Japan Prefecture Population Change Since WW2

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ec(36e5*(Math.floor(n/36e5-t)+t))},function(n,t){n.setTime(n.getTime()+36e5*Math.floor(t))},function(n){return n.getHours()}),tc.hours=tc.hour.range,tc.hours.utc=tc.hour.utc.range,tc.month=Rt(function(n){return n=tc.day(n),n.setDate(1),n},function(n,t){n.setMonth(n.getMonth()+t)},function(n){return n.getMonth()}),tc.months=tc.month.range,tc.months.utc=tc.month.utc.range;var js=[1e3,5e3,15e3,3e4,6e4,3e5,9e5,18e5,36e5,108e5,216e5,432e5,864e5,1728e5,6048e5,2592e6,7776e6,31536e6],Hs=[[tc.second,1],[tc.second,5],[tc.second,15],[tc.second,30],[tc.minute,1],[tc.minute,5],[tc.minute,15],[tc.minute,30],[tc.hour,1],[tc.hour,3],[tc.hour,6],[tc.hour,12],[tc.day,1],[tc.day,2],[tc.week,1],[tc.month,1],[tc.month,3],[tc.year,1]],Fs=Ds.multi([[".%L",function(n){return n.getMilliseconds()}],[":%S",function(n){return n.getSeconds()}],["%I:%M",function(n){return n.getMinutes()}],["%I %p",function(n){return n.getHours()}],["%a %d",function(n){return n.getDay()&&1!=n.getDate()}],["%b %d",function(n){return 1!=n.getDate()}],["%B",function(n){return n.getMonth()}],["%Y",be]]),Os={range:function(n,t,e){return Xo.range(+n,+t,e).map(Io)},floor:bt,ceil:bt};Hs.year=tc.year,tc.scale=function(){return Yo(Xo.scale.linear(),Hs,Fs)};var Ys=Hs.map(function(n){return[n[0].utc,n[1]]}),Is=Ps.multi([[".%L",function(n){return n.getUTCMilliseconds()}],[":%S",function(n){return n.getUTCSeconds()}],["%I:%M",function(n){return n.getUTCMinutes()}],["%I %p",function(n){return n.getUTCHours()}],["%a %d",function(n){return n.getUTCDay()&&1!=n.getUTCDate()}],["%b %d",function(n){return 1!=n.getUTCDate()}],["%B",function(n){return n.getUTCMonth()}],["%Y",be]]);Ys.year=tc.year.utc,tc.scale.utc=function(){return Yo(Xo.scale.linear(),Ys,Is)},Xo.text=wt(function(n){return n.responseText}),Xo.json=function(n,t){return St(n,"application/json",Zo,t)},Xo.html=function(n,t){return St(n,"text/html",Vo,t)},Xo.xml=wt(function(n){return n.responseXML}),"function"==typeof define&&define.amd?define(Xo):"object"==typeof module&&module.exports?module.exports=Xo:this.d3=Xo}();

d3.slider.css

.d3-slider {
    position: relative;
    font-family: Verdana,Arial,sans-serif;
    font-size: 9;
    border: 0.5px solid #827878;
    z-index: 2;
    fill: black;
}

.d3-slider-horizontal {
    height: .8em;
}  

.d3-slider-range {
  background:#2980b9;
  left:50px;
  right:50px;
  height: 0.8em;
  position: absolute;
}

.d3-slider-range-vertical {
  background:#2980b9;
  left:50px;
  right:-50px;
  position: absolute;
  top:0;
}

.d3-slider-vertical {
    width: .8em;
    height: 100px;
}      

.d3-slider-handle {
    position: absolute;
    width: 1.2em;
    height: 1.2em;
    border: 1px solid #edbbbb;
    border-radius: 4px;
    background: red;
    background: linear-gradient(to bottom, #edbbbb 0%, #ffffff 100%);
    z-index: 3;
}

.d3-slider-handle:hover {
    border: 1px solid #999999;
}

.d3-slider-horizontal .d3-slider-handle {
    top: -.3em;
    margin-left: -.6em;
}

