0 = values[(i + n - 1) % n],
        v1 = values[i % n],
        v2 = values[(i + 1) % n],
        v3 = values[(i + 2) % n];
    return basis((t - i / n) * n, v0, v1, v2, v3);
  };
};

var constant$3 = function(x) {
  return function() {
    return x;
  };
};

function linear(a, d) {
  return function(t) {
    return a + t * d;
  };
}

function exponential(a, b, y) {
  return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {
    return Math.pow(a + t * b, y);
  };
}

function hue(a, b) {
  var d = b - a;
  return d ? linear(a, d > 180 || d < -180 ? d - 360 * Math.round(d / 360) : d) : constant$3(isNaN(a) ? b : a);
}

function gamma(y) {
  return (y = +y) === 1 ? nogamma : function(a, b) {
    return b - a ? exponential(a, b, y) : constant$3(isNaN(a) ? b : a);
  };
}

function nogamma(a, b) {
  var d = b - a;
  return d ? linear(a, d) : constant$3(isNaN(a) ? b : a);
}

var interpolateRgb = ((function rgbGamma(y) {
  var color$$1 = gamma(y);

  function rgb$$1(start, end) {
    var r = color$$1((start = rgb(start)).r, (end = rgb(end)).r),
        g = color$$1(start.g, end.g),
        b = color$$1(start.b, end.b),
        opacity = nogamma(start.opacity, end.opacity);
    return function(t) {
      start.r = r(t);
      start.g = g(t);
      start.b = b(t);
      start.opacity = opacity(t);
      return start + "";
    };
  }

  rgb$$1.gamma = rgbGamma;

  return rgb$$1;
}))(1);

function rgbSpline(spline) {
  return function(colors) {
    var n = colors.length,
        r = new Array(n),
        g = new Array(n),
        b = new Array(n),
        i, color$$1;
    for (i = 0; i < n; ++i) {
      color$$1 = rgb(colors[i]);
      r[i] = color$$1.r || 0;
      g[i] = color$$1.g || 0;
      b[i] = color$$1.b || 0;
    }
    r = spline(r);
    g = spline(g);
    b = spline(b);
    color$$1.opacity = 1;
    return function(t) {
      color$$1.r = r(t);
      color$$1.g = g(t);
      color$$1.b = b(t);
      return color$$1 + "";
    };
  };
}

var rgbBasis = rgbSpline(basis$1);
var rgbBasisClosed = rgbSpline(basisClosed);

var array$1 = function(a, b) {
  var nb = b ? b.length : 0,
      na = a ? Math.min(nb, a.length) : 0,
      x = new Array(nb),
      c = new Array(nb),
      i;

  for (i = 0; i < na; ++i) x[i] = interpolateValue(a[i], b[i]);
  for (; i < nb; ++i) c[i] = b[i];

  return function(t) {
    for (i = 0; i < na; ++i) c[i] = x[i](t);
    return c;
  };
};

var date = function(a, b) {
  var d = new Date;
  return a = +a, b -= a, function(t) {
    return d.setTime(a + b * t), d;
  };
};

var reinterpolate = function(a, b) {
  return a = +a, b -= a, function(t) {
    return a + b * t;
  };
};

var object = function(a, b) {
  var i = {},
      c = {},
      k;

  if (a === null || typeof a !== "object") a = {};
  if (b === null || typeof b !== "object") b = {};

  for (k in b) {
    if (k in a) {
      i[k] = interpolateValue(a[k], b[k]);
    } else {
      c[k] = b[k];
    }
  }

  return function(t) {
    for (k in i) c[k] = i[k](t);
    return c;
  };
};

var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g;
var reB = new RegExp(reA.source, "g");

function zero(b) {
  return function() {
    return b;
  };
}

function one(b) {
  return function(t) {
    return b(t) + "";
  };
}

var interpolateString = function(a, b) {
  var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b
      am, // current match in a
      bm, // current match in b
      bs, // string preceding current number in b, if any
      i = -1, // index in s
      s = [], // string constants and placeholders
      q = []; // number interpolators

  // Coerce inputs to strings.
  a = a + "", b = b + "";

  // Interpolate pairs of numbers in a & b.
  while ((am = reA.exec(a))
      && (bm = reB.exec(b))) {
    if ((bs = bm.index) > bi) { // a string precedes the next number in b
      bs = b.slice(bi, bs);
      if (s[i]) s[i] += bs; // coalesce with previous string
      else s[++i] = bs;
    }
    if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match
      if (s[i]) s[i] += bm; // coalesce with previous string
      else s[++i] = bm;
    } else { // interpolate non-matching numbers
      s[++i] = null;
      q.push({i: i, x: reinterpolate(am, bm)});
    }
    bi = reB.lastIndex;
  }

  // Add remains of b.
  if (bi < b.length) {
    bs = b.slice(bi);
    if (s[i]) s[i] += bs; // coalesce with previous string
    else s[++i] = bs;
  }

  // Special optimization for only a single match.
  // Otherwise, interpolate each of the numbers and rejoin the string.
  return s.length < 2 ? (q[0]
      ? one(q[0].x)
      : zero(b))
      : (b = q.length, function(t) {
          for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);
          return s.join("");
        });
};

var interpolateValue = function(a, b) {
  var t = typeof b, c;
  return b == null || t === "boolean" ? constant$3(b)
      : (t === "number" ? reinterpolate
      : t === "string" ? ((c = color(b)) ? (b = c, interpolateRgb) : interpolateString)
      : b instanceof color ? interpolateRgb
      : b instanceof Date ? date
      : Array.isArray(b) ? array$1
      : typeof b.valueOf !== "function" && typeof b.toString !== "function" || isNaN(b) ? object
      : reinterpolate)(a, b);
};

var interpolateRound = function(a, b) {
  return a = +a, b -= a, function(t) {
    return Math.round(a + b * t);
  };
};

var degrees = 180 / Math.PI;

var identity$2 = {
  translateX: 0,
  translateY: 0,
  rotate: 0,
  skewX: 0,
  scaleX: 1,
  scaleY: 1
};

var decompose = function(a, b, c, d, e, f) {
  var scaleX, scaleY, skewX;
  if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
  if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
  if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
  if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
  return {
    translateX: e,
    translateY: f,
    rotate: Math.atan2(b, a) * degrees,
    skewX: Math.atan(skewX) * degrees,
    scaleX: scaleX,
    scaleY: scaleY
  };
};

var cssNode;
var cssRoot;
var cssView;
var svgNode;

function parseCss(value) {
  if (value === "none") return identity$2;
  if (!cssNode) cssNode = document.createElement("DIV"), cssRoot = document.documentElement, cssView = document.defaultView;
  cssNode.style.transform = value;
  value = cssView.getComputedStyle(cssRoot.appendChild(cssNode), null).getPropertyValue("transform");
  cssRoot.removeChild(cssNode);
  value = value.slice(7, -1).split(",");
  return decompose(+value[0], +value[1], +value[2], +value[3], +value[4], +value[5]);
}

function parseSvg(value) {
  if (value == null) return identity$2;
  if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
  svgNode.setAttribute("transform", value);
  if (!(value = svgNode.transform.baseVal.consolidate())) return identity$2;
  value = value.matrix;
  return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
}

function interpolateTransform(parse, pxComma, pxParen, degParen) {

  function pop(s) {
    return s.length ? s.pop() + " " : "";
  }

  function translate(xa, ya, xb, yb, s, q) {
    if (xa !== xb || ya !== yb) {
      var i = s.push("translate(", null, pxComma, null, pxParen);
      q.push({i: i - 4, x: reinterpolate(xa, xb)}, {i: i - 2, x: reinterpolate(ya, yb)});
    } else if (xb || yb) {
      s.push("translate(" + xb + pxComma + yb + pxParen);
    }
  }

  function rotate(a, b, s, q) {
    if (a !== b) {
      if (a - b > 180) b += 360; else if (b - a > 180) a += 360; // shortest path
      q.push({i: s.push(pop(s) + "rotate(", null, degParen) - 2, x: reinterpolate(a, b)});
    } else if (b) {
      s.push(pop(s) + "rotate(" + b + degParen);
    }
  }

  function skewX(a, b, s, q) {
    if (a !== b) {
      q.push({i: s.push(pop(s) + "skewX(", null, degParen) - 2, x: reinterpolate(a, b)});
    } else if (b) {
      s.push(pop(s) + "skewX(" + b + degParen);
    }
  }

  function scale(xa, ya, xb, yb, s, q) {
    if (xa !== xb || ya !== yb) {
      var i = s.push(pop(s) + "scale(", null, ",", null, ")");
      q.push({i: i - 4, x: reinterpolate(xa, xb)}, {i: i - 2, x: reinterpolate(ya, yb)});
    } else if (xb !== 1 || yb !== 1) {
      s.push(pop(s) + "scale(" + xb + "," + yb + ")");
    }
  }

  return function(a, b) {
    var s = [], // string constants and placeholders
        q = []; // number interpolators
    a = parse(a), b = parse(b);
    translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
    rotate(a.rotate, b.rotate, s, q);
    skewX(a.skewX, b.skewX, s, q);
    scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
    a = b = null; // gc
    return function(t) {
      var i = -1, n = q.length, o;
      while (++i < n) s[(o = q[i]).i] = o.x(t);
      return s.join("");
    };
  };
}

var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");

var rho = Math.SQRT2;
var rho2 = 2;
var rho4 = 4;
var epsilon2 = 1e-12;

function cosh(x) {
  return ((x = Math.exp(x)) + 1 / x) / 2;
}

function sinh(x) {
  return ((x = Math.exp(x)) - 1 / x) / 2;
}

function tanh(x) {
  return ((x = Math.exp(2 * x)) - 1) / (x + 1);
}

// p0 = [ux0, uy0, w0]
// p1 = [ux1, uy1, w1]
var interpolateZoom = function(p0, p1) {
  var ux0 = p0[0], uy0 = p0[1], w0 = p0[2],
      ux1 = p1[0], uy1 = p1[1], w1 = p1[2],
      dx = ux1 - ux0,
      dy = uy1 - uy0,
      d2 = dx * dx + dy * dy,
      i,
      S;

  // Special case for u0 ≅ u1.
  if (d2 < epsilon2) {
    S = Math.log(w1 / w0) / rho;
    i = function(t) {
      return [
        ux0 + t * dx,
        uy0 + t * dy,
        w0 * Math.exp(rho * t * S)
      ];
    };
  }

  // General case.
  else {
    var d1 = Math.sqrt(d2),
        b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
        b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
        r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
        r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
    S = (r1 - r0) / rho;
    i = function(t) {
      var s = t * S,
          coshr0 = cosh(r0),
          u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
      return [
        ux0 + u * dx,
        uy0 + u * dy,
        w0 * coshr0 / cosh(rho * s + r0)
      ];
    };
  }

  i.duration = S * 1000;

  return i;
};

function hsl$1(hue$$1) {
  return function(start, end) {
    var h = hue$$1((start = hsl(start)).h, (end = hsl(end)).h),
        s = nogamma(start.s, end.s),
        l = nogamma(start.l, end.l),
        opacity = nogamma(start.opacity, end.opacity);
    return function(t) {
      start.h = h(t);
      start.s = s(t);
      start.l = l(t);
      start.opacity = opacity(t);
      return start + "";
    };
  }
}

var hsl$2 = hsl$1(hue);
var hslLong = hsl$1(nogamma);

function lab$1(start, end) {
  var l = nogamma((start = lab(start)).l, (end = lab(end)).l),
      a = nogamma(start.a, end.a),
      b = nogamma(start.b, end.b),
      opacity = nogamma(start.opacity, end.opacity);
  return function(t) {
    start.l = l(t);
    start.a = a(t);
    start.b = b(t);
    start.opacity = opacity(t);
    return start + "";
  };
}

function hcl$1(hue$$1) {
  return function(start, end) {
    var h = hue$$1((start = hcl(start)).h, (end = hcl(end)).h),
        c = nogamma(start.c, end.c),
        l = nogamma(start.l, end.l),
        opacity = nogamma(start.opacity, end.opacity);
    return function(t) {
      start.h = h(t);
      start.c = c(t);
      start.l = l(t);
      start.opacity = opacity(t);
      return start + "";
    };
  }
}

var hcl$2 = hcl$1(hue);
var hclLong = hcl$1(nogamma);

function cubehelix$1(hue$$1) {
  return (function cubehelixGamma(y) {
    y = +y;

    function cubehelix$$1(start, end) {
      var h = hue$$1((start = cubehelix(start)).h, (end = cubehelix(end)).h),
          s = nogamma(start.s, end.s),
          l = nogamma(start.l, end.l),
          opacity = nogamma(start.opacity, end.opacity);
      return function(t) {
        start.h = h(t);
        start.s = s(t);
        start.l = l(Math.pow(t, y));
        start.opacity = opacity(t);
        return start + "";
      };
    }

    cubehelix$$1.gamma = cubehelixGamma;

    return cubehelix$$1;
  })(1);
}

var cubehelix$2 = cubehelix$1(hue);
var cubehelixLong = cubehelix$1(nogamma);

var quantize = function(interpolator, n) {
  var samples = new Array(n);
  for (var i = 0; i < n; ++i) samples[i] = interpolator(i / (n - 1));
  return samples;
};

var frame = 0;
var timeout = 0;
var interval = 0;
var pokeDelay = 1000;
var taskHead;
var taskTail;
var clockLast = 0;
var clockNow = 0;
var clockSkew = 0;
var clock = typeof performance === "object" && performance.now ? performance : Date;
var setFrame = typeof window === "object" && window.requestAnimationFrame ? window.requestAnimationFrame.bind(window) : function(f) { setTimeout(f, 17); };

function now() {
  return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
}

function clearNow() {
  clockNow = 0;
}

function Timer() {
  this._call =
  this._time =
  this._next = null;
}

Timer.prototype = timer.prototype = {
  constructor: Timer,
  restart: function(callback, delay, time) {
    if (typeof callback !== "function") throw new TypeError("callback is not a function");
    time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
    if (!this._next && taskTail !== this) {
      if (taskTail) taskTail._next = this;
      else taskHead = this;
      taskTail = this;
    }
    this._call = callback;
    this._time = time;
    sleep();
  },
  stop: function() {
    if (this._call) {
      this._call = null;
      this._time = Infinity;
      sleep();
    }
  }
};

function timer(callback, delay, time) {
  var t = new Timer;
  t.restart(callback, delay, time);
  return t;
}

function timerFlush() {
  now(); // Get the current time, if not already set.
  ++frame; // Pretend we’ve set an alarm, if we haven’t already.
  var t = taskHead, e;
  while (t) {
    if ((e = clockNow - t._time) >= 0) t._call.call(null, e);
    t = t._next;
  }
  --frame;
}

function wake() {
  clockNow = (clockLast = clock.now()) + clockSkew;
  frame = timeout = 0;
  try {
    timerFlush();
  } finally {
    frame = 0;
    nap();
    clockNow = 0;
  }
}

function poke() {
  var now = clock.now(), delay = now - clockLast;
  if (delay > pokeDelay) clockSkew -= delay, clockLast = now;
}

function nap() {
  var t0, t1 = taskHead, t2, time = Infinity;
  while (t1) {
    if (t1._call) {
      if (time > t1._time) time = t1._time;
      t0 = t1, t1 = t1._next;
    } else {
      t2 = t1._next, t1._next = null;
      t1 = t0 ? t0._next = t2 : taskHead = t2;
    }
  }
  taskTail = t0;
  sleep(time);
}

function sleep(time) {
  if (frame) return; // Soonest alarm already set, or will be.
  if (timeout) timeout = clearTimeout(timeout);
  var delay = time - clockNow; // Strictly less than if we recomputed clockNow.
  if (delay > 24) {
    if (time < Infinity) timeout = setTimeout(wake, time - clock.now() - clockSkew);
    if (interval) interval = clearInterval(interval);
  } else {
    if (!interval) clockLast = clock.now(), interval = setInterval(poke, pokeDelay);
    frame = 1, setFrame(wake);
  }
}

var timeout$1 = function(callback, delay, time) {
  var t = new Timer;
  delay = delay == null ? 0 : +delay;
  t.restart(function(elapsed) {
    t.stop();
    callback(elapsed + delay);
  }, delay, time);
  return t;
};

var interval$1 = function(callback, delay, time) {
  var t = new Timer, total = delay;
  if (delay == null) return t.restart(callback, delay, time), t;
  delay = +delay, time = time == null ? now() : +time;
  t.restart(function tick(elapsed) {
    elapsed += total;
    t.restart(tick, total += delay, time);
    callback(elapsed);
  }, delay, time);
  return t;
};

var emptyOn = dispatch("start", "end", "interrupt");
var emptyTween = [];

var CREATED = 0;
var SCHEDULED = 1;
var STARTING = 2;
var STARTED = 3;
var RUNNING = 4;
var ENDING = 5;
var ENDED = 6;

var schedule = function(node, name, id, index, group, timing) {
  var schedules = node.__transition;
  if (!schedules) node.__transition = {};
  else if (id in schedules) return;
  create(node, id, {
    name: name,
    index: index, // For context during callback.
    group: group, // For context during callback.
    on: emptyOn,
    tween: emptyTween,
    time: timing.time,
    delay: timing.delay,
    duration: timing.duration,
    ease: timing.ease,
    timer: null,
    state: CREATED
  });
};

function init(node, id) {
  var schedule = node.__transition;
  if (!schedule || !(schedule = schedule[id]) || schedule.state > CREATED) throw new Error("too late");
  return schedule;
}

function set$1(node, id) {
  var schedule = node.__transition;
  if (!schedule || !(schedule = schedule[id]) || schedule.state > STARTING) throw new Error("too late");
  return schedule;
}

function get$1(node, id) {
  var schedule = node.__transition;
  if (!schedule || !(schedule = schedule[id])) throw new Error("too late");
  return schedule;
}

function create(node, id, self) {
  var schedules = node.__transition,
      tween;

  // Initialize the self timer when the transition is created.
  // Note the actual delay is not known until the first callback!
  schedules[id] = self;
  self.timer = timer(schedule, 0, self.time);

  function schedule(elapsed) {
    self.state = SCHEDULED;
    self.timer.restart(start, self.delay, self.time);

    // If the elapsed delay is less than our first sleep, start immediately.
    if (self.delay <= elapsed) start(elapsed - self.delay);
  }

  function start(elapsed) {
    var i, j, n, o;

    // If the state is not SCHEDULED, then we previously errored on start.
    if (self.state !== SCHEDULED) return stop();

    for (i in schedules) {
      o = schedules[i];
      if (o.name !== self.name) continue;

      // While this element already has a starting transition during this frame,
      // defer starting an interrupting transition until that transition has a
      // chance to tick (and possibly end); see d3/d3-transition#54!
      if (o.state === STARTED) return timeout$1(start);

      // Interrupt the active transition, if any.
      // Dispatch the interrupt event.
      if (o.state === RUNNING) {
        o.state = ENDED;
        o.timer.stop();
        o.on.call("interrupt", node, node.__data__, o.index, o.group);
        delete schedules[i];
      }

      // Cancel any pre-empted transitions. No interrupt event is dispatched
      // because the cancelled transitions never started. Note that this also
      // removes this transition from the pending list!
      else if (+i < id) {
        o.state = ENDED;
        o.timer.stop();
        delete schedules[i];
      }
    }

    // Defer the first tick to end of the current frame; see d3/d3#1576.
    // Note the transition may be canceled after start and before the first tick!
    // Note this must be scheduled before the start event; see d3/d3-transition#16!
    // Assuming this is successful, subsequent callbacks go straight to tick.
    timeout$1(function() {
      if (self.state === STARTED) {
        self.state = RUNNING;
        self.timer.restart(tick, self.delay, self.time);
        tick(elapsed);
      }
    });

    // Dispatch the start event.
    // Note this must be done before the tween are initialized.
    self.state = STARTING;
    self.on.call("start", node, node.__data__, self.index, self.group);
    if (self.state !== STARTING) return; // interrupted
    self.state = STARTED;

    // Initialize the tween, deleting null tween.
    tween = new Array(n = self.tween.length);
    for (i = 0, j = -1; i < n; ++i) {
      if (o = self.tween[i].value.call(node, node.__data__, self.index, self.group)) {
        tween[++j] = o;
      }
    }
    tween.length = j + 1;
  }

  function tick(elapsed) {
    var t = elapsed < self.duration ? self.ease.call(null, elapsed / self.duration) : (self.timer.restart(stop), self.state = ENDING, 1),
        i = -1,
        n = tween.length;

    while (++i < n) {
      tween[i].call(null, t);
    }

    // Dispatch the end event.
    if (self.state === ENDING) {
      self.on.call("end", node, node.__data__, self.index, self.group);
      stop();
    }
  }

  function stop() {
    self.state = ENDED;
    self.timer.stop();
    delete schedules[id];
    for (var i in schedules) return; // eslint-disable-line no-unused-vars
    delete node.__transition;
  }
}

var interrupt = function(node, name) {
  var schedules = node.__transition,
      schedule,
      active,
      empty = true,
      i;

  if (!schedules) return;

  name = name == null ? null : name + "";

  for (i in schedules) {
    if ((schedule = schedules[i]).name !== name) { empty = false; continue; }
    active = schedule.state > STARTING && schedule.state < ENDING;
    schedule.state = ENDED;
    schedule.timer.stop();
    if (active) schedule.on.call("interrupt", node, node.__data__, schedule.index, schedule.group);
    delete schedules[i];
  }

  if (empty) delete node.__transition;
};

var selection_interrupt = function(name) {
  return this.each(function() {
    interrupt(this, name);
  });
};

function tweenRemove(id, name) {
  var tween0, tween1;
  return function() {
    var schedule = set$1(this, id),
        tween = schedule.tween;

    // If this node shared tween with the previous node,
    // just assign the updated shared tween and we’re done!
    // Otherwise, copy-on-write.
    if (tween !== tween0) {
      tween1 = tween0 = tween;
      for (var i = 0, n = tween1.length; i < n; ++i) {
        if (tween1[i].name === name) {
          tween1 = tween1.slice();
          tween1.splice(i, 1);
          break;
        }
      }
    }

    schedule.tween = tween1;
  };
}

function tweenFunction(id, name, value) {
  var tween0, tween1;
  if (typeof value !== "function") throw new Error;
  return function() {
    var schedule = set$1(this, id),
        tween = schedule.tween;

    // If this node shared tween with the previous node,
    // just assign the updated shared tween and we’re done!
    // Otherwise, copy-on-write.
    if (tween !== tween0) {
      tween1 = (tween0 = tween).slice();
      for (var t = {name: name, value: value}, i = 0, n = tween1.length; i < n; ++i) {
        if (tween1[i].name === name) {
          tween1[i] = t;
          break;
        }
      }
      if (i === n) tween1.push(t);
    }

    schedule.tween = tween1;
  };
}

var transition_tween = function(name, value) {
  var id = this._id;

  name += "";

  if (arguments.length < 2) {
    var tween = get$1(this.node(), id).tween;
    for (var i = 0, n = tween.length, t; i < n; ++i) {
      if ((t = tween[i]).name === name) {
        return t.value;
      }
    }
    return null;
  }

  return this.each((value == null ? tweenRemove : tweenFunction)(id, name, value));
};

function tweenValue(transition, name, value) {
  var id = transition._id;

  transition.each(function() {
    var schedule = set$1(this, id);
    (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
  });

  return function(node) {
    return get$1(node, id).value[name];
  };
}

var interpolate$$1 = function(a, b) {
  var c;
  return (typeof b === "number" ? reinterpolate
      : b instanceof color ? interpolateRgb
      : (c = color(b)) ? (b = c, interpolateRgb)
      : interpolateString)(a, b);
};

function attrRemove$1(name) {
  return function() {
    this.removeAttribute(name);
  };
}

function attrRemoveNS$1(fullname) {
  return function() {
    this.removeAttributeNS(fullname.space, fullname.local);
  };
}

function attrConstant$1(name, interpolate$$1, value1) {
  var value00,
      interpolate0;
  return function() {
    var value0 = this.getAttribute(name);
    return value0 === value1 ? null
        : value0 === value00 ? interpolate0
        : interpolate0 = interpolate$$1(value00 = value0, value1);
  };
}

function attrConstantNS$1(fullname, interpolate$$1, value1) {
  var value00,
      interpolate0;
  return function() {
    var value0 = this.getAttributeNS(fullname.space, fullname.local);
    return value0 === value1 ? null
        : value0 === value00 ? interpolate0
        : interpolate0 = interpolate$$1(value00 = value0, value1);
  };
}

function attrFunction$1(name, interpolate$$1, value) {
  var value00,
      value10,
      interpolate0;
  return function() {
    var value0, value1 = value(this);
    if (value1 == null) return void this.removeAttribute(name);
    value0 = this.getAttribute(name);
    return value0 === value1 ? null
        : value0 === value00 && value1 === value10 ? interpolate0
        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
  };
}

function attrFunctionNS$1(fullname, interpolate$$1, value) {
  var value00,
      value10,
      interpolate0;
  return function() {
    var value0, value1 = value(this);
    if (value1 == null) return void this.removeAttributeNS(fullname.space, fullname.local);
    value0 = this.getAttributeNS(fullname.space, fullname.local);
    return value0 === value1 ? null
        : value0 === value00 && value1 === value10 ? interpolate0
        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
  };
}

var transition_attr = function(name, value) {
  var fullname = namespace(name), i = fullname === "transform" ? interpolateTransformSvg : interpolate$$1;
  return this.attrTween(name, typeof value === "function"
      ? (fullname.local ? attrFunctionNS$1 : attrFunction$1)(fullname, i, tweenValue(this, "attr." + name, value))
      : value == null ? (fullname.local ? attrRemoveNS$1 : attrRemove$1)(fullname)
      : (fullname.local ? attrConstantNS$1 : attrConstant$1)(fullname, i, value + ""));
};

function attrTweenNS(fullname, value) {
  function tween() {
    var node = this, i = value.apply(node, arguments);
    return i && function(t) {
      node.setAttributeNS(fullname.space, fullname.local, i(t));
    };
  }
  tween._value = value;
  return tween;
}

function attrTween(name, value) {
  function tween() {
    var node = this, i = value.apply(node, arguments);
    return i && function(t) {
      node.setAttribute(name, i(t));
    };
  }
  tween._value = value;
  return tween;
}

var transition_attrTween = function(name, value) {
  var key = "attr." + name;
  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
  if (value == null) return this.tween(key, null);
  if (typeof value !== "function") throw new Error;
  var fullname = namespace(name);
  return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
};

function delayFunction(id, value) {
  return function() {
    init(this, id).delay = +value.apply(this, arguments);
  };
}

function delayConstant(id, value) {
  return value = +value, function() {
    init(this, id).delay = value;
  };
}

var transition_delay = function(value) {
  var id = this._id;

  return arguments.length
      ? this.each((typeof value === "function"
          ? delayFunction
          : delayConstant)(id, value))
      : get$1(this.node(), id).delay;
};

function durationFunction(id, value) {
  return function() {
    set$1(this, id).duration = +value.apply(this, arguments);
  };
}

function durationConstant(id, value) {
  return value = +value, function() {
    set$1(this, id).duration = value;
  };
}

var transition_duration = function(value) {
  var id = this._id;

  return arguments.length
      ? this.each((typeof value === "function"
          ? durationFunction
          : durationConstant)(id, value))
      : get$1(this.node(), id).duration;
};

function easeConstant(id, value) {
  if (typeof value !== "function") throw new Error;
  return function() {
    set$1(this, id).ease = value;
  };
}

var transition_ease = function(value) {
  var id = this._id;

  return arguments.length
      ? this.each(easeConstant(id, value))
      : get$1(this.node(), id).ease;
};

var transition_filter = function(match) {
  if (typeof match !== "function") match = matcher$1(match);

  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
        subgroup.push(node);
      }
    }
  }

  return new Transition(subgroups, this._parents, this._name, this._id);
};

var transition_merge = function(transition) {
  if (transition._id !== this._id) throw new Error;

  for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
      if (node = group0[i] || group1[i]) {
        merge[i] = node;
      }
    }
  }

  for (; j < m0; ++j) {
    merges[j] = groups0[j];
  }

  return new Transition(merges, this._parents, this._name, this._id);
};

function start(name) {
  return (name + "").trim().split(/^|\s+/).every(function(t) {
    var i = t.indexOf(".");
    if (i >= 0) t = t.slice(0, i);
    return !t || t === "start";
  });
}

function onFunction(id, name, listener) {
  var on0, on1, sit = start(name) ? init : set$1;
  return function() {
    var schedule = sit(this, id),
        on = schedule.on;

    // If this node shared a dispatch with the previous node,
    // just assign the updated shared dispatch and we’re done!
    // Otherwise, copy-on-write.
    if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);

    schedule.on = on1;
  };
}

var transition_on = function(name, listener) {
  var id = this._id;

  return arguments.length < 2
      ? get$1(this.node(), id).on.on(name)
      : this.each(onFunction(id, name, listener));
};

function removeFunction(id) {
  return function() {
    var parent = this.parentNode;
    for (var i in this.__transition) if (+i !== id) return;
    if (parent) parent.removeChild(this);
  };
}

var transition_remove = function() {
  return this.on("end.remove", removeFunction(this._id));
};

var transition_select = function(select$$1) {
  var name = this._name,
      id = this._id;

  if (typeof select$$1 !== "function") select$$1 = selector(select$$1);

  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
      if ((node = group[i]) && (subnode = select$$1.call(node, node.__data__, i, group))) {
        if ("__data__" in node) subnode.__data__ = node.__data__;
        subgroup[i] = subnode;
        schedule(subgroup[i], name, id, i, subgroup, get$1(node, id));
      }
    }
  }

  return new Transition(subgroups, this._parents, name, id);
};

var transition_selectAll = function(select$$1) {
  var name = this._name,
      id = this._id;

  if (typeof select$$1 !== "function") select$$1 = selectorAll(select$$1);

  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        for (var children = select$$1.call(node, node.__data__, i, group), child, inherit = get$1(node, id), k = 0, l = children.length; k < l; ++k) {
          if (child = children[k]) {
            schedule(child, name, id, k, children, inherit);
          }
        }
        subgroups.push(children);
        parents.push(node);
      }
    }
  }

  return new Transition(subgroups, parents, name, id);
};

var Selection$1 = selection.prototype.constructor;

var transition_selection = function() {
  return new Selection$1(this._groups, this._parents);
};

function styleRemove$1(name, interpolate$$2) {
  var value00,
      value10,
      interpolate0;
  return function() {
    var value0 = styleValue(this, name),
        value1 = (this.style.removeProperty(name), styleValue(this, name));
    return value0 === value1 ? null
        : value0 === value00 && value1 === value10 ? interpolate0
        : interpolate0 = interpolate$$2(value00 = value0, value10 = value1);
  };
}

function styleRemoveEnd(name) {
  return function() {
    this.style.removeProperty(name);
  };
}

function styleConstant$1(name, interpolate$$2, value1) {
  var value00,
      interpolate0;
  return function() {
    var value0 = styleValue(this, name);
    return value0 === value1 ? null
        : value0 === value00 ? interpolate0
        : interpolate0 = interpolate$$2(value00 = value0, value1);
  };
}

function styleFunction$1(name, interpolate$$2, value) {
  var value00,
      value10,
      interpolate0;
  return function() {
    var value0 = styleValue(this, name),
        value1 = value(this);
    if (value1 == null) value1 = (this.style.removeProperty(name), styleValue(this, name));
    return value0 === value1 ? null
        : value0 === value00 && value1 === value10 ? interpolate0
        : interpolate0 = interpolate$$2(value00 = value0, value10 = value1);
  };
}

var transition_style = function(name, value, priority) {
  var i = (name += "") === "transform" ? interpolateTransformCss : interpolate$$1;
  return value == null ? this
          .styleTween(name, styleRemove$1(name, i))
          .on("end.style." + name, styleRemoveEnd(name))
      : this.styleTween(name, typeof value === "function"
          ? styleFunction$1(name, i, tweenValue(this, "style." + name, value))
          : styleConstant$1(name, i, value + ""), priority);
};

function styleTween(name, value, priority) {
  function tween() {
    var node = this, i = value.apply(node, arguments);
    return i && function(t) {
      node.style.setProperty(name, i(t), priority);
    };
  }
  tween._value = value;
  return tween;
}

var transition_styleTween = function(name, value, priority) {
  var key = "style." + (name += "");
  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
  if (value == null) return this.tween(key, null);
  if (typeof value !== "function") throw new Error;
  return this.tween(key, styleTween(name, value, priority == null ? "" : priority));
};

function textConstant$1(value) {
  return function() {
    this.textContent = value;
  };
}

function textFunction$1(value) {
  return function() {
    var value1 = value(this);
    this.textContent = value1 == null ? "" : value1;
  };
}

var transition_text = function(value) {
  return this.tween("text", typeof value === "function"
      ? textFunction$1(tweenValue(this, "text", value))
      : textConstant$1(value == null ? "" : value + ""));
};

var transition_transition = function() {
  var name = this._name,
      id0 = this._id,
      id1 = newId();

  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        var inherit = get$1(node, id0);
        schedule(node, name, id1, i, group, {
          time: inherit.time + inherit.delay + inherit.duration,
          delay: 0,
          duration: inherit.duration,
          ease: inherit.ease
        });
      }
    }
  }

  return new Transition(groups, this._parents, name, id1);
};

var id = 0;

function Transition(groups, parents, name, id) {
  this._groups = groups;
  this._parents = parents;
  this._name = name;
  this._id = id;
}

function transition(name) {
  return selection().transition(name);
}

function newId() {
  return ++id;
}

var selection_prototype = selection.prototype;

Transition.prototype = transition.prototype = {
  constructor: Transition,
  select: transition_select,
  selectAll: transition_selectAll,
  filter: transition_filter,
  merge: transition_merge,
  selection: transition_selection,
  transition: transition_transition,
  call: selection_prototype.call,
  nodes: selection_prototype.nodes,
  node: selection_prototype.node,
  size: selection_prototype.size,
  empty: selection_prototype.empty,
  each: selection_prototype.each,
  on: transition_on,
  attr: transition_attr,
  attrTween: transition_attrTween,
  style: transition_style,
  styleTween: transition_styleTween,
  text: transition_text,
  remove: transition_remove,
  tween: transition_tween,
  delay: transition_delay,
  duration: transition_duration,
  ease: transition_ease
};

function linear$1(t) {
  return +t;
}

function quadIn(t) {
  return t * t;
}

function quadOut(t) {
  return t * (2 - t);
}

function quadInOut(t) {
  return ((t *= 2) <= 1 ? t * t : --t * (2 - t) + 1) / 2;
}

function cubicIn(t) {
  return t * t * t;
}

function cubicOut(t) {
  return --t * t * t + 1;
}

function cubicInOut(t) {
  return ((t *= 2) <= 1 ? t * t * t : (t -= 2) * t * t + 2) / 2;
}

var exponent = 3;

var polyIn = (function custom(e) {
  e = +e;

  function polyIn(t) {
    return Math.pow(t, e);
  }

  polyIn.exponent = custom;

  return polyIn;
})(exponent);

var polyOut = (function custom(e) {
  e = +e;

  function polyOut(t) {
    return 1 - Math.pow(1 - t, e);
  }

  polyOut.exponent = custom;

  return polyOut;
})(exponent);

var polyInOut = (function custom(e) {
  e = +e;

  function polyInOut(t) {
    return ((t *= 2) <= 1 ? Math.pow(t, e) : 2 - Math.pow(2 - t, e)) / 2;
  }

  polyInOut.exponent = custom;

  return polyInOut;
})(exponent);

var pi = Math.PI;
var halfPi = pi / 2;

function sinIn(t) {
  return 1 - Math.cos(t * halfPi);
}

function sinOut(t) {
  return Math.sin(t * halfPi);
}

function sinInOut(t) {
  return (1 - Math.cos(pi * t)) / 2;
}

function expIn(t) {
  return Math.pow(2, 10 * t - 10);
}

function expOut(t) {
  return 1 - Math.pow(2, -10 * t);
}

function expInOut(t) {
  return ((t *= 2) <= 1 ? Math.pow(2, 10 * t - 10) : 2 - Math.pow(2, 10 - 10 * t)) / 2;
}

function circleIn(t) {
  return 1 - Math.sqrt(1 - t * t);
}

function circleOut(t) {
  return Math.sqrt(1 - --t * t);
}

function circleInOut(t) {
  return ((t *= 2) <= 1 ? 1 - Math.sqrt(1 - t * t) : Math.sqrt(1 - (t -= 2) * t) + 1) / 2;
}

var b1 = 4 / 11;
var b2 = 6 / 11;
var b3 = 8 / 11;
var b4 = 3 / 4;
var b5 = 9 / 11;
var b6 = 10 / 11;
var b7 = 15 / 16;
var b8 = 21 / 22;
var b9 = 63 / 64;
var b0 = 1 / b1 / b1;

function bounceIn(t) {
  return 1 - bounceOut(1 - t);
}

function bounceOut(t) {
  return (t = +t) < b1 ? b0 * t * t : t < b3 ? b0 * (t -= b2) * t + b4 : t < b6 ? b0 * (t -= b5) * t + b7 : b0 * (t -= b8) * t + b9;
}

function bounceInOut(t) {
  return ((t *= 2) <= 1 ? 1 - bounceOut(1 - t) : bounceOut(t - 1) + 1) / 2;
}

var overshoot = 1.70158;

var backIn = (function custom(s) {
  s = +s;

  function backIn(t) {
    return t * t * ((s + 1) * t - s);
  }

  backIn.overshoot = custom;

  return backIn;
})(overshoot);

var backOut = (function custom(s) {
  s = +s;

  console.log(s)
  function backOut(t) {
    return --t * t * ((s + 1) * t + s) + 1;
  }

  backOut.overshoot = custom;

  return backOut;
})(overshoot);

var backInOut = (function custom(s) {
  s = +s;

  function backInOut(t) {
    return ((t *= 2) < 1 ? t * t * ((s + 1) * t - s) : (t -= 2) * t * ((s + 1) * t + s) + 2) / 2;
  }

  backInOut.overshoot = custom;

  return backInOut;
})(overshoot);

var tau = 2 * Math.PI;
var amplitude = 1;
var period = 0.3;

var elasticIn = (function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticIn(t) {
    return a * Math.pow(2, 10 * --t) * Math.sin((s - t) / p);
  }

  elasticIn.amplitude = function(a) { return custom(a, p * tau); };
  elasticIn.period = function(p) { return custom(a, p); };

  return elasticIn;
})(amplitude, period);

var elasticOut = (function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticOut(t) {
    return 1 - a * Math.pow(2, -10 * (t = +t)) * Math.sin((t + s) / p);
  }

  elasticOut.amplitude = function(a) { return custom(a, p * tau); };
  elasticOut.period = function(p) { return custom(a, p); };

  return elasticOut;
})(amplitude, period);

var elasticInOut = (function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticInOut(t) {
    return ((t = t * 2 - 1) < 0
        ? a * Math.pow(2, 10 * t) * Math.sin((s - t) / p)
        : 2 - a * Math.pow(2, -10 * t) * Math.sin((s + t) / p)) / 2;
  }

  elasticInOut.amplitude = function(a) { return custom(a, p * tau); };
  elasticInOut.period = function(p) { return custom(a, p); };

  return elasticInOut;
})(amplitude, period);

var defaultTiming = {
  time: null, // Set on use.
  delay: 0,
  duration: 250,
  ease: cubicInOut
};

function inherit(node, id) {
  var timing;
  while (!(timing = node.__transition) || !(timing = timing[id])) {
    if (!(node = node.parentNode)) {
      return defaultTiming.time = now(), defaultTiming;
    }
  }
  return timing;
}

var selection_transition = function(name) {
  var id,
      timing;

  if (name instanceof Transition) {
    id = name._id, name = name._name;
  } else {
    id = newId(), (timing = defaultTiming).time = now(), name = name == null ? null : name + "";
  }

  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        schedule(node, name, id, i, group, timing || inherit(node, id));
      }
    }
  }

  return new Transition(groups, this._parents, name, id);
};

selection.prototype.interrupt = selection_interrupt;
selection.prototype.transition = selection_transition;

var root$1 = [null];

var active = function(node, name) {
  var schedules = node.__transition,
      schedule,
      i;

  if (schedules) {
    name = name == null ? null : name + "";
    for (i in schedules) {
      if ((schedule = schedules[i]).state > SCHEDULED && schedule.name === name) {
        return new Transition([[node]], root$1, name, +i);
      }
    }
  }

  return null;
};

var constant$4 = function(x) {
  return function() {
    return x;
  };
};

var BrushEvent = function(target, type, selection) {
  this.target = target;
  this.type = type;
  this.selection = selection;
};

function nopropagation$1() {
  exports.event.stopImmediatePropagation();
}

var noevent$1 = function() {
  exports.event.preventDefault();
  exports.event.stopImmediatePropagation();
};

var MODE_DRAG = {name: "drag"};
var MODE_SPACE = {name: "space"};
var MODE_HANDLE = {name: "handle"};
var MODE_CENTER = {name: "center"};

var X = {
  name: "x",
  handles: ["e", "w"].map(type),
  input: function(x, e) { return x && [[x[0], e[0][1]], [x[1], e[1][1]]]; },
  output: function(xy) { return xy && [xy[0][0], xy[1][0]]; }
};

var Y = {
  name: "y",
  handles: ["n", "s"].map(type),
  input: function(y, e) { return y && [[e[0][0], y[0]], [e[1][0], y[1]]]; },
  output: function(xy) { return xy && [xy[0][1], xy[1][1]]; }
};

var XY = {
  name: "xy",
  handles: ["n", "e", "s", "w", "nw", "ne", "se", "sw"].map(type),
  input: function(xy) { return xy; },
  output: function(xy) { return xy; }
};

var cursors = {
  overlay: "crosshair",
  selection: "move",
  n: "ns-resize",
  e: "ew-resize",
  s: "ns-resize",
  w: "ew-resize",
  nw: "nwse-resize",
  ne: "nesw-resize",
  se: "nwse-resize",
  sw: "nesw-resize"
};

var flipX = {
  e: "w",
  w: "e",
  nw: "ne",
  ne: "nw",
  se: "sw",
  sw: "se"
};

var flipY = {
  n: "s",
  s: "n",
  nw: "sw",
  ne: "se",
  se: "ne",
  sw: "nw"
};

var signsX = {
  overlay: +1,
  selection: +1,
  n: null,
  e: +1,
  s: null,
  w: -1,
  nw: -1,
  ne: +1,
  se: +1,
  sw: -1
};

var signsY = {
  overlay: +1,
  selection: +1,
  n: -1,
  e: null,
  s: +1,
  w: null,
  nw: -1,
  ne: -1,
  se: +1,
  sw: +1
};

function type(t) {
  return {type: t};
}

// Ignore right-click, since that should open the context menu.
function defaultFilter() {
  return !exports.event.button;
}

function defaultExtent() {
  var svg = this.ownerSVGElement || this;
  return [[0, 0], [svg.width.baseVal.value, svg.height.baseVal.value]];
}

// Like d3.local, but with the name “__brush” rather than auto-generated.
function local$$1(node) {
  while (!node.__brush) if (!(node = node.parentNode)) return;
  return node.__brush;
}

function empty(extent) {
  return extent[0][0] === extent[1][0]
      || extent[0][1] === extent[1][1];
}

function brushSelection(node) {
  var state = node.__brush;
  return state ? state.dim.output(state.selection) : null;
}

function brushX() {
  return brush$1(X);
}

function brushY() {
  return brush$1(Y);
}

var brush = function() {
  return brush$1(XY);
};

function brush$1(dim) {
  var extent = defaultExtent,
      filter = defaultFilter,
      listeners = dispatch(brush, "start", "brush", "end"),
      handleSize = 6,
      touchending;

  function brush(group) {
    var overlay = group
        .property("__brush", initialize)
      .selectAll(".overlay")
      .data([type("overlay")]);

    overlay.enter().append("rect")
        .attr("class", "overlay")
        .attr("pointer-events", "all")
        .attr("cursor", cursors.overlay)
      .merge(overlay)
        .each(function() {
          var extent = local$$1(this).extent;
          select(this)
              .attr("x", extent[0][0])
              .attr("y", extent[0][1])
              .attr("width", extent[1][0] - extent[0][0])
              .attr("height", extent[1][1] - extent[0][1]);
        });

    group.selectAll(".selection")
      .data([type("selection")])
      .enter().append("rect")
        .attr("class", "selection")
        .attr("cursor", cursors.selection)
        .attr("fill", "#777")
        .attr("fill-opacity", 0.3)
        .attr("stroke", "#fff")
        .attr("shape-rendering", "crispEdges");

    var handle = group.selectAll(".handle")
      .data(dim.handles, function(d) { return d.type; });

    handle.exit().remove();

    handle.enter().append("rect")
        .attr("class", function(d) { return "handle handle--" + d.type; })
        .attr("cursor", function(d) { return cursors[d.type]; });

    group
        .each(redraw)
        .attr("fill", "none")
        .attr("pointer-events", "all")
        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)")
        .on("mousedown.brush touchstart.brush", started);
  }

  brush.move = function(group, selection$$1) {
    if (group.selection) {
      group
          .on("start.brush", function() { emitter(this, arguments).beforestart().start(); })
          .on("interrupt.brush end.brush", function() { emitter(this, arguments).end(); })
          .tween("brush", function() {
            var that = this,
                state = that.__brush,
                emit = emitter(that, arguments),
                selection0 = state.selection,
                selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(this, arguments) : selection$$1, state.extent),
                i = interpolateValue(selection0, selection1);

            function tween(t) {
              state.selection = t === 1 && empty(selection1) ? null : i(t);
              redraw.call(that);
              emit.brush();
            }

            return selection0 && selection1 ? tween : tween(1);
          });
    } else {
      group
          .each(function() {
            var that = this,
                args = arguments,
                state = that.__brush,
                selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(that, args) : selection$$1, state.extent),
                emit = emitter(that, args).beforestart();

            interrupt(that);
            state.selection = selection1 == null || empty(selection1) ? null : selection1;
            redraw.call(that);
            emit.start().brush().end();
          });
    }
  };

  function redraw() {
    var group = select(this),
        selection$$1 = local$$1(this).selection;

    if (selection$$1) {
      group.selectAll(".selection")
          .style("display", null)
          .attr("x", selection$$1[0][0])
          .attr("y", selection$$1[0][1])
          .attr("width", selection$$1[1][0] - selection$$1[0][0])
          .attr("height", selection$$1[1][1] - selection$$1[0][1]);

      group.selectAll(".handle")
          .style("display", null)
          .attr("x", function(d) { return d.type[d.type.length - 1] === "e" ? selection$$1[1][0] - handleSize / 2 : selection$$1[0][0] - handleSize / 2; })
          .attr("y", function(d) { return d.type[0] === "s" ? selection$$1[1][1] - handleSize / 2 : selection$$1[0][1] - handleSize / 2; })
          .attr("width", function(d) { return d.type === "n" || d.type === "s" ? selection$$1[1][0] - selection$$1[0][0] + handleSize : handleSize; })
          .attr("height", function(d) { return d.type === "e" || d.type === "w" ? selection$$1[1][1] - selection$$1[0][1] + handleSize : handleSize; });
    }

    else {
      group.selectAll(".selection,.handle")
          .style("display", "none")
          .attr("x", null)
          .attr("y", null)
          .attr("width", null)
          .attr("height", null);
    }
  }

  function emitter(that, args) {
    return that.__brush.emitter || new Emitter(that, args);
  }

  function Emitter(that, args) {
    this.that = that;
    this.args = args;
    this.state = that.__brush;
    this.active = 0;
  }

  Emitter.prototype = {
    beforestart: function() {
      if (++this.active === 1) this.state.emitter = this, this.starting = true;
      return this;
    },
    start: function() {
      if (this.starting) this.starting = false, this.emit("start");
      return this;
    },
    brush: function() {
      this.emit("brush");
      return this;
    },
    end: function() {
      if (--this.active === 0) delete this.state.emitter, this.emit("end");
      return this;
    },
    emit: function(type) {
      customEvent(new BrushEvent(brush, type, dim.output(this.state.selection)), listeners.apply, listeners, [type, this.that, this.args]);
    }
  };

  function started() {
    if (exports.event.touches) { if (exports.event.changedTouches.length < exports.event.touches.length) return noevent$1(); }
    else if (touchending) return;
    if (!filter.apply(this, arguments)) return;

    var that = this,
        type = exports.event.target.__data__.type,
        mode = (exports.event.metaKey ? type = "overlay" : type) === "selection" ? MODE_DRAG : (exports.event.altKey ? MODE_CENTER : MODE_HANDLE),
        signX = dim === Y ? null : signsX[type],
        signY = dim === X ? null : signsY[type],
        state = local$$1(that),
        extent = state.extent,
        selection$$1 = state.selection,
        W = extent[0][0], w0, w1,
        N = extent[0][1], n0, n1,
        E = extent[1][0], e0, e1,
        S = extent[1][1], s0, s1,
        dx,
        dy,
        moving,
        shifting = signX && signY && exports.event.shiftKey,
        lockX,
        lockY,
        point0 = mouse(that),
        point = point0,
        emit = emitter(that, arguments).beforestart();

    if (type === "overlay") {
      state.selection = selection$$1 = [
        [w0 = dim === Y ? W : point0[0], n0 = dim === X ? N : point0[1]],
        [e0 = dim === Y ? E : w0, s0 = dim === X ? S : n0]
      ];
    } else {
      w0 = selection$$1[0][0];
      n0 = selection$$1[0][1];
      e0 = selection$$1[1][0];
      s0 = selection$$1[1][1];
    }

    w1 = w0;
    n1 = n0;
    e1 = e0;
    s1 = s0;

    var group = select(that)
        .attr("pointer-events", "none");

    var overlay = group.selectAll(".overlay")
        .attr("cursor", cursors[type]);

    if (exports.event.touches) {
      group
          .on("touchmove.brush", moved, true)
          .on("touchend.brush touchcancel.brush", ended, true);
    } else {
      var view = select(exports.event.view)
          .on("keydown.brush", keydowned, true)
          .on("keyup.brush", keyupped, true)
          .on("mousemove.brush", moved, true)
          .on("mouseup.brush", ended, true);

      dragDisable(exports.event.view);
    }

    nopropagation$1();
    interrupt(that);
    redraw.call(that);
    emit.start();

    function moved() {
      var point1 = mouse(that);
      if (shifting && !lockX && !lockY) {
        if (Math.abs(point1[0] - point[0]) > Math.abs(point1[1] - point[1])) lockY = true;
        else lockX = true;
      }
      point = point1;
      moving = true;
      noevent$1();
      move();
    }

    function move() {
      var t;

      dx = point[0] - point0[0];
      dy = point[1] - point0[1];

      switch (mode) {
        case MODE_SPACE:
        case MODE_DRAG: {
          if (signX) dx = Math.max(W - w0, Math.min(E - e0, dx)), w1 = w0 + dx, e1 = e0 + dx;
          if (signY) dy = Math.max(N - n0, Math.min(S - s0, dy)), n1 = n0 + dy, s1 = s0 + dy;
          break;
        }
        case MODE_HANDLE: {
          if (signX < 0) dx = Math.max(W - w0, Math.min(E - w0, dx)), w1 = w0 + dx, e1 = e0;
          else if (signX > 0) dx = Math.max(W - e0, Math.min(E - e0, dx)), w1 = w0, e1 = e0 + dx;
          if (signY < 0) dy = Math.max(N - n0, Math.min(S - n0, dy)), n1 = n0 + dy, s1 = s0;
          else if (signY > 0) dy = Math.max(N - s0, Math.min(S - s0, dy)), n1 = n0, s1 = s0 + dy;
          break;
        }
        case MODE_CENTER: {
          if (signX) w1 = Math.max(W, Math.min(E, w0 - dx * signX)), e1 = Math.max(W, Math.min(E, e0 + dx * signX));
          if (signY) n1 = Math.max(N, Math.min(S, n0 - dy * signY)), s1 = Math.max(N, Math.min(S, s0 + dy * signY));
          break;
        }
      }

      if (e1 < w1) {
        signX *= -1;
        t = w0, w0 = e0, e0 = t;
        t = w1, w1 = e1, e1 = t;
        if (type in flipX) overlay.attr("cursor", cursors[type = flipX[type]]);
      }

      if (s1 < n1) {
        signY *= -1;
        t = n0, n0 = s0, s0 = t;
        t = n1, n1 = s1, s1 = t;
        if (type in flipY) overlay.attr("cursor", cursors[type = flipY[type]]);
      }

      if (state.selection) selection$$1 = state.selection; // May be set by brush.move!
      if (lockX) w1 = selection$$1[0][0], e1 = selection$$1[1][0];
      if (lockY) n1 = selection$$1[0][1], s1 = selection$$1[1][1];

      if (selection$$1[0][0] !== w1
          || selection$$1[0][1] !== n1
          || selection$$1[1][0] !== e1
          || selection$$1[1][1] !== s1) {
        state.selection = [[w1, n1], [e1, s1]];
        redraw.call(that);
        emit.brush();
      }
    }

    function ended() {
      nopropagation$1();
      if (exports.event.touches) {
        if (exports.event.touches.length) return;
        if (touchending) clearTimeout(touchending);
        touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
        group.on("touchmove.brush touchend.brush touchcancel.brush", null);
      } else {
        yesdrag(exports.event.view, moving);
        view.on("keydown.brush keyup.brush mousemove.brush mouseup.brush", null);
      }
      group.attr("pointer-events", "all");
      overlay.attr("cursor", cursors.overlay);
      if (state.selection) selection$$1 = state.selection; // May be set by brush.move (on start)!
      if (empty(selection$$1)) state.selection = null, redraw.call(that);
      emit.end();
    }

    function keydowned() {
      switch (exports.event.keyCode) {
        case 16: { // SHIFT
          shifting = signX && signY;
          break;
        }
        case 18: { // ALT
          if (mode === MODE_HANDLE) {
            if (signX) e0 = e1 - dx * signX, w0 = w1 + dx * signX;
            if (signY) s0 = s1 - dy * signY, n0 = n1 + dy * signY;
            mode = MODE_CENTER;
            move();
          }
          break;
        }
        case 32: { // SPACE; takes priority over ALT
          if (mode === MODE_HANDLE || mode === MODE_CENTER) {
            if (signX < 0) e0 = e1 - dx; else if (signX > 0) w0 = w1 - dx;
            if (signY < 0) s0 = s1 - dy; else if (signY > 0) n0 = n1 - dy;
            mode = MODE_SPACE;
            overlay.attr("cursor", cursors.selection);
            move();
          }
          break;
        }
        default: return;
      }
      noevent$1();
    }

    function keyupped() {
      switch (exports.event.keyCode) {
        case 16: { // SHIFT
          if (shifting) {
            lockX = lockY = shifting = false;
            move();
          }
          break;
        }
        case 18: { // ALT
          if (mode === MODE_CENTER) {
            if (signX < 0) e0 = e1; else if (signX > 0) w0 = w1;
            if (signY < 0) s0 = s1; else if (signY > 0) n0 = n1;
            mode = MODE_HANDLE;
            move();
          }
          break;
        }
        case 32: { // SPACE
          if (mode === MODE_SPACE) {
            if (exports.event.altKey) {
              if (signX) e0 = e1 - dx * signX, w0 = w1 + dx * signX;
              if (signY) s0 = s1 - dy * signY, n0 = n1 + dy * signY;
              mode = MODE_CENTER;
            } else {
              if (signX < 0) e0 = e1; else if (signX > 0) w0 = w1;
              if (signY < 0) s0 = s1; else if (signY > 0) n0 = n1;
              mode = MODE_HANDLE;
            }
            overlay.attr("cursor", cursors[type]);
            move();
          }
          break;
        }
        default: return;
      }
      noevent$1();
    }
  }

  function initialize() {
    var state = this.__brush || {selection: null};
    state.extent = extent.apply(this, arguments);
    state.dim = dim;
    return state;
  }

  brush.extent = function(_) {
    return arguments.length ? (extent = typeof _ === "function" ? _ : constant$4([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), brush) : extent;
  };

  brush.filter = function(_) {
    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$4(!!_), brush) : filter;
  };

  brush.handleSize = function(_) {
    return arguments.length ? (handleSize = +_, brush) : handleSize;
  };

  brush.on = function() {
    var value = listeners.on.apply(listeners, arguments);
    return value === listeners ? brush : value;
  };

  return brush;
}

var ascending$2 = function(a, b) {
  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
};

var bisector$1 = function(compare) {
  if (compare.length === 1) compare = ascendingComparator$1(compare);
  return {
    left: function(a, x, lo, hi) {
      if (lo == null) lo = 0;
      if (hi == null) hi = a.length;
      while (lo < hi) {
        var mid = lo + hi >>> 1;
        if (compare(a[mid], x) < 0) lo = mid + 1;
        else hi = mid;
      }
      return lo;
    },
    right: function(a, x, lo, hi) {
      if (lo == null) lo = 0;
      if (hi == null) hi = a.length;
      while (lo < hi) {
        var mid = lo + hi >>> 1;
        if (compare(a[mid], x) > 0) hi = mid;
        else lo = mid + 1;
      }
      return lo;
    }
  };
};

function ascendingComparator$1(f) {
  return function(d, x) {
    return ascending$2(f(d), x);
  };
}

var ascendingBisect$1 = bisector$1(ascending$2);
var bisectRight$1 = ascendingBisect$1.right;

function pair$1(a, b) {
  return [a, b];
}

var number$2 = function(x) {
  return x === null ? NaN : +x;
};

var extent$1 = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      min,
      max;

  if (valueof == null) {
    while (++i < n) { // Find the first comparable value.
      if ((value = values[i]) != null && value >= value) {
        min = max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = values[i]) != null) {
            if (min > value) min = value;
            if (max < value) max = value;
          }
        }
      }
    }
  }

  else {
    while (++i < n) { // Find the first comparable value.
      if ((value = valueof(values[i], i, values)) != null && value >= value) {
        min = max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = valueof(values[i], i, values)) != null) {
            if (min > value) min = value;
            if (max < value) max = value;
          }
        }
      }
    }
  }

  return [min, max];
};

var identity$3 = function(x) {
  return x;
};

var sequence = function(start, stop, step) {
  start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;

  var i = -1,
      n = Math.max(0, Math.ceil((stop - start) / step)) | 0,
      range = new Array(n);

  while (++i < n) {
    range[i] = start + i * step;
  }

  return range;
};

var e10$1 = Math.sqrt(50);
var e5$1 = Math.sqrt(10);
var e2$1 = Math.sqrt(2);

var ticks$1 = function(start, stop, count) {
  var reverse,
      i = -1,
      n,
      ticks,
      step;

  stop = +stop, start = +start, count = +count;
  if (start === stop && count > 0) return [start];
  if (reverse = stop < start) n = start, start = stop, stop = n;
  if ((step = tickIncrement$1(start, stop, count)) === 0 || !isFinite(step)) return [];

  if (step > 0) {
    start = Math.ceil(start / step);
    stop = Math.floor(stop / step);
    ticks = new Array(n = Math.ceil(stop - start + 1));
    while (++i < n) ticks[i] = (start + i) * step;
  } else {
    start = Math.floor(start * step);
    stop = Math.ceil(stop * step);
    ticks = new Array(n = Math.ceil(start - stop + 1));
    while (++i < n) ticks[i] = (start - i) / step;
  }

  if (reverse) ticks.reverse();

  return ticks;
};

function tickIncrement$1(start, stop, count) {
  var step = (stop - start) / Math.max(0, count),
      power = Math.floor(Math.log(step) / Math.LN10),
      error = step / Math.pow(10, power);
  return power >= 0
      ? (error >= e10$1 ? 10 : error >= e5$1 ? 5 : error >= e2$1 ? 2 : 1) * Math.pow(10, power)
      : -Math.pow(10, -power) / (error >= e10$1 ? 10 : error >= e5$1 ? 5 : error >= e2$1 ? 2 : 1);
}

function tickStep$1(start, stop, count) {
  var step0 = Math.abs(stop - start) / Math.max(0, count),
      step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
      error = step0 / step1;
  if (error >= e10$1) step1 *= 10;
  else if (error >= e5$1) step1 *= 5;
  else if (error >= e2$1) step1 *= 2;
  return stop < start ? -step1 : step1;
}

var sturges$1 = function(values) {
  return Math.ceil(Math.log(values.length) / Math.LN2) + 1;
};

var threshold = function(values, p, valueof) {
  if (valueof == null) valueof = number$2;
  if (!(n = values.length)) return;
  if ((p = +p) <= 0 || n < 2) return +valueof(values[0], 0, values);
  if (p >= 1) return +valueof(values[n - 1], n - 1, values);
  var n,
      i = (n - 1) * p,
      i0 = Math.floor(i),
      value0 = +valueof(values[i0], i0, values),
      value1 = +valueof(values[i0 + 1], i0 + 1, values);
  return value0 + (value1 - value0) * (i - i0);
};

var merge$1 = function(arrays) {
  var n = arrays.length,
      m,
      i = -1,
      j = 0,
      merged,
      array;

  while (++i < n) j += arrays[i].length;
  merged = new Array(j);

  while (--n >= 0) {
    array = arrays[n];
    m = array.length;
    while (--m >= 0) {
      merged[--j] = array[m];
    }
  }

  return merged;
};

var min$1 = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      min;

  if (valueof == null) {
    while (++i < n) { // Find the first comparable value.
      if ((value = values[i]) != null && value >= value) {
        min = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = values[i]) != null && min > value) {
            min = value;
          }
        }
      }
    }
  }

  else {
    while (++i < n) { // Find the first comparable value.
      if ((value = valueof(values[i], i, values)) != null && value >= value) {
        min = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = valueof(values[i], i, values)) != null && min > value) {
            min = value;
          }
        }
      }
    }
  }

  return min;
};

var sum$1 = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      sum = 0;

  if (valueof == null) {
    while (++i < n) {
      if (value = +values[i]) sum += value; // Note: zero and null are equivalent.
    }
  }

  else {
    while (++i < n) {
      if (value = +valueof(values[i], i, values)) sum += value;
    }
  }

  return sum;
};

function length$1(d) {
  return d.length;
}

var cos = Math.cos;
var sin = Math.sin;
var pi$1 = Math.PI;
var halfPi$1 = pi$1 / 2;
var tau$1 = pi$1 * 2;
var max$2 = Math.max;

function compareValue(compare) {
  return function(a, b) {
    return compare(
      a.source.value + a.target.value,
      b.source.value + b.target.value
    );
  };
}

var chord = function() {
  var padAngle = 0,
      sortGroups = null,
      sortSubgroups = null,
      sortChords = null;

  function chord(matrix) {
    var n = matrix.length,
        groupSums = [],
        groupIndex = sequence(n),
        subgroupIndex = [],
        chords = [],
        groups = chords.groups = new Array(n),
        subgroups = new Array(n * n),
        k,
        x,
        x0,
        dx,
        i,
        j;

    // Compute the sum.
    k = 0, i = -1; while (++i < n) {
      x = 0, j = -1; while (++j < n) {
        x += matrix[i][j];
      }
      groupSums.push(x);
      subgroupIndex.push(sequence(n));
      k += x;
    }

    // Sort groups…
    if (sortGroups) groupIndex.sort(function(a, b) {
      return sortGroups(groupSums[a], groupSums[b]);
    });

    // Sort subgroups…
    if (sortSubgroups) subgroupIndex.forEach(function(d, i) {
      d.sort(function(a, b) {
        return sortSubgroups(matrix[i][a], matrix[i][b]);
      });
    });

    // Convert the sum to scaling factor for [0, 2pi].
    // TODO Allow start and end angle to be specified?
    // TODO Allow padding to be specified as percentage?
    k = max$2(0, tau$1 - padAngle * n) / k;
    dx = k ? padAngle : tau$1 / n;

    // Compute the start and end angle for each group and subgroup.
    // Note: Opera has a bug reordering object literal properties!
    x = 0, i = -1; while (++i < n) {
      x0 = x, j = -1; while (++j < n) {
        var di = groupIndex[i],
            dj = subgroupIndex[di][j],
            v = matrix[di][dj],
            a0 = x,
            a1 = x += v * k;
        subgroups[dj * n + di] = {
          index: di,
          subindex: dj,
          startAngle: a0,
          endAngle: a1,
          value: v
        };
      }
      groups[di] = {
        index: di,
        startAngle: x0,
        endAngle: x,
        value: groupSums[di]
      };
      x += dx;
    }

    // Generate chords for each (non-empty) subgroup-subgroup link.
    i = -1; while (++i < n) {
      j = i - 1; while (++j < n) {
        var source = subgroups[j * n + i],
            target = subgroups[i * n + j];
        if (source.value || target.value) {
          chords.push(source.value < target.value
              ? {source: target, target: source}
              : {source: source, target: target});
        }
      }
    }

    return sortChords ? chords.sort(sortChords) : chords;
  }

  chord.padAngle = function(_) {
    return arguments.length ? (padAngle = max$2(0, _), chord) : padAngle;
  };

  chord.sortGroups = function(_) {
    return arguments.length ? (sortGroups = _, chord) : sortGroups;
  };

  chord.sortSubgroups = function(_) {
    return arguments.length ? (sortSubgroups = _, chord) : sortSubgroups;
  };

  chord.sortChords = function(_) {
    return arguments.length ? (_ == null ? sortChords = null : (sortChords = compareValue(_))._ = _, chord) : sortChords && sortChords._;
  };

  return chord;
};

var slice$3 = Array.prototype.slice;

var constant$6 = function(x) {
  return function() {
    return x;
  };
};

var pi$2 = Math.PI;
var tau$2 = 2 * pi$2;
var epsilon$1 = 1e-6;
var tauEpsilon = tau$2 - epsilon$1;

function Path() {
  this._x0 = this._y0 = // start of current subpath
  this._x1 = this._y1 = null; // end of current subpath
  this._ = "";
}

function path() {
  return new Path;
}

Path.prototype = path.prototype = {
  constructor: Path,
  moveTo: function(x, y) {
    this._ += "M" + (this._x0 = this._x1 = +x) + "," + (this._y0 = this._y1 = +y);
  },
  closePath: function() {
    if (this._x1 !== null) {
      this._x1 = this._x0, this._y1 = this._y0;
      this._ += "Z";
    }
  },
  lineTo: function(x, y) {
    this._ += "L" + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  quadraticCurveTo: function(x1, y1, x, y) {
    this._ += "Q" + (+x1) + "," + (+y1) + "," + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  bezierCurveTo: function(x1, y1, x2, y2, x, y) {
    this._ += "C" + (+x1) + "," + (+y1) + "," + (+x2) + "," + (+y2) + "," + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  arcTo: function(x1, y1, x2, y2, r) {
    x1 = +x1, y1 = +y1, x2 = +x2, y2 = +y2, r = +r;
    var x0 = this._x1,
        y0 = this._y1,
        x21 = x2 - x1,
        y21 = y2 - y1,
        x01 = x0 - x1,
        y01 = y0 - y1,
        l01_2 = x01 * x01 + y01 * y01;

    // Is the radius negative? Error.
    if (r < 0) throw new Error("negative radius: " + r);

    // Is this path empty? Move to (x1,y1).
    if (this._x1 === null) {
      this._ += "M" + (this._x1 = x1) + "," + (this._y1 = y1);
    }

    // Or, is (x1,y1) coincident with (x0,y0)? Do nothing.
    else if (!(l01_2 > epsilon$1)) {}

    // Or, are (x0,y0), (x1,y1) and (x2,y2) collinear?
    // Equivalently, is (x1,y1) coincident with (x2,y2)?
    // Or, is the radius zero? Line to (x1,y1).
    else if (!(Math.abs(y01 * x21 - y21 * x01) > epsilon$1) || !r) {
      this._ += "L" + (this._x1 = x1) + "," + (this._y1 = y1);
    }

    // Otherwise, draw an arc!
    else {
      var x20 = x2 - x0,
          y20 = y2 - y0,
          l21_2 = x21 * x21 + y21 * y21,
          l20_2 = x20 * x20 + y20 * y20,
          l21 = Math.sqrt(l21_2),
          l01 = Math.sqrt(l01_2),
          l = r * Math.tan((pi$2 - Math.acos((l21_2 + l01_2 - l20_2) / (2 * l21 * l01))) / 2),
          t01 = l / l01,
          t21 = l / l21;

      // If the start tangent is not coincident with (x0,y0), line to.
      if (Math.abs(t01 - 1) > epsilon$1) {
        this._ += "L" + (x1 + t01 * x01) + "," + (y1 + t01 * y01);
      }

      this._ += "A" + r + "," + r + ",0,0," + (+(y01 * x20 > x01 * y20)) + "," + (this._x1 = x1 + t21 * x21) + "," + (this._y1 = y1 + t21 * y21);
    }
  },
  arc: function(x, y, r, a0, a1, ccw) {
    x = +x, y = +y, r = +r;
    var dx = r * Math.cos(a0),
        dy = r * Math.sin(a0),
        x0 = x + dx,
        y0 = y + dy,
        cw = 1 ^ ccw,
        da = ccw ? a0 - a1 : a1 - a0;

    // Is the radius negative? Error.
    if (r < 0) throw new Error("negative radius: " + r);

    // Is this path empty? Move to (x0,y0).
    if (this._x1 === null) {
      this._ += "M" + x0 + "," + y0;
    }

    // Or, is (x0,y0) not coincident with the previous point? Line to (x0,y0).
    else if (Math.abs(this._x1 - x0) > epsilon$1 || Math.abs(this._y1 - y0) > epsilon$1) {
      this._ += "L" + x0 + "," + y0;
    }

    // Is this arc empty? We’re done.
    if (!r) return;

    // Does the angle go the wrong way? Flip the direction.
    if (da < 0) da = da % tau$2 + tau$2;

    // Is this a complete circle? Draw two arcs to complete the circle.
    if (da > tauEpsilon) {
      this._ += "A" + r + "," + r + ",0,1," + cw + "," + (x - dx) + "," + (y - dy) + "A" + r + "," + r + ",0,1," + cw + "," + (this._x1 = x0) + "," + (this._y1 = y0);
    }

    // Is this arc non-empty? Draw an arc!
    else if (da > epsilon$1) {
      this._ += "A" + r + "," + r + ",0," + (+(da >= pi$2)) + "," + cw + "," + (this._x1 = x + r * Math.cos(a1)) + "," + (this._y1 = y + r * Math.sin(a1));
    }
  },
  rect: function(x, y, w, h) {
    this._ += "M" + (this._x0 = this._x1 = +x) + "," + (this._y0 = this._y1 = +y) + "h" + (+w) + "v" + (+h) + "h" + (-w) + "Z";
  },
  toString: function() {
    return this._;
  }
};

function defaultSource(d) {
  return d.source;
}

function defaultTarget(d) {
  return d.target;
}

function defaultRadius(d) {
  return d.radius;
}

function defaultStartAngle(d) {
  return d.startAngle;
}

function defaultEndAngle(d) {
  return d.endAngle;
}

var ribbon = function() {
  var source = defaultSource,
      target = defaultTarget,
      radius = defaultRadius,
      startAngle = defaultStartAngle,
      endAngle = defaultEndAngle,
      context = null;

  function ribbon() {
    var buffer,
        argv = slice$3.call(arguments),
        s = source.apply(this, argv),
        t = target.apply(this, argv),
        sr = +radius.apply(this, (argv[0] = s, argv)),
        sa0 = startAngle.apply(this, argv) - halfPi$1,
        sa1 = endAngle.apply(this, argv) - halfPi$1,
        sx0 = sr * cos(sa0),
        sy0 = sr * sin(sa0),
        tr = +radius.apply(this, (argv[0] = t, argv)),
        ta0 = startAngle.apply(this, argv) - halfPi$1,
        ta1 = endAngle.apply(this, argv) - halfPi$1;

    if (!context) context = buffer = path();

    context.moveTo(sx0, sy0);
    context.arc(0, 0, sr, sa0, sa1);
    if (sa0 !== ta0 || sa1 !== ta1) { // TODO sr !== tr?
      context.quadraticCurveTo(0, 0, tr * cos(ta0), tr * sin(ta0));
      context.arc(0, 0, tr, ta0, ta1);
    }
    context.quadraticCurveTo(0, 0, sx0, sy0);
    context.closePath();

    if (buffer) return context = null, buffer + "" || null;
  }

  ribbon.radius = function(_) {
    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$6(+_), ribbon) : radius;
  };

  ribbon.startAngle = function(_) {
    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$6(+_), ribbon) : startAngle;
  };

  ribbon.endAngle = function(_) {
    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$6(+_), ribbon) : endAngle;
  };

  ribbon.source = function(_) {
    return arguments.length ? (source = _, ribbon) : source;
  };

  ribbon.target = function(_) {
    return arguments.length ? (target = _, ribbon) : target;
  };

  ribbon.context = function(_) {
    return arguments.length ? ((context = _ == null ? null : _), ribbon) : context;
  };

  return ribbon;
};

var prefix = "$";

function Map() {}

Map.prototype = map$2.prototype = {
  constructor: Map,
  has: function(key) {
    return (prefix + key) in this;
  },
  get: function(key) {
    return this[prefix + key];
  },
  set: function(key, value) {
    this[prefix + key] = value;
    return this;
  },
  remove: function(key) {
    var property = prefix + key;
    return property in this && delete this[property];
  },
  clear: function() {
    for (var property in this) if (property[0] === prefix) delete this[property];
  },
  keys: function() {
    var keys = [];
    for (var property in this) if (property[0] === prefix) keys.push(property.slice(1));
    return keys;
  },
  values: function() {
    var values = [];
    for (var property in this) if (property[0] === prefix) values.push(this[property]);
    return values;
  },
  entries: function() {
    var entries = [];
    for (var property in this) if (property[0] === prefix) entries.push({key: property.slice(1), value: this[property]});
    return entries;
  },
  size: function() {
    var size = 0;
    for (var property in this) if (property[0] === prefix) ++size;
    return size;
  },
  empty: function() {
    for (var property in this) if (property[0] === prefix) return false;
    return true;
  },
  each: function(f) {
    for (var property in this) if (property[0] === prefix) f(this[property], property.slice(1), this);
  }
};

function map$2(object, f) {
  var map = new Map;

  // Copy constructor.
  if (object instanceof Map) object.each(function(value, key) { map.set(key, value); });

  // Index array by numeric index or specified key function.
  else if (Array.isArray(object)) {
    var i = -1,
        n = object.length,
        o;

    if (f == null) while (++i < n) map.set(i, object[i]);
    else while (++i < n) map.set(f(o = object[i], i, object), o);
  }

  // Convert object to map.
  else if (object) for (var key in object) map.set(key, object[key]);

  return map;
}

var nest = function() {
  var keys = [],
      sortKeys = [],
      sortValues,
      rollup,
      nest;

  function apply(array, depth, createResult, setResult) {
    if (depth >= keys.length) {
      if (sortValues != null) array.sort(sortValues);
      return rollup != null ? rollup(array) : array;
    }

    var i = -1,
        n = array.length,
        key = keys[depth++],
        keyValue,
        value,
        valuesByKey = map$2(),
        values,
        result = createResult();

    while (++i < n) {
      if (values = valuesByKey.get(keyValue = key(value = array[i]) + "")) {
        values.push(value);
      } else {
        valuesByKey.set(keyValue, [value]);
      }
    }

    valuesByKey.each(function(values, key) {
      setResult(result, key, apply(values, depth, createResult, setResult));
    });

    return result;
  }

  function entries(map, depth) {
    if (++depth > keys.length) return map;
    var array, sortKey = sortKeys[depth - 1];
    if (rollup != null && depth >= keys.length) array = map.entries();
    else array = [], map.each(function(v, k) { array.push({key: k, values: entries(v, depth)}); });
    return sortKey != null ? array.sort(function(a, b) { return sortKey(a.key, b.key); }) : array;
  }

  return nest = {
    object: function(array) { return apply(array, 0, createObject, setObject); },
    map: function(array) { return apply(array, 0, createMap, setMap); },
    entries: function(array) { return entries(apply(array, 0, createMap, setMap), 0); },
    key: function(d) { keys.push(d); return nest; },
    sortKeys: function(order) { sortKeys[keys.length - 1] = order; return nest; },
    sortValues: function(order) { sortValues = order; return nest; },
    rollup: function(f) { rollup = f; return nest; }
  };
};

function createObject() {
  return {};
}

function setObject(object, key, value) {
  object[key] = value;
}

function createMap() {
  return map$2();
}

function setMap(map, key, value) {
  map.set(key, value);
}

function Set() {}

var proto = map$2.prototype;

Set.prototype = set$2.prototype = {
  constructor: Set,
  has: proto.has,
  add: function(value) {
    value += "";
    this[prefix + value] = value;
    return this;
  },
  remove: proto.remove,
  clear: proto.clear,
  values: proto.keys,
  size: proto.size,
  empty: proto.empty,
  each: proto.each
};

function set$2(object, f) {
  var set = new Set;

  // Copy constructor.
  if (object instanceof Set) object.each(function(value) { set.add(value); });

  // Otherwise, assume it’s an array.
  else if (object) {
    var i = -1, n = object.length;
    if (f == null) while (++i < n) set.add(object[i]);
    else while (++i < n) set.add(f(object[i], i, object));
  }

  return set;
}

var d3keys = function(map) {
  var keys = [];
  for (var key in map) keys.push(key);
  return keys;
};

var values = function(map) {
  var values = [];
  for (var key in map) values.push(map[key]);
  return values;
};

var entries = function(map) {
  var entries = [];
  for (var key in map) entries.push({key: key, value: map[key]});
  return entries;
};

var EOL = {};
var EOF = {};
var QUOTE = 34;
var NEWLINE = 10;
var RETURN = 13;

function objectConverter(columns) {
  return new Function("d", "return {" + columns.map(function(name, i) {
    return JSON.stringify(name) + ": d[" + i + "]";
  }).join(",") + "}");
}

function customConverter(columns, f) {
  var object = objectConverter(columns);
  return function(row, i) {
    return f(object(row), i, columns);
  };
}

// Compute unique columns in order of discovery.
function inferColumns(rows) {
  var columnSet = Object.create(null),
      columns = [];

  rows.forEach(function(row) {
    for (var column in row) {
      if (!(column in columnSet)) {
        columns.push(columnSet[column] = column);
      }
    }
  });

  return columns;
}

var dsv = function(delimiter) {
  var reFormat = new RegExp("[\"" + delimiter + "\n\r]"),
      DELIMITER = delimiter.charCodeAt(0);

  function parse(text, f) {
    var convert, columns, rows = parseRows(text, function(row, i) {
      if (convert) return convert(row, i - 1);
      columns = row, convert = f ? customConverter(row, f) : objectConverter(row);
    });
    rows.columns = columns;
    return rows;
  }

  function parseRows(text, f) {
    var rows = [], // output rows
        N = text.length,
        I = 0, // current character index
        n = 0, // current line number
        t, // current token
        eof = N <= 0, // current token followed by EOF?
        eol = false; // current token followed by EOL?