.d3-slider-axis {
    position: relative;
    z-index: 1;    
}

.d3-slider-axis-bottom {
    top: .8em;
}

.d3-slider-axis-right {
    left: .8em;
}

.d3-slider-axis path {
    stroke-width: 0;
    fill: none;
}

.d3-slider-axis line {
    fill: none;
    stroke: #aaa;
    shape-rendering: crispEdges;
}

.d3-slider-axis text {
    font-size: 11px;
}

.d3-slider-vertical .d3-slider-handle {
    left: -.25em;
    margin-left: 0;
    margin-bottom: -.6em;      
}

d3.slider.js

/*
    D3.js Slider
    Inspired by jQuery UI Slider
    Copyright (c) 2013, Bjorn Sandvik - http://blog.thematicmapping.org
    BSD license: http://opensource.org/licenses/BSD-3-Clause
*/
(function (root, factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD. Register as an anonymous module.
    define(['d3'], factory);
  } else if (typeof exports === 'object') {
    if (process.browser) {
      // Browserify. Import css too using cssify.
      require('./d3.slider.css');
    }
    // Node. Does not work with strict CommonJS, but
    // only CommonJS-like environments that support module.exports,
    // like Node.
    module.exports = factory(require('d3'));
  } else {
    // Browser globals (root is window)
    root.d3.slider = factory(root.d3);
  }
}(this, function (d3) {
return function module() {
  "use strict";

  // Public variables width default settings
  var min = 0,
      max = 100,
      step = 0.01,
      animate = true,
      orientation = "horizontal",
      axis = false,
      margin = 50,
      value,
      active = 1,
      snap = false,
      scale;

  // Private variables
  var axisScale,
      dispatch = d3.dispatch("slide", "slideend"),
      formatPercent = d3.format(".2%"),
      tickFormat = d3.format(".0"),
      handle1,
      handle2 = null,
      divRange,
      sliderLength;

  function slider(selection) {
    selection.each(function() {

      // Create scale if not defined by user
      if (!scale) {
        scale = d3.scale.linear().domain([min, max]);
      }

      // Start value
      value = value || scale.domain()[0];

      // DIV container
      var div = d3.select(this).classed("d3-slider d3-slider-" + orientation, true);
      
      var drag = d3.behavior.drag();
      drag.on('dragend', function () {
        dispatch.slideend(d3.event, value);
      })

      // Slider handle
      //if range slider, create two
      // var divRange;

      if (toType(value) == "array" && value.length == 2) {
        handle1 = div.append("a")
          .classed("d3-slider-handle", true)
          .attr("xlink:href", "#")
          .attr('id', "handle-one")
          .on("click", stopPropagation)
          .call(drag);
        handle2 = div.append("a")
          .classed("d3-slider-handle", true)
          .attr('id', "handle-two")
          .attr("xlink:href", "#")
          .on("click", stopPropagation)
          .call(drag);
      } else {
        handle1 = div.append("a")
          .classed("d3-slider-handle", true)
          .attr("xlink:href", "#")
          .attr('id', "handle-one")
          .on("click", stopPropagation)
          .call(drag);
      }
      
      // Horizontal slider
      if (orientation === "horizontal") {

        div.on("click", onClickHorizontal);
        
        if (toType(value) == "array" && value.length == 2) {
          divRange = d3.select(this).append('div').classed("d3-slider-range", true);

          handle1.style("left", formatPercent(scale(value[ 0 ])));
          divRange.style("left", formatPercent(scale(value[ 0 ])));
          drag.on("drag", onDragHorizontal);

          var width = 100 - parseFloat(formatPercent(scale(value[ 1 ])));
          handle2.style("left", formatPercent(scale(value[ 1 ])));
          divRange.style("right", width+"%");
          drag.on("drag", onDragHorizontal);

        } else {
          handle1.style("left", formatPercent(scale(value)));
          drag.on("drag", onDragHorizontal);
        }
        
        sliderLength = parseInt(div.style("width"), 10);

      } else { // Vertical

        div.on("click", onClickVertical);
        drag.on("drag", onDragVertical);
        if (toType(value) == "array" && value.length == 2) {
          divRange = d3.select(this).append('div').classed("d3-slider-range-vertical", true);

          handle1.style("bottom", formatPercent(scale(value[ 0 ])));
          divRange.style("bottom", formatPercent(scale(value[ 0 ])));
          drag.on("drag", onDragVertical);

          var top = 100 - parseFloat(formatPercent(scale(value[ 1 ])));
          handle2.style("bottom", formatPercent(scale(value[ 1 ])));
          divRange.style("top", top+"%");
          drag.on("drag", onDragVertical);

        } else {
          handle1.style("bottom", formatPercent(scale(value)));
          drag.on("drag", onDragVertical);
        }
        
        sliderLength = parseInt(div.style("height"), 10);

      }
      
      if (axis) {
        createAxis(div);
      }


      function createAxis(dom) {

        // Create axis if not defined by user
        if (typeof axis === "boolean") {

          axis = d3.svg.axis()
              .ticks(Math.round(sliderLength / 100))
              .tickFormat(tickFormat)
              .orient((orientation === "horizontal") ? "bottom" :  "right");

        }

        // Copy slider scale to move from percentages to pixels
        axisScale = scale.ticks ? scale.copy().range([0, sliderLength]) : scale.copy().rangePoints([0, sliderLength], 0.5);
          axis.scale(axisScale);

          // Create SVG axis container
        var svg = dom.append("svg")
            .classed("d3-slider-axis d3-slider-axis-" + axis.orient(), true)
            .on("click", stopPropagation);

        var g = svg.append("g");

        // Horizontal axis
        if (orientation === "horizontal") {

          svg.style("margin-left", -margin + "px");

          svg.attr({
            width: sliderLength + margin * 2,
            height: margin
          });

          if (axis.orient() === "top") {
            svg.style("top", -margin + "px");
            g.attr("transform", "translate(" + margin + "," + margin + ")");
          } else { // bottom
            g.attr("transform", "translate(" + margin + ",0)");
          }

        } else { // Vertical

          svg.style("top", -margin + "px");

          svg.attr({
            width: margin,
            height: sliderLength + margin * 2
          });

          if (axis.orient() === "left") {
            svg.style("left", -margin + "px");
            g.attr("transform", "translate(" + margin + "," + margin + ")");
          } else { // right          
            g.attr("transform", "translate(" + 0 + "," + margin + ")");
          }

        }

        g.call(axis);

      }

      function onClickHorizontal() {
        if (toType(value) != "array") {
          var pos = Math.max(0, Math.min(sliderLength, d3.event.offsetX || d3.event.layerX));
          moveHandle(scale.invert ? 
                      stepValue(scale.invert(pos / sliderLength))
                    : nearestTick(pos / sliderLength));
        }
      }

      function onClickVertical() {
        if (toType(value) != "array") {
          var pos = sliderLength - Math.max(0, Math.min(sliderLength, d3.event.offsetY || d3.event.layerY));
          moveHandle(scale.invert ? 
                      stepValue(scale.invert(pos / sliderLength))
                    : nearestTick(pos / sliderLength));
        }
      }

      function onDragHorizontal() {
        if ( d3.event.sourceEvent.target.id === "handle-one") {
          active = 1;
        } else if ( d3.event.sourceEvent.target.id == "handle-two" ) {
          active = 2;
        }
        var pos = Math.max(0, Math.min(sliderLength, d3.event.x));
        moveHandle(scale.invert ? 
                    stepValue(scale.invert(pos / sliderLength))
                  : nearestTick(pos / sliderLength));
      }

      function onDragVertical() {
        if ( d3.event.sourceEvent.target.id === "handle-one") {
          active = 1;
        } else if ( d3.event.sourceEvent.target.id == "handle-two" ) {
          active = 2;
        }
        var pos = sliderLength - Math.max(0, Math.min(sliderLength, d3.event.y))
        moveHandle(scale.invert ? 
                    stepValue(scale.invert(pos / sliderLength))
                  : nearestTick(pos / sliderLength));
      }

      function stopPropagation() {
        d3.event.stopPropagation();
      }

    });