    // Strip the trailing newline.
    if (text.charCodeAt(N - 1) === NEWLINE) --N;
    if (text.charCodeAt(N - 1) === RETURN) --N;

    function token() {
      if (eof) return EOF;
      if (eol) return eol = false, EOL;

      // Unescape quotes.
      var i, j = I, c;
      if (text.charCodeAt(j) === QUOTE) {
        while (I++ < N && text.charCodeAt(I) !== QUOTE || text.charCodeAt(++I) === QUOTE);
        if ((i = I) >= N) eof = true;
        else if ((c = text.charCodeAt(I++)) === NEWLINE) eol = true;
        else if (c === RETURN) { eol = true; if (text.charCodeAt(I) === NEWLINE) ++I; }
        return text.slice(j + 1, i - 1).replace(/""/g, "\"");
      }

      // Find next delimiter or newline.
      while (I < N) {
        if ((c = text.charCodeAt(i = I++)) === NEWLINE) eol = true;
        else if (c === RETURN) { eol = true; if (text.charCodeAt(I) === NEWLINE) ++I; }
        else if (c !== DELIMITER) continue;
        return text.slice(j, i);
      }

      // Return last token before EOF.
      return eof = true, text.slice(j, N);
    }

    while ((t = token()) !== EOF) {
      var row = [];
      while (t !== EOL && t !== EOF) row.push(t), t = token();
      if (f && (row = f(row, n++)) == null) continue;
      rows.push(row);
    }

    return rows;
  }

  function format(rows, columns) {
    if (columns == null) columns = inferColumns(rows);
    return [columns.map(formatValue).join(delimiter)].concat(rows.map(function(row) {
      return columns.map(function(column) {
        return formatValue(row[column]);
      }).join(delimiter);
    })).join("\n");
  }

  function formatRows(rows) {
    return rows.map(formatRow).join("\n");
  }

  function formatRow(row) {
    return row.map(formatValue).join(delimiter);
  }

  function formatValue(text) {
    return text == null ? ""
        : reFormat.test(text += "") ? "\"" + text.replace(/"/g, "\"\"") + "\""
        : text;
  }

  return {
    parse: parse,
    parseRows: parseRows,
    format: format,
    formatRows: formatRows
  };
};

var csv = dsv(",");

var csvParse = csv.parse;
var csvParseRows = csv.parseRows;
var csvFormat = csv.format;
var csvFormatRows = csv.formatRows;

var tsv = dsv("\t");

var tsvParse = tsv.parse;
var tsvParseRows = tsv.parseRows;
var tsvFormat = tsv.format;
var tsvFormatRows = tsv.formatRows;

var center$1 = function(x, y) {
  var nodes;

  if (x == null) x = 0;
  if (y == null) y = 0;

  function force() {
    var i,
        n = nodes.length,
        node,
        sx = 0,
        sy = 0;

    for (i = 0; i < n; ++i) {
      node = nodes[i], sx += node.x, sy += node.y;
    }

    for (sx = sx / n - x, sy = sy / n - y, i = 0; i < n; ++i) {
      node = nodes[i], node.x -= sx, node.y -= sy;
    }
  }

  force.initialize = function(_) {
    nodes = _;
  };

  force.x = function(_) {
    return arguments.length ? (x = +_, force) : x;
  };

  force.y = function(_) {
    return arguments.length ? (y = +_, force) : y;
  };

  return force;
};

var constant$7 = function(x) {
  return function() {
    return x;
  };
};

var jiggle = function() {
  return (Math.random() - 0.5) * 1e-6;
};

var tree_add = function(d) {
  var x = +this._x.call(null, d),
      y = +this._y.call(null, d);
  return add(this.cover(x, y), x, y, d);
};

function add(tree, x, y, d) {
  if (isNaN(x) || isNaN(y)) return tree; // ignore invalid points

  var parent,
      node = tree._root,
      leaf = {data: d},
      x0 = tree._x0,
      y0 = tree._y0,
      x1 = tree._x1,
      y1 = tree._y1,
      xm,
      ym,
      xp,
      yp,
      right,
      bottom,
      i,
      j;

  // If the tree is empty, initialize the root as a leaf.
  if (!node) return tree._root = leaf, tree;

  // Find the existing leaf for the new point, or add it.
  while (node.length) {
    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
    if (parent = node, !(node = node[i = bottom << 1 | right])) return parent[i] = leaf, tree;
  }

  // Is the new point is exactly coincident with the existing point?
  xp = +tree._x.call(null, node.data);
  yp = +tree._y.call(null, node.data);
  if (x === xp && y === yp) return leaf.next = node, parent ? parent[i] = leaf : tree._root = leaf, tree;

  // Otherwise, split the leaf node until the old and new point are separated.
  do {
    parent = parent ? parent[i] = new Array(4) : tree._root = new Array(4);
    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
  } while ((i = bottom << 1 | right) === (j = (yp >= ym) << 1 | (xp >= xm)));
  return parent[j] = node, parent[i] = leaf, tree;
}

function addAll(data) {
  var d, i, n = data.length,
      x,
      y,
      xz = new Array(n),
      yz = new Array(n),
      x0 = Infinity,
      y0 = Infinity,
      x1 = -Infinity,
      y1 = -Infinity;

  // Compute the points and their extent.
  for (i = 0; i < n; ++i) {
    if (isNaN(x = +this._x.call(null, d = data[i])) || isNaN(y = +this._y.call(null, d))) continue;
    xz[i] = x;
    yz[i] = y;
    if (x < x0) x0 = x;
    if (x > x1) x1 = x;
    if (y < y0) y0 = y;
    if (y > y1) y1 = y;
  }

  // If there were no (valid) points, inherit the existing extent.
  if (x1 < x0) x0 = this._x0, x1 = this._x1;
  if (y1 < y0) y0 = this._y0, y1 = this._y1;

  // Expand the tree to cover the new points.
  this.cover(x0, y0).cover(x1, y1);

  // Add the new points.
  for (i = 0; i < n; ++i) {
    add(this, xz[i], yz[i], data[i]);
  }

  return this;
}

var tree_cover = function(x, y) {
  if (isNaN(x = +x) || isNaN(y = +y)) return this; // ignore invalid points

  var x0 = this._x0,
      y0 = this._y0,
      x1 = this._x1,
      y1 = this._y1;

  // If the quadtree has no extent, initialize them.
  // Integer extent are necessary so that if we later double the extent,
  // the existing quadrant boundaries don’t change due to floating point error!
  if (isNaN(x0)) {
    x1 = (x0 = Math.floor(x)) + 1;
    y1 = (y0 = Math.floor(y)) + 1;
  }

  // Otherwise, double repeatedly to cover.
  else if (x0 > x || x > x1 || y0 > y || y > y1) {
    var z = x1 - x0,
        node = this._root,
        parent,
        i;

    switch (i = (y < (y0 + y1) / 2) << 1 | (x < (x0 + x1) / 2)) {
      case 0: {
        do parent = new Array(4), parent[i] = node, node = parent;
        while (z *= 2, x1 = x0 + z, y1 = y0 + z, x > x1 || y > y1);
        break;
      }
      case 1: {
        do parent = new Array(4), parent[i] = node, node = parent;
        while (z *= 2, x0 = x1 - z, y1 = y0 + z, x0 > x || y > y1);
        break;
      }
      case 2: {
        do parent = new Array(4), parent[i] = node, node = parent;
        while (z *= 2, x1 = x0 + z, y0 = y1 - z, x > x1 || y0 > y);
        break;
      }
      case 3: {
        do parent = new Array(4), parent[i] = node, node = parent;
        while (z *= 2, x0 = x1 - z, y0 = y1 - z, x0 > x || y0 > y);
        break;
      }
    }

    if (this._root && this._root.length) this._root = node;
  }

  // If the quadtree covers the point already, just return.
  else return this;

  this._x0 = x0;
  this._y0 = y0;
  this._x1 = x1;
  this._y1 = y1;
  return this;
};

var tree_data = function() {
  var data = [];
  this.visit(function(node) {
    if (!node.length) do data.push(node.data); while (node = node.next)
  });
  return data;
};

var tree_extent = function(_) {
  return arguments.length
      ? this.cover(+_[0][0], +_[0][1]).cover(+_[1][0], +_[1][1])
      : isNaN(this._x0) ? undefined : [[this._x0, this._y0], [this._x1, this._y1]];
};

var Quad = function(node, x0, y0, x1, y1) {
  this.node = node;
  this.x0 = x0;
  this.y0 = y0;
  this.x1 = x1;
  this.y1 = y1;
};

var tree_find = function(x, y, radius) {
  var data,
      x0 = this._x0,
      y0 = this._y0,
      x1,
      y1,
      x2,
      y2,
      x3 = this._x1,
      y3 = this._y1,
      quads = [],
      node = this._root,
      q,
      i;

  if (node) quads.push(new Quad(node, x0, y0, x3, y3));
  if (radius == null) radius = Infinity;
  else {
    x0 = x - radius, y0 = y - radius;
    x3 = x + radius, y3 = y + radius;
    radius *= radius;
  }

  while (q = quads.pop()) {

    // Stop searching if this quadrant can’t contain a closer node.
    if (!(node = q.node)
        || (x1 = q.x0) > x3
        || (y1 = q.y0) > y3
        || (x2 = q.x1) < x0
        || (y2 = q.y1) < y0) continue;

    // Bisect the current quadrant.
    if (node.length) {
      var xm = (x1 + x2) / 2,
          ym = (y1 + y2) / 2;

      quads.push(
        new Quad(node[3], xm, ym, x2, y2),
        new Quad(node[2], x1, ym, xm, y2),
        new Quad(node[1], xm, y1, x2, ym),
        new Quad(node[0], x1, y1, xm, ym)
      );

      // Visit the closest quadrant first.
      if (i = (y >= ym) << 1 | (x >= xm)) {
        q = quads[quads.length - 1];
        quads[quads.length - 1] = quads[quads.length - 1 - i];
        quads[quads.length - 1 - i] = q;
      }
    }

    // Visit this point. (Visiting coincident points isn’t necessary!)
    else {
      var dx = x - +this._x.call(null, node.data),
          dy = y - +this._y.call(null, node.data),
          d2 = dx * dx + dy * dy;
      if (d2 < radius) {
        var d = Math.sqrt(radius = d2);
        x0 = x - d, y0 = y - d;
        x3 = x + d, y3 = y + d;
        data = node.data;
      }
    }
  }

  return data;
};

var tree_remove = function(d) {
  if (isNaN(x = +this._x.call(null, d)) || isNaN(y = +this._y.call(null, d))) return this; // ignore invalid points

  var parent,
      node = this._root,
      retainer,
      previous,
      next,
      x0 = this._x0,
      y0 = this._y0,
      x1 = this._x1,
      y1 = this._y1,
      x,
      y,
      xm,
      ym,
      right,
      bottom,
      i,
      j;

  // If the tree is empty, initialize the root as a leaf.
  if (!node) return this;

  // Find the leaf node for the point.
  // While descending, also retain the deepest parent with a non-removed sibling.
  if (node.length) while (true) {
    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
    if (!(parent = node, node = node[i = bottom << 1 | right])) return this;
    if (!node.length) break;
    if (parent[(i + 1) & 3] || parent[(i + 2) & 3] || parent[(i + 3) & 3]) retainer = parent, j = i;
  }

  // Find the point to remove.
  while (node.data !== d) if (!(previous = node, node = node.next)) return this;
  if (next = node.next) delete node.next;

  // If there are multiple coincident points, remove just the point.
  if (previous) return (next ? previous.next = next : delete previous.next), this;

  // If this is the root point, remove it.
  if (!parent) return this._root = next, this;

  // Remove this leaf.
  next ? parent[i] = next : delete parent[i];

  // If the parent now contains exactly one leaf, collapse superfluous parents.
  if ((node = parent[0] || parent[1] || parent[2] || parent[3])
      && node === (parent[3] || parent[2] || parent[1] || parent[0])
      && !node.length) {
    if (retainer) retainer[j] = node;
    else this._root = node;
  }

  return this;
};

function removeAll(data) {
  for (var i = 0, n = data.length; i < n; ++i) this.remove(data[i]);
  return this;
}

var tree_root = function() {
  return this._root;
};

var tree_size = function() {
  var size = 0;
  this.visit(function(node) {
    if (!node.length) do ++size; while (node = node.next)
  });
  return size;
};

var tree_visit = function(callback) {
  var quads = [], q, node = this._root, child, x0, y0, x1, y1;
  if (node) quads.push(new Quad(node, this._x0, this._y0, this._x1, this._y1));
  while (q = quads.pop()) {
    if (!callback(node = q.node, x0 = q.x0, y0 = q.y0, x1 = q.x1, y1 = q.y1) && node.length) {
      var xm = (x0 + x1) / 2, ym = (y0 + y1) / 2;
      if (child = node[3]) quads.push(new Quad(child, xm, ym, x1, y1));
      if (child = node[2]) quads.push(new Quad(child, x0, ym, xm, y1));
      if (child = node[1]) quads.push(new Quad(child, xm, y0, x1, ym));
      if (child = node[0]) quads.push(new Quad(child, x0, y0, xm, ym));
    }
  }
  return this;
};

var tree_visitAfter = function(callback) {
  var quads = [], next = [], q;
  if (this._root) quads.push(new Quad(this._root, this._x0, this._y0, this._x1, this._y1));
  while (q = quads.pop()) {
    var node = q.node;
    if (node.length) {
      var child, x0 = q.x0, y0 = q.y0, x1 = q.x1, y1 = q.y1, xm = (x0 + x1) / 2, ym = (y0 + y1) / 2;
      if (child = node[0]) quads.push(new Quad(child, x0, y0, xm, ym));
      if (child = node[1]) quads.push(new Quad(child, xm, y0, x1, ym));
      if (child = node[2]) quads.push(new Quad(child, x0, ym, xm, y1));
      if (child = node[3]) quads.push(new Quad(child, xm, ym, x1, y1));
    }
    next.push(q);
  }
  while (q = next.pop()) {
    callback(q.node, q.x0, q.y0, q.x1, q.y1);
  }
  return this;
};

function defaultX(d) {
  return d[0];
}

var tree_x = function(_) {
  return arguments.length ? (this._x = _, this) : this._x;
};

function defaultY(d) {
  return d[1];
}

var tree_y = function(_) {
  return arguments.length ? (this._y = _, this) : this._y;
};

function quadtree(nodes, x, y) {
  var tree = new Quadtree(x == null ? defaultX : x, y == null ? defaultY : y, NaN, NaN, NaN, NaN);
  return nodes == null ? tree : tree.addAll(nodes);
}

function Quadtree(x, y, x0, y0, x1, y1) {
  this._x = x;
  this._y = y;
  this._x0 = x0;
  this._y0 = y0;
  this._x1 = x1;
  this._y1 = y1;
  this._root = undefined;
}

function leaf_copy(leaf) {
  var copy = {data: leaf.data}, next = copy;
  while (leaf = leaf.next) next = next.next = {data: leaf.data};
  return copy;
}

var treeProto = quadtree.prototype = Quadtree.prototype;

treeProto.copy = function() {
  var copy = new Quadtree(this._x, this._y, this._x0, this._y0, this._x1, this._y1),
      node = this._root,
      nodes,
      child;

  if (!node) return copy;

  if (!node.length) return copy._root = leaf_copy(node), copy;

  nodes = [{source: node, target: copy._root = new Array(4)}];
  while (node = nodes.pop()) {
    for (var i = 0; i < 4; ++i) {
      if (child = node.source[i]) {
        if (child.length) nodes.push({source: child, target: node.target[i] = new Array(4)});
        else node.target[i] = leaf_copy(child);
      }
    }
  }

  return copy;
};

treeProto.add = tree_add;
treeProto.addAll = addAll;
treeProto.cover = tree_cover;
treeProto.data = tree_data;
treeProto.extent = tree_extent;
treeProto.find = tree_find;
treeProto.remove = tree_remove;
treeProto.removeAll = removeAll;
treeProto.root = tree_root;
treeProto.size = tree_size;
treeProto.visit = tree_visit;
treeProto.visitAfter = tree_visitAfter;
treeProto.x = tree_x;
treeProto.y = tree_y;

function x(d) {
  return d.x + d.vx;
}

function y(d) {
  return d.y + d.vy;
}

var collide = function(radius) {
  var nodes,
      radii,
      strength = 1,
      iterations = 1;

  if (typeof radius !== "function") radius = constant$7(radius == null ? 1 : +radius);

  function force() {
    var i, n = nodes.length,
        tree,
        node,
        xi,
        yi,
        ri,
        ri2;

    for (var k = 0; k < iterations; ++k) {
      tree = quadtree(nodes, x, y).visitAfter(prepare);
      for (i = 0; i < n; ++i) {
        node = nodes[i];
        ri = radii[node.index], ri2 = ri * ri;
        xi = node.x + node.vx;
        yi = node.y + node.vy;
        tree.visit(apply);
      }
    }

    function apply(quad, x0, y0, x1, y1) {
      var data = quad.data, rj = quad.r, r = ri + rj;
      if (data) {
        if (data.index > node.index) {
          var x = xi - data.x - data.vx,
              y = yi - data.y - data.vy,
              l = x * x + y * y;
          if (l < r * r) {
            if (x === 0) x = jiggle(), l += x * x;
            if (y === 0) y = jiggle(), l += y * y;
            l = (r - (l = Math.sqrt(l))) / l * strength;
            node.vx += (x *= l) * (r = (rj *= rj) / (ri2 + rj));
            node.vy += (y *= l) * r;
            data.vx -= x * (r = 1 - r);
            data.vy -= y * r;
          }
        }
        return;
      }
      return x0 > xi + r || x1 < xi - r || y0 > yi + r || y1 < yi - r;
    }
  }

  function prepare(quad) {
    if (quad.data) return quad.r = radii[quad.data.index];
    for (var i = quad.r = 0; i < 4; ++i) {
      if (quad[i] && quad[i].r > quad.r) {
        quad.r = quad[i].r;
      }
    }
  }

  function initialize() {
    if (!nodes) return;
    var i, n = nodes.length, node;
    radii = new Array(n);
    for (i = 0; i < n; ++i) node = nodes[i], radii[node.index] = +radius(node, i, nodes);
  }

  force.initialize = function(_) {
    nodes = _;
    initialize();
  };

  force.iterations = function(_) {
    return arguments.length ? (iterations = +_, force) : iterations;
  };

  force.strength = function(_) {
    return arguments.length ? (strength = +_, force) : strength;
  };

  force.radius = function(_) {
    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : radius;
  };

  return force;
};

function index(d) {
  return d.index;
}

function find(nodeById, nodeId) {
  var node = nodeById.get(nodeId);
  if (!node) throw new Error("missing: " + nodeId);
  return node;
}

var link = function(links) {
  var id = index,
      strength = defaultStrength,
      strengths,
      distance = constant$7(30),
      distances,
      nodes,
      count,
      bias,
      iterations = 1;

  if (links == null) links = [];

  function defaultStrength(link) {
    return 1 / Math.min(count[link.source.index], count[link.target.index]);
  }

  function force(alpha) {
    for (var k = 0, n = links.length; k < iterations; ++k) {
      for (var i = 0, link, source, target, x, y, l, b; i < n; ++i) {
        link = links[i], source = link.source, target = link.target;
        x = target.x + target.vx - source.x - source.vx || jiggle();
        y = target.y + target.vy - source.y - source.vy || jiggle();
        l = Math.sqrt(x * x + y * y);
        l = (l - distances[i]) / l * alpha * strengths[i];
        x *= l, y *= l;
        target.vx -= x * (b = bias[i]);
        target.vy -= y * b;
        source.vx += x * (b = 1 - b);
        source.vy += y * b;
      }
    }
  }

  function initialize() {
    if (!nodes) return;

    var i,
        n = nodes.length,
        m = links.length,
        nodeById = map$2(nodes, id),
        link;

    for (i = 0, count = new Array(n); i < m; ++i) {
      link = links[i], link.index = i;
      if (typeof link.source !== "object") link.source = find(nodeById, link.source);
      if (typeof link.target !== "object") link.target = find(nodeById, link.target);
      count[link.source.index] = (count[link.source.index] || 0) + 1;
      count[link.target.index] = (count[link.target.index] || 0) + 1;
    }

    for (i = 0, bias = new Array(m); i < m; ++i) {
      link = links[i], bias[i] = count[link.source.index] / (count[link.source.index] + count[link.target.index]);
    }

    strengths = new Array(m), initializeStrength();
    distances = new Array(m), initializeDistance();
  }

  function initializeStrength() {
    if (!nodes) return;

    for (var i = 0, n = links.length; i < n; ++i) {
      strengths[i] = +strength(links[i], i, links);
    }
  }

  function initializeDistance() {
    if (!nodes) return;

    for (var i = 0, n = links.length; i < n; ++i) {
      distances[i] = +distance(links[i], i, links);
    }
  }

  force.initialize = function(_) {
    nodes = _;
    initialize();
  };

  force.links = function(_) {
    return arguments.length ? (links = _, initialize(), force) : links;
  };

  force.id = function(_) {
    return arguments.length ? (id = _, force) : id;
  };

  force.iterations = function(_) {
    return arguments.length ? (iterations = +_, force) : iterations;
  };

  force.strength = function(_) {
    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$7(+_), initializeStrength(), force) : strength;
  };

  force.distance = function(_) {
    return arguments.length ? (distance = typeof _ === "function" ? _ : constant$7(+_), initializeDistance(), force) : distance;
  };

  return force;
};

function x$1(d) {
  return d.x;
}

function y$1(d) {
  return d.y;
}

var initialRadius = 10;
var initialAngle = Math.PI * (3 - Math.sqrt(5));

var simulation = function(nodes) {
  var simulation,
      alpha = 1,
      alphaMin = 0.001,
      alphaDecay = 1 - Math.pow(alphaMin, 1 / 300),
      alphaTarget = 0,
      velocityDecay = 0.6,
      forces = map$2(),
      stepper = timer(step),
      event = dispatch("tick", "end");

  if (nodes == null) nodes = [];

  function step() {
    tick();
    event.call("tick", simulation);
    if (alpha < alphaMin) {
      stepper.stop();
      event.call("end", simulation);
    }
  }

  function tick() {
    var i, n = nodes.length, node;

    alpha += (alphaTarget - alpha) * alphaDecay;

    forces.each(function(force) {
      force(alpha);
    });

    for (i = 0; i < n; ++i) {
      node = nodes[i];
      if (node.fx == null) node.x += node.vx *= velocityDecay;
      else node.x = node.fx, node.vx = 0;
      if (node.fy == null) node.y += node.vy *= velocityDecay;
      else node.y = node.fy, node.vy = 0;
    }
  }

  function initializeNodes() {
    for (var i = 0, n = nodes.length, node; i < n; ++i) {
      node = nodes[i], node.index = i;
      if (isNaN(node.x) || isNaN(node.y)) {
        var radius = initialRadius * Math.sqrt(i), angle = i * initialAngle;
        node.x = radius * Math.cos(angle);
        node.y = radius * Math.sin(angle);
      }
      if (isNaN(node.vx) || isNaN(node.vy)) {
        node.vx = node.vy = 0;
      }
    }
  }

  function initializeForce(force) {
    if (force.initialize) force.initialize(nodes);
    return force;
  }

  initializeNodes();

  return simulation = {
    tick: tick,

    restart: function() {
      return stepper.restart(step), simulation;
    },

    stop: function() {
      return stepper.stop(), simulation;
    },

    nodes: function(_) {
      return arguments.length ? (nodes = _, initializeNodes(), forces.each(initializeForce), simulation) : nodes;
    },

    alpha: function(_) {
      return arguments.length ? (alpha = +_, simulation) : alpha;
    },

    alphaMin: function(_) {
      return arguments.length ? (alphaMin = +_, simulation) : alphaMin;
    },

    alphaDecay: function(_) {
      return arguments.length ? (alphaDecay = +_, simulation) : +alphaDecay;
    },

    alphaTarget: function(_) {
      return arguments.length ? (alphaTarget = +_, simulation) : alphaTarget;
    },

    velocityDecay: function(_) {
      return arguments.length ? (velocityDecay = 1 - _, simulation) : 1 - velocityDecay;
    },

    force: function(name, _) {
      return arguments.length > 1 ? ((_ == null ? forces.remove(name) : forces.set(name, initializeForce(_))), simulation) : forces.get(name);
    },

    find: function(x, y, radius) {
      var i = 0,
          n = nodes.length,
          dx,
          dy,
          d2,
          node,
          closest;

      if (radius == null) radius = Infinity;
      else radius *= radius;

      for (i = 0; i < n; ++i) {
        node = nodes[i];
        dx = x - node.x;
        dy = y - node.y;
        d2 = dx * dx + dy * dy;
        if (d2 < radius) closest = node, radius = d2;
      }

      return closest;
    },

    on: function(name, _) {
      return arguments.length > 1 ? (event.on(name, _), simulation) : event.on(name);
    }
  };
};

var manyBody = function() {
  var nodes,
      node,
      alpha,
      strength = constant$7(-30),
      strengths,
      distanceMin2 = 1,
      distanceMax2 = Infinity,
      theta2 = 0.81;

  function force(_) {
    var i, n = nodes.length, tree = quadtree(nodes, x$1, y$1).visitAfter(accumulate);
    for (alpha = _, i = 0; i < n; ++i) node = nodes[i], tree.visit(apply);
  }

  function initialize() {
    if (!nodes) return;
    var i, n = nodes.length, node;
    strengths = new Array(n);
    for (i = 0; i < n; ++i) node = nodes[i], strengths[node.index] = +strength(node, i, nodes);
  }

  function accumulate(quad) {
    var strength = 0, q, c, x$$1, y$$1, i;

    // For internal nodes, accumulate forces from child quadrants.
    if (quad.length) {
      for (x$$1 = y$$1 = i = 0; i < 4; ++i) {
        if ((q = quad[i]) && (c = q.value)) {
          strength += c, x$$1 += c * q.x, y$$1 += c * q.y;
        }
      }
      quad.x = x$$1 / strength;
      quad.y = y$$1 / strength;
    }

    // For leaf nodes, accumulate forces from coincident quadrants.
    else {
      q = quad;
      q.x = q.data.x;
      q.y = q.data.y;
      do strength += strengths[q.data.index];
      while (q = q.next);
    }

    quad.value = strength;
  }

  function apply(quad, x1, _, x2) {
    if (!quad.value) return true;

    var x$$1 = quad.x - node.x,
        y$$1 = quad.y - node.y,
        w = x2 - x1,
        l = x$$1 * x$$1 + y$$1 * y$$1;

    // Apply the Barnes-Hut approximation if possible.
    // Limit forces for very close nodes; randomize direction if coincident.
    if (w * w / theta2 < l) {
      if (l < distanceMax2) {
        if (x$$1 === 0) x$$1 = jiggle(), l += x$$1 * x$$1;
        if (y$$1 === 0) y$$1 = jiggle(), l += y$$1 * y$$1;
        if (l < distanceMin2) l = Math.sqrt(distanceMin2 * l);
        node.vx += x$$1 * quad.value * alpha / l;
        node.vy += y$$1 * quad.value * alpha / l;
      }
      return true;
    }

    // Otherwise, process points directly.
    else if (quad.length || l >= distanceMax2) return;

    // Limit forces for very close nodes; randomize direction if coincident.
    if (quad.data !== node || quad.next) {
      if (x$$1 === 0) x$$1 = jiggle(), l += x$$1 * x$$1;
      if (y$$1 === 0) y$$1 = jiggle(), l += y$$1 * y$$1;
      if (l < distanceMin2) l = Math.sqrt(distanceMin2 * l);
    }

    do if (quad.data !== node) {
      w = strengths[quad.data.index] * alpha / l;
      node.vx += x$$1 * w;
      node.vy += y$$1 * w;
    } while (quad = quad.next);
  }

  force.initialize = function(_) {
    nodes = _;
    initialize();
  };

  force.strength = function(_) {
    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : strength;
  };

  force.distanceMin = function(_) {
    return arguments.length ? (distanceMin2 = _ * _, force) : Math.sqrt(distanceMin2);
  };

  force.distanceMax = function(_) {
    return arguments.length ? (distanceMax2 = _ * _, force) : Math.sqrt(distanceMax2);
  };

  force.theta = function(_) {
    return arguments.length ? (theta2 = _ * _, force) : Math.sqrt(theta2);
  };

  return force;
};

var x$2 = function(x) {
  var strength = constant$7(0.1),
      nodes,
      strengths,
      xz;

  if (typeof x !== "function") x = constant$7(x == null ? 0 : +x);

  function force(alpha) {
    for (var i = 0, n = nodes.length, node; i < n; ++i) {
      node = nodes[i], node.vx += (xz[i] - node.x) * strengths[i] * alpha;
    }
  }

  function initialize() {
    if (!nodes) return;
    var i, n = nodes.length;
    strengths = new Array(n);
    xz = new Array(n);
    for (i = 0; i < n; ++i) {
      strengths[i] = isNaN(xz[i] = +x(nodes[i], i, nodes)) ? 0 : +strength(nodes[i], i, nodes);
    }
  }

  force.initialize = function(_) {
    nodes = _;
    initialize();
  };

  force.strength = function(_) {
    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : strength;
  };

  force.x = function(_) {
    return arguments.length ? (x = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : x;
  };

  return force;
};

var y$2 = function(y) {
  var strength = constant$7(0.1),
      nodes,
      strengths,
      yz;

  if (typeof y !== "function") y = constant$7(y == null ? 0 : +y);

  function force(alpha) {
    for (var i = 0, n = nodes.length, node; i < n; ++i) {
      node = nodes[i], node.vy += (yz[i] - node.y) * strengths[i] * alpha;
    }
  }

  function initialize() {
    if (!nodes) return;
    var i, n = nodes.length;
    strengths = new Array(n);
    yz = new Array(n);
    for (i = 0; i < n; ++i) {
      strengths[i] = isNaN(yz[i] = +y(nodes[i], i, nodes)) ? 0 : +strength(nodes[i], i, nodes);
    }
  }

  force.initialize = function(_) {
    nodes = _;
    initialize();
  };

  force.strength = function(_) {
    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : strength;
  };

  force.y = function(_) {
    return arguments.length ? (y = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : y;
  };

  return force;
};

// Computes the decimal coefficient and exponent of the specified number x with
// significant digits p, where x is positive and p is in [1, 21] or undefined.
// For example, formatDecimal(1.23) returns ["123", 0].
var formatDecimal = function(x, p) {
  if ((i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf("e")) < 0) return null; // NaN, ±Infinity
  var i, coefficient = x.slice(0, i);

  // The string returned by toExponential either has the form \d\.\d+e[-+]\d+
  // (e.g., 1.2e+3) or the form \de[-+]\d+ (e.g., 1e+3).
  return [
    coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient,
    +x.slice(i + 1)
  ];
};

var exponent$1 = function(x) {
  return x = formatDecimal(Math.abs(x)), x ? x[1] : NaN;
};

var formatGroup = function(grouping, thousands) {
  return function(value, width) {
    var i = value.length,
        t = [],
        j = 0,
        g = grouping[0],
        length = 0;

    while (i > 0 && g > 0) {
      if (length + g + 1 > width) g = Math.max(1, width - length);
      t.push(value.substring(i -= g, i + g));
      if ((length += g + 1) > width) break;
      g = grouping[j = (j + 1) % grouping.length];
    }

    return t.reverse().join(thousands);
  };
};

var formatNumerals = function(numerals) {
  return function(value) {
    return value.replace(/[0-9]/g, function(i) {
      return numerals[+i];
    });
  };
};

var formatDefault = function(x, p) {
  x = x.toPrecision(p);

  out: for (var n = x.length, i = 1, i0 = -1, i1; i < n; ++i) {
    switch (x[i]) {
      case ".": i0 = i1 = i; break;
      case "0": if (i0 === 0) i0 = i; i1 = i; break;
      case "e": break out;
      default: if (i0 > 0) i0 = 0; break;
    }
  }

  return i0 > 0 ? x.slice(0, i0) + x.slice(i1 + 1) : x;
};

var prefixExponent;

var formatPrefixAuto = function(x, p) {
  var d = formatDecimal(x, p);
  if (!d) return x + "";
  var coefficient = d[0],
      exponent = d[1],
      i = exponent - (prefixExponent = Math.max(-8, Math.min(8, Math.floor(exponent / 3))) * 3) + 1,
      n = coefficient.length;
  return i === n ? coefficient
      : i > n ? coefficient + new Array(i - n + 1).join("0")
      : i > 0 ? coefficient.slice(0, i) + "." + coefficient.slice(i)
      : "0." + new Array(1 - i).join("0") + formatDecimal(x, Math.max(0, p + i - 1))[0]; // less than 1y!
};

var formatRounded = function(x, p) {
  var d = formatDecimal(x, p);
  if (!d) return x + "";
  var coefficient = d[0],
      exponent = d[1];
  return exponent < 0 ? "0." + new Array(-exponent).join("0") + coefficient
      : coefficient.length > exponent + 1 ? coefficient.slice(0, exponent + 1) + "." + coefficient.slice(exponent + 1)
      : coefficient + new Array(exponent - coefficient.length + 2).join("0");
};

var formatTypes = {
  "": formatDefault,
  "%": function(x, p) { return (x * 100).toFixed(p); },
  "b": function(x) { return Math.round(x).toString(2); },
  "c": function(x) { return x + ""; },
  "d": function(x) { return Math.round(x).toString(10); },
  "e": function(x, p) { return x.toExponential(p); },
  "f": function(x, p) { return x.toFixed(p); },
  "g": function(x, p) { return x.toPrecision(p); },
  "o": function(x) { return Math.round(x).toString(8); },
  "p": function(x, p) { return formatRounded(x * 100, p); },
  "r": formatRounded,
  "s": formatPrefixAuto,
  "X": function(x) { return Math.round(x).toString(16).toUpperCase(); },
  "x": function(x) { return Math.round(x).toString(16); }
};

// [[fill]align][sign][symbol][0][width][,][.precision][type]
var re = /^(?:(.)?([<>=^]))?([+\-\( ])?([$#])?(0)?(\d+)?(,)?(\.\d+)?([a-z%])?$/i;

function formatSpecifier(specifier) {
  return new FormatSpecifier(specifier);
}

formatSpecifier.prototype = FormatSpecifier.prototype; // instanceof

function FormatSpecifier(specifier) {
  if (!(match = re.exec(specifier))) throw new Error("invalid format: " + specifier);

  var match,
      fill = match[1] || " ",
      align = match[2] || ">",
      sign = match[3] || "-",
      symbol = match[4] || "",
      zero = !!match[5],
      width = match[6] && +match[6],
      comma = !!match[7],
      precision = match[8] && +match[8].slice(1),
      type = match[9] || "";

  // The "n" type is an alias for ",g".
  if (type === "n") comma = true, type = "g";

  // Map invalid types to the default format.
  else if (!formatTypes[type]) type = "";

  // If zero fill is specified, padding goes after sign and before digits.
  if (zero || (fill === "0" && align === "=")) zero = true, fill = "0", align = "=";

  this.fill = fill;
  this.align = align;
  this.sign = sign;
  this.symbol = symbol;
  this.zero = zero;
  this.width = width;
  this.comma = comma;
  this.precision = precision;
  this.type = type;
}

FormatSpecifier.prototype.toString = function() {
  return this.fill
      + this.align
      + this.sign
      + this.symbol
      + (this.zero ? "0" : "")
      + (this.width == null ? "" : Math.max(1, this.width | 0))
      + (this.comma ? "," : "")
      + (this.precision == null ? "" : "." + Math.max(0, this.precision | 0))
      + this.type;
};

var identity$4 = function(x) {
  return x;
};

var prefixes = ["y","z","a","f","p","n","µ","m","","k","M","G","T","P","E","Z","Y"];

var formatLocale = function(locale) {
  var group = locale.grouping && locale.thousands ? formatGroup(locale.grouping, locale.thousands) : identity$4,
      currency = locale.currency,
      decimal = locale.decimal,
      numerals = locale.numerals ? formatNumerals(locale.numerals) : identity$4,
      percent = locale.percent || "%";

  function newFormat(specifier) {
    specifier = formatSpecifier(specifier);

    var fill = specifier.fill,
        align = specifier.align,
        sign = specifier.sign,
        symbol = specifier.symbol,
        zero = specifier.zero,
        width = specifier.width,
        comma = specifier.comma,
        precision = specifier.precision,
        type = specifier.type;

    // Compute the prefix and suffix.
    // For SI-prefix, the suffix is lazily computed.
    var prefix = symbol === "$" ? currency[0] : symbol === "#" && /[boxX]/.test(type) ? "0" + type.toLowerCase() : "",
        suffix = symbol === "$" ? currency[1] : /[%p]/.test(type) ? percent : "";

    // What format function should we use?
    // Is this an integer type?
    // Can this type generate exponential notation?
    var formatType = formatTypes[type],
        maybeSuffix = !type || /[defgprs%]/.test(type);

    // Set the default precision if not specified,
    // or clamp the specified precision to the supported range.
    // For significant precision, it must be in [1, 21].
    // For fixed precision, it must be in [0, 20].
    precision = precision == null ? (type ? 6 : 12)
        : /[gprs]/.test(type) ? Math.max(1, Math.min(21, precision))
        : Math.max(0, Math.min(20, precision));

    function format(value) {
      var valuePrefix = prefix,
          valueSuffix = suffix,
          i, n, c;

      if (type === "c") {
        valueSuffix = formatType(value) + valueSuffix;
        value = "";
      } else {
        value = +value;

        // Perform the initial formatting.
        var valueNegative = value < 0;
        value = formatType(Math.abs(value), precision);

        // If a negative value rounds to zero during formatting, treat as positive.
        if (valueNegative && +value === 0) valueNegative = false;

        // Compute the prefix and suffix.
        valuePrefix = (valueNegative ? (sign === "(" ? sign : "-") : sign === "-" || sign === "(" ? "" : sign) + valuePrefix;
        valueSuffix = valueSuffix + (type === "s" ? prefixes[8 + prefixExponent / 3] : "") + (valueNegative && sign === "(" ? ")" : "");

        // Break the formatted value into the integer “value” part that can be
        // grouped, and fractional or exponential “suffix” part that is not.
        if (maybeSuffix) {
          i = -1, n = value.length;
          while (++i < n) {
            if (c = value.charCodeAt(i), 48 > c || c > 57) {
              valueSuffix = (c === 46 ? decimal + value.slice(i + 1) : value.slice(i)) + valueSuffix;
              value = value.slice(0, i);
              break;
            }
          }
        }
      }

      // If the fill character is not "0", grouping is applied before padding.
      if (comma && !zero) value = group(value, Infinity);

      // Compute the padding.
      var length = valuePrefix.length + value.length + valueSuffix.length,
          padding = length < width ? new Array(width - length + 1).join(fill) : "";

      // If the fill character is "0", grouping is applied after padding.
      if (comma && zero) value = group(padding + value, padding.length ? width - valueSuffix.length : Infinity), padding = "";

      // Reconstruct the final output based on the desired alignment.
      switch (align) {
        case "<": value = valuePrefix + value + valueSuffix + padding; break;
        case "=": value = valuePrefix + padding + value + valueSuffix; break;
        case "^": value = padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length); break;
        default: value = padding + valuePrefix + value + valueSuffix; break;
      }

      return numerals(value);
    }

    format.toString = function() {
      return specifier + "";
    };

    return format;
  }

  function formatPrefix(specifier, value) {
    var f = newFormat((specifier = formatSpecifier(specifier), specifier.type = "f", specifier)),
        e = Math.max(-8, Math.min(8, Math.floor(exponent$1(value) / 3))) * 3,
        k = Math.pow(10, -e),
        prefix = prefixes[8 + e / 3];
    return function(value) {
      return f(k * value) + prefix;
    };
  }

  return {
    format: newFormat,
    formatPrefix: formatPrefix
  };
};

var locale$1;



defaultLocale({
  decimal: ".",
  thousands: ",",
  grouping: [3],
  currency: ["$", ""]
});

function defaultLocale(definition) {
  locale$1 = formatLocale(definition);
  exports.format = locale$1.format;
  exports.formatPrefix = locale$1.formatPrefix;
  return locale$1;
}

var precisionFixed = function(step) {
  return Math.max(0, -exponent$1(Math.abs(step)));
};

var precisionPrefix = function(step, value) {
  return Math.max(0, Math.max(-8, Math.min(8, Math.floor(exponent$1(value) / 3))) * 3 - exponent$1(Math.abs(step)));
};

var precisionRound = function(step, max) {
  step = Math.abs(step), max = Math.abs(max) - step;
  return Math.max(0, exponent$1(max) - exponent$1(step)) + 1;
};

// Adds floating point numbers with twice the normal precision.
// Reference: J. R. Shewchuk, Adaptive Precision Floating-Point Arithmetic and
// Fast Robust Geometric Predicates, Discrete & Computational Geometry 18(3)
// 305–363 (1997).
// Code adapted from GeographicLib by Charles F. F. Karney,
// http://geographiclib.sourceforge.net/

var adder = function() {
  return new Adder;
};

function Adder() {
  this.reset();
}

Adder.prototype = {
  constructor: Adder,
  reset: function() {
    this.s = // rounded value
    this.t = 0; // exact error
  },
  add: function(y) {
    add$1(temp, y, this.t);
    add$1(this, temp.s, this.s);
    if (this.s) this.t += temp.t;
    else this.s = temp.t;
  },
  valueOf: function() {
    return this.s;
  }
};

var temp = new Adder;

function add$1(adder, a, b) {
  var x = adder.s = a + b,
      bv = x - a,
      av = x - bv;
  adder.t = (a - av) + (b - bv);
}

var epsilon$2 = 1e-6;
var epsilon2$1 = 1e-12;
var pi$3 = Math.PI;
var halfPi$2 = pi$3 / 2;
var quarterPi = pi$3 / 4;
var tau$3 = pi$3 * 2;

var degrees$1 = 180 / pi$3;
var radians = pi$3 / 180;

var abs = Math.abs;
var atan = Math.atan;
var atan2 = Math.atan2;
var cos$1 = Math.cos;
var ceil = Math.ceil;
var exp = Math.exp;

var log = Math.log;
var pow = Math.pow;
var sin$1 = Math.sin;
var sign = Math.sign || function(x) { return x > 0 ? 1 : x < 0 ? -1 : 0; };
var sqrt = Math.sqrt;
var tan = Math.tan;

function acos(x) {
  return x > 1 ? 0 : x < -1 ? pi$3 : Math.acos(x);
}

function asin(x) {
  return x > 1 ? halfPi$2 : x < -1 ? -halfPi$2 : Math.asin(x);
}

function haversin(x) {
  return (x = sin$1(x / 2)) * x;
}

function noop$1() {}

function streamGeometry(geometry, stream) {
  if (geometry && streamGeometryType.hasOwnProperty(geometry.type)) {
    streamGeometryType[geometry.type](geometry, stream);
  }
}

var streamObjectType = {
  Feature: function(object, stream) {
    streamGeometry(object.geometry, stream);
  },
  FeatureCollection: function(object, stream) {
    var features = object.features, i = -1, n = features.length;
    while (++i < n) streamGeometry(features[i].geometry, stream);
  }
};

var streamGeometryType = {
  Sphere: function(object, stream) {
    stream.sphere();
  },
  Point: function(object, stream) {
    object = object.coordinates;
    stream.point(object[0], object[1], object[2]);
  },
  MultiPoint: function(object, stream) {
    var coordinates = object.coordinates, i = -1, n = coordinates.length;
    while (++i < n) object = coordinates[i], stream.point(object[0], object[1], object[2]);
  },
  LineString: function(object, stream) {
    streamLine(object.coordinates, stream, 0);
  },
  MultiLineString: function(object, stream) {
    var coordinates = object.coordinates, i = -1, n = coordinates.length;
    while (++i < n) streamLine(coordinates[i], stream, 0);
  },
  Polygon: function(object, stream) {
    streamPolygon(object.coordinates, stream);
  },
  MultiPolygon: function(object, stream) {
    var coordinates = object.coordinates, i = -1, n = coordinates.length;
    while (++i < n) streamPolygon(coordinates[i], stream);
  },
  GeometryCollection: function(object, stream) {
    var geometries = object.geometries, i = -1, n = geometries.length;
    while (++i < n) streamGeometry(geometries[i], stream);
  }
};

function streamLine(coordinates, stream, closed) {
  var i = -1, n = coordinates.length - closed, coordinate;
  stream.lineStart();
  while (++i < n) coordinate = coordinates[i], stream.point(coordinate[0], coordinate[1], coordinate[2]);
  stream.lineEnd();
}

function streamPolygon(coordinates, stream) {
  var i = -1, n = coordinates.length;
  stream.polygonStart();
  while (++i < n) streamLine(coordinates[i], stream, 1);
  stream.polygonEnd();
}

var geoStream = function(object, stream) {
  if (object && streamObjectType.hasOwnProperty(object.type)) {
    streamObjectType[object.type](object, stream);
  } else {
    streamGeometry(object, stream);
  }
};

var areaRingSum = adder();

var areaSum = adder();
var lambda00;
var phi00;
var lambda0;
var cosPhi0;
var sinPhi0;

var areaStream = {
  point: noop$1,
  lineStart: noop$1,
  lineEnd: noop$1,
  polygonStart: function() {
    areaRingSum.reset();
    areaStream.lineStart = areaRingStart;
    areaStream.lineEnd = areaRingEnd;
  },
  polygonEnd: function() {
    var areaRing = +areaRingSum;
    areaSum.add(areaRing < 0 ? tau$3 + areaRing : areaRing);
    this.lineStart = this.lineEnd = this.point = noop$1;
  },
  sphere: function() {
    areaSum.add(tau$3);
  }
};

function areaRingStart() {
  areaStream.point = areaPointFirst;
}

function areaRingEnd() {
  areaPoint(lambda00, phi00);
}

function areaPointFirst(lambda, phi) {
  areaStream.point = areaPoint;
  lambda00 = lambda, phi00 = phi;
  lambda *= radians, phi *= radians;
  lambda0 = lambda, cosPhi0 = cos$1(phi = phi / 2 + quarterPi), sinPhi0 = sin$1(phi);
}

function areaPoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  phi = phi / 2 + quarterPi; // half the angular distance from south pole

  // Spherical excess E for a spherical triangle with vertices: south pole,
  // previous point, current point.  Uses a formula derived from Cagnoli’s
  // theorem.  See Todhunter, Spherical Trig. (1871), Sec. 103, Eq. (2).
  var dLambda = lambda - lambda0,
      sdLambda = dLambda >= 0 ? 1 : -1,
      adLambda = sdLambda * dLambda,
      cosPhi = cos$1(phi),
      sinPhi = sin$1(phi),
      k = sinPhi0 * sinPhi,
      u = cosPhi0 * cosPhi + k * cos$1(adLambda),
      v = k * sdLambda * sin$1(adLambda);
  areaRingSum.add(atan2(v, u));

  // Advance the previous points.
  lambda0 = lambda, cosPhi0 = cosPhi, sinPhi0 = sinPhi;
}

var area = function(object) {
  areaSum.reset();
  geoStream(object, areaStream);
  return areaSum * 2;
};

function spherical(cartesian) {
  return [atan2(cartesian[1], cartesian[0]), asin(cartesian[2])];
}

function cartesian(spherical) {
  var lambda = spherical[0], phi = spherical[1], cosPhi = cos$1(phi);
  return [cosPhi * cos$1(lambda), cosPhi * sin$1(lambda), sin$1(phi)];
}

function cartesianDot(a, b) {
  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
}

function cartesianCross(a, b) {
  return [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]];
}

// TODO return a
function cartesianAddInPlace(a, b) {
  a[0] += b[0], a[1] += b[1], a[2] += b[2];
}

function cartesianScale(vector, k) {
  return [vector[0] * k, vector[1] * k, vector[2] * k];
}

// TODO return d
function cartesianNormalizeInPlace(d) {
  var l = sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
  d[0] /= l, d[1] /= l, d[2] /= l;
}

var lambda0$1;
var phi0;
var lambda1;
var phi1;
var lambda2;
var lambda00$1;
var phi00$1;
var p0;
var deltaSum = adder();
var ranges;
var range$1;

var boundsStream = {
  point: boundsPoint,
  lineStart: boundsLineStart,
  lineEnd: boundsLineEnd,
  polygonStart: function() {
    boundsStream.point = boundsRingPoint;
    boundsStream.lineStart = boundsRingStart;
    boundsStream.lineEnd = boundsRingEnd;
    deltaSum.reset();
    areaStream.polygonStart();
  },
  polygonEnd: function() {
    areaStream.polygonEnd();
    boundsStream.point = boundsPoint;
    boundsStream.lineStart = boundsLineStart;
    boundsStream.lineEnd = boundsLineEnd;
    if (areaRingSum < 0) lambda0$1 = -(lambda1 = 180), phi0 = -(phi1 = 90);
    else if (deltaSum > epsilon$2) phi1 = 90;
    else if (deltaSum < -epsilon$2) phi0 = -90;
    range$1[0] = lambda0$1, range$1[1] = lambda1;
  }
};

function boundsPoint(lambda, phi) {
  ranges.push(range$1 = [lambda0$1 = lambda, lambda1 = lambda]);
  if (phi < phi0) phi0 = phi;
  if (phi > phi1) phi1 = phi;
}

function linePoint(lambda, phi) {
  var p = cartesian([lambda * radians, phi * radians]);
  if (p0) {
    var normal = cartesianCross(p0, p),
        equatorial = [normal[1], -normal[0], 0],
        inflection = cartesianCross(equatorial, normal);
    cartesianNormalizeInPlace(inflection);
    inflection = spherical(inflection);
    var delta = lambda - lambda2,
        sign$$1 = delta > 0 ? 1 : -1,
        lambdai = inflection[0] * degrees$1 * sign$$1,
        phii,
        antimeridian = abs(delta) > 180;
    if (antimeridian ^ (sign$$1 * lambda2 < lambdai && lambdai < sign$$1 * lambda)) {
      phii = inflection[1] * degrees$1;
      if (phii > phi1) phi1 = phii;
    } else if (lambdai = (lambdai + 360) % 360 - 180, antimeridian ^ (sign$$1 * lambda2 < lambdai && lambdai < sign$$1 * lambda)) {
      phii = -inflection[1] * degrees$1;
      if (phii < phi0) phi0 = phii;
    } else {
      if (phi < phi0) phi0 = phi;
      if (phi > phi1) phi1 = phi;
    }
    if (antimeridian) {
      if (lambda < lambda2) {
        if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
      } else {
        if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
      }
    } else {
      if (lambda1 >= lambda0$1) {
        if (lambda < lambda0$1) lambda0$1 = lambda;
        if (lambda > lambda1) lambda1 = lambda;
      } else {
        if (lambda > lambda2) {
          if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
        } else {
          if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
        }
      }
    }
  } else {
    ranges.push(range$1 = [lambda0$1 = lambda, lambda1 = lambda]);
  }
  if (phi < phi0) phi0 = phi;
  if (phi > phi1) phi1 = phi;
  p0 = p, lambda2 = lambda;
}

function boundsLineStart() {
  boundsStream.point = linePoint;
}

function boundsLineEnd() {
  range$1[0] = lambda0$1, range$1[1] = lambda1;
  boundsStream.point = boundsPoint;
  p0 = null;
}

function boundsRingPoint(lambda, phi) {
  if (p0) {
    var delta = lambda - lambda2;
    deltaSum.add(abs(delta) > 180 ? delta + (delta > 0 ? 360 : -360) : delta);
  } else {
    lambda00$1 = lambda, phi00$1 = phi;
  }
  areaStream.point(lambda, phi);
  linePoint(lambda, phi);
}

function boundsRingStart() {
  areaStream.lineStart();
}

function boundsRingEnd() {
  boundsRingPoint(lambda00$1, phi00$1);
  areaStream.lineEnd();
  if (abs(deltaSum) > epsilon$2) lambda0$1 = -(lambda1 = 180);
  range$1[0] = lambda0$1, range$1[1] = lambda1;
  p0 = null;
}

// Finds the left-right distance between two longitudes.
// This is almost the same as (lambda1 - lambda0 + 360°) % 360°, except that we want
// the distance between ±180° to be 360°.
function angle(lambda0, lambda1) {
  return (lambda1 -= lambda0) < 0 ? lambda1 + 360 : lambda1;
}

function rangeCompare(a, b) {
  return a[0] - b[0];
}

function rangeContains(range, x) {
  return range[0] <= range[1] ? range[0] <= x && x <= range[1] : x < range[0] || range[1] < x;
}

var bounds = function(feature) {
  var i, n, a, b, merged, deltaMax, delta;

  phi1 = lambda1 = -(lambda0$1 = phi0 = Infinity);
  ranges = [];
  geoStream(feature, boundsStream);

  // First, sort ranges by their minimum longitudes.
  if (n = ranges.length) {
    ranges.sort(rangeCompare);

    // Then, merge any ranges that overlap.
    for (i = 1, a = ranges[0], merged = [a]; i < n; ++i) {
      b = ranges[i];
      if (rangeContains(a, b[0]) || rangeContains(a, b[1])) {
        if (angle(a[0], b[1]) > angle(a[0], a[1])) a[1] = b[1];
        if (angle(b[0], a[1]) > angle(a[0], a[1])) a[0] = b[0];
      } else {
        merged.push(a = b);
      }
    }

    // Finally, find the largest gap between the merged ranges.
    // The final bounding box will be the inverse of this gap.
    for (deltaMax = -Infinity, n = merged.length - 1, i = 0, a = merged[n]; i <= n; a = b, ++i) {
      b = merged[i];
      if ((delta = angle(a[1], b[0])) > deltaMax) deltaMax = delta, lambda0$1 = b[0], lambda1 = a[1];
    }
  }

  ranges = range$1 = null;

  return lambda0$1 === Infinity || phi0 === Infinity
      ? [[NaN, NaN], [NaN, NaN]]
      : [[lambda0$1, phi0], [lambda1, phi1]];
};

var W0;
var W1;
var X0;
var Y0;
var Z0;
var X1;
var Y1;
var Z1;
var X2;
var Y2;
var Z2;
var lambda00$2;
var phi00$2;
var x0;
var y0;
var z0; // previous point

var centroidStream = {
  sphere: noop$1,
  point: centroidPoint,
  lineStart: centroidLineStart,
  lineEnd: centroidLineEnd,
  polygonStart: function() {
    centroidStream.lineStart = centroidRingStart;
    centroidStream.lineEnd = centroidRingEnd;
  },
  polygonEnd: function() {
    centroidStream.lineStart = centroidLineStart;
    centroidStream.lineEnd = centroidLineEnd;
  }
};

// Arithmetic mean of Cartesian vectors.
function centroidPoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  var cosPhi = cos$1(phi);
  centroidPointCartesian(cosPhi * cos$1(lambda), cosPhi * sin$1(lambda), sin$1(phi));
}

function centroidPointCartesian(x, y, z) {
  ++W0;
  X0 += (x - X0) / W0;
  Y0 += (y - Y0) / W0;
  Z0 += (z - Z0) / W0;
}

function centroidLineStart() {
  centroidStream.point = centroidLinePointFirst;
}

function centroidLinePointFirst(lambda, phi) {
  lambda *= radians, phi *= radians;
  var cosPhi = cos$1(phi);
  x0 = cosPhi * cos$1(lambda);
  y0 = cosPhi * sin$1(lambda);
  z0 = sin$1(phi);
  centroidStream.point = centroidLinePoint;
  centroidPointCartesian(x0, y0, z0);
}

function centroidLinePoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  var cosPhi = cos$1(phi),
      x = cosPhi * cos$1(lambda),
      y = cosPhi * sin$1(lambda),
      z = sin$1(phi),
      w = atan2(sqrt((w = y0 * z - z0 * y) * w + (w = z0 * x - x0 * z) * w + (w = x0 * y - y0 * x) * w), x0 * x + y0 * y + z0 * z);
  W1 += w;
  X1 += w * (x0 + (x0 = x));
  Y1 += w * (y0 + (y0 = y));
  Z1 += w * (z0 + (z0 = z));
  centroidPointCartesian(x0, y0, z0);
}

function centroidLineEnd() {
  centroidStream.point = centroidPoint;
}

// See J. E. Brock, The Inertia Tensor for a Spherical Triangle,
// J. Applied Mechanics 42, 239 (1975).
function centroidRingStart() {
  centroidStream.point = centroidRingPointFirst;
}

function centroidRingEnd() {
  centroidRingPoint(lambda00$2, phi00$2);
  centroidStream.point = centroidPoint;
}

function centroidRingPointFirst(lambda, phi) {
  lambda00$2 = lambda, phi00$2 = phi;
  lambda *= radians, phi *= radians;
  centroidStream.point = centroidRingPoint;
  var cosPhi = cos$1(phi);
  x0 = cosPhi * cos$1(lambda);
  y0 = cosPhi * sin$1(lambda);
  z0 = sin$1(phi);
  centroidPointCartesian(x0, y0, z0);
}

function centroidRingPoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  var cosPhi = cos$1(phi),
      x = cosPhi * cos$1(lambda),
      y = cosPhi * sin$1(lambda),
      z = sin$1(phi),
      cx = y0 * z - z0 * y,
      cy = z0 * x - x0 * z,
      cz = x0 * y - y0 * x,
      m = sqrt(cx * cx + cy * cy + cz * cz),
      w = asin(m), // line weight = angle
      v = m && -w / m; // area weight multiplier
  X2 += v * cx;
  Y2 += v * cy;
  Z2 += v * cz;
  W1 += w;
  X1 += w * (x0 + (x0 = x));
  Y1 += w * (y0 + (y0 = y));
  Z1 += w * (z0 + (z0 = z));
  centroidPointCartesian(x0, y0, z0);
}

var centroid = function(object) {
  W0 = W1 =
  X0 = Y0 = Z0 =
  X1 = Y1 = Z1 =
  X2 = Y2 = Z2 = 0;
  geoStream(object, centroidStream);

  var x = X2,
      y = Y2,
      z = Z2,
      m = x * x + y * y + z * z;

  // If the area-weighted ccentroid is undefined, fall back to length-weighted ccentroid.
  if (m < epsilon2$1) {
    x = X1, y = Y1, z = Z1;
    // If the feature has zero length, fall back to arithmetic mean of point vectors.
    if (W1 < epsilon$2) x = X0, y = Y0, z = Z0;
    m = x * x + y * y + z * z;
    // If the feature still has an undefined ccentroid, then return.
    if (m < epsilon2$1) return [NaN, NaN];
  }

  return [atan2(y, x) * degrees$1, asin(z / sqrt(m)) * degrees$1];
};

var constant$8 = function(x) {
  return function() {
    return x;
  };
};

var compose = function(a, b) {

  function compose(x, y) {
    return x = a(x, y), b(x[0], x[1]);
  }

  if (a.invert && b.invert) compose.invert = function(x, y) {
    return x = b.invert(x, y), x && a.invert(x[0], x[1]);
  };

  return compose;
};

function rotationIdentity(lambda, phi) {
  return [lambda > pi$3 ? lambda - tau$3 : lambda < -pi$3 ? lambda + tau$3 : lambda, phi];
}

rotationIdentity.invert = rotationIdentity;

function rotateRadians(deltaLambda, deltaPhi, deltaGamma) {
  return (deltaLambda %= tau$3) ? (deltaPhi || deltaGamma ? compose(rotationLambda(deltaLambda), rotationPhiGamma(deltaPhi, deltaGamma))
    : rotationLambda(deltaLambda))
    : (deltaPhi || deltaGamma ? rotationPhiGamma(deltaPhi, deltaGamma)
    : rotationIdentity);
}

function forwardRotationLambda(deltaLambda) {
  return function(lambda, phi) {
    return lambda += deltaLambda, [lambda > pi$3 ? lambda - tau$3 : lambda < -pi$3 ? lambda + tau$3 : lambda, phi];
  };
}

function rotationLambda(deltaLambda) {
  var rotation = forwardRotationLambda(deltaLambda);
  rotation.invert = forwardRotationLambda(-deltaLambda);
  return rotation;
}

function rotationPhiGamma(deltaPhi, deltaGamma) {
  var cosDeltaPhi = cos$1(deltaPhi),
      sinDeltaPhi = sin$1(deltaPhi),
      cosDeltaGamma = cos$1(deltaGamma),
      sinDeltaGamma = sin$1(deltaGamma);

  function rotation(lambda, phi) {
    var cosPhi = cos$1(phi),
        x = cos$1(lambda) * cosPhi,
        y = sin$1(lambda) * cosPhi,
        z = sin$1(phi),
        k = z * cosDeltaPhi + x * sinDeltaPhi;
    return [
      atan2(y * cosDeltaGamma - k * sinDeltaGamma, x * cosDeltaPhi - z * sinDeltaPhi),
      asin(k * cosDeltaGamma + y * sinDeltaGamma)
    ];
  }

  rotation.invert = function(lambda, phi) {
    var cosPhi = cos$1(phi),
        x = cos$1(lambda) * cosPhi,
        y = sin$1(lambda) * cosPhi,
        z = sin$1(phi),
        k = z * cosDeltaGamma - y * sinDeltaGamma;
    return [
      atan2(y * cosDeltaGamma + z * sinDeltaGamma, x * cosDeltaPhi + k * sinDeltaPhi),
      asin(k * cosDeltaPhi - x * sinDeltaPhi)
    ];
  };

  return rotation;
}

var rotation = function(rotate) {
  rotate = rotateRadians(rotate[0] * radians, rotate[1] * radians, rotate.length > 2 ? rotate[2] * radians : 0);

  function forward(coordinates) {
    coordinates = rotate(coordinates[0] * radians, coordinates[1] * radians);
    return coordinates[0] *= degrees$1, coordinates[1] *= degrees$1, coordinates;
  }

  forward.invert = function(coordinates) {
    coordinates = rotate.invert(coordinates[0] * radians, coordinates[1] * radians);
    return coordinates[0] *= degrees$1, coordinates[1] *= degrees$1, coordinates;
  };

  return forward;
};

// Generates a circle centered at [0°, 0°], with a given radius and precision.
function circleStream(stream, radius, delta, direction, t0, t1) {
  if (!delta) return;
  var cosRadius = cos$1(radius),
      sinRadius = sin$1(radius),
      step = direction * delta;
  if (t0 == null) {
    t0 = radius + direction * tau$3;
    t1 = radius - step / 2;
  } else {
    t0 = circleRadius(cosRadius, t0);
    t1 = circleRadius(cosRadius, t1);
    if (direction > 0 ? t0 < t1 : t0 > t1) t0 += direction * tau$3;
  }
  for (var point, t = t0; direction > 0 ? t > t1 : t < t1; t -= step) {
    point = spherical([cosRadius, -sinRadius * cos$1(t), -sinRadius * sin$1(t)]);
    stream.point(point[0], point[1]);
  }
}

// Returns the signed angle of a cartesian point relative to [cosRadius, 0, 0].
function circleRadius(cosRadius, point) {
  point = cartesian(point), point[0] -= cosRadius;
  cartesianNormalizeInPlace(point);
  var radius = acos(-point[1]);
  return ((-point[2] < 0 ? -radius : radius) + tau$3 - epsilon$2) % tau$3;
}

var circle = function() {
  var center = constant$8([0, 0]),
      radius = constant$8(90),
      precision = constant$8(6),
      ring,
      rotate,
      stream = {point: point};

  function point(x, y) {
    ring.push(x = rotate(x, y));
    x[0] *= degrees$1, x[1] *= degrees$1;
  }

  function circle() {
    var c = center.apply(this, arguments),
        r = radius.apply(this, arguments) * radians,
        p = precision.apply(this, arguments) * radians;
    ring = [];
    rotate = rotateRadians(-c[0] * radians, -c[1] * radians, 0).invert;
    circleStream(stream, r, p, 1);
    c = {type: "Polygon", coordinates: [ring]};
    ring = rotate = null;
    return c;
  }

  circle.center = function(_) {
    return arguments.length ? (center = typeof _ === "function" ? _ : constant$8([+_[0], +_[1]]), circle) : center;
  };

  circle.radius = function(_) {
    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$8(+_), circle) : radius;
  };

  circle.precision = function(_) {
    return arguments.length ? (precision = typeof _ === "function" ? _ : constant$8(+_), circle) : precision;
  };

  return circle;
};

var clipBuffer = function() {
  var lines = [],
      line;
  return {
    point: function(x, y) {
      line.push([x, y]);
    },
    lineStart: function() {
      lines.push(line = []);
    },
    lineEnd: noop$1,
    rejoin: function() {
      if (lines.length > 1) lines.push(lines.pop().concat(lines.shift()));
    },
    result: function() {
      var result = lines;
      lines = [];
      line = null;
      return result;
    }
  };
};

var clipLine = function(a, b, x0, y0, x1, y1) {
  var ax = a[0],
      ay = a[1],
      bx = b[0],
      by = b[1],
      t0 = 0,
      t1 = 1,
      dx = bx - ax,
      dy = by - ay,
      r;

  r = x0 - ax;
  if (!dx && r > 0) return;
  r /= dx;
  if (dx < 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  } else if (dx > 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  }

  r = x1 - ax;
  if (!dx && r < 0) return;
  r /= dx;
  if (dx < 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  } else if (dx > 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  }

  r = y0 - ay;
  if (!dy && r > 0) return;
  r /= dy;
  if (dy < 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  } else if (dy > 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  }

  r = y1 - ay;
  if (!dy && r < 0) return;
  r /= dy;
  if (dy < 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  } else if (dy > 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  }

  if (t0 > 0) a[0] = ax + t0 * dx, a[1] = ay + t0 * dy;
  if (t1 < 1) b[0] = ax + t1 * dx, b[1] = ay + t1 * dy;
  return true;
};

var pointEqual = function(a, b) {
  return abs(a[0] - b[0]) < epsilon$2 && abs(a[1] - b[1]) < epsilon$2;
};

function Intersection(point, points, other, entry) {
  this.x = point;
  this.z = points;
  this.o = other; // another intersection
  this.e = entry; // is an entry?
  this.v = false; // visited
  this.n = this.p = null; // next & previous
}

// A generalized polygon clipping algorithm: given a polygon that has been cut
// into its visible line segments, and rejoins the segments by interpolating
// along the clip edge.
var clipPolygon = function(segments, compareIntersection, startInside, interpolate, stream) {
  var subject = [],
      clip = [],
      i,
      n;

  segments.forEach(function(segment) {
    if ((n = segment.length - 1) <= 0) return;
    var n, p0 = segment[0], p1 = segment[n], x;

    // If the first and last points of a segment are coincident, then treat as a
    // closed ring. TODO if all rings are closed, then the winding order of the
    // exterior ring should be checked.
    if (pointEqual(p0, p1)) {
      stream.lineStart();
      for (i = 0; i < n; ++i) stream.point((p0 = segment[i])[0], p0[1]);
      stream.lineEnd();
      return;
    }

    subject.push(x = new Intersection(p0, segment, null, true));
    clip.push(x.o = new Intersection(p0, null, x, false));
    subject.push(x = new Intersection(p1, segment, null, false));
    clip.push(x.o = new Intersection(p1, null, x, true));
  });

  if (!subject.length) return;

  clip.sort(compareIntersection);
  link$1(subject);
  link$1(clip);

  for (i = 0, n = clip.length; i < n; ++i) {
    clip[i].e = startInside = !startInside;
  }

  var start = subject[0],
      points,
      point;

  while (1) {
    // Find first unvisited intersection.
    var current = start,
        isSubject = true;
    while (current.v) if ((current = current.n) === start) return;
    points = current.z;
    stream.lineStart();
    do {
      current.v = current.o.v = true;
      if (current.e) {
        if (isSubject) {
          for (i = 0, n = points.length; i < n; ++i) stream.point((point = points[i])[0], point[1]);
        } else {
          interpolate(current.x, current.n.x, 1, stream);
        }
        current = current.n;
      } else {
        if (isSubject) {
          points = current.p.z;
          for (i = points.length - 1; i >= 0; --i) stream.point((point = points[i])[0], point[1]);
        } else {
          interpolate(current.x, current.p.x, -1, stream);
        }
        current = current.p;
      }
      current = current.o;
      points = current.z;
      isSubject = !isSubject;
    } while (!current.v);
    stream.lineEnd();
  }
};

function link$1(array) {
  if (!(n = array.length)) return;
  var n,
      i = 0,
      a = array[0],
      b;
  while (++i < n) {
    a.n = b = array[i];
    b.p = a;
    a = b;
  }
  a.n = b = array[0];
  b.p = a;
}

var clipMax = 1e9;
var clipMin = -clipMax;

// TODO Use d3-polygon’s polygonContains here for the ring check?
// TODO Eliminate duplicate buffering in clipBuffer and polygon.push?

function clipExtent(x0, y0, x1, y1) {

  function visible(x, y) {
    return x0 <= x && x <= x1 && y0 <= y && y <= y1;
  }

  function interpolate(from, to, direction, stream) {
    var a = 0, a1 = 0;
    if (from == null
        || (a = corner(from, direction)) !== (a1 = corner(to, direction))
        || comparePoint(from, to) < 0 ^ direction > 0) {
      do stream.point(a === 0 || a === 3 ? x0 : x1, a > 1 ? y1 : y0);
      while ((a = (a + direction + 4) % 4) !== a1);
    } else {
      stream.point(to[0], to[1]);
    }
  }

  function corner(p, direction) {
    return abs(p[0] - x0) < epsilon$2 ? direction > 0 ? 0 : 3
        : abs(p[0] - x1) < epsilon$2 ? direction > 0 ? 2 : 1
        : abs(p[1] - y0) < epsilon$2 ? direction > 0 ? 1 : 0
        : direction > 0 ? 3 : 2; // abs(p[1] - y1) < epsilon
  }

  function compareIntersection(a, b) {
    return comparePoint(a.x, b.x);
  }

  function comparePoint(a, b) {
    var ca = corner(a, 1),
        cb = corner(b, 1);
    return ca !== cb ? ca - cb
        : ca === 0 ? b[1] - a[1]
        : ca === 1 ? a[0] - b[0]
        : ca === 2 ? a[1] - b[1]
        : b[0] - a[0];
  }

  return function(stream) {
    var activeStream = stream,
        bufferStream = clipBuffer(),
        segments,
        polygon,
        ring,
        x__, y__, v__, // first point
        x_, y_, v_, // previous point
        first,
        clean;

    var clipStream = {
      point: point,
      lineStart: lineStart,
      lineEnd: lineEnd,
      polygonStart: polygonStart,
      polygonEnd: polygonEnd
    };

    function point(x, y) {
      if (visible(x, y)) activeStream.point(x, y);
    }

    function polygonInside() {
      var winding = 0;

      for (var i = 0, n = polygon.length; i < n; ++i) {
        for (var ring = polygon[i], j = 1, m = ring.length, point = ring[0], a0, a1, b0 = point[0], b1 = point[1]; j < m; ++j) {
          a0 = b0, a1 = b1, point = ring[j], b0 = point[0], b1 = point[1];
          if (a1 <= y1) { if (b1 > y1 && (b0 - a0) * (y1 - a1) > (b1 - a1) * (x0 - a0)) ++winding; }
          else { if (b1 <= y1 && (b0 - a0) * (y1 - a1) < (b1 - a1) * (x0 - a0)) --winding; }
        }
      }

      return winding;
    }

    // Buffer geometry within a polygon and then clip it en masse.
    function polygonStart() {
      activeStream = bufferStream, segments = [], polygon = [], clean = true;
    }

    function polygonEnd() {
      var startInside = polygonInside(),
          cleanInside = clean && startInside,
          visible = (segments = merge$1(segments)).length;
      if (cleanInside || visible) {
        stream.polygonStart();
        if (cleanInside) {
          stream.lineStart();
          interpolate(null, null, 1, stream);
          stream.lineEnd();
        }
        if (visible) {
          clipPolygon(segments, compareIntersection, startInside, interpolate, stream);
        }
        stream.polygonEnd();
      }
      activeStream = stream, segments = polygon = ring = null;
    }

    function lineStart() {
      clipStream.point = linePoint;
      if (polygon) polygon.push(ring = []);
      first = true;
      v_ = false;
      x_ = y_ = NaN;
    }

    // TODO rather than special-case polygons, simply handle them separately.
    // Ideally, coincident intersection points should be jittered to avoid
    // clipping issues.
    function lineEnd() {
      if (segments) {
        linePoint(x__, y__);
        if (v__ && v_) bufferStream.rejoin();
        segments.push(bufferStream.result());
      }
      clipStream.point = point;
      if (v_) activeStream.lineEnd();
    }

    function linePoint(x, y) {
      var v = visible(x, y);
      if (polygon) ring.push([x, y]);
      if (first) {
        x__ = x, y__ = y, v__ = v;
        first = false;
        if (v) {
          activeStream.lineStart();
          activeStream.point(x, y);
        }
      } else {
        if (v && v_) activeStream.point(x, y);
        else {
          var a = [x_ = Math.max(clipMin, Math.min(clipMax, x_)), y_ = Math.max(clipMin, Math.min(clipMax, y_))],
              b = [x = Math.max(clipMin, Math.min(clipMax, x)), y = Math.max(clipMin, Math.min(clipMax, y))];
          if (clipLine(a, b, x0, y0, x1, y1)) {
            if (!v_) {
              activeStream.lineStart();
              activeStream.point(a[0], a[1]);
            }
            activeStream.point(b[0], b[1]);
            if (!v) activeStream.lineEnd();
            clean = false;
          } else if (v) {
            activeStream.lineStart();
            activeStream.point(x, y);
            clean = false;
          }
        }
      }
      x_ = x, y_ = y, v_ = v;
    }

    return clipStream;
  };
}

var extent$2 = function() {
  var x0 = 0,
      y0 = 0,
      x1 = 960,
      y1 = 500,
      cache,
      cacheStream,
      clip;

  return clip = {
    stream: function(stream) {
      return cache && cacheStream === stream ? cache : cache = clipExtent(x0, y0, x1, y1)(cacheStream = stream);
    },
    extent: function(_) {
      return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], cache = cacheStream = null, clip) : [[x0, y0], [x1, y1]];
    }
  };
};

var sum$2 = adder();

var polygonContains = function(polygon, point) {
  var lambda = point[0],
      phi = point[1],
      normal = [sin$1(lambda), -cos$1(lambda), 0],
      angle = 0,
      winding = 0;

  sum$2.reset();

  for (var i = 0, n = polygon.length; i < n; ++i) {
    if (!(m = (ring = polygon[i]).length)) continue;
    var ring,
        m,
        point0 = ring[m - 1],
        lambda0 = point0[0],
        phi0 = point0[1] / 2 + quarterPi,
        sinPhi0 = sin$1(phi0),
        cosPhi0 = cos$1(phi0);

    for (var j = 0; j < m; ++j, lambda0 = lambda1, sinPhi0 = sinPhi1, cosPhi0 = cosPhi1, point0 = point1) {
      var point1 = ring[j],
          lambda1 = point1[0],
          phi1 = point1[1] / 2 + quarterPi,
          sinPhi1 = sin$1(phi1),
          cosPhi1 = cos$1(phi1),
          delta = lambda1 - lambda0,
          sign$$1 = delta >= 0 ? 1 : -1,
          absDelta = sign$$1 * delta,
          antimeridian = absDelta > pi$3,
          k = sinPhi0 * sinPhi1;

      sum$2.add(atan2(k * sign$$1 * sin$1(absDelta), cosPhi0 * cosPhi1 + k * cos$1(absDelta)));
      angle += antimeridian ? delta + sign$$1 * tau$3 : delta;

      // Are the longitudes either side of the point’s meridian (lambda),
      // and are the latitudes smaller than the parallel (phi)?
      if (antimeridian ^ lambda0 >= lambda ^ lambda1 >= lambda) {
        var arc = cartesianCross(cartesian(point0), cartesian(point1));
        cartesianNormalizeInPlace(arc);
        var intersection = cartesianCross(normal, arc);
        cartesianNormalizeInPlace(intersection);
        var phiArc = (antimeridian ^ delta >= 0 ? -1 : 1) * asin(intersection[2]);
        if (phi > phiArc || phi === phiArc && (arc[0] || arc[1])) {
          winding += antimeridian ^ delta >= 0 ? 1 : -1;
        }
      }
    }
  }

  // First, determine whether the South pole is inside or outside:
  //
  // It is inside if:
  // * the polygon winds around it in a clockwise direction.
  // * the polygon does not (cumulatively) wind around it, but has a negative
  //   (counter-clockwise) area.
  //
  // Second, count the (signed) number of times a segment crosses a lambda
  // from the point to the South pole.  If it is zero, then the point is the
  // same side as the South pole.

  return (angle < -epsilon$2 || angle < epsilon$2 && sum$2 < -epsilon$2) ^ (winding & 1);
};

var lengthSum = adder();
var lambda0$2;
var sinPhi0$1;
var cosPhi0$1;

var lengthStream = {
  sphere: noop$1,
  point: noop$1,
  lineStart: lengthLineStart,
  lineEnd: noop$1,
  polygonStart: noop$1,
  polygonEnd: noop$1
};

function lengthLineStart() {
  lengthStream.point = lengthPointFirst;
  lengthStream.lineEnd = lengthLineEnd;
}

function lengthLineEnd() {
  lengthStream.point = lengthStream.lineEnd = noop$1;
}

function lengthPointFirst(lambda, phi) {
  lambda *= radians, phi *= radians;
  lambda0$2 = lambda, sinPhi0$1 = sin$1(phi), cosPhi0$1 = cos$1(phi);
  lengthStream.point = lengthPoint;
}

function lengthPoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  var sinPhi = sin$1(phi),
      cosPhi = cos$1(phi),
      delta = abs(lambda - lambda0$2),
      cosDelta = cos$1(delta),
      sinDelta = sin$1(delta),
      x = cosPhi * sinDelta,
      y = cosPhi0$1 * sinPhi - sinPhi0$1 * cosPhi * cosDelta,
      z = sinPhi0$1 * sinPhi + cosPhi0$1 * cosPhi * cosDelta;
  lengthSum.add(atan2(sqrt(x * x + y * y), z));
  lambda0$2 = lambda, sinPhi0$1 = sinPhi, cosPhi0$1 = cosPhi;
}

var length$2 = function(object) {
  lengthSum.reset();
  geoStream(object, lengthStream);
  return +lengthSum;
};

var coordinates = [null, null];
var object$1 = {type: "LineString", coordinates: coordinates};

var distance = function(a, b) {
  coordinates[0] = a;
  coordinates[1] = b;
  return length$2(object$1);
};

var containsObjectType = {
  Feature: function(object, point) {
    return containsGeometry(object.geometry, point);
  },
  FeatureCollection: function(object, point) {
    var features = object.features, i = -1, n = features.length;
    while (++i < n) if (containsGeometry(features[i].geometry, point)) return true;
    return false;
  }
};

var containsGeometryType = {
  Sphere: function() {
    return true;
  },
  Point: function(object, point) {
    return containsPoint(object.coordinates, point);
  },
  MultiPoint: function(object, point) {
    var coordinates = object.coordinates, i = -1, n = coordinates.length;
    while (++i < n) if (containsPoint(coordinates[i], point)) return true;
    return false;
  },
  LineString: function(object, point) {
    return containsLine(object.coordinates, point);
  },
  MultiLineString: function(object, point) {
    var coordinates = object.coordinates, i = -1, n = coordinates.length;
    while (++i < n) if (containsLine(coordinates[i], point)) return true;
    return false;
  },
  Polygon: function(object, point) {
    return containsPolygon(object.coordinates, point);
  },
  MultiPolygon: function(object, point) {
    var coordinates = object.coordinates, i = -1, n = coordinates.length;
    while (++i < n) if (containsPolygon(coordinates[i], point)) return true;
    return false;
  },
  GeometryCollection: function(object, point) {
    var geometries = object.geometries, i = -1, n = geometries.length;
    while (++i < n) if (containsGeometry(geometries[i], point)) return true;
    return false;
  }
};

function containsGeometry(geometry, point) {
  return geometry && containsGeometryType.hasOwnProperty(geometry.type)
      ? containsGeometryType[geometry.type](geometry, point)
      : false;
}

function containsPoint(coordinates, point) {
  return distance(coordinates, point) === 0;
}

function containsLine(coordinates, point) {
  var ab = distance(coordinates[0], coordinates[1]),
      ao = distance(coordinates[0], point),
      ob = distance(point, coordinates[1]);
  return ao + ob <= ab + epsilon$2;
}

function containsPolygon(coordinates, point) {
  return !!polygonContains(coordinates.map(ringRadians), pointRadians(point));
}

function ringRadians(ring) {
  return ring = ring.map(pointRadians), ring.pop(), ring;
}

function pointRadians(point) {
  return [point[0] * radians, point[1] * radians];
}

var contains = function(object, point) {
  return (object && containsObjectType.hasOwnProperty(object.type)
      ? containsObjectType[object.type]
      : containsGeometry)(object, point);
};

function graticuleX(y0, y1, dy) {
  var y = sequence(y0, y1 - epsilon$2, dy).concat(y1);
  return function(x) { return y.map(function(y) { return [x, y]; }); };
}

function graticuleY(x0, x1, dx) {
  var x = sequence(x0, x1 - epsilon$2, dx).concat(x1);
  return function(y) { return x.map(function(x) { return [x, y]; }); };
}

function graticule() {
  var x1, x0, X1, X0,
      y1, y0, Y1, Y0,
      dx = 10, dy = dx, DX = 90, DY = 360,
      x, y, X, Y,
      precision = 2.5;

  function graticule() {
    return {type: "MultiLineString", coordinates: lines()};
  }

  function lines() {
    return sequence(ceil(X0 / DX) * DX, X1, DX).map(X)
        .concat(sequence(ceil(Y0 / DY) * DY, Y1, DY).map(Y))
        .concat(sequence(ceil(x0 / dx) * dx, x1, dx).filter(function(x) { return abs(x % DX) > epsilon$2; }).map(x))
        .concat(sequence(ceil(y0 / dy) * dy, y1, dy).filter(function(y) { return abs(y % DY) > epsilon$2; }).map(y));
  }

  graticule.lines = function() {
    return lines().map(function(coordinates) { return {type: "LineString", coordinates: coordinates}; });
  };

  graticule.outline = function() {
    return {
      type: "Polygon",
      coordinates: [
        X(X0).concat(
        Y(Y1).slice(1),
        X(X1).reverse().slice(1),
        Y(Y0).reverse().slice(1))
      ]
    };
  };

  graticule.extent = function(_) {
    if (!arguments.length) return graticule.extentMinor();
    return graticule.extentMajor(_).extentMinor(_);
  };

  graticule.extentMajor = function(_) {
    if (!arguments.length) return [[X0, Y0], [X1, Y1]];
    X0 = +_[0][0], X1 = +_[1][0];
    Y0 = +_[0][1], Y1 = +_[1][1];
    if (X0 > X1) _ = X0, X0 = X1, X1 = _;
    if (Y0 > Y1) _ = Y0, Y0 = Y1, Y1 = _;
    return graticule.precision(precision);
  };

  graticule.extentMinor = function(_) {
    if (!arguments.length) return [[x0, y0], [x1, y1]];
    x0 = +_[0][0], x1 = +_[1][0];
    y0 = +_[0][1], y1 = +_[1][1];
    if (x0 > x1) _ = x0, x0 = x1, x1 = _;
    if (y0 > y1) _ = y0, y0 = y1, y1 = _;
    return graticule.precision(precision);
  };

  graticule.step = function(_) {
    if (!arguments.length) return graticule.stepMinor();
    return graticule.stepMajor(_).stepMinor(_);
  };

  graticule.stepMajor = function(_) {
    if (!arguments.length) return [DX, DY];
    DX = +_[0], DY = +_[1];
    return graticule;
  };

  graticule.stepMinor = function(_) {
    if (!arguments.length) return [dx, dy];
    dx = +_[0], dy = +_[1];
    return graticule;
  };

  graticule.precision = function(_) {
    if (!arguments.length) return precision;
    precision = +_;
    x = graticuleX(y0, y1, 90);
    y = graticuleY(x0, x1, precision);
    X = graticuleX(Y0, Y1, 90);
    Y = graticuleY(X0, X1, precision);
    return graticule;
  };

  return graticule
      .extentMajor([[-180, -90 + epsilon$2], [180, 90 - epsilon$2]])
      .extentMinor([[-180, -80 - epsilon$2], [180, 80 + epsilon$2]]);
}

function graticule10() {
  return graticule()();
}

var interpolate$1 = function(a, b) {
  var x0 = a[0] * radians,
      y0 = a[1] * radians,
      x1 = b[0] * radians,
      y1 = b[1] * radians,
      cy0 = cos$1(y0),
      sy0 = sin$1(y0),
      cy1 = cos$1(y1),
      sy1 = sin$1(y1),
      kx0 = cy0 * cos$1(x0),
      ky0 = cy0 * sin$1(x0),
      kx1 = cy1 * cos$1(x1),
      ky1 = cy1 * sin$1(x1),
      d = 2 * asin(sqrt(haversin(y1 - y0) + cy0 * cy1 * haversin(x1 - x0))),
      k = sin$1(d);

  var interpolate = d ? function(t) {
    var B = sin$1(t *= d) / k,
        A = sin$1(d - t) / k,
        x = A * kx0 + B * kx1,
        y = A * ky0 + B * ky1,
        z = A * sy0 + B * sy1;
    return [
      atan2(y, x) * degrees$1,
      atan2(z, sqrt(x * x + y * y)) * degrees$1
    ];
  } : function() {
    return [x0 * degrees$1, y0 * degrees$1];
  };

  interpolate.distance = d;

  return interpolate;
};

var identity$5 = function(x) {
  return x;
};

var areaSum$1 = adder();
var areaRingSum$1 = adder();
var x00;
var y00;
var x0$1;
var y0$1;

var areaStream$1 = {
  point: noop$1,
  lineStart: noop$1,
  lineEnd: noop$1,
  polygonStart: function() {
    areaStream$1.lineStart = areaRingStart$1;
    areaStream$1.lineEnd = areaRingEnd$1;
  },
  polygonEnd: function() {
    areaStream$1.lineStart = areaStream$1.lineEnd = areaStream$1.point = noop$1;
    areaSum$1.add(abs(areaRingSum$1));
    areaRingSum$1.reset();
  },
  result: function() {
    var area = areaSum$1 / 2;
    areaSum$1.reset();
    return area;
  }
};

function areaRingStart$1() {
  areaStream$1.point = areaPointFirst$1;
}

function areaPointFirst$1(x, y) {
  areaStream$1.point = areaPoint$1;
  x00 = x0$1 = x, y00 = y0$1 = y;
}

function areaPoint$1(x, y) {
  areaRingSum$1.add(y0$1 * x - x0$1 * y);
  x0$1 = x, y0$1 = y;
}

function areaRingEnd$1() {
  areaPoint$1(x00, y00);
}

var x0$2 = Infinity;
var y0$2 = x0$2;
var x1 = -x0$2;
var y1 = x1;

var boundsStream$1 = {
  point: boundsPoint$1,
  lineStart: noop$1,
  lineEnd: noop$1,
  polygonStart: noop$1,
  polygonEnd: noop$1,
  result: function() {
    var bounds = [[x0$2, y0$2], [x1, y1]];
    x1 = y1 = -(y0$2 = x0$2 = Infinity);
    return bounds;
  }
};

function boundsPoint$1(x, y) {
  if (x < x0$2) x0$2 = x;
  if (x > x1) x1 = x;
  if (y < y0$2) y0$2 = y;
  if (y > y1) y1 = y;
}

// TODO Enforce positive area for exterior, negative area for interior?

var X0$1 = 0;
var Y0$1 = 0;
var Z0$1 = 0;
var X1$1 = 0;
var Y1$1 = 0;
var Z1$1 = 0;
var X2$1 = 0;
var Y2$1 = 0;
var Z2$1 = 0;
var x00$1;
var y00$1;
var x0$3;
var y0$3;

var centroidStream$1 = {
  point: centroidPoint$1,
  lineStart: centroidLineStart$1,
  lineEnd: centroidLineEnd$1,
  polygonStart: function() {
    centroidStream$1.lineStart = centroidRingStart$1;
    centroidStream$1.lineEnd = centroidRingEnd$1;
  },
  polygonEnd: function() {
    centroidStream$1.point = centroidPoint$1;
    centroidStream$1.lineStart = centroidLineStart$1;
    centroidStream$1.lineEnd = centroidLineEnd$1;
  },
  result: function() {
    var centroid = Z2$1 ? [X2$1 / Z2$1, Y2$1 / Z2$1]
        : Z1$1 ? [X1$1 / Z1$1, Y1$1 / Z1$1]
        : Z0$1 ? [X0$1 / Z0$1, Y0$1 / Z0$1]
        : [NaN, NaN];
    X0$1 = Y0$1 = Z0$1 =
    X1$1 = Y1$1 = Z1$1 =
    X2$1 = Y2$1 = Z2$1 = 0;
    return centroid;
  }
};

function centroidPoint$1(x, y) {
  X0$1 += x;
  Y0$1 += y;
  ++Z0$1;
}

function centroidLineStart$1() {
  centroidStream$1.point = centroidPointFirstLine;
}

function centroidPointFirstLine(x, y) {
  centroidStream$1.point = centroidPointLine;
  centroidPoint$1(x0$3 = x, y0$3 = y);
}

function centroidPointLine(x, y) {
  var dx = x - x0$3, dy = y - y0$3, z = sqrt(dx * dx + dy * dy);
  X1$1 += z * (x0$3 + x) / 2;
  Y1$1 += z * (y0$3 + y) / 2;
  Z1$1 += z;
  centroidPoint$1(x0$3 = x, y0$3 = y);
}

function centroidLineEnd$1() {
  centroidStream$1.point = centroidPoint$1;
}

function centroidRingStart$1() {
  centroidStream$1.point = centroidPointFirstRing;
}

function centroidRingEnd$1() {
  centroidPointRing(x00$1, y00$1);
}

function centroidPointFirstRing(x, y) {
  centroidStream$1.point = centroidPointRing;
  centroidPoint$1(x00$1 = x0$3 = x, y00$1 = y0$3 = y);
}

function centroidPointRing(x, y) {
  var dx = x - x0$3,
      dy = y - y0$3,
      z = sqrt(dx * dx + dy * dy);

  X1$1 += z * (x0$3 + x) / 2;
  Y1$1 += z * (y0$3 + y) / 2;
  Z1$1 += z;

  z = y0$3 * x - x0$3 * y;
  X2$1 += z * (x0$3 + x);
  Y2$1 += z * (y0$3 + y);
  Z2$1 += z * 3;
  centroidPoint$1(x0$3 = x, y0$3 = y);
}

function PathContext(context) {
  this._context = context;
}

PathContext.prototype = {
  _radius: 4.5,
  pointRadius: function(_) {
    return this._radius = _, this;
  },
  polygonStart: function() {
    this._line = 0;
  },
  polygonEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._point = 0;
  },
  lineEnd: function() {
    if (this._line === 0) this._context.closePath();
    this._point = NaN;
  },
  point: function(x, y) {
    switch (this._point) {
      case 0: {
        this._context.moveTo(x, y);
        this._point = 1;
        break;
      }
      case 1: {
        this._context.lineTo(x, y);
        break;
      }
      default: {
        this._context.moveTo(x + this._radius, y);
        this._context.arc(x, y, this._radius, 0, tau$3);
        break;
      }
    }
  },
  result: noop$1
};

var lengthSum$1 = adder();
var lengthRing;
var x00$2;
var y00$2;
var x0$4;
var y0$4;

var lengthStream$1 = {
  point: noop$1,
  lineStart: function() {
    lengthStream$1.point = lengthPointFirst$1;
  },
  lineEnd: function() {
    if (lengthRing) lengthPoint$1(x00$2, y00$2);
    lengthStream$1.point = noop$1;
  },
  polygonStart: function() {
    lengthRing = true;
  },
  polygonEnd: function() {
    lengthRing = null;
  },
  result: function() {
    var length = +lengthSum$1;
    lengthSum$1.reset();
    return length;
  }
};

function lengthPointFirst$1(x, y) {
  lengthStream$1.point = lengthPoint$1;
  x00$2 = x0$4 = x, y00$2 = y0$4 = y;
}

function lengthPoint$1(x, y) {
  x0$4 -= x, y0$4 -= y;
  lengthSum$1.add(sqrt(x0$4 * x0$4 + y0$4 * y0$4));
  x0$4 = x, y0$4 = y;
}

function PathString() {
  this._string = [];
}

PathString.prototype = {
  _radius: 4.5,
  _circle: circle$1(4.5),
  pointRadius: function(_) {
    if ((_ = +_) !== this._radius) this._radius = _, this._circle = null;
    return this;
  },
  polygonStart: function() {
    this._line = 0;
  },
  polygonEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._point = 0;
  },
  lineEnd: function() {
    if (this._line === 0) this._string.push("Z");
    this._point = NaN;
  },
  point: function(x, y) {
    switch (this._point) {
      case 0: {
        this._string.push("M", x, ",", y);
        this._point = 1;
        break;
      }
      case 1: {
        this._string.push("L", x, ",", y);
        break;
      }
      default: {
        if (this._circle == null) this._circle = circle$1(this._radius);
        this._string.push("M", x, ",", y, this._circle);
        break;
      }
    }
  },
  result: function() {
    if (this._string.length) {
      var result = this._string.join("");
      this._string = [];
      return result;
    } else {
      return null;
    }
  }
};

function circle$1(radius) {
  return "m0," + radius
      + "a" + radius + "," + radius + " 0 1,1 0," + -2 * radius
      + "a" + radius + "," + radius + " 0 1,1 0," + 2 * radius
      + "z";
}

var index$1 = function(projection, context) {
  var pointRadius = 4.5,
      projectionStream,
      contextStream;

  function path(object) {
    if (object) {
      if (typeof pointRadius === "function") contextStream.pointRadius(+pointRadius.apply(this, arguments));
      geoStream(object, projectionStream(contextStream));
    }
    return contextStream.result();
  }

  path.area = function(object) {
    geoStream(object, projectionStream(areaStream$1));
    return areaStream$1.result();
  };

  path.measure = function(object) {
    geoStream(object, projectionStream(lengthStream$1));
    return lengthStream$1.result();
  };

  path.bounds = function(object) {
    geoStream(object, projectionStream(boundsStream$1));
    return boundsStream$1.result();
  };

  path.centroid = function(object) {
    geoStream(object, projectionStream(centroidStream$1));
    return centroidStream$1.result();
  };

  path.projection = function(_) {
    return arguments.length ? (projectionStream = _ == null ? (projection = null, identity$5) : (projection = _).stream, path) : projection;
  };

  path.context = function(_) {
    if (!arguments.length) return context;
    contextStream = _ == null ? (context = null, new PathString) : new PathContext(context = _);
    if (typeof pointRadius !== "function") contextStream.pointRadius(pointRadius);
    return path;
  };

  path.pointRadius = function(_) {
    if (!arguments.length) return pointRadius;
    pointRadius = typeof _ === "function" ? _ : (contextStream.pointRadius(+_), +_);
    return path;
  };

  return path.projection(projection).context(context);
};

var clip = function(pointVisible, clipLine, interpolate, start) {
  return function(rotate, sink) {
    var line = clipLine(sink),
        rotatedStart = rotate.invert(start[0], start[1]),
        ringBuffer = clipBuffer(),
        ringSink = clipLine(ringBuffer),
        polygonStarted = false,
        polygon,
        segments,
        ring;

    var clip = {
      point: point,
      lineStart: lineStart,
      lineEnd: lineEnd,
      polygonStart: function() {
        clip.point = pointRing;
        clip.lineStart = ringStart;
        clip.lineEnd = ringEnd;
        segments = [];
        polygon = [];
      },
      polygonEnd: function() {
        clip.point = point;
        clip.lineStart = lineStart;
        clip.lineEnd = lineEnd;
        segments = merge$1(segments);
        var startInside = polygonContains(polygon, rotatedStart);
        if (segments.length) {
          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
          clipPolygon(segments, compareIntersection, startInside, interpolate, sink);
        } else if (startInside) {
          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
          sink.lineStart();
          interpolate(null, null, 1, sink);
          sink.lineEnd();
        }
        if (polygonStarted) sink.polygonEnd(), polygonStarted = false;
        segments = polygon = null;
      },
      sphere: function() {
        sink.polygonStart();
        sink.lineStart();
        interpolate(null, null, 1, sink);
        sink.lineEnd();
        sink.polygonEnd();
      }
    };

    function point(lambda, phi) {
      var point = rotate(lambda, phi);
      if (pointVisible(lambda = point[0], phi = point[1])) sink.point(lambda, phi);
    }

    function pointLine(lambda, phi) {
      var point = rotate(lambda, phi);
      line.point(point[0], point[1]);
    }

    function lineStart() {
      clip.point = pointLine;
      line.lineStart();
    }

    function lineEnd() {
      clip.point = point;
      line.lineEnd();
    }

    function pointRing(lambda, phi) {
      ring.push([lambda, phi]);
      var point = rotate(lambda, phi);
      ringSink.point(point[0], point[1]);
    }

    function ringStart() {
      ringSink.lineStart();
      ring = [];
    }

    function ringEnd() {
      pointRing(ring[0][0], ring[0][1]);
      ringSink.lineEnd();

      var clean = ringSink.clean(),
          ringSegments = ringBuffer.result(),
          i, n = ringSegments.length, m,
          segment,
          point;

      ring.pop();
      polygon.push(ring);
      ring = null;

      if (!n) return;

      // No intersections.
      if (clean & 1) {
        segment = ringSegments[0];
        if ((m = segment.length - 1) > 0) {
          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
          sink.lineStart();
          for (i = 0; i < m; ++i) sink.point((point = segment[i])[0], point[1]);
          sink.lineEnd();
        }
        return;
      }

      // Rejoin connected segments.
      // TODO reuse ringBuffer.rejoin()?
      if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift()));

      segments.push(ringSegments.filter(validSegment));
    }

    return clip;
  };
};

function validSegment(segment) {
  return segment.length > 1;
}

// Intersections are sorted along the clip edge. For both antimeridian cutting
// and circle clipping, the same comparison is used.
function compareIntersection(a, b) {
  return ((a = a.x)[0] < 0 ? a[1] - halfPi$2 - epsilon$2 : halfPi$2 - a[1])
       - ((b = b.x)[0] < 0 ? b[1] - halfPi$2 - epsilon$2 : halfPi$2 - b[1]);
}

var clipAntimeridian = clip(
  function() { return true; },
  clipAntimeridianLine,
  clipAntimeridianInterpolate,
  [-pi$3, -halfPi$2]
);

// Takes a line and cuts into visible segments. Return values: 0 - there were
// intersections or the line was empty; 1 - no intersections; 2 - there were
// intersections, and the first and last segments should be rejoined.
function clipAntimeridianLine(stream) {
  var lambda0 = NaN,
      phi0 = NaN,
      sign0 = NaN,
      clean; // no intersections

  return {
    lineStart: function() {
      stream.lineStart();
      clean = 1;
    },
    point: function(lambda1, phi1) {
      var sign1 = lambda1 > 0 ? pi$3 : -pi$3,
          delta = abs(lambda1 - lambda0);
      if (abs(delta - pi$3) < epsilon$2) { // line crosses a pole
        stream.point(lambda0, phi0 = (phi0 + phi1) / 2 > 0 ? halfPi$2 : -halfPi$2);
        stream.point(sign0, phi0);
        stream.lineEnd();
        stream.lineStart();
        stream.point(sign1, phi0);
        stream.point(lambda1, phi0);
        clean = 0;
      } else if (sign0 !== sign1 && delta >= pi$3) { // line crosses antimeridian
        if (abs(lambda0 - sign0) < epsilon$2) lambda0 -= sign0 * epsilon$2; // handle degeneracies
        if (abs(lambda1 - sign1) < epsilon$2) lambda1 -= sign1 * epsilon$2;
        phi0 = clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1);
        stream.point(sign0, phi0);
        stream.lineEnd();
        stream.lineStart();
        stream.point(sign1, phi0);
        clean = 0;
      }
      stream.point(lambda0 = lambda1, phi0 = phi1);
      sign0 = sign1;
    },
    lineEnd: function() {
      stream.lineEnd();
      lambda0 = phi0 = NaN;
    },
    clean: function() {
      return 2 - clean; // if intersections, rejoin first and last segments
    }
  };
}

function clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1) {
  var cosPhi0,
      cosPhi1,
      sinLambda0Lambda1 = sin$1(lambda0 - lambda1);
  return abs(sinLambda0Lambda1) > epsilon$2
      ? atan((sin$1(phi0) * (cosPhi1 = cos$1(phi1)) * sin$1(lambda1)
          - sin$1(phi1) * (cosPhi0 = cos$1(phi0)) * sin$1(lambda0))
          / (cosPhi0 * cosPhi1 * sinLambda0Lambda1))
      : (phi0 + phi1) / 2;
}

function clipAntimeridianInterpolate(from, to, direction, stream) {
  var phi;
  if (from == null) {
    phi = direction * halfPi$2;
    stream.point(-pi$3, phi);
    stream.point(0, phi);
    stream.point(pi$3, phi);
    stream.point(pi$3, 0);
    stream.point(pi$3, -phi);
    stream.point(0, -phi);
    stream.point(-pi$3, -phi);
    stream.point(-pi$3, 0);
    stream.point(-pi$3, phi);
  } else if (abs(from[0] - to[0]) > epsilon$2) {
    var lambda = from[0] < to[0] ? pi$3 : -pi$3;
    phi = direction * lambda / 2;
    stream.point(-lambda, phi);
    stream.point(0, phi);
    stream.point(lambda, phi);
  } else {
    stream.point(to[0], to[1]);
  }
}

var clipCircle = function(radius, delta) {
  var cr = cos$1(radius),
      smallRadius = cr > 0,
      notHemisphere = abs(cr) > epsilon$2; // TODO optimise for this common case

  function interpolate(from, to, direction, stream) {
    circleStream(stream, radius, delta, direction, from, to);
  }

  function visible(lambda, phi) {
    return cos$1(lambda) * cos$1(phi) > cr;
  }

  // Takes a line and cuts into visible segments. Return values used for polygon
  // clipping: 0 - there were intersections or the line was empty; 1 - no
  // intersections 2 - there were intersections, and the first and last segments
  // should be rejoined.
  function clipLine(stream) {
    var point0, // previous point
        c0, // code for previous point
        v0, // visibility of previous point
        v00, // visibility of first point
        clean; // no intersections
    return {
      lineStart: function() {
        v00 = v0 = false;
        clean = 1;
      },
      point: function(lambda, phi) {
        var point1 = [lambda, phi],
            point2,
            v = visible(lambda, phi),
            c = smallRadius
              ? v ? 0 : code(lambda, phi)
              : v ? code(lambda + (lambda < 0 ? pi$3 : -pi$3), phi) : 0;
        if (!point0 && (v00 = v0 = v)) stream.lineStart();
        // Handle degeneracies.
        // TODO ignore if not clipping polygons.
        if (v !== v0) {
          point2 = intersect(point0, point1);
          if (!point2 || pointEqual(point0, point2) || pointEqual(point1, point2)) {
            point1[0] += epsilon$2;
            point1[1] += epsilon$2;
            v = visible(point1[0], point1[1]);
          }
        }
        if (v !== v0) {
          clean = 0;
          if (v) {
            // outside going in
            stream.lineStart();
            point2 = intersect(point1, point0);
            stream.point(point2[0], point2[1]);
          } else {
            // inside going out
            point2 = intersect(point0, point1);
            stream.point(point2[0], point2[1]);
            stream.lineEnd();
          }
          point0 = point2;
        } else if (notHemisphere && point0 && smallRadius ^ v) {
          var t;
          // If the codes for two points are different, or are both zero,
          // and there this segment intersects with the small circle.
          if (!(c & c0) && (t = intersect(point1, point0, true))) {
            clean = 0;
            if (smallRadius) {
              stream.lineStart();
              stream.point(t[0][0], t[0][1]);
              stream.point(t[1][0], t[1][1]);
              stream.lineEnd();
            } else {
              stream.point(t[1][0], t[1][1]);
              stream.lineEnd();
              stream.lineStart();
              stream.point(t[0][0], t[0][1]);
            }
          }
        }
        if (v && (!point0 || !pointEqual(point0, point1))) {
          stream.point(point1[0], point1[1]);
        }
        point0 = point1, v0 = v, c0 = c;
      },
      lineEnd: function() {
        if (v0) stream.lineEnd();
        point0 = null;
      },
      // Rejoin first and last segments if there were intersections and the first
      // and last points were visible.
      clean: function() {
        return clean | ((v00 && v0) << 1);
      }
    };
  }

  // Intersects the great circle between a and b with the clip circle.
  function intersect(a, b, two) {
    var pa = cartesian(a),
        pb = cartesian(b);

    // We have two planes, n1.p = d1 and n2.p = d2.
    // Find intersection line p(t) = c1 n1 + c2 n2 + t (n1 ⨯ n2).
    var n1 = [1, 0, 0], // normal
        n2 = cartesianCross(pa, pb),
        n2n2 = cartesianDot(n2, n2),
        n1n2 = n2[0], // cartesianDot(n1, n2),
        determinant = n2n2 - n1n2 * n1n2;

    // Two polar points.
    if (!determinant) return !two && a;

    var c1 =  cr * n2n2 / determinant,
        c2 = -cr * n1n2 / determinant,
        n1xn2 = cartesianCross(n1, n2),
        A = cartesianScale(n1, c1),
        B = cartesianScale(n2, c2);
    cartesianAddInPlace(A, B);

    // Solve |p(t)|^2 = 1.
    var u = n1xn2,
        w = cartesianDot(A, u),
        uu = cartesianDot(u, u),
        t2 = w * w - uu * (cartesianDot(A, A) - 1);

    if (t2 < 0) return;

    var t = sqrt(t2),
        q = cartesianScale(u, (-w - t) / uu);
    cartesianAddInPlace(q, A);
    q = spherical(q);

    if (!two) return q;

    // Two intersection points.
    var lambda0 = a[0],
        lambda1 = b[0],
        phi0 = a[1],
        phi1 = b[1],
        z;

    if (lambda1 < lambda0) z = lambda0, lambda0 = lambda1, lambda1 = z;

    var delta = lambda1 - lambda0,
        polar = abs(delta - pi$3) < epsilon$2,
        meridian = polar || delta < epsilon$2;

    if (!polar && phi1 < phi0) z = phi0, phi0 = phi1, phi1 = z;

    // Check that the first point is between a and b.
    if (meridian
        ? polar
          ? phi0 + phi1 > 0 ^ q[1] < (abs(q[0] - lambda0) < epsilon$2 ? phi0 : phi1)
          : phi0 <= q[1] && q[1] <= phi1
        : delta > pi$3 ^ (lambda0 <= q[0] && q[0] <= lambda1)) {
      var q1 = cartesianScale(u, (-w + t) / uu);
      cartesianAddInPlace(q1, A);
      return [q, spherical(q1)];
    }
  }

  // Generates a 4-bit vector representing the location of a point relative to
  // the small circle's bounding box.
  function code(lambda, phi) {
    var r = smallRadius ? radius : pi$3 - radius,
        code = 0;
    if (lambda < -r) code |= 1; // left
    else if (lambda > r) code |= 2; // right
    if (phi < -r) code |= 4; // below
    else if (phi > r) code |= 8; // above
    return code;
  }

  return clip(visible, clipLine, interpolate, smallRadius ? [0, -radius] : [-pi$3, radius - pi$3]);
};

var transform = function(methods) {
  return {
    stream: transformer(methods)
  };
};

function transformer(methods) {
  return function(stream) {
    var s = new TransformStream;
    for (var key in methods) s[key] = methods[key];
    s.stream = stream;
    return s;
  };
}

function TransformStream() {}

TransformStream.prototype = {
  constructor: TransformStream,
  point: function(x, y) { this.stream.point(x, y); },
  sphere: function() { this.stream.sphere(); },
  lineStart: function() { this.stream.lineStart(); },
  lineEnd: function() { this.stream.lineEnd(); },
  polygonStart: function() { this.stream.polygonStart(); },
  polygonEnd: function() { this.stream.polygonEnd(); }
};

function fitExtent(projection, extent, object) {
  var w = extent[1][0] - extent[0][0],
      h = extent[1][1] - extent[0][1],
      clip = projection.clipExtent && projection.clipExtent();

  projection
      .scale(150)
      .translate([0, 0]);

  if (clip != null) projection.clipExtent(null);

  geoStream(object, projection.stream(boundsStream$1));

  var b = boundsStream$1.result(),
      k = Math.min(w / (b[1][0] - b[0][0]), h / (b[1][1] - b[0][1])),
      x = +extent[0][0] + (w - k * (b[1][0] + b[0][0])) / 2,
      y = +extent[0][1] + (h - k * (b[1][1] + b[0][1])) / 2;

  if (clip != null) projection.clipExtent(clip);

  return projection
      .scale(k * 150)
      .translate([x, y]);
}

function fitSize(projection, size, object) {
  return fitExtent(projection, [[0, 0], size], object);
}

var maxDepth = 16;
var cosMinDistance = cos$1(30 * radians); // cos(minimum angular distance)

var resample = function(project, delta2) {
  return +delta2 ? resample$1(project, delta2) : resampleNone(project);
};

function resampleNone(project) {
  return transformer({
    point: function(x, y) {
      x = project(x, y);
      this.stream.point(x[0], x[1]);
    }
  });
}

function resample$1(project, delta2) {

  function resampleLineTo(x0, y0, lambda0, a0, b0, c0, x1, y1, lambda1, a1, b1, c1, depth, stream) {
    var dx = x1 - x0,
        dy = y1 - y0,
        d2 = dx * dx + dy * dy;
    if (d2 > 4 * delta2 && depth--) {
      var a = a0 + a1,
          b = b0 + b1,
          c = c0 + c1,
          m = sqrt(a * a + b * b + c * c),
          phi2 = asin(c /= m),
          lambda2 = abs(abs(c) - 1) < epsilon$2 || abs(lambda0 - lambda1) < epsilon$2 ? (lambda0 + lambda1) / 2 : atan2(b, a),
          p = project(lambda2, phi2),
          x2 = p[0],
          y2 = p[1],
          dx2 = x2 - x0,
          dy2 = y2 - y0,
          dz = dy * dx2 - dx * dy2;
      if (dz * dz / d2 > delta2 // perpendicular projected distance
          || abs((dx * dx2 + dy * dy2) / d2 - 0.5) > 0.3 // midpoint close to an end
          || a0 * a1 + b0 * b1 + c0 * c1 < cosMinDistance) { // angular distance
        resampleLineTo(x0, y0, lambda0, a0, b0, c0, x2, y2, lambda2, a /= m, b /= m, c, depth, stream);
        stream.point(x2, y2);
        resampleLineTo(x2, y2, lambda2, a, b, c, x1, y1, lambda1, a1, b1, c1, depth, stream);
      }
    }
  }
  return function(stream) {
    var lambda00, x00, y00, a00, b00, c00, // first point
        lambda0, x0, y0, a0, b0, c0; // previous point

    var resampleStream = {
      point: point,
      lineStart: lineStart,
      lineEnd: lineEnd,
      polygonStart: function() { stream.polygonStart(); resampleStream.lineStart = ringStart; },
      polygonEnd: function() { stream.polygonEnd(); resampleStream.lineStart = lineStart; }
    };

    function point(x, y) {
      x = project(x, y);
      stream.point(x[0], x[1]);
    }

    function lineStart() {
      x0 = NaN;
      resampleStream.point = linePoint;
      stream.lineStart();
    }

    function linePoint(lambda, phi) {
      var c = cartesian([lambda, phi]), p = project(lambda, phi);
      resampleLineTo(x0, y0, lambda0, a0, b0, c0, x0 = p[0], y0 = p[1], lambda0 = lambda, a0 = c[0], b0 = c[1], c0 = c[2], maxDepth, stream);
      stream.point(x0, y0);
    }

    function lineEnd() {
      resampleStream.point = point;
      stream.lineEnd();
    }

    function ringStart() {
      lineStart();
      resampleStream.point = ringPoint;
      resampleStream.lineEnd = ringEnd;
    }

    function ringPoint(lambda, phi) {
      linePoint(lambda00 = lambda, phi), x00 = x0, y00 = y0, a00 = a0, b00 = b0, c00 = c0;
      resampleStream.point = linePoint;
    }

    function ringEnd() {
      resampleLineTo(x0, y0, lambda0, a0, b0, c0, x00, y00, lambda00, a00, b00, c00, maxDepth, stream);
      resampleStream.lineEnd = lineEnd;
      lineEnd();
    }

    return resampleStream;
  };
}

var transformRadians = transformer({
  point: function(x, y) {
    this.stream.point(x * radians, y * radians);
  }
});

function projection(project) {
  return projectionMutator(function() { return project; })();
}

function projectionMutator(projectAt) {
  var project,
      k = 150, // scale
      x = 480, y = 250, // translate
      dx, dy, lambda = 0, phi = 0, // center
      deltaLambda = 0, deltaPhi = 0, deltaGamma = 0, rotate, projectRotate, // rotate
      theta = null, preclip = clipAntimeridian, // clip angle
      x0 = null, y0, x1, y1, postclip = identity$5, // clip extent
      delta2 = 0.5, projectResample = resample(projectTransform, delta2), // precision
      cache,
      cacheStream;

  function projection(point) {
    point = projectRotate(point[0] * radians, point[1] * radians);
    return [point[0] * k + dx, dy - point[1] * k];
  }

  function invert(point) {
    point = projectRotate.invert((point[0] - dx) / k, (dy - point[1]) / k);
    return point && [point[0] * degrees$1, point[1] * degrees$1];
  }

  function projectTransform(x, y) {
    return x = project(x, y), [x[0] * k + dx, dy - x[1] * k];
  }

  projection.stream = function(stream) {
    return cache && cacheStream === stream ? cache : cache = transformRadians(preclip(rotate, projectResample(postclip(cacheStream = stream))));
  };

  projection.clipAngle = function(_) {
    return arguments.length ? (preclip = +_ ? clipCircle(theta = _ * radians, 6 * radians) : (theta = null, clipAntimeridian), reset()) : theta * degrees$1;
  };

  projection.clipExtent = function(_) {
    return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$5) : clipExtent(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
  };

  projection.scale = function(_) {
    return arguments.length ? (k = +_, recenter()) : k;
  };

  projection.translate = function(_) {
    return arguments.length ? (x = +_[0], y = +_[1], recenter()) : [x, y];
  };

  projection.center = function(_) {
    return arguments.length ? (lambda = _[0] % 360 * radians, phi = _[1] % 360 * radians, recenter()) : [lambda * degrees$1, phi * degrees$1];
  };

  projection.rotate = function(_) {
    return arguments.length ? (deltaLambda = _[0] % 360 * radians, deltaPhi = _[1] % 360 * radians, deltaGamma = _.length > 2 ? _[2] % 360 * radians : 0, recenter()) : [deltaLambda * degrees$1, deltaPhi * degrees$1, deltaGamma * degrees$1];
  };

  projection.precision = function(_) {
    return arguments.length ? (projectResample = resample(projectTransform, delta2 = _ * _), reset()) : sqrt(delta2);
  };

  projection.fitExtent = function(extent, object) {
    return fitExtent(projection, extent, object);
  };

  projection.fitSize = function(size, object) {
    return fitSize(projection, size, object);
  };

  function recenter() {
    projectRotate = compose(rotate = rotateRadians(deltaLambda, deltaPhi, deltaGamma), project);
    var center = project(lambda, phi);
    dx = x - center[0] * k;
    dy = y + center[1] * k;
    return reset();
  }

  function reset() {
    cache = cacheStream = null;
    return projection;
  }

  return function() {
    project = projectAt.apply(this, arguments);
    projection.invert = project.invert && invert;
    return recenter();
  };
}

function conicProjection(projectAt) {
  var phi0 = 0,
      phi1 = pi$3 / 3,
      m = projectionMutator(projectAt),
      p = m(phi0, phi1);

  p.parallels = function(_) {
    return arguments.length ? m(phi0 = _[0] * radians, phi1 = _[1] * radians) : [phi0 * degrees$1, phi1 * degrees$1];
  };

  return p;
}

function cylindricalEqualAreaRaw(phi0) {
  var cosPhi0 = cos$1(phi0);

  function forward(lambda, phi) {
    return [lambda * cosPhi0, sin$1(phi) / cosPhi0];
  }

  forward.invert = function(x, y) {
    return [x / cosPhi0, asin(y * cosPhi0)];
  };

  return forward;
}

function conicEqualAreaRaw(y0, y1) {
  var sy0 = sin$1(y0), n = (sy0 + sin$1(y1)) / 2;

  // Are the parallels symmetrical around the Equator?
  if (abs(n) < epsilon$2) return cylindricalEqualAreaRaw(y0);

  var c = 1 + sy0 * (2 * n - sy0), r0 = sqrt(c) / n;

  function project(x, y) {
    var r = sqrt(c - 2 * n * sin$1(y)) / n;
    return [r * sin$1(x *= n), r0 - r * cos$1(x)];
  }

  project.invert = function(x, y) {
    var r0y = r0 - y;
    return [atan2(x, abs(r0y)) / n * sign(r0y), asin((c - (x * x + r0y * r0y) * n * n) / (2 * n))];
  };

  return project;
}

var conicEqualArea = function() {
  return conicProjection(conicEqualAreaRaw)
      .scale(155.424)
      .center([0, 33.6442]);
};

var albers = function() {
  return conicEqualArea()
      .parallels([29.5, 45.5])
      .scale(1070)
      .translate([480, 250])
      .rotate([96, 0])
      .center([-0.6, 38.7]);
};

// The projections must have mutually exclusive clip regions on the sphere,
// as this will avoid emitting interleaving lines and polygons.
function multiplex(streams) {
  var n = streams.length;
  return {
    point: function(x, y) { var i = -1; while (++i < n) streams[i].point(x, y); },
    sphere: function() { var i = -1; while (++i < n) streams[i].sphere(); },
    lineStart: function() { var i = -1; while (++i < n) streams[i].lineStart(); },
    lineEnd: function() { var i = -1; while (++i < n) streams[i].lineEnd(); },
    polygonStart: function() { var i = -1; while (++i < n) streams[i].polygonStart(); },
    polygonEnd: function() { var i = -1; while (++i < n) streams[i].polygonEnd(); }
  };
}

// A composite projection for the United States, configured by default for
// 960×500. The projection also works quite well at 960×600 if you change the
// scale to 1285 and adjust the translate accordingly. The set of standard
// parallels for each region comes from USGS, which is published here:
// http://egsc.usgs.gov/isb/pubs/MapProjections/projections.html#albers
var albersUsa = function() {
  var cache,
      cacheStream,
      lower48 = albers(), lower48Point,
      alaska = conicEqualArea().rotate([154, 0]).center([-2, 58.5]).parallels([55, 65]), alaskaPoint, // EPSG:3338
      hawaii = conicEqualArea().rotate([157, 0]).center([-3, 19.9]).parallels([8, 18]), hawaiiPoint, // ESRI:102007
      point, pointStream = {point: function(x, y) { point = [x, y]; }};

  function albersUsa(coordinates) {
    var x = coordinates[0], y = coordinates[1];
    return point = null,
        (lower48Point.point(x, y), point)
        || (alaskaPoint.point(x, y), point)
        || (hawaiiPoint.point(x, y), point);
  }

  albersUsa.invert = function(coordinates) {
    var k = lower48.scale(),
        t = lower48.translate(),
        x = (coordinates[0] - t[0]) / k,
        y = (coordinates[1] - t[1]) / k;
    return (y >= 0.120 && y < 0.234 && x >= -0.425 && x < -0.214 ? alaska
        : y >= 0.166 && y < 0.234 && x >= -0.214 && x < -0.115 ? hawaii
        : lower48).invert(coordinates);
  };

  albersUsa.stream = function(stream) {
    return cache && cacheStream === stream ? cache : cache = multiplex([lower48.stream(cacheStream = stream), alaska.stream(stream), hawaii.stream(stream)]);
  };

  albersUsa.precision = function(_) {
    if (!arguments.length) return lower48.precision();
    lower48.precision(_), alaska.precision(_), hawaii.precision(_);
    return reset();
  };

  albersUsa.scale = function(_) {
    if (!arguments.length) return lower48.scale();
    lower48.scale(_), alaska.scale(_ * 0.35), hawaii.scale(_);
    return albersUsa.translate(lower48.translate());
  };

  albersUsa.translate = function(_) {
    if (!arguments.length) return lower48.translate();
    var k = lower48.scale(), x = +_[0], y = +_[1];

    lower48Point = lower48
        .translate(_)
        .clipExtent([[x - 0.455 * k, y - 0.238 * k], [x + 0.455 * k, y + 0.238 * k]])
        .stream(pointStream);

    alaskaPoint = alaska
        .translate([x - 0.307 * k, y + 0.201 * k])
        .clipExtent([[x - 0.425 * k + epsilon$2, y + 0.120 * k + epsilon$2], [x - 0.214 * k - epsilon$2, y + 0.234 * k - epsilon$2]])
        .stream(pointStream);

    hawaiiPoint = hawaii
        .translate([x - 0.205 * k, y + 0.212 * k])
        .clipExtent([[x - 0.214 * k + epsilon$2, y + 0.166 * k + epsilon$2], [x - 0.115 * k - epsilon$2, y + 0.234 * k - epsilon$2]])
        .stream(pointStream);

    return reset();
  };

  albersUsa.fitExtent = function(extent, object) {
    return fitExtent(albersUsa, extent, object);
  };

  albersUsa.fitSize = function(size, object) {
    return fitSize(albersUsa, size, object);
  };

  function reset() {
    cache = cacheStream = null;
    return albersUsa;
  }

  return albersUsa.scale(1070);
};

function azimuthalRaw(scale) {
  return function(x, y) {
    var cx = cos$1(x),
        cy = cos$1(y),
        k = scale(cx * cy);
    return [
      k * cy * sin$1(x),
      k * sin$1(y)
    ];
  }
}

function azimuthalInvert(angle) {
  return function(x, y) {
    var z = sqrt(x * x + y * y),
        c = angle(z),
        sc = sin$1(c),
        cc = cos$1(c);
    return [
      atan2(x * sc, z * cc),
      asin(z && y * sc / z)
    ];
  }
}

var azimuthalEqualAreaRaw = azimuthalRaw(function(cxcy) {
  return sqrt(2 / (1 + cxcy));
});

azimuthalEqualAreaRaw.invert = azimuthalInvert(function(z) {
  return 2 * asin(z / 2);
});

var azimuthalEqualArea = function() {
  return projection(azimuthalEqualAreaRaw)
      .scale(124.75)
      .clipAngle(180 - 1e-3);
};

var azimuthalEquidistantRaw = azimuthalRaw(function(c) {
  return (c = acos(c)) && c / sin$1(c);
});

azimuthalEquidistantRaw.invert = azimuthalInvert(function(z) {
  return z;
});

var azimuthalEquidistant = function() {
  return projection(azimuthalEquidistantRaw)
      .scale(79.4188)
      .clipAngle(180 - 1e-3);
};

function mercatorRaw(lambda, phi) {
  return [lambda, log(tan((halfPi$2 + phi) / 2))];
}

mercatorRaw.invert = function(x, y) {
  return [x, 2 * atan(exp(y)) - halfPi$2];
};

var mercator = function() {
  return mercatorProjection(mercatorRaw)
      .scale(961 / tau$3);
};

function mercatorProjection(project) {
  var m = projection(project),
      center = m.center,
      scale = m.scale,
      translate = m.translate,
      clipExtent = m.clipExtent,
      x0 = null, y0, x1, y1; // clip extent

  m.scale = function(_) {
    return arguments.length ? (scale(_), reclip()) : scale();
  };

  m.translate = function(_) {
    return arguments.length ? (translate(_), reclip()) : translate();
  };

  m.center = function(_) {
    return arguments.length ? (center(_), reclip()) : center();
  };

  m.clipExtent = function(_) {
    return arguments.length ? ((_ == null ? x0 = y0 = x1 = y1 = null : (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1])), reclip()) : x0 == null ? null : [[x0, y0], [x1, y1]];
  };

  function reclip() {
    var k = pi$3 * scale(),
        t = m(rotation(m.rotate()).invert([0, 0]));
    return clipExtent(x0 == null
        ? [[t[0] - k, t[1] - k], [t[0] + k, t[1] + k]] : project === mercatorRaw
        ? [[Math.max(t[0] - k, x0), y0], [Math.min(t[0] + k, x1), y1]]
        : [[x0, Math.max(t[1] - k, y0)], [x1, Math.min(t[1] + k, y1)]]);
  }

  return reclip();
}

function tany(y) {
  return tan((halfPi$2 + y) / 2);
}

function conicConformalRaw(y0, y1) {
  var cy0 = cos$1(y0),
      n = y0 === y1 ? sin$1(y0) : log(cy0 / cos$1(y1)) / log(tany(y1) / tany(y0)),
      f = cy0 * pow(tany(y0), n) / n;

  if (!n) return mercatorRaw;

  function project(x, y) {
    if (f > 0) { if (y < -halfPi$2 + epsilon$2) y = -halfPi$2 + epsilon$2; }
    else { if (y > halfPi$2 - epsilon$2) y = halfPi$2 - epsilon$2; }
    var r = f / pow(tany(y), n);
    return [r * sin$1(n * x), f - r * cos$1(n * x)];
  }

  project.invert = function(x, y) {
    var fy = f - y, r = sign(n) * sqrt(x * x + fy * fy);
    return [atan2(x, abs(fy)) / n * sign(fy), 2 * atan(pow(f / r, 1 / n)) - halfPi$2];
  };

  return project;
}

var conicConformal = function() {
  return conicProjection(conicConformalRaw)
      .scale(109.5)
      .parallels([30, 30]);
};

function equirectangularRaw(lambda, phi) {
  return [lambda, phi];
}

equirectangularRaw.invert = equirectangularRaw;

var equirectangular = function() {
  return projection(equirectangularRaw)
      .scale(152.63);
};

function conicEquidistantRaw(y0, y1) {
  var cy0 = cos$1(y0),
      n = y0 === y1 ? sin$1(y0) : (cy0 - cos$1(y1)) / (y1 - y0),
      g = cy0 / n + y0;

  if (abs(n) < epsilon$2) return equirectangularRaw;

  function project(x, y) {
    var gy = g - y, nx = n * x;
    return [gy * sin$1(nx), g - gy * cos$1(nx)];
  }

  project.invert = function(x, y) {
    var gy = g - y;
    return [atan2(x, abs(gy)) / n * sign(gy), g - sign(n) * sqrt(x * x + gy * gy)];
  };

  return project;
}

var conicEquidistant = function() {
  return conicProjection(conicEquidistantRaw)
      .scale(131.154)
      .center([0, 13.9389]);
};

function gnomonicRaw(x, y) {
  var cy = cos$1(y), k = cos$1(x) * cy;
  return [cy * sin$1(x) / k, sin$1(y) / k];
}

gnomonicRaw.invert = azimuthalInvert(atan);

var gnomonic = function() {
  return projection(gnomonicRaw)
      .scale(144.049)
      .clipAngle(60);
};

function scaleTranslate(kx, ky, tx, ty) {
  return kx === 1 && ky === 1 && tx === 0 && ty === 0 ? identity$5 : transformer({
    point: function(x, y) {
      this.stream.point(x * kx + tx, y * ky + ty);
    }
  });
}

var identity$6 = function() {
  var k = 1, tx = 0, ty = 0, sx = 1, sy = 1, transform = identity$5, // scale, translate and reflect
      x0 = null, y0, x1, y1, clip = identity$5, // clip extent
      cache,
      cacheStream,
      projection;

  function reset() {
    cache = cacheStream = null;
    return projection;
  }

  return projection = {
    stream: function(stream) {
      return cache && cacheStream === stream ? cache : cache = transform(clip(cacheStream = stream));
    },
    clipExtent: function(_) {
      return arguments.length ? (clip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$5) : clipExtent(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
    },
    scale: function(_) {
      return arguments.length ? (transform = scaleTranslate((k = +_) * sx, k * sy, tx, ty), reset()) : k;
    },
    translate: function(_) {
      return arguments.length ? (transform = scaleTranslate(k * sx, k * sy, tx = +_[0], ty = +_[1]), reset()) : [tx, ty];
    },
    reflectX: function(_) {
      return arguments.length ? (transform = scaleTranslate(k * (sx = _ ? -1 : 1), k * sy, tx, ty), reset()) : sx < 0;
    },
    reflectY: function(_) {
      return arguments.length ? (transform = scaleTranslate(k * sx, k * (sy = _ ? -1 : 1), tx, ty), reset()) : sy < 0;
    },
    fitExtent: function(extent, object) {
      return fitExtent(projection, extent, object);
    },
    fitSize: function(size, object) {
      return fitSize(projection, size, object);
    }
  };
};

function orthographicRaw(x, y) {
  return [cos$1(y) * sin$1(x), sin$1(y)];
}

orthographicRaw.invert = azimuthalInvert(asin);

var orthographic = function() {
  return projection(orthographicRaw)
      .scale(249.5)
      .clipAngle(90 + epsilon$2);
};

function stereographicRaw(x, y) {
  var cy = cos$1(y), k = 1 + cos$1(x) * cy;
  return [cy * sin$1(x) / k, sin$1(y) / k];
}

stereographicRaw.invert = azimuthalInvert(function(z) {
  return 2 * atan(z);
});

var stereographic = function() {
  return projection(stereographicRaw)
      .scale(250)
      .clipAngle(142);
};

function transverseMercatorRaw(lambda, phi) {
  return [log(tan((halfPi$2 + phi) / 2)), -lambda];
}

transverseMercatorRaw.invert = function(x, y) {
  return [-y, 2 * atan(exp(x)) - halfPi$2];
};

var transverseMercator = function() {
  var m = mercatorProjection(transverseMercatorRaw),
      center = m.center,
      rotate = m.rotate;

  m.center = function(_) {
    return arguments.length ? center([-_[1], _[0]]) : (_ = center(), [_[1], -_[0]]);
  };

  m.rotate = function(_) {
    return arguments.length ? rotate([_[0], _[1], _.length > 2 ? _[2] + 90 : 90]) : (_ = rotate(), [_[0], _[1], _[2] - 90]);
  };

  return rotate([0, 0, 90])
      .scale(159.155);
};

function defaultSeparation(a, b) {
  return a.parent === b.parent ? 1 : 2;
}

function meanX(children) {
  return children.reduce(meanXReduce, 0) / children.length;
}

function meanXReduce(x, c) {
  return x + c.x;
}

function maxY(children) {
  return 1 + children.reduce(maxYReduce, 0);
}

function maxYReduce(y, c) {
  return Math.max(y, c.y);
}

function leafLeft(node) {
  var children;
  while (children = node.children) node = children[0];
  return node;
}

function leafRight(node) {
  var children;
  while (children = node.children) node = children[children.length - 1];
  return node;
}

var cluster = function() {
  var separation = defaultSeparation,
      dx = 1,
      dy = 1,
      nodeSize = false;

  function cluster(root) {
    var previousNode,
        x = 0;

    // First walk, computing the initial x & y values.
    root.eachAfter(function(node) {
      var children = node.children;
      if (children) {
        node.x = meanX(children);
        node.y = maxY(children);
      } else {
        node.x = previousNode ? x += separation(node, previousNode) : 0;
        node.y = 0;
        previousNode = node;
      }
    });

    var left = leafLeft(root),
        right = leafRight(root),
        x0 = left.x - separation(left, right) / 2,
        x1 = right.x + separation(right, left) / 2;

    // Second walk, normalizing x & y to the desired size.
    return root.eachAfter(nodeSize ? function(node) {
      node.x = (node.x - root.x) * dx;
      node.y = (root.y - node.y) * dy;
    } : function(node) {
      node.x = (node.x - x0) / (x1 - x0) * dx;
      node.y = (1 - (root.y ? node.y / root.y : 1)) * dy;
    });
  }

  cluster.separation = function(x) {
    return arguments.length ? (separation = x, cluster) : separation;
  };

  cluster.size = function(x) {
    return arguments.length ? (nodeSize = false, dx = +x[0], dy = +x[1], cluster) : (nodeSize ? null : [dx, dy]);
  };

  cluster.nodeSize = function(x) {
    return arguments.length ? (nodeSize = true, dx = +x[0], dy = +x[1], cluster) : (nodeSize ? [dx, dy] : null);
  };

  return cluster;
};

function count(node) {
  var sum = 0,
      children = node.children,
      i = children && children.length;
  if (!i) sum = 1;
  else while (--i >= 0) sum += children[i].value;
  node.value = sum;
}

var node_count = function() {
  return this.eachAfter(count);
};

var node_each = function(callback) {
  var node = this, current, next = [node], children, i, n;
  do {
    current = next.reverse(), next = [];
    while (node = current.pop()) {
      callback(node), children = node.children;
      if (children) for (i = 0, n = children.length; i < n; ++i) {
        next.push(children[i]);
      }
    }
  } while (next.length);
  return this;
};

var node_eachBefore = function(callback) {
  var node = this, nodes = [node], children, i;
  while (node = nodes.pop()) {
    callback(node), children = node.children;
    if (children) for (i = children.length - 1; i >= 0; --i) {
      nodes.push(children[i]);
    }
  }
  return this;
};

var node_eachAfter = function(callback) {
  var node = this, nodes = [node], next = [], children, i, n;
  while (node = nodes.pop()) {
    next.push(node), children = node.children;
    if (children) for (i = 0, n = children.length; i < n; ++i) {
      nodes.push(children[i]);
    }
  }
  while (node = next.pop()) {
    callback(node);
  }
  return this;
};

var node_sum = function(value) {
  return this.eachAfter(function(node) {
    var sum = +value(node.data) || 0,
        children = node.children,
        i = children && children.length;
    while (--i >= 0) sum += children[i].value;
    node.value = sum;
  });
};

var node_sort = function(compare) {
  return this.eachBefore(function(node) {
    if (node.children) {
      node.children.sort(compare);
    }
  });
};

var node_path = function(end) {
  var start = this,
      ancestor = leastCommonAncestor(start, end),
      nodes = [start];
  while (start !== ancestor) {
    start = start.parent;
    nodes.push(start);
  }
  var k = nodes.length;
  while (end !== ancestor) {
    nodes.splice(k, 0, end);
    end = end.parent;
  }
  return nodes;
};

function leastCommonAncestor(a, b) {
  if (a === b) return a;
  var aNodes = a.ancestors(),
      bNodes = b.ancestors(),
      c = null;
  a = aNodes.pop();
  b = bNodes.pop();
  while (a === b) {
    c = a;
    a = aNodes.pop();
    b = bNodes.pop();
  }
  return c;
}

var node_ancestors = function() {
  var node = this, nodes = [node];
  while (node = node.parent) {
    nodes.push(node);
  }
  return nodes;
};

var node_descendants = function() {
  var nodes = [];
  this.each(function(node) {
    nodes.push(node);
  });
  return nodes;
};

var node_leaves = function() {
  var leaves = [];
  this.eachBefore(function(node) {
    if (!node.children) {
      leaves.push(node);
    }
  });
  return leaves;
};

var node_links = function() {
  var root = this, links = [];
  root.each(function(node) {
    if (node !== root) { // Don’t include the root’s parent, if any.
      links.push({source: node.parent, target: node});
    }
  });
  return links;
};

function hierarchy(data, children) {
  var root = new Node(data),
      valued = +data.value && (root.value = data.value),
      node,
      nodes = [root],
      child,
      childs,
      i,
      n;

  if (children == null) children = defaultChildren;

  while (node = nodes.pop()) {
    if (valued) node.value = +node.data.value;
    if ((childs = children(node.data)) && (n = childs.length)) {
      node.children = new Array(n);
      for (i = n - 1; i >= 0; --i) {
        nodes.push(child = node.children[i] = new Node(childs[i]));
        child.parent = node;
        child.depth = node.depth + 1;
      }
    }
  }

  return root.eachBefore(computeHeight);
}

function node_copy() {
  return hierarchy(this).eachBefore(copyData);
}

function defaultChildren(d) {
  return d.children;
}

function copyData(node) {
  node.data = node.data.data;
}

function computeHeight(node) {
  var height = 0;
  do node.height = height;
  while ((node = node.parent) && (node.height < ++height));
}

function Node(data) {
  this.data = data;
  this.depth =
  this.height = 0;
  this.parent = null;
}

Node.prototype = hierarchy.prototype = {
  constructor: Node,
  count: node_count,
  each: node_each,
  eachAfter: node_eachAfter,
  eachBefore: node_eachBefore,
  sum: node_sum,
  sort: node_sort,
  path: node_path,
  ancestors: node_ancestors,
  descendants: node_descendants,
  leaves: node_leaves,
  links: node_links,
  copy: node_copy
};

var slice$4 = Array.prototype.slice;

function shuffle$2(array) {
  var m = array.length,
      t,
      i;

  while (m) {
    i = Math.random() * m-- | 0;
    t = array[m];
    array[m] = array[i];
    array[i] = t;
  }

  return array;
}

var enclose = function(circles) {
  var i = 0, n = (circles = shuffle$2(slice$4.call(circles))).length, B = [], p, e;

  while (i < n) {
    p = circles[i];
    if (e && enclosesWeak(e, p)) ++i;
    else e = encloseBasis(B = extendBasis(B, p)), i = 0;
  }

  return e;
};

function extendBasis(B, p) {
  var i, j;

  if (enclosesWeakAll(p, B)) return [p];

  // If we get here then B must have at least one element.
  for (i = 0; i < B.length; ++i) {
    if (enclosesNot(p, B[i])
        && enclosesWeakAll(encloseBasis2(B[i], p), B)) {
      return [B[i], p];
    }
  }

  // If we get here then B must have at least two elements.
  for (i = 0; i < B.length - 1; ++i) {
    for (j = i + 1; j < B.length; ++j) {
      if (enclosesNot(encloseBasis2(B[i], B[j]), p)
          && enclosesNot(encloseBasis2(B[i], p), B[j])
          && enclosesNot(encloseBasis2(B[j], p), B[i])
          && enclosesWeakAll(encloseBasis3(B[i], B[j], p), B)) {
        return [B[i], B[j], p];
      }
    }
  }

  // If we get here then something is very wrong.
  throw new Error;
}

function enclosesNot(a, b) {
  var dr = a.r - b.r, dx = b.x - a.x, dy = b.y - a.y;
  return dr < 0 || dr * dr < dx * dx + dy * dy;
}

function enclosesWeak(a, b) {
  var dr = a.r - b.r + 1e-6, dx = b.x - a.x, dy = b.y - a.y;
  return dr > 0 && dr * dr > dx * dx + dy * dy;
}

function enclosesWeakAll(a, B) {
  for (var i = 0; i < B.length; ++i) {
    if (!enclosesWeak(a, B[i])) {
      return false;
    }
  }
  return true;
}

function encloseBasis(B) {
  switch (B.length) {
    case 1: return encloseBasis1(B[0]);
    case 2: return encloseBasis2(B[0], B[1]);
    case 3: return encloseBasis3(B[0], B[1], B[2]);
  }
}

function encloseBasis1(a) {
  return {
    x: a.x,
    y: a.y,
    r: a.r
  };
}

function encloseBasis2(a, b) {
  var x1 = a.x, y1 = a.y, r1 = a.r,
      x2 = b.x, y2 = b.y, r2 = b.r,
      x21 = x2 - x1, y21 = y2 - y1, r21 = r2 - r1,
      l = Math.sqrt(x21 * x21 + y21 * y21);
  return {
    x: (x1 + x2 + x21 / l * r21) / 2,
    y: (y1 + y2 + y21 / l * r21) / 2,
    r: (l + r1 + r2) / 2
  };
}

function encloseBasis3(a, b, c) {
  var x1 = a.x, y1 = a.y, r1 = a.r,
      x2 = b.x, y2 = b.y, r2 = b.r,
      x3 = c.x, y3 = c.y, r3 = c.r,
      a2 = x1 - x2,
      a3 = x1 - x3,
      b2 = y1 - y2,
      b3 = y1 - y3,
      c2 = r2 - r1,
      c3 = r3 - r1,
      d1 = x1 * x1 + y1 * y1 - r1 * r1,
      d2 = d1 - x2 * x2 - y2 * y2 + r2 * r2,
      d3 = d1 - x3 * x3 - y3 * y3 + r3 * r3,
      ab = a3 * b2 - a2 * b3,
      xa = (b2 * d3 - b3 * d2) / (ab * 2) - x1,
      xb = (b3 * c2 - b2 * c3) / ab,
      ya = (a3 * d2 - a2 * d3) / (ab * 2) - y1,
      yb = (a2 * c3 - a3 * c2) / ab,
      A = xb * xb + yb * yb - 1,
      B = 2 * (r1 + xa * xb + ya * yb),
      C = xa * xa + ya * ya - r1 * r1,
      r = -(A ? (B + Math.sqrt(B * B - 4 * A * C)) / (2 * A) : C / B);
  return {
    x: x1 + xa + xb * r,
    y: y1 + ya + yb * r,
    r: r
  };
}

function place(a, b, c) {
  var ax = a.x,
      ay = a.y,
      da = b.r + c.r,
      db = a.r + c.r,
      dx = b.x - ax,
      dy = b.y - ay,
      dc = dx * dx + dy * dy;
  if (dc) {
    var x = 0.5 + ((db *= db) - (da *= da)) / (2 * dc),
        y = Math.sqrt(Math.max(0, 2 * da * (db + dc) - (db -= dc) * db - da * da)) / (2 * dc);
    c.x = ax + x * dx + y * dy;
    c.y = ay + x * dy - y * dx;
  } else {
    c.x = ax + db;
    c.y = ay;
  }
}

function intersects(a, b) {
  var dx = b.x - a.x,
      dy = b.y - a.y,
      dr = a.r + b.r;
  return dr * dr - 1e-6 > dx * dx + dy * dy;
}

function score(node) {
  var a = node._,
      b = node.next._,
      ab = a.r + b.r,
      dx = (a.x * b.r + b.x * a.r) / ab,
      dy = (a.y * b.r + b.y * a.r) / ab;
  return dx * dx + dy * dy;
}

function Node$1(circle) {
  this._ = circle;
  this.next = null;
  this.previous = null;
}

function packEnclose(circles) {
  if (!(n = circles.length)) return 0;

  var a, b, c, n, aa, ca, i, j, k, sj, sk;

  // Place the first circle.
  a = circles[0], a.x = 0, a.y = 0;
  if (!(n > 1)) return a.r;

  // Place the second circle.
  b = circles[1], a.x = -b.r, b.x = a.r, b.y = 0;
  if (!(n > 2)) return a.r + b.r;

  // Place the third circle.
  place(b, a, c = circles[2]);

  // Initialize the front-chain using the first three circles a, b and c.
  a = new Node$1(a), b = new Node$1(b), c = new Node$1(c);
  a.next = c.previous = b;
  b.next = a.previous = c;
  c.next = b.previous = a;

  // Attempt to place each remaining circle…
  pack: for (i = 3; i < n; ++i) {
    place(a._, b._, c = circles[i]), c = new Node$1(c);

    // Find the closest intersecting circle on the front-chain, if any.
    // “Closeness” is determined by linear distance along the front-chain.
    // “Ahead” or “behind” is likewise determined by linear distance.
    j = b.next, k = a.previous, sj = b._.r, sk = a._.r;
    do {
      if (sj <= sk) {
        if (intersects(j._, c._)) {
          b = j, a.next = b, b.previous = a, --i;
          continue pack;
        }
        sj += j._.r, j = j.next;
      } else {
        if (intersects(k._, c._)) {
          a = k, a.next = b, b.previous = a, --i;
          continue pack;
        }
        sk += k._.r, k = k.previous;
      }
    } while (j !== k.next);

    // Success! Insert the new circle c between a and b.
    c.previous = a, c.next = b, a.next = b.previous = b = c;

    // Compute the new closest circle pair to the centroid.
    aa = score(a);
    while ((c = c.next) !== b) {
      if ((ca = score(c)) < aa) {
        a = c, aa = ca;
      }
    }
    b = a.next;
  }

  // Compute the enclosing circle of the front chain.
  a = [b._], c = b; while ((c = c.next) !== b) a.push(c._); c = enclose(a);

  // Translate the circles to put the enclosing circle around the origin.
  for (i = 0; i < n; ++i) a = circles[i], a.x -= c.x, a.y -= c.y;

  return c.r;
}

var siblings = function(circles) {
  packEnclose(circles);
  return circles;
};

function optional(f) {
  return f == null ? null : required(f);
}

function required(f) {
  if (typeof f !== "function") throw new Error;
  return f;
}

function constantZero() {
  return 0;
}

var constant$9 = function(x) {
  return function() {
    return x;
  };
};

function defaultRadius$1(d) {
  return Math.sqrt(d.value);
}

var index$2 = function() {
  var radius = null,
      dx = 1,
      dy = 1,
      padding = constantZero;

  function pack(root) {
    root.x = dx / 2, root.y = dy / 2;
    if (radius) {
      root.eachBefore(radiusLeaf(radius))
          .eachAfter(packChildren(padding, 0.5))
          .eachBefore(translateChild(1));
    } else {
      root.eachBefore(radiusLeaf(defaultRadius$1))
          .eachAfter(packChildren(constantZero, 1))
          .eachAfter(packChildren(padding, root.r / Math.min(dx, dy)))
          .eachBefore(translateChild(Math.min(dx, dy) / (2 * root.r)));
    }
    return root;
  }

  pack.radius = function(x) {
    return arguments.length ? (radius = optional(x), pack) : radius;
  };

  pack.size = function(x) {
    return arguments.length ? (dx = +x[0], dy = +x[1], pack) : [dx, dy];
  };

  pack.padding = function(x) {
    return arguments.length ? (padding = typeof x === "function" ? x : constant$9(+x), pack) : padding;
  };

  return pack;
};

function radiusLeaf(radius) {
  return function(node) {
    if (!node.children) {
      node.r = Math.max(0, +radius(node) || 0);
    }
  };
}

function packChildren(padding, k) {
  return function(node) {
    if (children = node.children) {
      var children,
          i,
          n = children.length,
          r = padding(node) * k || 0,
          e;

      if (r) for (i = 0; i < n; ++i) children[i].r += r;
      e = packEnclose(children);
      if (r) for (i = 0; i < n; ++i) children[i].r -= r;
      node.r = e + r;
    }
  };
}

function translateChild(k) {
  return function(node) {
    var parent = node.parent;
    node.r *= k;
    if (parent) {
      node.x = parent.x + k * node.x;
      node.y = parent.y + k * node.y;
    }
  };
}

var roundNode = function(node) {
  node.x0 = Math.round(node.x0);
  node.y0 = Math.round(node.y0);
  node.x1 = Math.round(node.x1);
  node.y1 = Math.round(node.y1);
};

var treemapDice = function(parent, x0, y0, x1, y1) {
  var nodes = parent.children,
      node,
      i = -1,
      n = nodes.length,
      k = parent.value && (x1 - x0) / parent.value;

  while (++i < n) {
    node = nodes[i], node.y0 = y0, node.y1 = y1;
    node.x0 = x0, node.x1 = x0 += node.value * k;
  }
};

var partition = function() {
  var dx = 1,
      dy = 1,
      padding = 0,
      round = false;

  function partition(root) {
    var n = root.height + 1;
    root.x0 =
    root.y0 = padding;
    root.x1 = dx;
    root.y1 = dy / n;
    root.eachBefore(positionNode(dy, n));
    if (round) root.eachBefore(roundNode);
    return root;
  }

  function positionNode(dy, n) {
    return function(node) {
      if (node.children) {
        treemapDice(node, node.x0, dy * (node.depth + 1) / n, node.x1, dy * (node.depth + 2) / n);
      }
      var x0 = node.x0,
          y0 = node.y0,
          x1 = node.x1 - padding,
          y1 = node.y1 - padding;
      if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
      if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
      node.x0 = x0;
      node.y0 = y0;
      node.x1 = x1;
      node.y1 = y1;
    };
  }

  partition.round = function(x) {
    return arguments.length ? (round = !!x, partition) : round;
  };

  partition.size = function(x) {
    return arguments.length ? (dx = +x[0], dy = +x[1], partition) : [dx, dy];
  };

  partition.padding = function(x) {
    return arguments.length ? (padding = +x, partition) : padding;
  };

  return partition;
};

var keyPrefix$1 = "$";
var preroot = {depth: -1};
var ambiguous = {};

function defaultId(d) {
  return d.id;
}

function defaultParentId(d) {
  return d.parentId;
}

var stratify = function() {
  var id = defaultId,
      parentId = defaultParentId;

  function stratify(data) {
    var d,
        i,
        n = data.length,
        root,
        parent,
        node,
        nodes = new Array(n),
        nodeId,
        nodeKey,
        nodeByKey = {};

    for (i = 0; i < n; ++i) {
      d = data[i], node = nodes[i] = new Node(d);
      if ((nodeId = id(d, i, data)) != null && (nodeId += "")) {
        nodeKey = keyPrefix$1 + (node.id = nodeId);
        nodeByKey[nodeKey] = nodeKey in nodeByKey ? ambiguous : node;
      }
    }

    for (i = 0; i < n; ++i) {
      node = nodes[i], nodeId = parentId(data[i], i, data);
      if (nodeId == null || !(nodeId += "")) {
        if (root) throw new Error("multiple roots");
        root = node;
      } else {
        parent = nodeByKey[keyPrefix$1 + nodeId];
        if (!parent) throw new Error("missing: " + nodeId);
        if (parent === ambiguous) throw new Error("ambiguous: " + nodeId);
        if (parent.children) parent.children.push(node);
        else parent.children = [node];
        node.parent = parent;
      }
    }

    if (!root) throw new Error("no root");
    root.parent = preroot;
    root.eachBefore(function(node) { node.depth = node.parent.depth + 1; --n; }).eachBefore(computeHeight);
    root.parent = null;
    if (n > 0) throw new Error("cycle");

    return root;
  }

  stratify.id = function(x) {
    return arguments.length ? (id = required(x), stratify) : id;
  };

  stratify.parentId = function(x) {
    return arguments.length ? (parentId = required(x), stratify) : parentId;
  };

  return stratify;
};

function defaultSeparation$1(a, b) {
  return a.parent === b.parent ? 1 : 2;
}

// function radialSeparation(a, b) {
//   return (a.parent === b.parent ? 1 : 2) / a.depth;
// }

// This function is used to traverse the left contour of a subtree (or
// subforest). It returns the successor of v on this contour. This successor is
// either given by the leftmost child of v or by the thread of v. The function
// returns null if and only if v is on the highest level of its subtree.
function nextLeft(v) {
  var children = v.children;
  return children ? children[0] : v.t;
}

// This function works analogously to nextLeft.
function nextRight(v) {
  var children = v.children;
  return children ? children[children.length - 1] : v.t;
}

// Shifts the current subtree rooted at w+. This is done by increasing
// prelim(w+) and mod(w+) by shift.
function moveSubtree(wm, wp, shift) {
  var change = shift / (wp.i - wm.i);
  wp.c -= change;
  wp.s += shift;
  wm.c += change;
  wp.z += shift;
  wp.m += shift;
}

// All other shifts, applied to the smaller subtrees between w- and w+, are
// performed by this function. To prepare the shifts, we have to adjust
// change(w+), shift(w+), and change(w-).
function executeShifts(v) {
  var shift = 0,
      change = 0,
      children = v.children,
      i = children.length,
      w;
  while (--i >= 0) {
    w = children[i];
    w.z += shift;
    w.m += shift;
    shift += w.s + (change += w.c);
  }
}

// If vi-’s ancestor is a sibling of v, returns vi-’s ancestor. Otherwise,
// returns the specified (default) ancestor.
function nextAncestor(vim, v, ancestor) {
  return vim.a.parent === v.parent ? vim.a : ancestor;
}

function TreeNode(node, i) {
  this._ = node;
  this.parent = null;
  this.children = null;
  this.A = null; // default ancestor
  this.a = this; // ancestor
  this.z = 0; // prelim
  this.m = 0; // mod
  this.c = 0; // change
  this.s = 0; // shift
  this.t = null; // thread
  this.i = i; // number
}

TreeNode.prototype = Object.create(Node.prototype);

function treeRoot(root) {
  var tree = new TreeNode(root, 0),
      node,
      nodes = [tree],
      child,
      children,
      i,
      n;

  while (node = nodes.pop()) {
    if (children = node._.children) {
      node.children = new Array(n = children.length);
      for (i = n - 1; i >= 0; --i) {
        nodes.push(child = node.children[i] = new TreeNode(children[i], i));
        child.parent = node;
      }
    }
  }

  (tree.parent = new TreeNode(null, 0)).children = [tree];
  return tree;
}

// Node-link tree diagram using the Reingold-Tilford "tidy" algorithm
var tree = function() {
  var separation = defaultSeparation$1,
      dx = 1,
      dy = 1,
      nodeSize = null;

  function tree(root) {
    var t = treeRoot(root);

    // Compute the layout using Buchheim et al.’s algorithm.
    t.eachAfter(firstWalk), t.parent.m = -t.z;
    t.eachBefore(secondWalk);

    // If a fixed node size is specified, scale x and y.
    if (nodeSize) root.eachBefore(sizeNode);

    // If a fixed tree size is specified, scale x and y based on the extent.
    // Compute the left-most, right-most, and depth-most nodes for extents.
    else {
      var left = root,
          right = root,
          bottom = root;
      root.eachBefore(function(node) {
        if (node.x < left.x) left = node;
        if (node.x > right.x) right = node;
        if (node.depth > bottom.depth) bottom = node;
      });
      var s = left === right ? 1 : separation(left, right) / 2,
          tx = s - left.x,
          kx = dx / (right.x + s + tx),
          ky = dy / (bottom.depth || 1);
      root.eachBefore(function(node) {
        node.x = (node.x + tx) * kx;
        node.y = node.depth * ky;
      });
    }

    return root;
  }

  // Computes a preliminary x-coordinate for v. Before that, FIRST WALK is
  // applied recursively to the children of v, as well as the function
  // APPORTION. After spacing out the children by calling EXECUTE SHIFTS, the
  // node v is placed to the midpoint of its outermost children.
  function firstWalk(v) {
    var children = v.children,
        siblings = v.parent.children,
        w = v.i ? siblings[v.i - 1] : null;
    if (children) {
      executeShifts(v);
      var midpoint = (children[0].z + children[children.length - 1].z) / 2;
      if (w) {
        v.z = w.z + separation(v._, w._);
        v.m = v.z - midpoint;
      } else {
        v.z = midpoint;
      }
    } else if (w) {
      v.z = w.z + separation(v._, w._);
    }
    v.parent.A = apportion(v, w, v.parent.A || siblings[0]);
  }

  // Computes all real x-coordinates by summing up the modifiers recursively.
  function secondWalk(v) {
    v._.x = v.z + v.parent.m;
    v.m += v.parent.m;
  }

  // The core of the algorithm. Here, a new subtree is combined with the
  // previous subtrees. Threads are used to traverse the inside and outside
  // contours of the left and right subtree up to the highest common level. The
  // vertices used for the traversals are vi+, vi-, vo-, and vo+, where the
  // superscript o means outside and i means inside, the subscript - means left
  // subtree and + means right subtree. For summing up the modifiers along the
  // contour, we use respective variables si+, si-, so-, and so+. Whenever two
  // nodes of the inside contours conflict, we compute the left one of the
  // greatest uncommon ancestors using the function ANCESTOR and call MOVE
  // SUBTREE to shift the subtree and prepare the shifts of smaller subtrees.
  // Finally, we add a new thread (if necessary).
  function apportion(v, w, ancestor) {
    if (w) {
      var vip = v,
          vop = v,
          vim = w,
          vom = vip.parent.children[0],
          sip = vip.m,
          sop = vop.m,
          sim = vim.m,
          som = vom.m,
          shift;
      while (vim = nextRight(vim), vip = nextLeft(vip), vim && vip) {
        vom = nextLeft(vom);
        vop = nextRight(vop);
        vop.a = v;
        shift = vim.z + sim - vip.z - sip + separation(vim._, vip._);
        if (shift > 0) {
          moveSubtree(nextAncestor(vim, v, ancestor), v, shift);
          sip += shift;
          sop += shift;
        }
        sim += vim.m;
        sip += vip.m;
        som += vom.m;
        sop += vop.m;
      }
      if (vim && !nextRight(vop)) {
        vop.t = vim;
        vop.m += sim - sop;
      }
      if (vip && !nextLeft(vom)) {
        vom.t = vip;
        vom.m += sip - som;
        ancestor = v;
      }
    }
    return ancestor;
  }

  function sizeNode(node) {
    node.x *= dx;
    node.y = node.depth * dy;
  }

  tree.separation = function(x) {
    return arguments.length ? (separation = x, tree) : separation;
  };

  tree.size = function(x) {
    return arguments.length ? (nodeSize = false, dx = +x[0], dy = +x[1], tree) : (nodeSize ? null : [dx, dy]);
  };

  tree.nodeSize = function(x) {
    return arguments.length ? (nodeSize = true, dx = +x[0], dy = +x[1], tree) : (nodeSize ? [dx, dy] : null);
  };

  return tree;
};

var treemapSlice = function(parent, x0, y0, x1, y1) {
  var nodes = parent.children,
      node,
      i = -1,
      n = nodes.length,
      k = parent.value && (y1 - y0) / parent.value;

  while (++i < n) {
    node = nodes[i], node.x0 = x0, node.x1 = x1;
    node.y0 = y0, node.y1 = y0 += node.value * k;
  }
};

var phi = (1 + Math.sqrt(5)) / 2;

function squarifyRatio(ratio, parent, x0, y0, x1, y1) {
  var rows = [],
      nodes = parent.children,
      row,
      nodeValue,
      i0 = 0,
      i1 = 0,
      n = nodes.length,
      dx, dy,
      value = parent.value,
      sumValue,
      minValue,
      maxValue,
      newRatio,
      minRatio,
      alpha,
      beta;

  while (i0 < n) {
    dx = x1 - x0, dy = y1 - y0;

    // Find the next non-empty node.
    do sumValue = nodes[i1++].value; while (!sumValue && i1 < n);
    minValue = maxValue = sumValue;
    alpha = Math.max(dy / dx, dx / dy) / (value * ratio);
    beta = sumValue * sumValue * alpha;
    minRatio = Math.max(maxValue / beta, beta / minValue);

    // Keep adding nodes while the aspect ratio maintains or improves.
    for (; i1 < n; ++i1) {
      sumValue += nodeValue = nodes[i1].value;
      if (nodeValue < minValue) minValue = nodeValue;
      if (nodeValue > maxValue) maxValue = nodeValue;
      beta = sumValue * sumValue * alpha;
      newRatio = Math.max(maxValue / beta, beta / minValue);
      if (newRatio > minRatio) { sumValue -= nodeValue; break; }
      minRatio = newRatio;
    }

    // Position and record the row orientation.
    rows.push(row = {value: sumValue, dice: dx < dy, children: nodes.slice(i0, i1)});
    if (row.dice) treemapDice(row, x0, y0, x1, value ? y0 += dy * sumValue / value : y1);
    else treemapSlice(row, x0, y0, value ? x0 += dx * sumValue / value : x1, y1);
    value -= sumValue, i0 = i1;
  }

  return rows;
}

var squarify = ((function custom(ratio) {

  function squarify(parent, x0, y0, x1, y1) {
    squarifyRatio(ratio, parent, x0, y0, x1, y1);
  }

  squarify.ratio = function(x) {
    return custom((x = +x) > 1 ? x : 1);
  };

  return squarify;
}))(phi);

var index$3 = function() {
  var tile = squarify,
      round = false,
      dx = 1,
      dy = 1,
      paddingStack = [0],
      paddingInner = constantZero,
      paddingTop = constantZero,
      paddingRight = constantZero,
      paddingBottom = constantZero,
      paddingLeft = constantZero;

  function treemap(root) {
    root.x0 =
    root.y0 = 0;
    root.x1 = dx;
    root.y1 = dy;
    root.eachBefore(positionNode);
    paddingStack = [0];
    if (round) root.eachBefore(roundNode);
    return root;
  }

  function positionNode(node) {
    var p = paddingStack[node.depth],
        x0 = node.x0 + p,
        y0 = node.y0 + p,
        x1 = node.x1 - p,
        y1 = node.y1 - p;
    if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
    if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
    node.x0 = x0;
    node.y0 = y0;
    node.x1 = x1;
    node.y1 = y1;
    if (node.children) {
      p = paddingStack[node.depth + 1] = paddingInner(node) / 2;
      x0 += paddingLeft(node) - p;
      y0 += paddingTop(node) - p;
      x1 -= paddingRight(node) - p;
      y1 -= paddingBottom(node) - p;
      if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
      if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
      tile(node, x0, y0, x1, y1);
    }
  }

  treemap.round = function(x) {
    return arguments.length ? (round = !!x, treemap) : round;
  };

  treemap.size = function(x) {
    return arguments.length ? (dx = +x[0], dy = +x[1], treemap) : [dx, dy];
  };

  treemap.tile = function(x) {
    return arguments.length ? (tile = required(x), treemap) : tile;
  };

  treemap.padding = function(x) {
    return arguments.length ? treemap.paddingInner(x).paddingOuter(x) : treemap.paddingInner();
  };

  treemap.paddingInner = function(x) {
    return arguments.length ? (paddingInner = typeof x === "function" ? x : constant$9(+x), treemap) : paddingInner;
  };

  treemap.paddingOuter = function(x) {
    return arguments.length ? treemap.paddingTop(x).paddingRight(x).paddingBottom(x).paddingLeft(x) : treemap.paddingTop();
  };

  treemap.paddingTop = function(x) {
    return arguments.length ? (paddingTop = typeof x === "function" ? x : constant$9(+x), treemap) : paddingTop;
  };

  treemap.paddingRight = function(x) {
    return arguments.length ? (paddingRight = typeof x === "function" ? x : constant$9(+x), treemap) : paddingRight;
  };

  treemap.paddingBottom = function(x) {
    return arguments.length ? (paddingBottom = typeof x === "function" ? x : constant$9(+x), treemap) : paddingBottom;
  };

  treemap.paddingLeft = function(x) {
    return arguments.length ? (paddingLeft = typeof x === "function" ? x : constant$9(+x), treemap) : paddingLeft;
  };

  return treemap;
};

var binary = function(parent, x0, y0, x1, y1) {
  var nodes = parent.children,
      i, n = nodes.length,
      sum, sums = new Array(n + 1);

  for (sums[0] = sum = i = 0; i < n; ++i) {
    sums[i + 1] = sum += nodes[i].value;
  }

  partition(0, n, parent.value, x0, y0, x1, y1);

  function partition(i, j, value, x0, y0, x1, y1) {
    if (i >= j - 1) {
      var node = nodes[i];
      node.x0 = x0, node.y0 = y0;
      node.x1 = x1, node.y1 = y1;
      return;
    }

    var valueOffset = sums[i],
        valueTarget = (value / 2) + valueOffset,
        k = i + 1,
        hi = j - 1;

    while (k < hi) {
      var mid = k + hi >>> 1;
      if (sums[mid] < valueTarget) k = mid + 1;
      else hi = mid;
    }

    if ((valueTarget - sums[k - 1]) < (sums[k] - valueTarget) && i + 1 < k) --k;

    var valueLeft = sums[k] - valueOffset,
        valueRight = value - valueLeft;

    if ((x1 - x0) > (y1 - y0)) {
      var xk = (x0 * valueRight + x1 * valueLeft) / value;
      partition(i, k, valueLeft, x0, y0, xk, y1);
      partition(k, j, valueRight, xk, y0, x1, y1);
    } else {
      var yk = (y0 * valueRight + y1 * valueLeft) / value;
      partition(i, k, valueLeft, x0, y0, x1, yk);
      partition(k, j, valueRight, x0, yk, x1, y1);
    }
  }
};

var sliceDice = function(parent, x0, y0, x1, y1) {
  (parent.depth & 1 ? treemapSlice : treemapDice)(parent, x0, y0, x1, y1);
};

var resquarify = ((function custom(ratio) {

  function resquarify(parent, x0, y0, x1, y1) {
    if ((rows = parent._squarify) && (rows.ratio === ratio)) {
      var rows,
          row,
          nodes,
          i,
          j = -1,
          n,
          m = rows.length,
          value = parent.value;

      while (++j < m) {
        row = rows[j], nodes = row.children;
        for (i = row.value = 0, n = nodes.length; i < n; ++i) row.value += nodes[i].value;
        if (row.dice) treemapDice(row, x0, y0, x1, y0 += (y1 - y0) * row.value / value);
        else treemapSlice(row, x0, y0, x0 += (x1 - x0) * row.value / value, y1);
        value -= row.value;
      }
    } else {
      parent._squarify = rows = squarifyRatio(ratio, parent, x0, y0, x1, y1);
      rows.ratio = ratio;
    }
  }

  resquarify.ratio = function(x) {
    return custom((x = +x) > 1 ? x : 1);
  };

  return resquarify;
}))(phi);

var area$1 = function(polygon) {
  var i = -1,
      n = polygon.length,
      a,
      b = polygon[n - 1],
      area = 0;

  while (++i < n) {
    a = b;
    b = polygon[i];
    area += a[1] * b[0] - a[0] * b[1];
  }

  return area / 2;
};

var centroid$1 = function(polygon) {
  var i = -1,
      n = polygon.length,
      x = 0,
      y = 0,
      a,
      b = polygon[n - 1],
      c,
      k = 0;

  while (++i < n) {
    a = b;
    b = polygon[i];
    k += c = a[0] * b[1] - b[0] * a[1];
    x += (a[0] + b[0]) * c;
    y += (a[1] + b[1]) * c;
  }

  return k *= 3, [x / k, y / k];
};

// Returns the 2D cross product of AB and AC vectors, i.e., the z-component of
// the 3D cross product in a quadrant I Cartesian coordinate system (+x is
// right, +y is up). Returns a positive value if ABC is counter-clockwise,
// negative if clockwise, and zero if the points are collinear.
var cross$2 = function(a, b, c) {
  return (b[0] - a[0]) * (c[1] - a[1]) - (b[1] - a[1]) * (c[0] - a[0]);
};

function lexicographicOrder(a, b) {
  return a[0] - b[0] || a[1] - b[1];
}

// Computes the upper convex hull per the monotone chain algorithm.
// Assumes points.length >= 3, is sorted by x, unique in y.
// Returns an array of indices into points in left-to-right order.
function computeUpperHullIndexes(points) {
  var n = points.length,
      indexes = [0, 1],
      size = 2;

  for (var i = 2; i < n; ++i) {
    while (size > 1 && cross$2(points[indexes[size - 2]], points[indexes[size - 1]], points[i]) <= 0) --size;
    indexes[size++] = i;
  }

  return indexes.slice(0, size); // remove popped points
}

var hull = function(points) {
  if ((n = points.length) < 3) return null;

  var i,
      n,
      sortedPoints = new Array(n),
      flippedPoints = new Array(n);

  for (i = 0; i < n; ++i) sortedPoints[i] = [+points[i][0], +points[i][1], i];
  sortedPoints.sort(lexicographicOrder);
  for (i = 0; i < n; ++i) flippedPoints[i] = [sortedPoints[i][0], -sortedPoints[i][1]];

  var upperIndexes = computeUpperHullIndexes(sortedPoints),
      lowerIndexes = computeUpperHullIndexes(flippedPoints);

  // Construct the hull polygon, removing possible duplicate endpoints.
  var skipLeft = lowerIndexes[0] === upperIndexes[0],
      skipRight = lowerIndexes[lowerIndexes.length - 1] === upperIndexes[upperIndexes.length - 1],
      hull = [];

  // Add upper hull in right-to-l order.
  // Then add lower hull in left-to-right order.
  for (i = upperIndexes.length - 1; i >= 0; --i) hull.push(points[sortedPoints[upperIndexes[i]][2]]);
  for (i = +skipLeft; i < lowerIndexes.length - skipRight; ++i) hull.push(points[sortedPoints[lowerIndexes[i]][2]]);

  return hull;
};

var contains$1 = function(polygon, point) {
  var n = polygon.length,
      p = polygon[n - 1],
      x = point[0], y = point[1],
      x0 = p[0], y0 = p[1],
      x1, y1,
      inside = false;

  for (var i = 0; i < n; ++i) {
    p = polygon[i], x1 = p[0], y1 = p[1];
    if (((y1 > y) !== (y0 > y)) && (x < (x0 - x1) * (y - y1) / (y0 - y1) + x1)) inside = !inside;
    x0 = x1, y0 = y1;
  }

  return inside;
};

var length$3 = function(polygon) {
  var i = -1,
      n = polygon.length,
      b = polygon[n - 1],
      xa,
      ya,
      xb = b[0],
      yb = b[1],
      perimeter = 0;

  while (++i < n) {
    xa = xb;
    ya = yb;
    b = polygon[i];
    xb = b[0];
    yb = b[1];
    xa -= xb;
    ya -= yb;
    perimeter += Math.sqrt(xa * xa + ya * ya);
  }

  return perimeter;
};

var slice$5 = [].slice;

var noabort = {};

function Queue(size) {
  this._size = size;
  this._call =
  this._error = null;
  this._tasks = [];
  this._data = [];
  this._waiting =
  this._active =
  this._ended =
  this._start = 0; // inside a synchronous task callback?
}

Queue.prototype = queue.prototype = {
  constructor: Queue,
  defer: function(callback) {
    if (typeof callback !== "function") throw new Error("invalid callback");
    if (this._call) throw new Error("defer after await");
    if (this._error != null) return this;
    var t = slice$5.call(arguments, 1);
    t.push(callback);
    ++this._waiting, this._tasks.push(t);
    poke$1(this);
    return this;
  },
  abort: function() {
    if (this._error == null) abort(this, new Error("abort"));
    return this;
  },
  await: function(callback) {
    if (typeof callback !== "function") throw new Error("invalid callback");
    if (this._call) throw new Error("multiple await");
    this._call = function(error, results) { callback.apply(null, [error].concat(results)); };
    maybeNotify(this);
    return this;
  },
  awaitAll: function(callback) {
    if (typeof callback !== "function") throw new Error("invalid callback");
    if (this._call) throw new Error("multiple await");
    this._call = callback;
    maybeNotify(this);
    return this;
  }
};

function poke$1(q) {
  if (!q._start) {
    try { start$1(q); } // let the current task complete
    catch (e) {
      if (q._tasks[q._ended + q._active - 1]) abort(q, e); // task errored synchronously
      else if (!q._data) throw e; // await callback errored synchronously
    }
  }
}

function start$1(q) {
  while (q._start = q._waiting && q._active < q._size) {
    var i = q._ended + q._active,
        t = q._tasks[i],
        j = t.length - 1,
        c = t[j];
    t[j] = end(q, i);
    --q._waiting, ++q._active;
    t = c.apply(null, t);
    if (!q._tasks[i]) continue; // task finished synchronously
    q._tasks[i] = t || noabort;
  }
}

function end(q, i) {
  return function(e, r) {
    if (!q._tasks[i]) return; // ignore multiple callbacks
    --q._active, ++q._ended;
    q._tasks[i] = null;
    if (q._error != null) return; // ignore secondary errors
    if (e != null) {
      abort(q, e);
    } else {
      q._data[i] = r;
      if (q._waiting) poke$1(q);
      else maybeNotify(q);
    }
  };
}

function abort(q, e) {
  var i = q._tasks.length, t;
  q._error = e; // ignore active callbacks
  q._data = undefined; // allow gc
  q._waiting = NaN; // prevent starting

  while (--i >= 0) {
    if (t = q._tasks[i]) {
      q._tasks[i] = null;
      if (t.abort) {
        try { t.abort(); }
        catch (e) { /* ignore */ }
      }
    }
  }

  q._active = NaN; // allow notification
  maybeNotify(q);
}

function maybeNotify(q) {
  if (!q._active && q._call) {
    var d = q._data;
    q._data = undefined; // allow gc
    q._call(q._error, d);
  }
}

function queue(concurrency) {
  if (concurrency == null) concurrency = Infinity;
  else if (!((concurrency = +concurrency) >= 1)) throw new Error("invalid concurrency");
  return new Queue(concurrency);
}

var defaultSource$1 = function() {
  return Math.random();
};

var uniform = ((function sourceRandomUniform(source) {
  function randomUniform(min, max) {
    min = min == null ? 0 : +min;
    max = max == null ? 1 : +max;
    if (arguments.length === 1) max = min, min = 0;
    else max -= min;
    return function() {
      return source() * max + min;
    };
  }

  randomUniform.source = sourceRandomUniform;

  return randomUniform;
}))(defaultSource$1);

var normal = ((function sourceRandomNormal(source) {
  function randomNormal(mu, sigma) {
    var x, r;
    mu = mu == null ? 0 : +mu;
    sigma = sigma == null ? 1 : +sigma;
    return function() {
      var y;

      // If available, use the second previously-generated uniform random.
      if (x != null) y = x, x = null;

      // Otherwise, generate a new x and y.
      else do {
        x = source() * 2 - 1;
        y = source() * 2 - 1;
        r = x * x + y * y;
      } while (!r || r > 1);

      return mu + sigma * y * Math.sqrt(-2 * Math.log(r) / r);
    };
  }

  randomNormal.source = sourceRandomNormal;

  return randomNormal;
}))(defaultSource$1);

var logNormal = ((function sourceRandomLogNormal(source) {
  function randomLogNormal() {
    var randomNormal = normal.source(source).apply(this, arguments);
    return function() {
      return Math.exp(randomNormal());
    };
  }

  randomLogNormal.source = sourceRandomLogNormal;

  return randomLogNormal;
}))(defaultSource$1);

var irwinHall = ((function sourceRandomIrwinHall(source) {
  function randomIrwinHall(n) {
    return function() {
      for (var sum = 0, i = 0; i < n; ++i) sum += source();
      return sum;
    };
  }

  randomIrwinHall.source = sourceRandomIrwinHall;

  return randomIrwinHall;
}))(defaultSource$1);

var bates = ((function sourceRandomBates(source) {
  function randomBates(n) {
    var randomIrwinHall = irwinHall.source(source)(n);
    return function() {
      return randomIrwinHall() / n;
    };
  }

  randomBates.source = sourceRandomBates;

  return randomBates;
}))(defaultSource$1);

var exponential$1 = ((function sourceRandomExponential(source) {
  function randomExponential(lambda) {
    return function() {
      return -Math.log(1 - source()) / lambda;
    };
  }

  randomExponential.source = sourceRandomExponential;

  return randomExponential;
}))(defaultSource$1);

var request = function(url, callback) {
  var request,
      event = dispatch("beforesend", "progress", "load", "error"),
      mimeType,
      headers = map$2(),
      xhr = new XMLHttpRequest,
      user = null,
      password = null,
      response,
      responseType,
      timeout = 0;

  // If IE does not support CORS, use XDomainRequest.
  if (typeof XDomainRequest !== "undefined"
      && !("withCredentials" in xhr)
      && /^(http(s)?:)?\/\//.test(url)) xhr = new XDomainRequest;

  "onload" in xhr
      ? xhr.onload = xhr.onerror = xhr.ontimeout = respond
      : xhr.onreadystatechange = function(o) { xhr.readyState > 3 && respond(o); };

  function respond(o) {
    var status = xhr.status, result;
    if (!status && hasResponse(xhr)
        || status >= 200 && status < 300
        || status === 304) {
      if (response) {
        try {
          result = response.call(request, xhr);
        } catch (e) {
          event.call("error", request, e);
          return;
        }
      } else {
        result = xhr;
      }
      event.call("load", request, result);
    } else {
      event.call("error", request, o);
    }
  }

  xhr.onprogress = function(e) {
    event.call("progress", request, e);
  };

  request = {
    header: function(name, value) {
      name = (name + "").toLowerCase();
      if (arguments.length < 2) return headers.get(name);
      if (value == null) headers.remove(name);
      else headers.set(name, value + "");
      return request;
    },

    // If mimeType is non-null and no Accept header is set, a default is used.
    mimeType: function(value) {
      if (!arguments.length) return mimeType;
      mimeType = value == null ? null : value + "";
      return request;
    },

    // Specifies what type the response value should take;
    // for instance, arraybuffer, blob, document, or text.
    responseType: function(value) {
      if (!arguments.length) return responseType;
      responseType = value;
      return request;
    },

    timeout: function(value) {
      if (!arguments.length) return timeout;
      timeout = +value;
      return request;
    },

    user: function(value) {
      return arguments.length < 1 ? user : (user = value == null ? null : value + "", request);
    },

    password: function(value) {
      return arguments.length < 1 ? password : (password = value == null ? null : value + "", request);
    },

    // Specify how to convert the response content to a specific type;
    // changes the callback value on "load" events.
    response: function(value) {
      response = value;
      return request;
    },

    // Alias for send("GET", …).
    get: function(data, callback) {
      return request.send("GET", data, callback);
    },

    // Alias for send("POST", …).
    post: function(data, callback) {
      return request.send("POST", data, callback);
    },

    // If callback is non-null, it will be used for error and load events.
    send: function(method, data, callback) {
      xhr.open(method, url, true, user, password);
      if (mimeType != null && !headers.has("accept")) headers.set("accept", mimeType + ",*/*");
      if (xhr.setRequestHeader) headers.each(function(value, name) { xhr.setRequestHeader(name, value); });
      if (mimeType != null && xhr.overrideMimeType) xhr.overrideMimeType(mimeType);
      if (responseType != null) xhr.responseType = responseType;
      if (timeout > 0) xhr.timeout = timeout;
      if (callback == null && typeof data === "function") callback = data, data = null;
      if (callback != null && callback.length === 1) callback = fixCallback(callback);
      if (callback != null) request.on("error", callback).on("load", function(xhr) { callback(null, xhr); });
      event.call("beforesend", request, xhr);
      xhr.send(data == null ? null : data);
      return request;
    },

    abort: function() {
      xhr.abort();
      return request;
    },

    on: function() {
      var value = event.on.apply(event, arguments);
      return value === event ? request : value;
    }
  };

  if (callback != null) {
    if (typeof callback !== "function") throw new Error("invalid callback: " + callback);
    return request.get(callback);
  }

  return request;
};

function fixCallback(callback) {
  return function(error, xhr) {
    callback(error == null ? xhr : null);
  };
}

function hasResponse(xhr) {
  var type = xhr.responseType;
  return type && type !== "text"
      ? xhr.response // null on error
      : xhr.responseText; // "" on error
}

var type$1 = function(defaultMimeType, response) {
  return function(url, callback) {
    var r = request(url).mimeType(defaultMimeType).response(response);
    if (callback != null) {
      if (typeof callback !== "function") throw new Error("invalid callback: " + callback);
      return r.get(callback);
    }
    return r;
  };
};

var html = type$1("text/html", function(xhr) {
  return document.createRange().createContextualFragment(xhr.responseText);
});

var json = type$1("application/json", function(xhr) {
  return JSON.parse(xhr.responseText);
});

var text = type$1("text/plain", function(xhr) {
  return xhr.responseText;
});

var xml = type$1("application/xml", function(xhr) {
  var xml = xhr.responseXML;
  if (!xml) throw new Error("parse error");
  return xml;
});

var dsv$1 = function(defaultMimeType, parse) {
  return function(url, row, callback) {
    if (arguments.length < 3) callback = row, row = null;
    var r = request(url).mimeType(defaultMimeType);
    r.row = function(_) { return arguments.length ? r.response(responseOf(parse, row = _)) : row; };
    r.row(row);
    return callback ? r.get(callback) : r;
  };
};

function responseOf(parse, row) {
  return function(request$$1) {
    return parse(request$$1.responseText, row);
  };
}

var csv$1 = dsv$1("text/csv", csvParse);

var tsv$1 = dsv$1("text/tab-separated-values", tsvParse);

var array$3 = Array.prototype;

var map$4 = array$3.map;
var slice$6 = array$3.slice;

var implicit = {name: "implicit"};

function ordinal(range) {
  var index = map$2(),
      domain = [],
      unknown = implicit;

  range = range == null ? [] : slice$6.call(range);

  function scale(d) {
    var key = d + "", i = index.get(key);
    if (!i) {
      if (unknown !== implicit) return unknown;
      index.set(key, i = domain.push(d));
    }
    return range[(i - 1) % range.length];
  }

  scale.domain = function(_) {
    if (!arguments.length) return domain.slice();
    domain = [], index = map$2();
    var i = -1, n = _.length, d, key;
    while (++i < n) if (!index.has(key = (d = _[i]) + "")) index.set(key, domain.push(d));
    return scale;
  };

  scale.range = function(_) {
    return arguments.length ? (range = slice$6.call(_), scale) : range.slice();
  };

  scale.unknown = function(_) {
    return arguments.length ? (unknown = _, scale) : unknown;
  };

  scale.copy = function() {
    return ordinal()
        .domain(domain)
        .range(range)
        .unknown(unknown);
  };

  return scale;
}

function band() {
  var scale = ordinal().unknown(undefined),
      domain = scale.domain,
      ordinalRange = scale.range,
      range$$1 = [0, 1],
      step,
      bandwidth,
      round = false,
      paddingInner = 0,
      paddingOuter = 0,
      align = 0.5;

  delete scale.unknown;

  function rescale() {
    var n = domain().length,
        reverse = range$$1[1] < range$$1[0],
        start = range$$1[reverse - 0],
        stop = range$$1[1 - reverse];
    step = (stop - start) / Math.max(1, n - paddingInner + paddingOuter * 2);
    if (round) step = Math.floor(step);
    start += (stop - start - step * (n - paddingInner)) * align;
    bandwidth = step * (1 - paddingInner);
    if (round) start = Math.round(start), bandwidth = Math.round(bandwidth);
    var values = sequence(n).map(function(i) { return start + step * i; });
    return ordinalRange(reverse ? values.reverse() : values);
  }

  scale.domain = function(_) {
    return arguments.length ? (domain(_), rescale()) : domain();
  };

  scale.range = function(_) {
    return arguments.length ? (range$$1 = [+_[0], +_[1]], rescale()) : range$$1.slice();
  };

  scale.rangeRound = function(_) {
    return range$$1 = [+_[0], +_[1]], round = true, rescale();
  };

  scale.bandwidth = function() {
    return bandwidth;
  };

  scale.step = function() {
    return step;
  };

  scale.round = function(_) {
    return arguments.length ? (round = !!_, rescale()) : round;
  };

  scale.padding = function(_) {
    return arguments.length ? (paddingInner = paddingOuter = Math.max(0, Math.min(1, _)), rescale()) : paddingInner;
  };

  scale.paddingInner = function(_) {
    return arguments.length ? (paddingInner = Math.max(0, Math.min(1, _)), rescale()) : paddingInner;
  };

  scale.paddingOuter = function(_) {
    return arguments.length ? (paddingOuter = Math.max(0, Math.min(1, _)), rescale()) : paddingOuter;
  };

  scale.align = function(_) {
    return arguments.length ? (align = Math.max(0, Math.min(1, _)), rescale()) : align;
  };

  scale.copy = function() {
    return band()
        .domain(domain())
        .range(range$$1)
        .round(round)
        .paddingInner(paddingInner)
        .paddingOuter(paddingOuter)
        .align(align);
  };

  return rescale();
}

function pointish(scale) {
  var copy = scale.copy;

  scale.padding = scale.paddingOuter;
  delete scale.paddingInner;
  delete scale.paddingOuter;

  scale.copy = function() {
    return pointish(copy());
  };

  return scale;
}

function point$1() {
  return pointish(band().paddingInner(1));
}

var constant$10 = function(x) {
  return function() {
    return x;
  };
};

var number$3 = function(x) {
  return +x;
};

var unit = [0, 1];

function deinterpolateLinear(a, b) {
  return (b -= (a = +a))
      ? function(x) { return (x - a) / b; }
      : constant$10(b);
}

function deinterpolateClamp(deinterpolate) {
  return function(a, b) {
    var d = deinterpolate(a = +a, b = +b);
    return function(x) { return x <= a ? 0 : x >= b ? 1 : d(x); };
  };
}

function reinterpolateClamp(reinterpolate) {
  return function(a, b) {
    var r = reinterpolate(a = +a, b = +b);
    return function(t) { return t <= 0 ? a : t >= 1 ? b : r(t); };
  };
}

function bimap(domain, range$$1, deinterpolate, reinterpolate) {
  var d0 = domain[0], d1 = domain[1], r0 = range$$1[0], r1 = range$$1[1];
  if (d1 < d0) d0 = deinterpolate(d1, d0), r0 = reinterpolate(r1, r0);
  else d0 = deinterpolate(d0, d1), r0 = reinterpolate(r0, r1);
  return function(x) { return r0(d0(x)); };
}

function polymap(domain, range$$1, deinterpolate, reinterpolate) {
  var j = Math.min(domain.length, range$$1.length) - 1,
      d = new Array(j),
      r = new Array(j),
      i = -1;

  // Reverse descending domains.
  if (domain[j] < domain[0]) {
    domain = domain.slice().reverse();
    range$$1 = range$$1.slice().reverse();
  }

  while (++i < j) {
    d[i] = deinterpolate(domain[i], domain[i + 1]);
    r[i] = reinterpolate(range$$1[i], range$$1[i + 1]);
  }

  return function(x) {
    var i = bisectRight$1(domain, x, 1, j) - 1;
    return r[i](d[i](x));
  };
}

function copy(source, target) {
  return target
      .domain(source.domain())
      .range(source.range())
      .interpolate(source.interpolate())
      .clamp(source.clamp());
}

// deinterpolate(a, b)(x) takes a domain value x in [a,b] and returns the corresponding parameter t in [0,1].
// reinterpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding domain value x in [a,b].
function continuous(deinterpolate, reinterpolate) {
  var domain = unit,
      range$$1 = unit,
      interpolate$$1 = interpolateValue,
      clamp = false,
      piecewise,
      output,
      input;

  function rescale() {
    piecewise = Math.min(domain.length, range$$1.length) > 2 ? polymap : bimap;
    output = input = null;
    return scale;
  }

  function scale(x) {
    return (output || (output = piecewise(domain, range$$1, clamp ? deinterpolateClamp(deinterpolate) : deinterpolate, interpolate$$1)))(+x);
  }

  scale.invert = function(y) {
    return (input || (input = piecewise(range$$1, domain, deinterpolateLinear, clamp ? reinterpolateClamp(reinterpolate) : reinterpolate)))(+y);
  };

  scale.domain = function(_) {
    return arguments.length ? (domain = map$4.call(_, number$3), rescale()) : domain.slice();
  };

  scale.range = function(_) {
    return arguments.length ? (range$$1 = slice$6.call(_), rescale()) : range$$1.slice();
  };

  scale.rangeRound = function(_) {
    return range$$1 = slice$6.call(_), interpolate$$1 = interpolateRound, rescale();
  };

  scale.clamp = function(_) {
    return arguments.length ? (clamp = !!_, rescale()) : clamp;
  };

  scale.interpolate = function(_) {
    return arguments.length ? (interpolate$$1 = _, rescale()) : interpolate$$1;
  };

  return rescale();
}

var tickFormat = function(domain, count, specifier) {
  var start = domain[0],
      stop = domain[domain.length - 1],
      step = tickStep$1(start, stop, count == null ? 10 : count),
      precision;
  specifier = formatSpecifier(specifier == null ? ",f" : specifier);
  switch (specifier.type) {
    case "s": {
      var value = Math.max(Math.abs(start), Math.abs(stop));
      if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;
      return exports.formatPrefix(specifier, value);
    }
    case "":
    case "e":
    case "g":
    case "p":
    case "r": {
      if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === "e");
      break;
    }
    case "f":
    case "%": {
      if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === "%") * 2;
      break;
    }
  }
  return exports.format(specifier);
};

function linearish(scale) {
  var domain = scale.domain;

  scale.ticks = function(count) {
    var d = domain();
    return ticks$1(d[0], d[d.length - 1], count == null ? 10 : count);
  };

  scale.tickFormat = function(count, specifier) {
    return tickFormat(domain(), count, specifier);
  };

  scale.nice = function(count) {
    if (count == null) count = 10;

    var d = domain(),
        i0 = 0,
        i1 = d.length - 1,
        start = d[i0],
        stop = d[i1],
        step;

    if (stop < start) {
      step = start, start = stop, stop = step;
      step = i0, i0 = i1, i1 = step;
    }

    step = tickIncrement$1(start, stop, count);

    if (step > 0) {
      start = Math.floor(start / step) * step;
      stop = Math.ceil(stop / step) * step;
      step = tickIncrement$1(start, stop, count);
    } else if (step < 0) {
      start = Math.ceil(start * step) / step;
      stop = Math.floor(stop * step) / step;
      step = tickIncrement$1(start, stop, count);
    }

    if (step > 0) {
      d[i0] = Math.floor(start / step) * step;
      d[i1] = Math.ceil(stop / step) * step;
      domain(d);
    } else if (step < 0) {
      d[i0] = Math.ceil(start * step) / step;
      d[i1] = Math.floor(stop * step) / step;
      domain(d);
    }

    return scale;
  };

  return scale;
}

function linear$2() {
  var scale = continuous(deinterpolateLinear, reinterpolate);

  scale.copy = function() {
    return copy(scale, linear$2());
  };

  return linearish(scale);
}

function identity$7() {
  var domain = [0, 1];

  function scale(x) {
    return +x;
  }

  scale.invert = scale;

  scale.domain = scale.range = function(_) {
    return arguments.length ? (domain = map$4.call(_, number$3), scale) : domain.slice();
  };

  scale.copy = function() {
    return identity$7().domain(domain);
  };

  return linearish(scale);
}

var nice = function(domain, interval) {
  domain = domain.slice();

  var i0 = 0,
      i1 = domain.length - 1,
      x0 = domain[i0],
      x1 = domain[i1],
      t;

  if (x1 < x0) {
    t = i0, i0 = i1, i1 = t;
    t = x0, x0 = x1, x1 = t;
  }

  domain[i0] = interval.floor(x0);
  domain[i1] = interval.ceil(x1);
  return domain;
};

function deinterpolate(a, b) {
  return (b = Math.log(b / a))
      ? function(x) { return Math.log(x / a) / b; }
      : constant$10(b);
}

function reinterpolate$1(a, b) {
  return a < 0
      ? function(t) { return -Math.pow(-b, t) * Math.pow(-a, 1 - t); }
      : function(t) { return Math.pow(b, t) * Math.pow(a, 1 - t); };
}

function pow10(x) {
  return isFinite(x) ? +("1e" + x) : x < 0 ? 0 : x;
}

function powp(base) {
  return base === 10 ? pow10
      : base === Math.E ? Math.exp
      : function(x) { return Math.pow(base, x); };
}

function logp(base) {
  return base === Math.E ? Math.log
      : base === 10 && Math.log10
      || base === 2 && Math.log2
      || (base = Math.log(base), function(x) { return Math.log(x) / base; });
}

function reflect(f) {
  return function(x) {
    return -f(-x);
  };
}

function log$1() {
  var scale = continuous(deinterpolate, reinterpolate$1).domain([1, 10]),
      domain = scale.domain,
      base = 10,
      logs = logp(10),
      pows = powp(10);

  function rescale() {
    logs = logp(base), pows = powp(base);
    if (domain()[0] < 0) logs = reflect(logs), pows = reflect(pows);
    return scale;
  }

  scale.base = function(_) {
    return arguments.length ? (base = +_, rescale()) : base;
  };

  scale.domain = function(_) {
    return arguments.length ? (domain(_), rescale()) : domain();
  };

  scale.ticks = function(count) {
    var d = domain(),
        u = d[0],
        v = d[d.length - 1],
        r;

    if (r = v < u) i = u, u = v, v = i;

    var i = logs(u),
        j = logs(v),
        p,
        k,
        t,
        n = count == null ? 10 : +count,
        z = [];

    if (!(base % 1) && j - i < n) {
      i = Math.round(i) - 1, j = Math.round(j) + 1;
      if (u > 0) for (; i < j; ++i) {
        for (k = 1, p = pows(i); k < base; ++k) {
          t = p * k;
          if (t < u) continue;
          if (t > v) break;
          z.push(t);
        }
      } else for (; i < j; ++i) {
        for (k = base - 1, p = pows(i); k >= 1; --k) {
          t = p * k;
          if (t < u) continue;
          if (t > v) break;
          z.push(t);
        }
      }
    } else {
      z = ticks$1(i, j, Math.min(j - i, n)).map(pows);
    }

    return r ? z.reverse() : z;
  };

  scale.tickFormat = function(count, specifier) {
    if (specifier == null) specifier = base === 10 ? ".0e" : ",";
    if (typeof specifier !== "function") specifier = exports.format(specifier);
    if (count === Infinity) return specifier;
    if (count == null) count = 10;
    var k = Math.max(1, base * count / scale.ticks().length); // TODO fast estimate?
    return function(d) {
      var i = d / pows(Math.round(logs(d)));
      if (i * base < base - 0.5) i *= base;
      return i <= k ? specifier(d) : "";
    };
  };

  scale.nice = function() {
    return domain(nice(domain(), {
      floor: function(x) { return pows(Math.floor(logs(x))); },
      ceil: function(x) { return pows(Math.ceil(logs(x))); }
    }));
  };

  scale.copy = function() {
    return copy(scale, log$1().base(base));
  };

  return scale;
}

function raise$1(x, exponent) {
  return x < 0 ? -Math.pow(-x, exponent) : Math.pow(x, exponent);
}

function pow$1() {
  var exponent = 1,
      scale = continuous(deinterpolate, reinterpolate),
      domain = scale.domain;

  function deinterpolate(a, b) {
    return (b = raise$1(b, exponent) - (a = raise$1(a, exponent)))
        ? function(x) { return (raise$1(x, exponent) - a) / b; }
        : constant$10(b);
  }

  function reinterpolate(a, b) {
    b = raise$1(b, exponent) - (a = raise$1(a, exponent));
    return function(t) { return raise$1(a + b * t, 1 / exponent); };
  }

  scale.exponent = function(_) {
    return arguments.length ? (exponent = +_, domain(domain())) : exponent;
  };

  scale.copy = function() {
    return copy(scale, pow$1().exponent(exponent));
  };

  return linearish(scale);
}

function sqrt$1() {
  return pow$1().exponent(0.5);
}

function quantile$1() {
  var domain = [],
      range$$1 = [],
      thresholds = [];

  function rescale() {
    var i = 0, n = Math.max(1, range$$1.length);
    thresholds = new Array(n - 1);
    while (++i < n) thresholds[i - 1] = threshold(domain, i / n);
    return scale;
  }

  function scale(x) {
    if (!isNaN(x = +x)) return range$$1[bisectRight$1(thresholds, x)];
  }

  scale.invertExtent = function(y) {
    var i = range$$1.indexOf(y);
    return i < 0 ? [NaN, NaN] : [
      i > 0 ? thresholds[i - 1] : domain[0],
      i < thresholds.length ? thresholds[i] : domain[domain.length - 1]
    ];
  };

  scale.domain = function(_) {
    if (!arguments.length) return domain.slice();
    domain = [];
    for (var i = 0, n = _.length, d; i < n; ++i) if (d = _[i], d != null && !isNaN(d = +d)) domain.push(d);
    domain.sort(ascending$2);
    return rescale();
  };

  scale.range = function(_) {
    return arguments.length ? (range$$1 = slice$6.call(_), rescale()) : range$$1.slice();
  };

  scale.quantiles = function() {
    return thresholds.slice();
  };

  scale.copy = function() {
    return quantile$1()
        .domain(domain)
        .range(range$$1);
  };

  return scale;
}

function quantize$1() {
  var x0 = 0,
      x1 = 1,
      n = 1,
      domain = [0.5],
      range$$1 = [0, 1];

  function scale(x) {
    if (x <= x) return range$$1[bisectRight$1(domain, x, 0, n)];
  }

  function rescale() {
    var i = -1;
    domain = new Array(n);
    while (++i < n) domain[i] = ((i + 1) * x1 - (i - n) * x0) / (n + 1);
    return scale;
  }

  scale.domain = function(_) {
    return arguments.length ? (x0 = +_[0], x1 = +_[1], rescale()) : [x0, x1];
  };

  scale.range = function(_) {
    return arguments.length ? (n = (range$$1 = slice$6.call(_)).length - 1, rescale()) : range$$1.slice();
  };

  scale.invertExtent = function(y) {
    var i = range$$1.indexOf(y);
    return i < 0 ? [NaN, NaN]
        : i < 1 ? [x0, domain[0]]
        : i >= n ? [domain[n - 1], x1]
        : [domain[i - 1], domain[i]];
  };

  scale.copy = function() {
    return quantize$1()
        .domain([x0, x1])
        .range(range$$1);
  };

  return linearish(scale);
}

function threshold$1() {
  var domain = [0.5],
      range$$1 = [0, 1],
      n = 1;

  function scale(x) {
    if (x <= x) return range$$1[bisectRight$1(domain, x, 0, n)];
  }

  scale.domain = function(_) {
    return arguments.length ? (domain = slice$6.call(_), n = Math.min(domain.length, range$$1.length - 1), scale) : domain.slice();
  };

  scale.range = function(_) {
    return arguments.length ? (range$$1 = slice$6.call(_), n = Math.min(domain.length, range$$1.length - 1), scale) : range$$1.slice();
  };

  scale.invertExtent = function(y) {
    var i = range$$1.indexOf(y);
    return [domain[i - 1], domain[i]];
  };

  scale.copy = function() {
    return threshold$1()
        .domain(domain)
        .range(range$$1);
  };

  return scale;
}

var t0$1 = new Date;
var t1$1 = new Date;

function newInterval(floori, offseti, count, field) {

  function interval(date) {
    return floori(date = new Date(+date)), date;
  }

  interval.floor = interval;

  interval.ceil = function(date) {
    return floori(date = new Date(date - 1)), offseti(date, 1), floori(date), date;
  };

  interval.round = function(date) {
    var d0 = interval(date),
        d1 = interval.ceil(date);
    return date - d0 < d1 - date ? d0 : d1;
  };

  interval.offset = function(date, step) {
    return offseti(date = new Date(+date), step == null ? 1 : Math.floor(step)), date;
  };

  interval.range = function(start, stop, step) {
    var range = [];
    start = interval.ceil(start);
    step = step == null ? 1 : Math.floor(step);
    if (!(start < stop) || !(step > 0)) return range; // also handles Invalid Date
    do range.push(new Date(+start)); while (offseti(start, step), floori(start), start < stop)
    return range;
  };

  interval.filter = function(test) {
    return newInterval(function(date) {
      if (date >= date) while (floori(date), !test(date)) date.setTime(date - 1);
    }, function(date, step) {
      if (date >= date) {
        if (step < 0) while (++step <= 0) {
          while (offseti(date, -1), !test(date)) {} // eslint-disable-line no-empty
        } else while (--step >= 0) {
          while (offseti(date, +1), !test(date)) {} // eslint-disable-line no-empty
        }
      }
    });
  };

  if (count) {
    interval.count = function(start, end) {
      t0$1.setTime(+start), t1$1.setTime(+end);
      floori(t0$1), floori(t1$1);
      return Math.floor(count(t0$1, t1$1));
    };

    interval.every = function(step) {
      step = Math.floor(step);
      return !isFinite(step) || !(step > 0) ? null
          : !(step > 1) ? interval
          : interval.filter(field
              ? function(d) { return field(d) % step === 0; }
              : function(d) { return interval.count(0, d) % step === 0; });
    };
  }

  return interval;
}

var millisecond = newInterval(function() {
  // noop
}, function(date, step) {
  date.setTime(+date + step);
}, function(start, end) {
  return end - start;
});