  }

  // Move slider handle on click/drag
  function moveHandle(newValue) {
    var currentValue = toType(value) == "array"  && value.length == 2 ? value[active - 1]: value,
        oldPos = formatPercent(scale(stepValue(currentValue))),
        newPos = formatPercent(scale(stepValue(newValue))),
        position = (orientation === "horizontal") ? "left" : "bottom";
    if (oldPos !== newPos) {

      if (toType(value) == "array" && value.length == 2) {
        value[ active - 1 ] = newValue;
        if (d3.event) {
          dispatch.slide(d3.event, value );
        };
      } else {
        if (d3.event) {
          dispatch.slide(d3.event.sourceEvent || d3.event, value = newValue);
        };
      }

      if ( value[ 0 ] >= value[ 1 ] ) return;
      if ( active === 1 ) {
        if (toType(value) == "array" && value.length == 2) {
          (position === "left") ? divRange.style("left", newPos) : divRange.style("bottom", newPos);
        }

        if (animate) {
          handle1.transition()
              .styleTween(position, function() { return d3.interpolate(oldPos, newPos); })
              .duration((typeof animate === "number") ? animate : 250);
        } else {
          handle1.style(position, newPos);
        }
      } else {
        
        var width = 100 - parseFloat(newPos);
        var top = 100 - parseFloat(newPos);

        (position === "left") ? divRange.style("right", width + "%") : divRange.style("top", top + "%");
        
        if (animate) {
          handle2.transition()
              .styleTween(position, function() { return d3.interpolate(oldPos, newPos); })
              .duration((typeof animate === "number") ? animate : 250);
        } else {
          handle2.style(position, newPos);
        }
      }
    }
  }

  // Calculate nearest step value
  function stepValue(val) {

    if (val === scale.domain()[0] || val === scale.domain()[1]) {
      return val;
    }

    var alignValue = val;
    if (snap) {
      alignValue = nearestTick(scale(val));
    } else{
      var valModStep = (val - scale.domain()[0]) % step;
      alignValue = val - valModStep;

      if (Math.abs(valModStep) * 2 >= step) {
        alignValue += (valModStep > 0) ? step : -step;
      }
    };

    return alignValue;

  }

  // Find the nearest tick
  function nearestTick(pos) {
    var ticks = scale.ticks ? scale.ticks() : scale.domain();
    var dist = ticks.map(function(d) {return pos - scale(d);});
    var i = -1,
        index = 0,
        r = scale.ticks ? scale.range()[1] : scale.rangeExtent()[1];
    do {
        i++;
        if (Math.abs(dist[i]) < r) {
          r = Math.abs(dist[i]);
          index = i;
        };
    } while (dist[i] > 0 && i < dist.length - 1);

    return ticks[index];
  };

  // Return the type of an object
  function toType(v) {
    return ({}).toString.call(v).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
  };

  // Getter/setter functions
  slider.min = function(_) {
    if (!arguments.length) return min;
    min = _;
    return slider;
  };

  slider.max = function(_) {
    if (!arguments.length) return max;
    max = _;
    return slider;
  };

  slider.step = function(_) {
    if (!arguments.length) return step;
    step = _;
    return slider;
  };

  slider.animate = function(_) {
    if (!arguments.length) return animate;
    animate = _;
    return slider;
  };

  slider.orientation = function(_) {
    if (!arguments.length) return orientation;
    orientation = _;
    return slider;
  };

  slider.axis = function(_) {
    if (!arguments.length) return axis;
    axis = _;
    return slider;
  };

  slider.margin = function(_) {
    if (!arguments.length) return margin;
    margin = _;
    return slider;
  };

  slider.value = function(_) {
    if (!arguments.length) return value;
    if (value) {
      moveHandle(stepValue(_));
    };
    value = _;
    return slider;
  };

  slider.snap = function(_) {
    if (!arguments.length) return snap;
    snap = _;
    return slider;
  };

  slider.scale = function(_) {
    if (!arguments.length) return scale;
    scale = _;
    return slider;
  };

  d3.rebind(slider, dispatch, "on");

  return slider;

}
}));

index.html

<!DOCTYPE html>
  <head>
    <meta charset="UTF-8">
    <script src="d3.min.js"></script>
    <script src="topojson.js"></script>
    <script src="d3.slider.js"></script>
    <link rel="stylesheet" type="text/css" href="d3.slider.css">
    <title>Japanese Regional Population Change After WW2 (5 Years Interval)</title>
    <style>
      