// An optimized implementation for this simple case.
millisecond.every = function(k) {
  k = Math.floor(k);
  if (!isFinite(k) || !(k > 0)) return null;
  if (!(k > 1)) return millisecond;
  return newInterval(function(date) {
    date.setTime(Math.floor(date / k) * k);
  }, function(date, step) {
    date.setTime(+date + step * k);
  }, function(start, end) {
    return (end - start) / k;
  });
};

var milliseconds = millisecond.range;

var durationSecond$1 = 1e3;
var durationMinute$1 = 6e4;
var durationHour$1 = 36e5;
var durationDay$1 = 864e5;
var durationWeek$1 = 6048e5;

var second = newInterval(function(date) {
  date.setTime(Math.floor(date / durationSecond$1) * durationSecond$1);
}, function(date, step) {
  date.setTime(+date + step * durationSecond$1);
}, function(start, end) {
  return (end - start) / durationSecond$1;
}, function(date) {
  return date.getUTCSeconds();
});

var seconds = second.range;

var minute = newInterval(function(date) {
  date.setTime(Math.floor(date / durationMinute$1) * durationMinute$1);
}, function(date, step) {
  date.setTime(+date + step * durationMinute$1);
}, function(start, end) {
  return (end - start) / durationMinute$1;
}, function(date) {
  return date.getMinutes();
});

var minutes = minute.range;

var hour = newInterval(function(date) {
  var offset = date.getTimezoneOffset() * durationMinute$1 % durationHour$1;
  if (offset < 0) offset += durationHour$1;
  date.setTime(Math.floor((+date - offset) / durationHour$1) * durationHour$1 + offset);
}, function(date, step) {
  date.setTime(+date + step * durationHour$1);
}, function(start, end) {
  return (end - start) / durationHour$1;
}, function(date) {
  return date.getHours();
});

var hours = hour.range;

var day = newInterval(function(date) {
  date.setHours(0, 0, 0, 0);
}, function(date, step) {
  date.setDate(date.getDate() + step);
}, function(start, end) {
  return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute$1) / durationDay$1;
}, function(date) {
  return date.getDate() - 1;
});

var days = day.range;

function weekday(i) {
  return newInterval(function(date) {
    date.setDate(date.getDate() - (date.getDay() + 7 - i) % 7);
    date.setHours(0, 0, 0, 0);
  }, function(date, step) {
    date.setDate(date.getDate() + step * 7);
  }, function(start, end) {
    return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute$1) / durationWeek$1;
  });
}

var sunday = weekday(0);
var monday = weekday(1);
var tuesday = weekday(2);
var wednesday = weekday(3);
var thursday = weekday(4);
var friday = weekday(5);
var saturday = weekday(6);

var sundays = sunday.range;
var mondays = monday.range;
var tuesdays = tuesday.range;
var wednesdays = wednesday.range;
var thursdays = thursday.range;
var fridays = friday.range;
var saturdays = saturday.range;

var month = newInterval(function(date) {
  date.setDate(1);
  date.setHours(0, 0, 0, 0);
}, function(date, step) {
  date.setMonth(date.getMonth() + step);
}, function(start, end) {
  return end.getMonth() - start.getMonth() + (end.getFullYear() - start.getFullYear()) * 12;
}, function(date) {
  return date.getMonth();
});

var months = month.range;

var year = newInterval(function(date) {
  date.setMonth(0, 1);
  date.setHours(0, 0, 0, 0);
}, function(date, step) {
  date.setFullYear(date.getFullYear() + step);
}, function(start, end) {
  return end.getFullYear() - start.getFullYear();
}, function(date) {
  return date.getFullYear();
});

// An optimized implementation for this simple case.
year.every = function(k) {
  return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function(date) {
    date.setFullYear(Math.floor(date.getFullYear() / k) * k);
    date.setMonth(0, 1);
    date.setHours(0, 0, 0, 0);
  }, function(date, step) {
    date.setFullYear(date.getFullYear() + step * k);
  });
};

var years = year.range;

var utcMinute = newInterval(function(date) {
  date.setUTCSeconds(0, 0);
}, function(date, step) {
  date.setTime(+date + step * durationMinute$1);
}, function(start, end) {
  return (end - start) / durationMinute$1;
}, function(date) {
  return date.getUTCMinutes();
});

var utcMinutes = utcMinute.range;

var utcHour = newInterval(function(date) {
  date.setUTCMinutes(0, 0, 0);
}, function(date, step) {
  date.setTime(+date + step * durationHour$1);
}, function(start, end) {
  return (end - start) / durationHour$1;
}, function(date) {
  return date.getUTCHours();
});

var utcHours = utcHour.range;

var utcDay = newInterval(function(date) {
  date.setUTCHours(0, 0, 0, 0);
}, function(date, step) {
  date.setUTCDate(date.getUTCDate() + step);
}, function(start, end) {
  return (end - start) / durationDay$1;
}, function(date) {
  return date.getUTCDate() - 1;
});

var utcDays = utcDay.range;

function utcWeekday(i) {
  return newInterval(function(date) {
    date.setUTCDate(date.getUTCDate() - (date.getUTCDay() + 7 - i) % 7);
    date.setUTCHours(0, 0, 0, 0);
  }, function(date, step) {
    date.setUTCDate(date.getUTCDate() + step * 7);
  }, function(start, end) {
    return (end - start) / durationWeek$1;
  });
}

var utcSunday = utcWeekday(0);
var utcMonday = utcWeekday(1);
var utcTuesday = utcWeekday(2);
var utcWednesday = utcWeekday(3);
var utcThursday = utcWeekday(4);
var utcFriday = utcWeekday(5);
var utcSaturday = utcWeekday(6);

var utcSundays = utcSunday.range;
var utcMondays = utcMonday.range;
var utcTuesdays = utcTuesday.range;
var utcWednesdays = utcWednesday.range;
var utcThursdays = utcThursday.range;
var utcFridays = utcFriday.range;
var utcSaturdays = utcSaturday.range;

var utcMonth = newInterval(function(date) {
  date.setUTCDate(1);
  date.setUTCHours(0, 0, 0, 0);
}, function(date, step) {
  date.setUTCMonth(date.getUTCMonth() + step);
}, function(start, end) {
  return end.getUTCMonth() - start.getUTCMonth() + (end.getUTCFullYear() - start.getUTCFullYear()) * 12;
}, function(date) {
  return date.getUTCMonth();
});

var utcMonths = utcMonth.range;

var utcYear = newInterval(function(date) {
  date.setUTCMonth(0, 1);
  date.setUTCHours(0, 0, 0, 0);
}, function(date, step) {
  date.setUTCFullYear(date.getUTCFullYear() + step);
}, function(start, end) {
  return end.getUTCFullYear() - start.getUTCFullYear();
}, function(date) {
  return date.getUTCFullYear();
});

// An optimized implementation for this simple case.
utcYear.every = function(k) {
  return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function(date) {
    date.setUTCFullYear(Math.floor(date.getUTCFullYear() / k) * k);
    date.setUTCMonth(0, 1);
    date.setUTCHours(0, 0, 0, 0);
  }, function(date, step) {
    date.setUTCFullYear(date.getUTCFullYear() + step * k);
  });
};

var utcYears = utcYear.range;

function localDate(d) {
  if (0 <= d.y && d.y < 100) {
    var date = new Date(-1, d.m, d.d, d.H, d.M, d.S, d.L);
    date.setFullYear(d.y);
    return date;
  }
  return new Date(d.y, d.m, d.d, d.H, d.M, d.S, d.L);
}

function utcDate(d) {
  if (0 <= d.y && d.y < 100) {
    var date = new Date(Date.UTC(-1, d.m, d.d, d.H, d.M, d.S, d.L));
    date.setUTCFullYear(d.y);
    return date;
  }
  return new Date(Date.UTC(d.y, d.m, d.d, d.H, d.M, d.S, d.L));
}

function newYear(y) {
  return {y: y, m: 0, d: 1, H: 0, M: 0, S: 0, L: 0};
}

function formatLocale$1(locale) {
  var locale_dateTime = locale.dateTime,
      locale_date = locale.date,
      locale_time = locale.time,
      locale_periods = locale.periods,
      locale_weekdays = locale.days,
      locale_shortWeekdays = locale.shortDays,
      locale_months = locale.months,
      locale_shortMonths = locale.shortMonths;

  var periodRe = formatRe(locale_periods),
      periodLookup = formatLookup(locale_periods),
      weekdayRe = formatRe(locale_weekdays),
      weekdayLookup = formatLookup(locale_weekdays),
      shortWeekdayRe = formatRe(locale_shortWeekdays),
      shortWeekdayLookup = formatLookup(locale_shortWeekdays),
      monthRe = formatRe(locale_months),
      monthLookup = formatLookup(locale_months),
      shortMonthRe = formatRe(locale_shortMonths),
      shortMonthLookup = formatLookup(locale_shortMonths);

  var formats = {
    "a": formatShortWeekday,
    "A": formatWeekday,
    "b": formatShortMonth,
    "B": formatMonth,
    "c": null,
    "d": formatDayOfMonth,
    "e": formatDayOfMonth,
    "H": formatHour24,
    "I": formatHour12,
    "j": formatDayOfYear,
    "L": formatMilliseconds,
    "m": formatMonthNumber,
    "M": formatMinutes,
    "p": formatPeriod,
    "S": formatSeconds,
    "U": formatWeekNumberSunday,
    "w": formatWeekdayNumber,
    "W": formatWeekNumberMonday,
    "x": null,
    "X": null,
    "y": formatYear,
    "Y": formatFullYear,
    "Z": formatZone,
    "%": formatLiteralPercent
  };

  var utcFormats = {
    "a": formatUTCShortWeekday,
    "A": formatUTCWeekday,
    "b": formatUTCShortMonth,
    "B": formatUTCMonth,
    "c": null,
    "d": formatUTCDayOfMonth,
    "e": formatUTCDayOfMonth,
    "H": formatUTCHour24,
    "I": formatUTCHour12,
    "j": formatUTCDayOfYear,
    "L": formatUTCMilliseconds,
    "m": formatUTCMonthNumber,
    "M": formatUTCMinutes,
    "p": formatUTCPeriod,
    "S": formatUTCSeconds,
    "U": formatUTCWeekNumberSunday,
    "w": formatUTCWeekdayNumber,
    "W": formatUTCWeekNumberMonday,
    "x": null,
    "X": null,
    "y": formatUTCYear,
    "Y": formatUTCFullYear,
    "Z": formatUTCZone,
    "%": formatLiteralPercent
  };

  var parses = {
    "a": parseShortWeekday,
    "A": parseWeekday,
    "b": parseShortMonth,
    "B": parseMonth,
    "c": parseLocaleDateTime,
    "d": parseDayOfMonth,
    "e": parseDayOfMonth,
    "H": parseHour24,
    "I": parseHour24,
    "j": parseDayOfYear,
    "L": parseMilliseconds,
    "m": parseMonthNumber,
    "M": parseMinutes,
    "p": parsePeriod,
    "S": parseSeconds,
    "U": parseWeekNumberSunday,
    "w": parseWeekdayNumber,
    "W": parseWeekNumberMonday,
    "x": parseLocaleDate,
    "X": parseLocaleTime,
    "y": parseYear,
    "Y": parseFullYear,
    "Z": parseZone,
    "%": parseLiteralPercent
  };

  // These recursive directive definitions must be deferred.
  formats.x = newFormat(locale_date, formats);
  formats.X = newFormat(locale_time, formats);
  formats.c = newFormat(locale_dateTime, formats);
  utcFormats.x = newFormat(locale_date, utcFormats);
  utcFormats.X = newFormat(locale_time, utcFormats);
  utcFormats.c = newFormat(locale_dateTime, utcFormats);

  function newFormat(specifier, formats) {
    return function(date) {
      var string = [],
          i = -1,
          j = 0,
          n = specifier.length,
          c,
          pad,
          format;

      if (!(date instanceof Date)) date = new Date(+date);

      while (++i < n) {
        if (specifier.charCodeAt(i) === 37) {
          string.push(specifier.slice(j, i));
          if ((pad = pads[c = specifier.charAt(++i)]) != null) c = specifier.charAt(++i);
          else pad = c === "e" ? " " : "0";
          if (format = formats[c]) c = format(date, pad);
          string.push(c);
          j = i + 1;
        }
      }

      string.push(specifier.slice(j, i));
      return string.join("");
    };
  }

  function newParse(specifier, newDate) {
    return function(string) {
      var d = newYear(1900),
          i = parseSpecifier(d, specifier, string += "", 0);
      if (i != string.length) return null;

      // The am-pm flag is 0 for AM, and 1 for PM.
      if ("p" in d) d.H = d.H % 12 + d.p * 12;

      // Convert day-of-week and week-of-year to day-of-year.
      if ("W" in d || "U" in d) {
        if (!("w" in d)) d.w = "W" in d ? 1 : 0;
        var day$$1 = "Z" in d ? utcDate(newYear(d.y)).getUTCDay() : newDate(newYear(d.y)).getDay();
        d.m = 0;
        d.d = "W" in d ? (d.w + 6) % 7 + d.W * 7 - (day$$1 + 5) % 7 : d.w + d.U * 7 - (day$$1 + 6) % 7;
      }

      // If a time zone is specified, all fields are interpreted as UTC and then
      // offset according to the specified time zone.
      if ("Z" in d) {
        d.H += d.Z / 100 | 0;
        d.M += d.Z % 100;
        return utcDate(d);
      }

      // Otherwise, all fields are in local time.
      return newDate(d);
    };
  }

  function parseSpecifier(d, specifier, string, j) {
    var i = 0,
        n = specifier.length,
        m = string.length,
        c,
        parse;

    while (i < n) {
      if (j >= m) return -1;
      c = specifier.charCodeAt(i++);
      if (c === 37) {
        c = specifier.charAt(i++);
        parse = parses[c in pads ? specifier.charAt(i++) : c];
        if (!parse || ((j = parse(d, string, j)) < 0)) return -1;
      } else if (c != string.charCodeAt(j++)) {
        return -1;
      }
    }

    return j;
  }

  function parsePeriod(d, string, i) {
    var n = periodRe.exec(string.slice(i));
    return n ? (d.p = periodLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseShortWeekday(d, string, i) {
    var n = shortWeekdayRe.exec(string.slice(i));
    return n ? (d.w = shortWeekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseWeekday(d, string, i) {
    var n = weekdayRe.exec(string.slice(i));
    return n ? (d.w = weekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseShortMonth(d, string, i) {
    var n = shortMonthRe.exec(string.slice(i));
    return n ? (d.m = shortMonthLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseMonth(d, string, i) {
    var n = monthRe.exec(string.slice(i));
    return n ? (d.m = monthLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseLocaleDateTime(d, string, i) {
    return parseSpecifier(d, locale_dateTime, string, i);
  }

  function parseLocaleDate(d, string, i) {
    return parseSpecifier(d, locale_date, string, i);
  }

  function parseLocaleTime(d, string, i) {
    return parseSpecifier(d, locale_time, string, i);
  }

  function formatShortWeekday(d) {
    return locale_shortWeekdays[d.getDay()];
  }

  function formatWeekday(d) {
    return locale_weekdays[d.getDay()];
  }

  function formatShortMonth(d) {
    return locale_shortMonths[d.getMonth()];
  }

  function formatMonth(d) {
    return locale_months[d.getMonth()];
  }

  function formatPeriod(d) {
    return locale_periods[+(d.getHours() >= 12)];
  }

  function formatUTCShortWeekday(d) {
    return locale_shortWeekdays[d.getUTCDay()];
  }

  function formatUTCWeekday(d) {
    return locale_weekdays[d.getUTCDay()];
  }

  function formatUTCShortMonth(d) {
    return locale_shortMonths[d.getUTCMonth()];
  }

  function formatUTCMonth(d) {
    return locale_months[d.getUTCMonth()];
  }

  function formatUTCPeriod(d) {
    return locale_periods[+(d.getUTCHours() >= 12)];
  }

  return {
    format: function(specifier) {
      var f = newFormat(specifier += "", formats);
      f.toString = function() { return specifier; };
      return f;
    },
    parse: function(specifier) {
      var p = newParse(specifier += "", localDate);
      p.toString = function() { return specifier; };
      return p;
    },
    utcFormat: function(specifier) {
      var f = newFormat(specifier += "", utcFormats);
      f.toString = function() { return specifier; };
      return f;
    },
    utcParse: function(specifier) {
      var p = newParse(specifier, utcDate);
      p.toString = function() { return specifier; };
      return p;
    }
  };
}

var pads = {"-": "", "_": " ", "0": "0"};
var numberRe = /^\s*\d+/;
var percentRe = /^%/;
var requoteRe = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;

function pad(value, fill, width) {
  var sign = value < 0 ? "-" : "",
      string = (sign ? -value : value) + "",
      length = string.length;
  return sign + (length < width ? new Array(width - length + 1).join(fill) + string : string);
}

function requote(s) {
  return s.replace(requoteRe, "\\$&");
}

function formatRe(names) {
  return new RegExp("^(?:" + names.map(requote).join("|") + ")", "i");
}

function formatLookup(names) {
  var map = {}, i = -1, n = names.length;
  while (++i < n) map[names[i].toLowerCase()] = i;
  return map;
}

function parseWeekdayNumber(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 1));
  return n ? (d.w = +n[0], i + n[0].length) : -1;
}

function parseWeekNumberSunday(d, string, i) {
  var n = numberRe.exec(string.slice(i));
  return n ? (d.U = +n[0], i + n[0].length) : -1;
}

function parseWeekNumberMonday(d, string, i) {
  var n = numberRe.exec(string.slice(i));
  return n ? (d.W = +n[0], i + n[0].length) : -1;
}

function parseFullYear(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 4));
  return n ? (d.y = +n[0], i + n[0].length) : -1;
}

function parseYear(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.y = +n[0] + (+n[0] > 68 ? 1900 : 2000), i + n[0].length) : -1;
}

function parseZone(d, string, i) {
  var n = /^(Z)|([+-]\d\d)(?:\:?(\d\d))?/.exec(string.slice(i, i + 6));
  return n ? (d.Z = n[1] ? 0 : -(n[2] + (n[3] || "00")), i + n[0].length) : -1;
}

function parseMonthNumber(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.m = n[0] - 1, i + n[0].length) : -1;
}

function parseDayOfMonth(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.d = +n[0], i + n[0].length) : -1;
}

function parseDayOfYear(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 3));
  return n ? (d.m = 0, d.d = +n[0], i + n[0].length) : -1;
}

function parseHour24(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.H = +n[0], i + n[0].length) : -1;
}

function parseMinutes(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.M = +n[0], i + n[0].length) : -1;
}

function parseSeconds(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.S = +n[0], i + n[0].length) : -1;
}

function parseMilliseconds(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 3));
  return n ? (d.L = +n[0], i + n[0].length) : -1;
}

function parseLiteralPercent(d, string, i) {
  var n = percentRe.exec(string.slice(i, i + 1));
  return n ? i + n[0].length : -1;
}

function formatDayOfMonth(d, p) {
  return pad(d.getDate(), p, 2);
}

function formatHour24(d, p) {
  return pad(d.getHours(), p, 2);
}

function formatHour12(d, p) {
  return pad(d.getHours() % 12 || 12, p, 2);
}

function formatDayOfYear(d, p) {
  return pad(1 + day.count(year(d), d), p, 3);
}

function formatMilliseconds(d, p) {
  return pad(d.getMilliseconds(), p, 3);
}

function formatMonthNumber(d, p) {
  return pad(d.getMonth() + 1, p, 2);
}

function formatMinutes(d, p) {
  return pad(d.getMinutes(), p, 2);
}

function formatSeconds(d, p) {
  return pad(d.getSeconds(), p, 2);
}

function formatWeekNumberSunday(d, p) {
  return pad(sunday.count(year(d), d), p, 2);
}

function formatWeekdayNumber(d) {
  return d.getDay();
}

function formatWeekNumberMonday(d, p) {
  return pad(monday.count(year(d), d), p, 2);
}

function formatYear(d, p) {
  return pad(d.getFullYear() % 100, p, 2);
}

function formatFullYear(d, p) {
  return pad(d.getFullYear() % 10000, p, 4);
}

function formatZone(d) {
  var z = d.getTimezoneOffset();
  return (z > 0 ? "-" : (z *= -1, "+"))
      + pad(z / 60 | 0, "0", 2)
      + pad(z % 60, "0", 2);
}

function formatUTCDayOfMonth(d, p) {
  return pad(d.getUTCDate(), p, 2);
}

function formatUTCHour24(d, p) {
  return pad(d.getUTCHours(), p, 2);
}

function formatUTCHour12(d, p) {
  return pad(d.getUTCHours() % 12 || 12, p, 2);
}

function formatUTCDayOfYear(d, p) {
  return pad(1 + utcDay.count(utcYear(d), d), p, 3);
}

function formatUTCMilliseconds(d, p) {
  return pad(d.getUTCMilliseconds(), p, 3);
}

function formatUTCMonthNumber(d, p) {
  return pad(d.getUTCMonth() + 1, p, 2);
}

function formatUTCMinutes(d, p) {
  return pad(d.getUTCMinutes(), p, 2);
}

function formatUTCSeconds(d, p) {
  return pad(d.getUTCSeconds(), p, 2);
}

function formatUTCWeekNumberSunday(d, p) {
  return pad(utcSunday.count(utcYear(d), d), p, 2);
}

function formatUTCWeekdayNumber(d) {
  return d.getUTCDay();
}

function formatUTCWeekNumberMonday(d, p) {
  return pad(utcMonday.count(utcYear(d), d), p, 2);
}

function formatUTCYear(d, p) {
  return pad(d.getUTCFullYear() % 100, p, 2);
}

function formatUTCFullYear(d, p) {
  return pad(d.getUTCFullYear() % 10000, p, 4);
}

function formatUTCZone() {
  return "+0000";
}

function formatLiteralPercent() {
  return "%";
}

var locale$2;





defaultLocale$1({
  dateTime: "%x, %X",
  date: "%-m/%-d/%Y",
  time: "%-I:%M:%S %p",
  periods: ["AM", "PM"],
  days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
  shortDays: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
  months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
  shortMonths: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
});

function defaultLocale$1(definition) {
  locale$2 = formatLocale$1(definition);
  exports.timeFormat = locale$2.format;
  exports.timeParse = locale$2.parse;
  exports.utcFormat = locale$2.utcFormat;
  exports.utcParse = locale$2.utcParse;
  return locale$2;
}

var isoSpecifier = "%Y-%m-%dT%H:%M:%S.%LZ";

function formatIsoNative(date) {
  return date.toISOString();
}

var formatIso = Date.prototype.toISOString
    ? formatIsoNative
    : exports.utcFormat(isoSpecifier);

function parseIsoNative(string) {
  var date = new Date(string);
  return isNaN(date) ? null : date;
}

var parseIso = +new Date("2000-01-01T00:00:00.000Z")
    ? parseIsoNative
    : exports.utcParse(isoSpecifier);

var durationSecond = 1000;
var durationMinute = durationSecond * 60;
var durationHour = durationMinute * 60;
var durationDay = durationHour * 24;
var durationWeek = durationDay * 7;
var durationMonth = durationDay * 30;
var durationYear = durationDay * 365;

function date$1(t) {
  return new Date(t);
}

function number$4(t) {
  return t instanceof Date ? +t : +new Date(+t);
}

function calendar(year$$1, month$$1, week, day$$1, hour$$1, minute$$1, second$$1, millisecond$$1, format) {
  var scale = continuous(deinterpolateLinear, reinterpolate),
      invert = scale.invert,
      domain = scale.domain;

  var formatMillisecond = format(".%L"),
      formatSecond = format(":%S"),
      formatMinute = format("%I:%M"),
      formatHour = format("%I %p"),
      formatDay = format("%a %d"),
      formatWeek = format("%b %d"),
      formatMonth = format("%B"),
      formatYear = format("%Y");

  var tickIntervals = [
    [second$$1,  1,      durationSecond],
    [second$$1,  5,  5 * durationSecond],
    [second$$1, 15, 15 * durationSecond],
    [second$$1, 30, 30 * durationSecond],
    [minute$$1,  1,      durationMinute],
    [minute$$1,  5,  5 * durationMinute],
    [minute$$1, 15, 15 * durationMinute],
    [minute$$1, 30, 30 * durationMinute],
    [  hour$$1,  1,      durationHour  ],
    [  hour$$1,  3,  3 * durationHour  ],
    [  hour$$1,  6,  6 * durationHour  ],
    [  hour$$1, 12, 12 * durationHour  ],
    [   day$$1,  1,      durationDay   ],
    [   day$$1,  2,  2 * durationDay   ],
    [  week,  1,      durationWeek  ],
    [ month$$1,  1,      durationMonth ],
    [ month$$1,  3,  3 * durationMonth ],
    [  year$$1,  1,      durationYear  ]
  ];

  function tickFormat(date) {
    return (second$$1(date) < date ? formatMillisecond
        : minute$$1(date) < date ? formatSecond
        : hour$$1(date) < date ? formatMinute
        : day$$1(date) < date ? formatHour
        : month$$1(date) < date ? (week(date) < date ? formatDay : formatWeek)
        : year$$1(date) < date ? formatMonth
        : formatYear)(date);
  }

  function tickInterval(interval, start, stop, step) {
    if (interval == null) interval = 10;

    // If a desired tick count is specified, pick a reasonable tick interval
    // based on the extent of the domain and a rough estimate of tick size.
    // Otherwise, assume interval is already a time interval and use it.
    if (typeof interval === "number") {
      var target = Math.abs(stop - start) / interval,
          i = bisector$1(function(i) { return i[2]; }).right(tickIntervals, target);
      if (i === tickIntervals.length) {
        step = tickStep$1(start / durationYear, stop / durationYear, interval);
        interval = year$$1;
      } else if (i) {
        i = tickIntervals[target / tickIntervals[i - 1][2] < tickIntervals[i][2] / target ? i - 1 : i];
        step = i[1];
        interval = i[0];
      } else {
        step = tickStep$1(start, stop, interval);
        interval = millisecond$$1;
      }
    }

    return step == null ? interval : interval.every(step);
  }

  scale.invert = function(y) {
    return new Date(invert(y));
  };

  scale.domain = function(_) {
    return arguments.length ? domain(map$4.call(_, number$4)) : domain().map(date$1);
  };

  scale.ticks = function(interval, step) {
    var d = domain(),
        t0 = d[0],
        t1 = d[d.length - 1],
        r = t1 < t0,
        t;
    if (r) t = t0, t0 = t1, t1 = t;
    t = tickInterval(interval, t0, t1, step);
    t = t ? t.range(t0, t1 + 1) : []; // inclusive stop
    return r ? t.reverse() : t;
  };

  scale.tickFormat = function(count, specifier) {
    return specifier == null ? tickFormat : format(specifier);
  };

  scale.nice = function(interval, step) {
    var d = domain();
    return (interval = tickInterval(interval, d[0], d[d.length - 1], step))
        ? domain(nice(d, interval))
        : scale;
  };

  scale.copy = function() {
    return copy(scale, calendar(year$$1, month$$1, week, day$$1, hour$$1, minute$$1, second$$1, millisecond$$1, format));
  };

  return scale;
}

var time = function() {
  return calendar(year, month, sunday, day, hour, minute, second, millisecond, exports.timeFormat).domain([new Date(2000, 0, 1), new Date(2000, 0, 2)]);
};

var utcTime = function() {
  return calendar(utcYear, utcMonth, utcSunday, utcDay, utcHour, utcMinute, second, millisecond, exports.utcFormat).domain([Date.UTC(2000, 0, 1), Date.UTC(2000, 0, 2)]);
};

var colors = function(s) {
  return s.match(/.{6}/g).map(function(x) {
    return "#" + x;
  });
};

var category10 = colors("1f77b4ff7f0e2ca02cd627289467bd8c564be377c27f7f7fbcbd2217becf");

var category20b = colors("393b795254a36b6ecf9c9ede6379398ca252b5cf6bcedb9c8c6d31bd9e39e7ba52e7cb94843c39ad494ad6616be7969c7b4173a55194ce6dbdde9ed6");

var category20c = colors("3182bd6baed69ecae1c6dbefe6550dfd8d3cfdae6bfdd0a231a35474c476a1d99bc7e9c0756bb19e9ac8bcbddcdadaeb636363969696bdbdbdd9d9d9");

var category20 = colors("1f77b4aec7e8ff7f0effbb782ca02c98df8ad62728ff98969467bdc5b0d58c564bc49c94e377c2f7b6d27f7f7fc7c7c7bcbd22dbdb8d17becf9edae5");

var cubehelix$3 = cubehelixLong(cubehelix(300, 0.5, 0.0), cubehelix(-240, 0.5, 1.0));

var warm = cubehelixLong(cubehelix(-100, 0.75, 0.35), cubehelix(80, 1.50, 0.8));

var cool = cubehelixLong(cubehelix(260, 0.75, 0.35), cubehelix(80, 1.50, 0.8));

var rainbow = cubehelix();

var rainbow$1 = function(t) {
  if (t < 0 || t > 1) t -= Math.floor(t);
  var ts = Math.abs(t - 0.5);
  rainbow.h = 360 * t - 100;
  rainbow.s = 1.5 - 1.5 * ts;
  rainbow.l = 0.8 - 0.9 * ts;
  return rainbow + "";
};

function ramp(range) {
  var n = range.length;
  return function(t) {
    return range[Math.max(0, Math.min(n - 1, Math.floor(t * n)))];
  };
}

var viridis = ramp(colors("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"));

var magma = ramp(colors("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"));

var inferno = ramp(colors("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"));

var plasma = ramp(colors("0d088710078813078916078a19068c1b068d1d068e20068f2206902406912605912805922a05932c05942e05952f059631059733059735049837049938049a3a049a3c049b3e049c3f049c41049d43039e44039e46039f48039f4903a04b03a14c02a14e02a25002a25102a35302a35502a45601a45801a45901a55b01a55c01a65e01a66001a66100a76300a76400a76600a76700a86900a86a00a86c00a86e00a86f00a87100a87201a87401a87501a87701a87801a87a02a87b02a87d03a87e03a88004a88104a78305a78405a78606a68707a68808a68a09a58b0aa58d0ba58e0ca48f0da4910ea3920fa39410a29511a19613a19814a099159f9a169f9c179e9d189d9e199da01a9ca11b9ba21d9aa31e9aa51f99a62098a72197a82296aa2395ab2494ac2694ad2793ae2892b02991b12a90b22b8fb32c8eb42e8db52f8cb6308bb7318ab83289ba3388bb3488bc3587bd3786be3885bf3984c03a83c13b82c23c81c33d80c43e7fc5407ec6417dc7427cc8437bc9447aca457acb4679cc4778cc4977cd4a76ce4b75cf4c74d04d73d14e72d24f71d35171d45270d5536fd5546ed6556dd7566cd8576bd9586ada5a6ada5b69db5c68dc5d67dd5e66de5f65de6164df6263e06363e16462e26561e26660e3685fe4695ee56a5de56b5de66c5ce76e5be76f5ae87059e97158e97257ea7457eb7556eb7655ec7754ed7953ed7a52ee7b51ef7c51ef7e50f07f4ff0804ef1814df1834cf2844bf3854bf3874af48849f48948f58b47f58c46f68d45f68f44f79044f79143f79342f89441f89540f9973ff9983ef99a3efa9b3dfa9c3cfa9e3bfb9f3afba139fba238fca338fca537fca636fca835fca934fdab33fdac33fdae32fdaf31fdb130fdb22ffdb42ffdb52efeb72dfeb82cfeba2cfebb2bfebd2afebe2afec029fdc229fdc328fdc527fdc627fdc827fdca26fdcb26fccd25fcce25fcd025fcd225fbd324fbd524fbd724fad824fada24f9dc24f9dd25f8df25f8e125f7e225f7e425f6e626f6e826f5e926f5eb27f4ed27f3ee27f3f027f2f227f1f426f1f525f0f724f0f921"));

function sequential(interpolator) {
  var x0 = 0,
      x1 = 1,
      clamp = false;

  function scale(x) {
    var t = (x - x0) / (x1 - x0);
    return interpolator(clamp ? Math.max(0, Math.min(1, t)) : t);
  }

  scale.domain = function(_) {
    return arguments.length ? (x0 = +_[0], x1 = +_[1], scale) : [x0, x1];
  };

  scale.clamp = function(_) {
    return arguments.length ? (clamp = !!_, scale) : clamp;
  };

  scale.interpolator = function(_) {
    return arguments.length ? (interpolator = _, scale) : interpolator;
  };

  scale.copy = function() {
    return sequential(interpolator).domain([x0, x1]).clamp(clamp);
  };

  return linearish(scale);
}

var constant$11 = function(x) {
  return function constant() {
    return x;
  };
};

var abs$1 = Math.abs;
var atan2$1 = Math.atan2;
var cos$2 = Math.cos;
var max$3 = Math.max;
var min$2 = Math.min;
var sin$2 = Math.sin;
var sqrt$2 = Math.sqrt;

var epsilon$3 = 1e-12;
var pi$4 = Math.PI;
var halfPi$3 = pi$4 / 2;
var tau$4 = 2 * pi$4;

function acos$1(x) {
  return x > 1 ? 0 : x < -1 ? pi$4 : Math.acos(x);
}

function asin$1(x) {
  return x >= 1 ? halfPi$3 : x <= -1 ? -halfPi$3 : Math.asin(x);
}

function arcInnerRadius(d) {
  return d.innerRadius;
}

function arcOuterRadius(d) {
  return d.outerRadius;
}

function arcStartAngle(d) {
  return d.startAngle;
}

function arcEndAngle(d) {
  return d.endAngle;
}

function arcPadAngle(d) {
  return d && d.padAngle; // Note: optional!
}

function intersect(x0, y0, x1, y1, x2, y2, x3, y3) {
  var x10 = x1 - x0, y10 = y1 - y0,
      x32 = x3 - x2, y32 = y3 - y2,
      t = (x32 * (y0 - y2) - y32 * (x0 - x2)) / (y32 * x10 - x32 * y10);
  return [x0 + t * x10, y0 + t * y10];
}

// Compute perpendicular offset line of length rc.
// http://mathworld.wolfram.com/Circle-LineIntersection.html
function cornerTangents(x0, y0, x1, y1, r1, rc, cw) {
  var x01 = x0 - x1,
      y01 = y0 - y1,
      lo = (cw ? rc : -rc) / sqrt$2(x01 * x01 + y01 * y01),
      ox = lo * y01,
      oy = -lo * x01,
      x11 = x0 + ox,
      y11 = y0 + oy,
      x10 = x1 + ox,
      y10 = y1 + oy,
      x00 = (x11 + x10) / 2,
      y00 = (y11 + y10) / 2,
      dx = x10 - x11,
      dy = y10 - y11,
      d2 = dx * dx + dy * dy,
      r = r1 - rc,
      D = x11 * y10 - x10 * y11,
      d = (dy < 0 ? -1 : 1) * sqrt$2(max$3(0, r * r * d2 - D * D)),
      cx0 = (D * dy - dx * d) / d2,
      cy0 = (-D * dx - dy * d) / d2,
      cx1 = (D * dy + dx * d) / d2,
      cy1 = (-D * dx + dy * d) / d2,
      dx0 = cx0 - x00,
      dy0 = cy0 - y00,
      dx1 = cx1 - x00,
      dy1 = cy1 - y00;

  // Pick the closer of the two intersection points.
  // TODO Is there a faster way to determine which intersection to use?
  if (dx0 * dx0 + dy0 * dy0 > dx1 * dx1 + dy1 * dy1) cx0 = cx1, cy0 = cy1;

  return {
    cx: cx0,
    cy: cy0,
    x01: -ox,
    y01: -oy,
    x11: cx0 * (r1 / r - 1),
    y11: cy0 * (r1 / r - 1)
  };
}

var arc = function() {
  var innerRadius = arcInnerRadius,
      outerRadius = arcOuterRadius,
      cornerRadius = constant$11(0),
      padRadius = null,
      startAngle = arcStartAngle,
      endAngle = arcEndAngle,
      padAngle = arcPadAngle,
      context = null;

  function arc() {
    var buffer,
        r,
        r0 = +innerRadius.apply(this, arguments),
        r1 = +outerRadius.apply(this, arguments),
        a0 = startAngle.apply(this, arguments) - halfPi$3,
        a1 = endAngle.apply(this, arguments) - halfPi$3,
        da = abs$1(a1 - a0),
        cw = a1 > a0;

    if (!context) context = buffer = path();

    // Ensure that the outer radius is always larger than the inner radius.
    if (r1 < r0) r = r1, r1 = r0, r0 = r;

    // Is it a point?
    if (!(r1 > epsilon$3)) context.moveTo(0, 0);

    // Or is it a circle or annulus?
    else if (da > tau$4 - epsilon$3) {
      context.moveTo(r1 * cos$2(a0), r1 * sin$2(a0));
      context.arc(0, 0, r1, a0, a1, !cw);
      if (r0 > epsilon$3) {
        context.moveTo(r0 * cos$2(a1), r0 * sin$2(a1));
        context.arc(0, 0, r0, a1, a0, cw);
      }
    }

    // Or is it a circular or annular sector?
    else {
      var a01 = a0,
          a11 = a1,
          a00 = a0,
          a10 = a1,
          da0 = da,
          da1 = da,
          ap = padAngle.apply(this, arguments) / 2,
          rp = (ap > epsilon$3) && (padRadius ? +padRadius.apply(this, arguments) : sqrt$2(r0 * r0 + r1 * r1)),
          rc = min$2(abs$1(r1 - r0) / 2, +cornerRadius.apply(this, arguments)),
          rc0 = rc,
          rc1 = rc,
          t0,
          t1;

      // Apply padding? Note that since r1 ≥ r0, da1 ≥ da0.
      if (rp > epsilon$3) {
        var p0 = asin$1(rp / r0 * sin$2(ap)),
            p1 = asin$1(rp / r1 * sin$2(ap));
        if ((da0 -= p0 * 2) > epsilon$3) p0 *= (cw ? 1 : -1), a00 += p0, a10 -= p0;
        else da0 = 0, a00 = a10 = (a0 + a1) / 2;
        if ((da1 -= p1 * 2) > epsilon$3) p1 *= (cw ? 1 : -1), a01 += p1, a11 -= p1;
        else da1 = 0, a01 = a11 = (a0 + a1) / 2;
      }

      var x01 = r1 * cos$2(a01),
          y01 = r1 * sin$2(a01),
          x10 = r0 * cos$2(a10),
          y10 = r0 * sin$2(a10);

      // Apply rounded corners?
      if (rc > epsilon$3) {
        var x11 = r1 * cos$2(a11),
            y11 = r1 * sin$2(a11),
            x00 = r0 * cos$2(a00),
            y00 = r0 * sin$2(a00);

        // Restrict the corner radius according to the sector angle.
        if (da < pi$4) {
          var oc = da0 > epsilon$3 ? intersect(x01, y01, x00, y00, x11, y11, x10, y10) : [x10, y10],
              ax = x01 - oc[0],
              ay = y01 - oc[1],
              bx = x11 - oc[0],
              by = y11 - oc[1],
              kc = 1 / sin$2(acos$1((ax * bx + ay * by) / (sqrt$2(ax * ax + ay * ay) * sqrt$2(bx * bx + by * by))) / 2),
              lc = sqrt$2(oc[0] * oc[0] + oc[1] * oc[1]);
          rc0 = min$2(rc, (r0 - lc) / (kc - 1));
          rc1 = min$2(rc, (r1 - lc) / (kc + 1));
        }
      }

      // Is the sector collapsed to a line?
      if (!(da1 > epsilon$3)) context.moveTo(x01, y01);

      // Does the sector’s outer ring have rounded corners?
      else if (rc1 > epsilon$3) {
        t0 = cornerTangents(x00, y00, x01, y01, r1, rc1, cw);
        t1 = cornerTangents(x11, y11, x10, y10, r1, rc1, cw);

        context.moveTo(t0.cx + t0.x01, t0.cy + t0.y01);

        // Have the corners merged?
        if (rc1 < rc) context.arc(t0.cx, t0.cy, rc1, atan2$1(t0.y01, t0.x01), atan2$1(t1.y01, t1.x01), !cw);

        // Otherwise, draw the two corners and the ring.
        else {
          context.arc(t0.cx, t0.cy, rc1, atan2$1(t0.y01, t0.x01), atan2$1(t0.y11, t0.x11), !cw);
          context.arc(0, 0, r1, atan2$1(t0.cy + t0.y11, t0.cx + t0.x11), atan2$1(t1.cy + t1.y11, t1.cx + t1.x11), !cw);
          context.arc(t1.cx, t1.cy, rc1, atan2$1(t1.y11, t1.x11), atan2$1(t1.y01, t1.x01), !cw);
        }
      }

      // Or is the outer ring just a circular arc?
      else context.moveTo(x01, y01), context.arc(0, 0, r1, a01, a11, !cw);

      // Is there no inner ring, and it’s a circular sector?
      // Or perhaps it’s an annular sector collapsed due to padding?
      if (!(r0 > epsilon$3) || !(da0 > epsilon$3)) context.lineTo(x10, y10);

      // Does the sector’s inner ring (or point) have rounded corners?
      else if (rc0 > epsilon$3) {
        t0 = cornerTangents(x10, y10, x11, y11, r0, -rc0, cw);
        t1 = cornerTangents(x01, y01, x00, y00, r0, -rc0, cw);

        context.lineTo(t0.cx + t0.x01, t0.cy + t0.y01);

        // Have the corners merged?
        if (rc0 < rc) context.arc(t0.cx, t0.cy, rc0, atan2$1(t0.y01, t0.x01), atan2$1(t1.y01, t1.x01), !cw);

        // Otherwise, draw the two corners and the ring.
        else {
          context.arc(t0.cx, t0.cy, rc0, atan2$1(t0.y01, t0.x01), atan2$1(t0.y11, t0.x11), !cw);
          context.arc(0, 0, r0, atan2$1(t0.cy + t0.y11, t0.cx + t0.x11), atan2$1(t1.cy + t1.y11, t1.cx + t1.x11), cw);
          context.arc(t1.cx, t1.cy, rc0, atan2$1(t1.y11, t1.x11), atan2$1(t1.y01, t1.x01), !cw);
        }
      }

      // Or is the inner ring just a circular arc?
      else context.arc(0, 0, r0, a10, a00, cw);
    }

    context.closePath();

    if (buffer) return context = null, buffer + "" || null;
  }

  arc.centroid = function() {
    var r = (+innerRadius.apply(this, arguments) + +outerRadius.apply(this, arguments)) / 2,
        a = (+startAngle.apply(this, arguments) + +endAngle.apply(this, arguments)) / 2 - pi$4 / 2;
    return [cos$2(a) * r, sin$2(a) * r];
  };

  arc.innerRadius = function(_) {
    return arguments.length ? (innerRadius = typeof _ === "function" ? _ : constant$11(+_), arc) : innerRadius;
  };

  arc.outerRadius = function(_) {
    return arguments.length ? (outerRadius = typeof _ === "function" ? _ : constant$11(+_), arc) : outerRadius;
  };

  arc.cornerRadius = function(_) {
    return arguments.length ? (cornerRadius = typeof _ === "function" ? _ : constant$11(+_), arc) : cornerRadius;
  };

  arc.padRadius = function(_) {
    return arguments.length ? (padRadius = _ == null ? null : typeof _ === "function" ? _ : constant$11(+_), arc) : padRadius;
  };

  arc.startAngle = function(_) {
    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$11(+_), arc) : startAngle;
  };

  arc.endAngle = function(_) {
    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$11(+_), arc) : endAngle;
  };

  arc.padAngle = function(_) {
    return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant$11(+_), arc) : padAngle;
  };

  arc.context = function(_) {
    return arguments.length ? ((context = _ == null ? null : _), arc) : context;
  };

  return arc;
};

function Linear(context) {
  this._context = context;
}

Linear.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._point = 0;
  },
  lineEnd: function() {
    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
      case 1: this._point = 2; // proceed
      default: this._context.lineTo(x, y); break;
    }
  }
};

var curveLinear = function(context) {
  return new Linear(context);
};

function x$3(p) {
  return p[0];
}

function y$3(p) {
  return p[1];
}

var line = function() {
  var x$$1 = x$3,
      y$$1 = y$3,
      defined = constant$11(true),
      context = null,
      curve = curveLinear,
      output = null;

  function line(data) {
    var i,
        n = data.length,
        d,
        defined0 = false,
        buffer;

    if (context == null) output = curve(buffer = path());

    for (i = 0; i <= n; ++i) {
      if (!(i < n && defined(d = data[i], i, data)) === defined0) {
        if (defined0 = !defined0) output.lineStart();
        else output.lineEnd();
      }
      if (defined0) output.point(+x$$1(d, i, data), +y$$1(d, i, data));
    }

    if (buffer) return output = null, buffer + "" || null;
  }

  line.x = function(_) {
    return arguments.length ? (x$$1 = typeof _ === "function" ? _ : constant$11(+_), line) : x$$1;
  };

  line.y = function(_) {
    return arguments.length ? (y$$1 = typeof _ === "function" ? _ : constant$11(+_), line) : y$$1;
  };

  line.defined = function(_) {
    return arguments.length ? (defined = typeof _ === "function" ? _ : constant$11(!!_), line) : defined;
  };

  line.curve = function(_) {
    return arguments.length ? (curve = _, context != null && (output = curve(context)), line) : curve;
  };

  line.context = function(_) {
    return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), line) : context;
  };

  return line;
};

var area$2 = function() {
  var x0 = x$3,
      x1 = null,
      y0 = constant$11(0),
      y1 = y$3,
      defined = constant$11(true),
      context = null,
      curve = curveLinear,
      output = null;

  function area(data) {
    var i,
        j,
        k,
        n = data.length,
        d,
        defined0 = false,
        buffer,
        x0z = new Array(n),
        y0z = new Array(n);

    if (context == null) output = curve(buffer = path());

    for (i = 0; i <= n; ++i) {
      if (!(i < n && defined(d = data[i], i, data)) === defined0) {
        if (defined0 = !defined0) {
          j = i;
          output.areaStart();
          output.lineStart();
        } else {
          output.lineEnd();
          output.lineStart();
          for (k = i - 1; k >= j; --k) {
            output.point(x0z[k], y0z[k]);
          }
          output.lineEnd();
          output.areaEnd();
        }
      }
      if (defined0) {
        x0z[i] = +x0(d, i, data), y0z[i] = +y0(d, i, data);
        output.point(x1 ? +x1(d, i, data) : x0z[i], y1 ? +y1(d, i, data) : y0z[i]);
      }
    }

    if (buffer) return output = null, buffer + "" || null;
  }

  function arealine() {
    return line().defined(defined).curve(curve).context(context);
  }

  area.x = function(_) {
    return arguments.length ? (x0 = typeof _ === "function" ? _ : constant$11(+_), x1 = null, area) : x0;
  };

  area.x0 = function(_) {
    return arguments.length ? (x0 = typeof _ === "function" ? _ : constant$11(+_), area) : x0;
  };

  area.x1 = function(_) {
    return arguments.length ? (x1 = _ == null ? null : typeof _ === "function" ? _ : constant$11(+_), area) : x1;
  };

  area.y = function(_) {
    return arguments.length ? (y0 = typeof _ === "function" ? _ : constant$11(+_), y1 = null, area) : y0;
  };

  area.y0 = function(_) {
    return arguments.length ? (y0 = typeof _ === "function" ? _ : constant$11(+_), area) : y0;
  };

  area.y1 = function(_) {
    return arguments.length ? (y1 = _ == null ? null : typeof _ === "function" ? _ : constant$11(+_), area) : y1;
  };

  area.lineX0 =
  area.lineY0 = function() {
    return arealine().x(x0).y(y0);
  };

  area.lineY1 = function() {
    return arealine().x(x0).y(y1);
  };

  area.lineX1 = function() {
    return arealine().x(x1).y(y0);
  };

  area.defined = function(_) {
    return arguments.length ? (defined = typeof _ === "function" ? _ : constant$11(!!_), area) : defined;
  };

  area.curve = function(_) {
    return arguments.length ? (curve = _, context != null && (output = curve(context)), area) : curve;
  };

  area.context = function(_) {
    return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), area) : context;
  };

  return area;
};

var descending$2 = function(a, b) {
  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
};

var identity$8 = function(d) {
  return d;
};

var pie = function() {
  var value = identity$8,
      sortValues = descending$2,
      sort = null,
      startAngle = constant$11(0),
      endAngle = constant$11(tau$4),
      padAngle = constant$11(0);

  function pie(data) {
    var i,
        n = data.length,
        j,
        k,
        sum = 0,
        index = new Array(n),
        arcs = new Array(n),
        a0 = +startAngle.apply(this, arguments),
        da = Math.min(tau$4, Math.max(-tau$4, endAngle.apply(this, arguments) - a0)),
        a1,
        p = Math.min(Math.abs(da) / n, padAngle.apply(this, arguments)),
        pa = p * (da < 0 ? -1 : 1),
        v;

    for (i = 0; i < n; ++i) {
      if ((v = arcs[index[i] = i] = +value(data[i], i, data)) > 0) {
        sum += v;
      }
    }

    // Optionally sort the arcs by previously-computed values or by data.
    if (sortValues != null) index.sort(function(i, j) { return sortValues(arcs[i], arcs[j]); });
    else if (sort != null) index.sort(function(i, j) { return sort(data[i], data[j]); });

    // Compute the arcs! They are stored in the original data's order.
    for (i = 0, k = sum ? (da - n * pa) / sum : 0; i < n; ++i, a0 = a1) {
      j = index[i], v = arcs[j], a1 = a0 + (v > 0 ? v * k : 0) + pa, arcs[j] = {
        data: data[j],
        index: i,
        value: v,
        startAngle: a0,
        endAngle: a1,
        padAngle: p
      };
    }

    return arcs;
  }

  pie.value = function(_) {
    return arguments.length ? (value = typeof _ === "function" ? _ : constant$11(+_), pie) : value;
  };

  pie.sortValues = function(_) {
    return arguments.length ? (sortValues = _, sort = null, pie) : sortValues;
  };

  pie.sort = function(_) {
    return arguments.length ? (sort = _, sortValues = null, pie) : sort;
  };

  pie.startAngle = function(_) {
    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$11(+_), pie) : startAngle;
  };

  pie.endAngle = function(_) {
    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$11(+_), pie) : endAngle;
  };

  pie.padAngle = function(_) {
    return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant$11(+_), pie) : padAngle;
  };

  return pie;
};

var curveRadialLinear = curveRadial(curveLinear);

function Radial(curve) {
  this._curve = curve;
}

Radial.prototype = {
  areaStart: function() {
    this._curve.areaStart();
  },
  areaEnd: function() {
    this._curve.areaEnd();
  },
  lineStart: function() {
    this._curve.lineStart();
  },
  lineEnd: function() {
    this._curve.lineEnd();
  },
  point: function(a, r) {
    this._curve.point(r * Math.sin(a), r * -Math.cos(a));
  }
};

function curveRadial(curve) {

  function radial(context) {
    return new Radial(curve(context));
  }

  radial._curve = curve;

  return radial;
}

function lineRadial(l) {
  var c = l.curve;

  l.angle = l.x, delete l.x;
  l.radius = l.y, delete l.y;

  l.curve = function(_) {
    return arguments.length ? c(curveRadial(_)) : c()._curve;
  };

  return l;
}

var lineRadial$1 = function() {
  return lineRadial(line().curve(curveRadialLinear));
};

var areaRadial = function() {
  var a = area$2().curve(curveRadialLinear),
      c = a.curve,
      x0 = a.lineX0,
      x1 = a.lineX1,
      y0 = a.lineY0,
      y1 = a.lineY1;

  a.angle = a.x, delete a.x;
  a.startAngle = a.x0, delete a.x0;
  a.endAngle = a.x1, delete a.x1;
  a.radius = a.y, delete a.y;
  a.innerRadius = a.y0, delete a.y0;
  a.outerRadius = a.y1, delete a.y1;
  a.lineStartAngle = function() { return lineRadial(x0()); }, delete a.lineX0;
  a.lineEndAngle = function() { return lineRadial(x1()); }, delete a.lineX1;
  a.lineInnerRadius = function() { return lineRadial(y0()); }, delete a.lineY0;
  a.lineOuterRadius = function() { return lineRadial(y1()); }, delete a.lineY1;

  a.curve = function(_) {
    return arguments.length ? c(curveRadial(_)) : c()._curve;
  };

  return a;
};

var pointRadial = function(x, y) {
  return [(y = +y) * Math.cos(x -= Math.PI / 2), y * Math.sin(x)];
};

var slice$7 = Array.prototype.slice;

function linkSource(d) {
  return d.source;
}

function linkTarget(d) {
  return d.target;
}

function link$2(curve) {
  var source = linkSource,
      target = linkTarget,
      x$$1 = x$3,
      y$$1 = y$3,
      context = null;

  function link() {
    var buffer, argv = slice$7.call(arguments), s = source.apply(this, argv), t = target.apply(this, argv);
    if (!context) context = buffer = path();
    curve(context, +x$$1.apply(this, (argv[0] = s, argv)), +y$$1.apply(this, argv), +x$$1.apply(this, (argv[0] = t, argv)), +y$$1.apply(this, argv));
    if (buffer) return context = null, buffer + "" || null;
  }

  link.source = function(_) {
    return arguments.length ? (source = _, link) : source;
  };

  link.target = function(_) {
    return arguments.length ? (target = _, link) : target;
  };

  link.x = function(_) {
    return arguments.length ? (x$$1 = typeof _ === "function" ? _ : constant$11(+_), link) : x$$1;
  };

  link.y = function(_) {
    return arguments.length ? (y$$1 = typeof _ === "function" ? _ : constant$11(+_), link) : y$$1;
  };

  link.context = function(_) {
    return arguments.length ? ((context = _ == null ? null : _), link) : context;
  };

  return link;
}

function curveHorizontal(context, x0, y0, x1, y1) {
  context.moveTo(x0, y0);
  context.bezierCurveTo(x0 = (x0 + x1) / 2, y0, x0, y1, x1, y1);
}

function curveVertical(context, x0, y0, x1, y1) {
  context.moveTo(x0, y0);
  context.bezierCurveTo(x0, y0 = (y0 + y1) / 2, x1, y0, x1, y1);
}

function curveRadial$1(context, x0, y0, x1, y1) {
  var p0 = pointRadial(x0, y0),
      p1 = pointRadial(x0, y0 = (y0 + y1) / 2),
      p2 = pointRadial(x1, y0),
      p3 = pointRadial(x1, y1);
  context.moveTo(p0[0], p0[1]);
  context.bezierCurveTo(p1[0], p1[1], p2[0], p2[1], p3[0], p3[1]);
}

function linkHorizontal() {
  return link$2(curveHorizontal);
}

function linkVertical() {
  return link$2(curveVertical);
}

function linkRadial() {
  var l = link$2(curveRadial$1);
  l.angle = l.x, delete l.x;
  l.radius = l.y, delete l.y;
  return l;
}

var circle$2 = {
  draw: function(context, size) {
    var r = Math.sqrt(size / pi$4);
    context.moveTo(r, 0);
    context.arc(0, 0, r, 0, tau$4);
  }
};

var cross$3 = {
  draw: function(context, size) {
    var r = Math.sqrt(size / 5) / 2;
    context.moveTo(-3 * r, -r);
    context.lineTo(-r, -r);
    context.lineTo(-r, -3 * r);
    context.lineTo(r, -3 * r);
    context.lineTo(r, -r);
    context.lineTo(3 * r, -r);
    context.lineTo(3 * r, r);
    context.lineTo(r, r);
    context.lineTo(r, 3 * r);
    context.lineTo(-r, 3 * r);
    context.lineTo(-r, r);
    context.lineTo(-3 * r, r);
    context.closePath();
  }
};

var tan30 = Math.sqrt(1 / 3);
var tan30_2 = tan30 * 2;

var diamond = {
  draw: function(context, size) {
    var y = Math.sqrt(size / tan30_2),
        x = y * tan30;
    context.moveTo(0, -y);
    context.lineTo(x, 0);
    context.lineTo(0, y);
    context.lineTo(-x, 0);
    context.closePath();
  }
};

var ka = 0.89081309152928522810;
var kr = Math.sin(pi$4 / 10) / Math.sin(7 * pi$4 / 10);
var kx = Math.sin(tau$4 / 10) * kr;
var ky = -Math.cos(tau$4 / 10) * kr;

var star = {
  draw: function(context, size) {
    var r = Math.sqrt(size * ka),
        x = kx * r,
        y = ky * r;
    context.moveTo(0, -r);
    context.lineTo(x, y);
    for (var i = 1; i < 5; ++i) {
      var a = tau$4 * i / 5,
          c = Math.cos(a),
          s = Math.sin(a);
      context.lineTo(s * r, -c * r);
      context.lineTo(c * x - s * y, s * x + c * y);
    }
    context.closePath();
  }
};

var square = {
  draw: function(context, size) {
    var w = Math.sqrt(size),
        x = -w / 2;
    context.rect(x, x, w, w);
  }
};

var sqrt3 = Math.sqrt(3);

var triangle = {
  draw: function(context, size) {
    var y = -Math.sqrt(size / (sqrt3 * 3));
    context.moveTo(0, y * 2);
    context.lineTo(-sqrt3 * y, -y);
    context.lineTo(sqrt3 * y, -y);
    context.closePath();
  }
};

var c = -0.5;
var s = Math.sqrt(3) / 2;
var k = 1 / Math.sqrt(12);
var a = (k / 2 + 1) * 3;

var wye = {
  draw: function(context, size) {
    var r = Math.sqrt(size / a),
        x0 = r / 2,
        y0 = r * k,
        x1 = x0,
        y1 = r * k + r,
        x2 = -x1,
        y2 = y1;
    context.moveTo(x0, y0);
    context.lineTo(x1, y1);
    context.lineTo(x2, y2);
    context.lineTo(c * x0 - s * y0, s * x0 + c * y0);
    context.lineTo(c * x1 - s * y1, s * x1 + c * y1);
    context.lineTo(c * x2 - s * y2, s * x2 + c * y2);
    context.lineTo(c * x0 + s * y0, c * y0 - s * x0);
    context.lineTo(c * x1 + s * y1, c * y1 - s * x1);
    context.lineTo(c * x2 + s * y2, c * y2 - s * x2);
    context.closePath();
  }
};

var symbols = [
  circle$2,
  cross$3,
  diamond,
  square,
  star,
  triangle,
  wye
];

var symbol = function() {
  var type = constant$11(circle$2),
      size = constant$11(64),
      context = null;

  function symbol() {
    var buffer;
    if (!context) context = buffer = path();
    type.apply(this, arguments).draw(context, +size.apply(this, arguments));
    if (buffer) return context = null, buffer + "" || null;
  }

  symbol.type = function(_) {
    return arguments.length ? (type = typeof _ === "function" ? _ : constant$11(_), symbol) : type;
  };

  symbol.size = function(_) {
    return arguments.length ? (size = typeof _ === "function" ? _ : constant$11(+_), symbol) : size;
  };

  symbol.context = function(_) {
    return arguments.length ? (context = _ == null ? null : _, symbol) : context;
  };

  return symbol;
};

var noop$2 = function() {};

function point$2(that, x, y) {
  that._context.bezierCurveTo(
    (2 * that._x0 + that._x1) / 3,
    (2 * that._y0 + that._y1) / 3,
    (that._x0 + 2 * that._x1) / 3,
    (that._y0 + 2 * that._y1) / 3,
    (that._x0 + 4 * that._x1 + x) / 6,
    (that._y0 + 4 * that._y1 + y) / 6
  );
}

function Basis(context) {
  this._context = context;
}

Basis.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x0 = this._x1 =
    this._y0 = this._y1 = NaN;
    this._point = 0;
  },
  lineEnd: function() {
    switch (this._point) {
      case 3: point$2(this, this._x1, this._y1); // proceed
      case 2: this._context.lineTo(this._x1, this._y1); break;
    }
    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
      case 1: this._point = 2; break;
      case 2: this._point = 3; this._context.lineTo((5 * this._x0 + this._x1) / 6, (5 * this._y0 + this._y1) / 6); // proceed
      default: point$2(this, x, y); break;
    }
    this._x0 = this._x1, this._x1 = x;
    this._y0 = this._y1, this._y1 = y;
  }
};

var basis$2 = function(context) {
  return new Basis(context);
};

function BasisClosed(context) {
  this._context = context;
}

BasisClosed.prototype = {
  areaStart: noop$2,
  areaEnd: noop$2,
  lineStart: function() {
    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 =
    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = NaN;
    this._point = 0;
  },
  lineEnd: function() {
    switch (this._point) {
      case 1: {
        this._context.moveTo(this._x2, this._y2);
        this._context.closePath();
        break;
      }
      case 2: {
        this._context.moveTo((this._x2 + 2 * this._x3) / 3, (this._y2 + 2 * this._y3) / 3);
        this._context.lineTo((this._x3 + 2 * this._x2) / 3, (this._y3 + 2 * this._y2) / 3);
        this._context.closePath();
        break;
      }
      case 3: {
        this.point(this._x2, this._y2);
        this.point(this._x3, this._y3);
        this.point(this._x4, this._y4);
        break;
      }
    }
  },
  point: function(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0: this._point = 1; this._x2 = x, this._y2 = y; break;
      case 1: this._point = 2; this._x3 = x, this._y3 = y; break;
      case 2: this._point = 3; this._x4 = x, this._y4 = y; this._context.moveTo((this._x0 + 4 * this._x1 + x) / 6, (this._y0 + 4 * this._y1 + y) / 6); break;
      default: point$2(this, x, y); break;
    }
    this._x0 = this._x1, this._x1 = x;
    this._y0 = this._y1, this._y1 = y;
  }
};

var basisClosed$1 = function(context) {
  return new BasisClosed(context);
};

function BasisOpen(context) {
  this._context = context;
}

BasisOpen.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x0 = this._x1 =
    this._y0 = this._y1 = NaN;
    this._point = 0;
  },
  lineEnd: function() {
    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0: this._point = 1; break;
      case 1: this._point = 2; break;
      case 2: this._point = 3; var x0 = (this._x0 + 4 * this._x1 + x) / 6, y0 = (this._y0 + 4 * this._y1 + y) / 6; this._line ? this._context.lineTo(x0, y0) : this._context.moveTo(x0, y0); break;
      case 3: this._point = 4; // proceed
      default: point$2(this, x, y); break;
    }
    this._x0 = this._x1, this._x1 = x;
    this._y0 = this._y1, this._y1 = y;
  }
};

var basisOpen = function(context) {
  return new BasisOpen(context);
};

function Bundle(context, beta) {
  this._basis = new Basis(context);
  this._beta = beta;
}

Bundle.prototype = {
  lineStart: function() {
    this._x = [];
    this._y = [];
    this._basis.lineStart();
  },
  lineEnd: function() {
    var x = this._x,
        y = this._y,
        j = x.length - 1;

    if (j > 0) {
      var x0 = x[0],
          y0 = y[0],
          dx = x[j] - x0,
          dy = y[j] - y0,
          i = -1,
          t;

      while (++i <= j) {
        t = i / j;
        this._basis.point(
          this._beta * x[i] + (1 - this._beta) * (x0 + t * dx),
          this._beta * y[i] + (1 - this._beta) * (y0 + t * dy)
        );
      }
    }

    this._x = this._y = null;
    this._basis.lineEnd();
  },
  point: function(x, y) {
    this._x.push(+x);
    this._y.push(+y);
  }
};

var bundle = ((function custom(beta) {

  function bundle(context) {
    return beta === 1 ? new Basis(context) : new Bundle(context, beta);
  }

  bundle.beta = function(beta) {
    return custom(+beta);
  };

  return bundle;
}))(0.85);

function point$3(that, x, y) {
  that._context.bezierCurveTo(
    that._x1 + that._k * (that._x2 - that._x0),
    that._y1 + that._k * (that._y2 - that._y0),
    that._x2 + that._k * (that._x1 - x),
    that._y2 + that._k * (that._y1 - y),
    that._x2,
    that._y2
  );
}

function Cardinal(context, tension) {
  this._context = context;
  this._k = (1 - tension) / 6;
}

Cardinal.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x0 = this._x1 = this._x2 =
    this._y0 = this._y1 = this._y2 = NaN;
    this._point = 0;
  },
  lineEnd: function() {
    switch (this._point) {
      case 2: this._context.lineTo(this._x2, this._y2); break;
      case 3: point$3(this, this._x1, this._y1); break;
    }
    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
      case 1: this._point = 2; this._x1 = x, this._y1 = y; break;
      case 2: this._point = 3; // proceed
      default: point$3(this, x, y); break;
    }
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var cardinal = ((function custom(tension) {

  function cardinal(context) {
    return new Cardinal(context, tension);
  }

  cardinal.tension = function(tension) {
    return custom(+tension);
  };

  return cardinal;
}))(0);

function CardinalClosed(context, tension) {
  this._context = context;
  this._k = (1 - tension) / 6;
}

CardinalClosed.prototype = {
  areaStart: noop$2,
  areaEnd: noop$2,
  lineStart: function() {
    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._x5 =
    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = this._y5 = NaN;
    this._point = 0;
  },
  lineEnd: function() {
    switch (this._point) {
      case 1: {
        this._context.moveTo(this._x3, this._y3);
        this._context.closePath();
        break;
      }
      case 2: {
        this._context.lineTo(this._x3, this._y3);
        this._context.closePath();
        break;
      }
      case 3: {
        this.point(this._x3, this._y3);
        this.point(this._x4, this._y4);
        this.point(this._x5, this._y5);
        break;
      }
    }
  },
  point: function(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0: this._point = 1; this._x3 = x, this._y3 = y; break;
      case 1: this._point = 2; this._context.moveTo(this._x4 = x, this._y4 = y); break;
      case 2: this._point = 3; this._x5 = x, this._y5 = y; break;
      default: point$3(this, x, y); break;
    }
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var cardinalClosed = ((function custom(tension) {

  function cardinal(context) {
    return new CardinalClosed(context, tension);
  }

  cardinal.tension = function(tension) {
    return custom(+tension);
  };

  return cardinal;
}))(0);

function CardinalOpen(context, tension) {
  this._context = context;
  this._k = (1 - tension) / 6;
}

CardinalOpen.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x0 = this._x1 = this._x2 =
    this._y0 = this._y1 = this._y2 = NaN;
    this._point = 0;
  },
  lineEnd: function() {
    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0: this._point = 1; break;
      case 1: this._point = 2; break;
      case 2: this._point = 3; this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2); break;
      case 3: this._point = 4; // proceed
      default: point$3(this, x, y); break;
    }
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var cardinalOpen = ((function custom(tension) {

  function cardinal(context) {
    return new CardinalOpen(context, tension);
  }

  cardinal.tension = function(tension) {
    return custom(+tension);
  };

  return cardinal;
}))(0);

function point$4(that, x, y) {
  var x1 = that._x1,
      y1 = that._y1,
      x2 = that._x2,
      y2 = that._y2;

  if (that._l01_a > epsilon$3) {
    var a = 2 * that._l01_2a + 3 * that._l01_a * that._l12_a + that._l12_2a,
        n = 3 * that._l01_a * (that._l01_a + that._l12_a);
    x1 = (x1 * a - that._x0 * that._l12_2a + that._x2 * that._l01_2a) / n;
    y1 = (y1 * a - that._y0 * that._l12_2a + that._y2 * that._l01_2a) / n;
  }

  if (that._l23_a > epsilon$3) {
    var b = 2 * that._l23_2a + 3 * that._l23_a * that._l12_a + that._l12_2a,
        m = 3 * that._l23_a * (that._l23_a + that._l12_a);
    x2 = (x2 * b + that._x1 * that._l23_2a - x * that._l12_2a) / m;
    y2 = (y2 * b + that._y1 * that._l23_2a - y * that._l12_2a) / m;
  }

  that._context.bezierCurveTo(x1, y1, x2, y2, that._x2, that._y2);
}

function CatmullRom(context, alpha) {
  this._context = context;
  this._alpha = alpha;
}

CatmullRom.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x0 = this._x1 = this._x2 =
    this._y0 = this._y1 = this._y2 = NaN;
    this._l01_a = this._l12_a = this._l23_a =
    this._l01_2a = this._l12_2a = this._l23_2a =
    this._point = 0;
  },
  lineEnd: function() {
    switch (this._point) {
      case 2: this._context.lineTo(this._x2, this._y2); break;
      case 3: this.point(this._x2, this._y2); break;
    }
    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function(x, y) {
    x = +x, y = +y;

    if (this._point) {
      var x23 = this._x2 - x,
          y23 = this._y2 - y;
      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
    }

    switch (this._point) {
      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
      case 1: this._point = 2; break;
      case 2: this._point = 3; // proceed
      default: point$4(this, x, y); break;
    }

    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var catmullRom = ((function custom(alpha) {

  function catmullRom(context) {
    return alpha ? new CatmullRom(context, alpha) : new Cardinal(context, 0);
  }

  catmullRom.alpha = function(alpha) {
    return custom(+alpha);
  };

  return catmullRom;
}))(0.5);

function CatmullRomClosed(context, alpha) {
  this._context = context;
  this._alpha = alpha;
}

CatmullRomClosed.prototype = {
  areaStart: noop$2,
  areaEnd: noop$2,
  lineStart: function() {
    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._x5 =
    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = this._y5 = NaN;
    this._l01_a = this._l12_a = this._l23_a =
    this._l01_2a = this._l12_2a = this._l23_2a =
    this._point = 0;
  },
  lineEnd: function() {
    switch (this._point) {
      case 1: {
        this._context.moveTo(this._x3, this._y3);
        this._context.closePath();
        break;
      }
      case 2: {
        this._context.lineTo(this._x3, this._y3);
        this._context.closePath();
        break;
      }
      case 3: {
        this.point(this._x3, this._y3);
        this.point(this._x4, this._y4);
        this.point(this._x5, this._y5);
        break;
      }
    }
  },
  point: function(x, y) {
    x = +x, y = +y;

    if (this._point) {
      var x23 = this._x2 - x,
          y23 = this._y2 - y;
      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
    }

    switch (this._point) {
      case 0: this._point = 1; this._x3 = x, this._y3 = y; break;
      case 1: this._point = 2; this._context.moveTo(this._x4 = x, this._y4 = y); break;
      case 2: this._point = 3; this._x5 = x, this._y5 = y; break;
      default: point$4(this, x, y); break;
    }

    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var catmullRomClosed = ((function custom(alpha) {

  function catmullRom(context) {
    return alpha ? new CatmullRomClosed(context, alpha) : new CardinalClosed(context, 0);
  }

  catmullRom.alpha = function(alpha) {
    return custom(+alpha);
  };

  return catmullRom;
}))(0.5);

function CatmullRomOpen(context, alpha) {
  this._context = context;
  this._alpha = alpha;
}

CatmullRomOpen.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x0 = this._x1 = this._x2 =
    this._y0 = this._y1 = this._y2 = NaN;
    this._l01_a = this._l12_a = this._l23_a =
    this._l01_2a = this._l12_2a = this._l23_2a =
    this._point = 0;
  },
  lineEnd: function() {
    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function(x, y) {
    x = +x, y = +y;

    if (this._point) {
      var x23 = this._x2 - x,
          y23 = this._y2 - y;
      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
    }

    switch (this._point) {
      case 0: this._point = 1; break;
      case 1: this._point = 2; break;
      case 2: this._point = 3; this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2); break;
      case 3: this._point = 4; // proceed
      default: point$4(this, x, y); break;
    }

    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var catmullRomOpen = ((function custom(alpha) {

  function catmullRom(context) {
    return alpha ? new CatmullRomOpen(context, alpha) : new CardinalOpen(context, 0);
  }

  catmullRom.alpha = function(alpha) {
    return custom(+alpha);
  };

  return catmullRom;
}))(0.5);

function LinearClosed(context) {
  this._context = context;
}

LinearClosed.prototype = {
  areaStart: noop$2,
  areaEnd: noop$2,
  lineStart: function() {
    this._point = 0;
  },
  lineEnd: function() {
    if (this._point) this._context.closePath();
  },
  point: function(x, y) {
    x = +x, y = +y;
    if (this._point) this._context.lineTo(x, y);
    else this._point = 1, this._context.moveTo(x, y);
  }
};

var linearClosed = function(context) {
  return new LinearClosed(context);
};

function sign$1(x) {
  return x < 0 ? -1 : 1;
}

// Calculate the slopes of the tangents (Hermite-type interpolation) based on
// the following paper: Steffen, M. 1990. A Simple Method for Monotonic
// Interpolation in One Dimension. Astronomy and Astrophysics, Vol. 239, NO.
// NOV(II), P. 443, 1990.
function slope3(that, x2, y2) {
  var h0 = that._x1 - that._x0,
      h1 = x2 - that._x1,
      s0 = (that._y1 - that._y0) / (h0 || h1 < 0 && -0),
      s1 = (y2 - that._y1) / (h1 || h0 < 0 && -0),
      p = (s0 * h1 + s1 * h0) / (h0 + h1);
  return (sign$1(s0) + sign$1(s1)) * Math.min(Math.abs(s0), Math.abs(s1), 0.5 * Math.abs(p)) || 0;
}

// Calculate a one-sided slope.
function slope2(that, t) {
  var h = that._x1 - that._x0;
  return h ? (3 * (that._y1 - that._y0) / h - t) / 2 : t;
}

// According to https://en.wikipedia.org/wiki/Cubic_Hermite_spline#Representations
// "you can express cubic Hermite interpolation in terms of cubic Bézier curves
// with respect to the four values p0, p0 + m0 / 3, p1 - m1 / 3, p1".
function point$5(that, t0, t1) {
  var x0 = that._x0,
      y0 = that._y0,
      x1 = that._x1,
      y1 = that._y1,
      dx = (x1 - x0) / 3;
  that._context.bezierCurveTo(x0 + dx, y0 + dx * t0, x1 - dx, y1 - dx * t1, x1, y1);
}

function MonotoneX(context) {
  this._context = context;
}

MonotoneX.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x0 = this._x1 =
    this._y0 = this._y1 =
    this._t0 = NaN;
    this._point = 0;
  },
  lineEnd: function() {
    switch (this._point) {
      case 2: this._context.lineTo(this._x1, this._y1); break;
      case 3: point$5(this, this._t0, slope2(this, this._t0)); break;
    }
    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function(x, y) {
    var t1 = NaN;

    x = +x, y = +y;
    if (x === this._x1 && y === this._y1) return; // Ignore coincident points.
    switch (this._point) {
      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
      case 1: this._point = 2; break;
      case 2: this._point = 3; point$5(this, slope2(this, t1 = slope3(this, x, y)), t1); break;
      default: point$5(this, this._t0, t1 = slope3(this, x, y)); break;
    }

    this._x0 = this._x1, this._x1 = x;
    this._y0 = this._y1, this._y1 = y;
    this._t0 = t1;
  }
};

function MonotoneY(context) {
  this._context = new ReflectContext(context);
}

(MonotoneY.prototype = Object.create(MonotoneX.prototype)).point = function(x, y) {
  MonotoneX.prototype.point.call(this, y, x);
};

function ReflectContext(context) {
  this._context = context;
}

ReflectContext.prototype = {
  moveTo: function(x, y) { this._context.moveTo(y, x); },
  closePath: function() { this._context.closePath(); },
  lineTo: function(x, y) { this._context.lineTo(y, x); },
  bezierCurveTo: function(x1, y1, x2, y2, x, y) { this._context.bezierCurveTo(y1, x1, y2, x2, y, x); }
};

function monotoneX(context) {
  return new MonotoneX(context);
}

function monotoneY(context) {
  return new MonotoneY(context);
}

function Natural(context) {
  this._context = context;
}

Natural.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x = [];
    this._y = [];
  },
  lineEnd: function() {
    var x = this._x,
        y = this._y,
        n = x.length;

    if (n) {
      this._line ? this._context.lineTo(x[0], y[0]) : this._context.moveTo(x[0], y[0]);
      if (n === 2) {
        this._context.lineTo(x[1], y[1]);
      } else {
        var px = controlPoints(x),
            py = controlPoints(y);
        for (var i0 = 0, i1 = 1; i1 < n; ++i0, ++i1) {
          this._context.bezierCurveTo(px[0][i0], py[0][i0], px[1][i0], py[1][i0], x[i1], y[i1]);
        }
      }
    }

    if (this._line || (this._line !== 0 && n === 1)) this._context.closePath();
    this._line = 1 - this._line;
    this._x = this._y = null;
  },
  point: function(x, y) {
    this._x.push(+x);
    this._y.push(+y);
  }
};

// See https://www.particleincell.com/2012/bezier-splines/ for derivation.
function controlPoints(x) {
  var i,
      n = x.length - 1,
      m,
      a = new Array(n),
      b = new Array(n),
      r = new Array(n);
  a[0] = 0, b[0] = 2, r[0] = x[0] + 2 * x[1];
  for (i = 1; i < n - 1; ++i) a[i] = 1, b[i] = 4, r[i] = 4 * x[i] + 2 * x[i + 1];
  a[n - 1] = 2, b[n - 1] = 7, r[n - 1] = 8 * x[n - 1] + x[n];
  for (i = 1; i < n; ++i) m = a[i] / b[i - 1], b[i] -= m, r[i] -= m * r[i - 1];
  a[n - 1] = r[n - 1] / b[n - 1];
  for (i = n - 2; i >= 0; --i) a[i] = (r[i] - a[i + 1]) / b[i];
  b[n - 1] = (x[n] + a[n - 1]) / 2;
  for (i = 0; i < n - 1; ++i) b[i] = 2 * x[i + 1] - a[i + 1];
  return [a, b];
}

var natural = function(context) {
  return new Natural(context);
};

function Step(context, t) {
  this._context = context;
  this._t = t;
}

Step.prototype = {
  areaStart: function() {
    this._line = 0;
  },
  areaEnd: function() {
    this._line = NaN;
  },
  lineStart: function() {
    this._x = this._y = NaN;
    this._point = 0;
  },
  lineEnd: function() {
    if (0 < this._t && this._t < 1 && this._point === 2) this._context.lineTo(this._x, this._y);
    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
    if (this._line >= 0) this._t = 1 - this._t, this._line = 1 - this._line;
  },
  point: function(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
      case 1: this._point = 2; // proceed
      default: {
        if (this._t <= 0) {
          this._context.lineTo(this._x, y);
          this._context.lineTo(x, y);
        } else {
          var x1 = this._x * (1 - this._t) + x * this._t;
          this._context.lineTo(x1, this._y);
          this._context.lineTo(x1, y);
        }
        break;
      }
    }
    this._x = x, this._y = y;
  }
};

var step = function(context) {
  return new Step(context, 0.5);
};

function stepBefore(context) {
  return new Step(context, 0);
}

function stepAfter(context) {
  return new Step(context, 1);
}

var none$1 = function(series, order) {
  if (!((n = series.length) > 1)) return;
  for (var i = 1, j, s0, s1 = series[order[0]], n, m = s1.length; i < n; ++i) {
    s0 = s1, s1 = series[order[i]];
    for (j = 0; j < m; ++j) {
      s1[j][1] += s1[j][0] = isNaN(s0[j][1]) ? s0[j][0] : s0[j][1];
    }
  }
};

var none$2 = function(series) {
  var n = series.length, o = new Array(n);
  while (--n >= 0) o[n] = n;
  return o;
};

function stackValue(d, key) {
  return d[key];
}

var stack = function() {
  var keys = constant$11([]),
      order = none$2,
      offset = none$1,
      value = stackValue;

  function stack(data) {
    var kz = keys.apply(this, arguments),
        i,
        m = data.length,
        n = kz.length,
        sz = new Array(n),
        oz;

    for (i = 0; i < n; ++i) {
      for (var ki = kz[i], si = sz[i] = new Array(m), j = 0, sij; j < m; ++j) {
        si[j] = sij = [0, +value(data[j], ki, j, data)];
        sij.data = data[j];
      }
      si.key = ki;
    }

    for (i = 0, oz = order(sz); i < n; ++i) {
      sz[oz[i]].index = i;
    }

    offset(sz, oz);
    return sz;
  }

  stack.keys = function(_) {
    return arguments.length ? (keys = typeof _ === "function" ? _ : constant$11(slice$7.call(_)), stack) : keys;
  };

  stack.value = function(_) {
    return arguments.length ? (value = typeof _ === "function" ? _ : constant$11(+_), stack) : value;
  };

  stack.order = function(_) {
    return arguments.length ? (order = _ == null ? none$2 : typeof _ === "function" ? _ : constant$11(slice$7.call(_)), stack) : order;
  };

  stack.offset = function(_) {
    return arguments.length ? (offset = _ == null ? none$1 : _, stack) : offset;
  };

  return stack;
};

var expand = function(series, order) {
  if (!((n = series.length) > 0)) return;
  for (var i, n, j = 0, m = series[0].length, y; j < m; ++j) {
    for (y = i = 0; i < n; ++i) y += series[i][j][1] || 0;
    if (y) for (i = 0; i < n; ++i) series[i][j][1] /= y;
  }
  none$1(series, order);
};

var diverging = function(series, order) {
  if (!((n = series.length) > 1)) return;
  for (var i, j = 0, d, dy, yp, yn, n, m = series[order[0]].length; j < m; ++j) {
    for (yp = yn = 0, i = 0; i < n; ++i) {
      if ((dy = (d = series[order[i]][j])[1] - d[0]) >= 0) {
        d[0] = yp, d[1] = yp += dy;
      } else if (dy < 0) {
        d[1] = yn, d[0] = yn += dy;
      } else {
        d[0] = yp;
      }
    }
  }
};

var silhouette = function(series, order) {
  if (!((n = series.length) > 0)) return;
  for (var j = 0, s0 = series[order[0]], n, m = s0.length; j < m; ++j) {
    for (var i = 0, y = 0; i < n; ++i) y += series[i][j][1] || 0;
    s0[j][1] += s0[j][0] = -y / 2;
  }
  none$1(series, order);
};

var wiggle = function(series, order) {
  if (!((n = series.length) > 0) || !((m = (s0 = series[order[0]]).length) > 0)) return;
  for (var y = 0, j = 1, s0, m, n; j < m; ++j) {
    for (var i = 0, s1 = 0, s2 = 0; i < n; ++i) {
      var si = series[order[i]],
          sij0 = si[j][1] || 0,
          sij1 = si[j - 1][1] || 0,
          s3 = (sij0 - sij1) / 2;
      for (var k = 0; k < i; ++k) {
        var sk = series[order[k]],
            skj0 = sk[j][1] || 0,
            skj1 = sk[j - 1][1] || 0;
        s3 += skj0 - skj1;
      }
      s1 += sij0, s2 += s3 * sij0;
    }
    s0[j - 1][1] += s0[j - 1][0] = y;
    if (s1) y -= s2 / s1;
  }
  s0[j - 1][1] += s0[j - 1][0] = y;
  none$1(series, order);
};

var ascending$3 = function(series) {
  var sums = series.map(sum$3);
  return none$2(series).sort(function(a, b) { return sums[a] - sums[b]; });
};

function sum$3(series) {
  var s = 0, i = -1, n = series.length, v;
  while (++i < n) if (v = +series[i][1]) s += v;
  return s;
}

var descending$3 = function(series) {
  return ascending$3(series).reverse();
};

var insideOut = function(series) {
  var n = series.length,
      i,
      j,
      sums = series.map(sum$3),
      order = none$2(series).sort(function(a, b) { return sums[b] - sums[a]; }),
      top = 0,
      bottom = 0,
      tops = [],
      bottoms = [];

  for (i = 0; i < n; ++i) {
    j = order[i];
    if (top < bottom) {
      top += sums[j];
      tops.push(j);
    } else {
      bottom += sums[j];
      bottoms.push(j);
    }
  }

  return bottoms.reverse().concat(tops);
};

var reverse = function(series) {
  return none$2(series).reverse();
};

var constant$12 = function(x) {
  return function() {
    return x;
  };
};

function x$4(d) {
  return d[0];
}

function y$4(d) {
  return d[1];
}

function RedBlackTree() {
  this._ = null; // root node
}

function RedBlackNode(node) {
  node.U = // parent node
  node.C = // color - true for red, false for black
  node.L = // left node
  node.R = // right node
  node.P = // previous node
  node.N = null; // next node
}

RedBlackTree.prototype = {
  constructor: RedBlackTree,

  insert: function(after, node) {
    var parent, grandpa, uncle;

    if (after) {
      node.P = after;
      node.N = after.N;
      if (after.N) after.N.P = node;
      after.N = node;
      if (after.R) {
        after = after.R;
        while (after.L) after = after.L;
        after.L = node;
      } else {
        after.R = node;
      }
      parent = after;
    } else if (this._) {
      after = RedBlackFirst(this._);
      node.P = null;
      node.N = after;
      after.P = after.L = node;
      parent = after;
    } else {
      node.P = node.N = null;
      this._ = node;
      parent = null;
    }
    node.L = node.R = null;
    node.U = parent;
    node.C = true;

    after = node;
    while (parent && parent.C) {
      grandpa = parent.U;
      if (parent === grandpa.L) {
        uncle = grandpa.R;
        if (uncle && uncle.C) {
          parent.C = uncle.C = false;
          grandpa.C = true;
          after = grandpa;
        } else {
          if (after === parent.R) {
            RedBlackRotateLeft(this, parent);
            after = parent;
            parent = after.U;
          }
          parent.C = false;
          grandpa.C = true;
          RedBlackRotateRight(this, grandpa);
        }
      } else {
        uncle = grandpa.L;
        if (uncle && uncle.C) {
          parent.C = uncle.C = false;
          grandpa.C = true;
          after = grandpa;
        } else {
          if (after === parent.L) {
            RedBlackRotateRight(this, parent);
            after = parent;
            parent = after.U;
          }
          parent.C = false;
          grandpa.C = true;
          RedBlackRotateLeft(this, grandpa);
        }
      }
      parent = after.U;
    }
    this._.C = false;
  },

  remove: function(node) {
    if (node.N) node.N.P = node.P;
    if (node.P) node.P.N = node.N;
    node.N = node.P = null;

    var parent = node.U,
        sibling,
        left = node.L,
        right = node.R,
        next,
        red;

    if (!left) next = right;
    else if (!right) next = left;
    else next = RedBlackFirst(right);

    if (parent) {
      if (parent.L === node) parent.L = next;
      else parent.R = next;
    } else {
      this._ = next;
    }

    if (left && right) {
      red = next.C;
      next.C = node.C;
      next.L = left;
      left.U = next;
      if (next !== right) {
        parent = next.U;
        next.U = node.U;
        node = next.R;
        parent.L = node;
        next.R = right;
        right.U = next;
      } else {
        next.U = parent;
        parent = next;
        node = next.R;
      }
    } else {
      red = node.C;
      node = next;
    }

    if (node) node.U = parent;
    if (red) return;
    if (node && node.C) { node.C = false; return; }

    do {
      if (node === this._) break;
      if (node === parent.L) {
        sibling = parent.R;
        if (sibling.C) {
          sibling.C = false;
          parent.C = true;
          RedBlackRotateLeft(this, parent);
          sibling = parent.R;
        }
        if ((sibling.L && sibling.L.C)
            || (sibling.R && sibling.R.C)) {
          if (!sibling.R || !sibling.R.C) {
            sibling.L.C = false;
            sibling.C = true;
            RedBlackRotateRight(this, sibling);
            sibling = parent.R;
          }
          sibling.C = parent.C;
          parent.C = sibling.R.C = false;
          RedBlackRotateLeft(this, parent);
          node = this._;
          break;
        }
      } else {
        sibling = parent.L;
        if (sibling.C) {
          sibling.C = false;
          parent.C = true;
          RedBlackRotateRight(this, parent);
          sibling = parent.L;
        }
        if ((sibling.L && sibling.L.C)
          || (sibling.R && sibling.R.C)) {
          if (!sibling.L || !sibling.L.C) {
            sibling.R.C = false;
            sibling.C = true;
            RedBlackRotateLeft(this, sibling);
            sibling = parent.L;
          }
          sibling.C = parent.C;
          parent.C = sibling.L.C = false;
          RedBlackRotateRight(this, parent);
          node = this._;
          break;
        }
      }
      sibling.C = true;
      node = parent;
      parent = parent.U;
    } while (!node.C);

    if (node) node.C = false;
  }
};

function RedBlackRotateLeft(tree, node) {
  var p = node,
      q = node.R,
      parent = p.U;

  if (parent) {
    if (parent.L === p) parent.L = q;
    else parent.R = q;
  } else {
    tree._ = q;
  }

  q.U = parent;
  p.U = q;
  p.R = q.L;
  if (p.R) p.R.U = p;
  q.L = p;
}

function RedBlackRotateRight(tree, node) {
  var p = node,
      q = node.L,
      parent = p.U;

  if (parent) {
    if (parent.L === p) parent.L = q;
    else parent.R = q;
  } else {
    tree._ = q;
  }

  q.U = parent;
  p.U = q;
  p.L = q.R;
  if (p.L) p.L.U = p;
  q.R = p;
}

function RedBlackFirst(node) {
  while (node.L) node = node.L;
  return node;
}

function createEdge(left, right, v0, v1) {
  var edge = [null, null],
      index = edges.push(edge) - 1;
  edge.left = left;
  edge.right = right;
  if (v0) setEdgeEnd(edge, left, right, v0);
  if (v1) setEdgeEnd(edge, right, left, v1);
  cells[left.index].halfedges.push(index);
  cells[right.index].halfedges.push(index);
  return edge;
}

function createBorderEdge(left, v0, v1) {
  var edge = [v0, v1];
  edge.left = left;
  return edge;
}

function setEdgeEnd(edge, left, right, vertex) {
  if (!edge[0] && !edge[1]) {
    edge[0] = vertex;
    edge.left = left;
    edge.right = right;
  } else if (edge.left === right) {
    edge[1] = vertex;
  } else {
    edge[0] = vertex;
  }
}