      #tooltip {
        position: absolute;
        top: 0;
        left: 0;
        background-color: lightsteelblue;
        text-align: center;
        padding: 5px;
      }

      .wrapper{
        max-width: 90%;
        margin: 0 auto;
      }

      body {
        font-family: Helvetica, Arial, sans-serif;
        background-color: #eee;
      }

      #maintext {
        width: 1000px;
        margin: 25px auto 25px auto;
        padding: 50px 50px 50px 50px;
        background-color: white;
        box-shadow: 0 0 20px #ccc;
      }

      h1 {
        margin-bottom: 25px;
        font-size: 24px;
        font-weight: bold;
      }

      h4 {
        margin-top: 30px;
        margin-left: 20px;
        font-size: 14px;
      }

      p {
        margin-bottom: 25px;
        font-size: 13px;
        line-height: 18px;
      }


    </style>
  </head>
  <body>

    <div id="maintext">

      <h1>Japanese Regional Population Change After WW2 (5 Years Interval)</h1>
      <h4>Unit: Thousands people</h4>
      
      <p>The graph shows the trend of Japanese population growth since WW2. As the reader moves the slider towards present days. It shows the population growth is moving into negative territory in most areas, except Tokyo and Osaka region. Also it shows a huge growth in some regions right after the war, and the urbanization of Tokyo since the end of war. For more information, please refer to README.md file.<p>


    <div class="wrapper">
      <div class="container"></div>
      <div class="slider"></div>
    </div>

    <script type="text/javascript">

    var japan;
    var keys; // variable for different key(prefecture)
    var currentKey; // variable for current selection key (year)
    var sliderKeys = []; // year variable for sliders 
    var w = 960;
    var h = 760;
    
    // Setup canvas/container
    var container = d3.select('.container');
    var svg = container.append('svg')
        .attr('width', w)
        .attr('height', h)
        .append("g");

    var g = svg.append("g");

    // Assign color to domain range
    var color = d3.scale.linear()
        .domain([-150, 0, 500, 1000, 1800])
        .range(['#feebe2', '#fbb4b9', '#f768a1', '#c51b8a', '#7a0177']);

    // Tooltip style
    var tooltip = d3.select("body")
                    .append("div")
                    .attr("id", "tooltip")
                    .style("opacity", 0);

    // Update map color function
    var updateMap = function() {
      g.selectAll('path')
        .transition()
        .duration(1000)
        .style('fill', function(d) {
          return color(d.properties[currentKey]);
        });
    }

    // Legend color
    svg.selectAll('rect.legend')
      .data(color.domain())
      .enter()
      .append('rect')
      .attr('class', 'legend')
      .attr('x', 65)
      .attr('y', function(d, i) { return 100 + 20 * i; })
      .attr('width', 20)
      .attr('height', 20)
      .attr('fill', function(d) { return color(d); });
    
    // Legend text
    svg.selectAll('text.legend')
      .data(color.domain())
      .enter()
      .append('text')
      .attr('x', 60)
      .attr('y', function(d, i) { return 100 + 20 * i + 12; })
      .attr('font-size', 9)
      .attr('text-anchor', 'end')
      .text(function(d) { return d; });

    // Read map file
    d3.json('japan.topojson', function(error, collection) {
      var japan = topojson.feature(collection, collection.objects.japan).features;

      // Setup map
      var projection = d3.geo.mercator()
                         .scale(1500)
                         .center([137, 35])
                         .translate([w / 2, h / 2]);
      var path = d3.geo.path().projection(projection);

      g.selectAll('path')
        .data(japan)
        .enter()
        .append('path')
        .attr('d', path)
        .attr('prefecture', function(d) {
          return d.properties.name;
        })
        .style('fill', function(d, i) {
          return 'white';
        })
        .attr("stroke", "#404040")
        .attr("stroke-width", 0.5)
        .style('cursor', 'pointer')
        .on('mouseover', function(d){ // Mouse over action
          tooltip.style("opacity", 1)
            .html(d.properties['name']+'<br/>'+d.properties[currentKey])
            .style("left", (d3.event.pageX + 10) + "px")
            .style("top", (d3.event.pageY - 40) + "px");

        	var self = d3.select(this);
        	self.style('fill', 'red');
        }) 
        .on('mousemove', function(d){
          tooltip
            .style("left", (d3.event.pageX + 10) + "px")
            .style("top", (d3.event.pageY - 40) + "px");
        }) // Return to previous color once mouse moved out of region 
        .on('mouseout', function(d, i){
          tooltip.style("opacity", 0);
          
          //Show the year's color which is selected
        	var self = d3.select(this);
        	self.transition()
        	  .duration(300)
            .style('fill', function(d, i) {
              return color(d.properties[currentKey]);
            });
        });

        // Read csv data 
        d3.csv('jp_pop.csv', function(error, rows) {

          // Gather data from csv
          keys = Object.keys(rows[0]).filter(function(key){ return key !== 'prefecture'; });
          
          // Prepare sliderKeys for slider
          sliderKeys = svg.selectAll('.keys')
                          .data(keys)
                          .enter()[0]
                          .map(function(x) 
                          {
                            return x['__data__'] ;
                          });
   
          var total = sliderKeys.length,
              min = sliderKeys[0],
              difference = sliderKeys[1] - sliderKeys[0],
              max = sliderKeys[total-1];
          
          // Add a slider
          d3.select('.slider').call(
            d3.slider()
              .axis(true)
              .min(min)
              .max(max)
              .step(difference)
              .on("slide", function(evt, value) {
              currentKey = value;

              d3.selectAll('.keys')
                .classed("selected", function(){return (d3.select(this).attr('value') === currentKey)});
              updateMap();
            })
          );

          // Read population data for that year
          for (var i = 0; i < rows.length; i++) {
            var municipality = japan.filter(function(obj) {
              return (obj.properties['name'] === rows[i]['prefecture']);
            })[0];

            if (municipality) {
              keys.forEach(function(key){
                municipality.properties[key] = rows[i][key];
              });
        		}
          }

          // Set data to the first year when first load map
          currentKey = keys[0];
          updateMap();
        });
    });

    </script>

 </body>
</html>

japan.topojson

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jp_pop.csv

topojson.js

topojson = (function() {

  function merge(topology, arcs) {
    var arcsByEnd = {},
        fragmentByStart = {},
        fragmentByEnd = {};

    arcs.forEach(function(i) {
      var e = ends(i);
      (arcsByEnd[e[0]] || (arcsByEnd[e[0]] = [])).push(i);
      (arcsByEnd[e[1]] || (arcsByEnd[e[1]] = [])).push(~i);
    });

    arcs.forEach(function(i) {
      var e = ends(i),
          start = e[0],
          end = e[1],
          f, g;