// Liang–Barsky line clipping.
function clipEdge(edge, x0, y0, x1, y1) {
  var a = edge[0],
      b = edge[1],
      ax = a[0],
      ay = a[1],
      bx = b[0],
      by = b[1],
      t0 = 0,
      t1 = 1,
      dx = bx - ax,
      dy = by - ay,
      r;

  r = x0 - ax;
  if (!dx && r > 0) return;
  r /= dx;
  if (dx < 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  } else if (dx > 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  }

  r = x1 - ax;
  if (!dx && r < 0) return;
  r /= dx;
  if (dx < 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  } else if (dx > 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  }

  r = y0 - ay;
  if (!dy && r > 0) return;
  r /= dy;
  if (dy < 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  } else if (dy > 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  }

  r = y1 - ay;
  if (!dy && r < 0) return;
  r /= dy;
  if (dy < 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  } else if (dy > 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  }

  if (!(t0 > 0) && !(t1 < 1)) return true; // TODO Better check?

  if (t0 > 0) edge[0] = [ax + t0 * dx, ay + t0 * dy];
  if (t1 < 1) edge[1] = [ax + t1 * dx, ay + t1 * dy];
  return true;
}

function connectEdge(edge, x0, y0, x1, y1) {
  var v1 = edge[1];
  if (v1) return true;

  var v0 = edge[0],
      left = edge.left,
      right = edge.right,
      lx = left[0],
      ly = left[1],
      rx = right[0],
      ry = right[1],
      fx = (lx + rx) / 2,
      fy = (ly + ry) / 2,
      fm,
      fb;

  if (ry === ly) {
    if (fx < x0 || fx >= x1) return;
    if (lx > rx) {
      if (!v0) v0 = [fx, y0];
      else if (v0[1] >= y1) return;
      v1 = [fx, y1];
    } else {
      if (!v0) v0 = [fx, y1];
      else if (v0[1] < y0) return;
      v1 = [fx, y0];
    }
  } else {
    fm = (lx - rx) / (ry - ly);
    fb = fy - fm * fx;
    if (fm < -1 || fm > 1) {
      if (lx > rx) {
        if (!v0) v0 = [(y0 - fb) / fm, y0];
        else if (v0[1] >= y1) return;
        v1 = [(y1 - fb) / fm, y1];
      } else {
        if (!v0) v0 = [(y1 - fb) / fm, y1];
        else if (v0[1] < y0) return;
        v1 = [(y0 - fb) / fm, y0];
      }
    } else {
      if (ly < ry) {
        if (!v0) v0 = [x0, fm * x0 + fb];
        else if (v0[0] >= x1) return;
        v1 = [x1, fm * x1 + fb];
      } else {
        if (!v0) v0 = [x1, fm * x1 + fb];
        else if (v0[0] < x0) return;
        v1 = [x0, fm * x0 + fb];
      }
    }
  }

  edge[0] = v0;
  edge[1] = v1;
  return true;
}

function clipEdges(x0, y0, x1, y1) {
  var i = edges.length,
      edge;

  while (i--) {
    if (!connectEdge(edge = edges[i], x0, y0, x1, y1)
        || !clipEdge(edge, x0, y0, x1, y1)
        || !(Math.abs(edge[0][0] - edge[1][0]) > epsilon$4
            || Math.abs(edge[0][1] - edge[1][1]) > epsilon$4)) {
      delete edges[i];
    }
  }
}

function createCell(site) {
  return cells[site.index] = {
    site: site,
    halfedges: []
  };
}

function cellHalfedgeAngle(cell, edge) {
  var site = cell.site,
      va = edge.left,
      vb = edge.right;
  if (site === vb) vb = va, va = site;
  if (vb) return Math.atan2(vb[1] - va[1], vb[0] - va[0]);
  if (site === va) va = edge[1], vb = edge[0];
  else va = edge[0], vb = edge[1];
  return Math.atan2(va[0] - vb[0], vb[1] - va[1]);
}

function cellHalfedgeStart(cell, edge) {
  return edge[+(edge.left !== cell.site)];
}

function cellHalfedgeEnd(cell, edge) {
  return edge[+(edge.left === cell.site)];
}

function sortCellHalfedges() {
  for (var i = 0, n = cells.length, cell, halfedges, j, m; i < n; ++i) {
    if ((cell = cells[i]) && (m = (halfedges = cell.halfedges).length)) {
      var index = new Array(m),
          array = new Array(m);
      for (j = 0; j < m; ++j) index[j] = j, array[j] = cellHalfedgeAngle(cell, edges[halfedges[j]]);
      index.sort(function(i, j) { return array[j] - array[i]; });
      for (j = 0; j < m; ++j) array[j] = halfedges[index[j]];
      for (j = 0; j < m; ++j) halfedges[j] = array[j];
    }
  }
}

function clipCells(x0, y0, x1, y1) {
  var nCells = cells.length,
      iCell,
      cell,
      site,
      iHalfedge,
      halfedges,
      nHalfedges,
      start,
      startX,
      startY,
      end,
      endX,
      endY,
      cover = true;

  for (iCell = 0; iCell < nCells; ++iCell) {
    if (cell = cells[iCell]) {
      site = cell.site;
      halfedges = cell.halfedges;
      iHalfedge = halfedges.length;

      // Remove any dangling clipped edges.
      while (iHalfedge--) {
        if (!edges[halfedges[iHalfedge]]) {
          halfedges.splice(iHalfedge, 1);
        }
      }

      // Insert any border edges as necessary.
      iHalfedge = 0, nHalfedges = halfedges.length;
      while (iHalfedge < nHalfedges) {
        end = cellHalfedgeEnd(cell, edges[halfedges[iHalfedge]]), endX = end[0], endY = end[1];
        start = cellHalfedgeStart(cell, edges[halfedges[++iHalfedge % nHalfedges]]), startX = start[0], startY = start[1];
        if (Math.abs(endX - startX) > epsilon$4 || Math.abs(endY - startY) > epsilon$4) {
          halfedges.splice(iHalfedge, 0, edges.push(createBorderEdge(site, end,
              Math.abs(endX - x0) < epsilon$4 && y1 - endY > epsilon$4 ? [x0, Math.abs(startX - x0) < epsilon$4 ? startY : y1]
              : Math.abs(endY - y1) < epsilon$4 && x1 - endX > epsilon$4 ? [Math.abs(startY - y1) < epsilon$4 ? startX : x1, y1]
              : Math.abs(endX - x1) < epsilon$4 && endY - y0 > epsilon$4 ? [x1, Math.abs(startX - x1) < epsilon$4 ? startY : y0]
              : Math.abs(endY - y0) < epsilon$4 && endX - x0 > epsilon$4 ? [Math.abs(startY - y0) < epsilon$4 ? startX : x0, y0]
              : null)) - 1);
          ++nHalfedges;
        }
      }

      if (nHalfedges) cover = false;
    }
  }

  // If there weren’t any edges, have the closest site cover the extent.
  // It doesn’t matter which corner of the extent we measure!
  if (cover) {
    var dx, dy, d2, dc = Infinity;

    for (iCell = 0, cover = null; iCell < nCells; ++iCell) {
      if (cell = cells[iCell]) {
        site = cell.site;
        dx = site[0] - x0;
        dy = site[1] - y0;
        d2 = dx * dx + dy * dy;
        if (d2 < dc) dc = d2, cover = cell;
      }
    }

    if (cover) {
      var v00 = [x0, y0], v01 = [x0, y1], v11 = [x1, y1], v10 = [x1, y0];
      cover.halfedges.push(
        edges.push(createBorderEdge(site = cover.site, v00, v01)) - 1,
        edges.push(createBorderEdge(site, v01, v11)) - 1,
        edges.push(createBorderEdge(site, v11, v10)) - 1,
        edges.push(createBorderEdge(site, v10, v00)) - 1
      );
    }
  }

  // Lastly delete any cells with no edges; these were entirely clipped.
  for (iCell = 0; iCell < nCells; ++iCell) {
    if (cell = cells[iCell]) {
      if (!cell.halfedges.length) {
        delete cells[iCell];
      }
    }
  }
}

var circlePool = [];

var firstCircle;

function Circle() {
  RedBlackNode(this);
  this.x =
  this.y =
  this.arc =
  this.site =
  this.cy = null;
}

function attachCircle(arc) {
  var lArc = arc.P,
      rArc = arc.N;

  if (!lArc || !rArc) return;

  var lSite = lArc.site,
      cSite = arc.site,
      rSite = rArc.site;

  if (lSite === rSite) return;

  var bx = cSite[0],
      by = cSite[1],
      ax = lSite[0] - bx,
      ay = lSite[1] - by,
      cx = rSite[0] - bx,
      cy = rSite[1] - by;

  var d = 2 * (ax * cy - ay * cx);
  if (d >= -epsilon2$2) return;

  var ha = ax * ax + ay * ay,
      hc = cx * cx + cy * cy,
      x = (cy * ha - ay * hc) / d,
      y = (ax * hc - cx * ha) / d;

  var circle = circlePool.pop() || new Circle;
  circle.arc = arc;
  circle.site = cSite;
  circle.x = x + bx;
  circle.y = (circle.cy = y + by) + Math.sqrt(x * x + y * y); // y bottom

  arc.circle = circle;

  var before = null,
      node = circles._;

  while (node) {
    if (circle.y < node.y || (circle.y === node.y && circle.x <= node.x)) {
      if (node.L) node = node.L;
      else { before = node.P; break; }
    } else {
      if (node.R) node = node.R;
      else { before = node; break; }
    }
  }

  circles.insert(before, circle);
  if (!before) firstCircle = circle;
}

function detachCircle(arc) {
  var circle = arc.circle;
  if (circle) {
    if (!circle.P) firstCircle = circle.N;
    circles.remove(circle);
    circlePool.push(circle);
    RedBlackNode(circle);
    arc.circle = null;
  }
}

var beachPool = [];

function Beach() {
  RedBlackNode(this);
  this.edge =
  this.site =
  this.circle = null;
}

function createBeach(site) {
  var beach = beachPool.pop() || new Beach;
  beach.site = site;
  return beach;
}

function detachBeach(beach) {
  detachCircle(beach);
  beaches.remove(beach);
  beachPool.push(beach);
  RedBlackNode(beach);
}

function removeBeach(beach) {
  var circle = beach.circle,
      x = circle.x,
      y = circle.cy,
      vertex = [x, y],
      previous = beach.P,
      next = beach.N,
      disappearing = [beach];

  detachBeach(beach);

  var lArc = previous;
  while (lArc.circle
      && Math.abs(x - lArc.circle.x) < epsilon$4
      && Math.abs(y - lArc.circle.cy) < epsilon$4) {
    previous = lArc.P;
    disappearing.unshift(lArc);
    detachBeach(lArc);
    lArc = previous;
  }

  disappearing.unshift(lArc);
  detachCircle(lArc);

  var rArc = next;
  while (rArc.circle
      && Math.abs(x - rArc.circle.x) < epsilon$4
      && Math.abs(y - rArc.circle.cy) < epsilon$4) {
    next = rArc.N;
    disappearing.push(rArc);
    detachBeach(rArc);
    rArc = next;
  }

  disappearing.push(rArc);
  detachCircle(rArc);

  var nArcs = disappearing.length,
      iArc;
  for (iArc = 1; iArc < nArcs; ++iArc) {
    rArc = disappearing[iArc];
    lArc = disappearing[iArc - 1];
    setEdgeEnd(rArc.edge, lArc.site, rArc.site, vertex);
  }

  lArc = disappearing[0];
  rArc = disappearing[nArcs - 1];
  rArc.edge = createEdge(lArc.site, rArc.site, null, vertex);

  attachCircle(lArc);
  attachCircle(rArc);
}

function addBeach(site) {
  var x = site[0],
      directrix = site[1],
      lArc,
      rArc,
      dxl,
      dxr,
      node = beaches._;

  while (node) {
    dxl = leftBreakPoint(node, directrix) - x;
    if (dxl > epsilon$4) node = node.L; else {
      dxr = x - rightBreakPoint(node, directrix);
      if (dxr > epsilon$4) {
        if (!node.R) {
          lArc = node;
          break;
        }
        node = node.R;
      } else {
        if (dxl > -epsilon$4) {
          lArc = node.P;
          rArc = node;
        } else if (dxr > -epsilon$4) {
          lArc = node;
          rArc = node.N;
        } else {
          lArc = rArc = node;
        }
        break;
      }
    }
  }

  createCell(site);
  var newArc = createBeach(site);
  beaches.insert(lArc, newArc);

  if (!lArc && !rArc) return;

  if (lArc === rArc) {
    detachCircle(lArc);
    rArc = createBeach(lArc.site);
    beaches.insert(newArc, rArc);
    newArc.edge = rArc.edge = createEdge(lArc.site, newArc.site);
    attachCircle(lArc);
    attachCircle(rArc);
    return;
  }

  if (!rArc) { // && lArc
    newArc.edge = createEdge(lArc.site, newArc.site);
    return;
  }

  // else lArc !== rArc
  detachCircle(lArc);
  detachCircle(rArc);

  var lSite = lArc.site,
      ax = lSite[0],
      ay = lSite[1],
      bx = site[0] - ax,
      by = site[1] - ay,
      rSite = rArc.site,
      cx = rSite[0] - ax,
      cy = rSite[1] - ay,
      d = 2 * (bx * cy - by * cx),
      hb = bx * bx + by * by,
      hc = cx * cx + cy * cy,
      vertex = [(cy * hb - by * hc) / d + ax, (bx * hc - cx * hb) / d + ay];

  setEdgeEnd(rArc.edge, lSite, rSite, vertex);
  newArc.edge = createEdge(lSite, site, null, vertex);
  rArc.edge = createEdge(site, rSite, null, vertex);
  attachCircle(lArc);
  attachCircle(rArc);
}

function leftBreakPoint(arc, directrix) {
  var site = arc.site,
      rfocx = site[0],
      rfocy = site[1],
      pby2 = rfocy - directrix;

  if (!pby2) return rfocx;

  var lArc = arc.P;
  if (!lArc) return -Infinity;

  site = lArc.site;
  var lfocx = site[0],
      lfocy = site[1],
      plby2 = lfocy - directrix;

  if (!plby2) return lfocx;

  var hl = lfocx - rfocx,
      aby2 = 1 / pby2 - 1 / plby2,
      b = hl / plby2;

  if (aby2) return (-b + Math.sqrt(b * b - 2 * aby2 * (hl * hl / (-2 * plby2) - lfocy + plby2 / 2 + rfocy - pby2 / 2))) / aby2 + rfocx;

  return (rfocx + lfocx) / 2;
}

function rightBreakPoint(arc, directrix) {
  var rArc = arc.N;
  if (rArc) return leftBreakPoint(rArc, directrix);
  var site = arc.site;
  return site[1] === directrix ? site[0] : Infinity;
}

var epsilon$4 = 1e-6;
var epsilon2$2 = 1e-12;
var beaches;
var cells;
var circles;
var edges;

function triangleArea(a, b, c) {
  return (a[0] - c[0]) * (b[1] - a[1]) - (a[0] - b[0]) * (c[1] - a[1]);
}

function lexicographic(a, b) {
  return b[1] - a[1]
      || b[0] - a[0];
}

function Diagram(sites, extent) {
  var site = sites.sort(lexicographic).pop(),
      x,
      y,
      circle;

  edges = [];
  cells = new Array(sites.length);
  beaches = new RedBlackTree;
  circles = new RedBlackTree;

  while (true) {
    circle = firstCircle;
    if (site && (!circle || site[1] < circle.y || (site[1] === circle.y && site[0] < circle.x))) {
      if (site[0] !== x || site[1] !== y) {
        addBeach(site);
        x = site[0], y = site[1];
      }
      site = sites.pop();
    } else if (circle) {
      removeBeach(circle.arc);
    } else {
      break;
    }
  }

  sortCellHalfedges();

  if (extent) {
    var x0 = +extent[0][0],
        y0 = +extent[0][1],
        x1 = +extent[1][0],
        y1 = +extent[1][1];
    clipEdges(x0, y0, x1, y1);
    clipCells(x0, y0, x1, y1);
  }

  this.edges = edges;
  this.cells = cells;

  beaches =
  circles =
  edges =
  cells = null;
}

Diagram.prototype = {
  constructor: Diagram,

  polygons: function() {
    var edges = this.edges;

    return this.cells.map(function(cell) {
      var polygon = cell.halfedges.map(function(i) { return cellHalfedgeStart(cell, edges[i]); });
      polygon.data = cell.site.data;
      return polygon;
    });
  },

  triangles: function() {
    var triangles = [],
        edges = this.edges;

    this.cells.forEach(function(cell, i) {
      if (!(m = (halfedges = cell.halfedges).length)) return;
      var site = cell.site,
          halfedges,
          j = -1,
          m,
          s0,
          e1 = edges[halfedges[m - 1]],
          s1 = e1.left === site ? e1.right : e1.left;

      while (++j < m) {
        s0 = s1;
        e1 = edges[halfedges[j]];
        s1 = e1.left === site ? e1.right : e1.left;
        if (s0 && s1 && i < s0.index && i < s1.index && triangleArea(site, s0, s1) < 0) {
          triangles.push([site.data, s0.data, s1.data]);
        }
      }
    });

    return triangles;
  },

  links: function() {
    return this.edges.filter(function(edge) {
      return edge.right;
    }).map(function(edge) {
      return {
        source: edge.left.data,
        target: edge.right.data
      };
    });
  },

  find: function(x, y, radius) {
    var that = this, i0, i1 = that._found || 0, n = that.cells.length, cell;

    // Use the previously-found cell, or start with an arbitrary one.
    while (!(cell = that.cells[i1])) if (++i1 >= n) return null;
    var dx = x - cell.site[0], dy = y - cell.site[1], d2 = dx * dx + dy * dy;

    // Traverse the half-edges to find a closer cell, if any.
    do {
      cell = that.cells[i0 = i1], i1 = null;
      cell.halfedges.forEach(function(e) {
        var edge = that.edges[e], v = edge.left;
        if ((v === cell.site || !v) && !(v = edge.right)) return;
        var vx = x - v[0], vy = y - v[1], v2 = vx * vx + vy * vy;
        if (v2 < d2) d2 = v2, i1 = v.index;
      });
    } while (i1 !== null);

    that._found = i0;

    return radius == null || d2 <= radius * radius ? cell.site : null;
  }
};

var voronoi = function() {
  var x$$1 = x$4,
      y$$1 = y$4,
      extent = null;

  function voronoi(data) {
    return new Diagram(data.map(function(d, i) {
      var s = [Math.round(x$$1(d, i, data) / epsilon$4) * epsilon$4, Math.round(y$$1(d, i, data) / epsilon$4) * epsilon$4];
      s.index = i;
      s.data = d;
      return s;
    }), extent);
  }

  voronoi.polygons = function(data) {
    return voronoi(data).polygons();
  };

  voronoi.links = function(data) {
    return voronoi(data).links();
  };

  voronoi.triangles = function(data) {
    return voronoi(data).triangles();
  };

  voronoi.x = function(_) {
    return arguments.length ? (x$$1 = typeof _ === "function" ? _ : constant$12(+_), voronoi) : x$$1;
  };

  voronoi.y = function(_) {
    return arguments.length ? (y$$1 = typeof _ === "function" ? _ : constant$12(+_), voronoi) : y$$1;
  };

  voronoi.extent = function(_) {
    return arguments.length ? (extent = _ == null ? null : [[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]], voronoi) : extent && [[extent[0][0], extent[0][1]], [extent[1][0], extent[1][1]]];
  };

  voronoi.size = function(_) {
    return arguments.length ? (extent = _ == null ? null : [[0, 0], [+_[0], +_[1]]], voronoi) : extent && [extent[1][0] - extent[0][0], extent[1][1] - extent[0][1]];
  };

  return voronoi;
};

var constant$13 = function(x) {
  return function() {
    return x;
  };
};

function ZoomEvent(target, type, transform) {
  this.target = target;
  this.type = type;
  this.transform = transform;
}

function Transform(k, x, y) {
  this.k = k;
  this.x = x;
  this.y = y;
}

Transform.prototype = {
  constructor: Transform,
  scale: function(k) {
    return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
  },
  translate: function(x, y) {
    return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
  },
  apply: function(point) {
    return [point[0] * this.k + this.x, point[1] * this.k + this.y];
  },
  applyX: function(x) {
    return x * this.k + this.x;
  },
  applyY: function(y) {
    return y * this.k + this.y;
  },
  invert: function(location) {
    return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
  },
  invertX: function(x) {
    return (x - this.x) / this.k;
  },
  invertY: function(y) {
    return (y - this.y) / this.k;
  },
  rescaleX: function(x) {
    return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
  },
  rescaleY: function(y) {
    return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
  },
  toString: function() {
    return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
  }
};

var identity$9 = new Transform(1, 0, 0);

transform$1.prototype = Transform.prototype;

function transform$1(node) {
  return node.__zoom || identity$9;
}

function nopropagation$2() {
  exports.event.stopImmediatePropagation();
}

var noevent$2 = function() {
  exports.event.preventDefault();
  exports.event.stopImmediatePropagation();
};

// Ignore right-click, since that should open the context menu.
function defaultFilter$2() {
  return !exports.event.button;
}

function defaultExtent$1() {
  var e = this, w, h;
  if (e instanceof SVGElement) {
    e = e.ownerSVGElement || e;
    w = e.width.baseVal.value;
    h = e.height.baseVal.value;
  } else {
    w = e.clientWidth;
    h = e.clientHeight;
  }
  return [[0, 0], [w, h]];
}

function defaultTransform() {
  return this.__zoom || identity$9;
}

function defaultWheelDelta() {
  return -exports.event.deltaY * (exports.event.deltaMode ? 120 : 1) / 500;
}

function touchable$1() {
  return "ontouchstart" in this;
}

var zoom = function() {
  var filter = defaultFilter$2,
      extent = defaultExtent$1,
      wheelDelta = defaultWheelDelta,
      k0 = 0,
      k1 = Infinity,
      x0 = -k1,
      x1 = k1,
      y0 = x0,
      y1 = x1,
      duration = 250,
      interpolate$$1 = interpolateZoom,
      gestures = [],
      listeners = dispatch("start", "zoom", "end"),
      touchstarting,
      touchending,
      touchDelay = 500,
      wheelDelay = 150,
      clickDistance2 = 0;

  function zoom(selection$$1) {
    selection$$1
        .property("__zoom", defaultTransform)
        .on("wheel.zoom", wheeled)
        .on("mousedown.zoom", mousedowned)
        .on("dblclick.zoom", dblclicked)
      .filter(touchable$1)
        .on("touchstart.zoom", touchstarted)
        .on("touchmove.zoom", touchmoved)
        .on("touchend.zoom touchcancel.zoom", touchended)
        .style("touch-action", "none")
        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
  }

  zoom.transform = function(collection, transform) {
    var selection$$1 = collection.selection ? collection.selection() : collection;
    selection$$1.property("__zoom", defaultTransform);
    if (collection !== selection$$1) {
      schedule(collection, transform);
    } else {
      selection$$1.interrupt().each(function() {
        gesture(this, arguments)
            .start()
            .zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform)
            .end();
      });
    }
  };

  zoom.scaleBy = function(selection$$1, k) {
    zoom.scaleTo(selection$$1, function() {
      var k0 = this.__zoom.k,
          k1 = typeof k === "function" ? k.apply(this, arguments) : k;
      return k0 * k1;
    });
  };

  zoom.scaleTo = function(selection$$1, k) {
    zoom.transform(selection$$1, function() {
      var e = extent.apply(this, arguments),
          t0 = this.__zoom,
          p0 = centroid(e),
          p1 = t0.invert(p0),
          k1 = typeof k === "function" ? k.apply(this, arguments) : k;
      return constrain(translate(scale(t0, k1), p0, p1), e);
    });
  };

  zoom.translateBy = function(selection$$1, x, y) {
    zoom.transform(selection$$1, function() {
      return constrain(this.__zoom.translate(
        typeof x === "function" ? x.apply(this, arguments) : x,
        typeof y === "function" ? y.apply(this, arguments) : y
      ), extent.apply(this, arguments));
    });
  };

  zoom.translateTo = function(selection$$1, x, y) {
    zoom.transform(selection$$1, function() {
      var e = extent.apply(this, arguments),
          t = this.__zoom,
          p = centroid(e);
      return constrain(identity$9.translate(p[0], p[1]).scale(t.k).translate(
        typeof x === "function" ? -x.apply(this, arguments) : -x,
        typeof y === "function" ? -y.apply(this, arguments) : -y
      ), e);
    });
  };

  function scale(transform, k) {
    k = Math.max(k0, Math.min(k1, k));
    return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
  }

  function translate(transform, p0, p1) {
    var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
    return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
  }

  function constrain(transform, extent) {
    var dx0 = transform.invertX(extent[0][0]) - x0,
        dx1 = transform.invertX(extent[1][0]) - x1,
        dy0 = transform.invertY(extent[0][1]) - y0,
        dy1 = transform.invertY(extent[1][1]) - y1;
    return transform.translate(
      dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
      dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
    );
  }

  function centroid(extent) {
    return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
  }

  function schedule(transition$$1, transform, center) {
    transition$$1
        .on("start.zoom", function() { gesture(this, arguments).start(); })
        .on("interrupt.zoom end.zoom", function() { gesture(this, arguments).end(); })
        .tween("zoom", function() {
          var that = this,
              args = arguments,
              g = gesture(that, args),
              e = extent.apply(that, args),
              p = center || centroid(e),
              w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
              a = that.__zoom,
              b = typeof transform === "function" ? transform.apply(that, args) : transform,
              i = interpolate$$1(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
          return function(t) {
            if (t === 1) t = b; // Avoid rounding error on end.
            else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
            g.zoom(null, t);
          };
        });
  }

  function gesture(that, args) {
    for (var i = 0, n = gestures.length, g; i < n; ++i) {
      if ((g = gestures[i]).that === that) {
        return g;
      }
    }
    return new Gesture(that, args);
  }

  function Gesture(that, args) {
    this.that = that;
    this.args = args;
    this.index = -1;
    this.active = 0;
    this.extent = extent.apply(that, args);
  }

  Gesture.prototype = {
    start: function() {
      if (++this.active === 1) {
        this.index = gestures.push(this) - 1;
        this.emit("start");
      }
      return this;
    },
    zoom: function(key, transform) {
      if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
      if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
      if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
      this.that.__zoom = transform;
      this.emit("zoom");
      return this;
    },
    end: function() {
      if (--this.active === 0) {
        gestures.splice(this.index, 1);
        this.index = -1;
        this.emit("end");
      }
      return this;
    },
    emit: function(type) {
      customEvent(new ZoomEvent(zoom, type, this.that.__zoom), listeners.apply, listeners, [type, this.that, this.args]);
    }
  };

  function wheeled() {
    if (!filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        t = this.__zoom,
        k = Math.max(k0, Math.min(k1, t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
        p = mouse(this);

    // If the mouse is in the same location as before, reuse it.
    // If there were recent wheel events, reset the wheel idle timeout.
    if (g.wheel) {
      if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
        g.mouse[1] = t.invert(g.mouse[0] = p);
      }
      clearTimeout(g.wheel);
    }

    // If this wheel event won’t trigger a transform change, ignore it.
    else if (t.k === k) return;

    // Otherwise, capture the mouse point and location at the start.
    else {
      g.mouse = [p, t.invert(p)];
      interrupt(this);
      g.start();
    }

    noevent$2();
    g.wheel = setTimeout(wheelidled, wheelDelay);
    g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent));

    function wheelidled() {
      g.wheel = null;
      g.end();
    }
  }

  function mousedowned() {
    if (touchending || !filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        v = select(exports.event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
        p = mouse(this),
        x0 = exports.event.clientX,
        y0 = exports.event.clientY;

    dragDisable(exports.event.view);
    nopropagation$2();
    g.mouse = [p, this.__zoom.invert(p)];
    interrupt(this);
    g.start();

    function mousemoved() {
      noevent$2();
      if (!g.moved) {
        var dx = exports.event.clientX - x0, dy = exports.event.clientY - y0;
        g.moved = dx * dx + dy * dy > clickDistance2;
      }
      g.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = mouse(g.that), g.mouse[1]), g.extent));
    }

    function mouseupped() {
      v.on("mousemove.zoom mouseup.zoom", null);
      yesdrag(exports.event.view, g.moved);
      noevent$2();
      g.end();
    }
  }

  function dblclicked() {
    if (!filter.apply(this, arguments)) return;
    var t0 = this.__zoom,
        p0 = mouse(this),
        p1 = t0.invert(p0),
        k1 = t0.k * (exports.event.shiftKey ? 0.5 : 2),
        t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, arguments));

    noevent$2();
    if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0);
    else select(this).call(zoom.transform, t1);
  }

  function touchstarted() {
    if (!filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        touches$$1 = exports.event.changedTouches,
        started,
        n = touches$$1.length, i, t, p;

    nopropagation$2();
    for (i = 0; i < n; ++i) {
      t = touches$$1[i], p = touch(this, touches$$1, t.identifier);
      p = [p, this.__zoom.invert(p), t.identifier];
      if (!g.touch0) g.touch0 = p, started = true;
      else if (!g.touch1) g.touch1 = p;
    }

    // If this is a dbltap, reroute to the (optional) dblclick.zoom handler.
    if (touchstarting) {
      touchstarting = clearTimeout(touchstarting);
      if (!g.touch1) {
        g.end();
        p = select(this).on("dblclick.zoom");
        if (p) p.apply(this, arguments);
        return;
      }
    }

    if (started) {
      touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay);
      interrupt(this);
      g.start();
    }
  }

  function touchmoved() {
    var g = gesture(this, arguments),
        touches$$1 = exports.event.changedTouches,
        n = touches$$1.length, i, t, p, l;

    noevent$2();
    if (touchstarting) touchstarting = clearTimeout(touchstarting);
    for (i = 0; i < n; ++i) {
      t = touches$$1[i], p = touch(this, touches$$1, t.identifier);
      if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
      else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
    }
    t = g.that.__zoom;
    if (g.touch1) {
      var p0 = g.touch0[0], l0 = g.touch0[1],
          p1 = g.touch1[0], l1 = g.touch1[1],
          dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
          dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
      t = scale(t, Math.sqrt(dp / dl));
      p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
      l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
    }
    else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
    else return;
    g.zoom("touch", constrain(translate(t, p, l), g.extent));
  }

  function touchended() {
    var g = gesture(this, arguments),
        touches$$1 = exports.event.changedTouches,
        n = touches$$1.length, i, t;

    nopropagation$2();
    if (touchending) clearTimeout(touchending);
    touchending = setTimeout(function() { touchending = null; }, touchDelay);
    for (i = 0; i < n; ++i) {
      t = touches$$1[i];
      if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
      else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
    }
    if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
    if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]);
    else g.end();
  }

  zoom.wheelDelta = function(_) {
    return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant$13(+_), zoom) : wheelDelta;
  };

  zoom.filter = function(_) {
    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$13(!!_), zoom) : filter;
  };

  zoom.extent = function(_) {
    return arguments.length ? (extent = typeof _ === "function" ? _ : constant$13([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
  };

  zoom.scaleExtent = function(_) {
    return arguments.length ? (k0 = +_[0], k1 = +_[1], zoom) : [k0, k1];
  };

  zoom.translateExtent = function(_) {
    return arguments.length ? (x0 = +_[0][0], x1 = +_[1][0], y0 = +_[0][1], y1 = +_[1][1], zoom) : [[x0, y0], [x1, y1]];
  };

  zoom.duration = function(_) {
    return arguments.length ? (duration = +_, zoom) : duration;
  };

  zoom.interpolate = function(_) {
    return arguments.length ? (interpolate$$1 = _, zoom) : interpolate$$1;
  };

  zoom.on = function() {
    var value = listeners.on.apply(listeners, arguments);
    return value === listeners ? zoom : value;
  };

  zoom.clickDistance = function(_) {
    return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
  };

  return zoom;
};

var translateSelection = function(xy, dim) {
  var node = this.node()
  return !node ? this : node.getBBox ?
    this.attr('transform', function(d,i) {
      var p = typeof xy == 'function' ? xy.call(this, d,i) : xy;
      if (dim === 0) p = [p, 0]; else if (dim === 1) p = [0, p];
      return 'translate(' + p[0] +','+ p[1]+')';
    }) :
    this.style('transform', function(d,i) {
      var p = typeof xy == 'function' ? xy.call(this, d,i) : xy;
      if (dim === 0) p = [p, 0]; else if (dim === 1) p = [0, p];
      return 'translate(' + p[0] +'px,'+ p[1]+'px)';
    });
};

var parseAttributes = function(name) {
  if (typeof name === "string") {
    var attr = {},
      parts = name.split(/([\.#])/g), p;
      name = parts.shift();
    while ((p = parts.shift())) {
      if (p == '.') attr['class'] = attr['class'] ? attr['class'] + ' ' + parts.shift() : parts.shift();
      else if (p == '#') attr.id = parts.shift();
    }
    return {tag: name, attr: attr};
  }
  return name;
};

var append = function(name) {
  var create, n;

  if (typeof name === "function"){
    create = name;
  } else {
    n = parseAttributes(name);
    create = creator(n.tag);
  }
  var sel = this.select(function(){
    return this.appendChild(create.apply(this, arguments));
  });

  if (n) for (var key in n.attr) { sel.attr(key, n.attr[key]); }
  return sel;
};

function constantNull$1() {
  return null;
}

var insert = function(name, before) {
  var n = parseAttributes(name),
      create = creator(n.tag),
      select$$1 = before == null ? constantNull$1 : typeof before === "function" ? before : selector(before);

  var s = this.select(function() {
    return this.insertBefore(create.apply(this, arguments), select$$1.apply(this, arguments) || null);
  });


  //attrs not provided by default in v4
  for (var key in n.attr) { s.attr(key, n.attr[key]); }
  return s;
};

var parent = function() {
  var parents = [];
  return this.filter(function() {
    if (parents.indexOf(this.parentNode) > -1) return false;
    parents.push(this.parentNode);
    return true;
  }).select(function() {
    return this.parentNode;
  });
};

var selectAppend = function(name) {
  var select$$1 = selector(name),
     n = parseAttributes(name), s;

  name = creator(n.tag);

  s = this.select(function() {
    return select$$1.apply(this, arguments) ||
        this.appendChild(name.apply(this, arguments));
  });

  //attrs not provided by default in v4
  for (var key in n.attr) { s.attr(key, n.attr[key]); }
  return s;
};

var tspans = function(lines, lh) {
  return this.selectAll('tspan')
      .data(function(d) {
        return (typeof(lines) == 'function' ? lines(d) : lines)
          .map(function(l) {
            return { line: l, parent: d };
          });
      })
      .enter()
    .append('tspan')
      .text(function(d) { return d.line; })
      .attr('x', 0)
      .attr('dy', function(d, i) { return i ? (typeof(lh) == 'function' ? lh(d.parent, d.line, i) : lh) || 15 : 0; });
};

var appendMany = function(name, data){
  if (typeof(data) == 'string'){
    console.warn("DEPRECATED: jetpack's appendMany order of arguments has changed. It's appendMany('div', data) from now on");
    var temp = data;
    data = name;
    name = temp;
  }

  return this.selectAll(null).data(data).enter().append(name);
};

var at = function(name, value) {
  if (typeof(name) == 'object'){
    for (var key in name){
      this.attr(key.replace(/([a-z\d])([A-Z])/g, '$1-$2').toLowerCase(), name[key]);
    }
    return this;
  } else{
    return arguments.length == 1 ? this.attr(name) : this.attr(name, value);
  }
};

function f(){
  var functions = arguments;
  
  //convert all string arguments into field accessors
  var i = 0, l = functions.length;
  while (i < l) {
    if (typeof(functions[i]) === 'string' || typeof(functions[i]) === 'number'){
      functions[i] = (function(str){ return function(d){ return d[str]; }; })(functions[i]);
    }
    i++;
  }

   //return composition of functions
  return function(d) {
    var i=0, l = functions.length;
    while (i++ < l) d = functions[i-1].call(this, d);
    return d;
  };
}

f.not = function(d){ return !d; };
f.run = function(d){ return d(); };
f.objToFn = function(obj, defaultVal){
  if (arguments.length == 1) defaultVal = undefined;

  return function(str){
    return typeof(obj[str]) !== undefined ? obj[str] : defaultVal;
  };
};

var st = function(name, value) {
  if (typeof(name) == 'object'){
    for (var key in name){
      addStyle(this, key, name[key]);
    }
    return this;
  } else {
    return arguments.length == 1 ? this.style(name) : addStyle(this, name, value);
  }


  function addStyle(sel, style, value){
    style = style.replace(/([a-z\d])([A-Z])/g, '$1-$2').toLowerCase();

    var pxStyles = 'top left bottom right padding-top padding-left padding-bottom padding-right border-top b-width border-left-width border-botto-width m border-right-width  margin-top margin-left margin-bottom margin-right font-size width height stroke-width line-height margin padding border border-radius max-width min-width';

    if (~pxStyles.indexOf(style) ){
      sel.style(style, typeof value == 'function' ? wrapPx(value) : addPx(value));
    } else{
      sel.style(style, value);
    }

    return sel;
  } 

  function addPx(d){ return d.match ? d : d + 'px'; }
  function wrapPx(fn){
    return function(){
      var val = fn.apply(this, arguments);
      return addPx(val)
    }

  }
};

// while this might not be reprentative for all fonts, it is
// still better than assuming every character has the same width
// (set monospace=true if you want to bypass this)
var CHAR_W = {
    A:7,a:7,B:8,b:7,C:8,c:6,D:9,d:7,E:7,e:7,F:7,f:4,G:9,g:7,H:9,h:7,I:3,i:3,J:5,j:3,K:8,k:6,L:7,l:3,M:11,
    m:11,N:9,n:7,O:9,o:7,P:8,p:7,Q:9,q:7,R:8,r:4,S:8,s:6,T:7,t:4,U:9,u:7,V:7,v:6,W:11,w:9,X:7,x:6,Y:7,y:6,Z:7,z:5,
    '.':2,',':2,':':2,';':2
};

var wordwrap = function(line, maxCharactersPerLine, minCharactersPerLine, monospace) {
    var l, lines = [], w = [], words = [], w1, maxChars, minChars, maxLineW, minLineW;
    w1 = line.split(' ');
    w1.forEach(function(s, i) {
        var w2 = s.split('-');
        if (w2.length > 1) {
            w2.forEach(function(t, j) {
                w.push(t + (j < w2.length - 1 ? '-' : ''));
            });
        } else {
            w.push(s + (i < w1.length - 1 ? ' ' : ''));
        }
    });
    maxChars = maxCharactersPerLine || 40;
    minChars = minCharactersPerLine || Math.max(3, Math.min(maxChars * 0.5, 0.75 * w.map(word_len).sort(num_asc)[Math.round(w.length / 2)]));
    maxLineW = maxChars * CHAR_W.a;
    minLineW = minChars * CHAR_W.a;
    l = 0;
    w.forEach(function(d) {
        var ww = sum$1(d.split('').map(char_w));
        if (l + ww > maxLineW && l > minLineW) {
            lines.push(words.join(''));
            words.length = 0;
            l = 0;
        }
        l += ww;
        return words.push(d);
    });
    if (words.length) {
        lines.push(words.join(''));
    }
    return lines.filter(function(d) {
        return d !== '';
    });
    function char_w(c) { return !monospace && CHAR_W[c] || CHAR_W.a; }
    function word_len(d) { return d.length; }
    function num_asc(a, b) { return a - b; }
};

var ascendingKey = function(key) {
  return typeof key == 'function' ? function (a, b) {
    return key(a) < key(b) ? -1 : key(a) > key(b) ? 1 : key(a) >= key(b) ? 0 : NaN;
  } : function (a, b) {
    return a[key] < b[key] ? -1 : a[key] > b[key] ? 1 : a[key] >= b[key] ? 0 : NaN;
  };
};

var descendingKey = function(key) {
  return typeof key == 'function' ? function (a, b) {
    return key(b) < key(a) ? -1 : key(b) > key(a) ? 1 : key(b) >= key(a) ? 0 : NaN;
  } : function (a, b) {
    return b[key] < a[key] ? -1 : b[key] > a[key] ? 1 : b[key] >= a[key] ? 0 : NaN;
  };
};

var conventions = function(c){
  c = c || {};

  c.margin = c.margin || {}
  ;['top', 'right', 'bottom', 'left'].forEach(function(d){
    if (!c.margin[d] && c.margin[d] !== 0) c.margin[d] = 20 ;
  });

  if (c.parentSel) c.sel = c.parentSel; // backwords comp
  var node = c.sel && c.sel.node();

  c.totalWidth  = c.totalWidth  || node && node.offsetWidth  || 960;
  c.totalHeight = c.totalHeight || node && node.offsetHeight || 500;

  c.width  = c.width  || c.totalWidth  - c.margin.left - c.margin.right;
  c.height = c.height || c.totalHeight - c.margin.top - c.margin.bottom;

  c.totalWidth = c.width + c.margin.left + c.margin.right;
  c.totalHeight = c.height + c.margin.top + c.margin.bottom;

  c.sel = c.sel || select('body');
  c.sel.st({position: 'relative', height: c.totalHeight, width: c.totalWidth});

  c.x = c.x || linear$2().range([0, c.width]);
  c.y = c.y || linear$2().range([c.height, 0]);

  c.xAxis = c.xAxis || axisBottom().scale(c.x);
  c.yAxis = c.yAxis || axisLeft().scale(c.y);

  c.layers = (c.layers || 's').split('').map(function(type){
    var layer;
    if (type == 's'){
      layer = c.sel.append('svg')
          .st({position: 'absolute'})
          .attr('width', c.totalWidth)
          .attr('height', c.totalHeight)
        .append('g')
          .attr('transform', 'translate(' + c.margin.left + ',' + c.margin.top + ')');

      if (!c.svg) c.svg = layer; // defaults to lowest svg layer 
    } else if (type == 'c'){
      var s = window.devicePixelRatio || 1;

      layer = c.sel.append('canvas')
        .at({width: c.totalWidth*s, height: c.totalHeight*s})
        .st({width: c.totalWidth,   height: c.totalHeight})
        .st({position: 'absolute'})
        .node().getContext('2d');
      layer.scale(s, s);
      layer.translate(c.margin.left, c.margin.top);
    } else if (type == 'd'){
      layer = c.sel.append('div')
        .st({
          position: 'absolute', 
          left: c.margin.left,
          top: c.margin.top,
          width: c.width,
          height: c.height
        });
    }

    return layer
  });

  return c;
};

var drawAxis = function(c){
  var xAxisSel = c.svg.append('g')
      .attr('class', 'x axis')
      .attr('transform', 'translate(0,' + c.height + ')')
      .call(c.xAxis);

  var yAxisSel = c.svg.append('g')
      .attr('class', 'y axis')
      .call(c.yAxis);

  return {xAxisSel: xAxisSel, yAxisSel: yAxisSel}
};

var clamp = function(min, d, max) {
  return Math.max(min, Math.min(max, d))
};

var attachTooltip = function(sel, tooltipSel, fieldFns){
  if (!sel.size()) return;

  tooltipSel = tooltipSel || select('.tooltip');

  sel 
      .on('mouseover.attachTooltip', ttDisplay)
      .on('mousemove.attachTooltip', ttMove)
      .on('mouseout.attachTooltip',  ttHide)
      .on('click.attachTooltip', function(d){ console.log(d); });

  var d = sel.datum();
  fieldFns = fieldFns || d3keys(d)
      .filter(function(str){
        return (typeof d[str] != 'object') && (d[str] != 'array');
      })
      .map(function(str){
        return function(d){ return str + ': <b>' + d[str] + '</b>'; };
      });

  function ttDisplay(d){
    tooltipSel
        .classed('tooltip-hidden', false)
        .html('')
      .appendMany('div', fieldFns)
        .html(function(fn){ return fn(d); });

    select(this).classed('tooltipped', true);
  }

  function ttMove(d){
    if (!tooltipSel.size()) return;

    var e = exports.event,
        x = e.clientX,
        y = e.clientY,
        bb = tooltipSel.node().getBoundingClientRect(),
        left = clamp(20, (x-bb.width/2), window.innerWidth - bb.width - 20),
        top = innerHeight > y + 20 + bb.height ? y + 20 : y - bb.height - 20;

    tooltipSel
      .style('left', left +'px')
      .style('top', top + 'px');
  }

  function ttHide(d){
    tooltipSel.classed('tooltip-hidden', true);

    selectAll('.tooltipped').classed('tooltipped', false);
  }
};

var loadData = function(){
  var q = queue();
  
  var args = [].slice.call(arguments);
  var files = args.slice(0, args.length - 1);
  var cb = args[args.length - 1];

  files.forEach(function(d){
    var type = d.split('?')[0].split('.').reverse()[0];

    var loadFn = {csv: csv$1, tsv: tsv$1, json: json}[type];
    if (!loadFn) return cb(new Error('Invalid type', d));
    q.defer(loadFn, d) ;
  });
  q.awaitAll(cb);
};

var nestBy = function(array, key){
  return nest().key(key).entries(array).map(function(d){
    d.values.key = d.key;
    return d.values;
  });
};

var round = function(n, p) {
  return p ? Math.round(n * (p = Math.pow(10, p))) / p : Math.round(n);
};

// Clips the specified subject polygon to the specified clip polygon;
// requires the clip polygon to be counterclockwise and convex.
// https://en.wikipedia.org/wiki/Sutherland–Hodgman_algorithm
var polygonClip = function(clip, subject) {
  var input,
      closed = polygonClosed(subject),
      i = -1,
      n = clip.length - polygonClosed(clip),
      j,
      m,
      a = clip[n - 1],
    b,
    c,
    d;

  while (++i < n) {
    input = subject.slice();
    subject.length = 0;
    b = clip[i];
    c = input[(m = input.length - closed) - 1];
    j = -1;
    while (++j < m) {
      d = input[j];
      if (polygonInside(d, a, b)) {
        if (!polygonInside(c, a, b)) {
          subject.push(polygonIntersect(c, d, a, b));
        }
        subject.push(d);
      } else if (polygonInside(c, a, b)) {
        subject.push(polygonIntersect(c, d, a, b));
      }
      c = d;
    }
    if (closed) subject.push(subject[0]);
    a = b;
  }

  return subject;
};

function polygonInside(p, a, b) {
  return (b[0] - a[0]) * (p[1] - a[1]) < (b[1] - a[1]) * (p[0] - a[0]);
}

// Intersect two infinite lines cd and ab.
function polygonIntersect(c, d, a, b) {
  var x1 = c[0], x3 = a[0], x21 = d[0] - x1, x43 = b[0] - x3,
      y1 = c[1], y3 = a[1], y21 = d[1] - y1, y43 = b[1] - y3,
      ua = (x43 * (y1 - y3) - y43 * (x1 - x3)) / (y43 * x21 - x43 * y21);
  return [x1 + ua * x21, y1 + ua * y21];
}

// Returns true if the polygon is closed.
function polygonClosed(coordinates) {
  var a = coordinates[0],
      b = coordinates[coordinates.length - 1];
  return !(a[0] - b[0] || a[1] - b[1]);
}

selection.prototype.translate = translateSelection;
transition.prototype.translate = translateSelection;
selection.prototype.append = append;
selection.prototype.insert = insert;
selection.prototype.parent = parent;
selection.prototype.selectAppend = selectAppend;
selection.prototype.tspans = tspans;
selection.prototype.appendMany = appendMany;
selection.prototype.at = at;
selection.prototype.st = st;
transition.prototype.at = at;
transition.prototype.st = st;
selection.prototype.prop = selection.prototype.property;

var colors$1 = function(specifier) {
  var n = specifier.length / 6 | 0, colors = new Array(n), i = 0;
  while (i < n) colors[i] = "#" + specifier.slice(i * 6, ++i * 6);
  return colors;
};

var Accent = colors$1("7fc97fbeaed4fdc086ffff99386cb0f0027fbf5b17666666");

var Dark2 = colors$1("1b9e77d95f027570b3e7298a66a61ee6ab02a6761d666666");

var Paired = colors$1("a6cee31f78b4b2df8a33a02cfb9a99e31a1cfdbf6fff7f00cab2d66a3d9affff99b15928");

var Pastel1 = colors$1("fbb4aeb3cde3ccebc5decbe4fed9a6ffffcce5d8bdfddaecf2f2f2");

var Pastel2 = colors$1("b3e2cdfdcdaccbd5e8f4cae4e6f5c9fff2aef1e2cccccccc");

var Set1 = colors$1("e41a1c377eb84daf4a984ea3ff7f00ffff33a65628f781bf999999");

var Set2 = colors$1("66c2a5fc8d628da0cbe78ac3a6d854ffd92fe5c494b3b3b3");

var Set3 = colors$1("8dd3c7ffffb3bebadafb807280b1d3fdb462b3de69fccde5d9d9d9bc80bdccebc5ffed6f");

var ramp$1 = function(scheme) {
  return rgbBasis(scheme[scheme.length - 1]);
};

var scheme = new Array(3).concat(
  "d8b365f5f5f55ab4ac",
  "a6611adfc27d80cdc1018571",
  "a6611adfc27df5f5f580cdc1018571",
  "8c510ad8b365f6e8c3c7eae55ab4ac01665e",
  "8c510ad8b365f6e8c3f5f5f5c7eae55ab4ac01665e",
  "8c510abf812ddfc27df6e8c3c7eae580cdc135978f01665e",
  "8c510abf812ddfc27df6e8c3f5f5f5c7eae580cdc135978f01665e",
  "5430058c510abf812ddfc27df6e8c3c7eae580cdc135978f01665e003c30",
  "5430058c510abf812ddfc27df6e8c3f5f5f5c7eae580cdc135978f01665e003c30"
).map(colors$1);

var BrBG = ramp$1(scheme);

var scheme$1 = new Array(3).concat(
  "af8dc3f7f7f77fbf7b",
  "7b3294c2a5cfa6dba0008837",
  "7b3294c2a5cff7f7f7a6dba0008837",
  "762a83af8dc3e7d4e8d9f0d37fbf7b1b7837",
  "762a83af8dc3e7d4e8f7f7f7d9f0d37fbf7b1b7837",
  "762a839970abc2a5cfe7d4e8d9f0d3a6dba05aae611b7837",
  "762a839970abc2a5cfe7d4e8f7f7f7d9f0d3a6dba05aae611b7837",
  "40004b762a839970abc2a5cfe7d4e8d9f0d3a6dba05aae611b783700441b",
  "40004b762a839970abc2a5cfe7d4e8f7f7f7d9f0d3a6dba05aae611b783700441b"
).map(colors$1);

var PRGn = ramp$1(scheme$1);

var scheme$2 = new Array(3).concat(
  "e9a3c9f7f7f7a1d76a",
  "d01c8bf1b6dab8e1864dac26",
  "d01c8bf1b6daf7f7f7b8e1864dac26",
  "c51b7de9a3c9fde0efe6f5d0a1d76a4d9221",
  "c51b7de9a3c9fde0eff7f7f7e6f5d0a1d76a4d9221",
  "c51b7dde77aef1b6dafde0efe6f5d0b8e1867fbc414d9221",
  "c51b7dde77aef1b6dafde0eff7f7f7e6f5d0b8e1867fbc414d9221",
  "8e0152c51b7dde77aef1b6dafde0efe6f5d0b8e1867fbc414d9221276419",
  "8e0152c51b7dde77aef1b6dafde0eff7f7f7e6f5d0b8e1867fbc414d9221276419"
).map(colors$1);

var PiYG = ramp$1(scheme$2);

var scheme$3 = new Array(3).concat(
  "998ec3f7f7f7f1a340",
  "5e3c99b2abd2fdb863e66101",
  "5e3c99b2abd2f7f7f7fdb863e66101",
  "542788998ec3d8daebfee0b6f1a340b35806",
  "542788998ec3d8daebf7f7f7fee0b6f1a340b35806",
  "5427888073acb2abd2d8daebfee0b6fdb863e08214b35806",
  "5427888073acb2abd2d8daebf7f7f7fee0b6fdb863e08214b35806",
  "2d004b5427888073acb2abd2d8daebfee0b6fdb863e08214b358067f3b08",
  "2d004b5427888073acb2abd2d8daebf7f7f7fee0b6fdb863e08214b358067f3b08"
).map(colors$1);

var PuOr = ramp$1(scheme$3);

var scheme$4 = new Array(3).concat(
  "ef8a62f7f7f767a9cf",
  "ca0020f4a58292c5de0571b0",
  "ca0020f4a582f7f7f792c5de0571b0",
  "b2182bef8a62fddbc7d1e5f067a9cf2166ac",
  "b2182bef8a62fddbc7f7f7f7d1e5f067a9cf2166ac",
  "b2182bd6604df4a582fddbc7d1e5f092c5de4393c32166ac",
  "b2182bd6604df4a582fddbc7f7f7f7d1e5f092c5de4393c32166ac",
  "67001fb2182bd6604df4a582fddbc7d1e5f092c5de4393c32166ac053061",
  "67001fb2182bd6604df4a582fddbc7f7f7f7d1e5f092c5de4393c32166ac053061"
).map(colors$1);

var RdBu = ramp$1(scheme$4);

var scheme$5 = new Array(3).concat(
  "ef8a62ffffff999999",
  "ca0020f4a582bababa404040",
  "ca0020f4a582ffffffbababa404040",
  "b2182bef8a62fddbc7e0e0e09999994d4d4d",
  "b2182bef8a62fddbc7ffffffe0e0e09999994d4d4d",
  "b2182bd6604df4a582fddbc7e0e0e0bababa8787874d4d4d",
  "b2182bd6604df4a582fddbc7ffffffe0e0e0bababa8787874d4d4d",
  "67001fb2182bd6604df4a582fddbc7e0e0e0bababa8787874d4d4d1a1a1a",
  "67001fb2182bd6604df4a582fddbc7ffffffe0e0e0bababa8787874d4d4d1a1a1a"
).map(colors$1);

var RdGy = ramp$1(scheme$5);

var scheme$6 = new Array(3).concat(
  "fc8d59ffffbf91bfdb",
  "d7191cfdae61abd9e92c7bb6",
  "d7191cfdae61ffffbfabd9e92c7bb6",
  "d73027fc8d59fee090e0f3f891bfdb4575b4",
  "d73027fc8d59fee090ffffbfe0f3f891bfdb4575b4",
  "d73027f46d43fdae61fee090e0f3f8abd9e974add14575b4",
  "d73027f46d43fdae61fee090ffffbfe0f3f8abd9e974add14575b4",
  "a50026d73027f46d43fdae61fee090e0f3f8abd9e974add14575b4313695",
  "a50026d73027f46d43fdae61fee090ffffbfe0f3f8abd9e974add14575b4313695"
).map(colors$1);

var RdYlBu = ramp$1(scheme$6);

var scheme$7 = new Array(3).concat(
  "fc8d59ffffbf91cf60",
  "d7191cfdae61a6d96a1a9641",
  "d7191cfdae61ffffbfa6d96a1a9641",
  "d73027fc8d59fee08bd9ef8b91cf601a9850",
  "d73027fc8d59fee08bffffbfd9ef8b91cf601a9850",
  "d73027f46d43fdae61fee08bd9ef8ba6d96a66bd631a9850",
  "d73027f46d43fdae61fee08bffffbfd9ef8ba6d96a66bd631a9850",
  "a50026d73027f46d43fdae61fee08bd9ef8ba6d96a66bd631a9850006837",
  "a50026d73027f46d43fdae61fee08bffffbfd9ef8ba6d96a66bd631a9850006837"
).map(colors$1);

var RdYlGn = ramp$1(scheme$7);

var scheme$8 = new Array(3).concat(
  "fc8d59ffffbf99d594",
  "d7191cfdae61abdda42b83ba",
  "d7191cfdae61ffffbfabdda42b83ba",
  "d53e4ffc8d59fee08be6f59899d5943288bd",
  "d53e4ffc8d59fee08bffffbfe6f59899d5943288bd",
  "d53e4ff46d43fdae61fee08be6f598abdda466c2a53288bd",
  "d53e4ff46d43fdae61fee08bffffbfe6f598abdda466c2a53288bd",
  "9e0142d53e4ff46d43fdae61fee08be6f598abdda466c2a53288bd5e4fa2",
  "9e0142d53e4ff46d43fdae61fee08bffffbfe6f598abdda466c2a53288bd5e4fa2"
).map(colors$1);

var Spectral = ramp$1(scheme$8);

var scheme$9 = new Array(3).concat(
  "e5f5f999d8c92ca25f",
  "edf8fbb2e2e266c2a4238b45",
  "edf8fbb2e2e266c2a42ca25f006d2c",
  "edf8fbccece699d8c966c2a42ca25f006d2c",
  "edf8fbccece699d8c966c2a441ae76238b45005824",
  "f7fcfde5f5f9ccece699d8c966c2a441ae76238b45005824",
  "f7fcfde5f5f9ccece699d8c966c2a441ae76238b45006d2c00441b"
).map(colors$1);

var BuGn = ramp$1(scheme$9);

var scheme$10 = new Array(3).concat(
  "e0ecf49ebcda8856a7",
  "edf8fbb3cde38c96c688419d",
  "edf8fbb3cde38c96c68856a7810f7c",
  "edf8fbbfd3e69ebcda8c96c68856a7810f7c",
  "edf8fbbfd3e69ebcda8c96c68c6bb188419d6e016b",
  "f7fcfde0ecf4bfd3e69ebcda8c96c68c6bb188419d6e016b",
  "f7fcfde0ecf4bfd3e69ebcda8c96c68c6bb188419d810f7c4d004b"
).map(colors$1);

var BuPu = ramp$1(scheme$10);

var scheme$11 = new Array(3).concat(
  "e0f3dba8ddb543a2ca",
  "f0f9e8bae4bc7bccc42b8cbe",
  "f0f9e8bae4bc7bccc443a2ca0868ac",
  "f0f9e8ccebc5a8ddb57bccc443a2ca0868ac",
  "f0f9e8ccebc5a8ddb57bccc44eb3d32b8cbe08589e",
  "f7fcf0e0f3dbccebc5a8ddb57bccc44eb3d32b8cbe08589e",
  "f7fcf0e0f3dbccebc5a8ddb57bccc44eb3d32b8cbe0868ac084081"
).map(colors$1);

var GnBu = ramp$1(scheme$11);

var scheme$12 = new Array(3).concat(
  "fee8c8fdbb84e34a33",
  "fef0d9fdcc8afc8d59d7301f",
  "fef0d9fdcc8afc8d59e34a33b30000",
  "fef0d9fdd49efdbb84fc8d59e34a33b30000",
  "fef0d9fdd49efdbb84fc8d59ef6548d7301f990000",
  "fff7ecfee8c8fdd49efdbb84fc8d59ef6548d7301f990000",
  "fff7ecfee8c8fdd49efdbb84fc8d59ef6548d7301fb300007f0000"
).map(colors$1);

var OrRd = ramp$1(scheme$12);

var scheme$13 = new Array(3).concat(
  "ece2f0a6bddb1c9099",
  "f6eff7bdc9e167a9cf02818a",
  "f6eff7bdc9e167a9cf1c9099016c59",
  "f6eff7d0d1e6a6bddb67a9cf1c9099016c59",
  "f6eff7d0d1e6a6bddb67a9cf3690c002818a016450",
  "fff7fbece2f0d0d1e6a6bddb67a9cf3690c002818a016450",
  "fff7fbece2f0d0d1e6a6bddb67a9cf3690c002818a016c59014636"
).map(colors$1);

var PuBuGn = ramp$1(scheme$13);

var scheme$14 = new Array(3).concat(
  "ece7f2a6bddb2b8cbe",
  "f1eef6bdc9e174a9cf0570b0",
  "f1eef6bdc9e174a9cf2b8cbe045a8d",
  "f1eef6d0d1e6a6bddb74a9cf2b8cbe045a8d",
  "f1eef6d0d1e6a6bddb74a9cf3690c00570b0034e7b",
  "fff7fbece7f2d0d1e6a6bddb74a9cf3690c00570b0034e7b",
  "fff7fbece7f2d0d1e6a6bddb74a9cf3690c00570b0045a8d023858"
).map(colors$1);

var PuBu = ramp$1(scheme$14);

var scheme$15 = new Array(3).concat(
  "e7e1efc994c7dd1c77",
  "f1eef6d7b5d8df65b0ce1256",
  "f1eef6d7b5d8df65b0dd1c77980043",
  "f1eef6d4b9dac994c7df65b0dd1c77980043",
  "f1eef6d4b9dac994c7df65b0e7298ace125691003f",
  "f7f4f9e7e1efd4b9dac994c7df65b0e7298ace125691003f",
  "f7f4f9e7e1efd4b9dac994c7df65b0e7298ace125698004367001f"
).map(colors$1);

var PuRd = ramp$1(scheme$15);

var scheme$16 = new Array(3).concat(
  "fde0ddfa9fb5c51b8a",
  "feebe2fbb4b9f768a1ae017e",
  "feebe2fbb4b9f768a1c51b8a7a0177",
  "feebe2fcc5c0fa9fb5f768a1c51b8a7a0177",
  "feebe2fcc5c0fa9fb5f768a1dd3497ae017e7a0177",
  "fff7f3fde0ddfcc5c0fa9fb5f768a1dd3497ae017e7a0177",
  "fff7f3fde0ddfcc5c0fa9fb5f768a1dd3497ae017e7a017749006a"
).map(colors$1);

var RdPu = ramp$1(scheme$16);

var scheme$17 = new Array(3).concat(
  "edf8b17fcdbb2c7fb8",
  "ffffcca1dab441b6c4225ea8",
  "ffffcca1dab441b6c42c7fb8253494",
  "ffffccc7e9b47fcdbb41b6c42c7fb8253494",
  "ffffccc7e9b47fcdbb41b6c41d91c0225ea80c2c84",
  "ffffd9edf8b1c7e9b47fcdbb41b6c41d91c0225ea80c2c84",
  "ffffd9edf8b1c7e9b47fcdbb41b6c41d91c0225ea8253494081d58"
).map(colors$1);

var YlGnBu = ramp$1(scheme$17);

var scheme$18 = new Array(3).concat(
  "f7fcb9addd8e31a354",
  "ffffccc2e69978c679238443",
  "ffffccc2e69978c67931a354006837",
  "ffffccd9f0a3addd8e78c67931a354006837",
  "ffffccd9f0a3addd8e78c67941ab5d238443005a32",
  "ffffe5f7fcb9d9f0a3addd8e78c67941ab5d238443005a32",
  "ffffe5f7fcb9d9f0a3addd8e78c67941ab5d238443006837004529"
).map(colors$1);

var YlGn = ramp$1(scheme$18);

var scheme$19 = new Array(3).concat(
  "fff7bcfec44fd95f0e",
  "ffffd4fed98efe9929cc4c02",
  "ffffd4fed98efe9929d95f0e993404",
  "ffffd4fee391fec44ffe9929d95f0e993404",
  "ffffd4fee391fec44ffe9929ec7014cc4c028c2d04",
  "ffffe5fff7bcfee391fec44ffe9929ec7014cc4c028c2d04",
  "ffffe5fff7bcfee391fec44ffe9929ec7014cc4c02993404662506"
).map(colors$1);

var YlOrBr = ramp$1(scheme$19);

var scheme$20 = new Array(3).concat(
  "ffeda0feb24cf03b20",
  "ffffb2fecc5cfd8d3ce31a1c",
  "ffffb2fecc5cfd8d3cf03b20bd0026",
  "ffffb2fed976feb24cfd8d3cf03b20bd0026",
  "ffffb2fed976feb24cfd8d3cfc4e2ae31a1cb10026",
  "ffffccffeda0fed976feb24cfd8d3cfc4e2ae31a1cb10026",
  "ffffccffeda0fed976feb24cfd8d3cfc4e2ae31a1cbd0026800026"
).map(colors$1);

var YlOrRd = ramp$1(scheme$20);

var scheme$21 = new Array(3).concat(
  "deebf79ecae13182bd",
  "eff3ffbdd7e76baed62171b5",
  "eff3ffbdd7e76baed63182bd08519c",
  "eff3ffc6dbef9ecae16baed63182bd08519c",
  "eff3ffc6dbef9ecae16baed64292c62171b5084594",
  "f7fbffdeebf7c6dbef9ecae16baed64292c62171b5084594",
  "f7fbffdeebf7c6dbef9ecae16baed64292c62171b508519c08306b"
).map(colors$1);

var Blues = ramp$1(scheme$21);

var scheme$22 = new Array(3).concat(
  "e5f5e0a1d99b31a354",
  "edf8e9bae4b374c476238b45",
  "edf8e9bae4b374c47631a354006d2c",
  "edf8e9c7e9c0a1d99b74c47631a354006d2c",
  "edf8e9c7e9c0a1d99b74c47641ab5d238b45005a32",
  "f7fcf5e5f5e0c7e9c0a1d99b74c47641ab5d238b45005a32",
  "f7fcf5e5f5e0c7e9c0a1d99b74c47641ab5d238b45006d2c00441b"
).map(colors$1);

var Greens = ramp$1(scheme$22);

var scheme$23 = new Array(3).concat(
  "f0f0f0bdbdbd636363",
  "f7f7f7cccccc969696525252",
  "f7f7f7cccccc969696636363252525",
  "f7f7f7d9d9d9bdbdbd969696636363252525",
  "f7f7f7d9d9d9bdbdbd969696737373525252252525",
  "fffffff0f0f0d9d9d9bdbdbd969696737373525252252525",
  "fffffff0f0f0d9d9d9bdbdbd969696737373525252252525000000"
).map(colors$1);

var Greys = ramp$1(scheme$23);

var scheme$24 = new Array(3).concat(
  "efedf5bcbddc756bb1",
  "f2f0f7cbc9e29e9ac86a51a3",
  "f2f0f7cbc9e29e9ac8756bb154278f",
  "f2f0f7dadaebbcbddc9e9ac8756bb154278f",
  "f2f0f7dadaebbcbddc9e9ac8807dba6a51a34a1486",
  "fcfbfdefedf5dadaebbcbddc9e9ac8807dba6a51a34a1486",
  "fcfbfdefedf5dadaebbcbddc9e9ac8807dba6a51a354278f3f007d"
).map(colors$1);

var Purples = ramp$1(scheme$24);

var scheme$25 = new Array(3).concat(
  "fee0d2fc9272de2d26",
  "fee5d9fcae91fb6a4acb181d",
  "fee5d9fcae91fb6a4ade2d26a50f15",
  "fee5d9fcbba1fc9272fb6a4ade2d26a50f15",
  "fee5d9fcbba1fc9272fb6a4aef3b2ccb181d99000d",
  "fff5f0fee0d2fcbba1fc9272fb6a4aef3b2ccb181d99000d",
  "fff5f0fee0d2fcbba1fc9272fb6a4aef3b2ccb181da50f1567000d"
).map(colors$1);

var Reds = ramp$1(scheme$25);

var scheme$26 = new Array(3).concat(
  "fee6cefdae6be6550d",
  "feeddefdbe85fd8d3cd94701",
  "feeddefdbe85fd8d3ce6550da63603",
  "feeddefdd0a2fdae6bfd8d3ce6550da63603",
  "feeddefdd0a2fdae6bfd8d3cf16913d948018c2d04",
  "fff5ebfee6cefdd0a2fdae6bfd8d3cf16913d948018c2d04",
  "fff5ebfee6cefdd0a2fdae6bfd8d3cf16913d94801a636037f2704"
).map(colors$1);

var Oranges = ramp$1(scheme$26);

// export {
//   geoNaturalEarth,
//   geoSatellite
// } from "d3-geo-projection"

// export * from "graph-scroll"

// change default dates
var nytLocale = {
  "dateTime": "%x, %X",
  "date": "%-m/%-d/%Y",
  "time": "%-I:%M:%S %p",
  "periods": ["AM", "PM"],
  "days": ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
  "shortDays": ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
  "months": ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
  "shortMonths": ["Jan.", "Feb.", "March", "April", "May", "June", "July", "Aug.", "Sept.", "Oct.", "Nov.", "Dec."]
};

defaultLocale$1(nytLocale);

exports.version = version;
exports.bisect = bisectRight;
exports.bisectRight = bisectRight;
exports.bisectLeft = bisectLeft;
exports.ascending = ascending;
exports.bisector = bisector;
exports.cross = cross;
exports.descending = descending;
exports.deviation = deviation;
exports.extent = extent;
exports.histogram = histogram;
exports.thresholdFreedmanDiaconis = freedmanDiaconis;
exports.thresholdScott = scott;
exports.thresholdSturges = sturges;
exports.max = max;
exports.mean = mean;
exports.median = median;
exports.merge = merge;
exports.min = min;
exports.pairs = pairs;
exports.permute = permute;
exports.quantile = quantile;
exports.range = range;
exports.scan = scan;
exports.shuffle = shuffle;
exports.sum = sum;
exports.ticks = ticks;
exports.tickIncrement = tickIncrement;
exports.tickStep = tickStep;
exports.transpose = transpose;
exports.variance = variance;
exports.zip = zip;
exports.axisTop = axisTop;
exports.axisRight = axisRight;
exports.axisBottom = axisBottom;
exports.axisLeft = axisLeft;
exports.brush = brush;
exports.brushX = brushX;
exports.brushY = brushY;
exports.brushSelection = brushSelection;
exports.chord = chord;
exports.ribbon = ribbon;
exports.nest = nest;
exports.set = set$2;
exports.map = map$2;
exports.keys = d3keys;
exports.values = values;
exports.entries = entries;
exports.color = color;
exports.rgb = rgb;
exports.hsl = hsl;
exports.lab = lab;
exports.hcl = hcl;
exports.cubehelix = cubehelix;
exports.dispatch = dispatch;
exports.drag = drag;
exports.dragDisable = dragDisable;
exports.dragEnable = yesdrag;
exports.dsvFormat = dsv;
exports.csvParse = csvParse;
exports.csvParseRows = csvParseRows;
exports.csvFormat = csvFormat;
exports.csvFormatRows = csvFormatRows;
exports.tsvParse = tsvParse;
exports.tsvParseRows = tsvParseRows;
exports.tsvFormat = tsvFormat;
exports.tsvFormatRows = tsvFormatRows;
exports.easeLinear = linear$1;
exports.easeQuad = quadInOut;
exports.easeQuadIn = quadIn;
exports.easeQuadOut = quadOut;
exports.easeQuadInOut = quadInOut;
exports.easeCubic = cubicInOut;
exports.easeCubicIn = cubicIn;
exports.easeCubicOut = cubicOut;
exports.easeCubicInOut = cubicInOut;
exports.easePoly = polyInOut;
exports.easePolyIn = polyIn;
exports.easePolyOut = polyOut;
exports.easePolyInOut = polyInOut;
exports.easeSin = sinInOut;
exports.easeSinIn = sinIn;
exports.easeSinOut = sinOut;
exports.easeSinInOut = sinInOut;
exports.easeExp = expInOut;
exports.easeExpIn = expIn;
exports.easeExpOut = expOut;
exports.easeExpInOut = expInOut;
exports.easeCircle = circleInOut;
exports.easeCircleIn = circleIn;
exports.easeCircleOut = circleOut;
exports.easeCircleInOut = circleInOut;
exports.easeBounce = bounceOut;
exports.easeBounceIn = bounceIn;
exports.easeBounceOut = bounceOut;
exports.easeBounceInOut = bounceInOut;
exports.easeBack = backInOut;
exports.easeBackIn = backIn;
exports.easeBackOut = backOut;
exports.easeBackInOut = backInOut;
exports.easeElastic = elasticOut;
exports.easeElasticIn = elasticIn;
exports.easeElasticOut = elasticOut;
exports.easeElasticInOut = elasticInOut;
exports.forceCenter = center$1;
exports.forceCollide = collide;
exports.forceLink = link;
exports.forceManyBody = manyBody;
exports.forceSimulation = simulation;
exports.forceX = x$2;
exports.forceY = y$2;
exports.formatDefaultLocale = defaultLocale;
exports.formatLocale = formatLocale;
exports.formatSpecifier = formatSpecifier;
exports.precisionFixed = precisionFixed;
exports.precisionPrefix = precisionPrefix;
exports.precisionRound = precisionRound;
exports.geoArea = area;
exports.geoBounds = bounds;
exports.geoCentroid = centroid;
exports.geoCircle = circle;
exports.geoClipExtent = extent$2;
exports.geoContains = contains;
exports.geoDistance = distance;
exports.geoGraticule = graticule;
exports.geoGraticule10 = graticule10;
exports.geoInterpolate = interpolate$1;
exports.geoLength = length$2;
exports.geoPath = index$1;
exports.geoAlbers = albers;
exports.geoAlbersUsa = albersUsa;
exports.geoAzimuthalEqualArea = azimuthalEqualArea;
exports.geoAzimuthalEqualAreaRaw = azimuthalEqualAreaRaw;
exports.geoAzimuthalEquidistant = azimuthalEquidistant;
exports.geoAzimuthalEquidistantRaw = azimuthalEquidistantRaw;
exports.geoConicConformal = conicConformal;
exports.geoConicConformalRaw = conicConformalRaw;
exports.geoConicEqualArea = conicEqualArea;
exports.geoConicEqualAreaRaw = conicEqualAreaRaw;
exports.geoConicEquidistant = conicEquidistant;
exports.geoConicEquidistantRaw = conicEquidistantRaw;
exports.geoEquirectangular = equirectangular;
exports.geoEquirectangularRaw = equirectangularRaw;
exports.geoGnomonic = gnomonic;
exports.geoGnomonicRaw = gnomonicRaw;
exports.geoIdentity = identity$6;
exports.geoProjection = projection;
exports.geoProjectionMutator = projectionMutator;
exports.geoMercator = mercator;
exports.geoMercatorRaw = mercatorRaw;
exports.geoOrthographic = orthographic;
exports.geoOrthographicRaw = orthographicRaw;
exports.geoStereographic = stereographic;
exports.geoStereographicRaw = stereographicRaw;
exports.geoTransverseMercator = transverseMercator;
exports.geoTransverseMercatorRaw = transverseMercatorRaw;
exports.geoRotation = rotation;
exports.geoStream = geoStream;
exports.geoTransform = transform;
exports.cluster = cluster;
exports.hierarchy = hierarchy;
exports.pack = index$2;
exports.packSiblings = siblings;
exports.packEnclose = enclose;
exports.partition = partition;
exports.stratify = stratify;
exports.tree = tree;
exports.treemap = index$3;
exports.treemapBinary = binary;
exports.treemapDice = treemapDice;
exports.treemapSlice = treemapSlice;
exports.treemapSliceDice = sliceDice;
exports.treemapSquarify = squarify;
exports.treemapResquarify = resquarify;
exports.interpolate = interpolateValue;
exports.interpolateArray = array$1;
exports.interpolateBasis = basis$1;
exports.interpolateBasisClosed = basisClosed;
exports.interpolateDate = date;
exports.interpolateNumber = reinterpolate;
exports.interpolateObject = object;
exports.interpolateRound = interpolateRound;
exports.interpolateString = interpolateString;
exports.interpolateTransformCss = interpolateTransformCss;
exports.interpolateTransformSvg = interpolateTransformSvg;
exports.interpolateZoom = interpolateZoom;
exports.interpolateRgb = interpolateRgb;
exports.interpolateRgbBasis = rgbBasis;
exports.interpolateRgbBasisClosed = rgbBasisClosed;
exports.interpolateHsl = hsl$2;
exports.interpolateHslLong = hslLong;
exports.interpolateLab = lab$1;
exports.interpolateHcl = hcl$2;
exports.interpolateHclLong = hclLong;
exports.interpolateCubehelix = cubehelix$2;
exports.interpolateCubehelixLong = cubehelixLong;
exports.quantize = quantize;
exports.path = path;
exports.polygonArea = area$1;
exports.polygonCentroid = centroid$1;
exports.polygonHull = hull;
exports.polygonContains = contains$1;
exports.polygonLength = length$3;
exports.quadtree = quadtree;
exports.queue = queue;
exports.randomUniform = uniform;
exports.randomNormal = normal;
exports.randomLogNormal = logNormal;
exports.randomBates = bates;
exports.randomIrwinHall = irwinHall;
exports.randomExponential = exponential$1;
exports.request = request;
exports.html = html;
exports.json = json;
exports.text = text;
exports.xml = xml;
exports.csv = csv$1;
exports.tsv = tsv$1;
exports.scaleBand = band;
exports.scalePoint = point$1;
exports.scaleIdentity = identity$7;
exports.scaleLinear = linear$2;
exports.scaleLog = log$1;
exports.scaleOrdinal = ordinal;
exports.scaleImplicit = implicit;
exports.scalePow = pow$1;
exports.scaleSqrt = sqrt$1;
exports.scaleQuantile = quantile$1;
exports.scaleQuantize = quantize$1;
exports.scaleThreshold = threshold$1;
exports.scaleTime = time;
exports.scaleUtc = utcTime;
exports.schemeCategory10 = category10;
exports.schemeCategory20b = category20b;
exports.schemeCategory20c = category20c;
exports.schemeCategory20 = category20;
exports.interpolateCubehelixDefault = cubehelix$3;
exports.interpolateRainbow = rainbow$1;
exports.interpolateWarm = warm;
exports.interpolateCool = cool;
exports.interpolateViridis = viridis;
exports.interpolateMagma = magma;
exports.interpolateInferno = inferno;
exports.interpolatePlasma = plasma;
exports.scaleSequential = sequential;
exports.creator = creator;
exports.local = local$1;
exports.matcher = matcher$1;
exports.mouse = mouse;
exports.namespace = namespace;
exports.namespaces = namespaces;
exports.select = select;
exports.selectAll = selectAll;
exports.selection = selection;
exports.selector = selector;
exports.selectorAll = selectorAll;
exports.style = styleValue;
exports.touch = touch;
exports.touches = touches;
exports.window = defaultView;
exports.customEvent = customEvent;
exports.arc = arc;
exports.area = area$2;
exports.line = line;
exports.pie = pie;
exports.areaRadial = areaRadial;
exports.radialArea = areaRadial;
exports.lineRadial = lineRadial$1;
exports.radialLine = lineRadial$1;
exports.pointRadial = pointRadial;
exports.linkHorizontal = linkHorizontal;
exports.linkVertical = linkVertical;
exports.linkRadial = linkRadial;
exports.symbol = symbol;
exports.symbols = symbols;
exports.symbolCircle = circle$2;
exports.symbolCross = cross$3;
exports.symbolDiamond = diamond;
exports.symbolSquare = square;
exports.symbolStar = star;
exports.symbolTriangle = triangle;
exports.symbolWye = wye;
exports.curveBasisClosed = basisClosed$1;
exports.curveBasisOpen = basisOpen;
exports.curveBasis = basis$2;
exports.curveBundle = bundle;
exports.curveCardinalClosed = cardinalClosed;
exports.curveCardinalOpen = cardinalOpen;
exports.curveCardinal = cardinal;
exports.curveCatmullRomClosed = catmullRomClosed;
exports.curveCatmullRomOpen = catmullRomOpen;
exports.curveCatmullRom = catmullRom;
exports.curveLinearClosed = linearClosed;
exports.curveLinear = curveLinear;
exports.curveMonotoneX = monotoneX;
exports.curveMonotoneY = monotoneY;
exports.curveNatural = natural;
exports.curveStep = step;
exports.curveStepAfter = stepAfter;
exports.curveStepBefore = stepBefore;
exports.stack = stack;
exports.stackOffsetExpand = expand;
exports.stackOffsetDiverging = diverging;
exports.stackOffsetNone = none$1;
exports.stackOffsetSilhouette = silhouette;
exports.stackOffsetWiggle = wiggle;
exports.stackOrderAscending = ascending$3;
exports.stackOrderDescending = descending$3;
exports.stackOrderInsideOut = insideOut;
exports.stackOrderNone = none$2;
exports.stackOrderReverse = reverse;
exports.timeInterval = newInterval;
exports.timeMillisecond = millisecond;
exports.timeMilliseconds = milliseconds;
exports.utcMillisecond = millisecond;
exports.utcMilliseconds = milliseconds;
exports.timeSecond = second;
exports.timeSeconds = seconds;
exports.utcSecond = second;
exports.utcSeconds = seconds;
exports.timeMinute = minute;
exports.timeMinutes = minutes;
exports.timeHour = hour;
exports.timeHours = hours;
exports.timeDay = day;
exports.timeDays = days;
exports.timeWeek = sunday;
exports.timeWeeks = sundays;
exports.timeSunday = sunday;
exports.timeSundays = sundays;
exports.timeMonday = monday;
exports.timeMondays = mondays;
exports.timeTuesday = tuesday;
exports.timeTuesdays = tuesdays;
exports.timeWednesday = wednesday;
exports.timeWednesdays = wednesdays;
exports.timeThursday = thursday;
exports.timeThursdays = thursdays;
exports.timeFriday = friday;
exports.timeFridays = fridays;
exports.timeSaturday = saturday;
exports.timeSaturdays = saturdays;
exports.timeMonth = month;
exports.timeMonths = months;
exports.timeYear = year;
exports.timeYears = years;
exports.utcMinute = utcMinute;
exports.utcMinutes = utcMinutes;
exports.utcHour = utcHour;
exports.utcHours = utcHours;
exports.utcDay = utcDay;
exports.utcDays = utcDays;
exports.utcWeek = utcSunday;
exports.utcWeeks = utcSundays;
exports.utcSunday = utcSunday;
exports.utcSundays = utcSundays;
exports.utcMonday = utcMonday;
exports.utcMondays = utcMondays;
exports.utcTuesday = utcTuesday;
exports.utcTuesdays = utcTuesdays;
exports.utcWednesday = utcWednesday;
exports.utcWednesdays = utcWednesdays;
exports.utcThursday = utcThursday;
exports.utcThursdays = utcThursdays;
exports.utcFriday = utcFriday;
exports.utcFridays = utcFridays;
exports.utcSaturday = utcSaturday;
exports.utcSaturdays = utcSaturdays;
exports.utcMonth = utcMonth;
exports.utcMonths = utcMonths;
exports.utcYear = utcYear;
exports.utcYears = utcYears;
exports.timeFormatDefaultLocale = defaultLocale$1;
exports.timeFormatLocale = formatLocale$1;
exports.isoFormat = formatIso;
exports.isoParse = parseIso;
exports.now = now;
exports.timer = timer;
exports.timerFlush = timerFlush;
exports.timeout = timeout$1;
exports.interval = interval$1;
exports.transition = transition;
exports.active = active;
exports.interrupt = interrupt;
exports.voronoi = voronoi;
exports.zoom = zoom;
exports.zoomTransform = transform$1;
exports.zoomIdentity = identity$9;
exports.wordwrap = wordwrap;
exports.parseAttributes = parseAttributes;
exports.f = f;
exports.ascendingKey = ascendingKey;
exports.descendingKey = descendingKey;
exports.conventions = conventions;
exports.drawAxis = drawAxis;
exports.attachTooltip = attachTooltip;
exports.loadData = loadData;
exports.nestBy = nestBy;
exports.round = round;
exports.clamp = clamp;
exports.polygonClip = polygonClip;
exports.schemeAccent = Accent;
exports.schemeDark2 = Dark2;
exports.schemePaired = Paired;
exports.schemePastel1 = Pastel1;
exports.schemePastel2 = Pastel2;
exports.schemeSet1 = Set1;
exports.schemeSet2 = Set2;
exports.schemeSet3 = Set3;
exports.interpolateBrBG = BrBG;
exports.schemeBrBG = scheme;
exports.interpolatePRGn = PRGn;
exports.schemePRGn = scheme$1;
exports.interpolatePiYG = PiYG;
exports.schemePiYG = scheme$2;
exports.interpolatePuOr = PuOr;
exports.schemePuOr = scheme$3;
exports.interpolateRdBu = RdBu;
exports.schemeRdBu = scheme$4;
exports.interpolateRdGy = RdGy;
exports.schemeRdGy = scheme$5;
exports.interpolateRdYlBu = RdYlBu;
exports.schemeRdYlBu = scheme$6;
exports.interpolateRdYlGn = RdYlGn;
exports.schemeRdYlGn = scheme$7;
exports.interpolateSpectral = Spectral;
exports.schemeSpectral = scheme$8;
exports.interpolateBuGn = BuGn;
exports.schemeBuGn = scheme$9;
exports.interpolateBuPu = BuPu;
exports.schemeBuPu = scheme$10;
exports.interpolateGnBu = GnBu;
exports.schemeGnBu = scheme$11;
exports.interpolateOrRd = OrRd;
exports.schemeOrRd = scheme$12;
exports.interpolatePuBuGn = PuBuGn;
exports.schemePuBuGn = scheme$13;
exports.interpolatePuBu = PuBu;
exports.schemePuBu = scheme$14;
exports.interpolatePuRd = PuRd;
exports.schemePuRd = scheme$15;
exports.interpolateRdPu = RdPu;
exports.schemeRdPu = scheme$16;
exports.interpolateYlGnBu = YlGnBu;
exports.schemeYlGnBu = scheme$17;
exports.interpolateYlGn = YlGn;
exports.schemeYlGn = scheme$18;
exports.interpolateYlOrBr = YlOrBr;
exports.schemeYlOrBr = scheme$19;
exports.interpolateYlOrRd = YlOrRd;
exports.schemeYlOrRd = scheme$20;
exports.interpolateBlues = Blues;
exports.schemeBlues = scheme$21;
exports.interpolateGreens = Greens;
exports.schemeGreens = scheme$22;
exports.interpolateGreys = Greys;
exports.schemeGreys = scheme$23;
exports.interpolatePurples = Purples;
exports.schemePurples = scheme$24;
exports.interpolateReds = Reds;
exports.schemeReds = scheme$25;
exports.interpolateOranges = Oranges;
exports.schemeOranges = scheme$26;

Object.defineProperty(exports, '__esModule', { value: true });

})));





;(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3')) :
  typeof define === 'function' && define.amd ? define(['exports', 'd3'], factory) :
  (factory((global.d3 = global.d3 || {}),global.d3));
}(this, function (exports,d3) { 'use strict';

  function graphScroll(){
    var windowHeight,
        dispatch = d3.dispatch("scroll", "active"),
        sections = d3.select('null'),
        i = NaN,
        sectionPos = [],
        n,
        graph = d3.select('null'),
        isFixed = null,
        isBelow = null,
        container = d3.select('body'),
        containerStart = 0,
        belowStart,
        eventId = Math.random(),
        offset = 200

    function reposition(){
      var i1 = 0
      sectionPos.forEach(function(d, i){
        if (d < pageYOffset - containerStart + offset) i1 = i
      })
      i1 = Math.min(n - 1, i1)

      var isBelow1 = pageYOffset > belowStart
      if (isBelow != isBelow1){
        isBelow = isBelow1
        container.classed('graph-scroll-below', isBelow)
      }
      var isFixed1 = !isBelow && pageYOffset > containerStart
      if (isFixed != isFixed1){
        isFixed = isFixed1
        container.classed('graph-scroll-fixed', isFixed)
      }

      if (isBelow) i1 = n - 1

      if (i != i1){
        sections.classed('graph-scroll-active', function(d, i){ return i === i1 })

        dispatch.call('active', null, i1)

        i = i1
      }
    }

    function resize(){
      sectionPos = []
      var startPos
      sections.each(function(d, i){
        if (!i) startPos = this.getBoundingClientRect().top
        sectionPos.push(this.getBoundingClientRect().top -  startPos) })

      var containerBB = container.node().getBoundingClientRect()
      var graphHeight = graph.node() ? graph.node().getBoundingClientRect().height : 0

      containerStart = containerBB.top + pageYOffset
      belowStart = containerBB.bottom - graphHeight + pageYOffset
    }

    function keydown() {
      if (!isFixed) return
      var delta
      switch (d3.event.keyCode) {
        case 39: // right arrow
        if (d3.event.metaKey) return
        case 40: // down arrow
        case 34: // page down
        delta = d3.event.metaKey ? Infinity : 1 ;break
        case 37: // left arrow
        if (d3.event.metaKey) return
        case 38: // up arrow
        case 33: // page up
        delta = d3.event.metaKey ? -Infinity : -1 ;break
        case 32: // space
        delta = d3.event.shiftKey ? -1 : 1
        ;break
        default: return
      }

      var i1 = Math.max(0, Math.min(i + delta, n - 1))
      if (i1 == i) return // let browser handle scrolling past last section
      d3.select(document.documentElement)
          .interrupt()
        .transition()
          .duration(500)
          .tween("scroll", function() {
            var i = d3.interpolateNumber(pageYOffset, sectionPos[i1] + containerStart)
            return function(t) { scrollTo(0, i(t)) }
          })

      d3.event.preventDefault()
    }


    var rv ={}

    rv.container = function(_x){
      if (!_x) return container

      container = _x
      return rv
    }

    rv.graph = function(_x){
      if (!_x) return graph

      graph = _x
      return rv
    }

    rv.eventId = function(_x){
      if (!_x) return eventId

      eventId = _x
      return rv
    }

    rv.sections = function (_x){
      if (!_x) return sections

      sections = _x
      n = sections.size()

      d3.select(window)
          .on('scroll.gscroll'  + eventId, reposition)
          .on('resize.gscroll'  + eventId, resize)
          .on('keydown.gscroll' + eventId, keydown)
      
      resize()
      if (window['gscrollTimer' + eventId]) window['gscrollTimer' + eventId].stop()
      window['gscrollTimer' + eventId] = d3.timer(reposition);

      return rv
    }

    rv.on = function() {
      var value = dispatch.on.apply(dispatch, arguments);
      return value === dispatch ? rv : value;
    }
    
    rv.offset = function(_x) {
      if(!_x) return offset
      
      offset = _x
      return rv
    }

    return rv
  }

  exports.graphScroll = graphScroll;

  Object.defineProperty(exports, '__esModule', { value: true });

}));

index.html

<!DOCTYPE html>
<html>
<head>
<body>
	<div id='graph'></div>
</body>

<script src='d3+_.js'></script>
<script src='lib-build.js'></script>
<script src='_script.js'></script>
</html>

lib-build.js

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var libs = {
  reglLib: require('regl'),
}



for (key in libs) window[key] = libs[key]

},{"regl":2}],2:[function(require,module,exports){
(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
	typeof define === 'function' && define.amd ? define(factory) :
	(global.createREGL = factory());
}(this, (function () { 'use strict';

var arrayTypes =  {
	"[object Int8Array]": 5120,
	"[object Int16Array]": 5122,
	"[object Int32Array]": 5124,
	"[object Uint8Array]": 5121,
	"[object Uint8ClampedArray]": 5121,
	"[object Uint16Array]": 5123,
	"[object Uint32Array]": 5125,
	"[object Float32Array]": 5126,
	"[object Float64Array]": 5121,
	"[object ArrayBuffer]": 5121
};

var isTypedArray = function (x) {
  return Object.prototype.toString.call(x) in arrayTypes
};

var extend = function (base, opts) {
  var keys = Object.keys(opts);
  for (var i = 0; i < keys.length; ++i) {
    base[keys[i]] = opts[keys[i]];
  }
  return base
};

// Error checking and parameter validation.
//
// Statements for the form `check.someProcedure(...)` get removed by
// a browserify transform for optimized/minified bundles.
//
/* globals btoa */
// only used for extracting shader names.  if btoa not present, then errors
// will be slightly crappier
function decodeB64 (str) {
  if (typeof btoa !== 'undefined') {
    return btoa(str)
  }
  return 'base64:' + str
}

function raise (message) {
  var error = new Error('(regl) ' + message);
  console.error(error);
  throw error
}

function check (pred, message) {
  if (!pred) {
    raise(message);
  }
}

function encolon (message) {
  if (message) {
    return ': ' + message
  }
  return ''
}

function checkParameter (param, possibilities, message) {
  if (!(param in possibilities)) {
    raise('unknown parameter (' + param + ')' + encolon(message) +
          '. possible values: ' + Object.keys(possibilities).join());
  }
}

function checkIsTypedArray (data, message) {
  if (!isTypedArray(data)) {
    raise(
      'invalid parameter type' + encolon(message) +
      '. must be a typed array');
  }
}

function checkTypeOf (value, type, message) {
  if (typeof value !== type) {
    raise(
      'invalid parameter type' + encolon(message) +
      '. expected ' + type + ', got ' + (typeof value));
  }
}

function checkNonNegativeInt (value, message) {
  if (!((value >= 0) &&
        ((value | 0) === value))) {
    raise('invalid parameter type, (' + value + ')' + encolon(message) +
          '. must be a nonnegative integer');
  }
}

function checkOneOf (value, list, message) {
  if (list.indexOf(value) < 0) {
    raise('invalid value' + encolon(message) + '. must be one of: ' + list);
  }
}

var constructorKeys = [
  'gl',
  'canvas',
  'container',
  'attributes',
  'pixelRatio',
  'extensions',
  'optionalExtensions',
  'profile',
  'onDone'
];

function checkConstructor (obj) {
  Object.keys(obj).forEach(function (key) {
    if (constructorKeys.indexOf(key) < 0) {
      raise('invalid regl constructor argument "' + key + '". must be one of ' + constructorKeys);
    }
  });
}

function leftPad (str, n) {
  str = str + '';
  while (str.length < n) {
    str = ' ' + str;
  }
  return str
}

function ShaderFile () {
  this.name = 'unknown';
  this.lines = [];
  this.index = {};
  this.hasErrors = false;
}

function ShaderLine (number, line) {
  this.number = number;
  this.line = line;
  this.errors = [];
}

function ShaderError (fileNumber, lineNumber, message) {
  this.file = fileNumber;
  this.line = lineNumber;
  this.message = message;
}

function guessCommand () {
  var error = new Error();
  var stack = (error.stack || error).toString();
  var pat = /compileProcedure.*\n\s*at.*\((.*)\)/.exec(stack);
  if (pat) {
    return pat[1]
  }
  var pat2 = /compileProcedure.*\n\s*at\s+(.*)(\n|$)/.exec(stack);
  if (pat2) {
    return pat2[1]
  }
  return 'unknown'
}

function guessCallSite () {
  var error = new Error();
  var stack = (error.stack || error).toString();
  var pat = /at REGLCommand.*\n\s+at.*\((.*)\)/.exec(stack);
  if (pat) {
    return pat[1]
  }
  var pat2 = /at REGLCommand.*\n\s+at\s+(.*)\n/.exec(stack);
  if (pat2) {
    return pat2[1]
  }
  return 'unknown'
}

function parseSource (source, command) {
  var lines = source.split('\n');
  var lineNumber = 1;
  var fileNumber = 0;
  var files = {
    unknown: new ShaderFile(),
    0: new ShaderFile()
  };
  files.unknown.name = files[0].name = command || guessCommand();
  files.unknown.lines.push(new ShaderLine(0, ''));
  for (var i = 0; i < lines.length; ++i) {
    var line = lines[i];
    var parts = /^\s*\#\s*(\w+)\s+(.+)\s*$/.exec(line);
    if (parts) {
      switch (parts[1]) {
        case 'line':
          var lineNumberInfo = /(\d+)(\s+\d+)?/.exec(parts[2]);
          if (lineNumberInfo) {
            lineNumber = lineNumberInfo[1] | 0;
            if (lineNumberInfo[2]) {
              fileNumber = lineNumberInfo[2] | 0;
              if (!(fileNumber in files)) {
                files[fileNumber] = new ShaderFile();
              }
            }
          }
          break
        case 'define':
          var nameInfo = /SHADER_NAME(_B64)?\s+(.*)$/.exec(parts[2]);
          if (nameInfo) {
            files[fileNumber].name = (nameInfo[1]
                ? decodeB64(nameInfo[2])
                : nameInfo[2]);
          }
          break
      }
    }
    files[fileNumber].lines.push(new ShaderLine(lineNumber++, line));
  }
  Object.keys(files).forEach(function (fileNumber) {
    var file = files[fileNumber];
    file.lines.forEach(function (line) {
      file.index[line.number] = line;
    });
  });
  return files
}

function parseErrorLog (errLog) {
  var result = [];
  errLog.split('\n').forEach(function (errMsg) {
    if (errMsg.length < 5) {
      return
    }
    var parts = /^ERROR\:\s+(\d+)\:(\d+)\:\s*(.*)$/.exec(errMsg);
    if (parts) {
      result.push(new ShaderError(
        parts[1] | 0,
        parts[2] | 0,
        parts[3].trim()));
    } else if (errMsg.length > 0) {
      result.push(new ShaderError('unknown', 0, errMsg));
    }
  });
  return result
}

function annotateFiles (files, errors) {
  errors.forEach(function (error) {
    var file = files[error.file];
    if (file) {
      var line = file.index[error.line];
      if (line) {
        line.errors.push(error);
        file.hasErrors = true;
        return
      }
    }
    files.unknown.hasErrors = true;
    files.unknown.lines[0].errors.push(error);
  });
}

function checkShaderError (gl, shader, source, type, command) {
  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    var errLog = gl.getShaderInfoLog(shader);
    var typeName = type === gl.FRAGMENT_SHADER ? 'fragment' : 'vertex';
    checkCommandType(source, 'string', typeName + ' shader source must be a string', command);
    var files = parseSource(source, command);
    var errors = parseErrorLog(errLog);
    annotateFiles(files, errors);

    Object.keys(files).forEach(function (fileNumber) {
      var file = files[fileNumber];
      if (!file.hasErrors) {
        return
      }

      var strings = [''];
      var styles = [''];

      function push (str, style) {
        strings.push(str);
        styles.push(style || '');
      }

      push('file number ' + fileNumber + ': ' + file.name + '\n', 'color:red;text-decoration:underline;font-weight:bold');

      file.lines.forEach(function (line) {
        if (line.errors.length > 0) {
          push(leftPad(line.number, 4) + '|  ', 'background-color:yellow; font-weight:bold');
          push(line.line + '\n', 'color:red; background-color:yellow; font-weight:bold');

          // try to guess token
          var offset = 0;
          line.errors.forEach(function (error) {
            var message = error.message;
            var token = /^\s*\'(.*)\'\s*\:\s*(.*)$/.exec(message);
            if (token) {
              var tokenPat = token[1];
              message = token[2];
              switch (tokenPat) {
                case 'assign':
                  tokenPat = '=';
                  break
              }
              offset = Math.max(line.line.indexOf(tokenPat, offset), 0);
            } else {
              offset = 0;
            }

            push(leftPad('| ', 6));
            push(leftPad('^^^', offset + 3) + '\n', 'font-weight:bold');
            push(leftPad('| ', 6));
            push(message + '\n', 'font-weight:bold');
          });
          push(leftPad('| ', 6) + '\n');
        } else {
          push(leftPad(line.number, 4) + '|  ');
          push(line.line + '\n', 'color:red');
        }
      });
      if (typeof document !== 'undefined') {
        styles[0] = strings.join('%c');
        console.log.apply(console, styles);
      } else {
        console.log(strings.join(''));
      }
    });

    check.raise('Error compiling ' + typeName + ' shader, ' + files[0].name);
  }
}

function checkLinkError (gl, program, fragShader, vertShader, command) {
  if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
    var errLog = gl.getProgramInfoLog(program);
    var fragParse = parseSource(fragShader, command);
    var vertParse = parseSource(vertShader, command);

    var header = 'Error linking program with vertex shader, "' +
      vertParse[0].name + '", and fragment shader "' + fragParse[0].name + '"';

    if (typeof document !== 'undefined') {
      console.log('%c' + header + '\n%c' + errLog,
        'color:red;text-decoration:underline;font-weight:bold',
        'color:red');
    } else {
      console.log(header + '\n' + errLog);
    }
    check.raise(header);
  }
}

function saveCommandRef (object) {
  object._commandRef = guessCommand();
}

function saveDrawCommandInfo (opts, uniforms, attributes, stringStore) {
  saveCommandRef(opts);

  function id (str) {
    if (str) {
      return stringStore.id(str)
    }
    return 0
  }
  opts._fragId = id(opts.static.frag);
  opts._vertId = id(opts.static.vert);

  function addProps (dict, set) {
    Object.keys(set).forEach(function (u) {
      dict[stringStore.id(u)] = true;
    });
  }

  var uniformSet = opts._uniformSet = {};
  addProps(uniformSet, uniforms.static);
  addProps(uniformSet, uniforms.dynamic);

  var attributeSet = opts._attributeSet = {};
  addProps(attributeSet, attributes.static);
  addProps(attributeSet, attributes.dynamic);

  opts._hasCount = (
    'count' in opts.static ||
    'count' in opts.dynamic ||
    'elements' in opts.static ||
    'elements' in opts.dynamic);
}

function commandRaise (message, command) {
  var callSite = guessCallSite();
  raise(message +
    ' in command ' + (command || guessCommand()) +
    (callSite === 'unknown' ? '' : ' called from ' + callSite));
}

function checkCommand (pred, message, command) {
  if (!pred) {
    commandRaise(message, command || guessCommand());
  }
}

function checkParameterCommand (param, possibilities, message, command) {
  if (!(param in possibilities)) {
    commandRaise(
      'unknown parameter (' + param + ')' + encolon(message) +
      '. possible values: ' + Object.keys(possibilities).join(),
      command || guessCommand());
  }
}

function checkCommandType (value, type, message, command) {
  if (typeof value !== type) {
    commandRaise(
      'invalid parameter type' + encolon(message) +
      '. expected ' + type + ', got ' + (typeof value),
      command || guessCommand());
  }
}

function checkOptional (block) {
  block();
}

function checkFramebufferFormat (attachment, texFormats, rbFormats) {
  if (attachment.texture) {
    checkOneOf(
      attachment.texture._texture.internalformat,
      texFormats,
      'unsupported texture format for attachment');
  } else {
    checkOneOf(
      attachment.renderbuffer._renderbuffer.format,
      rbFormats,
      'unsupported renderbuffer format for attachment');
  }
}

var GL_CLAMP_TO_EDGE = 0x812F;

var GL_NEAREST = 0x2600;
var GL_NEAREST_MIPMAP_NEAREST = 0x2700;
var GL_LINEAR_MIPMAP_NEAREST = 0x2701;
var GL_NEAREST_MIPMAP_LINEAR = 0x2702;
var GL_LINEAR_MIPMAP_LINEAR = 0x2703;

var GL_BYTE = 5120;
var GL_UNSIGNED_BYTE = 5121;
var GL_SHORT = 5122;
var GL_UNSIGNED_SHORT = 5123;
var GL_INT = 5124;
var GL_UNSIGNED_INT = 5125;
var GL_FLOAT = 5126;

var GL_UNSIGNED_SHORT_4_4_4_4 = 0x8033;
var GL_UNSIGNED_SHORT_5_5_5_1 = 0x8034;
var GL_UNSIGNED_SHORT_5_6_5 = 0x8363;
var GL_UNSIGNED_INT_24_8_WEBGL = 0x84FA;

var GL_HALF_FLOAT_OES = 0x8D61;

var TYPE_SIZE = {};

TYPE_SIZE[GL_BYTE] =
TYPE_SIZE[GL_UNSIGNED_BYTE] = 1;

TYPE_SIZE[GL_SHORT] =
TYPE_SIZE[GL_UNSIGNED_SHORT] =
TYPE_SIZE[GL_HALF_FLOAT_OES] =
TYPE_SIZE[GL_UNSIGNED_SHORT_5_6_5] =
TYPE_SIZE[GL_UNSIGNED_SHORT_4_4_4_4] =
TYPE_SIZE[GL_UNSIGNED_SHORT_5_5_5_1] = 2;

TYPE_SIZE[GL_INT] =
TYPE_SIZE[GL_UNSIGNED_INT] =
TYPE_SIZE[GL_FLOAT] =
TYPE_SIZE[GL_UNSIGNED_INT_24_8_WEBGL] = 4;

function pixelSize (type, channels) {
  if (type === GL_UNSIGNED_SHORT_5_5_5_1 ||
      type === GL_UNSIGNED_SHORT_4_4_4_4 ||
      type === GL_UNSIGNED_SHORT_5_6_5) {
    return 2
  } else if (type === GL_UNSIGNED_INT_24_8_WEBGL) {
    return 4
  } else {
    return TYPE_SIZE[type] * channels
  }
}

function isPow2 (v) {
  return !(v & (v - 1)) && (!!v)
}

function checkTexture2D (info, mipData, limits) {
  var i;
  var w = mipData.width;
  var h = mipData.height;
  var c = mipData.channels;

  // Check texture shape
  check(w > 0 && w <= limits.maxTextureSize &&
        h > 0 && h <= limits.maxTextureSize,
        'invalid texture shape');

  // check wrap mode
  if (info.wrapS !== GL_CLAMP_TO_EDGE || info.wrapT !== GL_CLAMP_TO_EDGE) {
    check(isPow2(w) && isPow2(h),
      'incompatible wrap mode for texture, both width and height must be power of 2');
  }

  if (mipData.mipmask === 1) {
    if (w !== 1 && h !== 1) {
      check(
        info.minFilter !== GL_NEAREST_MIPMAP_NEAREST &&
        info.minFilter !== GL_NEAREST_MIPMAP_LINEAR &&
        info.minFilter !== GL_LINEAR_MIPMAP_NEAREST &&
        info.minFilter !== GL_LINEAR_MIPMAP_LINEAR,
        'min filter requires mipmap');
    }
  } else {
    // texture must be power of 2
    check(isPow2(w) && isPow2(h),
      'texture must be a square power of 2 to support mipmapping');
    check(mipData.mipmask === (w << 1) - 1,
      'missing or incomplete mipmap data');
  }

  if (mipData.type === GL_FLOAT) {
    if (limits.extensions.indexOf('oes_texture_float_linear') < 0) {
      check(info.minFilter === GL_NEAREST && info.magFilter === GL_NEAREST,
        'filter not supported, must enable oes_texture_float_linear');
    }
    check(!info.genMipmaps,
      'mipmap generation not supported with float textures');
  }

  // check image complete
  var mipimages = mipData.images;
  for (i = 0; i < 16; ++i) {
    if (mipimages[i]) {
      var mw = w >> i;
      var mh = h >> i;
      check(mipData.mipmask & (1 << i), 'missing mipmap data');

      var img = mipimages[i];

      check(
        img.width === mw &&
        img.height === mh,
        'invalid shape for mip images');

      check(
        img.format === mipData.format &&
        img.internalformat === mipData.internalformat &&
        img.type === mipData.type,
        'incompatible type for mip image');

      if (img.compressed) {
        // TODO: check size for compressed images
      } else if (img.data) {
        // check(img.data.byteLength === mw * mh *
        // Math.max(pixelSize(img.type, c), img.unpackAlignment),
        var rowSize = Math.ceil(pixelSize(img.type, c) * mw / img.unpackAlignment) * img.unpackAlignment;
        check(img.data.byteLength === rowSize * mh,
          'invalid data for image, buffer size is inconsistent with image format');
      } else if (img.element) {
        // TODO: check element can be loaded
      } else if (img.copy) {
        // TODO: check compatible format and type
      }
    } else if (!info.genMipmaps) {
      check((mipData.mipmask & (1 << i)) === 0, 'extra mipmap data');
    }
  }

  if (mipData.compressed) {
    check(!info.genMipmaps,
      'mipmap generation for compressed images not supported');
  }
}

function checkTextureCube (texture, info, faces, limits) {
  var w = texture.width;
  var h = texture.height;
  var c = texture.channels;

  // Check texture shape
  check(
    w > 0 && w <= limits.maxTextureSize && h > 0 && h <= limits.maxTextureSize,
    'invalid texture shape');
  check(
    w === h,
    'cube map must be square');
  check(
    info.wrapS === GL_CLAMP_TO_EDGE && info.wrapT === GL_CLAMP_TO_EDGE,
    'wrap mode not supported by cube map');

  for (var i = 0; i < faces.length; ++i) {
    var face = faces[i];
    check(
      face.width === w && face.height === h,
      'inconsistent cube map face shape');

    if (info.genMipmaps) {
      check(!face.compressed,
        'can not generate mipmap for compressed textures');
      check(face.mipmask === 1,
        'can not specify mipmaps and generate mipmaps');
    } else {
      // TODO: check mip and filter mode
    }

    var mipmaps = face.images;
    for (var j = 0; j < 16; ++j) {
      var img = mipmaps[j];
      if (img) {
        var mw = w >> j;
        var mh = h >> j;
        check(face.mipmask & (1 << j), 'missing mipmap data');
        check(
          img.width === mw &&
          img.height === mh,
          'invalid shape for mip images');
        check(
          img.format === texture.format &&
          img.internalformat === texture.internalformat &&
          img.type === texture.type,
          'incompatible type for mip image');

        if (img.compressed) {
          // TODO: check size for compressed images
        } else if (img.data) {
          check(img.data.byteLength === mw * mh *
            Math.max(pixelSize(img.type, c), img.unpackAlignment),
            'invalid data for image, buffer size is inconsistent with image format');
        } else if (img.element) {
          // TODO: check element can be loaded
        } else if (img.copy) {
          // TODO: check compatible format and type
        }
      }
    }
  }
}

var check$1 = extend(check, {
  optional: checkOptional,
  raise: raise,
  commandRaise: commandRaise,
  command: checkCommand,
  parameter: checkParameter,
  commandParameter: checkParameterCommand,
  constructor: checkConstructor,
  type: checkTypeOf,
  commandType: checkCommandType,
  isTypedArray: checkIsTypedArray,
  nni: checkNonNegativeInt,
  oneOf: checkOneOf,
  shaderError: checkShaderError,
  linkError: checkLinkError,
  callSite: guessCallSite,
  saveCommandRef: saveCommandRef,
  saveDrawInfo: saveDrawCommandInfo,
  framebufferFormat: checkFramebufferFormat,
  guessCommand: guessCommand,
  texture2D: checkTexture2D,
  textureCube: checkTextureCube
});

var VARIABLE_COUNTER = 0;

var DYN_FUNC = 0;

function DynamicVariable (type, data) {
  this.id = (VARIABLE_COUNTER++);
  this.type = type;
  this.data = data;
}

function escapeStr (str) {
  return str.replace(/\\/g, '\\\\').replace(/"/g, '\\"')
}

function splitParts (str) {
  if (str.length === 0) {
    return []
  }

  var firstChar = str.charAt(0);
  var lastChar = str.charAt(str.length - 1);

  if (str.length > 1 &&
      firstChar === lastChar &&
      (firstChar === '"' || firstChar === "'")) {
    return ['"' + escapeStr(str.substr(1, str.length - 2)) + '"']
  }

  var parts = /\[(false|true|null|\d+|'[^']*'|"[^"]*")\]/.exec(str);
  if (parts) {
    return (
      splitParts(str.substr(0, parts.index))
      .concat(splitParts(parts[1]))
      .concat(splitParts(str.substr(parts.index + parts[0].length)))
    )
  }

  var subparts = str.split('.');
  if (subparts.length === 1) {
    return ['"' + escapeStr(str) + '"']
  }

  var result = [];
  for (var i = 0; i < subparts.length; ++i) {
    result = result.concat(splitParts(subparts[i]));
  }
  return result
}

function toAccessorString (str) {
  return '[' + splitParts(str).join('][') + ']'
}

function defineDynamic (type, data) {
  return new DynamicVariable(type, toAccessorString(data + ''))
}

function isDynamic (x) {
  return (typeof x === 'function' && !x._reglType) ||
         x instanceof DynamicVariable
}

function unbox (x, path) {
  if (typeof x === 'function') {
    return new DynamicVariable(DYN_FUNC, x)
  }
  return x
}

var dynamic = {
  DynamicVariable: DynamicVariable,
  define: defineDynamic,
  isDynamic: isDynamic,
  unbox: unbox,
  accessor: toAccessorString
};

/* globals requestAnimationFrame, cancelAnimationFrame */
var raf = {
  next: typeof requestAnimationFrame === 'function'
    ? function (cb) { return requestAnimationFrame(cb) }
    : function (cb) { return setTimeout(cb, 16) },
  cancel: typeof cancelAnimationFrame === 'function'
    ? function (raf) { return cancelAnimationFrame(raf) }
    : clearTimeout
};

/* globals performance */
var clock = (typeof performance !== 'undefined' && performance.now)
  ? function () { return performance.now() }
  : function () { return +(new Date()) };

function createStringStore () {
  var stringIds = {'': 0};
  var stringValues = [''];
  return {
    id: function (str) {
      var result = stringIds[str];
      if (result) {
        return result
      }
      result = stringIds[str] = stringValues.length;
      stringValues.push(str);
      return result
    },

    str: function (id) {
      return stringValues[id]
    }
  }
}

// Context and canvas creation helper functions
function createCanvas (element, onDone, pixelRatio) {
  var canvas = document.createElement('canvas');
  extend(canvas.style, {
    border: 0,
    margin: 0,
    padding: 0,
    top: 0,
    left: 0
  });
  element.appendChild(canvas);

  if (element === document.body) {
    canvas.style.position = 'absolute';
    extend(element.style, {
      margin: 0,
      padding: 0
    });
  }

  function resize () {
    var w = window.innerWidth;
    var h = window.innerHeight;
    if (element !== document.body) {
      var bounds = element.getBoundingClientRect();
      w = bounds.right - bounds.left;
      h = bounds.bottom - bounds.top;
    }
    canvas.width = pixelRatio * w;
    canvas.height = pixelRatio * h;
    extend(canvas.style, {
      width: w + 'px',
      height: h + 'px'
    });
  }

  window.addEventListener('resize', resize, false);

  function onDestroy () {
    window.removeEventListener('resize', resize);
    element.removeChild(canvas);
  }

  resize();

  return {
    canvas: canvas,
    onDestroy: onDestroy
  }
}

function createContext (canvas, contexAttributes) {
  function get (name) {
    try {
      return canvas.getContext(name, contexAttributes)
    } catch (e) {
      return null
    }
  }
  return (
    get('webgl') ||
    get('experimental-webgl') ||
    get('webgl-experimental')
  )
}

function isHTMLElement (obj) {
  return (
    typeof obj.nodeName === 'string' &&
    typeof obj.appendChild === 'function' &&
    typeof obj.getBoundingClientRect === 'function'
  )
}

function isWebGLContext (obj) {
  return (
    typeof obj.drawArrays === 'function' ||
    typeof obj.drawElements === 'function'
  )
}

function parseExtensions (input) {
  if (typeof input === 'string') {
    return input.split()
  }
  check$1(Array.isArray(input), 'invalid extension array');
  return input
}

function getElement (desc) {
  if (typeof desc === 'string') {
    check$1(typeof document !== 'undefined', 'not supported outside of DOM');
    return document.querySelector(desc)
  }
  return desc
}

function parseArgs (args_) {
  var args = args_ || {};
  var element, container, canvas, gl;
  var contextAttributes = {};
  var extensions = [];
  var optionalExtensions = [];
  var pixelRatio = (typeof window === 'undefined' ? 1 : window.devicePixelRatio);
  var profile = false;
  var onDone = function (err) {
    if (err) {
      check$1.raise(err);
    }
  };
  var onDestroy = function () {};
  if (typeof args === 'string') {
    check$1(
      typeof document !== 'undefined',
      'selector queries only supported in DOM enviroments');
    element = document.querySelector(args);
    check$1(element, 'invalid query string for element');
  } else if (typeof args === 'object') {
    if (isHTMLElement(args)) {
      element = args;
    } else if (isWebGLContext(args)) {
      gl = args;
      canvas = gl.canvas;
    } else {
      check$1.constructor(args);
      if ('gl' in args) {
        gl = args.gl;
      } else if ('canvas' in args) {
        canvas = getElement(args.canvas);
      } else if ('container' in args) {
        container = getElement(args.container);
      }
      if ('attributes' in args) {
        contextAttributes = args.attributes;
        check$1.type(contextAttributes, 'object', 'invalid context attributes');
      }
      if ('extensions' in args) {
        extensions = parseExtensions(args.extensions);
      }
      if ('optionalExtensions' in args) {
        optionalExtensions = parseExtensions(args.optionalExtensions);
      }
      if ('onDone' in args) {
        check$1.type(
          args.onDone, 'function',
          'invalid or missing onDone callback');
        onDone = args.onDone;
      }
      if ('profile' in args) {
        profile = !!args.profile;
      }
      if ('pixelRatio' in args) {
        pixelRatio = +args.pixelRatio;
        check$1(pixelRatio > 0, 'invalid pixel ratio');
      }
    }
  } else {
    check$1.raise('invalid arguments to regl');
  }

  if (element) {
    if (element.nodeName.toLowerCase() === 'canvas') {
      canvas = element;
    } else {
      container = element;
    }
  }

  if (!gl) {
    if (!canvas) {
      check$1(
        typeof document !== 'undefined',
        'must manually specify webgl context outside of DOM environments');
      var result = createCanvas(container || document.body, onDone, pixelRatio);
      if (!result) {
        return null
      }
      canvas = result.canvas;
      onDestroy = result.onDestroy;
    }
    gl = createContext(canvas, contextAttributes);
  }

  if (!gl) {
    onDestroy();
    onDone('webgl not supported, try upgrading your browser or graphics drivers http://get.webgl.org');
    return null
  }

  return {
    gl: gl,
    canvas: canvas,
    container: container,
    extensions: extensions,
    optionalExtensions: optionalExtensions,
    pixelRatio: pixelRatio,
    profile: profile,
    onDone: onDone,
    onDestroy: onDestroy
  }
}

function createExtensionCache (gl, config) {
  var extensions = {};

  function tryLoadExtension (name_) {
    check$1.type(name_, 'string', 'extension name must be string');
    var name = name_.toLowerCase();
    var ext;
    try {
      ext = extensions[name] = gl.getExtension(name);
    } catch (e) {}
    return !!ext
  }

  for (var i = 0; i < config.extensions.length; ++i) {
    var name = config.extensions[i];
    if (!tryLoadExtension(name)) {
      config.onDestroy();
      config.onDone('"' + name + '" extension is not supported by the current WebGL context, try upgrading your system or a different browser');
      return null
    }
  }

  config.optionalExtensions.forEach(tryLoadExtension);

  return {
    extensions: extensions,
    restore: function () {
      Object.keys(extensions).forEach(function (name) {
        if (!tryLoadExtension(name)) {
          throw new Error('(regl): error restoring extension ' + name)
        }
      });
    }
  }
}

var GL_SUBPIXEL_BITS = 0x0D50;
var GL_RED_BITS = 0x0D52;
var GL_GREEN_BITS = 0x0D53;
var GL_BLUE_BITS = 0x0D54;
var GL_ALPHA_BITS = 0x0D55;
var GL_DEPTH_BITS = 0x0D56;
var GL_STENCIL_BITS = 0x0D57;

var GL_ALIASED_POINT_SIZE_RANGE = 0x846D;
var GL_ALIASED_LINE_WIDTH_RANGE = 0x846E;

var GL_MAX_TEXTURE_SIZE = 0x0D33;
var GL_MAX_VIEWPORT_DIMS = 0x0D3A;
var GL_MAX_VERTEX_ATTRIBS = 0x8869;
var GL_MAX_VERTEX_UNIFORM_VECTORS = 0x8DFB;
var GL_MAX_VARYING_VECTORS = 0x8DFC;
var GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D;
var GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS = 0x8B4C;
var GL_MAX_TEXTURE_IMAGE_UNITS = 0x8872;
var GL_MAX_FRAGMENT_UNIFORM_VECTORS = 0x8DFD;
var GL_MAX_CUBE_MAP_TEXTURE_SIZE = 0x851C;
var GL_MAX_RENDERBUFFER_SIZE = 0x84E8;

var GL_VENDOR = 0x1F00;
var GL_RENDERER = 0x1F01;
var GL_VERSION = 0x1F02;
var GL_SHADING_LANGUAGE_VERSION = 0x8B8C;

var GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT = 0x84FF;

var GL_MAX_COLOR_ATTACHMENTS_WEBGL = 0x8CDF;
var GL_MAX_DRAW_BUFFERS_WEBGL = 0x8824;

var wrapLimits = function (gl, extensions) {
  var maxAnisotropic = 1;
  if (extensions.ext_texture_filter_anisotropic) {
    maxAnisotropic = gl.getParameter(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
  }

  var maxDrawbuffers = 1;
  var maxColorAttachments = 1;
  if (extensions.webgl_draw_buffers) {
    maxDrawbuffers = gl.getParameter(GL_MAX_DRAW_BUFFERS_WEBGL);
    maxColorAttachments = gl.getParameter(GL_MAX_COLOR_ATTACHMENTS_WEBGL);
  }

  return {
    // drawing buffer bit depth
    colorBits: [
      gl.getParameter(GL_RED_BITS),
      gl.getParameter(GL_GREEN_BITS),
      gl.getParameter(GL_BLUE_BITS),
      gl.getParameter(GL_ALPHA_BITS)
    ],
    depthBits: gl.getParameter(GL_DEPTH_BITS),
    stencilBits: gl.getParameter(GL_STENCIL_BITS),
    subpixelBits: gl.getParameter(GL_SUBPIXEL_BITS),

    // supported extensions
    extensions: Object.keys(extensions).filter(function (ext) {
      return !!extensions[ext]
    }),

    // max aniso samples
    maxAnisotropic: maxAnisotropic,

    // max draw buffers
    maxDrawbuffers: maxDrawbuffers,
    maxColorAttachments: maxColorAttachments,

    // point and line size ranges
    pointSizeDims: gl.getParameter(GL_ALIASED_POINT_SIZE_RANGE),
    lineWidthDims: gl.getParameter(GL_ALIASED_LINE_WIDTH_RANGE),
    maxViewportDims: gl.getParameter(GL_MAX_VIEWPORT_DIMS),
    maxCombinedTextureUnits: gl.getParameter(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS),
    maxCubeMapSize: gl.getParameter(GL_MAX_CUBE_MAP_TEXTURE_SIZE),
    maxRenderbufferSize: gl.getParameter(GL_MAX_RENDERBUFFER_SIZE),
    maxTextureUnits: gl.getParameter(GL_MAX_TEXTURE_IMAGE_UNITS),
    maxTextureSize: gl.getParameter(GL_MAX_TEXTURE_SIZE),
    maxAttributes: gl.getParameter(GL_MAX_VERTEX_ATTRIBS),
    maxVertexUniforms: gl.getParameter(GL_MAX_VERTEX_UNIFORM_VECTORS),
    maxVertexTextureUnits: gl.getParameter(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS),
    maxVaryingVectors: gl.getParameter(GL_MAX_VARYING_VECTORS),
    maxFragmentUniforms: gl.getParameter(GL_MAX_FRAGMENT_UNIFORM_VECTORS),

    // vendor info
    glsl: gl.getParameter(GL_SHADING_LANGUAGE_VERSION),
    renderer: gl.getParameter(GL_RENDERER),
    vendor: gl.getParameter(GL_VENDOR),
    version: gl.getParameter(GL_VERSION)
  }
};

function isNDArrayLike (obj) {
  return (
    !!obj &&
    typeof obj === 'object' &&
    Array.isArray(obj.shape) &&
    Array.isArray(obj.stride) &&
    typeof obj.offset === 'number' &&
    obj.shape.length === obj.stride.length &&
    (Array.isArray(obj.data) ||
      isTypedArray(obj.data)))
}

var values = function (obj) {
  return Object.keys(obj).map(function (key) { return obj[key] })
};

function loop (n, f) {
  var result = Array(n);
  for (var i = 0; i < n; ++i) {
    result[i] = f(i);
  }
  return result
}

var GL_BYTE$1 = 5120;
var GL_UNSIGNED_BYTE$2 = 5121;
var GL_SHORT$1 = 5122;
var GL_UNSIGNED_SHORT$1 = 5123;
var GL_INT$1 = 5124;
var GL_UNSIGNED_INT$1 = 5125;
var GL_FLOAT$2 = 5126;

var bufferPool = loop(8, function () {
  return []
});

function nextPow16 (v) {
  for (var i = 16; i <= (1 << 28); i *= 16) {
    if (v <= i) {
      return i
    }
  }
  return 0
}

function log2 (v) {
  var r, shift;
  r = (v > 0xFFFF) << 4;
  v >>>= r;
  shift = (v > 0xFF) << 3;
  v >>>= shift; r |= shift;
  shift = (v > 0xF) << 2;
  v >>>= shift; r |= shift;
  shift = (v > 0x3) << 1;
  v >>>= shift; r |= shift;
  return r | (v >> 1)
}

function alloc (n) {
  var sz = nextPow16(n);
  var bin = bufferPool[log2(sz) >> 2];
  if (bin.length > 0) {
    return bin.pop()
  }
  return new ArrayBuffer(sz)
}

function free (buf) {
  bufferPool[log2(buf.byteLength) >> 2].push(buf);
}

function allocType (type, n) {
  var result = null;
  switch (type) {
    case GL_BYTE$1:
      result = new Int8Array(alloc(n), 0, n);
      break
    case GL_UNSIGNED_BYTE$2:
      result = new Uint8Array(alloc(n), 0, n);
      break
    case GL_SHORT$1:
      result = new Int16Array(alloc(2 * n), 0, n);
      break
    case GL_UNSIGNED_SHORT$1:
      result = new Uint16Array(alloc(2 * n), 0, n);
      break
    case GL_INT$1:
      result = new Int32Array(alloc(4 * n), 0, n);
      break
    case GL_UNSIGNED_INT$1:
      result = new Uint32Array(alloc(4 * n), 0, n);
      break
    case GL_FLOAT$2:
      result = new Float32Array(alloc(4 * n), 0, n);
      break
    default:
      return null
  }
  if (result.length !== n) {
    return result.subarray(0, n)
  }
  return result
}

function freeType (array) {
  free(array.buffer);
}

var pool = {
  alloc: alloc,
  free: free,
  allocType: allocType,
  freeType: freeType
};

var flattenUtils = {
  shape: arrayShape$1,
  flatten: flattenArray
};

function flatten1D (array, nx, out) {
  for (var i = 0; i < nx; ++i) {
    out[i] = array[i];
  }
}

function flatten2D (array, nx, ny, out) {
  var ptr = 0;
  for (var i = 0; i < nx; ++i) {
    var row = array[i];
    for (var j = 0; j < ny; ++j) {
      out[ptr++] = row[j];
    }
  }
}

function flatten3D (array, nx, ny, nz, out, ptr_) {
  var ptr = ptr_;
  for (var i = 0; i < nx; ++i) {
    var row = array[i];
    for (var j = 0; j < ny; ++j) {
      var col = row[j];
      for (var k = 0; k < nz; ++k) {
        out[ptr++] = col[k];
      }
    }
  }
}

function flattenRec (array, shape, level, out, ptr) {
  var stride = 1;
  for (var i = level + 1; i < shape.length; ++i) {
    stride *= shape[i];
  }
  var n = shape[level];
  if (shape.length - level === 4) {
    var nx = shape[level + 1];
    var ny = shape[level + 2];
    var nz = shape[level + 3];
    for (i = 0; i < n; ++i) {
      flatten3D(array[i], nx, ny, nz, out, ptr);
      ptr += stride;
    }
  } else {
    for (i = 0; i < n; ++i) {
      flattenRec(array[i], shape, level + 1, out, ptr);
      ptr += stride;
    }
  }
}

function flattenArray (array, shape, type, out_) {
  var sz = 1;
  if (shape.length) {
    for (var i = 0; i < shape.length; ++i) {
      sz *= shape[i];
    }
  } else {
    sz = 0;
  }
  var out = out_ || pool.allocType(type, sz);
  switch (shape.length) {
    case 0:
      break
    case 1:
      flatten1D(array, shape[0], out);
      break
    case 2:
      flatten2D(array, shape[0], shape[1], out);
      break
    case 3:
      flatten3D(array, shape[0], shape[1], shape[2], out, 0);
      break
    default:
      flattenRec(array, shape, 0, out, 0);
  }
  return out
}

function arrayShape$1 (array_) {
  var shape = [];
  for (var array = array_; array.length; array = array[0]) {
    shape.push(array.length);
  }
  return shape
}

var int8 = 5120;
var int16 = 5122;
var int32 = 5124;
var uint8 = 5121;
var uint16 = 5123;
var uint32 = 5125;
var float = 5126;
var float32 = 5126;
var glTypes = {
	int8: int8,
	int16: int16,
	int32: int32,
	uint8: uint8,
	uint16: uint16,
	uint32: uint32,
	float: float,
	float32: float32
};

var dynamic$1 = 35048;
var stream = 35040;
var usageTypes = {
	dynamic: dynamic$1,
	stream: stream,
	"static": 35044
};

var arrayFlatten = flattenUtils.flatten;
var arrayShape = flattenUtils.shape;

var GL_STATIC_DRAW = 0x88E4;
var GL_STREAM_DRAW = 0x88E0;

var GL_UNSIGNED_BYTE$1 = 5121;
var GL_FLOAT$1 = 5126;

var DTYPES_SIZES = [];
DTYPES_SIZES[5120] = 1; // int8
DTYPES_SIZES[5122] = 2; // int16
DTYPES_SIZES[5124] = 4; // int32
DTYPES_SIZES[5121] = 1; // uint8
DTYPES_SIZES[5123] = 2; // uint16
DTYPES_SIZES[5125] = 4; // uint32
DTYPES_SIZES[5126] = 4; // float32

function typedArrayCode (data) {
  return arrayTypes[Object.prototype.toString.call(data)] | 0
}

function copyArray (out, inp) {
  for (var i = 0; i < inp.length; ++i) {
    out[i] = inp[i];
  }
}

function transpose (
  result, data, shapeX, shapeY, strideX, strideY, offset) {
  var ptr = 0;
  for (var i = 0; i < shapeX; ++i) {
    for (var j = 0; j < shapeY; ++j) {
      result[ptr++] = data[strideX * i + strideY * j + offset];
    }
  }
}

function wrapBufferState (gl, stats, config) {
  var bufferCount = 0;
  var bufferSet = {};

  function REGLBuffer (type) {
    this.id = bufferCount++;
    this.buffer = gl.createBuffer();
    this.type = type;
    this.usage = GL_STATIC_DRAW;
    this.byteLength = 0;
    this.dimension = 1;
    this.dtype = GL_UNSIGNED_BYTE$1;

    this.persistentData = null;

    if (config.profile) {
      this.stats = {size: 0};
    }
  }

  REGLBuffer.prototype.bind = function () {
    gl.bindBuffer(this.type, this.buffer);
  };

  REGLBuffer.prototype.destroy = function () {
    destroy(this);
  };

  var streamPool = [];

  function createStream (type, data) {
    var buffer = streamPool.pop();
    if (!buffer) {
      buffer = new REGLBuffer(type);
    }
    buffer.bind();
    initBufferFromData(buffer, data, GL_STREAM_DRAW, 0, 1, false);
    return buffer
  }

  function destroyStream (stream$$1) {
    streamPool.push(stream$$1);
  }

  function initBufferFromTypedArray (buffer, data, usage) {
    buffer.byteLength = data.byteLength;
    gl.bufferData(buffer.type, data, usage);
  }

  function initBufferFromData (buffer, data, usage, dtype, dimension, persist) {
    var shape;
    buffer.usage = usage;
    if (Array.isArray(data)) {
      buffer.dtype = dtype || GL_FLOAT$1;
      if (data.length > 0) {
        var flatData;
        if (Array.isArray(data[0])) {
          shape = arrayShape(data);
          var dim = 1;
          for (var i = 1; i < shape.length; ++i) {
            dim *= shape[i];
          }
          buffer.dimension = dim;
          flatData = arrayFlatten(data, shape, buffer.dtype);
          initBufferFromTypedArray(buffer, flatData, usage);
          if (persist) {
            buffer.persistentData = flatData;
          } else {
            pool.freeType(flatData);
          }
        } else if (typeof data[0] === 'number') {
          buffer.dimension = dimension;
          var typedData = pool.allocType(buffer.dtype, data.length);
          copyArray(typedData, data);
          initBufferFromTypedArray(buffer, typedData, usage);
          if (persist) {
            buffer.persistentData = typedData;
          } else {
            pool.freeType(typedData);
          }
        } else if (isTypedArray(data[0])) {
          buffer.dimension = data[0].length;
          buffer.dtype = dtype || typedArrayCode(data[0]) || GL_FLOAT$1;
          flatData = arrayFlatten(
            data,
            [data.length, data[0].length],
            buffer.dtype);
          initBufferFromTypedArray(buffer, flatData, usage);
          if (persist) {
            buffer.persistentData = flatData;
          } else {
            pool.freeType(flatData);
          }
        } else {
          check$1.raise('invalid buffer data');
        }
      }
    } else if (isTypedArray(data)) {
      buffer.dtype = dtype || typedArrayCode(data);
      buffer.dimension = dimension;
      initBufferFromTypedArray(buffer, data, usage);
      if (persist) {
        buffer.persistentData = new Uint8Array(new Uint8Array(data.buffer));
      }
    } else if (isNDArrayLike(data)) {
      shape = data.shape;
      var stride = data.stride;
      var offset = data.offset;

      var shapeX = 0;
      var shapeY = 0;
      var strideX = 0;
      var strideY = 0;
      if (shape.length === 1) {
        shapeX = shape[0];
        shapeY = 1;
        strideX = stride[0];
        strideY = 0;
      } else if (shape.length === 2) {
        shapeX = shape[0];
        shapeY = shape[1];
        strideX = stride[0];
        strideY = stride[1];
      } else {
        check$1.raise('invalid shape');
      }

      buffer.dtype = dtype || typedArrayCode(data.data) || GL_FLOAT$1;
      buffer.dimension = shapeY;

      var transposeData = pool.allocType(buffer.dtype, shapeX * shapeY);
      transpose(transposeData,
        data.data,
        shapeX, shapeY,
        strideX, strideY,
        offset);
      initBufferFromTypedArray(buffer, transposeData, usage);
      if (persist) {
        buffer.persistentData = transposeData;
      } else {
        pool.freeType(transposeData);
      }
    } else {
      check$1.raise('invalid buffer data');
    }
  }

  function destroy (buffer) {
    stats.bufferCount--;

    var handle = buffer.buffer;
    check$1(handle, 'buffer must not be deleted already');
    gl.deleteBuffer(handle);
    buffer.buffer = null;
    delete bufferSet[buffer.id];
  }

  function createBuffer (options, type, deferInit, persistent) {
    stats.bufferCount++;

    var buffer = new REGLBuffer(type);
    bufferSet[buffer.id] = buffer;

    function reglBuffer (options) {
      var usage = GL_STATIC_DRAW;
      var data = null;
      var byteLength = 0;
      var dtype = 0;
      var dimension = 1;
      if (Array.isArray(options) ||
          isTypedArray(options) ||
          isNDArrayLike(options)) {
        data = options;
      } else if (typeof options === 'number') {
        byteLength = options | 0;
      } else if (options) {
        check$1.type(
          options, 'object',
          'buffer arguments must be an object, a number or an array');

        if ('data' in options) {
          check$1(
            data === null ||
            Array.isArray(data) ||
            isTypedArray(data) ||
            isNDArrayLike(data),
            'invalid data for buffer');
          data = options.data;
        }

        if ('usage' in options) {
          check$1.parameter(options.usage, usageTypes, 'invalid buffer usage');
          usage = usageTypes[options.usage];
        }

        if ('type' in options) {
          check$1.parameter(options.type, glTypes, 'invalid buffer type');
          dtype = glTypes[options.type];
        }

        if ('dimension' in options) {
          check$1.type(options.dimension, 'number', 'invalid dimension');
          dimension = options.dimension | 0;
        }

        if ('length' in options) {
          check$1.nni(byteLength, 'buffer length must be a nonnegative integer');
          byteLength = options.length | 0;
        }
      }

      buffer.bind();
      if (!data) {
        gl.bufferData(buffer.type, byteLength, usage);
        buffer.dtype = dtype || GL_UNSIGNED_BYTE$1;
        buffer.usage = usage;
        buffer.dimension = dimension;
        buffer.byteLength = byteLength;
      } else {
        initBufferFromData(buffer, data, usage, dtype, dimension, persistent);
      }

      if (config.profile) {
        buffer.stats.size = buffer.byteLength * DTYPES_SIZES[buffer.dtype];
      }

      return reglBuffer
    }

    function setSubData (data, offset) {
      check$1(offset + data.byteLength <= buffer.byteLength,
        'invalid buffer subdata call, buffer is too small. ' + ' Can\'t write data of size ' + data.byteLength + ' starting from offset ' + offset + ' to a buffer of size ' + buffer.byteLength);

      gl.bufferSubData(buffer.type, offset, data);
    }

    function subdata (data, offset_) {
      var offset = (offset_ || 0) | 0;
      var shape;
      buffer.bind();
      if (Array.isArray(data)) {
        if (data.length > 0) {
          if (typeof data[0] === 'number') {
            var converted = pool.allocType(buffer.dtype, data.length);
            copyArray(converted, data);
            setSubData(converted, offset);
            pool.freeType(converted);
          } else if (Array.isArray(data[0]) || isTypedArray(data[0])) {
            shape = arrayShape(data);
            var flatData = arrayFlatten(data, shape, buffer.dtype);
            setSubData(flatData, offset);
            pool.freeType(flatData);
          } else {
            check$1.raise('invalid buffer data');
          }
        }
      } else if (isTypedArray(data)) {
        setSubData(data, offset);
      } else if (isNDArrayLike(data)) {
        shape = data.shape;
        var stride = data.stride;

        var shapeX = 0;
        var shapeY = 0;
        var strideX = 0;
        var strideY = 0;
        if (shape.length === 1) {
          shapeX = shape[0];
          shapeY = 1;
          strideX = stride[0];
          strideY = 0;
        } else if (shape.length === 2) {
          shapeX = shape[0];
          shapeY = shape[1];
          strideX = stride[0];
          strideY = stride[1];
        } else {
          check$1.raise('invalid shape');
        }
        var dtype = Array.isArray(data.data)
          ? buffer.dtype
          : typedArrayCode(data.data);

        var transposeData = pool.allocType(dtype, shapeX * shapeY);
        transpose(transposeData,
          data.data,
          shapeX, shapeY,
          strideX, strideY,
          data.offset);
        setSubData(transposeData, offset);
        pool.freeType(transposeData);
      } else {
        check$1.raise('invalid data for buffer subdata');
      }
      return reglBuffer
    }

    if (!deferInit) {
      reglBuffer(options);
    }

    reglBuffer._reglType = 'buffer';
    reglBuffer._buffer = buffer;
    reglBuffer.subdata = subdata;
    if (config.profile) {
      reglBuffer.stats = buffer.stats;
    }
    reglBuffer.destroy = function () { destroy(buffer); };

    return reglBuffer
  }

  function restoreBuffers () {
    values(bufferSet).forEach(function (buffer) {
      buffer.buffer = gl.createBuffer();
      gl.bindBuffer(buffer.type, buffer.buffer);
      gl.bufferData(
        buffer.type, buffer.persistentData || buffer.byteLength, buffer.usage);
    });
  }

  if (config.profile) {
    stats.getTotalBufferSize = function () {
      var total = 0;
      // TODO: Right now, the streams are not part of the total count.
      Object.keys(bufferSet).forEach(function (key) {
        total += bufferSet[key].stats.size;
      });
      return total
    };
  }

  return {
    create: createBuffer,

    createStream: createStream,
    destroyStream: destroyStream,

    clear: function () {
      values(bufferSet).forEach(destroy);
      streamPool.forEach(destroy);
    },

    getBuffer: function (wrapper) {
      if (wrapper && wrapper._buffer instanceof REGLBuffer) {
        return wrapper._buffer
      }
      return null
    },

    restore: restoreBuffers,

    _initBuffer: initBufferFromData
  }
}

var points = 0;
var point = 0;
var lines = 1;
var line = 1;
var triangles = 4;
var triangle = 4;
var primTypes = {
	points: points,
	point: point,
	lines: lines,
	line: line,
	triangles: triangles,
	triangle: triangle,
	"line loop": 2,
	"line strip": 3,
	"triangle strip": 5,
	"triangle fan": 6
};

var GL_POINTS = 0;
var GL_LINES = 1;
var GL_TRIANGLES = 4;

var GL_BYTE$2 = 5120;
var GL_UNSIGNED_BYTE$3 = 5121;
var GL_SHORT$2 = 5122;
var GL_UNSIGNED_SHORT$2 = 5123;
var GL_INT$2 = 5124;
var GL_UNSIGNED_INT$2 = 5125;

var GL_ELEMENT_ARRAY_BUFFER = 34963;

var GL_STREAM_DRAW$1 = 0x88E0;
var GL_STATIC_DRAW$1 = 0x88E4;

function wrapElementsState (gl, extensions, bufferState, stats) {
  var elementSet = {};
  var elementCount = 0;

  var elementTypes = {
    'uint8': GL_UNSIGNED_BYTE$3,
    'uint16': GL_UNSIGNED_SHORT$2
  };

  if (extensions.oes_element_index_uint) {
    elementTypes.uint32 = GL_UNSIGNED_INT$2;
  }

  function REGLElementBuffer (buffer) {
    this.id = elementCount++;
    elementSet[this.id] = this;
    this.buffer = buffer;
    this.primType = GL_TRIANGLES;
    this.vertCount = 0;
    this.type = 0;
  }

  REGLElementBuffer.prototype.bind = function () {
    this.buffer.bind();
  };

  var bufferPool = [];

  function createElementStream (data) {
    var result = bufferPool.pop();
    if (!result) {
      result = new REGLElementBuffer(bufferState.create(
        null,
        GL_ELEMENT_ARRAY_BUFFER,
        true,
        false)._buffer);
    }
    initElements(result, data, GL_STREAM_DRAW$1, -1, -1, 0, 0);
    return result
  }

  function destroyElementStream (elements) {
    bufferPool.push(elements);
  }

  function initElements (
    elements,
    data,
    usage,
    prim,
    count,
    byteLength,
    type) {
    elements.buffer.bind();
    if (data) {
      var predictedType = type;
      if (!type && (
          !isTypedArray(data) ||
         (isNDArrayLike(data) && !isTypedArray(data.data)))) {
        predictedType = extensions.oes_element_index_uint
          ? GL_UNSIGNED_INT$2
          : GL_UNSIGNED_SHORT$2;
      }
      bufferState._initBuffer(
        elements.buffer,
        data,
        usage,
        predictedType,
        3);
    } else {
      gl.bufferData(GL_ELEMENT_ARRAY_BUFFER, byteLength, usage);
      elements.buffer.dtype = dtype || GL_UNSIGNED_BYTE$3;
      elements.buffer.usage = usage;
      elements.buffer.dimension = 3;
      elements.buffer.byteLength = byteLength;
    }

    var dtype = type;
    if (!type) {
      switch (elements.buffer.dtype) {
        case GL_UNSIGNED_BYTE$3:
        case GL_BYTE$2:
          dtype = GL_UNSIGNED_BYTE$3;
          break

        case GL_UNSIGNED_SHORT$2:
        case GL_SHORT$2:
          dtype = GL_UNSIGNED_SHORT$2;
          break

        case GL_UNSIGNED_INT$2:
        case GL_INT$2:
          dtype = GL_UNSIGNED_INT$2;
          break

        default:
          check$1.raise('unsupported type for element array');
      }
      elements.buffer.dtype = dtype;
    }
    elements.type = dtype;

    // Check oes_element_index_uint extension
    check$1(
      dtype !== GL_UNSIGNED_INT$2 ||
      !!extensions.oes_element_index_uint,
      '32 bit element buffers not supported, enable oes_element_index_uint first');

    // try to guess default primitive type and arguments
    var vertCount = count;
    if (vertCount < 0) {
      vertCount = elements.buffer.byteLength;
      if (dtype === GL_UNSIGNED_SHORT$2) {
        vertCount >>= 1;
      } else if (dtype === GL_UNSIGNED_INT$2) {
        vertCount >>= 2;
      }
    }
    elements.vertCount = vertCount;

    // try to guess primitive type from cell dimension
    var primType = prim;
    if (prim < 0) {
      primType = GL_TRIANGLES;
      var dimension = elements.buffer.dimension;
      if (dimension === 1) primType = GL_POINTS;
      if (dimension === 2) primType = GL_LINES;
      if (dimension === 3) primType = GL_TRIANGLES;
    }
    elements.primType = primType;
  }

  function destroyElements (elements) {
    stats.elementsCount--;

    check$1(elements.buffer !== null, 'must not double destroy elements');
    delete elementSet[elements.id];
    elements.buffer.destroy();
    elements.buffer = null;
  }

  function createElements (options, persistent) {
    var buffer = bufferState.create(null, GL_ELEMENT_ARRAY_BUFFER, true);
    var elements = new REGLElementBuffer(buffer._buffer);
    stats.elementsCount++;

    function reglElements (options) {
      if (!options) {
        buffer();
        elements.primType = GL_TRIANGLES;
        elements.vertCount = 0;
        elements.type = GL_UNSIGNED_BYTE$3;
      } else if (typeof options === 'number') {
        buffer(options);
        elements.primType = GL_TRIANGLES;
        elements.vertCount = options | 0;
        elements.type = GL_UNSIGNED_BYTE$3;
      } else {
        var data = null;
        var usage = GL_STATIC_DRAW$1;
        var primType = -1;
        var vertCount = -1;
        var byteLength = 0;
        var dtype = 0;
        if (Array.isArray(options) ||
            isTypedArray(options) ||
            isNDArrayLike(options)) {
          data = options;
        } else {
          check$1.type(options, 'object', 'invalid arguments for elements');
          if ('data' in options) {
            data = options.data;
            check$1(
                Array.isArray(data) ||
                isTypedArray(data) ||
                isNDArrayLike(data),
                'invalid data for element buffer');
          }
          if ('usage' in options) {
            check$1.parameter(
              options.usage,
              usageTypes,
              'invalid element buffer usage');
            usage = usageTypes[options.usage];
          }
          if ('primitive' in options) {
            check$1.parameter(
              options.primitive,
              primTypes,
              'invalid element buffer primitive');
            primType = primTypes[options.primitive];
          }
          if ('count' in options) {
            check$1(
              typeof options.count === 'number' && options.count >= 0,
              'invalid vertex count for elements');
            vertCount = options.count | 0;
          }
          if ('type' in options) {
            check$1.parameter(
              options.type,
              elementTypes,
              'invalid buffer type');
            dtype = elementTypes[options.type];
          }
          if ('length' in options) {
            byteLength = options.length | 0;
          } else {
            byteLength = vertCount;
            if (dtype === GL_UNSIGNED_SHORT$2 || dtype === GL_SHORT$2) {
              byteLength *= 2;
            } else if (dtype === GL_UNSIGNED_INT$2 || dtype === GL_INT$2) {
              byteLength *= 4;
            }
          }
        }
        initElements(
          elements,
          data,
          usage,
          primType,
          vertCount,
          byteLength,
          dtype);
      }

      return reglElements
    }

    reglElements(options);

    reglElements._reglType = 'elements';
    reglElements._elements = elements;
    reglElements.subdata = function (data, offset) {
      buffer.subdata(data, offset);
      return reglElements
    };
    reglElements.destroy = function () {
      destroyElements(elements);
    };

    return reglElements
  }

  return {
    create: createElements,
    createStream: createElementStream,
    destroyStream: destroyElementStream,
    getElements: function (elements) {
      if (typeof elements === 'function' &&
          elements._elements instanceof REGLElementBuffer) {
        return elements._elements
      }
      return null
    },
    clear: function () {
      values(elementSet).forEach(destroyElements);
    }
  }
}

var FLOAT = new Float32Array(1);
var INT = new Uint32Array(FLOAT.buffer);

var GL_UNSIGNED_SHORT$4 = 5123;

function convertToHalfFloat (array) {
  var ushorts = pool.allocType(GL_UNSIGNED_SHORT$4, array.length);

  for (var i = 0; i < array.length; ++i) {
    if (isNaN(array[i])) {
      ushorts[i] = 0xffff;
    } else if (array[i] === Infinity) {
      ushorts[i] = 0x7c00;
    } else if (array[i] === -Infinity) {
      ushorts[i] = 0xfc00;
    } else {
      FLOAT[0] = array[i];
      var x = INT[0];

      var sgn = (x >>> 31) << 15;
      var exp = ((x << 1) >>> 24) - 127;
      var frac = (x >> 13) & ((1 << 10) - 1);

      if (exp < -24) {
        // round non-representable denormals to 0
        ushorts[i] = sgn;
      } else if (exp < -14) {
        // handle denormals
        var s = -14 - exp;
        ushorts[i] = sgn + ((frac + (1 << 10)) >> s);
      } else if (exp > 15) {
        // round overflow to +/- Infinity
        ushorts[i] = sgn + 0x7c00;
      } else {
        // otherwise convert directly
        ushorts[i] = sgn + ((exp + 15) << 10) + frac;
      }
    }
  }

  return ushorts
}

function isArrayLike (s) {
  return Array.isArray(s) || isTypedArray(s)
}

var GL_COMPRESSED_TEXTURE_FORMATS = 0x86A3;

var GL_TEXTURE_2D = 0x0DE1;
var GL_TEXTURE_CUBE_MAP = 0x8513;
var GL_TEXTURE_CUBE_MAP_POSITIVE_X = 0x8515;

var GL_RGBA = 0x1908;
var GL_ALPHA = 0x1906;
var GL_RGB = 0x1907;
var GL_LUMINANCE = 0x1909;
var GL_LUMINANCE_ALPHA = 0x190A;

var GL_RGBA4 = 0x8056;
var GL_RGB5_A1 = 0x8057;
var GL_RGB565 = 0x8D62;

var GL_UNSIGNED_SHORT_4_4_4_4$1 = 0x8033;
var GL_UNSIGNED_SHORT_5_5_5_1$1 = 0x8034;
var GL_UNSIGNED_SHORT_5_6_5$1 = 0x8363;
var GL_UNSIGNED_INT_24_8_WEBGL$1 = 0x84FA;

var GL_DEPTH_COMPONENT = 0x1902;
var GL_DEPTH_STENCIL = 0x84F9;

var GL_SRGB_EXT = 0x8C40;
var GL_SRGB_ALPHA_EXT = 0x8C42;

var GL_HALF_FLOAT_OES$1 = 0x8D61;

var GL_COMPRESSED_RGB_S3TC_DXT1_EXT = 0x83F0;
var GL_COMPRESSED_RGBA_S3TC_DXT1_EXT = 0x83F1;
var GL_COMPRESSED_RGBA_S3TC_DXT3_EXT = 0x83F2;
var GL_COMPRESSED_RGBA_S3TC_DXT5_EXT = 0x83F3;

var GL_COMPRESSED_RGB_ATC_WEBGL = 0x8C92;
var GL_COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL = 0x8C93;
var GL_COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL = 0x87EE;

var GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG = 0x8C00;
var GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG = 0x8C01;
var GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG = 0x8C02;
var GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG = 0x8C03;

var GL_COMPRESSED_RGB_ETC1_WEBGL = 0x8D64;

var GL_UNSIGNED_BYTE$4 = 0x1401;
var GL_UNSIGNED_SHORT$3 = 0x1403;
var GL_UNSIGNED_INT$3 = 0x1405;
var GL_FLOAT$3 = 0x1406;

var GL_TEXTURE_WRAP_S = 0x2802;
var GL_TEXTURE_WRAP_T = 0x2803;

var GL_REPEAT = 0x2901;
var GL_CLAMP_TO_EDGE$1 = 0x812F;
var GL_MIRRORED_REPEAT = 0x8370;

var GL_TEXTURE_MAG_FILTER = 0x2800;
var GL_TEXTURE_MIN_FILTER = 0x2801;

var GL_NEAREST$1 = 0x2600;
var GL_LINEAR = 0x2601;
var GL_NEAREST_MIPMAP_NEAREST$1 = 0x2700;
var GL_LINEAR_MIPMAP_NEAREST$1 = 0x2701;
var GL_NEAREST_MIPMAP_LINEAR$1 = 0x2702;
var GL_LINEAR_MIPMAP_LINEAR$1 = 0x2703;

var GL_GENERATE_MIPMAP_HINT = 0x8192;
var GL_DONT_CARE = 0x1100;
var GL_FASTEST = 0x1101;
var GL_NICEST = 0x1102;

var GL_TEXTURE_MAX_ANISOTROPY_EXT = 0x84FE;

var GL_UNPACK_ALIGNMENT = 0x0CF5;
var GL_UNPACK_FLIP_Y_WEBGL = 0x9240;
var GL_UNPACK_PREMULTIPLY_ALPHA_WEBGL = 0x9241;
var GL_UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243;

var GL_BROWSER_DEFAULT_WEBGL = 0x9244;

var GL_TEXTURE0 = 0x84C0;

var MIPMAP_FILTERS = [
  GL_NEAREST_MIPMAP_NEAREST$1,
  GL_NEAREST_MIPMAP_LINEAR$1,
  GL_LINEAR_MIPMAP_NEAREST$1,
  GL_LINEAR_MIPMAP_LINEAR$1
];

var CHANNELS_FORMAT = [
  0,
  GL_LUMINANCE,
  GL_LUMINANCE_ALPHA,
  GL_RGB,
  GL_RGBA
];

var FORMAT_CHANNELS = {};
FORMAT_CHANNELS[GL_LUMINANCE] =
FORMAT_CHANNELS[GL_ALPHA] =
FORMAT_CHANNELS[GL_DEPTH_COMPONENT] = 1;
FORMAT_CHANNELS[GL_DEPTH_STENCIL] =
FORMAT_CHANNELS[GL_LUMINANCE_ALPHA] = 2;
FORMAT_CHANNELS[GL_RGB] =
FORMAT_CHANNELS[GL_SRGB_EXT] = 3;
FORMAT_CHANNELS[GL_RGBA] =
FORMAT_CHANNELS[GL_SRGB_ALPHA_EXT] = 4;

function objectName (str) {
  return '[object ' + str + ']'
}

var CANVAS_CLASS = objectName('HTMLCanvasElement');
var CONTEXT2D_CLASS = objectName('CanvasRenderingContext2D');
var IMAGE_CLASS = objectName('HTMLImageElement');
var VIDEO_CLASS = objectName('HTMLVideoElement');

var PIXEL_CLASSES = Object.keys(arrayTypes).concat([
  CANVAS_CLASS,
  CONTEXT2D_CLASS,
  IMAGE_CLASS,
  VIDEO_CLASS
]);

// for every texture type, store
// the size in bytes.
var TYPE_SIZES = [];
TYPE_SIZES[GL_UNSIGNED_BYTE$4] = 1;
TYPE_SIZES[GL_FLOAT$3] = 4;
TYPE_SIZES[GL_HALF_FLOAT_OES$1] = 2;

TYPE_SIZES[GL_UNSIGNED_SHORT$3] = 2;
TYPE_SIZES[GL_UNSIGNED_INT$3] = 4;

var FORMAT_SIZES_SPECIAL = [];
FORMAT_SIZES_SPECIAL[GL_RGBA4] = 2;
FORMAT_SIZES_SPECIAL[GL_RGB5_A1] = 2;
FORMAT_SIZES_SPECIAL[GL_RGB565] = 2;
FORMAT_SIZES_SPECIAL[GL_DEPTH_STENCIL] = 4;

FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGB_S3TC_DXT1_EXT] = 0.5;
FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGBA_S3TC_DXT1_EXT] = 0.5;
FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGBA_S3TC_DXT3_EXT] = 1;
FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGBA_S3TC_DXT5_EXT] = 1;

FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGB_ATC_WEBGL] = 0.5;
FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL] = 1;
FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL] = 1;

FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG] = 0.5;
FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG] = 0.25;
FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG] = 0.5;
FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG] = 0.25;

FORMAT_SIZES_SPECIAL[GL_COMPRESSED_RGB_ETC1_WEBGL] = 0.5;

function isNumericArray (arr) {
  return (
    Array.isArray(arr) &&
    (arr.length === 0 ||
    typeof arr[0] === 'number'))
}

function isRectArray (arr) {
  if (!Array.isArray(arr)) {
    return false
  }
  var width = arr.length;
  if (width === 0 || !isArrayLike(arr[0])) {
    return false
  }
  return true
}

function classString (x) {
  return Object.prototype.toString.call(x)
}

function isCanvasElement (object) {
  return classString(object) === CANVAS_CLASS
}

function isContext2D (object) {
  return classString(object) === CONTEXT2D_CLASS
}

function isImageElement (object) {
  return classString(object) === IMAGE_CLASS
}

function isVideoElement (object) {
  return classString(object) === VIDEO_CLASS
}

function isPixelData (object) {
  if (!object) {
    return false
  }
  var className = classString(object);
  if (PIXEL_CLASSES.indexOf(className) >= 0) {
    return true
  }
  return (
    isNumericArray(object) ||
    isRectArray(object) ||
    isNDArrayLike(object))
}

function typedArrayCode$1 (data) {
  return arrayTypes[Object.prototype.toString.call(data)] | 0
}

function convertData (result, data) {
  var n = data.length;
  switch (result.type) {
    case GL_UNSIGNED_BYTE$4:
    case GL_UNSIGNED_SHORT$3:
    case GL_UNSIGNED_INT$3:
    case GL_FLOAT$3:
      var converted = pool.allocType(result.type, n);
      converted.set(data);
      result.data = converted;
      break

    case GL_HALF_FLOAT_OES$1:
      result.data = convertToHalfFloat(data);
      break

    default:
      check$1.raise('unsupported texture type, must specify a typed array');
  }
}

function preConvert (image, n) {
  return pool.allocType(
    image.type === GL_HALF_FLOAT_OES$1
      ? GL_FLOAT$3
      : image.type, n)
}

function postConvert (image, data) {
  if (image.type === GL_HALF_FLOAT_OES$1) {
    image.data = convertToHalfFloat(data);
    pool.freeType(data);
  } else {
    image.data = data;
  }
}

function transposeData (image, array, strideX, strideY, strideC, offset) {
  var w = image.width;
  var h = image.height;
  var c = image.channels;
  var n = w * h * c;
  var data = preConvert(image, n);

  var p = 0;
  for (var i = 0; i < h; ++i) {
    for (var j = 0; j < w; ++j) {
      for (var k = 0; k < c; ++k) {
        data[p++] = array[strideX * j + strideY * i + strideC * k + offset];
      }
    }
  }

  postConvert(image, data);
}

function getTextureSize (format, type, width, height, isMipmap, isCube) {
  var s;
  if (typeof FORMAT_SIZES_SPECIAL[format] !== 'undefined') {
    // we have a special array for dealing with weird color formats such as RGB5A1
    s = FORMAT_SIZES_SPECIAL[format];
  } else {
    s = FORMAT_CHANNELS[format] * TYPE_SIZES[type];
  }

  if (isCube) {
    s *= 6;
  }

  if (isMipmap) {
    // compute the total size of all the mipmaps.
    var total = 0;

    var w = width;
    while (w >= 1) {
      // we can only use mipmaps on a square image,
      // so we can simply use the width and ignore the height:
      total += s * w * w;
      w /= 2;
    }
    return total
  } else {
    return s * width * height
  }
}

function createTextureSet (
  gl, extensions, limits, reglPoll, contextState, stats, config) {
  // -------------------------------------------------------
  // Initialize constants and parameter tables here
  // -------------------------------------------------------
  var mipmapHint = {
    "don't care": GL_DONT_CARE,
    'dont care': GL_DONT_CARE,
    'nice': GL_NICEST,
    'fast': GL_FASTEST
  };

  var wrapModes = {
    'repeat': GL_REPEAT,
    'clamp': GL_CLAMP_TO_EDGE$1,
    'mirror': GL_MIRRORED_REPEAT
  };

  var magFilters = {
    'nearest': GL_NEAREST$1,
    'linear': GL_LINEAR
  };

  var minFilters = extend({
    'mipmap': GL_LINEAR_MIPMAP_LINEAR$1,
    'nearest mipmap nearest': GL_NEAREST_MIPMAP_NEAREST$1,
    'linear mipmap nearest': GL_LINEAR_MIPMAP_NEAREST$1,
    'nearest mipmap linear': GL_NEAREST_MIPMAP_LINEAR$1,
    'linear mipmap linear': GL_LINEAR_MIPMAP_LINEAR$1
  }, magFilters);

  var colorSpace = {
    'none': 0,
    'browser': GL_BROWSER_DEFAULT_WEBGL
  };

  var textureTypes = {
    'uint8': GL_UNSIGNED_BYTE$4,
    'rgba4': GL_UNSIGNED_SHORT_4_4_4_4$1,
    'rgb565': GL_UNSIGNED_SHORT_5_6_5$1,
    'rgb5 a1': GL_UNSIGNED_SHORT_5_5_5_1$1
  };

  var textureFormats = {
    'alpha': GL_ALPHA,
    'luminance': GL_LUMINANCE,
    'luminance alpha': GL_LUMINANCE_ALPHA,
    'rgb': GL_RGB,
    'rgba': GL_RGBA,
    'rgba4': GL_RGBA4,
    'rgb5 a1': GL_RGB5_A1,
    'rgb565': GL_RGB565
  };

  var compressedTextureFormats = {};

  if (extensions.ext_srgb) {
    textureFormats.srgb = GL_SRGB_EXT;
    textureFormats.srgba = GL_SRGB_ALPHA_EXT;
  }

  if (extensions.oes_texture_float) {
    textureTypes.float32 = textureTypes.float = GL_FLOAT$3;
  }

  if (extensions.oes_texture_half_float) {
    textureTypes['float16'] = textureTypes['half float'] = GL_HALF_FLOAT_OES$1;
  }

  if (extensions.webgl_depth_texture) {
    extend(textureFormats, {
      'depth': GL_DEPTH_COMPONENT,
      'depth stencil': GL_DEPTH_STENCIL
    });

    extend(textureTypes, {
      'uint16': GL_UNSIGNED_SHORT$3,
      'uint32': GL_UNSIGNED_INT$3,
      'depth stencil': GL_UNSIGNED_INT_24_8_WEBGL$1
    });
  }

  if (extensions.webgl_compressed_texture_s3tc) {
    extend(compressedTextureFormats, {
      'rgb s3tc dxt1': GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
      'rgba s3tc dxt1': GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,
      'rgba s3tc dxt3': GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
      'rgba s3tc dxt5': GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
    });
  }

  if (extensions.webgl_compressed_texture_atc) {
    extend(compressedTextureFormats, {
      'rgb atc': GL_COMPRESSED_RGB_ATC_WEBGL,
      'rgba atc explicit alpha': GL_COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL,
      'rgba atc interpolated alpha': GL_COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL
    });
  }

  if (extensions.webgl_compressed_texture_pvrtc) {
    extend(compressedTextureFormats, {
      'rgb pvrtc 4bppv1': GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG,
      'rgb pvrtc 2bppv1': GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG,
      'rgba pvrtc 4bppv1': GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG,
      'rgba pvrtc 2bppv1': GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG
    });
  }

  if (extensions.webgl_compressed_texture_etc1) {
    compressedTextureFormats['rgb etc1'] = GL_COMPRESSED_RGB_ETC1_WEBGL;
  }

  // Copy over all texture formats
  var supportedCompressedFormats = Array.prototype.slice.call(
    gl.getParameter(GL_COMPRESSED_TEXTURE_FORMATS));
  Object.keys(compressedTextureFormats).forEach(function (name) {
    var format = compressedTextureFormats[name];
    if (supportedCompressedFormats.indexOf(format) >= 0) {
      textureFormats[name] = format;
    }
  });

  var supportedFormats = Object.keys(textureFormats);
  limits.textureFormats = supportedFormats;

  // associate with every format string its
  // corresponding GL-value.
  var textureFormatsInvert = [];
  Object.keys(textureFormats).forEach(function (key) {
    var val = textureFormats[key];
    textureFormatsInvert[val] = key;
  });

  // associate with every type string its
  // corresponding GL-value.
  var textureTypesInvert = [];
  Object.keys(textureTypes).forEach(function (key) {
    var val = textureTypes[key];
    textureTypesInvert[val] = key;
  });

  var magFiltersInvert = [];
  Object.keys(magFilters).forEach(function (key) {
    var val = magFilters[key];
    magFiltersInvert[val] = key;
  });

  var minFiltersInvert = [];
  Object.keys(minFilters).forEach(function (key) {
    var val = minFilters[key];
    minFiltersInvert[val] = key;
  });

  var wrapModesInvert = [];
  Object.keys(wrapModes).forEach(function (key) {
    var val = wrapModes[key];
    wrapModesInvert[val] = key;
  });

  // colorFormats[] gives the format (channels) associated to an
  // internalformat
  var colorFormats = supportedFormats.reduce(function (color, key) {
    var glenum = textureFormats[key];
    if (glenum === GL_LUMINANCE ||
        glenum === GL_ALPHA ||
        glenum === GL_LUMINANCE ||
        glenum === GL_LUMINANCE_ALPHA ||
        glenum === GL_DEPTH_COMPONENT ||
        glenum === GL_DEPTH_STENCIL) {
      color[glenum] = glenum;
    } else if (glenum === GL_RGB5_A1 || key.indexOf('rgba') >= 0) {
      color[glenum] = GL_RGBA;
    } else {
      color[glenum] = GL_RGB;
    }
    return color
  }, {});

  function TexFlags () {
    // format info
    this.internalformat = GL_RGBA;
    this.format = GL_RGBA;
    this.type = GL_UNSIGNED_BYTE$4;
    this.compressed = false;

    // pixel storage
    this.premultiplyAlpha = false;
    this.flipY = false;
    this.unpackAlignment = 1;
    this.colorSpace = 0;

    // shape info
    this.width = 0;
    this.height = 0;
    this.channels = 0;
  }

  function copyFlags (result, other) {
    result.internalformat = other.internalformat;
    result.format = other.format;
    result.type = other.type;
    result.compressed = other.compressed;

    result.premultiplyAlpha = other.premultiplyAlpha;
    result.flipY = other.flipY;
    result.unpackAlignment = other.unpackAlignment;
    result.colorSpace = other.colorSpace;

    result.width = other.width;
    result.height = other.height;
    result.channels = other.channels;
  }

  function parseFlags (flags, options) {
    if (typeof options !== 'object' || !options) {
      return
    }

    if ('premultiplyAlpha' in options) {
      check$1.type(options.premultiplyAlpha, 'boolean',
        'invalid premultiplyAlpha');
      flags.premultiplyAlpha = options.premultiplyAlpha;
    }

    if ('flipY' in options) {
      check$1.type(options.flipY, 'boolean',
        'invalid texture flip');
      flags.flipY = options.flipY;
    }

    if ('alignment' in options) {
      check$1.oneOf(options.alignment, [1, 2, 4, 8],
        'invalid texture unpack alignment');
      flags.unpackAlignment = options.alignment;
    }

    if ('colorSpace' in options) {
      check$1.parameter(options.colorSpace, colorSpace,
        'invalid colorSpace');
      flags.colorSpace = colorSpace[options.colorSpace];
    }

    if ('type' in options) {
      var type = options.type;
      check$1(extensions.oes_texture_float ||
        !(type === 'float' || type === 'float32'),
        'you must enable the OES_texture_float extension in order to use floating point textures.');
      check$1(extensions.oes_texture_half_float ||
        !(type === 'half float' || type === 'float16'),
        'you must enable the OES_texture_half_float extension in order to use 16-bit floating point textures.');
      check$1(extensions.webgl_depth_texture ||
        !(type === 'uint16' || type === 'uint32' || type === 'depth stencil'),
        'you must enable the WEBGL_depth_texture extension in order to use depth/stencil textures.');
      check$1.parameter(type, textureTypes,
        'invalid texture type');
      flags.type = textureTypes[type];
    }

    var w = flags.width;
    var h = flags.height;
    var c = flags.channels;
    var hasChannels = false;
    if ('shape' in options) {
      check$1(Array.isArray(options.shape) && options.shape.length >= 2,
        'shape must be an array');
      w = options.shape[0];
      h = options.shape[1];
      if (options.shape.length === 3) {
        c = options.shape[2];
        check$1(c > 0 && c <= 4, 'invalid number of channels');
        hasChannels = true;
      }
      check$1(w >= 0 && w <= limits.maxTextureSize, 'invalid width');
      check$1(h >= 0 && h <= limits.maxTextureSize, 'invalid height');
    } else {
      if ('radius' in options) {
        w = h = options.radius;
        check$1(w >= 0 && w <= limits.maxTextureSize, 'invalid radius');
      }
      if ('width' in options) {
        w = options.width;
        check$1(w >= 0 && w <= limits.maxTextureSize, 'invalid width');
      }
      if ('height' in options) {
        h = options.height;
        check$1(h >= 0 && h <= limits.maxTextureSize, 'invalid height');
      }
      if ('channels' in options) {
        c = options.channels;
        check$1(c > 0 && c <= 4, 'invalid number of channels');
        hasChannels = true;
      }
    }
    flags.width = w | 0;
    flags.height = h | 0;
    flags.channels = c | 0;

    var hasFormat = false;
    if ('format' in options) {
      var formatStr = options.format;
      check$1(extensions.webgl_depth_texture ||
        !(formatStr === 'depth' || formatStr === 'depth stencil'),
        'you must enable the WEBGL_depth_texture extension in order to use depth/stencil textures.');
      check$1.parameter(formatStr, textureFormats,
        'invalid texture format');
      var internalformat = flags.internalformat = textureFormats[formatStr];
      flags.format = colorFormats[internalformat];
      if (formatStr in textureTypes) {
        if (!('type' in options)) {
          flags.type = textureTypes[formatStr];
        }
      }
      if (formatStr in compressedTextureFormats) {
        flags.compressed = true;
      }
      hasFormat = true;
    }

    // Reconcile channels and format
    if (!hasChannels && hasFormat) {
      flags.channels = FORMAT_CHANNELS[flags.format];
    } else if (hasChannels && !hasFormat) {
      if (flags.channels !== CHANNELS_FORMAT[flags.format]) {
        flags.format = flags.internalformat = CHANNELS_FORMAT[flags.channels];
      }
    } else if (hasFormat && hasChannels) {
      check$1(
        flags.channels === FORMAT_CHANNELS[flags.format],
        'number of channels inconsistent with specified format');
    }
  }

  function setFlags (flags) {
    gl.pixelStorei(GL_UNPACK_FLIP_Y_WEBGL, flags.flipY);
    gl.pixelStorei(GL_UNPACK_PREMULTIPLY_ALPHA_WEBGL, flags.premultiplyAlpha);
    gl.pixelStorei(GL_UNPACK_COLORSPACE_CONVERSION_WEBGL, flags.colorSpace);
    gl.pixelStorei(GL_UNPACK_ALIGNMENT, flags.unpackAlignment);
  }

  // -------------------------------------------------------
  // Tex image data
  // -------------------------------------------------------
  function TexImage () {
    TexFlags.call(this);

    this.xOffset = 0;
    this.yOffset = 0;

    // data
    this.data = null;
    this.needsFree = false;

    // html element
    this.element = null;

    // copyTexImage info
    this.needsCopy = false;
  }

  function parseImage (image, options) {
    var data = null;
    if (isPixelData(options)) {
      data = options;
    } else if (options) {
      check$1.type(options, 'object', 'invalid pixel data type');
      parseFlags(image, options);
      if ('x' in options) {
        image.xOffset = options.x | 0;
      }
      if ('y' in options) {
        image.yOffset = options.y | 0;
      }
      if (isPixelData(options.data)) {
        data = options.data;
      }
    }

    check$1(
      !image.compressed ||
      data instanceof Uint8Array,
      'compressed texture data must be stored in a uint8array');

    if (options.copy) {
      check$1(!data, 'can not specify copy and data field for the same texture');
      var viewW = contextState.viewportWidth;
      var viewH = contextState.viewportHeight;
      image.width = image.width || (viewW - image.xOffset);
      image.height = image.height || (viewH - image.yOffset);
      image.needsCopy = true;
      check$1(image.xOffset >= 0 && image.xOffset < viewW &&
            image.yOffset >= 0 && image.yOffset < viewH &&
            image.width > 0 && image.width <= viewW &&
            image.height > 0 && image.height <= viewH,
            'copy texture read out of bounds');
    } else if (!data) {
      image.width = image.width || 1;
      image.height = image.height || 1;
      image.channels = image.channels || 4;
    } else if (isTypedArray(data)) {
      image.channels = image.channels || 4;
      image.data = data;
      if (!('type' in options) && image.type === GL_UNSIGNED_BYTE$4) {
        image.type = typedArrayCode$1(data);
      }
    } else if (isNumericArray(data)) {
      image.channels = image.channels || 4;
      convertData(image, data);
      image.alignment = 1;
      image.needsFree = true;
    } else if (isNDArrayLike(data)) {
      var array = data.data;
      if (!Array.isArray(array) && image.type === GL_UNSIGNED_BYTE$4) {
        image.type = typedArrayCode$1(array);
      }
      var shape = data.shape;
      var stride = data.stride;
      var shapeX, shapeY, shapeC, strideX, strideY, strideC;
      if (shape.length === 3) {
        shapeC = shape[2];
        strideC = stride[2];
      } else {
        check$1(shape.length === 2, 'invalid ndarray pixel data, must be 2 or 3D');
        shapeC = 1;
        strideC = 1;
      }
      shapeX = shape[0];
      shapeY = shape[1];
      strideX = stride[0];
      strideY = stride[1];
      image.alignment = 1;
      image.width = shapeX;
      image.height = shapeY;
      image.channels = shapeC;
      image.format = image.internalformat = CHANNELS_FORMAT[shapeC];
      image.needsFree = true;
      transposeData(image, array, strideX, strideY, strideC, data.offset);
    } else if (isCanvasElement(data) || isContext2D(data)) {
      if (isCanvasElement(data)) {
        image.element = data;
      } else {
        image.element = data.canvas;
      }
      image.width = image.element.width;
      image.height = image.element.height;
      image.channels = 4;
    } else if (isImageElement(data)) {
      image.element = data;
      image.width = data.naturalWidth;
      image.height = data.naturalHeight;
      image.channels = 4;
    } else if (isVideoElement(data)) {
      image.element = data;
      image.width = data.videoWidth;
      image.height = data.videoHeight;
      image.channels = 4;
    } else if (isRectArray(data)) {
      var w = image.width || data[0].length;
      var h = image.height || data.length;
      var c = image.channels;
      if (isArrayLike(data[0][0])) {
        c = c || data[0][0].length;
      } else {
        c = c || 1;
      }
      var arrayShape = flattenUtils.shape(data);
      var n = 1;
      for (var dd = 0; dd < arrayShape.length; ++dd) {
        n *= arrayShape[dd];
      }
      var allocData = preConvert(image, n);
      flattenUtils.flatten(data, arrayShape, '', allocData);
      postConvert(image, allocData);
      image.alignment = 1;
      image.width = w;
      image.height = h;
      image.channels = c;
      image.format = image.internalformat = CHANNELS_FORMAT[c];
      image.needsFree = true;
    }

    if (image.type === GL_FLOAT$3) {
      check$1(limits.extensions.indexOf('oes_texture_float') >= 0,
        'oes_texture_float extension not enabled');
    } else if (image.type === GL_HALF_FLOAT_OES$1) {
      check$1(limits.extensions.indexOf('oes_texture_half_float') >= 0,
        'oes_texture_half_float extension not enabled');
    }

    // do compressed texture  validation here.
  }

  function setImage (info, target, miplevel) {
    var element = info.element;
    var data = info.data;
    var internalformat = info.internalformat;
    var format = info.format;
    var type = info.type;
    var width = info.width;
    var height = info.height;

    setFlags(info);

    if (element) {
      gl.texImage2D(target, miplevel, format, format, type, element);
    } else if (info.compressed) {
      gl.compressedTexImage2D(target, miplevel, internalformat, width, height, 0, data);
    } else if (info.needsCopy) {
      reglPoll();
      gl.copyTexImage2D(
        target, miplevel, format, info.xOffset, info.yOffset, width, height, 0);
    } else {
      gl.texImage2D(
        target, miplevel, format, width, height, 0, format, type, data);
    }
  }

  function setSubImage (info, target, x, y, miplevel) {
    var element = info.element;
    var data = info.data;
    var internalformat = info.internalformat;
    var format = info.format;
    var type = info.type;
    var width = info.width;
    var height = info.height;

    setFlags(info);

    if (element) {
      gl.texSubImage2D(
        target, miplevel, x, y, format, type, element);
    } else if (info.compressed) {
      gl.compressedTexSubImage2D(
        target, miplevel, x, y, internalformat, width, height, data);
    } else if (info.needsCopy) {
      reglPoll();
      gl.copyTexSubImage2D(
        target, miplevel, x, y, info.xOffset, info.yOffset, width, height);
    } else {
      gl.texSubImage2D(
        target, miplevel, x, y, width, height, format, type, data);
    }
  }

  // texImage pool
  var imagePool = [];

  function allocImage () {
    return imagePool.pop() || new TexImage()
  }

  function freeImage (image) {
    if (image.needsFree) {
      pool.freeType(image.data);
    }
    TexImage.call(image);
    imagePool.push(image);
  }

  // -------------------------------------------------------
  // Mip map
  // -------------------------------------------------------
  function MipMap () {
    TexFlags.call(this);

    this.genMipmaps = false;
    this.mipmapHint = GL_DONT_CARE;
    this.mipmask = 0;
    this.images = Array(16);
  }

  function parseMipMapFromShape (mipmap, width, height) {
    var img = mipmap.images[0] = allocImage();
    mipmap.mipmask = 1;
    img.width = mipmap.width = width;
    img.height = mipmap.height = height;
    img.channels = mipmap.channels = 4;
  }

  function parseMipMapFromObject (mipmap, options) {
    var imgData = null;
    if (isPixelData(options)) {
      imgData = mipmap.images[0] = allocImage();
      copyFlags(imgData, mipmap);
      parseImage(imgData, options);
      mipmap.mipmask = 1;
    } else {
      parseFlags(mipmap, options);
      if (Array.isArray(options.mipmap)) {
        var mipData = options.mipmap;
        for (var i = 0; i < mipData.length; ++i) {
          imgData = mipmap.images[i] = allocImage();
          copyFlags(imgData, mipmap);
          imgData.width >>= i;
          imgData.height >>= i;
          parseImage(imgData, mipData[i]);
          mipmap.mipmask |= (1 << i);
        }
      } else {
        imgData = mipmap.images[0] = allocImage();
        copyFlags(imgData, mipmap);
        parseImage(imgData, options);
        mipmap.mipmask = 1;
      }
    }
    copyFlags(mipmap, mipmap.images[0]);

    // For textures of the compressed format WEBGL_compressed_texture_s3tc
    // we must have that
    //
    // "When level equals zero width and height must be a multiple of 4.
    // When level is greater than 0 width and height must be 0, 1, 2 or a multiple of 4. "
    //
    // but we do not yet support having multiple mipmap levels for compressed textures,
    // so we only test for level zero.

    if (mipmap.compressed &&
        (mipmap.internalformat === GL_COMPRESSED_RGB_S3TC_DXT1_EXT) ||
        (mipmap.internalformat === GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) ||
        (mipmap.internalformat === GL_COMPRESSED_RGBA_S3TC_DXT3_EXT) ||
        (mipmap.internalformat === GL_COMPRESSED_RGBA_S3TC_DXT5_EXT)) {
      check$1(mipmap.width % 4 === 0 &&
            mipmap.height % 4 === 0,
            'for compressed texture formats, mipmap level 0 must have width and height that are a multiple of 4');
    }
  }

  function setMipMap (mipmap, target) {
    var images = mipmap.images;
    for (var i = 0; i < images.length; ++i) {
      if (!images[i]) {
        return
      }
      setImage(images[i], target, i);
    }
  }

  var mipPool = [];

  function allocMipMap () {
    var result = mipPool.pop() || new MipMap();
    TexFlags.call(result);
    result.mipmask = 0;
    for (var i = 0; i < 16; ++i) {
      result.images[i] = null;
    }
    return result
  }

  function freeMipMap (mipmap) {
    var images = mipmap.images;
    for (var i = 0; i < images.length; ++i) {
      if (images[i]) {
        freeImage(images[i]);
      }
      images[i] = null;
    }
    mipPool.push(mipmap);
  }

  // -------------------------------------------------------
  // Tex info
  // -------------------------------------------------------
  function TexInfo () {
    this.minFilter = GL_NEAREST$1;
    this.magFilter = GL_NEAREST$1;

    this.wrapS = GL_CLAMP_TO_EDGE$1;
    this.wrapT = GL_CLAMP_TO_EDGE$1;

    this.anisotropic = 1;

    this.genMipmaps = false;
    this.mipmapHint = GL_DONT_CARE;
  }

  function parseTexInfo (info, options) {
    if ('min' in options) {
      var minFilter = options.min;
      check$1.parameter(minFilter, minFilters);
      info.minFilter = minFilters[minFilter];
      if (MIPMAP_FILTERS.indexOf(info.minFilter) >= 0) {
        info.genMipmaps = true;
      }
    }

    if ('mag' in options) {
      var magFilter = options.mag;
      check$1.parameter(magFilter, magFilters);
      info.magFilter = magFilters[magFilter];
    }

    var wrapS = info.wrapS;
    var wrapT = info.wrapT;
    if ('wrap' in options) {
      var wrap = options.wrap;
      if (typeof wrap === 'string') {
        check$1.parameter(wrap, wrapModes);
        wrapS = wrapT = wrapModes[wrap];
      } else if (Array.isArray(wrap)) {
        check$1.parameter(wrap[0], wrapModes);
        check$1.parameter(wrap[1], wrapModes);
        wrapS = wrapModes[wrap[0]];
        wrapT = wrapModes[wrap[1]];
      }
    } else {
      if ('wrapS' in options) {
        var optWrapS = options.wrapS;
        check$1.parameter(optWrapS, wrapModes);
        wrapS = wrapModes[optWrapS];
      }
      if ('wrapT' in options) {
        var optWrapT = options.wrapT;
        check$1.parameter(optWrapT, wrapModes);
        wrapT = wrapModes[optWrapT];
      }
    }
    info.wrapS = wrapS;
    info.wrapT = wrapT;

    if ('anisotropic' in options) {
      var anisotropic = options.anisotropic;
      check$1(typeof anisotropic === 'number' &&
         anisotropic >= 1 && anisotropic <= limits.maxAnisotropic,
        'aniso samples must be between 1 and ');
      info.anisotropic = options.anisotropic;
    }

    if ('mipmap' in options) {
      var hasMipMap = false;
      switch (typeof options.mipmap) {
        case 'string':
          check$1.parameter(options.mipmap, mipmapHint,
            'invalid mipmap hint');
          info.mipmapHint = mipmapHint[options.mipmap];
          info.genMipmaps = true;
          hasMipMap = true;
          break

        case 'boolean':
          hasMipMap = info.genMipmaps = options.mipmap;
          break

        case 'object':
          check$1(Array.isArray(options.mipmap), 'invalid mipmap type');
          info.genMipmaps = false;
          hasMipMap = true;
          break

        default:
          check$1.raise('invalid mipmap type');
      }
      if (hasMipMap && !('min' in options)) {
        info.minFilter = GL_NEAREST_MIPMAP_NEAREST$1;
      }
    }
  }

  function setTexInfo (info, target) {
    gl.texParameteri(target, GL_TEXTURE_MIN_FILTER, info.minFilter);
    gl.texParameteri(target, GL_TEXTURE_MAG_FILTER, info.magFilter);
    gl.texParameteri(target, GL_TEXTURE_WRAP_S, info.wrapS);
    gl.texParameteri(target, GL_TEXTURE_WRAP_T, info.wrapT);
    if (extensions.ext_texture_filter_anisotropic) {
      gl.texParameteri(target, GL_TEXTURE_MAX_ANISOTROPY_EXT, info.anisotropic);
    }
    if (info.genMipmaps) {
      gl.hint(GL_GENERATE_MIPMAP_HINT, info.mipmapHint);
      gl.generateMipmap(target);
    }
  }

  // -------------------------------------------------------
  // Full texture object
  // -------------------------------------------------------
  var textureCount = 0;
  var textureSet = {};
  var numTexUnits = limits.maxTextureUnits;
  var textureUnits = Array(numTexUnits).map(function () {
    return null
  });

  function REGLTexture (target) {
    TexFlags.call(this);
    this.mipmask = 0;
    this.internalformat = GL_RGBA;

    this.id = textureCount++;

    this.refCount = 1;

    this.target = target;
    this.texture = gl.createTexture();

    this.unit = -1;
    this.bindCount = 0;

    this.texInfo = new TexInfo();

    if (config.profile) {
      this.stats = {size: 0};
    }
  }

  function tempBind (texture) {
    gl.activeTexture(GL_TEXTURE0);
    gl.bindTexture(texture.target, texture.texture);
  }

  function tempRestore () {
    var prev = textureUnits[0];
    if (prev) {
      gl.bindTexture(prev.target, prev.texture);
    } else {
      gl.bindTexture(GL_TEXTURE_2D, null);
    }
  }

  function destroy (texture) {
    var handle = texture.texture;
    check$1(handle, 'must not double destroy texture');
    var unit = texture.unit;
    var target = texture.target;
    if (unit >= 0) {
      gl.activeTexture(GL_TEXTURE0 + unit);
      gl.bindTexture(target, null);
      textureUnits[unit] = null;
    }
    gl.deleteTexture(handle);
    texture.texture = null;
    texture.params = null;
    texture.pixels = null;
    texture.refCount = 0;
    delete textureSet[texture.id];
    stats.textureCount--;
  }

  extend(REGLTexture.prototype, {
    bind: function () {
      var texture = this;
      texture.bindCount += 1;
      var unit = texture.unit;
      if (unit < 0) {
        for (var i = 0; i < numTexUnits; ++i) {
          var other = textureUnits[i];
          if (other) {
            if (other.bindCount > 0) {
              continue
            }
            other.unit = -1;
          }
          textureUnits[i] = texture;
          unit = i;
          break
        }
        if (unit >= numTexUnits) {
          check$1.raise('insufficient number of texture units');
        }
        if (config.profile && stats.maxTextureUnits < (unit + 1)) {
          stats.maxTextureUnits = unit + 1; // +1, since the units are zero-based
        }
        texture.unit = unit;
        gl.activeTexture(GL_TEXTURE0 + unit);
        gl.bindTexture(texture.target, texture.texture);
      }
      return unit
    },

    unbind: function () {
      this.bindCount -= 1;
    },

    decRef: function () {
      if (--this.refCount <= 0) {
        destroy(this);
      }
    }
  });

  function createTexture2D (a, b) {
    var texture = new REGLTexture(GL_TEXTURE_2D);
    textureSet[texture.id] = texture;
    stats.textureCount++;

    function reglTexture2D (a, b) {
      var texInfo = texture.texInfo;
      TexInfo.call(texInfo);
      var mipData = allocMipMap();

      if (typeof a === 'number') {
        if (typeof b === 'number') {
          parseMipMapFromShape(mipData, a | 0, b | 0);
        } else {
          parseMipMapFromShape(mipData, a | 0, a | 0);
        }
      } else if (a) {
        check$1.type(a, 'object', 'invalid arguments to regl.texture');
        parseTexInfo(texInfo, a);
        parseMipMapFromObject(mipData, a);
      } else {
        // empty textures get assigned a default shape of 1x1
        parseMipMapFromShape(mipData, 1, 1);
      }

      if (texInfo.genMipmaps) {
        mipData.mipmask = (mipData.width << 1) - 1;
      }
      texture.mipmask = mipData.mipmask;

      copyFlags(texture, mipData);

      check$1.texture2D(texInfo, mipData, limits);
      texture.internalformat = mipData.internalformat;

      reglTexture2D.width = mipData.width;
      reglTexture2D.height = mipData.height;

      tempBind(texture);
      setMipMap(mipData, GL_TEXTURE_2D);
      setTexInfo(texInfo, GL_TEXTURE_2D);
      tempRestore();

      freeMipMap(mipData);

      if (config.profile) {
        texture.stats.size = getTextureSize(
          texture.internalformat,
          texture.type,
          mipData.width,
          mipData.height,
          texInfo.genMipmaps,
          false);
      }
      reglTexture2D.format = textureFormatsInvert[texture.internalformat];
      reglTexture2D.type = textureTypesInvert[texture.type];

      reglTexture2D.mag = magFiltersInvert[texInfo.magFilter];
      reglTexture2D.min = minFiltersInvert[texInfo.minFilter];

      reglTexture2D.wrapS = wrapModesInvert[texInfo.wrapS];
      reglTexture2D.wrapT = wrapModesInvert[texInfo.wrapT];

      return reglTexture2D
    }

    function subimage (image, x_, y_, level_) {
      check$1(!!image, 'must specify image data');

      var x = x_ | 0;
      var y = y_ | 0;
      var level = level_ | 0;

      var imageData = allocImage();
      copyFlags(imageData, texture);
      imageData.width = 0;
      imageData.height = 0;
      parseImage(imageData, image);
      imageData.width = imageData.width || ((texture.width >> level) - x);
      imageData.height = imageData.height || ((texture.height >> level) - y);

      check$1(
        texture.type === imageData.type &&
        texture.format === imageData.format &&
        texture.internalformat === imageData.internalformat,
        'incompatible format for texture.subimage');
      check$1(
        x >= 0 && y >= 0 &&
        x + imageData.width <= texture.width &&
        y + imageData.height <= texture.height,
        'texture.subimage write out of bounds');
      check$1(
        texture.mipmask & (1 << level),
        'missing mipmap data');
      check$1(
        imageData.data || imageData.element || imageData.needsCopy,
        'missing image data');

      tempBind(texture);
      setSubImage(imageData, GL_TEXTURE_2D, x, y, level);
      tempRestore();

      freeImage(imageData);

      return reglTexture2D
    }

    function resize (w_, h_) {
      var w = w_ | 0;
      var h = (h_ | 0) || w;
      if (w === texture.width && h === texture.height) {
        return reglTexture2D
      }

      reglTexture2D.width = texture.width = w;
      reglTexture2D.height = texture.height = h;

      tempBind(texture);
      for (var i = 0; texture.mipmask >> i; ++i) {
        gl.texImage2D(
          GL_TEXTURE_2D,
          i,
          texture.format,
          w >> i,
          h >> i,
          0,
          texture.format,
          texture.type,
          null);
      }
      tempRestore();

      // also, recompute the texture size.
      if (config.profile) {
        texture.stats.size = getTextureSize(
          texture.internalformat,
          texture.type,
          w,
          h,
          false,
          false);
      }

      return reglTexture2D
    }

    reglTexture2D(a, b);

    reglTexture2D.subimage = subimage;
    reglTexture2D.resize = resize;
    reglTexture2D._reglType = 'texture2d';
    reglTexture2D._texture = texture;
    if (config.profile) {
      reglTexture2D.stats = texture.stats;
    }
    reglTexture2D.destroy = function () {
      texture.decRef();
    };

    return reglTexture2D
  }

  function createTextureCube (a0, a1, a2, a3, a4, a5) {
    var texture = new REGLTexture(GL_TEXTURE_CUBE_MAP);
    textureSet[texture.id] = texture;
    stats.cubeCount++;

    var faces = new Array(6);

    function reglTextureCube (a0, a1, a2, a3, a4, a5) {
      var i;
      var texInfo = texture.texInfo;
      TexInfo.call(texInfo);
      for (i = 0; i < 6; ++i) {
        faces[i] = allocMipMap();
      }

      if (typeof a0 === 'number' || !a0) {
        var s = (a0 | 0) || 1;
        for (i = 0; i < 6; ++i) {
          parseMipMapFromShape(faces[i], s, s);
        }
      } else if (typeof a0 === 'object') {
        if (a1) {
          parseMipMapFromObject(faces[0], a0);
          parseMipMapFromObject(faces[1], a1);
          parseMipMapFromObject(faces[2], a2);
          parseMipMapFromObject(faces[3], a3);
          parseMipMapFromObject(faces[4], a4);
          parseMipMapFromObject(faces[5], a5);
        } else {
          parseTexInfo(texInfo, a0);
          parseFlags(texture, a0);
          if ('faces' in a0) {
            var face_input = a0.faces;
            check$1(Array.isArray(face_input) && face_input.length === 6,
              'cube faces must be a length 6 array');
            for (i = 0; i < 6; ++i) {
              check$1(typeof face_input[i] === 'object' && !!face_input[i],
                'invalid input for cube map face');
              copyFlags(faces[i], texture);
              parseMipMapFromObject(faces[i], face_input[i]);
            }
          } else {
            for (i = 0; i < 6; ++i) {
              parseMipMapFromObject(faces[i], a0);
            }
          }
        }
      } else {
        check$1.raise('invalid arguments to cube map');
      }

      copyFlags(texture, faces[0]);
      if (texInfo.genMipmaps) {
        texture.mipmask = (faces[0].width << 1) - 1;
      } else {
        texture.mipmask = faces[0].mipmask;
      }

      check$1.textureCube(texture, texInfo, faces, limits);
      texture.internalformat = faces[0].internalformat;

      reglTextureCube.width = faces[0].width;
      reglTextureCube.height = faces[0].height;

      tempBind(texture);
      for (i = 0; i < 6; ++i) {
        setMipMap(faces[i], GL_TEXTURE_CUBE_MAP_POSITIVE_X + i);
      }
      setTexInfo(texInfo, GL_TEXTURE_CUBE_MAP);
      tempRestore();

      if (config.profile) {
        texture.stats.size = getTextureSize(
          texture.internalformat,
          texture.type,
          reglTextureCube.width,
          reglTextureCube.height,
          texInfo.genMipmaps,
          true);
      }

      reglTextureCube.format = textureFormatsInvert[texture.internalformat];
      reglTextureCube.type = textureTypesInvert[texture.type];

      reglTextureCube.mag = magFiltersInvert[texInfo.magFilter];
      reglTextureCube.min = minFiltersInvert[texInfo.minFilter];

      reglTextureCube.wrapS = wrapModesInvert[texInfo.wrapS];
      reglTextureCube.wrapT = wrapModesInvert[texInfo.wrapT];

      for (i = 0; i < 6; ++i) {
        freeMipMap(faces[i]);
      }

      return reglTextureCube
    }

    function subimage (face, image, x_, y_, level_) {
      check$1(!!image, 'must specify image data');
      check$1(typeof face === 'number' && face === (face | 0) &&
        face >= 0 && face < 6, 'invalid face');

      var x = x_ | 0;
      var y = y_ | 0;
      var level = level_ | 0;

      var imageData = allocImage();
      copyFlags(imageData, texture);
      imageData.width = 0;
      imageData.height = 0;
      parseImage(imageData, image);
      imageData.width = imageData.width || ((texture.width >> level) - x);
      imageData.height = imageData.height || ((texture.height >> level) - y);

      check$1(
        texture.type === imageData.type &&
        texture.format === imageData.format &&
        texture.internalformat === imageData.internalformat,
        'incompatible format for texture.subimage');
      check$1(
        x >= 0 && y >= 0 &&
        x + imageData.width <= texture.width &&
        y + imageData.height <= texture.height,
        'texture.subimage write out of bounds');
      check$1(
        texture.mipmask & (1 << level),
        'missing mipmap data');
      check$1(
        imageData.data || imageData.element || imageData.needsCopy,
        'missing image data');

      tempBind(texture);
      setSubImage(imageData, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, x, y, level);
      tempRestore();

      freeImage(imageData);

      return reglTextureCube
    }

    function resize (radius_) {
      var radius = radius_ | 0;
      if (radius === texture.width) {
        return
      }

      reglTextureCube.width = texture.width = radius;
      reglTextureCube.height = texture.height = radius;

      tempBind(texture);
      for (var i = 0; i < 6; ++i) {
        for (var j = 0; texture.mipmask >> j; ++j) {
          gl.texImage2D(
            GL_TEXTURE_CUBE_MAP_POSITIVE_X + i,
            j,
            texture.format,
            radius >> j,
            radius >> j,
            0,
            texture.format,
            texture.type,
            null);
        }
      }
      tempRestore();

      if (config.profile) {
        texture.stats.size = getTextureSize(
          texture.internalformat,
          texture.type,
          reglTextureCube.width,
          reglTextureCube.height,
          false,
          true);
      }

      return reglTextureCube
    }

    reglTextureCube(a0, a1, a2, a3, a4, a5);

    reglTextureCube.subimage = subimage;
    reglTextureCube.resize = resize;
    reglTextureCube._reglType = 'textureCube';
    reglTextureCube._texture = texture;
    if (config.profile) {
      reglTextureCube.stats = texture.stats;
    }
    reglTextureCube.destroy = function () {
      texture.decRef();
    };

    return reglTextureCube
  }

  // Called when regl is destroyed
  function destroyTextures () {
    for (var i = 0; i < numTexUnits; ++i) {
      gl.activeTexture(GL_TEXTURE0 + i);
      gl.bindTexture(GL_TEXTURE_2D, null);
      textureUnits[i] = null;
    }
    values(textureSet).forEach(destroy);

    stats.cubeCount = 0;
    stats.textureCount = 0;
  }

  if (config.profile) {
    stats.getTotalTextureSize = function () {
      var total = 0;
      Object.keys(textureSet).forEach(function (key) {
        total += textureSet[key].stats.size;
      });
      return total
    };
  }

  function restoreTextures () {
    values(textureSet).forEach(function (texture) {
      texture.texture = gl.createTexture();
      gl.bindTexture(texture.target, texture.texture);
      for (var i = 0; i < 32; ++i) {
        if ((texture.mipmask & (1 << i)) === 0) {
          continue
        }
        if (texture.target === GL_TEXTURE_2D) {
          gl.texImage2D(GL_TEXTURE_2D,
            i,
            texture.internalformat,
            texture.width >> i,
            texture.height >> i,
            0,
            texture.internalformat,
            texture.type,
            null);
        } else {
          for (var j = 0; j < 6; ++j) {
            gl.texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + j,
              i,
              texture.internalformat,
              texture.width >> i,
              texture.height >> i,
              0,
              texture.internalformat,
              texture.type,
              null);
          }
        }
      }
      setTexInfo(texture.texInfo, texture.target);
    });
  }

  return {
    create2D: createTexture2D,
    createCube: createTextureCube,
    clear: destroyTextures,
    getTexture: function (wrapper) {
      return null
    },
    restore: restoreTextures
  }
}

var GL_RENDERBUFFER = 0x8D41;

var GL_RGBA4$1 = 0x8056;
var GL_RGB5_A1$1 = 0x8057;
var GL_RGB565$1 = 0x8D62;
var GL_DEPTH_COMPONENT16 = 0x81A5;
var GL_STENCIL_INDEX8 = 0x8D48;
var GL_DEPTH_STENCIL$1 = 0x84F9;

var GL_SRGB8_ALPHA8_EXT = 0x8C43;

var GL_RGBA32F_EXT = 0x8814;

var GL_RGBA16F_EXT = 0x881A;
var GL_RGB16F_EXT = 0x881B;

var FORMAT_SIZES = [];

FORMAT_SIZES[GL_RGBA4$1] = 2;
FORMAT_SIZES[GL_RGB5_A1$1] = 2;
FORMAT_SIZES[GL_RGB565$1] = 2;

FORMAT_SIZES[GL_DEPTH_COMPONENT16] = 2;
FORMAT_SIZES[GL_STENCIL_INDEX8] = 1;
FORMAT_SIZES[GL_DEPTH_STENCIL$1] = 4;

FORMAT_SIZES[GL_SRGB8_ALPHA8_EXT] = 4;
FORMAT_SIZES[GL_RGBA32F_EXT] = 16;
FORMAT_SIZES[GL_RGBA16F_EXT] = 8;
FORMAT_SIZES[GL_RGB16F_EXT] = 6;

function getRenderbufferSize (format, width, height) {
  return FORMAT_SIZES[format] * width * height
}

var wrapRenderbuffers = function (gl, extensions, limits, stats, config) {
  var formatTypes = {
    'rgba4': GL_RGBA4$1,
    'rgb565': GL_RGB565$1,
    'rgb5 a1': GL_RGB5_A1$1,
    'depth': GL_DEPTH_COMPONENT16,
    'stencil': GL_STENCIL_INDEX8,
    'depth stencil': GL_DEPTH_STENCIL$1
  };

  if (extensions.ext_srgb) {
    formatTypes['srgba'] = GL_SRGB8_ALPHA8_EXT;
  }

  if (extensions.ext_color_buffer_half_float) {
    formatTypes['rgba16f'] = GL_RGBA16F_EXT;
    formatTypes['rgb16f'] = GL_RGB16F_EXT;
  }

  if (extensions.webgl_color_buffer_float) {
    formatTypes['rgba32f'] = GL_RGBA32F_EXT;
  }

  var formatTypesInvert = [];
  Object.keys(formatTypes).forEach(function (key) {
    var val = formatTypes[key];
    formatTypesInvert[val] = key;
  });

  var renderbufferCount = 0;
  var renderbufferSet = {};

  function REGLRenderbuffer (renderbuffer) {
    this.id = renderbufferCount++;
    this.refCount = 1;

    this.renderbuffer = renderbuffer;

    this.format = GL_RGBA4$1;
    this.width = 0;
    this.height = 0;

    if (config.profile) {
      this.stats = {size: 0};
    }
  }

  REGLRenderbuffer.prototype.decRef = function () {
    if (--this.refCount <= 0) {
      destroy(this);
    }
  };

  function destroy (rb) {
    var handle = rb.renderbuffer;
    check$1(handle, 'must not double destroy renderbuffer');
    gl.bindRenderbuffer(GL_RENDERBUFFER, null);
    gl.deleteRenderbuffer(handle);
    rb.renderbuffer = null;
    rb.refCount = 0;
    delete renderbufferSet[rb.id];
    stats.renderbufferCount--;
  }

  function createRenderbuffer (a, b) {
    var renderbuffer = new REGLRenderbuffer(gl.createRenderbuffer());
    renderbufferSet[renderbuffer.id] = renderbuffer;
    stats.renderbufferCount++;

    function reglRenderbuffer (a, b) {
      var w = 0;
      var h = 0;
      var format = GL_RGBA4$1;

      if (typeof a === 'object' && a) {
        var options = a;
        if ('shape' in options) {
          var shape = options.shape;
          check$1(Array.isArray(shape) && shape.length >= 2,
            'invalid renderbuffer shape');
          w = shape[0] | 0;
          h = shape[1] | 0;
        } else {
          if ('radius' in options) {
            w = h = options.radius | 0;
          }
          if ('width' in options) {
            w = options.width | 0;
          }
          if ('height' in options) {
            h = options.height | 0;
          }
        }
        if ('format' in options) {
          check$1.parameter(options.format, formatTypes,
            'invalid renderbuffer format');
          format = formatTypes[options.format];
        }
      } else if (typeof a === 'number') {
        w = a | 0;
        if (typeof b === 'number') {
          h = b | 0;
        } else {
          h = w;
        }
      } else if (!a) {
        w = h = 1;
      } else {
        check$1.raise('invalid arguments to renderbuffer constructor');
      }

      // check shape
      check$1(
        w > 0 && h > 0 &&
        w <= limits.maxRenderbufferSize && h <= limits.maxRenderbufferSize,
        'invalid renderbuffer size');

      if (w === renderbuffer.width &&
          h === renderbuffer.height &&
          format === renderbuffer.format) {
        return
      }

      reglRenderbuffer.width = renderbuffer.width = w;
      reglRenderbuffer.height = renderbuffer.height = h;
      renderbuffer.format = format;

      gl.bindRenderbuffer(GL_RENDERBUFFER, renderbuffer.renderbuffer);
      gl.renderbufferStorage(GL_RENDERBUFFER, format, w, h);

      if (config.profile) {
        renderbuffer.stats.size = getRenderbufferSize(renderbuffer.format, renderbuffer.width, renderbuffer.height);
      }
      reglRenderbuffer.format = formatTypesInvert[renderbuffer.format];

      return reglRenderbuffer
    }

    function resize (w_, h_) {
      var w = w_ | 0;
      var h = (h_ | 0) || w;

      if (w === renderbuffer.width && h === renderbuffer.height) {
        return reglRenderbuffer
      }

      // check shape
      check$1(
        w > 0 && h > 0 &&
        w <= limits.maxRenderbufferSize && h <= limits.maxRenderbufferSize,
        'invalid renderbuffer size');

      reglRenderbuffer.width = renderbuffer.width = w;
      reglRenderbuffer.height = renderbuffer.height = h;

      gl.bindRenderbuffer(GL_RENDERBUFFER, renderbuffer.renderbuffer);
      gl.renderbufferStorage(GL_RENDERBUFFER, renderbuffer.format, w, h);

      // also, recompute size.
      if (config.profile) {
        renderbuffer.stats.size = getRenderbufferSize(
          renderbuffer.format, renderbuffer.width, renderbuffer.height);
      }

      return reglRenderbuffer
    }

    reglRenderbuffer(a, b);

    reglRenderbuffer.resize = resize;
    reglRenderbuffer._reglType = 'renderbuffer';
    reglRenderbuffer._renderbuffer = renderbuffer;
    if (config.profile) {
      reglRenderbuffer.stats = renderbuffer.stats;
    }
    reglRenderbuffer.destroy = function () {
      renderbuffer.decRef();
    };

    return reglRenderbuffer
  }

  if (config.profile) {
    stats.getTotalRenderbufferSize = function () {
      var total = 0;
      Object.keys(renderbufferSet).forEach(function (key) {
        total += renderbufferSet[key].stats.size;
      });
      return total
    };
  }

  function restoreRenderbuffers () {
    values(renderbufferSet).forEach(function (rb) {
      rb.renderbuffer = gl.createRenderbuffer();
      gl.bindRenderbuffer(GL_RENDERBUFFER, rb.renderbuffer);
      gl.renderbufferStorage(GL_RENDERBUFFER, rb.format, rb.width, rb.height);
    });
    gl.bindRenderbuffer(GL_RENDERBUFFER, null);
  }

  return {
    create: createRenderbuffer,
    clear: function () {
      values(renderbufferSet).forEach(destroy);
    },
    restore: restoreRenderbuffers
  }
};

// We store these constants so that the minifier can inline them
var GL_FRAMEBUFFER = 0x8D40;
var GL_RENDERBUFFER$1 = 0x8D41;

var GL_TEXTURE_2D$1 = 0x0DE1;
var GL_TEXTURE_CUBE_MAP_POSITIVE_X$1 = 0x8515;

var GL_COLOR_ATTACHMENT0 = 0x8CE0;
var GL_DEPTH_ATTACHMENT = 0x8D00;
var GL_STENCIL_ATTACHMENT = 0x8D20;
var GL_DEPTH_STENCIL_ATTACHMENT = 0x821A;

var GL_FRAMEBUFFER_COMPLETE = 0x8CD5;
var GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT = 0x8CD6;
var GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = 0x8CD7;
var GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS = 0x8CD9;
var GL_FRAMEBUFFER_UNSUPPORTED = 0x8CDD;

var GL_HALF_FLOAT_OES$2 = 0x8D61;
var GL_UNSIGNED_BYTE$5 = 0x1401;
var GL_FLOAT$4 = 0x1406;

var GL_RGBA$1 = 0x1908;

var GL_DEPTH_COMPONENT$1 = 0x1902;

var colorTextureFormatEnums = [
  GL_RGBA$1
];

// for every texture format, store
// the number of channels
var textureFormatChannels = [];
textureFormatChannels[GL_RGBA$1] = 4;

// for every texture type, store
// the size in bytes.
var textureTypeSizes = [];
textureTypeSizes[GL_UNSIGNED_BYTE$5] = 1;
textureTypeSizes[GL_FLOAT$4] = 4;
textureTypeSizes[GL_HALF_FLOAT_OES$2] = 2;

var GL_RGBA4$2 = 0x8056;
var GL_RGB5_A1$2 = 0x8057;
var GL_RGB565$2 = 0x8D62;
var GL_DEPTH_COMPONENT16$1 = 0x81A5;
var GL_STENCIL_INDEX8$1 = 0x8D48;
var GL_DEPTH_STENCIL$2 = 0x84F9;

var GL_SRGB8_ALPHA8_EXT$1 = 0x8C43;

var GL_RGBA32F_EXT$1 = 0x8814;

var GL_RGBA16F_EXT$1 = 0x881A;
var GL_RGB16F_EXT$1 = 0x881B;

var colorRenderbufferFormatEnums = [
  GL_RGBA4$2,
  GL_RGB5_A1$2,
  GL_RGB565$2,
  GL_SRGB8_ALPHA8_EXT$1,
  GL_RGBA16F_EXT$1,
  GL_RGB16F_EXT$1,
  GL_RGBA32F_EXT$1
];

var statusCode = {};
statusCode[GL_FRAMEBUFFER_COMPLETE] = 'complete';
statusCode[GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT] = 'incomplete attachment';
statusCode[GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS] = 'incomplete dimensions';
statusCode[GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT] = 'incomplete, missing attachment';
statusCode[GL_FRAMEBUFFER_UNSUPPORTED] = 'unsupported';

function wrapFBOState (
  gl,
  extensions,
  limits,
  textureState,
  renderbufferState,
  stats) {
  var framebufferState = {
    cur: null,
    next: null,
    dirty: false,
    setFBO: null
  };

  var colorTextureFormats = ['rgba'];
  var colorRenderbufferFormats = ['rgba4', 'rgb565', 'rgb5 a1'];

  if (extensions.ext_srgb) {
    colorRenderbufferFormats.push('srgba');
  }

  if (extensions.ext_color_buffer_half_float) {
    colorRenderbufferFormats.push('rgba16f', 'rgb16f');
  }

  if (extensions.webgl_color_buffer_float) {
    colorRenderbufferFormats.push('rgba32f');
  }

  var colorTypes = ['uint8'];
  if (extensions.oes_texture_half_float) {
    colorTypes.push('half float', 'float16');
  }
  if (extensions.oes_texture_float) {
    colorTypes.push('float', 'float32');
  }

  function FramebufferAttachment (target, texture, renderbuffer) {
    this.target = target;
    this.texture = texture;
    this.renderbuffer = renderbuffer;

    var w = 0;
    var h = 0;
    if (texture) {
      w = texture.width;
      h = texture.height;
    } else if (renderbuffer) {
      w = renderbuffer.width;
      h = renderbuffer.height;
    }
    this.width = w;
    this.height = h;
  }

  function decRef (attachment) {
    if (attachment) {
      if (attachment.texture) {
        attachment.texture._texture.decRef();
      }
      if (attachment.renderbuffer) {
        attachment.renderbuffer._renderbuffer.decRef();
      }
    }
  }

  function incRefAndCheckShape (attachment, width, height) {
    if (!attachment) {
      return
    }
    if (attachment.texture) {
      var texture = attachment.texture._texture;
      var tw = Math.max(1, texture.width);
      var th = Math.max(1, texture.height);
      check$1(tw === width && th === height,
        'inconsistent width/height for supplied texture');
      texture.refCount += 1;
    } else {
      var renderbuffer = attachment.renderbuffer._renderbuffer;
      check$1(
        renderbuffer.width === width && renderbuffer.height === height,
        'inconsistent width/height for renderbuffer');
      renderbuffer.refCount += 1;
    }
  }

  function attach (location, attachment) {
    if (attachment) {
      if (attachment.texture) {
        gl.framebufferTexture2D(
          GL_FRAMEBUFFER,
          location,
          attachment.target,
          attachment.texture._texture.texture,
          0);
      } else {
        gl.framebufferRenderbuffer(
          GL_FRAMEBUFFER,
          location,
          GL_RENDERBUFFER$1,
          attachment.renderbuffer._renderbuffer.renderbuffer);
      }
    }
  }

  function parseAttachment (attachment) {
    var target = GL_TEXTURE_2D$1;
    var texture = null;
    var renderbuffer = null;

    var data = attachment;
    if (typeof attachment === 'object') {
      data = attachment.data;
      if ('target' in attachment) {
        target = attachment.target | 0;
      }
    }

    check$1.type(data, 'function', 'invalid attachment data');

    var type = data._reglType;
    if (type === 'texture2d') {
      texture = data;
      check$1(target === GL_TEXTURE_2D$1);
    } else if (type === 'textureCube') {
      texture = data;
      check$1(
        target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X$1 &&
        target < GL_TEXTURE_CUBE_MAP_POSITIVE_X$1 + 6,
        'invalid cube map target');
    } else if (type === 'renderbuffer') {
      renderbuffer = data;
      target = GL_RENDERBUFFER$1;
    } else {
      check$1.raise('invalid regl object for attachment');
    }

    return new FramebufferAttachment(target, texture, renderbuffer)
  }

  function allocAttachment (
    width,
    height,
    isTexture,
    format,
    type) {
    if (isTexture) {
      var texture = textureState.create2D({
        width: width,
        height: height,
        format: format,
        type: type
      });
      texture._texture.refCount = 0;
      return new FramebufferAttachment(GL_TEXTURE_2D$1, texture, null)
    } else {
      var rb = renderbufferState.create({
        width: width,
        height: height,
        format: format
      });
      rb._renderbuffer.refCount = 0;
      return new FramebufferAttachment(GL_RENDERBUFFER$1, null, rb)
    }
  }

  function unwrapAttachment (attachment) {
    return attachment && (attachment.texture || attachment.renderbuffer)
  }

  function resizeAttachment (attachment, w, h) {
    if (attachment) {
      if (attachment.texture) {
        attachment.texture.resize(w, h);
      } else if (attachment.renderbuffer) {
        attachment.renderbuffer.resize(w, h);
      }
    }
  }

  var framebufferCount = 0;
  var framebufferSet = {};

  function REGLFramebuffer () {
    this.id = framebufferCount++;
    framebufferSet[this.id] = this;

    this.framebuffer = gl.createFramebuffer();
    this.width = 0;
    this.height = 0;

    this.colorAttachments = [];
    this.depthAttachment = null;
    this.stencilAttachment = null;
    this.depthStencilAttachment = null;
  }

  function decFBORefs (framebuffer) {
    framebuffer.colorAttachments.forEach(decRef);
    decRef(framebuffer.depthAttachment);
    decRef(framebuffer.stencilAttachment);
    decRef(framebuffer.depthStencilAttachment);
  }

  function destroy (framebuffer) {
    var handle = framebuffer.framebuffer;
    check$1(handle, 'must not double destroy framebuffer');
    gl.deleteFramebuffer(handle);
    framebuffer.framebuffer = null;
    stats.framebufferCount--;
    delete framebufferSet[framebuffer.id];
  }

  function updateFramebuffer (framebuffer) {
    var i;

    gl.bindFramebuffer(GL_FRAMEBUFFER, framebuffer.framebuffer);
    var colorAttachments = framebuffer.colorAttachments;
    for (i = 0; i < colorAttachments.length; ++i) {
      attach(GL_COLOR_ATTACHMENT0 + i, colorAttachments[i]);
    }
    for (i = colorAttachments.length; i < limits.maxColorAttachments; ++i) {
      gl.framebufferTexture2D(
        GL_FRAMEBUFFER,
        GL_COLOR_ATTACHMENT0 + i,
        GL_TEXTURE_2D$1,
        null,
        0);
    }

    gl.framebufferTexture2D(
      GL_FRAMEBUFFER,
      GL_DEPTH_STENCIL_ATTACHMENT,
      GL_TEXTURE_2D$1,
      null,
      0);
    gl.framebufferTexture2D(
      GL_FRAMEBUFFER,
      GL_DEPTH_ATTACHMENT,
      GL_TEXTURE_2D$1,
      null,
      0);
    gl.framebufferTexture2D(
      GL_FRAMEBUFFER,
      GL_STENCIL_ATTACHMENT,
      GL_TEXTURE_2D$1,
      null,
      0);

    attach(GL_DEPTH_ATTACHMENT, framebuffer.depthAttachment);
    attach(GL_STENCIL_ATTACHMENT, framebuffer.stencilAttachment);
    attach(GL_DEPTH_STENCIL_ATTACHMENT, framebuffer.depthStencilAttachment);

    // Check status code
    var status = gl.checkFramebufferStatus(GL_FRAMEBUFFER);
    if (status !== GL_FRAMEBUFFER_COMPLETE) {
      check$1.raise('framebuffer configuration not supported, status = ' +
        statusCode[status]);
    }

    gl.bindFramebuffer(GL_FRAMEBUFFER, framebufferState.next);
    framebufferState.cur = framebufferState.next;

    // FIXME: Clear error code here.  This is a work around for a bug in
    // headless-gl
    gl.getError();
  }

  function createFBO (a0, a1) {
    var framebuffer = new REGLFramebuffer();
    stats.framebufferCount++;

    function reglFramebuffer (a, b) {
      var i;

      check$1(framebufferState.next !== framebuffer,
        'can not update framebuffer which is currently in use');

      var extDrawBuffers = extensions.webgl_draw_buffers;

      var width = 0;
      var height = 0;

      var needsDepth = true;
      var needsStencil = true;

      var colorBuffer = null;
      var colorTexture = true;
      var colorFormat = 'rgba';
      var colorType = 'uint8';
      var colorCount = 1;

      var depthBuffer = null;
      var stencilBuffer = null;
      var depthStencilBuffer = null;
      var depthStencilTexture = false;

      if (typeof a === 'number') {
        width = a | 0;
        height = (b | 0) || width;
      } else if (!a) {
        width = height = 1;
      } else {
        check$1.type(a, 'object', 'invalid arguments for framebuffer');
        var options = a;

        if ('shape' in options) {
          var shape = options.shape;
          check$1(Array.isArray(shape) && shape.length >= 2,
            'invalid shape for framebuffer');
          width = shape[0];
          height = shape[1];
        } else {
          if ('radius' in options) {
            width = height = options.radius;
          }
          if ('width' in options) {
            width = options.width;
          }
          if ('height' in options) {
            height = options.height;
          }
        }

        if ('color' in options ||
            'colors' in options) {
          colorBuffer =
            options.color ||
            options.colors;
          if (Array.isArray(colorBuffer)) {
            check$1(
              colorBuffer.length === 1 || extDrawBuffers,
              'multiple render targets not supported');
          }
        }

        if (!colorBuffer) {
          if ('colorCount' in options) {
            colorCount = options.colorCount | 0;
            check$1(colorCount > 0, 'invalid color buffer count');
          }

          if ('colorTexture' in options) {
            colorTexture = !!options.colorTexture;
            colorFormat = 'rgba4';
          }

          if ('colorType' in options) {
            colorType = options.colorType;
            if (!colorTexture) {
              if (colorType === 'half float' || colorType === 'float16') {
                check$1(extensions.ext_color_buffer_half_float,
                  'you must enable EXT_color_buffer_half_float to use 16-bit render buffers');
                colorFormat = 'rgba16f';
              } else if (colorType === 'float' || colorType === 'float32') {
                check$1(extensions.webgl_color_buffer_float,
                  'you must enable WEBGL_color_buffer_float in order to use 32-bit floating point renderbuffers');
                colorFormat = 'rgba32f';
              }
            } else {
              check$1(extensions.oes_texture_float ||
                !(colorType === 'float' || colorType === 'float32'),
                'you must enable OES_texture_float in order to use floating point framebuffer objects');
              check$1(extensions.oes_texture_half_float ||
                !(colorType === 'half float' || colorType === 'float16'),
                'you must enable OES_texture_half_float in order to use 16-bit floating point framebuffer objects');
            }
            check$1.oneOf(colorType, colorTypes, 'invalid color type');
          }

          if ('colorFormat' in options) {
            colorFormat = options.colorFormat;
            if (colorTextureFormats.indexOf(colorFormat) >= 0) {
              colorTexture = true;
            } else if (colorRenderbufferFormats.indexOf(colorFormat) >= 0) {
              colorTexture = false;
            } else {
              if (colorTexture) {
                check$1.oneOf(
                  options.colorFormat, colorTextureFormats,
                  'invalid color format for texture');
              } else {
                check$1.oneOf(
                  options.colorFormat, colorRenderbufferFormats,
                  'invalid color format for renderbuffer');
              }
            }
          }
        }

        if ('depthTexture' in options || 'depthStencilTexture' in options) {
          depthStencilTexture = !!(options.depthTexture ||
            options.depthStencilTexture);
          check$1(!depthStencilTexture || extensions.webgl_depth_texture,
            'webgl_depth_texture extension not supported');
        }

        if ('depth' in options) {
          if (typeof options.depth === 'boolean') {
            needsDepth = options.depth;
          } else {
            depthBuffer = options.depth;
            needsStencil = false;
          }
        }

        if ('stencil' in options) {
          if (typeof options.stencil === 'boolean') {
            needsStencil = options.stencil;
          } else {
            stencilBuffer = options.stencil;
            needsDepth = false;
          }
        }

        if ('depthStencil' in options) {
          if (typeof options.depthStencil === 'boolean') {
            needsDepth = needsStencil = options.depthStencil;
          } else {
            depthStencilBuffer = options.depthStencil;
            needsDepth = false;
            needsStencil = false;
          }
        }
      }

      // parse attachments
      var colorAttachments = null;
      var depthAttachment = null;
      var stencilAttachment = null;
      var depthStencilAttachment = null;

      // Set up color attachments
      if (Array.isArray(colorBuffer)) {
        colorAttachments = colorBuffer.map(parseAttachment);
      } else if (colorBuffer) {
        colorAttachments = [parseAttachment(colorBuffer)];
      } else {
        colorAttachments = new Array(colorCount);
        for (i = 0; i < colorCount; ++i) {
          colorAttachments[i] = allocAttachment(
            width,
            height,
            colorTexture,
            colorFormat,
            colorType);
        }
      }

      check$1(extensions.webgl_draw_buffers || colorAttachments.length <= 1,
        'you must enable the WEBGL_draw_buffers extension in order to use multiple color buffers.');
      check$1(colorAttachments.length <= limits.maxColorAttachments,
        'too many color attachments, not supported');

      width = width || colorAttachments[0].width;
      height = height || colorAttachments[0].height;

      if (depthBuffer) {
        depthAttachment = parseAttachment(depthBuffer);
      } else if (needsDepth && !needsStencil) {
        depthAttachment = allocAttachment(
          width,
          height,
          depthStencilTexture,
          'depth',
          'uint32');
      }

      if (stencilBuffer) {
        stencilAttachment = parseAttachment(stencilBuffer);
      } else if (needsStencil && !needsDepth) {
        stencilAttachment = allocAttachment(
          width,
          height,
          false,
          'stencil',
          'uint8');
      }

      if (depthStencilBuffer) {
        depthStencilAttachment = parseAttachment(depthStencilBuffer);
      } else if (!depthBuffer && !stencilBuffer && needsStencil && needsDepth) {
        depthStencilAttachment = allocAttachment(
          width,
          height,
          depthStencilTexture,
          'depth stencil',
          'depth stencil');
      }

      check$1(
        (!!depthBuffer) + (!!stencilBuffer) + (!!depthStencilBuffer) <= 1,
        'invalid framebuffer configuration, can specify exactly one depth/stencil attachment');

      var commonColorAttachmentSize = null;

      for (i = 0; i < colorAttachments.length; ++i) {
        incRefAndCheckShape(colorAttachments[i], width, height);
        check$1(!colorAttachments[i] ||
          (colorAttachments[i].texture &&
            colorTextureFormatEnums.indexOf(colorAttachments[i].texture._texture.format) >= 0) ||
          (colorAttachments[i].renderbuffer &&
            colorRenderbufferFormatEnums.indexOf(colorAttachments[i].renderbuffer._renderbuffer.format) >= 0),
          'framebuffer color attachment ' + i + ' is invalid');

        if (colorAttachments[i] && colorAttachments[i].texture) {
          var colorAttachmentSize =
              textureFormatChannels[colorAttachments[i].texture._texture.format] *
              textureTypeSizes[colorAttachments[i].texture._texture.type];

          if (commonColorAttachmentSize === null) {
            commonColorAttachmentSize = colorAttachmentSize;
          } else {
            // We need to make sure that all color attachments have the same number of bitplanes
            // (that is, the same numer of bits per pixel)
            // This is required by the GLES2.0 standard. See the beginning of Chapter 4 in that document.
            check$1(commonColorAttachmentSize === colorAttachmentSize,
                  'all color attachments much have the same number of bits per pixel.');
          }
        }
      }
      incRefAndCheckShape(depthAttachment, width, height);
      check$1(!depthAttachment ||
        (depthAttachment.texture &&
          depthAttachment.texture._texture.format === GL_DEPTH_COMPONENT$1) ||
        (depthAttachment.renderbuffer &&
          depthAttachment.renderbuffer._renderbuffer.format === GL_DEPTH_COMPONENT16$1),
        'invalid depth attachment for framebuffer object');
      incRefAndCheckShape(stencilAttachment, width, height);
      check$1(!stencilAttachment ||
        (stencilAttachment.renderbuffer &&
          stencilAttachment.renderbuffer._renderbuffer.format === GL_STENCIL_INDEX8$1),
        'invalid stencil attachment for framebuffer object');
      incRefAndCheckShape(depthStencilAttachment, width, height);
      check$1(!depthStencilAttachment ||
        (depthStencilAttachment.texture &&
          depthStencilAttachment.texture._texture.format === GL_DEPTH_STENCIL$2) ||
        (depthStencilAttachment.renderbuffer &&
          depthStencilAttachment.renderbuffer._renderbuffer.format === GL_DEPTH_STENCIL$2),
        'invalid depth-stencil attachment for framebuffer object');

      // decrement references
      decFBORefs(framebuffer);

      framebuffer.width = width;
      framebuffer.height = height;

      framebuffer.colorAttachments = colorAttachments;
      framebuffer.depthAttachment = depthAttachment;
      framebuffer.stencilAttachment = stencilAttachment;
      framebuffer.depthStencilAttachment = depthStencilAttachment;

      reglFramebuffer.color = colorAttachments.map(unwrapAttachment);
      reglFramebuffer.depth = unwrapAttachment(depthAttachment);
      reglFramebuffer.stencil = unwrapAttachment(stencilAttachment);
      reglFramebuffer.depthStencil = unwrapAttachment(depthStencilAttachment);

      reglFramebuffer.width = framebuffer.width;
      reglFramebuffer.height = framebuffer.height;

      updateFramebuffer(framebuffer);

      return reglFramebuffer
    }

    function resize (w_, h_) {
      check$1(framebufferState.next !== framebuffer,
        'can not resize a framebuffer which is currently in use');

      var w = w_ | 0;
      var h = (h_ | 0) || w;
      if (w === framebuffer.width && h === framebuffer.height) {
        return reglFramebuffer
      }

      // resize all buffers
      var colorAttachments = framebuffer.colorAttachments;
      for (var i = 0; i < colorAttachments.length; ++i) {
        resizeAttachment(colorAttachments[i], w, h);
      }
      resizeAttachment(framebuffer.depthAttachment, w, h);
      resizeAttachment(framebuffer.stencilAttachment, w, h);
      resizeAttachment(framebuffer.depthStencilAttachment, w, h);

      framebuffer.width = reglFramebuffer.width = w;
      framebuffer.height = reglFramebuffer.height = h;

      updateFramebuffer(framebuffer);

      return reglFramebuffer
    }

    reglFramebuffer(a0, a1);

    return extend(reglFramebuffer, {
      resize: resize,
      _reglType: 'framebuffer',
      _framebuffer: framebuffer,
      destroy: function () {
        destroy(framebuffer);
        decFBORefs(framebuffer);
      },
      use: function (block) {
        framebufferState.setFBO({
          framebuffer: reglFramebuffer
        }, block);
      }
    })
  }

  function createCubeFBO (options) {
    var faces = Array(6);

    function reglFramebufferCube (a) {
      var i;

      check$1(faces.indexOf(framebufferState.next) < 0,
        'can not update framebuffer which is currently in use');

      var extDrawBuffers = extensions.webgl_draw_buffers;

      var params = {
        color: null
      };

      var radius = 0;

      var colorBuffer = null;
      var colorFormat = 'rgba';
      var colorType = 'uint8';
      var colorCount = 1;

      if (typeof a === 'number') {
        radius = a | 0;
      } else if (!a) {
        radius = 1;
      } else {
        check$1.type(a, 'object', 'invalid arguments for framebuffer');
        var options = a;

        if ('shape' in options) {
          var shape = options.shape;
          check$1(
            Array.isArray(shape) && shape.length >= 2,
            'invalid shape for framebuffer');
          check$1(
            shape[0] === shape[1],
            'cube framebuffer must be square');
          radius = shape[0];
        } else {
          if ('radius' in options) {
            radius = options.radius | 0;
          }
          if ('width' in options) {
            radius = options.width | 0;
            if ('height' in options) {
              check$1(options.height === radius, 'must be square');
            }
          } else if ('height' in options) {
            radius = options.height | 0;
          }
        }

        if ('color' in options ||
            'colors' in options) {
          colorBuffer =
            options.color ||
            options.colors;
          if (Array.isArray(colorBuffer)) {
            check$1(
              colorBuffer.length === 1 || extDrawBuffers,
              'multiple render targets not supported');
          }
        }

        if (!colorBuffer) {
          if ('colorCount' in options) {
            colorCount = options.colorCount | 0;
            check$1(colorCount > 0, 'invalid color buffer count');
          }

          if ('colorType' in options) {
            check$1.oneOf(
              options.colorType, colorTypes,
              'invalid color type');
            colorType = options.colorType;
          }

          if ('colorFormat' in options) {
            colorFormat = options.colorFormat;
            check$1.oneOf(
              options.colorFormat, colorTextureFormats,
              'invalid color format for texture');
          }
        }

        if ('depth' in options) {
          params.depth = options.depth;
        }

        if ('stencil' in options) {
          params.stencil = options.stencil;
        }

        if ('depthStencil' in options) {
          params.depthStencil = options.depthStencil;
        }
      }

      var colorCubes;
      if (colorBuffer) {
        if (Array.isArray(colorBuffer)) {
          colorCubes = [];
          for (i = 0; i < colorBuffer.length; ++i) {
            colorCubes[i] = colorBuffer[i];
          }
        } else {
          colorCubes = [ colorBuffer ];
        }
      } else {
        colorCubes = Array(colorCount);
        var cubeMapParams = {
          radius: radius,
          format: colorFormat,
          type: colorType
        };
        for (i = 0; i < colorCount; ++i) {
          colorCubes[i] = textureState.createCube(cubeMapParams);
        }
      }

      // Check color cubes
      params.color = Array(colorCubes.length);
      for (i = 0; i < colorCubes.length; ++i) {
        var cube = colorCubes[i];
        check$1(
          typeof cube === 'function' && cube._reglType === 'textureCube',
          'invalid cube map');
        radius = radius || cube.width;
        check$1(
          cube.width === radius && cube.height === radius,
          'invalid cube map shape');
        params.color[i] = {
          target: GL_TEXTURE_CUBE_MAP_POSITIVE_X$1,
          data: colorCubes[i]
        };
      }

      for (i = 0; i < 6; ++i) {
        for (var j = 0; j < colorCubes.length; ++j) {
          params.color[j].target = GL_TEXTURE_CUBE_MAP_POSITIVE_X$1 + i;
        }
        // reuse depth-stencil attachments across all cube maps
        if (i > 0) {
          params.depth = faces[0].depth;
          params.stencil = faces[0].stencil;
          params.depthStencil = faces[0].depthStencil;
        }
        if (faces[i]) {
          (faces[i])(params);
        } else {
          faces[i] = createFBO(params);
        }
      }

      return extend(reglFramebufferCube, {
        width: radius,
        height: radius,
        color: colorCubes
      })
    }

    function resize (radius_) {
      var i;
      var radius = radius_ | 0;
      check$1(radius > 0 && radius <= limits.maxCubeMapSize,
        'invalid radius for cube fbo');

      if (radius === reglFramebufferCube.width) {
        return reglFramebufferCube
      }

      var colors = reglFramebufferCube.color;
      for (i = 0; i < colors.length; ++i) {
        colors[i].resize(radius);
      }

      for (i = 0; i < 6; ++i) {
        faces[i].resize(radius);
      }

      reglFramebufferCube.width = reglFramebufferCube.height = radius;

      return reglFramebufferCube
    }

    reglFramebufferCube(options);

    return extend(reglFramebufferCube, {
      faces: faces,
      resize: resize,
      _reglType: 'framebufferCube',
      destroy: function () {
        faces.forEach(function (f) {
          f.destroy();
        });
      }
    })
  }

  function restoreFramebuffers () {
    values(framebufferSet).forEach(function (fb) {
      fb.framebuffer = gl.createFramebuffer();
      updateFramebuffer(fb);
    });
  }

  return extend(framebufferState, {
    getFramebuffer: function (object) {
      if (typeof object === 'function' && object._reglType === 'framebuffer') {
        var fbo = object._framebuffer;
        if (fbo instanceof REGLFramebuffer) {
          return fbo
        }
      }
      return null
    },
    create: createFBO,
    createCube: createCubeFBO,
    clear: function () {
      values(framebufferSet).forEach(destroy);
    },
    restore: restoreFramebuffers
  })
}

var GL_FLOAT$5 = 5126;

function AttributeRecord () {
  this.state = 0;

  this.x = 0.0;
  this.y = 0.0;
  this.z = 0.0;
  this.w = 0.0;

  this.buffer = null;
  this.size = 0;
  this.normalized = false;
  this.type = GL_FLOAT$5;
  this.offset = 0;
  this.stride = 0;
  this.divisor = 0;
}

function wrapAttributeState (
  gl,
  extensions,
  limits,
  bufferState,
  stringStore) {
  var NUM_ATTRIBUTES = limits.maxAttributes;
  var attributeBindings = new Array(NUM_ATTRIBUTES);
  for (var i = 0; i < NUM_ATTRIBUTES; ++i) {
    attributeBindings[i] = new AttributeRecord();
  }

  return {
    Record: AttributeRecord,
    scope: {},
    state: attributeBindings
  }
}

var GL_FRAGMENT_SHADER = 35632;
var GL_VERTEX_SHADER = 35633;

var GL_ACTIVE_UNIFORMS = 0x8B86;
var GL_ACTIVE_ATTRIBUTES = 0x8B89;

function wrapShaderState (gl, stringStore, stats, config) {
  // ===================================================
  // glsl compilation and linking
  // ===================================================
  var fragShaders = {};
  var vertShaders = {};

  function ActiveInfo (name, id, location, info) {
    this.name = name;
    this.id = id;
    this.location = location;
    this.info = info;
  }

  function insertActiveInfo (list, info) {
    for (var i = 0; i < list.length; ++i) {
      if (list[i].id === info.id) {
        list[i].location = info.location;
        return
      }
    }
    list.push(info);
  }

  function getShader (type, id, command) {
    var cache = type === GL_FRAGMENT_SHADER ? fragShaders : vertShaders;
    var shader = cache[id];

    if (!shader) {
      var source = stringStore.str(id);
      shader = gl.createShader(type);
      gl.shaderSource(shader, source);
      gl.compileShader(shader);
      check$1.shaderError(gl, shader, source, type, command);
      cache[id] = shader;
    }

    return shader
  }

  // ===================================================
  // program linking
  // ===================================================
  var programCache = {};
  var programList = [];

  var PROGRAM_COUNTER = 0;

  function REGLProgram (fragId, vertId) {
    this.id = PROGRAM_COUNTER++;
    this.fragId = fragId;
    this.vertId = vertId;
    this.program = null;
    this.uniforms = [];
    this.attributes = [];

    if (config.profile) {
      this.stats = {
        uniformsCount: 0,
        attributesCount: 0
      };
    }
  }

  function linkProgram (desc, command) {
    var i, info;

    // -------------------------------
    // compile & link
    // -------------------------------
    var fragShader = getShader(GL_FRAGMENT_SHADER, desc.fragId);
    var vertShader = getShader(GL_VERTEX_SHADER, desc.vertId);

    var program = desc.program = gl.createProgram();
    gl.attachShader(program, fragShader);
    gl.attachShader(program, vertShader);
    gl.linkProgram(program);
    check$1.linkError(
      gl,
      program,
      stringStore.str(desc.fragId),
      stringStore.str(desc.vertId),
      command);

    // -------------------------------
    // grab uniforms
    // -------------------------------
    var numUniforms = gl.getProgramParameter(program, GL_ACTIVE_UNIFORMS);
    if (config.profile) {
      desc.stats.uniformsCount = numUniforms;
    }
    var uniforms = desc.uniforms;
    for (i = 0; i < numUniforms; ++i) {
      info = gl.getActiveUniform(program, i);
      if (info) {
        if (info.size > 1) {
          for (var j = 0; j < info.size; ++j) {
            var name = info.name.replace('[0]', '[' + j + ']');
            insertActiveInfo(uniforms, new ActiveInfo(
              name,
              stringStore.id(name),
              gl.getUniformLocation(program, name),
              info));
          }
        } else {
          insertActiveInfo(uniforms, new ActiveInfo(
            info.name,
            stringStore.id(info.name),
            gl.getUniformLocation(program, info.name),
            info));
        }
      }
    }

    // -------------------------------
    // grab attributes
    // -------------------------------
    var numAttributes = gl.getProgramParameter(program, GL_ACTIVE_ATTRIBUTES);
    if (config.profile) {
      desc.stats.attributesCount = numAttributes;
    }

    var attributes = desc.attributes;
    for (i = 0; i < numAttributes; ++i) {
      info = gl.getActiveAttrib(program, i);
      if (info) {
        insertActiveInfo(attributes, new ActiveInfo(
          info.name,
          stringStore.id(info.name),
          gl.getAttribLocation(program, info.name),
          info));
      }
    }
  }

  if (config.profile) {
    stats.getMaxUniformsCount = function () {
      var m = 0;
      programList.forEach(function (desc) {
        if (desc.stats.uniformsCount > m) {
          m = desc.stats.uniformsCount;
        }
      });
      return m
    };

    stats.getMaxAttributesCount = function () {
      var m = 0;
      programList.forEach(function (desc) {
        if (desc.stats.attributesCount > m) {
          m = desc.stats.attributesCount;
        }
      });
      return m
    };
  }

  function restoreShaders () {
    fragShaders = {};
    vertShaders = {};
    for (var i = 0; i < programList.length; ++i) {
      linkProgram(programList[i]);
    }
  }

  return {
    clear: function () {
      var deleteShader = gl.deleteShader.bind(gl);
      values(fragShaders).forEach(deleteShader);
      fragShaders = {};
      values(vertShaders).forEach(deleteShader);
      vertShaders = {};

      programList.forEach(function (desc) {
        gl.deleteProgram(desc.program);
      });
      programList.length = 0;
      programCache = {};

      stats.shaderCount = 0;
    },

    program: function (vertId, fragId, command) {
      check$1.command(vertId >= 0, 'missing vertex shader', command);
      check$1.command(fragId >= 0, 'missing fragment shader', command);

      var cache = programCache[fragId];
      if (!cache) {
        cache = programCache[fragId] = {};
      }
      var program = cache[vertId];
      if (!program) {
        program = new REGLProgram(fragId, vertId);
        stats.shaderCount++;

        linkProgram(program, command);
        cache[vertId] = program;
        programList.push(program);
      }
      return program
    },

    restore: restoreShaders,

    shader: getShader,

    frag: -1,
    vert: -1
  }
}

var GL_RGBA$2 = 6408;
var GL_UNSIGNED_BYTE$6 = 5121;
var GL_PACK_ALIGNMENT = 0x0D05;
var GL_FLOAT$6 = 0x1406; // 5126

function wrapReadPixels (
  gl,
  framebufferState,
  reglPoll,
  context,
  glAttributes,
  extensions) {
  function readPixelsImpl (input) {
    var type;
    if (framebufferState.next === null) {
      check$1(
        glAttributes.preserveDrawingBuffer,
        'you must create a webgl context with "preserveDrawingBuffer":true in order to read pixels from the drawing buffer');
      type = GL_UNSIGNED_BYTE$6;
    } else {
      check$1(
        framebufferState.next.colorAttachments[0].texture !== null,
          'You cannot read from a renderbuffer');
      type = framebufferState.next.colorAttachments[0].texture._texture.type;

      if (extensions.oes_texture_float) {
        check$1(
          type === GL_UNSIGNED_BYTE$6 || type === GL_FLOAT$6,
          'Reading from a framebuffer is only allowed for the types \'uint8\' and \'float\'');
      } else {
        check$1(
          type === GL_UNSIGNED_BYTE$6,
          'Reading from a framebuffer is only allowed for the type \'uint8\'');
      }
    }

    var x = 0;
    var y = 0;
    var width = context.framebufferWidth;
    var height = context.framebufferHeight;
    var data = null;

    if (isTypedArray(input)) {
      data = input;
    } else if (input) {
      check$1.type(input, 'object', 'invalid arguments to regl.read()');
      x = input.x | 0;
      y = input.y | 0;
      check$1(
        x >= 0 && x < context.framebufferWidth,
        'invalid x offset for regl.read');
      check$1(
        y >= 0 && y < context.framebufferHeight,
        'invalid y offset for regl.read');
      width = (input.width || (context.framebufferWidth - x)) | 0;
      height = (input.height || (context.framebufferHeight - y)) | 0;
      data = input.data || null;
    }

    // sanity check input.data
    if (data) {
      if (type === GL_UNSIGNED_BYTE$6) {
        check$1(
          data instanceof Uint8Array,
          'buffer must be \'Uint8Array\' when reading from a framebuffer of type \'uint8\'');
      } else if (type === GL_FLOAT$6) {
        check$1(
          data instanceof Float32Array,
          'buffer must be \'Float32Array\' when reading from a framebuffer of type \'float\'');
      }
    }

    check$1(
      width > 0 && width + x <= context.framebufferWidth,
      'invalid width for read pixels');
    check$1(
      height > 0 && height + y <= context.framebufferHeight,
      'invalid height for read pixels');

    // Update WebGL state
    reglPoll();

    // Compute size
    var size = width * height * 4;

    // Allocate data
    if (!data) {
      if (type === GL_UNSIGNED_BYTE$6) {
        data = new Uint8Array(size);
      } else if (type === GL_FLOAT$6) {
        data = data || new Float32Array(size);
      }
    }

    // Type check
    check$1.isTypedArray(data, 'data buffer for regl.read() must be a typedarray');
    check$1(data.byteLength >= size, 'data buffer for regl.read() too small');

    // Run read pixels
    gl.pixelStorei(GL_PACK_ALIGNMENT, 4);
    gl.readPixels(x, y, width, height, GL_RGBA$2,
                  type,
                  data);

    return data
  }

  function readPixelsFBO (options) {
    var result;
    framebufferState.setFBO({
      framebuffer: options.framebuffer
    }, function () {
      result = readPixelsImpl(options);
    });
    return result
  }

  function readPixels (options) {
    if (!options || !('framebuffer' in options)) {
      return readPixelsImpl(options)
    } else {
      return readPixelsFBO(options)
    }
  }

  return readPixels
}

function slice (x) {
  return Array.prototype.slice.call(x)
}

function join (x) {
  return slice(x).join('')
}

function createEnvironment () {
  // Unique variable id counter
  var varCounter = 0;

  // Linked values are passed from this scope into the generated code block
  // Calling link() passes a value into the generated scope and returns
  // the variable name which it is bound to
  var linkedNames = [];
  var linkedValues = [];
  function link (value) {
    for (var i = 0; i < linkedValues.length; ++i) {
      if (linkedValues[i] === value) {
        return linkedNames[i]
      }
    }

    var name = 'g' + (varCounter++);
    linkedNames.push(name);
    linkedValues.push(value);
    return name
  }

  // create a code block
  function block () {
    var code = [];
    function push () {
      code.push.apply(code, slice(arguments));
    }

    var vars = [];
    function def () {
      var name = 'v' + (varCounter++);
      vars.push(name);

      if (arguments.length > 0) {
        code.push(name, '=');
        code.push.apply(code, slice(arguments));
        code.push(';');
      }

      return name
    }

    return extend(push, {
      def: def,
      toString: function () {
        return join([
          (vars.length > 0 ? 'var ' + vars + ';' : ''),
          join(code)
        ])
      }
    })
  }

  function scope () {
    var entry = block();
    var exit = block();

    var entryToString = entry.toString;
    var exitToString = exit.toString;

    function save (object, prop) {
      exit(object, prop, '=', entry.def(object, prop), ';');
    }

    return extend(function () {
      entry.apply(entry, slice(arguments));
    }, {
      def: entry.def,
      entry: entry,
      exit: exit,
      save: save,
      set: function (object, prop, value) {
        save(object, prop);
        entry(object, prop, '=', value, ';');
      },
      toString: function () {
        return entryToString() + exitToString()
      }
    })
  }

  function conditional () {
    var pred = join(arguments);
    var thenBlock = scope();
    var elseBlock = scope();

    var thenToString = thenBlock.toString;
    var elseToString = elseBlock.toString;

    return extend(thenBlock, {
      then: function () {
        thenBlock.apply(thenBlock, slice(arguments));
        return this
      },
      else: function () {
        elseBlock.apply(elseBlock, slice(arguments));
        return this
      },
      toString: function () {
        var elseClause = elseToString();
        if (elseClause) {
          elseClause = 'else{' + elseClause + '}';
        }
        return join([
          'if(', pred, '){',
          thenToString(),
          '}', elseClause
        ])
      }
    })
  }

  // procedure list
  var globalBlock = block();
  var procedures = {};
  function proc (name, count) {
    var args = [];
    function arg () {
      var name = 'a' + args.length;
      args.push(name);
      return name
    }

    count = count || 0;
    for (var i = 0; i < count; ++i) {
      arg();
    }

    var body = scope();
    var bodyToString = body.toString;

    var result = procedures[name] = extend(body, {
      arg: arg,
      toString: function () {
        return join([
          'function(', args.join(), '){',
          bodyToString(),
          '}'
        ])
      }
    });

    return result
  }

  function compile () {
    var code = ['"use strict";',
      globalBlock,
      'return {'];
    Object.keys(procedures).forEach(function (name) {
      code.push('"', name, '":', procedures[name].toString(), ',');
    });
    code.push('}');
    var src = join(code)
      .replace(/;/g, ';\n')
      .replace(/}/g, '}\n')
      .replace(/{/g, '{\n');
    var proc = Function.apply(null, linkedNames.concat(src));
    return proc.apply(null, linkedValues)
  }

  return {
    global: globalBlock,
    link: link,
    block: block,
    proc: proc,
    scope: scope,
    cond: conditional,
    compile: compile
  }
}

// "cute" names for vector components
var CUTE_COMPONENTS = 'xyzw'.split('');

var GL_UNSIGNED_BYTE$7 = 5121;

var ATTRIB_STATE_POINTER = 1;
var ATTRIB_STATE_CONSTANT = 2;

var DYN_FUNC$1 = 0;
var DYN_PROP$1 = 1;
var DYN_CONTEXT$1 = 2;
var DYN_STATE$1 = 3;
var DYN_THUNK = 4;

var S_DITHER = 'dither';
var S_BLEND_ENABLE = 'blend.enable';
var S_BLEND_COLOR = 'blend.color';
var S_BLEND_EQUATION = 'blend.equation';
var S_BLEND_FUNC = 'blend.func';
var S_DEPTH_ENABLE = 'depth.enable';
var S_DEPTH_FUNC = 'depth.func';
var S_DEPTH_RANGE = 'depth.range';
var S_DEPTH_MASK = 'depth.mask';
var S_COLOR_MASK = 'colorMask';
var S_CULL_ENABLE = 'cull.enable';
var S_CULL_FACE = 'cull.face';
var S_FRONT_FACE = 'frontFace';
var S_LINE_WIDTH = 'lineWidth';
var S_POLYGON_OFFSET_ENABLE = 'polygonOffset.enable';
var S_POLYGON_OFFSET_OFFSET = 'polygonOffset.offset';
var S_SAMPLE_ALPHA = 'sample.alpha';
var S_SAMPLE_ENABLE = 'sample.enable';
var S_SAMPLE_COVERAGE = 'sample.coverage';
var S_STENCIL_ENABLE = 'stencil.enable';
var S_STENCIL_MASK = 'stencil.mask';
var S_STENCIL_FUNC = 'stencil.func';
var S_STENCIL_OPFRONT = 'stencil.opFront';
var S_STENCIL_OPBACK = 'stencil.opBack';
var S_SCISSOR_ENABLE = 'scissor.enable';
var S_SCISSOR_BOX = 'scissor.box';
var S_VIEWPORT = 'viewport';

var S_PROFILE = 'profile';

var S_FRAMEBUFFER = 'framebuffer';
var S_VERT = 'vert';
var S_FRAG = 'frag';
var S_ELEMENTS = 'elements';
var S_PRIMITIVE = 'primitive';
var S_COUNT = 'count';
var S_OFFSET = 'offset';
var S_INSTANCES = 'instances';

var SUFFIX_WIDTH = 'Width';
var SUFFIX_HEIGHT = 'Height';

var S_FRAMEBUFFER_WIDTH = S_FRAMEBUFFER + SUFFIX_WIDTH;
var S_FRAMEBUFFER_HEIGHT = S_FRAMEBUFFER + SUFFIX_HEIGHT;
var S_VIEWPORT_WIDTH = S_VIEWPORT + SUFFIX_WIDTH;
var S_VIEWPORT_HEIGHT = S_VIEWPORT + SUFFIX_HEIGHT;
var S_DRAWINGBUFFER = 'drawingBuffer';
var S_DRAWINGBUFFER_WIDTH = S_DRAWINGBUFFER + SUFFIX_WIDTH;
var S_DRAWINGBUFFER_HEIGHT = S_DRAWINGBUFFER + SUFFIX_HEIGHT;

var NESTED_OPTIONS = [
  S_BLEND_FUNC,
  S_BLEND_EQUATION,
  S_STENCIL_FUNC,
  S_STENCIL_OPFRONT,
  S_STENCIL_OPBACK,
  S_SAMPLE_COVERAGE,
  S_VIEWPORT,
  S_SCISSOR_BOX,
  S_POLYGON_OFFSET_OFFSET
];

var GL_ARRAY_BUFFER$1 = 34962;
var GL_ELEMENT_ARRAY_BUFFER$1 = 34963;

var GL_FRAGMENT_SHADER$1 = 35632;
var GL_VERTEX_SHADER$1 = 35633;

var GL_TEXTURE_2D$2 = 0x0DE1;
var GL_TEXTURE_CUBE_MAP$1 = 0x8513;

var GL_CULL_FACE = 0x0B44;
var GL_BLEND = 0x0BE2;
var GL_DITHER = 0x0BD0;
var GL_STENCIL_TEST = 0x0B90;
var GL_DEPTH_TEST = 0x0B71;
var GL_SCISSOR_TEST = 0x0C11;
var GL_POLYGON_OFFSET_FILL = 0x8037;
var GL_SAMPLE_ALPHA_TO_COVERAGE = 0x809E;
var GL_SAMPLE_COVERAGE = 0x80A0;

var GL_FLOAT$7 = 5126;
var GL_FLOAT_VEC2 = 35664;
var GL_FLOAT_VEC3 = 35665;
var GL_FLOAT_VEC4 = 35666;
var GL_INT$3 = 5124;
var GL_INT_VEC2 = 35667;
var GL_INT_VEC3 = 35668;
var GL_INT_VEC4 = 35669;
var GL_BOOL = 35670;
var GL_BOOL_VEC2 = 35671;
var GL_BOOL_VEC3 = 35672;
var GL_BOOL_VEC4 = 35673;
var GL_FLOAT_MAT2 = 35674;
var GL_FLOAT_MAT3 = 35675;
var GL_FLOAT_MAT4 = 35676;
var GL_SAMPLER_2D = 35678;
var GL_SAMPLER_CUBE = 35680;

var GL_TRIANGLES$1 = 4;

var GL_FRONT = 1028;
var GL_BACK = 1029;
var GL_CW = 0x0900;
var GL_CCW = 0x0901;
var GL_MIN_EXT = 0x8007;
var GL_MAX_EXT = 0x8008;
var GL_ALWAYS = 519;
var GL_KEEP = 7680;
var GL_ZERO = 0;
var GL_ONE = 1;
var GL_FUNC_ADD = 0x8006;
var GL_LESS = 513;

var GL_FRAMEBUFFER$1 = 0x8D40;
var GL_COLOR_ATTACHMENT0$1 = 0x8CE0;

var blendFuncs = {
  '0': 0,
  '1': 1,
  'zero': 0,
  'one': 1,
  'src color': 768,
  'one minus src color': 769,
  'src alpha': 770,
  'one minus src alpha': 771,
  'dst color': 774,
  'one minus dst color': 775,
  'dst alpha': 772,
  'one minus dst alpha': 773,
  'constant color': 32769,
  'one minus constant color': 32770,
  'constant alpha': 32771,
  'one minus constant alpha': 32772,
  'src alpha saturate': 776
};

// There are invalid values for srcRGB and dstRGB. See:
// https://www.khronos.org/registry/webgl/specs/1.0/#6.13
// https://github.com/KhronosGroup/WebGL/blob/0d3201f5f7ec3c0060bc1f04077461541f1987b9/conformance-suites/1.0.3/conformance/misc/webgl-specific.html#L56
var invalidBlendCombinations = [
  'constant color, constant alpha',
  'one minus constant color, constant alpha',
  'constant color, one minus constant alpha',
  'one minus constant color, one minus constant alpha',
  'constant alpha, constant color',
  'constant alpha, one minus constant color',
  'one minus constant alpha, constant color',
  'one minus constant alpha, one minus constant color'
];

var compareFuncs = {
  'never': 512,
  'less': 513,
  '<': 513,
  'equal': 514,
  '=': 514,
  '==': 514,
  '===': 514,
  'lequal': 515,
  '<=': 515,
  'greater': 516,
  '>': 516,
  'notequal': 517,
  '!=': 517,
  '!==': 517,
  'gequal': 518,
  '>=': 518,
  'always': 519
};

var stencilOps = {
  '0': 0,
  'zero': 0,
  'keep': 7680,
  'replace': 7681,
  'increment': 7682,
  'decrement': 7683,
  'increment wrap': 34055,
  'decrement wrap': 34056,
  'invert': 5386
};

var shaderType = {
  'frag': GL_FRAGMENT_SHADER$1,
  'vert': GL_VERTEX_SHADER$1
};

var orientationType = {
  'cw': GL_CW,
  'ccw': GL_CCW
};

function isBufferArgs (x) {
  return Array.isArray(x) ||
    isTypedArray(x) ||
    isNDArrayLike(x)
}

// Make sure viewport is processed first
function sortState (state) {
  return state.sort(function (a, b) {
    if (a === S_VIEWPORT) {
      return -1
    } else if (b === S_VIEWPORT) {
      return 1
    }
    return (a < b) ? -1 : 1
  })
}

function Declaration (thisDep, contextDep, propDep, append) {
  this.thisDep = thisDep;
  this.contextDep = contextDep;
  this.propDep = propDep;
  this.append = append;
}

function isStatic (decl) {
  return decl && !(decl.thisDep || decl.contextDep || decl.propDep)
}

function createStaticDecl (append) {
  return new Declaration(false, false, false, append)
}

function createDynamicDecl (dyn, append) {
  var type = dyn.type;
  if (type === DYN_FUNC$1) {
    var numArgs = dyn.data.length;
    return new Declaration(
      true,
      numArgs >= 1,
      numArgs >= 2,
      append)
  } else if (type === DYN_THUNK) {
    var data = dyn.data;
    return new Declaration(
      data.thisDep,
      data.contextDep,
      data.propDep,
      append)
  } else {
    return new Declaration(
      type === DYN_STATE$1,
      type === DYN_CONTEXT$1,
      type === DYN_PROP$1,
      append)
  }
}

var SCOPE_DECL = new Declaration(false, false, false, function () {});

function reglCore (
  gl,
  stringStore,
  extensions,
  limits,
  bufferState,
  elementState,
  textureState,
  framebufferState,
  uniformState,
  attributeState,
  shaderState,
  drawState,
  contextState,
  timer,
  config) {
  var AttributeRecord = attributeState.Record;

  var blendEquations = {
    'add': 32774,
    'subtract': 32778,
    'reverse subtract': 32779
  };
  if (extensions.ext_blend_minmax) {
    blendEquations.min = GL_MIN_EXT;
    blendEquations.max = GL_MAX_EXT;
  }

  var extInstancing = extensions.angle_instanced_arrays;
  var extDrawBuffers = extensions.webgl_draw_buffers;

  // ===================================================
  // ===================================================
  // WEBGL STATE
  // ===================================================
  // ===================================================
  var currentState = {
    dirty: true,
    profile: config.profile
  };
  var nextState = {};
  var GL_STATE_NAMES = [];
  var GL_FLAGS = {};
  var GL_VARIABLES = {};

  function propName (name) {
    return name.replace('.', '_')
  }

  function stateFlag (sname, cap, init) {
    var name = propName(sname);
    GL_STATE_NAMES.push(sname);
    nextState[name] = currentState[name] = !!init;
    GL_FLAGS[name] = cap;
  }

  function stateVariable (sname, func, init) {
    var name = propName(sname);
    GL_STATE_NAMES.push(sname);
    if (Array.isArray(init)) {
      currentState[name] = init.slice();
      nextState[name] = init.slice();
    } else {
      currentState[name] = nextState[name] = init;
    }
    GL_VARIABLES[name] = func;
  }

  // Dithering
  stateFlag(S_DITHER, GL_DITHER);

  // Blending
  stateFlag(S_BLEND_ENABLE, GL_BLEND);
  stateVariable(S_BLEND_COLOR, 'blendColor', [0, 0, 0, 0]);
  stateVariable(S_BLEND_EQUATION, 'blendEquationSeparate',
    [GL_FUNC_ADD, GL_FUNC_ADD]);
  stateVariable(S_BLEND_FUNC, 'blendFuncSeparate',
    [GL_ONE, GL_ZERO, GL_ONE, GL_ZERO]);

  // Depth
  stateFlag(S_DEPTH_ENABLE, GL_DEPTH_TEST, true);
  stateVariable(S_DEPTH_FUNC, 'depthFunc', GL_LESS);
  stateVariable(S_DEPTH_RANGE, 'depthRange', [0, 1]);
  stateVariable(S_DEPTH_MASK, 'depthMask', true);

  // Color mask
  stateVariable(S_COLOR_MASK, S_COLOR_MASK, [true, true, true, true]);

  // Face culling
  stateFlag(S_CULL_ENABLE, GL_CULL_FACE);
  stateVariable(S_CULL_FACE, 'cullFace', GL_BACK);

  // Front face orientation
  stateVariable(S_FRONT_FACE, S_FRONT_FACE, GL_CCW);

  // Line width
  stateVariable(S_LINE_WIDTH, S_LINE_WIDTH, 1);

  // Polygon offset
  stateFlag(S_POLYGON_OFFSET_ENABLE, GL_POLYGON_OFFSET_FILL);
  stateVariable(S_POLYGON_OFFSET_OFFSET, 'polygonOffset', [0, 0]);

  // Sample coverage
  stateFlag(S_SAMPLE_ALPHA, GL_SAMPLE_ALPHA_TO_COVERAGE);
  stateFlag(S_SAMPLE_ENABLE, GL_SAMPLE_COVERAGE);
  stateVariable(S_SAMPLE_COVERAGE, 'sampleCoverage', [1, false]);

  // Stencil
  stateFlag(S_STENCIL_ENABLE, GL_STENCIL_TEST);
  stateVariable(S_STENCIL_MASK, 'stencilMask', -1);
  stateVariable(S_STENCIL_FUNC, 'stencilFunc', [GL_ALWAYS, 0, -1]);
  stateVariable(S_STENCIL_OPFRONT, 'stencilOpSeparate',
    [GL_FRONT, GL_KEEP, GL_KEEP, GL_KEEP]);
  stateVariable(S_STENCIL_OPBACK, 'stencilOpSeparate',
    [GL_BACK, GL_KEEP, GL_KEEP, GL_KEEP]);

  // Scissor
  stateFlag(S_SCISSOR_ENABLE, GL_SCISSOR_TEST);
  stateVariable(S_SCISSOR_BOX, 'scissor',
    [0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight]);

  // Viewport
  stateVariable(S_VIEWPORT, S_VIEWPORT,
    [0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight]);

  // ===================================================
  // ===================================================
  // ENVIRONMENT
  // ===================================================
  // ===================================================
  var sharedState = {
    gl: gl,
    context: contextState,
    strings: stringStore,
    next: nextState,
    current: currentState,
    draw: drawState,
    elements: elementState,
    buffer: bufferState,
    shader: shaderState,
    attributes: attributeState.state,
    uniforms: uniformState,
    framebuffer: framebufferState,
    extensions: extensions,

    timer: timer,
    isBufferArgs: isBufferArgs
  };

  var sharedConstants = {
    primTypes: primTypes,
    compareFuncs: compareFuncs,
    blendFuncs: blendFuncs,
    blendEquations: blendEquations,
    stencilOps: stencilOps,
    glTypes: glTypes,
    orientationType: orientationType
  };

  check$1.optional(function () {
    sharedState.isArrayLike = isArrayLike;
  });

  if (extDrawBuffers) {
    sharedConstants.backBuffer = [GL_BACK];
    sharedConstants.drawBuffer = loop(limits.maxDrawbuffers, function (i) {
      if (i === 0) {
        return [0]
      }
      return loop(i, function (j) {
        return GL_COLOR_ATTACHMENT0$1 + j
      })
    });
  }

  var drawCallCounter = 0;
  function createREGLEnvironment () {
    var env = createEnvironment();
    var link = env.link;
    var global = env.global;
    env.id = drawCallCounter++;

    env.batchId = '0';

    // link shared state
    var SHARED = link(sharedState);
    var shared = env.shared = {
      props: 'a0'
    };
    Object.keys(sharedState).forEach(function (prop) {
      shared[prop] = global.def(SHARED, '.', prop);
    });

    // Inject runtime assertion stuff for debug builds
    check$1.optional(function () {
      env.CHECK = link(check$1);
      env.commandStr = check$1.guessCommand();
      env.command = link(env.commandStr);
      env.assert = function (block, pred, message) {
        block(
          'if(!(', pred, '))',
          this.CHECK, '.commandRaise(', link(message), ',', this.command, ');');
      };

      sharedConstants.invalidBlendCombinations = invalidBlendCombinations;
    });

    // Copy GL state variables over
    var nextVars = env.next = {};
    var currentVars = env.current = {};
    Object.keys(GL_VARIABLES).forEach(function (variable) {
      if (Array.isArray(currentState[variable])) {
        nextVars[variable] = global.def(shared.next, '.', variable);
        currentVars[variable] = global.def(shared.current, '.', variable);
      }
    });

    // Initialize shared constants
    var constants = env.constants = {};
    Object.keys(sharedConstants).forEach(function (name) {
      constants[name] = global.def(JSON.stringify(sharedConstants[name]));
    });

    // Helper function for calling a block
    env.invoke = function (block, x) {
      switch (x.type) {
        case DYN_FUNC$1:
          var argList = [
            'this',
            shared.context,
            shared.props,
            env.batchId
          ];
          return block.def(
            link(x.data), '.call(',
              argList.slice(0, Math.max(x.data.length + 1, 4)),
             ')')
        case DYN_PROP$1:
          return block.def(shared.props, x.data)
        case DYN_CONTEXT$1:
          return block.def(shared.context, x.data)
        case DYN_STATE$1:
          return block.def('this', x.data)
        case DYN_THUNK:
          x.data.append(env, block);
          return x.data.ref
      }
    };

    env.attribCache = {};

    var scopeAttribs = {};
    env.scopeAttrib = function (name) {
      var id = stringStore.id(name);
      if (id in scopeAttribs) {
        return scopeAttribs[id]
      }
      var binding = attributeState.scope[id];
      if (!binding) {
        binding = attributeState.scope[id] = new AttributeRecord();
      }
      var result = scopeAttribs[id] = link(binding);
      return result
    };

    return env
  }

  // ===================================================
  // ===================================================
  // PARSING
  // ===================================================
  // ===================================================
  function parseProfile (options) {
    var staticOptions = options.static;
    var dynamicOptions = options.dynamic;

    var profileEnable;
    if (S_PROFILE in staticOptions) {
      var value = !!staticOptions[S_PROFILE];
      profileEnable = createStaticDecl(function (env, scope) {
        return value
      });
      profileEnable.enable = value;
    } else if (S_PROFILE in dynamicOptions) {
      var dyn = dynamicOptions[S_PROFILE];
      profileEnable = createDynamicDecl(dyn, function (env, scope) {
        return env.invoke(scope, dyn)
      });
    }

    return profileEnable
  }

  function parseFramebuffer (options, env) {
    var staticOptions = options.static;
    var dynamicOptions = options.dynamic;

    if (S_FRAMEBUFFER in staticOptions) {
      var framebuffer = staticOptions[S_FRAMEBUFFER];
      if (framebuffer) {
        framebuffer = framebufferState.getFramebuffer(framebuffer);
        check$1.command(framebuffer, 'invalid framebuffer object');
        return createStaticDecl(function (env, block) {
          var FRAMEBUFFER = env.link(framebuffer);
          var shared = env.shared;
          block.set(
            shared.framebuffer,
            '.next',
            FRAMEBUFFER);
          var CONTEXT = shared.context;
          block.set(
            CONTEXT,
            '.' + S_FRAMEBUFFER_WIDTH,
            FRAMEBUFFER + '.width');
          block.set(
            CONTEXT,
            '.' + S_FRAMEBUFFER_HEIGHT,
            FRAMEBUFFER + '.height');
          return FRAMEBUFFER
        })
      } else {
        return createStaticDecl(function (env, scope) {
          var shared = env.shared;
          scope.set(
            shared.framebuffer,
            '.next',
            'null');
          var CONTEXT = shared.context;
          scope.set(
            CONTEXT,
            '.' + S_FRAMEBUFFER_WIDTH,
            CONTEXT + '.' + S_DRAWINGBUFFER_WIDTH);
          scope.set(
            CONTEXT,
            '.' + S_FRAMEBUFFER_HEIGHT,
            CONTEXT + '.' + S_DRAWINGBUFFER_HEIGHT);
          return 'null'
        })
      }
    } else if (S_FRAMEBUFFER in dynamicOptions) {
      var dyn = dynamicOptions[S_FRAMEBUFFER];
      return createDynamicDecl(dyn, function (env, scope) {
        var FRAMEBUFFER_FUNC = env.invoke(scope, dyn);
        var shared = env.shared;
        var FRAMEBUFFER_STATE = shared.framebuffer;
        var FRAMEBUFFER = scope.def(
          FRAMEBUFFER_STATE, '.getFramebuffer(', FRAMEBUFFER_FUNC, ')');

        check$1.optional(function () {
          env.assert(scope,
            '!' + FRAMEBUFFER_FUNC + '||' + FRAMEBUFFER,
            'invalid framebuffer object');
        });

        scope.set(
          FRAMEBUFFER_STATE,
          '.next',
          FRAMEBUFFER);
        var CONTEXT = shared.context;
        scope.set(
          CONTEXT,
          '.' + S_FRAMEBUFFER_WIDTH,
          FRAMEBUFFER + '?' + FRAMEBUFFER + '.width:' +
          CONTEXT + '.' + S_DRAWINGBUFFER_WIDTH);
        scope.set(
          CONTEXT,
          '.' + S_FRAMEBUFFER_HEIGHT,
          FRAMEBUFFER +
          '?' + FRAMEBUFFER + '.height:' +
          CONTEXT + '.' + S_DRAWINGBUFFER_HEIGHT);
        return FRAMEBUFFER
      })
    } else {
      return null
    }
  }

  function parseViewportScissor (options, framebuffer, env) {
    var staticOptions = options.static;
    var dynamicOptions = options.dynamic;

    function parseBox (param) {
      if (param in staticOptions) {
        var box = staticOptions[param];
        check$1.commandType(box, 'object', 'invalid ' + param, env.commandStr);

        var isStatic = true;
        var x = box.x | 0;
        var y = box.y | 0;
        var w, h;
        if ('width' in box) {
          w = box.width | 0;
          check$1.command(w >= 0, 'invalid ' + param, env.commandStr);
        } else {
          isStatic = false;
        }
        if ('height' in box) {
          h = box.height | 0;
          check$1.command(h >= 0, 'invalid ' + param, env.commandStr);
        } else {
          isStatic = false;
        }

        return new Declaration(
          !isStatic && framebuffer && framebuffer.thisDep,
          !isStatic && framebuffer && framebuffer.contextDep,
          !isStatic && framebuffer && framebuffer.propDep,
          function (env, scope) {
            var CONTEXT = env.shared.context;
            var BOX_W = w;
            if (!('width' in box)) {
              BOX_W = scope.def(CONTEXT, '.', S_FRAMEBUFFER_WIDTH, '-', x);
            }
            var BOX_H = h;
            if (!('height' in box)) {
              BOX_H = scope.def(CONTEXT, '.', S_FRAMEBUFFER_HEIGHT, '-', y);
            }
            return [x, y, BOX_W, BOX_H]
          })
      } else if (param in dynamicOptions) {
        var dynBox = dynamicOptions[param];
        var result = createDynamicDecl(dynBox, function (env, scope) {
          var BOX = env.invoke(scope, dynBox);

          check$1.optional(function () {
            env.assert(scope,
              BOX + '&&typeof ' + BOX + '==="object"',
              'invalid ' + param);
          });

          var CONTEXT = env.shared.context;
          var BOX_X = scope.def(BOX, '.x|0');
          var BOX_Y = scope.def(BOX, '.y|0');
          var BOX_W = scope.def(
            '"width" in ', BOX, '?', BOX, '.width|0:',
            '(', CONTEXT, '.', S_FRAMEBUFFER_WIDTH, '-', BOX_X, ')');
          var BOX_H = scope.def(
            '"height" in ', BOX, '?', BOX, '.height|0:',
            '(', CONTEXT, '.', S_FRAMEBUFFER_HEIGHT, '-', BOX_Y, ')');

          check$1.optional(function () {
            env.assert(scope,
              BOX_W + '>=0&&' +
              BOX_H + '>=0',
              'invalid ' + param);
          });

          return [BOX_X, BOX_Y, BOX_W, BOX_H]
        });
        if (framebuffer) {
          result.thisDep = result.thisDep || framebuffer.thisDep;
          result.contextDep = result.contextDep || framebuffer.contextDep;
          result.propDep = result.propDep || framebuffer.propDep;
        }
        return result
      } else if (framebuffer) {
        return new Declaration(
          framebuffer.thisDep,
          framebuffer.contextDep,
          framebuffer.propDep,
          function (env, scope) {
            var CONTEXT = env.shared.context;
            return [
              0, 0,
              scope.def(CONTEXT, '.', S_FRAMEBUFFER_WIDTH),
              scope.def(CONTEXT, '.', S_FRAMEBUFFER_HEIGHT)]
          })
      } else {
        return null
      }
    }

    var viewport = parseBox(S_VIEWPORT);

    if (viewport) {
      var prevViewport = viewport;
      viewport = new Declaration(
        viewport.thisDep,
        viewport.contextDep,
        viewport.propDep,
        function (env, scope) {
          var VIEWPORT = prevViewport.append(env, scope);
          var CONTEXT = env.shared.context;
          scope.set(
            CONTEXT,
            '.' + S_VIEWPORT_WIDTH,
            VIEWPORT[2]);
          scope.set(
            CONTEXT,
            '.' + S_VIEWPORT_HEIGHT,
            VIEWPORT[3]);
          return VIEWPORT
        });
    }

    return {
      viewport: viewport,
      scissor_box: parseBox(S_SCISSOR_BOX)
    }
  }

  function parseProgram (options) {
    var staticOptions = options.static;
    var dynamicOptions = options.dynamic;

    function parseShader (name) {
      if (name in staticOptions) {
        var id = stringStore.id(staticOptions[name]);
        check$1.optional(function () {
          shaderState.shader(shaderType[name], id, check$1.guessCommand());
        });
        var result = createStaticDecl(function () {
          return id
        });
        result.id = id;
        return result
      } else if (name in dynamicOptions) {
        var dyn = dynamicOptions[name];
        return createDynamicDecl(dyn, function (env, scope) {
          var str = env.invoke(scope, dyn);
          var id = scope.def(env.shared.strings, '.id(', str, ')');
          check$1.optional(function () {
            scope(
              env.shared.shader, '.shader(',
              shaderType[name], ',',
              id, ',',
              env.command, ');');
          });
          return id
        })
      }
      return null
    }

    var frag = parseShader(S_FRAG);
    var vert = parseShader(S_VERT);

    var program = null;
    var progVar;
    if (isStatic(frag) && isStatic(vert)) {
      program = shaderState.program(vert.id, frag.id);
      progVar = createStaticDecl(function (env, scope) {
        return env.link(program)
      });
    } else {
      progVar = new Declaration(
        (frag && frag.thisDep) || (vert && vert.thisDep),
        (frag && frag.contextDep) || (vert && vert.contextDep),
        (frag && frag.propDep) || (vert && vert.propDep),
        function (env, scope) {
          var SHADER_STATE = env.shared.shader;
          var fragId;
          if (frag) {
            fragId = frag.append(env, scope);
          } else {
            fragId = scope.def(SHADER_STATE, '.', S_FRAG);
          }
          var vertId;
          if (vert) {
            vertId = vert.append(env, scope);
          } else {
            vertId = scope.def(SHADER_STATE, '.', S_VERT);
          }
          var progDef = SHADER_STATE + '.program(' + vertId + ',' + fragId;
          check$1.optional(function () {
            progDef += ',' + env.command;
          });
          return scope.def(progDef + ')')
        });
    }

    return {
      frag: frag,
      vert: vert,
      progVar: progVar,
      program: program
    }
  }

  function parseDraw (options, env) {
    var staticOptions = options.static;
    var dynamicOptions = options.dynamic;

    function parseElements () {
      if (S_ELEMENTS in staticOptions) {
        var elements = staticOptions[S_ELEMENTS];
        if (isBufferArgs(elements)) {
          elements = elementState.getElements(elementState.create(elements, true));
        } else if (elements) {
          elements = elementState.getElements(elements);
          check$1.command(elements, 'invalid elements', env.commandStr);
        }
        var result = createStaticDecl(function (env, scope) {
          if (elements) {
            var result = env.link(elements);
            env.ELEMENTS = result;
            return result
          }
          env.ELEMENTS = null;
          return null
        });
        result.value = elements;
        return result
      } else if (S_ELEMENTS in dynamicOptions) {
        var dyn = dynamicOptions[S_ELEMENTS];
        return createDynamicDecl(dyn, function (env, scope) {
          var shared = env.shared;

          var IS_BUFFER_ARGS = shared.isBufferArgs;
          var ELEMENT_STATE = shared.elements;

          var elementDefn = env.invoke(scope, dyn);
          var elements = scope.def('null');
          var elementStream = scope.def(IS_BUFFER_ARGS, '(', elementDefn, ')');

          var ifte = env.cond(elementStream)
            .then(elements, '=', ELEMENT_STATE, '.createStream(', elementDefn, ');')
            .else(elements, '=', ELEMENT_STATE, '.getElements(', elementDefn, ');');

          check$1.optional(function () {
            env.assert(ifte.else,
              '!' + elementDefn + '||' + elements,
              'invalid elements');
          });

          scope.entry(ifte);
          scope.exit(
            env.cond(elementStream)
              .then(ELEMENT_STATE, '.destroyStream(', elements, ');'));

          env.ELEMENTS = elements;

          return elements
        })
      }

      return null
    }

    var elements = parseElements();

    function parsePrimitive () {
      if (S_PRIMITIVE in staticOptions) {
        var primitive = staticOptions[S_PRIMITIVE];
        check$1.commandParameter(primitive, primTypes, 'invalid primitve', env.commandStr);
        return createStaticDecl(function (env, scope) {
          return primTypes[primitive]
        })
      } else if (S_PRIMITIVE in dynamicOptions) {
        var dynPrimitive = dynamicOptions[S_PRIMITIVE];
        return createDynamicDecl(dynPrimitive, function (env, scope) {
          var PRIM_TYPES = env.constants.primTypes;
          var prim = env.invoke(scope, dynPrimitive);
          check$1.optional(function () {
            env.assert(scope,
              prim + ' in ' + PRIM_TYPES,
              'invalid primitive, must be one of ' + Object.keys(primTypes));
          });
          return scope.def(PRIM_TYPES, '[', prim, ']')
        })
      } else if (elements) {
        if (isStatic(elements)) {
          if (elements.value) {
            return createStaticDecl(function (env, scope) {
              return scope.def(env.ELEMENTS, '.primType')
            })
          } else {
            return createStaticDecl(function () {
              return GL_TRIANGLES$1
            })
          }
        } else {
          return new Declaration(
            elements.thisDep,
            elements.contextDep,
            elements.propDep,
            function (env, scope) {
              var elements = env.ELEMENTS;
              return scope.def(elements, '?', elements, '.primType:', GL_TRIANGLES$1)
            })
        }
      }
      return null
    }

    function parseParam (param, isOffset) {
      if (param in staticOptions) {
        var value = staticOptions[param] | 0;
        check$1.command(!isOffset || value >= 0, 'invalid ' + param, env.commandStr);
        return createStaticDecl(function (env, scope) {
          if (isOffset) {
            env.OFFSET = value;
          }
          return value
        })
      } else if (param in dynamicOptions) {
        var dynValue = dynamicOptions[param];
        return createDynamicDecl(dynValue, function (env, scope) {
          var result = env.invoke(scope, dynValue);
          if (isOffset) {
            env.OFFSET = result;
            check$1.optional(function () {
              env.assert(scope,
                result + '>=0',
                'invalid ' + param);
            });
          }
          return result
        })
      } else if (isOffset && elements) {
        return createStaticDecl(function (env, scope) {
          env.OFFSET = '0';
          return 0
        })
      }
      return null
    }

    var OFFSET = parseParam(S_OFFSET, true);

    function parseVertCount () {
      if (S_COUNT in staticOptions) {
        var count = staticOptions[S_COUNT] | 0;
        check$1.command(
          typeof count === 'number' && count >= 0, 'invalid vertex count', env.commandStr);
        return createStaticDecl(function () {
          return count
        })
      } else if (S_COUNT in dynamicOptions) {
        var dynCount = dynamicOptions[S_COUNT];
        return createDynamicDecl(dynCount, function (env, scope) {
          var result = env.invoke(scope, dynCount);
          check$1.optional(function () {
            env.assert(scope,
              'typeof ' + result + '==="number"&&' +
              result + '>=0&&' +
              result + '===(' + result + '|0)',
              'invalid vertex count');
          });
          return result
        })
      } else if (elements) {
        if (isStatic(elements)) {
          if (elements) {
            if (OFFSET) {
              return new Declaration(
                OFFSET.thisDep,
                OFFSET.contextDep,
                OFFSET.propDep,
                function (env, scope) {
                  var result = scope.def(
                    env.ELEMENTS, '.vertCount-', env.OFFSET);

                  check$1.optional(function () {
                    env.assert(scope,
                      result + '>=0',
                      'invalid vertex offset/element buffer too small');
                  });

                  return result
                })
            } else {
              return createStaticDecl(function (env, scope) {
                return scope.def(env.ELEMENTS, '.vertCount')
              })
            }
          } else {
            var result = createStaticDecl(function () {
              return -1
            });
            check$1.optional(function () {
              result.MISSING = true;
            });
            return result
          }
        } else {
          var variable = new Declaration(
            elements.thisDep || OFFSET.thisDep,
            elements.contextDep || OFFSET.contextDep,
            elements.propDep || OFFSET.propDep,
            function (env, scope) {
              var elements = env.ELEMENTS;
              if (env.OFFSET) {
                return scope.def(elements, '?', elements, '.vertCount-',
                  env.OFFSET, ':-1')
              }
              return scope.def(elements, '?', elements, '.vertCount:-1')
            });
          check$1.optional(function () {
            variable.DYNAMIC = true;
          });
          return variable
        }
      }
      return null
    }

    return {
      elements: elements,
      primitive: parsePrimitive(),
      count: parseVertCount(),
      instances: parseParam(S_INSTANCES, false),
      offset: OFFSET
    }
  }

  function parseGLState (options, env) {
    var staticOptions = options.static;
    var dynamicOptions = options.dynamic;

    var STATE = {};

    GL_STATE_NAMES.forEach(function (prop) {
      var param = propName(prop);

      function parseParam (parseStatic, parseDynamic) {
        if (prop in staticOptions) {
          var value = parseStatic(staticOptions[prop]);
          STATE[param] = createStaticDecl(function () {
            return value
          });
        } else if (prop in dynamicOptions) {
          var dyn = dynamicOptions[prop];
          STATE[param] = createDynamicDecl(dyn, function (env, scope) {
            return parseDynamic(env, scope, env.invoke(scope, dyn))
          });
        }
      }

      switch (prop) {
        case S_CULL_ENABLE:
        case S_BLEND_ENABLE:
        case S_DITHER:
        case S_STENCIL_ENABLE:
        case S_DEPTH_ENABLE:
        case S_SCISSOR_ENABLE:
        case S_POLYGON_OFFSET_ENABLE:
        case S_SAMPLE_ALPHA:
        case S_SAMPLE_ENABLE:
        case S_DEPTH_MASK:
          return parseParam(
            function (value) {
              check$1.commandType(value, 'boolean', prop, env.commandStr);
              return value
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  'typeof ' + value + '==="boolean"',
                  'invalid flag ' + prop, env.commandStr);
              });
              return value
            })

        case S_DEPTH_FUNC:
          return parseParam(
            function (value) {
              check$1.commandParameter(value, compareFuncs, 'invalid ' + prop, env.commandStr);
              return compareFuncs[value]
            },
            function (env, scope, value) {
              var COMPARE_FUNCS = env.constants.compareFuncs;
              check$1.optional(function () {
                env.assert(scope,
                  value + ' in ' + COMPARE_FUNCS,
                  'invalid ' + prop + ', must be one of ' + Object.keys(compareFuncs));
              });
              return scope.def(COMPARE_FUNCS, '[', value, ']')
            })

        case S_DEPTH_RANGE:
          return parseParam(
            function (value) {
              check$1.command(
                isArrayLike(value) &&
                value.length === 2 &&
                typeof value[0] === 'number' &&
                typeof value[1] === 'number' &&
                value[0] <= value[1],
                'depth range is 2d array',
                env.commandStr);
              return value
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  env.shared.isArrayLike + '(' + value + ')&&' +
                  value + '.length===2&&' +
                  'typeof ' + value + '[0]==="number"&&' +
                  'typeof ' + value + '[1]==="number"&&' +
                  value + '[0]<=' + value + '[1]',
                  'depth range must be a 2d array');
              });

              var Z_NEAR = scope.def('+', value, '[0]');
              var Z_FAR = scope.def('+', value, '[1]');
              return [Z_NEAR, Z_FAR]
            })

        case S_BLEND_FUNC:
          return parseParam(
            function (value) {
              check$1.commandType(value, 'object', 'blend.func', env.commandStr);
              var srcRGB = ('srcRGB' in value ? value.srcRGB : value.src);
              var srcAlpha = ('srcAlpha' in value ? value.srcAlpha : value.src);
              var dstRGB = ('dstRGB' in value ? value.dstRGB : value.dst);
              var dstAlpha = ('dstAlpha' in value ? value.dstAlpha : value.dst);
              check$1.commandParameter(srcRGB, blendFuncs, param + '.srcRGB', env.commandStr);
              check$1.commandParameter(srcAlpha, blendFuncs, param + '.srcAlpha', env.commandStr);
              check$1.commandParameter(dstRGB, blendFuncs, param + '.dstRGB', env.commandStr);
              check$1.commandParameter(dstAlpha, blendFuncs, param + '.dstAlpha', env.commandStr);

              check$1.command(
                (invalidBlendCombinations.indexOf(srcRGB + ', ' + dstRGB) === -1),
                'unallowed blending combination (srcRGB, dstRGB) = (' + srcRGB + ', ' + dstRGB + ')', env.commandStr);

              return [
                blendFuncs[srcRGB],
                blendFuncs[dstRGB],
                blendFuncs[srcAlpha],
                blendFuncs[dstAlpha]
              ]
            },
            function (env, scope, value) {
              var BLEND_FUNCS = env.constants.blendFuncs;

              check$1.optional(function () {
                env.assert(scope,
                  value + '&&typeof ' + value + '==="object"',
                  'invalid blend func, must be an object');
              });

              function read (prefix, suffix) {
                var func = scope.def(
                  '"', prefix, suffix, '" in ', value,
                  '?', value, '.', prefix, suffix,
                  ':', value, '.', prefix);

                check$1.optional(function () {
                  env.assert(scope,
                    func + ' in ' + BLEND_FUNCS,
                    'invalid ' + prop + '.' + prefix + suffix + ', must be one of ' + Object.keys(blendFuncs));
                });

                return func
              }

              var srcRGB = read('src', 'RGB');
              var dstRGB = read('dst', 'RGB');

              check$1.optional(function () {
                var INVALID_BLEND_COMBINATIONS = env.constants.invalidBlendCombinations;

                env.assert(scope,
                           INVALID_BLEND_COMBINATIONS +
                           '.indexOf(' + srcRGB + '+", "+' + dstRGB + ') === -1 ',
                           'unallowed blending combination for (srcRGB, dstRGB)'
                          );
              });

              var SRC_RGB = scope.def(BLEND_FUNCS, '[', srcRGB, ']');
              var SRC_ALPHA = scope.def(BLEND_FUNCS, '[', read('src', 'Alpha'), ']');
              var DST_RGB = scope.def(BLEND_FUNCS, '[', dstRGB, ']');
              var DST_ALPHA = scope.def(BLEND_FUNCS, '[', read('dst', 'Alpha'), ']');

              return [SRC_RGB, DST_RGB, SRC_ALPHA, DST_ALPHA]
            })

        case S_BLEND_EQUATION:
          return parseParam(
            function (value) {
              if (typeof value === 'string') {
                check$1.commandParameter(value, blendEquations, 'invalid ' + prop, env.commandStr);
                return [
                  blendEquations[value],
                  blendEquations[value]
                ]
              } else if (typeof value === 'object') {
                check$1.commandParameter(
                  value.rgb, blendEquations, prop + '.rgb', env.commandStr);
                check$1.commandParameter(
                  value.alpha, blendEquations, prop + '.alpha', env.commandStr);
                return [
                  blendEquations[value.rgb],
                  blendEquations[value.alpha]
                ]
              } else {
                check$1.commandRaise('invalid blend.equation', env.commandStr);
              }
            },
            function (env, scope, value) {
              var BLEND_EQUATIONS = env.constants.blendEquations;

              var RGB = scope.def();
              var ALPHA = scope.def();

              var ifte = env.cond('typeof ', value, '==="string"');

              check$1.optional(function () {
                function checkProp (block, name, value) {
                  env.assert(block,
                    value + ' in ' + BLEND_EQUATIONS,
                    'invalid ' + name + ', must be one of ' + Object.keys(blendEquations));
                }
                checkProp(ifte.then, prop, value);

                env.assert(ifte.else,
                  value + '&&typeof ' + value + '==="object"',
                  'invalid ' + prop);
                checkProp(ifte.else, prop + '.rgb', value + '.rgb');
                checkProp(ifte.else, prop + '.alpha', value + '.alpha');
              });

              ifte.then(
                RGB, '=', ALPHA, '=', BLEND_EQUATIONS, '[', value, '];');
              ifte.else(
                RGB, '=', BLEND_EQUATIONS, '[', value, '.rgb];',
                ALPHA, '=', BLEND_EQUATIONS, '[', value, '.alpha];');

              scope(ifte);

              return [RGB, ALPHA]
            })

        case S_BLEND_COLOR:
          return parseParam(
            function (value) {
              check$1.command(
                isArrayLike(value) &&
                value.length === 4,
                'blend.color must be a 4d array', env.commandStr);
              return loop(4, function (i) {
                return +value[i]
              })
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  env.shared.isArrayLike + '(' + value + ')&&' +
                  value + '.length===4',
                  'blend.color must be a 4d array');
              });
              return loop(4, function (i) {
                return scope.def('+', value, '[', i, ']')
              })
            })

        case S_STENCIL_MASK:
          return parseParam(
            function (value) {
              check$1.commandType(value, 'number', param, env.commandStr);
              return value | 0
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  'typeof ' + value + '==="number"',
                  'invalid stencil.mask');
              });
              return scope.def(value, '|0')
            })

        case S_STENCIL_FUNC:
          return parseParam(
            function (value) {
              check$1.commandType(value, 'object', param, env.commandStr);
              var cmp = value.cmp || 'keep';
              var ref = value.ref || 0;
              var mask = 'mask' in value ? value.mask : -1;
              check$1.commandParameter(cmp, compareFuncs, prop + '.cmp', env.commandStr);
              check$1.commandType(ref, 'number', prop + '.ref', env.commandStr);
              check$1.commandType(mask, 'number', prop + '.mask', env.commandStr);
              return [
                compareFuncs[cmp],
                ref,
                mask
              ]
            },
            function (env, scope, value) {
              var COMPARE_FUNCS = env.constants.compareFuncs;
              check$1.optional(function () {
                function assert () {
                  env.assert(scope,
                    Array.prototype.join.call(arguments, ''),
                    'invalid stencil.func');
                }
                assert(value + '&&typeof ', value, '==="object"');
                assert('!("cmp" in ', value, ')||(',
                  value, '.cmp in ', COMPARE_FUNCS, ')');
              });
              var cmp = scope.def(
                '"cmp" in ', value,
                '?', COMPARE_FUNCS, '[', value, '.cmp]',
                ':', GL_KEEP);
              var ref = scope.def(value, '.ref|0');
              var mask = scope.def(
                '"mask" in ', value,
                '?', value, '.mask|0:-1');
              return [cmp, ref, mask]
            })

        case S_STENCIL_OPFRONT:
        case S_STENCIL_OPBACK:
          return parseParam(
            function (value) {
              check$1.commandType(value, 'object', param, env.commandStr);
              var fail = value.fail || 'keep';
              var zfail = value.zfail || 'keep';
              var zpass = value.zpass || 'keep';
              check$1.commandParameter(fail, stencilOps, prop + '.fail', env.commandStr);
              check$1.commandParameter(zfail, stencilOps, prop + '.zfail', env.commandStr);
              check$1.commandParameter(zpass, stencilOps, prop + '.zpass', env.commandStr);
              return [
                prop === S_STENCIL_OPBACK ? GL_BACK : GL_FRONT,
                stencilOps[fail],
                stencilOps[zfail],
                stencilOps[zpass]
              ]
            },
            function (env, scope, value) {
              var STENCIL_OPS = env.constants.stencilOps;

              check$1.optional(function () {
                env.assert(scope,
                  value + '&&typeof ' + value + '==="object"',
                  'invalid ' + prop);
              });

              function read (name) {
                check$1.optional(function () {
                  env.assert(scope,
                    '!("' + name + '" in ' + value + ')||' +
                    '(' + value + '.' + name + ' in ' + STENCIL_OPS + ')',
                    'invalid ' + prop + '.' + name + ', must be one of ' + Object.keys(stencilOps));
                });

                return scope.def(
                  '"', name, '" in ', value,
                  '?', STENCIL_OPS, '[', value, '.', name, ']:',
                  GL_KEEP)
              }

              return [
                prop === S_STENCIL_OPBACK ? GL_BACK : GL_FRONT,
                read('fail'),
                read('zfail'),
                read('zpass')
              ]
            })

        case S_POLYGON_OFFSET_OFFSET:
          return parseParam(
            function (value) {
              check$1.commandType(value, 'object', param, env.commandStr);
              var factor = value.factor | 0;
              var units = value.units | 0;
              check$1.commandType(factor, 'number', param + '.factor', env.commandStr);
              check$1.commandType(units, 'number', param + '.units', env.commandStr);
              return [factor, units]
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  value + '&&typeof ' + value + '==="object"',
                  'invalid ' + prop);
              });

              var FACTOR = scope.def(value, '.factor|0');
              var UNITS = scope.def(value, '.units|0');

              return [FACTOR, UNITS]
            })

        case S_CULL_FACE:
          return parseParam(
            function (value) {
              var face = 0;
              if (value === 'front') {
                face = GL_FRONT;
              } else if (value === 'back') {
                face = GL_BACK;
              }
              check$1.command(!!face, param, env.commandStr);
              return face
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  value + '==="front"||' +
                  value + '==="back"',
                  'invalid cull.face');
              });
              return scope.def(value, '==="front"?', GL_FRONT, ':', GL_BACK)
            })

        case S_LINE_WIDTH:
          return parseParam(
            function (value) {
              check$1.command(
                typeof value === 'number' &&
                value >= limits.lineWidthDims[0] &&
                value <= limits.lineWidthDims[1],
                'invalid line width, must positive number between ' +
                limits.lineWidthDims[0] + ' and ' + limits.lineWidthDims[1], env.commandStr);
              return value
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  'typeof ' + value + '==="number"&&' +
                  value + '>=' + limits.lineWidthDims[0] + '&&' +
                  value + '<=' + limits.lineWidthDims[1],
                  'invalid line width');
              });

              return value
            })

        case S_FRONT_FACE:
          return parseParam(
            function (value) {
              check$1.commandParameter(value, orientationType, param, env.commandStr);
              return orientationType[value]
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  value + '==="cw"||' +
                  value + '==="ccw"',
                  'invalid frontFace, must be one of cw,ccw');
              });
              return scope.def(value + '==="cw"?' + GL_CW + ':' + GL_CCW)
            })

        case S_COLOR_MASK:
          return parseParam(
            function (value) {
              check$1.command(
                isArrayLike(value) && value.length === 4,
                'color.mask must be length 4 array', env.commandStr);
              return value.map(function (v) { return !!v })
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  env.shared.isArrayLike + '(' + value + ')&&' +
                  value + '.length===4',
                  'invalid color.mask');
              });
              return loop(4, function (i) {
                return '!!' + value + '[' + i + ']'
              })
            })

        case S_SAMPLE_COVERAGE:
          return parseParam(
            function (value) {
              check$1.command(typeof value === 'object' && value, param, env.commandStr);
              var sampleValue = 'value' in value ? value.value : 1;
              var sampleInvert = !!value.invert;
              check$1.command(
                typeof sampleValue === 'number' &&
                sampleValue >= 0 && sampleValue <= 1,
                'sample.coverage.value must be a number between 0 and 1', env.commandStr);
              return [sampleValue, sampleInvert]
            },
            function (env, scope, value) {
              check$1.optional(function () {
                env.assert(scope,
                  value + '&&typeof ' + value + '==="object"',
                  'invalid sample.coverage');
              });
              var VALUE = scope.def(
                '"value" in ', value, '?+', value, '.value:1');
              var INVERT = scope.def('!!', value, '.invert');
              return [VALUE, INVERT]
            })
      }
    });

    return STATE
  }

  function parseUniforms (uniforms, env) {
    var staticUniforms = uniforms.static;
    var dynamicUniforms = uniforms.dynamic;

    var UNIFORMS = {};

    Object.keys(staticUniforms).forEach(function (name) {
      var value = staticUniforms[name];
      var result;
      if (typeof value === 'number' ||
          typeof value === 'boolean') {
        result = createStaticDecl(function () {
          return value
        });
      } else if (typeof value === 'function') {
        var reglType = value._reglType;
        if (reglType === 'texture2d' ||
            reglType === 'textureCube') {
          result = createStaticDecl(function (env) {
            return env.link(value)
          });
        } else if (reglType === 'framebuffer' ||
                   reglType === 'framebufferCube') {
          check$1.command(value.color.length > 0,
            'missing color attachment for framebuffer sent to uniform "' + name + '"', env.commandStr);
          result = createStaticDecl(function (env) {
            return env.link(value.color[0])
          });
        } else {
          check$1.commandRaise('invalid data for uniform "' + name + '"', env.commandStr);
        }
      } else if (isArrayLike(value)) {
        result = createStaticDecl(function (env) {
          var ITEM = env.global.def('[',
            loop(value.length, function (i) {
              check$1.command(
                typeof value[i] === 'number' ||
                typeof value[i] === 'boolean',
                'invalid uniform ' + name, env.commandStr);
              return value[i]
            }), ']');
          return ITEM
        });
      } else {
        check$1.commandRaise('invalid or missing data for uniform "' + name + '"', env.commandStr);
      }
      result.value = value;
      UNIFORMS[name] = result;
    });

    Object.keys(dynamicUniforms).forEach(function (key) {
      var dyn = dynamicUniforms[key];
      UNIFORMS[key] = createDynamicDecl(dyn, function (env, scope) {
        return env.invoke(scope, dyn)
      });
    });

    return UNIFORMS
  }

  function parseAttributes (attributes, env) {
    var staticAttributes = attributes.static;
    var dynamicAttributes = attributes.dynamic;

    var attributeDefs = {};

    Object.keys(staticAttributes).forEach(function (attribute) {
      var value = staticAttributes[attribute];
      var id = stringStore.id(attribute);

      var record = new AttributeRecord();
      if (isBufferArgs(value)) {
        record.state = ATTRIB_STATE_POINTER;
        record.buffer = bufferState.getBuffer(
          bufferState.create(value, GL_ARRAY_BUFFER$1, false, true));
        record.type = 0;
      } else {
        var buffer = bufferState.getBuffer(value);
        if (buffer) {
          record.state = ATTRIB_STATE_POINTER;
          record.buffer = buffer;
          record.type = 0;
        } else {
          check$1.command(typeof value === 'object' && value,
            'invalid data for attribute ' + attribute, env.commandStr);
          if (value.constant) {
            var constant = value.constant;
            record.buffer = 'null';
            record.state = ATTRIB_STATE_CONSTANT;
            if (typeof constant === 'number') {
              record.x = constant;
            } else {
              check$1.command(
                isArrayLike(constant) &&
                constant.length > 0 &&
                constant.length <= 4,
                'invalid constant for attribute ' + attribute, env.commandStr);
              CUTE_COMPONENTS.forEach(function (c, i) {
                if (i < constant.length) {
                  record[c] = constant[i];
                }
              });
            }
          } else {
            if (isBufferArgs(value.buffer)) {
              buffer = bufferState.getBuffer(
                bufferState.create(value.buffer, GL_ARRAY_BUFFER$1, false, true));
            } else {
              buffer = bufferState.getBuffer(value.buffer);
            }
            check$1.command(!!buffer, 'missing buffer for attribute "' + attribute + '"', env.commandStr);

            var offset = value.offset | 0;
            check$1.command(offset >= 0,
              'invalid offset for attribute "' + attribute + '"', env.commandStr);

            var stride = value.stride | 0;
            check$1.command(stride >= 0 && stride < 256,
              'invalid stride for attribute "' + attribute + '", must be integer betweeen [0, 255]', env.commandStr);

            var size = value.size | 0;
            check$1.command(!('size' in value) || (size > 0 && size <= 4),
              'invalid size for attribute "' + attribute + '", must be 1,2,3,4', env.commandStr);

            var normalized = !!value.normalized;

            var type = 0;
            if ('type' in value) {
              check$1.commandParameter(
                value.type, glTypes,
                'invalid type for attribute ' + attribute, env.commandStr);
              type = glTypes[value.type];
            }

            var divisor = value.divisor | 0;
            if ('divisor' in value) {
              check$1.command(divisor === 0 || extInstancing,
                'cannot specify divisor for attribute "' + attribute + '", instancing not supported', env.commandStr);
              check$1.command(divisor >= 0,
                'invalid divisor for attribute "' + attribute + '"', env.commandStr);
            }

            check$1.optional(function () {
              var command = env.commandStr;

              var VALID_KEYS = [
                'buffer',
                'offset',
                'divisor',
                'normalized',
                'type',
                'size',
                'stride'
              ];

              Object.keys(value).forEach(function (prop) {
                check$1.command(
                  VALID_KEYS.indexOf(prop) >= 0,
                  'unknown parameter "' + prop + '" for attribute pointer "' + attribute + '" (valid parameters are ' + VALID_KEYS + ')',
                  command);
              });
            });

            record.buffer = buffer;
            record.state = ATTRIB_STATE_POINTER;
            record.size = size;
            record.normalized = normalized;
            record.type = type || buffer.dtype;
            record.offset = offset;
            record.stride = stride;
            record.divisor = divisor;
          }
        }
      }

      attributeDefs[attribute] = createStaticDecl(function (env, scope) {
        var cache = env.attribCache;
        if (id in cache) {
          return cache[id]
        }
        var result = {
          isStream: false
        };
        Object.keys(record).forEach(function (key) {
          result[key] = record[key];
        });
        if (record.buffer) {
          result.buffer = env.link(record.buffer);
          result.type = result.type || (result.buffer + '.dtype');
        }
        cache[id] = result;
        return result
      });
    });

    Object.keys(dynamicAttributes).forEach(function (attribute) {
      var dyn = dynamicAttributes[attribute];

      function appendAttributeCode (env, block) {
        var VALUE = env.invoke(block, dyn);

        var shared = env.shared;

        var IS_BUFFER_ARGS = shared.isBufferArgs;
        var BUFFER_STATE = shared.buffer;

        // Perform validation on attribute
        check$1.optional(function () {
          env.assert(block,
            VALUE + '&&(typeof ' + VALUE + '==="object"||typeof ' +
            VALUE + '==="function")&&(' +
            IS_BUFFER_ARGS + '(' + VALUE + ')||' +
            BUFFER_STATE + '.getBuffer(' + VALUE + ')||' +
            BUFFER_STATE + '.getBuffer(' + VALUE + '.buffer)||' +
            IS_BUFFER_ARGS + '(' + VALUE + '.buffer)||' +
            '("constant" in ' + VALUE +
            '&&(typeof ' + VALUE + '.constant==="number"||' +
            shared.isArrayLike + '(' + VALUE + '.constant))))',
            'invalid dynamic attribute "' + attribute + '"');
        });

        // allocate names for result
        var result = {
          isStream: block.def(false)
        };
        var defaultRecord = new AttributeRecord();
        defaultRecord.state = ATTRIB_STATE_POINTER;
        Object.keys(defaultRecord).forEach(function (key) {
          result[key] = block.def('' + defaultRecord[key]);
        });

        var BUFFER = result.buffer;
        var TYPE = result.type;
        block(
          'if(', IS_BUFFER_ARGS, '(', VALUE, ')){',
          result.isStream, '=true;',
          BUFFER, '=', BUFFER_STATE, '.createStream(', GL_ARRAY_BUFFER$1, ',', VALUE, ');',
          TYPE, '=', BUFFER, '.dtype;',
          '}else{',
          BUFFER, '=', BUFFER_STATE, '.getBuffer(', VALUE, ');',
          'if(', BUFFER, '){',
          TYPE, '=', BUFFER, '.dtype;',
          '}else if("constant" in ', VALUE, '){',
          result.state, '=', ATTRIB_STATE_CONSTANT, ';',
          'if(typeof ' + VALUE + '.constant === "number"){',
          result[CUTE_COMPONENTS[0]], '=', VALUE, '.constant;',
          CUTE_COMPONENTS.slice(1).map(function (n) {
            return result[n]
          }).join('='), '=0;',
          '}else{',
          CUTE_COMPONENTS.map(function (name, i) {
            return (
              result[name] + '=' + VALUE + '.constant.length>=' + i +
              '?' + VALUE + '.constant[' + i + ']:0;'
            )
          }).join(''),
          '}}else{',
          'if(', IS_BUFFER_ARGS, '(', VALUE, '.buffer)){',
          BUFFER, '=', BUFFER_STATE, '.createStream(', GL_ARRAY_BUFFER$1, ',', VALUE, '.buffer);',
          '}else{',
          BUFFER, '=', BUFFER_STATE, '.getBuffer(', VALUE, '.buffer);',
          '}',
          TYPE, '="type" in ', VALUE, '?',
          shared.glTypes, '[', VALUE, '.type]:', BUFFER, '.dtype;',
          result.normalized, '=!!', VALUE, '.normalized;');
        function emitReadRecord (name) {
          block(result[name], '=', VALUE, '.', name, '|0;');
        }
        emitReadRecord('size');
        emitReadRecord('offset');
        emitReadRecord('stride');
        emitReadRecord('divisor');

        block('}}');

        block.exit(
          'if(', result.isStream, '){',
          BUFFER_STATE, '.destroyStream(', BUFFER, ');',
          '}');

        return result
      }

      attributeDefs[attribute] = createDynamicDecl(dyn, appendAttributeCode);
    });

    return attributeDefs
  }

  function parseContext (context) {
    var staticContext = context.static;
    var dynamicContext = context.dynamic;
    var result = {};

    Object.keys(staticContext).forEach(function (name) {
      var value = staticContext[name];
      result[name] = createStaticDecl(function (env, scope) {
        if (typeof value === 'number' || typeof value === 'boolean') {
          return '' + value
        } else {
          return env.link(value)
        }
      });
    });

    Object.keys(dynamicContext).forEach(function (name) {
      var dyn = dynamicContext[name];
      result[name] = createDynamicDecl(dyn, function (env, scope) {
        return env.invoke(scope, dyn)
      });
    });

    return result
  }

  function parseArguments (options, attributes, uniforms, context, env) {
    var staticOptions = options.static;
    var dynamicOptions = options.dynamic;

    check$1.optional(function () {
      var KEY_NAMES = [
        S_FRAMEBUFFER,
        S_VERT,
        S_FRAG,
        S_ELEMENTS,
        S_PRIMITIVE,
        S_OFFSET,
        S_COUNT,
        S_INSTANCES,
        S_PROFILE
      ].concat(GL_STATE_NAMES);

      function checkKeys (dict) {
        Object.keys(dict).forEach(function (key) {
          check$1.command(
            KEY_NAMES.indexOf(key) >= 0,
            'unknown parameter "' + key + '"',
            env.commandStr);
        });
      }

      checkKeys(staticOptions);
      checkKeys(dynamicOptions);
    });

    var framebuffer = parseFramebuffer(options, env);
    var viewportAndScissor = parseViewportScissor(options, framebuffer, env);
    var draw = parseDraw(options, env);
    var state = parseGLState(options, env);
    var shader = parseProgram(options, env);

    function copyBox (name) {
      var defn = viewportAndScissor[name];
      if (defn) {
        state[name] = defn;
      }
    }
    copyBox(S_VIEWPORT);
    copyBox(propName(S_SCISSOR_BOX));

    var dirty = Object.keys(state).length > 0;

    var result = {
      framebuffer: framebuffer,
      draw: draw,
      shader: shader,
      state: state,
      dirty: dirty
    };

    result.profile = parseProfile(options, env);
    result.uniforms = parseUniforms(uniforms, env);
    result.attributes = parseAttributes(attributes, env);
    result.context = parseContext(context, env);
    return result
  }

  // ===================================================
  // ===================================================
  // COMMON UPDATE FUNCTIONS
  // ===================================================
  // ===================================================
  function emitContext (env, scope, context) {
    var shared = env.shared;
    var CONTEXT = shared.context;

    var contextEnter = env.scope();

    Object.keys(context).forEach(function (name) {
      scope.save(CONTEXT, '.' + name);
      var defn = context[name];
      contextEnter(CONTEXT, '.', name, '=', defn.append(env, scope), ';');
    });

    scope(contextEnter);
  }

  // ===================================================
  // ===================================================
  // COMMON DRAWING FUNCTIONS
  // ===================================================
  // ===================================================
  function emitPollFramebuffer (env, scope, framebuffer, skipCheck) {
    var shared = env.shared;

    var GL = shared.gl;
    var FRAMEBUFFER_STATE = shared.framebuffer;
    var EXT_DRAW_BUFFERS;
    if (extDrawBuffers) {
      EXT_DRAW_BUFFERS = scope.def(shared.extensions, '.webgl_draw_buffers');
    }

    var constants = env.constants;

    var DRAW_BUFFERS = constants.drawBuffer;
    var BACK_BUFFER = constants.backBuffer;

    var NEXT;
    if (framebuffer) {
      NEXT = framebuffer.append(env, scope);
    } else {
      NEXT = scope.def(FRAMEBUFFER_STATE, '.next');
    }

    if (!skipCheck) {
      scope('if(', NEXT, '!==', FRAMEBUFFER_STATE, '.cur){');
    }
    scope(
      'if(', NEXT, '){',
      GL, '.bindFramebuffer(', GL_FRAMEBUFFER$1, ',', NEXT, '.framebuffer);');
    if (extDrawBuffers) {
      scope(EXT_DRAW_BUFFERS, '.drawBuffersWEBGL(',
        DRAW_BUFFERS, '[', NEXT, '.colorAttachments.length]);');
    }
    scope('}else{',
      GL, '.bindFramebuffer(', GL_FRAMEBUFFER$1, ',null);');
    if (extDrawBuffers) {
      scope(EXT_DRAW_BUFFERS, '.drawBuffersWEBGL(', BACK_BUFFER, ');');
    }
    scope(
      '}',
      FRAMEBUFFER_STATE, '.cur=', NEXT, ';');
    if (!skipCheck) {
      scope('}');
    }
  }

  function emitPollState (env, scope, args) {
    var shared = env.shared;

    var GL = shared.gl;

    var CURRENT_VARS = env.current;
    var NEXT_VARS = env.next;
    var CURRENT_STATE = shared.current;
    var NEXT_STATE = shared.next;

    var block = env.cond(CURRENT_STATE, '.dirty');

    GL_STATE_NAMES.forEach(function (prop) {
      var param = propName(prop);
      if (param in args.state) {
        return
      }

      var NEXT, CURRENT;
      if (param in NEXT_VARS) {
        NEXT = NEXT_VARS[param];
        CURRENT = CURRENT_VARS[param];
        var parts = loop(currentState[param].length, function (i) {
          return block.def(NEXT, '[', i, ']')
        });
        block(env.cond(parts.map(function (p, i) {
          return p + '!==' + CURRENT + '[' + i + ']'
        }).join('||'))
          .then(
            GL, '.', GL_VARIABLES[param], '(', parts, ');',
            parts.map(function (p, i) {
              return CURRENT + '[' + i + ']=' + p
            }).join(';'), ';'));
      } else {
        NEXT = block.def(NEXT_STATE, '.', param);
        var ifte = env.cond(NEXT, '!==', CURRENT_STATE, '.', param);
        block(ifte);
        if (param in GL_FLAGS) {
          ifte(
            env.cond(NEXT)
                .then(GL, '.enable(', GL_FLAGS[param], ');')
                .else(GL, '.disable(', GL_FLAGS[param], ');'),
            CURRENT_STATE, '.', param, '=', NEXT, ';');
        } else {
          ifte(
            GL, '.', GL_VARIABLES[param], '(', NEXT, ');',
            CURRENT_STATE, '.', param, '=', NEXT, ';');
        }
      }
    });
    if (Object.keys(args.state).length === 0) {
      block(CURRENT_STATE, '.dirty=false;');
    }
    scope(block);
  }

  function emitSetOptions (env, scope, options, filter) {
    var shared = env.shared;
    var CURRENT_VARS = env.current;
    var CURRENT_STATE = shared.current;
    var GL = shared.gl;
    sortState(Object.keys(options)).forEach(function (param) {
      var defn = options[param];
      if (filter && !filter(defn)) {
        return
      }
      var variable = defn.append(env, scope);
      if (GL_FLAGS[param]) {
        var flag = GL_FLAGS[param];
        if (isStatic(defn)) {
          if (variable) {
            scope(GL, '.enable(', flag, ');');
          } else {
            scope(GL, '.disable(', flag, ');');
          }
        } else {
          scope(env.cond(variable)
            .then(GL, '.enable(', flag, ');')
            .else(GL, '.disable(', flag, ');'));
        }
        scope(CURRENT_STATE, '.', param, '=', variable, ';');
      } else if (isArrayLike(variable)) {
        var CURRENT = CURRENT_VARS[param];
        scope(
          GL, '.', GL_VARIABLES[param], '(', variable, ');',
          variable.map(function (v, i) {
            return CURRENT + '[' + i + ']=' + v
          }).join(';'), ';');
      } else {
        scope(
          GL, '.', GL_VARIABLES[param], '(', variable, ');',
          CURRENT_STATE, '.', param, '=', variable, ';');
      }
    });
  }

  function injectExtensions (env, scope) {
    if (extInstancing) {
      env.instancing = scope.def(
        env.shared.extensions, '.angle_instanced_arrays');
    }
  }

  function emitProfile (env, scope, args, useScope, incrementCounter) {
    var shared = env.shared;
    var STATS = env.stats;
    var CURRENT_STATE = shared.current;
    var TIMER = shared.timer;
    var profileArg = args.profile;

    function perfCounter () {
      if (typeof performance === 'undefined') {
        return 'Date.now()'
      } else {
        return 'performance.now()'
      }
    }

    var CPU_START, QUERY_COUNTER;
    function emitProfileStart (block) {
      CPU_START = scope.def();
      block(CPU_START, '=', perfCounter(), ';');
      if (typeof incrementCounter === 'string') {
        block(STATS, '.count+=', incrementCounter, ';');
      } else {
        block(STATS, '.count++;');
      }
      if (timer) {
        if (useScope) {
          QUERY_COUNTER = scope.def();
          block(QUERY_COUNTER, '=', TIMER, '.getNumPendingQueries();');
        } else {
          block(TIMER, '.beginQuery(', STATS, ');');
        }
      }
    }

    function emitProfileEnd (block) {
      block(STATS, '.cpuTime+=', perfCounter(), '-', CPU_START, ';');
      if (timer) {
        if (useScope) {
          block(TIMER, '.pushScopeStats(',
            QUERY_COUNTER, ',',
            TIMER, '.getNumPendingQueries(),',
            STATS, ');');
        } else {
          block(TIMER, '.endQuery();');
        }
      }
    }

    function scopeProfile (value) {
      var prev = scope.def(CURRENT_STATE, '.profile');
      scope(CURRENT_STATE, '.profile=', value, ';');
      scope.exit(CURRENT_STATE, '.profile=', prev, ';');
    }

    var USE_PROFILE;
    if (profileArg) {
      if (isStatic(profileArg)) {
        if (profileArg.enable) {
          emitProfileStart(scope);
          emitProfileEnd(scope.exit);
          scopeProfile('true');
        } else {
          scopeProfile('false');
        }
        return
      }
      USE_PROFILE = profileArg.append(env, scope);
      scopeProfile(USE_PROFILE);
    } else {
      USE_PROFILE = scope.def(CURRENT_STATE, '.profile');
    }

    var start = env.block();
    emitProfileStart(start);
    scope('if(', USE_PROFILE, '){', start, '}');
    var end = env.block();
    emitProfileEnd(end);
    scope.exit('if(', USE_PROFILE, '){', end, '}');
  }

  function emitAttributes (env, scope, args, attributes, filter) {
    var shared = env.shared;

    function typeLength (x) {
      switch (x) {
        case GL_FLOAT_VEC2:
        case GL_INT_VEC2:
        case GL_BOOL_VEC2:
          return 2
        case GL_FLOAT_VEC3:
        case GL_INT_VEC3:
        case GL_BOOL_VEC3:
          return 3
        case GL_FLOAT_VEC4:
        case GL_INT_VEC4:
        case GL_BOOL_VEC4:
          return 4
        default:
          return 1
      }
    }

    function emitBindAttribute (ATTRIBUTE, size, record) {
      var GL = shared.gl;

      var LOCATION = scope.def(ATTRIBUTE, '.location');
      var BINDING = scope.def(shared.attributes, '[', LOCATION, ']');

      var STATE = record.state;
      var BUFFER = record.buffer;
      var CONST_COMPONENTS = [
        record.x,
        record.y,
        record.z,
        record.w
      ];

      var COMMON_KEYS = [
        'buffer',
        'normalized',
        'offset',
        'stride'
      ];

      function emitBuffer () {
        scope(
          'if(!', BINDING, '.buffer){',
          GL, '.enableVertexAttribArray(', LOCATION, ');}');

        var TYPE = record.type;
        var SIZE;
        if (!record.size) {
          SIZE = size;
        } else {
          SIZE = scope.def(record.size, '||', size);
        }

        scope('if(',
          BINDING, '.type!==', TYPE, '||',
          BINDING, '.size!==', SIZE, '||',
          COMMON_KEYS.map(function (key) {
            return BINDING + '.' + key + '!==' + record[key]
          }).join('||'),
          '){',
          GL, '.bindBuffer(', GL_ARRAY_BUFFER$1, ',', BUFFER, '.buffer);',
          GL, '.vertexAttribPointer(', [
            LOCATION,
            SIZE,
            TYPE,
            record.normalized,
            record.stride,
            record.offset
          ], ');',
          BINDING, '.type=', TYPE, ';',
          BINDING, '.size=', SIZE, ';',
          COMMON_KEYS.map(function (key) {
            return BINDING + '.' + key + '=' + record[key] + ';'
          }).join(''),
          '}');

        if (extInstancing) {
          var DIVISOR = record.divisor;
          scope(
            'if(', BINDING, '.divisor!==', DIVISOR, '){',
            env.instancing, '.vertexAttribDivisorANGLE(', [LOCATION, DIVISOR], ');',
            BINDING, '.divisor=', DIVISOR, ';}');
        }
      }

      function emitConstant () {
        scope(
          'if(', BINDING, '.buffer){',
          GL, '.disableVertexAttribArray(', LOCATION, ');',
          '}if(', CUTE_COMPONENTS.map(function (c, i) {
            return BINDING + '.' + c + '!==' + CONST_COMPONENTS[i]
          }).join('||'), '){',
          GL, '.vertexAttrib4f(', LOCATION, ',', CONST_COMPONENTS, ');',
          CUTE_COMPONENTS.map(function (c, i) {
            return BINDING + '.' + c + '=' + CONST_COMPONENTS[i] + ';'
          }).join(''),
          '}');
      }

      if (STATE === ATTRIB_STATE_POINTER) {
        emitBuffer();
      } else if (STATE === ATTRIB_STATE_CONSTANT) {
        emitConstant();
      } else {
        scope('if(', STATE, '===', ATTRIB_STATE_POINTER, '){');
        emitBuffer();
        scope('}else{');
        emitConstant();
        scope('}');
      }
    }

    attributes.forEach(function (attribute) {
      var name = attribute.name;
      var arg = args.attributes[name];
      var record;
      if (arg) {
        if (!filter(arg)) {
          return
        }
        record = arg.append(env, scope);
      } else {
        if (!filter(SCOPE_DECL)) {
          return
        }
        var scopeAttrib = env.scopeAttrib(name);
        check$1.optional(function () {
          env.assert(scope,
            scopeAttrib + '.state',
            'missing attribute ' + name);
        });
        record = {};
        Object.keys(new AttributeRecord()).forEach(function (key) {
          record[key] = scope.def(scopeAttrib, '.', key);
        });
      }
      emitBindAttribute(
        env.link(attribute), typeLength(attribute.info.type), record);
    });
  }

  function emitUniforms (env, scope, args, uniforms, filter) {
    var shared = env.shared;
    var GL = shared.gl;

    var infix;
    for (var i = 0; i < uniforms.length; ++i) {
      var uniform = uniforms[i];
      var name = uniform.name;
      var type = uniform.info.type;
      var arg = args.uniforms[name];
      var UNIFORM = env.link(uniform);
      var LOCATION = UNIFORM + '.location';

      var VALUE;
      if (arg) {
        if (!filter(arg)) {
          continue
        }
        if (isStatic(arg)) {
          var value = arg.value;
          check$1.command(
            value !== null && typeof value !== 'undefined',
            'missing uniform "' + name + '"', env.commandStr);
          if (type === GL_SAMPLER_2D || type === GL_SAMPLER_CUBE) {
            check$1.command(
              typeof value === 'function' &&
              ((type === GL_SAMPLER_2D &&
                (value._reglType === 'texture2d' ||
                value._reglType === 'framebuffer')) ||
              (type === GL_SAMPLER_CUBE &&
                (value._reglType === 'textureCube' ||
                value._reglType === 'framebufferCube'))),
              'invalid texture for uniform ' + name, env.commandStr);
            var TEX_VALUE = env.link(value._texture || value.color[0]._texture);
            scope(GL, '.uniform1i(', LOCATION, ',', TEX_VALUE + '.bind());');
            scope.exit(TEX_VALUE, '.unbind();');
          } else if (
            type === GL_FLOAT_MAT2 ||
            type === GL_FLOAT_MAT3 ||
            type === GL_FLOAT_MAT4) {
            check$1.optional(function () {
              check$1.command(isArrayLike(value),
                'invalid matrix for uniform ' + name, env.commandStr);
              check$1.command(
                (type === GL_FLOAT_MAT2 && value.length === 4) ||
                (type === GL_FLOAT_MAT3 && value.length === 9) ||
                (type === GL_FLOAT_MAT4 && value.length === 16),
                'invalid length for matrix uniform ' + name, env.commandStr);
            });
            var MAT_VALUE = env.global.def('new Float32Array([' +
              Array.prototype.slice.call(value) + '])');
            var dim = 2;
            if (type === GL_FLOAT_MAT3) {
              dim = 3;
            } else if (type === GL_FLOAT_MAT4) {
              dim = 4;
            }
            scope(
              GL, '.uniformMatrix', dim, 'fv(',
              LOCATION, ',false,', MAT_VALUE, ');');
          } else {
            switch (type) {
              case GL_FLOAT$7:
                check$1.commandType(value, 'number', 'uniform ' + name, env.commandStr);
                infix = '1f';
                break
              case GL_FLOAT_VEC2:
                check$1.command(
                  isArrayLike(value) && value.length === 2,
                  'uniform ' + name, env.commandStr);
                infix = '2f';
                break
              case GL_FLOAT_VEC3:
                check$1.command(
                  isArrayLike(value) && value.length === 3,
                  'uniform ' + name, env.commandStr);
                infix = '3f';
                break
              case GL_FLOAT_VEC4:
                check$1.command(
                  isArrayLike(value) && value.length === 4,
                  'uniform ' + name, env.commandStr);
                infix = '4f';
                break
              case GL_BOOL:
                check$1.commandType(value, 'boolean', 'uniform ' + name, env.commandStr);
                infix = '1i';
                break
              case GL_INT$3:
                check$1.commandType(value, 'number', 'uniform ' + name, env.commandStr);
                infix = '1i';
                break
              case GL_BOOL_VEC2:
                check$1.command(
                  isArrayLike(value) && value.length === 2,
                  'uniform ' + name, env.commandStr);
                infix = '2i';
                break
              case GL_INT_VEC2:
                check$1.command(
                  isArrayLike(value) && value.length === 2,
                  'uniform ' + name, env.commandStr);
                infix = '2i';
                break
              case GL_BOOL_VEC3:
                check$1.command(
                  isArrayLike(value) && value.length === 3,
                  'uniform ' + name, env.commandStr);
                infix = '3i';
                break
              case GL_INT_VEC3:
                check$1.command(
                  isArrayLike(value) && value.length === 3,
                  'uniform ' + name, env.commandStr);
                infix = '3i';
                break
              case GL_BOOL_VEC4:
                check$1.command(
                  isArrayLike(value) && value.length === 4,
                  'uniform ' + name, env.commandStr);
                infix = '4i';
                break
              case GL_INT_VEC4:
                check$1.command(
                  isArrayLike(value) && value.length === 4,
                  'uniform ' + name, env.commandStr);
                infix = '4i';
                break
            }
            scope(GL, '.uniform', infix, '(', LOCATION, ',',
              isArrayLike(value) ? Array.prototype.slice.call(value) : value,
              ');');
          }
          continue
        } else {
          VALUE = arg.append(env, scope);
        }
      } else {
        if (!filter(SCOPE_DECL)) {
          continue
        }
        VALUE = scope.def(shared.uniforms, '[', stringStore.id(name), ']');
      }

      if (type === GL_SAMPLER_2D) {
        scope(
          'if(', VALUE, '&&', VALUE, '._reglType==="framebuffer"){',
          VALUE, '=', VALUE, '.color[0];',
          '}');
      } else if (type === GL_SAMPLER_CUBE) {
        scope(
          'if(', VALUE, '&&', VALUE, '._reglType==="framebufferCube"){',
          VALUE, '=', VALUE, '.color[0];',
          '}');
      }

      // perform type validation
      check$1.optional(function () {
        function check (pred, message) {
          env.assert(scope, pred,
            'bad data or missing for uniform "' + name + '".  ' + message);
        }

        function checkType (type) {
          check(
            'typeof ' + VALUE + '==="' + type + '"',
            'invalid type, expected ' + type);
        }

        function checkVector (n, type) {
          check(
            shared.isArrayLike + '(' + VALUE + ')&&' + VALUE + '.length===' + n,
            'invalid vector, should have length ' + n, env.commandStr);
        }

        function checkTexture (target) {
          check(
            'typeof ' + VALUE + '==="function"&&' +
            VALUE + '._reglType==="texture' +
            (target === GL_TEXTURE_2D$2 ? '2d' : 'Cube') + '"',
            'invalid texture type', env.commandStr);
        }

        switch (type) {
          case GL_INT$3:
            checkType('number');
            break
          case GL_INT_VEC2:
            checkVector(2, 'number');
            break
          case GL_INT_VEC3:
            checkVector(3, 'number');
            break
          case GL_INT_VEC4:
            checkVector(4, 'number');
            break
          case GL_FLOAT$7:
            checkType('number');
            break
          case GL_FLOAT_VEC2:
            checkVector(2, 'number');
            break
          case GL_FLOAT_VEC3:
            checkVector(3, 'number');
            break
          case GL_FLOAT_VEC4:
            checkVector(4, 'number');
            break
          case GL_BOOL:
            checkType('boolean');
            break
          case GL_BOOL_VEC2:
            checkVector(2, 'boolean');
            break
          case GL_BOOL_VEC3:
            checkVector(3, 'boolean');
            break
          case GL_BOOL_VEC4:
            checkVector(4, 'boolean');
            break
          case GL_FLOAT_MAT2:
            checkVector(4, 'number');
            break
          case GL_FLOAT_MAT3:
            checkVector(9, 'number');
            break
          case GL_FLOAT_MAT4:
            checkVector(16, 'number');
            break
          case GL_SAMPLER_2D:
            checkTexture(GL_TEXTURE_2D$2);
            break
          case GL_SAMPLER_CUBE:
            checkTexture(GL_TEXTURE_CUBE_MAP$1);
            break
        }
      });

      var unroll = 1;
      switch (type) {
        case GL_SAMPLER_2D:
        case GL_SAMPLER_CUBE:
          var TEX = scope.def(VALUE, '._texture');
          scope(GL, '.uniform1i(', LOCATION, ',', TEX, '.bind());');
          scope.exit(TEX, '.unbind();');
          continue

        case GL_INT$3:
        case GL_BOOL:
          infix = '1i';
          break

        case GL_INT_VEC2:
        case GL_BOOL_VEC2:
          infix = '2i';
          unroll = 2;
          break

        case GL_INT_VEC3:
        case GL_BOOL_VEC3:
          infix = '3i';
          unroll = 3;
          break

        case GL_INT_VEC4:
        case GL_BOOL_VEC4:
          infix = '4i';
          unroll = 4;
          break

        case GL_FLOAT$7:
          infix = '1f';
          break

        case GL_FLOAT_VEC2:
          infix = '2f';
          unroll = 2;
          break

        case GL_FLOAT_VEC3:
          infix = '3f';
          unroll = 3;
          break

        case GL_FLOAT_VEC4:
          infix = '4f';
          unroll = 4;
          break

        case GL_FLOAT_MAT2:
          infix = 'Matrix2fv';
          break

        case GL_FLOAT_MAT3:
          infix = 'Matrix3fv';
          break

        case GL_FLOAT_MAT4:
          infix = 'Matrix4fv';
          break
      }

      scope(GL, '.uniform', infix, '(', LOCATION, ',');
      if (infix.charAt(0) === 'M') {
        var matSize = Math.pow(type - GL_FLOAT_MAT2 + 2, 2);
        var STORAGE = env.global.def('new Float32Array(', matSize, ')');
        scope(
          'false,(Array.isArray(', VALUE, ')||', VALUE, ' instanceof Float32Array)?', VALUE, ':(',
          loop(matSize, function (i) {
            return STORAGE + '[' + i + ']=' + VALUE + '[' + i + ']'
          }), ',', STORAGE, ')');
      } else if (unroll > 1) {
        scope(loop(unroll, function (i) {
          return VALUE + '[' + i + ']'
        }));
      } else {
        scope(VALUE);
      }
      scope(');');
    }
  }

  function emitDraw (env, outer, inner, args) {
    var shared = env.shared;
    var GL = shared.gl;
    var DRAW_STATE = shared.draw;

    var drawOptions = args.draw;

    function emitElements () {
      var defn = drawOptions.elements;
      var ELEMENTS;
      var scope = outer;
      if (defn) {
        if ((defn.contextDep && args.contextDynamic) || defn.propDep) {
          scope = inner;
        }
        ELEMENTS = defn.append(env, scope);
      } else {
        ELEMENTS = scope.def(DRAW_STATE, '.', S_ELEMENTS);
      }
      if (ELEMENTS) {
        scope(
          'if(' + ELEMENTS + ')' +
          GL + '.bindBuffer(' + GL_ELEMENT_ARRAY_BUFFER$1 + ',' + ELEMENTS + '.buffer.buffer);');
      }
      return ELEMENTS
    }

    function emitCount () {
      var defn = drawOptions.count;
      var COUNT;
      var scope = outer;
      if (defn) {
        if ((defn.contextDep && args.contextDynamic) || defn.propDep) {
          scope = inner;
        }
        COUNT = defn.append(env, scope);
        check$1.optional(function () {
          if (defn.MISSING) {
            env.assert(outer, 'false', 'missing vertex count');
          }
          if (defn.DYNAMIC) {
            env.assert(scope, COUNT + '>=0', 'missing vertex count');
          }
        });
      } else {
        COUNT = scope.def(DRAW_STATE, '.', S_COUNT);
        check$1.optional(function () {
          env.assert(scope, COUNT + '>=0', 'missing vertex count');
        });
      }
      return COUNT
    }

    var ELEMENTS = emitElements();
    function emitValue (name) {
      var defn = drawOptions[name];
      if (defn) {
        if ((defn.contextDep && args.contextDynamic) || defn.propDep) {
          return defn.append(env, inner)
        } else {
          return defn.append(env, outer)
        }
      } else {
        return outer.def(DRAW_STATE, '.', name)
      }
    }

    var PRIMITIVE = emitValue(S_PRIMITIVE);
    var OFFSET = emitValue(S_OFFSET);

    var COUNT = emitCount();
    if (typeof COUNT === 'number') {
      if (COUNT === 0) {
        return
      }
    } else {
      inner('if(', COUNT, '){');
      inner.exit('}');
    }

    var INSTANCES, EXT_INSTANCING;
    if (extInstancing) {
      INSTANCES = emitValue(S_INSTANCES);
      EXT_INSTANCING = env.instancing;
    }

    var ELEMENT_TYPE = ELEMENTS + '.type';

    var elementsStatic = drawOptions.elements && isStatic(drawOptions.elements);

    function emitInstancing () {
      function drawElements () {
        inner(EXT_INSTANCING, '.drawElementsInstancedANGLE(', [
          PRIMITIVE,
          COUNT,
          ELEMENT_TYPE,
          OFFSET + '<<((' + ELEMENT_TYPE + '-' + GL_UNSIGNED_BYTE$7 + ')>>1)',
          INSTANCES
        ], ');');
      }

      function drawArrays () {
        inner(EXT_INSTANCING, '.drawArraysInstancedANGLE(',
          [PRIMITIVE, OFFSET, COUNT, INSTANCES], ');');
      }

      if (ELEMENTS) {
        if (!elementsStatic) {
          inner('if(', ELEMENTS, '){');
          drawElements();
          inner('}else{');
          drawArrays();
          inner('}');
        } else {
          drawElements();
        }
      } else {
        drawArrays();
      }
    }

    function emitRegular () {
      function drawElements () {
        inner(GL + '.drawElements(' + [
          PRIMITIVE,
          COUNT,
          ELEMENT_TYPE,
          OFFSET + '<<((' + ELEMENT_TYPE + '-' + GL_UNSIGNED_BYTE$7 + ')>>1)'
        ] + ');');
      }

      function drawArrays () {
        inner(GL + '.drawArrays(' + [PRIMITIVE, OFFSET, COUNT] + ');');
      }

      if (ELEMENTS) {
        if (!elementsStatic) {
          inner('if(', ELEMENTS, '){');
          drawElements();
          inner('}else{');
          drawArrays();
          inner('}');
        } else {
          drawElements();
        }
      } else {
        drawArrays();
      }
    }

    if (extInstancing && (typeof INSTANCES !== 'number' || INSTANCES >= 0)) {
      if (typeof INSTANCES === 'string') {
        inner('if(', INSTANCES, '>0){');
        emitInstancing();
        inner('}else if(', INSTANCES, '<0){');
        emitRegular();
        inner('}');
      } else {
        emitInstancing();
      }
    } else {
      emitRegular();
    }
  }

  function createBody (emitBody, parentEnv, args, program, count) {
    var env = createREGLEnvironment();
    var scope = env.proc('body', count);
    check$1.optional(function () {
      env.commandStr = parentEnv.commandStr;
      env.command = env.link(parentEnv.commandStr);
    });
    if (extInstancing) {
      env.instancing = scope.def(
        env.shared.extensions, '.angle_instanced_arrays');
    }
    emitBody(env, scope, args, program);
    return env.compile().body
  }

  // ===================================================
  // ===================================================
  // DRAW PROC
  // ===================================================
  // ===================================================
  function emitDrawBody (env, draw, args, program) {
    injectExtensions(env, draw);
    emitAttributes(env, draw, args, program.attributes, function () {
      return true
    });
    emitUniforms(env, draw, args, program.uniforms, function () {
      return true
    });
    emitDraw(env, draw, draw, args);
  }

  function emitDrawProc (env, args) {
    var draw = env.proc('draw', 1);

    injectExtensions(env, draw);

    emitContext(env, draw, args.context);
    emitPollFramebuffer(env, draw, args.framebuffer);

    emitPollState(env, draw, args);
    emitSetOptions(env, draw, args.state);

    emitProfile(env, draw, args, false, true);

    var program = args.shader.progVar.append(env, draw);
    draw(env.shared.gl, '.useProgram(', program, '.program);');

    if (args.shader.program) {
      emitDrawBody(env, draw, args, args.shader.program);
    } else {
      var drawCache = env.global.def('{}');
      var PROG_ID = draw.def(program, '.id');
      var CACHED_PROC = draw.def(drawCache, '[', PROG_ID, ']');
      draw(
        env.cond(CACHED_PROC)
          .then(CACHED_PROC, '.call(this,a0);')
          .else(
            CACHED_PROC, '=', drawCache, '[', PROG_ID, ']=',
            env.link(function (program) {
              return createBody(emitDrawBody, env, args, program, 1)
            }), '(', program, ');',
            CACHED_PROC, '.call(this,a0);'));
    }

    if (Object.keys(args.state).length > 0) {
      draw(env.shared.current, '.dirty=true;');
    }
  }

  // ===================================================
  // ===================================================
  // BATCH PROC
  // ===================================================
  // ===================================================

  function emitBatchDynamicShaderBody (env, scope, args, program) {
    env.batchId = 'a1';

    injectExtensions(env, scope);

    function all () {
      return true
    }

    emitAttributes(env, scope, args, program.attributes, all);
    emitUniforms(env, scope, args, program.uniforms, all);
    emitDraw(env, scope, scope, args);
  }

  function emitBatchBody (env, scope, args, program) {
    injectExtensions(env, scope);

    var contextDynamic = args.contextDep;

    var BATCH_ID = scope.def();
    var PROP_LIST = 'a0';
    var NUM_PROPS = 'a1';
    var PROPS = scope.def();
    env.shared.props = PROPS;
    env.batchId = BATCH_ID;

    var outer = env.scope();
    var inner = env.scope();

    scope(
      outer.entry,
      'for(', BATCH_ID, '=0;', BATCH_ID, '<', NUM_PROPS, ';++', BATCH_ID, '){',
      PROPS, '=', PROP_LIST, '[', BATCH_ID, '];',
      inner,
      '}',
      outer.exit);

    function isInnerDefn (defn) {
      return ((defn.contextDep && contextDynamic) || defn.propDep)
    }

    function isOuterDefn (defn) {
      return !isInnerDefn(defn)
    }

    if (args.needsContext) {
      emitContext(env, inner, args.context);
    }
    if (args.needsFramebuffer) {
      emitPollFramebuffer(env, inner, args.framebuffer);
    }
    emitSetOptions(env, inner, args.state, isInnerDefn);

    if (args.profile && isInnerDefn(args.profile)) {
      emitProfile(env, inner, args, false, true);
    }

    if (!program) {
      var progCache = env.global.def('{}');
      var PROGRAM = args.shader.progVar.append(env, inner);
      var PROG_ID = inner.def(PROGRAM, '.id');
      var CACHED_PROC = inner.def(progCache, '[', PROG_ID, ']');
      inner(
        env.shared.gl, '.useProgram(', PROGRAM, '.program);',
        'if(!', CACHED_PROC, '){',
        CACHED_PROC, '=', progCache, '[', PROG_ID, ']=',
        env.link(function (program) {
          return createBody(
            emitBatchDynamicShaderBody, env, args, program, 2)
        }), '(', PROGRAM, ');}',
        CACHED_PROC, '.call(this,a0[', BATCH_ID, '],', BATCH_ID, ');');
    } else {
      emitAttributes(env, outer, args, program.attributes, isOuterDefn);
      emitAttributes(env, inner, args, program.attributes, isInnerDefn);
      emitUniforms(env, outer, args, program.uniforms, isOuterDefn);
      emitUniforms(env, inner, args, program.uniforms, isInnerDefn);
      emitDraw(env, outer, inner, args);
    }
  }

  function emitBatchProc (env, args) {
    var batch = env.proc('batch', 2);
    env.batchId = '0';

    injectExtensions(env, batch);

    // Check if any context variables depend on props
    var contextDynamic = false;
    var needsContext = true;
    Object.keys(args.context).forEach(function (name) {
      contextDynamic = contextDynamic || args.context[name].propDep;
    });
    if (!contextDynamic) {
      emitContext(env, batch, args.context);
      needsContext = false;
    }

    // framebuffer state affects framebufferWidth/height context vars
    var framebuffer = args.framebuffer;
    var needsFramebuffer = false;
    if (framebuffer) {
      if (framebuffer.propDep) {
        contextDynamic = needsFramebuffer = true;
      } else if (framebuffer.contextDep && contextDynamic) {
        needsFramebuffer = true;
      }
      if (!needsFramebuffer) {
        emitPollFramebuffer(env, batch, framebuffer);
      }
    } else {
      emitPollFramebuffer(env, batch, null);
    }

    // viewport is weird because it can affect context vars
    if (args.state.viewport && args.state.viewport.propDep) {
      contextDynamic = true;
    }

    function isInnerDefn (defn) {
      return (defn.contextDep && contextDynamic) || defn.propDep
    }

    // set webgl options
    emitPollState(env, batch, args);
    emitSetOptions(env, batch, args.state, function (defn) {
      return !isInnerDefn(defn)
    });

    if (!args.profile || !isInnerDefn(args.profile)) {
      emitProfile(env, batch, args, false, 'a1');
    }

    // Save these values to args so that the batch body routine can use them
    args.contextDep = contextDynamic;
    args.needsContext = needsContext;
    args.needsFramebuffer = needsFramebuffer;

    // determine if shader is dynamic
    var progDefn = args.shader.progVar;
    if ((progDefn.contextDep && contextDynamic) || progDefn.propDep) {
      emitBatchBody(
        env,
        batch,
        args,
        null);
    } else {
      var PROGRAM = progDefn.append(env, batch);
      batch(env.shared.gl, '.useProgram(', PROGRAM, '.program);');
      if (args.shader.program) {
        emitBatchBody(
          env,
          batch,
          args,
          args.shader.program);
      } else {
        var batchCache = env.global.def('{}');
        var PROG_ID = batch.def(PROGRAM, '.id');
        var CACHED_PROC = batch.def(batchCache, '[', PROG_ID, ']');
        batch(
          env.cond(CACHED_PROC)
            .then(CACHED_PROC, '.call(this,a0,a1);')
            .else(
              CACHED_PROC, '=', batchCache, '[', PROG_ID, ']=',
              env.link(function (program) {
                return createBody(emitBatchBody, env, args, program, 2)
              }), '(', PROGRAM, ');',
              CACHED_PROC, '.call(this,a0,a1);'));
      }
    }

    if (Object.keys(args.state).length > 0) {
      batch(env.shared.current, '.dirty=true;');
    }
  }

  // ===================================================
  // ===================================================
  // SCOPE COMMAND
  // ===================================================
  // ===================================================
  function emitScopeProc (env, args) {
    var scope = env.proc('scope', 3);
    env.batchId = 'a2';

    var shared = env.shared;
    var CURRENT_STATE = shared.current;

    emitContext(env, scope, args.context);

    if (args.framebuffer) {
      args.framebuffer.append(env, scope);
    }

    sortState(Object.keys(args.state)).forEach(function (name) {
      var defn = args.state[name];
      var value = defn.append(env, scope);
      if (isArrayLike(value)) {
        value.forEach(function (v, i) {
          scope.set(env.next[name], '[' + i + ']', v);
        });
      } else {
        scope.set(shared.next, '.' + name, value);
      }
    });

    emitProfile(env, scope, args, true, true)

    ;[S_ELEMENTS, S_OFFSET, S_COUNT, S_INSTANCES, S_PRIMITIVE].forEach(
      function (opt) {
        var variable = args.draw[opt];
        if (!variable) {
          return
        }
        scope.set(shared.draw, '.' + opt, '' + variable.append(env, scope));
      });

    Object.keys(args.uniforms).forEach(function (opt) {
      scope.set(
        shared.uniforms,
        '[' + stringStore.id(opt) + ']',
        args.uniforms[opt].append(env, scope));
    });

    Object.keys(args.attributes).forEach(function (name) {
      var record = args.attributes[name].append(env, scope);
      var scopeAttrib = env.scopeAttrib(name);
      Object.keys(new AttributeRecord()).forEach(function (prop) {
        scope.set(scopeAttrib, '.' + prop, record[prop]);
      });
    });

    function saveShader (name) {
      var shader = args.shader[name];
      if (shader) {
        scope.set(shared.shader, '.' + name, shader.append(env, scope));
      }
    }
    saveShader(S_VERT);
    saveShader(S_FRAG);

    if (Object.keys(args.state).length > 0) {
      scope(CURRENT_STATE, '.dirty=true;');
      scope.exit(CURRENT_STATE, '.dirty=true;');
    }

    scope('a1(', env.shared.context, ',a0,', env.batchId, ');');
  }

  function isDynamicObject (object) {
    if (typeof object !== 'object' || isArrayLike(object)) {
      return
    }
    var props = Object.keys(object);
    for (var i = 0; i < props.length; ++i) {
      if (dynamic.isDynamic(object[props[i]])) {
        return true
      }
    }
    return false
  }

  function splatObject (env, options, name) {
    var object = options.static[name];
    if (!object || !isDynamicObject(object)) {
      return
    }

    var globals = env.global;
    var keys = Object.keys(object);
    var thisDep = false;
    var contextDep = false;
    var propDep = false;
    var objectRef = env.global.def('{}');
    keys.forEach(function (key) {
      var value = object[key];
      if (dynamic.isDynamic(value)) {
        if (typeof value === 'function') {
          value = object[key] = dynamic.unbox(value);
        }
        var deps = createDynamicDecl(value, null);
        thisDep = thisDep || deps.thisDep;
        propDep = propDep || deps.propDep;
        contextDep = contextDep || deps.contextDep;
      } else {
        globals(objectRef, '.', key, '=');
        switch (typeof value) {
          case 'number':
            globals(value);
            break
          case 'string':
            globals('"', value, '"');
            break
          case 'object':
            if (Array.isArray(value)) {
              globals('[', value.join(), ']');
            }
            break
          default:
            globals(env.link(value));
            break
        }
        globals(';');
      }
    });

    function appendBlock (env, block) {
      keys.forEach(function (key) {
        var value = object[key];
        if (!dynamic.isDynamic(value)) {
          return
        }
        var ref = env.invoke(block, value);
        block(objectRef, '.', key, '=', ref, ';');
      });
    }

    options.dynamic[name] = new dynamic.DynamicVariable(DYN_THUNK, {
      thisDep: thisDep,
      contextDep: contextDep,
      propDep: propDep,
      ref: objectRef,
      append: appendBlock
    });
    delete options.static[name];
  }

  // ===========================================================================
  // ===========================================================================
  // MAIN DRAW COMMAND
  // ===========================================================================
  // ===========================================================================
  function compileCommand (options, attributes, uniforms, context, stats) {
    var env = createREGLEnvironment();

    // link stats, so that we can easily access it in the program.
    env.stats = env.link(stats);

    // splat options and attributes to allow for dynamic nested properties
    Object.keys(attributes.static).forEach(function (key) {
      splatObject(env, attributes, key);
    });
    NESTED_OPTIONS.forEach(function (name) {
      splatObject(env, options, name);
    });

    var args = parseArguments(options, attributes, uniforms, context, env);

    emitDrawProc(env, args);
    emitScopeProc(env, args);
    emitBatchProc(env, args);

    return env.compile()
  }

  // ===========================================================================
  // ===========================================================================
  // POLL / REFRESH
  // ===========================================================================
  // ===========================================================================
  return {
    next: nextState,
    current: currentState,
    procs: (function () {
      var env = createREGLEnvironment();
      var poll = env.proc('poll');
      var refresh = env.proc('refresh');
      var common = env.block();
      poll(common);
      refresh(common);

      var shared = env.shared;
      var GL = shared.gl;
      var NEXT_STATE = shared.next;
      var CURRENT_STATE = shared.current;

      common(CURRENT_STATE, '.dirty=false;');

      emitPollFramebuffer(env, poll);
      emitPollFramebuffer(env, refresh, null, true);

      // Refresh updates all attribute state changes
      var extInstancing = gl.getExtension('angle_instanced_arrays');
      var INSTANCING;
      if (extInstancing) {
        INSTANCING = env.link(extInstancing);
      }
      for (var i = 0; i < limits.maxAttributes; ++i) {
        var BINDING = refresh.def(shared.attributes, '[', i, ']');
        var ifte = env.cond(BINDING, '.buffer');
        ifte.then(
          GL, '.enableVertexAttribArray(', i, ');',
          GL, '.bindBuffer(',
            GL_ARRAY_BUFFER$1, ',',
            BINDING, '.buffer.buffer);',
          GL, '.vertexAttribPointer(',
            i, ',',
            BINDING, '.size,',
            BINDING, '.type,',
            BINDING, '.normalized,',
            BINDING, '.stride,',
            BINDING, '.offset);'
        ).else(
          GL, '.disableVertexAttribArray(', i, ');',
          GL, '.vertexAttrib4f(',
            i, ',',
            BINDING, '.x,',
            BINDING, '.y,',
            BINDING, '.z,',
            BINDING, '.w);',
          BINDING, '.buffer=null;');
        refresh(ifte);
        if (extInstancing) {
          refresh(
            INSTANCING, '.vertexAttribDivisorANGLE(',
            i, ',',
            BINDING, '.divisor);');
        }
      }

      Object.keys(GL_FLAGS).forEach(function (flag) {
        var cap = GL_FLAGS[flag];
        var NEXT = common.def(NEXT_STATE, '.', flag);
        var block = env.block();
        block('if(', NEXT, '){',
          GL, '.enable(', cap, ')}else{',
          GL, '.disable(', cap, ')}',
          CURRENT_STATE, '.', flag, '=', NEXT, ';');
        refresh(block);
        poll(
          'if(', NEXT, '!==', CURRENT_STATE, '.', flag, '){',
          block,
          '}');
      });

      Object.keys(GL_VARIABLES).forEach(function (name) {
        var func = GL_VARIABLES[name];
        var init = currentState[name];
        var NEXT, CURRENT;
        var block = env.block();
        block(GL, '.', func, '(');
        if (isArrayLike(init)) {
          var n = init.length;
          NEXT = env.global.def(NEXT_STATE, '.', name);
          CURRENT = env.global.def(CURRENT_STATE, '.', name);
          block(
            loop(n, function (i) {
              return NEXT + '[' + i + ']'
            }), ');',
            loop(n, function (i) {
              return CURRENT + '[' + i + ']=' + NEXT + '[' + i + '];'
            }).join(''));
          poll(
            'if(', loop(n, function (i) {
              return NEXT + '[' + i + ']!==' + CURRENT + '[' + i + ']'
            }).join('||'), '){',
            block,
            '}');
        } else {
          NEXT = common.def(NEXT_STATE, '.', name);
          CURRENT = common.def(CURRENT_STATE, '.', name);
          block(
            NEXT, ');',
            CURRENT_STATE, '.', name, '=', NEXT, ';');
          poll(
            'if(', NEXT, '!==', CURRENT, '){',
            block,
            '}');
        }
        refresh(block);
      });

      return env.compile()
    })(),
    compile: compileCommand
  }
}

function stats () {
  return {
    bufferCount: 0,
    elementsCount: 0,
    framebufferCount: 0,
    shaderCount: 0,
    textureCount: 0,
    cubeCount: 0,
    renderbufferCount: 0,

    maxTextureUnits: 0
  }
}

var GL_QUERY_RESULT_EXT = 0x8866;
var GL_QUERY_RESULT_AVAILABLE_EXT = 0x8867;
var GL_TIME_ELAPSED_EXT = 0x88BF;

var createTimer = function (gl, extensions) {
  var extTimer = extensions.ext_disjoint_timer_query;

  if (!extTimer) {
    return null
  }

  // QUERY POOL BEGIN
  var queryPool = [];
  function allocQuery () {
    return queryPool.pop() || extTimer.createQueryEXT()
  }
  function freeQuery (query) {
    queryPool.push(query);
  }
  // QUERY POOL END

  var pendingQueries = [];
  function beginQuery (stats) {
    var query = allocQuery();
    extTimer.beginQueryEXT(GL_TIME_ELAPSED_EXT, query);
    pendingQueries.push(query);
    pushScopeStats(pendingQueries.length - 1, pendingQueries.length, stats);
  }

  function endQuery () {
    extTimer.endQueryEXT(GL_TIME_ELAPSED_EXT);
  }

  //
  // Pending stats pool.
  //
  function PendingStats () {
    this.startQueryIndex = -1;
    this.endQueryIndex = -1;
    this.sum = 0;
    this.stats = null;
  }
  var pendingStatsPool = [];
  function allocPendingStats () {
    return pendingStatsPool.pop() || new PendingStats()
  }
  function freePendingStats (pendingStats) {
    pendingStatsPool.push(pendingStats);
  }
  // Pending stats pool end

  var pendingStats = [];
  function pushScopeStats (start, end, stats) {
    var ps = allocPendingStats();
    ps.startQueryIndex = start;
    ps.endQueryIndex = end;
    ps.sum = 0;
    ps.stats = stats;
    pendingStats.push(ps);
  }

  // we should call this at the beginning of the frame,
  // in order to update gpuTime
  var timeSum = [];
  var queryPtr = [];
  function update () {
    var ptr, i;

    var n = pendingQueries.length;
    if (n === 0) {
      return
    }

    // Reserve space
    queryPtr.length = Math.max(queryPtr.length, n + 1);
    timeSum.length = Math.max(timeSum.length, n + 1);
    timeSum[0] = 0;
    queryPtr[0] = 0;

    // Update all pending timer queries
    var queryTime = 0;
    ptr = 0;
    for (i = 0; i < pendingQueries.length; ++i) {
      var query = pendingQueries[i];
      if (extTimer.getQueryObjectEXT(query, GL_QUERY_RESULT_AVAILABLE_EXT)) {
        queryTime += extTimer.getQueryObjectEXT(query, GL_QUERY_RESULT_EXT);
        freeQuery(query);
      } else {
        pendingQueries[ptr++] = query;
      }
      timeSum[i + 1] = queryTime;
      queryPtr[i + 1] = ptr;
    }
    pendingQueries.length = ptr;

    // Update all pending stat queries
    ptr = 0;
    for (i = 0; i < pendingStats.length; ++i) {
      var stats = pendingStats[i];
      var start = stats.startQueryIndex;
      var end = stats.endQueryIndex;
      stats.sum += timeSum[end] - timeSum[start];
      var startPtr = queryPtr[start];
      var endPtr = queryPtr[end];
      if (endPtr === startPtr) {
        stats.stats.gpuTime += stats.sum / 1e6;
        freePendingStats(stats);
      } else {
        stats.startQueryIndex = startPtr;
        stats.endQueryIndex = endPtr;
        pendingStats[ptr++] = stats;
      }
    }
    pendingStats.length = ptr;
  }

  return {
    beginQuery: beginQuery,
    endQuery: endQuery,
    pushScopeStats: pushScopeStats,
    update: update,
    getNumPendingQueries: function () {
      return pendingQueries.length
    },
    clear: function () {
      queryPool.push.apply(queryPool, pendingQueries);
      for (var i = 0; i < queryPool.length; i++) {
        extTimer.deleteQueryEXT(queryPool[i]);
      }
      pendingQueries.length = 0;
      queryPool.length = 0;
    },
    restore: function () {
      pendingQueries.length = 0;
      queryPool.length = 0;
    }
  }
};

var GL_COLOR_BUFFER_BIT = 16384;
var GL_DEPTH_BUFFER_BIT = 256;
var GL_STENCIL_BUFFER_BIT = 1024;

var GL_ARRAY_BUFFER = 34962;

var CONTEXT_LOST_EVENT = 'webglcontextlost';
var CONTEXT_RESTORED_EVENT = 'webglcontextrestored';

var DYN_PROP = 1;
var DYN_CONTEXT = 2;
var DYN_STATE = 3;

function find (haystack, needle) {
  for (var i = 0; i < haystack.length; ++i) {
    if (haystack[i] === needle) {
      return i
    }
  }
  return -1
}

function wrapREGL (args) {
  var config = parseArgs(args);
  if (!config) {
    return null
  }

  var gl = config.gl;
  var glAttributes = gl.getContextAttributes();
  var contextLost = gl.isContextLost();

  var extensionState = createExtensionCache(gl, config);
  if (!extensionState) {
    return null
  }

  var stringStore = createStringStore();
  var stats$$1 = stats();
  var extensions = extensionState.extensions;
  var timer = createTimer(gl, extensions);

  var START_TIME = clock();
  var WIDTH = gl.drawingBufferWidth;
  var HEIGHT = gl.drawingBufferHeight;

  var contextState = {
    tick: 0,
    time: 0,
    viewportWidth: WIDTH,
    viewportHeight: HEIGHT,
    framebufferWidth: WIDTH,
    framebufferHeight: HEIGHT,
    drawingBufferWidth: WIDTH,
    drawingBufferHeight: HEIGHT,
    pixelRatio: config.pixelRatio
  };
  var uniformState = {};
  var drawState = {
    elements: null,
    primitive: 4, // GL_TRIANGLES
    count: -1,
    offset: 0,
    instances: -1
  };

  var limits = wrapLimits(gl, extensions);
  var bufferState = wrapBufferState(gl, stats$$1, config);
  var elementState = wrapElementsState(gl, extensions, bufferState, stats$$1);
  var attributeState = wrapAttributeState(
    gl,
    extensions,
    limits,
    bufferState,
    stringStore);
  var shaderState = wrapShaderState(gl, stringStore, stats$$1, config);
  var textureState = createTextureSet(
    gl,
    extensions,
    limits,
    function () { core.procs.poll(); },
    contextState,
    stats$$1,
    config);
  var renderbufferState = wrapRenderbuffers(gl, extensions, limits, stats$$1, config);
  var framebufferState = wrapFBOState(
    gl,
    extensions,
    limits,
    textureState,
    renderbufferState,
    stats$$1);
  var core = reglCore(
    gl,
    stringStore,
    extensions,
    limits,
    bufferState,
    elementState,
    textureState,
    framebufferState,
    uniformState,
    attributeState,
    shaderState,
    drawState,
    contextState,
    timer,
    config);
  var readPixels = wrapReadPixels(
    gl,
    framebufferState,
    core.procs.poll,
    contextState,
    glAttributes, extensions);

  var nextState = core.next;
  var canvas = gl.canvas;

  var rafCallbacks = [];
  var lossCallbacks = [];
  var restoreCallbacks = [];
  var destroyCallbacks = [config.onDestroy];

  var activeRAF = null;
  function handleRAF () {
    if (rafCallbacks.length === 0) {
      if (timer) {
        timer.update();
      }
      activeRAF = null;
      return
    }

    // schedule next animation frame
    activeRAF = raf.next(handleRAF);

    // poll for changes
    poll();

    // fire a callback for all pending rafs
    for (var i = rafCallbacks.length - 1; i >= 0; --i) {
      var cb = rafCallbacks[i];
      if (cb) {
        cb(contextState, null, 0);
      }
    }

    // flush all pending webgl calls
    gl.flush();

    // poll GPU timers *after* gl.flush so we don't delay command dispatch
    if (timer) {
      timer.update();
    }
  }

  function startRAF () {
    if (!activeRAF && rafCallbacks.length > 0) {
      activeRAF = raf.next(handleRAF);
    }
  }

  function stopRAF () {
    if (activeRAF) {
      raf.cancel(handleRAF);
      activeRAF = null;
    }
  }

  function handleContextLoss (event) {
    event.preventDefault();

    // set context lost flag
    contextLost = true;

    // pause request animation frame
    stopRAF();

    // lose context
    lossCallbacks.forEach(function (cb) {
      cb();
    });
  }

  function handleContextRestored (event) {
    // clear error code
    gl.getError();

    // clear context lost flag
    contextLost = false;

    // refresh state
    extensionState.restore();
    shaderState.restore();
    bufferState.restore();
    textureState.restore();
    renderbufferState.restore();
    framebufferState.restore();
    if (timer) {
      timer.restore();
    }

    // refresh state
    core.procs.refresh();

    // restart RAF
    startRAF();

    // restore context
    restoreCallbacks.forEach(function (cb) {
      cb();
    });
  }

  if (canvas) {
    canvas.addEventListener(CONTEXT_LOST_EVENT, handleContextLoss, false);
    canvas.addEventListener(CONTEXT_RESTORED_EVENT, handleContextRestored, false);
  }

  function destroy () {
    rafCallbacks.length = 0;
    stopRAF();

    if (canvas) {
      canvas.removeEventListener(CONTEXT_LOST_EVENT, handleContextLoss);
      canvas.removeEventListener(CONTEXT_RESTORED_EVENT, handleContextRestored);
    }

    shaderState.clear();
    framebufferState.clear();
    renderbufferState.clear();
    textureState.clear();
    elementState.clear();
    bufferState.clear();

    if (timer) {
      timer.clear();
    }

    destroyCallbacks.forEach(function (cb) {
      cb();
    });
  }

  function compileProcedure (options) {
    check$1(!!options, 'invalid args to regl({...})');
    check$1.type(options, 'object', 'invalid args to regl({...})');

    function flattenNestedOptions (options) {
      var result = extend({}, options);
      delete result.uniforms;
      delete result.attributes;
      delete result.context;

      if ('stencil' in result && result.stencil.op) {
        result.stencil.opBack = result.stencil.opFront = result.stencil.op;
        delete result.stencil.op;
      }

      function merge (name) {
        if (name in result) {
          var child = result[name];
          delete result[name];
          Object.keys(child).forEach(function (prop) {
            result[name + '.' + prop] = child[prop];
          });
        }
      }
      merge('blend');
      merge('depth');
      merge('cull');
      merge('stencil');
      merge('polygonOffset');
      merge('scissor');
      merge('sample');

      return result
    }

    function separateDynamic (object) {
      var staticItems = {};
      var dynamicItems = {};
      Object.keys(object).forEach(function (option) {
        var value = object[option];
        if (dynamic.isDynamic(value)) {
          dynamicItems[option] = dynamic.unbox(value, option);
        } else {
          staticItems[option] = value;
        }
      });
      return {
        dynamic: dynamicItems,
        static: staticItems
      }
    }

    // Treat context variables separate from other dynamic variables
    var context = separateDynamic(options.context || {});
    var uniforms = separateDynamic(options.uniforms || {});
    var attributes = separateDynamic(options.attributes || {});
    var opts = separateDynamic(flattenNestedOptions(options));

    var stats$$1 = {
      gpuTime: 0.0,
      cpuTime: 0.0,
      count: 0
    };

    var compiled = core.compile(opts, attributes, uniforms, context, stats$$1);

    var draw = compiled.draw;
    var batch = compiled.batch;
    var scope = compiled.scope;

    // FIXME: we should modify code generation for batch commands so this
    // isn't necessary
    var EMPTY_ARRAY = [];
    function reserve (count) {
      while (EMPTY_ARRAY.length < count) {
        EMPTY_ARRAY.push(null);
      }
      return EMPTY_ARRAY
    }

    function REGLCommand (args, body) {
      var i;
      if (contextLost) {
        check$1.raise('context lost');
      }
      if (typeof args === 'function') {
        return scope.call(this, null, args, 0)
      } else if (typeof body === 'function') {
        if (typeof args === 'number') {
          for (i = 0; i < args; ++i) {
            scope.call(this, null, body, i);
          }
          return
        } else if (Array.isArray(args)) {
          for (i = 0; i < args.length; ++i) {
            scope.call(this, args[i], body, i);
          }
          return
        } else {
          return scope.call(this, args, body, 0)
        }
      } else if (typeof args === 'number') {
        if (args > 0) {
          return batch.call(this, reserve(args | 0), args | 0)
        }
      } else if (Array.isArray(args)) {
        if (args.length) {
          return batch.call(this, args, args.length)
        }
      } else {
        return draw.call(this, args)
      }
    }

    return extend(REGLCommand, {
      stats: stats$$1
    })
  }

  var setFBO = framebufferState.setFBO = compileProcedure({
    framebuffer: dynamic.define.call(null, DYN_PROP, 'framebuffer')
  });

  function clearImpl (_, options) {
    var clearFlags = 0;
    core.procs.poll();

    var c = options.color;
    if (c) {
      gl.clearColor(+c[0] || 0, +c[1] || 0, +c[2] || 0, +c[3] || 0);
      clearFlags |= GL_COLOR_BUFFER_BIT;
    }
    if ('depth' in options) {
      gl.clearDepth(+options.depth);
      clearFlags |= GL_DEPTH_BUFFER_BIT;
    }
    if ('stencil' in options) {
      gl.clearStencil(options.stencil | 0);
      clearFlags |= GL_STENCIL_BUFFER_BIT;
    }

    check$1(!!clearFlags, 'called regl.clear with no buffer specified');
    gl.clear(clearFlags);
  }

  function clear (options) {
    check$1(
      typeof options === 'object' && options,
      'regl.clear() takes an object as input');
    if ('framebuffer' in options) {
      if (options.framebuffer &&
          options.framebuffer_reglType === 'framebufferCube') {
        for (var i = 0; i < 6; ++i) {
          setFBO(extend({
            framebuffer: options.framebuffer.faces[i]
          }, options), clearImpl);
        }
      } else {
        setFBO(options, clearImpl);
      }
    } else {
      clearImpl(null, options);
    }
  }

  function frame (cb) {
    check$1.type(cb, 'function', 'regl.frame() callback must be a function');
    rafCallbacks.push(cb);

    function cancel () {
      // FIXME:  should we check something other than equals cb here?
      // what if a user calls frame twice with the same callback...
      //
      var i = find(rafCallbacks, cb);
      check$1(i >= 0, 'cannot cancel a frame twice');
      function pendingCancel () {
        var index = find(rafCallbacks, pendingCancel);
        rafCallbacks[index] = rafCallbacks[rafCallbacks.length - 1];
        rafCallbacks.length -= 1;
        if (rafCallbacks.length <= 0) {
          stopRAF();
        }
      }
      rafCallbacks[i] = pendingCancel;
    }

    startRAF();

    return {
      cancel: cancel
    }
  }

  // poll viewport
  function pollViewport () {
    var viewport = nextState.viewport;
    var scissorBox = nextState.scissor_box;
    viewport[0] = viewport[1] = scissorBox[0] = scissorBox[1] = 0;
    contextState.viewportWidth =
      contextState.framebufferWidth =
      contextState.drawingBufferWidth =
      viewport[2] =
      scissorBox[2] = gl.drawingBufferWidth;
    contextState.viewportHeight =
      contextState.framebufferHeight =
      contextState.drawingBufferHeight =
      viewport[3] =
      scissorBox[3] = gl.drawingBufferHeight;
  }

  function poll () {
    contextState.tick += 1;
    contextState.time = now();
    pollViewport();
    core.procs.poll();
  }

  function refresh () {
    pollViewport();
    core.procs.refresh();
    if (timer) {
      timer.update();
    }
  }

  function now () {
    return (clock() - START_TIME) / 1000.0
  }

  refresh();

  function addListener (event, callback) {
    check$1.type(callback, 'function', 'listener callback must be a function');

    var callbacks;
    switch (event) {
      case 'frame':
        return frame(callback)
      case 'lost':
        callbacks = lossCallbacks;
        break
      case 'restore':
        callbacks = restoreCallbacks;
        break
      case 'destroy':
        callbacks = destroyCallbacks;
        break
      default:
        check$1.raise('invalid event, must be one of frame,lost,restore,destroy');
    }

    callbacks.push(callback);
    return {
      cancel: function () {
        for (var i = 0; i < callbacks.length; ++i) {
          if (callbacks[i] === callback) {
            callbacks[i] = callbacks[callbacks.length - 1];
            callbacks.pop();
            return
          }
        }
      }
    }
  }

  var regl = extend(compileProcedure, {
    // Clear current FBO
    clear: clear,

    // Short cuts for dynamic variables
    prop: dynamic.define.bind(null, DYN_PROP),
    context: dynamic.define.bind(null, DYN_CONTEXT),
    this: dynamic.define.bind(null, DYN_STATE),

    // executes an empty draw command
    draw: compileProcedure({}),

    // Resources
    buffer: function (options) {
      return bufferState.create(options, GL_ARRAY_BUFFER, false, false)
    },
    elements: function (options) {
      return elementState.create(options, false)
    },
    texture: textureState.create2D,
    cube: textureState.createCube,
    renderbuffer: renderbufferState.create,
    framebuffer: framebufferState.create,
    framebufferCube: framebufferState.createCube,

    // Expose context attributes
    attributes: glAttributes,

    // Frame rendering
    frame: frame,
    on: addListener,

    // System limits
    limits: limits,
    hasExtension: function (name) {
      return limits.extensions.indexOf(name.toLowerCase()) >= 0
    },

    // Read pixels
    read: readPixels,

    // Destroy regl and all associated resources
    destroy: destroy,

    // Direct GL state manipulation
    _gl: gl,
    _refresh: refresh,

    poll: function () {
      poll();
      if (timer) {
        timer.update();
      }
    },

    // Current time
    now: now,

    // regl Statistics Information
    stats: stats$$1
  });

  config.onDone(null, regl);

  return regl
}

return wrapREGL;

})));


},{}]},{},[1]);

preview.png

thumbnail.png