      if (f = fragmentByEnd[start]) {
        delete fragmentByEnd[f.end];
        f.push(i);
        f.end = end;
        if (g = fragmentByStart[end]) {
          delete fragmentByStart[g.start];
          var fg = g === f ? f : f.concat(g);
          fragmentByStart[fg.start = f.start] = fragmentByEnd[fg.end = g.end] = fg;
        } else if (g = fragmentByEnd[end]) {
          delete fragmentByStart[g.start];
          delete fragmentByEnd[g.end];
          var fg = f.concat(g.map(function(i) { return ~i; }).reverse());
          fragmentByStart[fg.start = f.start] = fragmentByEnd[fg.end = g.start] = fg;
        } else {
          fragmentByStart[f.start] = fragmentByEnd[f.end] = f;
        }
      } else if (f = fragmentByStart[end]) {
        delete fragmentByStart[f.start];
        f.unshift(i);
        f.start = start;
        if (g = fragmentByEnd[start]) {
          delete fragmentByEnd[g.end];
          var gf = g === f ? f : g.concat(f);
          fragmentByStart[gf.start = g.start] = fragmentByEnd[gf.end = f.end] = gf;
        } else if (g = fragmentByStart[start]) {
          delete fragmentByStart[g.start];
          delete fragmentByEnd[g.end];
          var gf = g.map(function(i) { return ~i; }).reverse().concat(f);
          fragmentByStart[gf.start = g.end] = fragmentByEnd[gf.end = f.end] = gf;
        } else {
          fragmentByStart[f.start] = fragmentByEnd[f.end] = f;
        }
      } else if (f = fragmentByStart[start]) {
        delete fragmentByStart[f.start];
        f.unshift(~i);
        f.start = end;
        if (g = fragmentByEnd[end]) {
          delete fragmentByEnd[g.end];
          var gf = g === f ? f : g.concat(f);
          fragmentByStart[gf.start = g.start] = fragmentByEnd[gf.end = f.end] = gf;
        } else if (g = fragmentByStart[end]) {
          delete fragmentByStart[g.start];
          delete fragmentByEnd[g.end];
          var gf = g.map(function(i) { return ~i; }).reverse().concat(f);
          fragmentByStart[gf.start = g.end] = fragmentByEnd[gf.end = f.end] = gf;
        } else {
          fragmentByStart[f.start] = fragmentByEnd[f.end] = f;
        }
      } else if (f = fragmentByEnd[end]) {
        delete fragmentByEnd[f.end];
        f.push(~i);
        f.end = start;
        if (g = fragmentByEnd[start]) {
          delete fragmentByStart[g.start];
          var fg = g === f ? f : f.concat(g);
          fragmentByStart[fg.start = f.start] = fragmentByEnd[fg.end = g.end] = fg;
        } else if (g = fragmentByStart[start]) {
          delete fragmentByStart[g.start];
          delete fragmentByEnd[g.end];
          var fg = f.concat(g.map(function(i) { return ~i; }).reverse());
          fragmentByStart[fg.start = f.start] = fragmentByEnd[fg.end = g.start] = fg;
        } else {
          fragmentByStart[f.start] = fragmentByEnd[f.end] = f;
        }
      } else {
        f = [i];
        fragmentByStart[f.start = start] = fragmentByEnd[f.end = end] = f;
      }
    });

    function ends(i) {
      var arc = topology.arcs[i], p0 = arc[0], p1 = [0, 0];
      arc.forEach(function(dp) { p1[0] += dp[0], p1[1] += dp[1]; });
      return [p0, p1];
    }

    var fragments = [];
    for (var k in fragmentByEnd) fragments.push(fragmentByEnd[k]);
    return fragments;
  }

  function mesh(topology, o, filter) {
    var arcs = [];

    if (arguments.length > 1) {
      var geomsByArc = [],
          geom;

      function arc(i) {
        if (i < 0) i = ~i;
        (geomsByArc[i] || (geomsByArc[i] = [])).push(geom);
      }

      function line(arcs) {
        arcs.forEach(arc);
      }

      function polygon(arcs) {
        arcs.forEach(line);
      }

      function geometry(o) {
        if (o.type === "GeometryCollection") o.geometries.forEach(geometry);
        else if (o.type in geometryType) {
          geom = o;
          geometryType[o.type](o.arcs);
        }
      }

      var geometryType = {
        LineString: line,
        MultiLineString: polygon,
        Polygon: polygon,
        MultiPolygon: function(arcs) { arcs.forEach(polygon); }
      };

      geometry(o);

      geomsByArc.forEach(arguments.length < 3
          ? function(geoms, i) { arcs.push([i]); }
          : function(geoms, i) { if (filter(geoms[0], geoms[geoms.length - 1])) arcs.push([i]); });
    } else {
      for (var i = 0, n = topology.arcs.length; i < n; ++i) arcs.push([i]);
    }

    return object(topology, {type: "MultiLineString", arcs: merge(topology, arcs)});
  }

  function featureOrCollection(topology, o) {
    return o.type === "GeometryCollection" ? {
      type: "FeatureCollection",
      features: o.geometries.map(function(o) { return feature(topology, o); })
    } : feature(topology, o);
  }

  function feature(topology, o) {
    var f = {
      type: "Feature",
      id: o.id,
      properties: o.properties || {},
      geometry: object(topology, o)
    };
    if (o.id == null) delete f.id;
    return f;
  }

  function object(topology, o) {
    var tf = topology.transform,
        kx = tf.scale[0],
        ky = tf.scale[1],
        dx = tf.translate[0],
        dy = tf.translate[1],
        arcs = topology.arcs;

    function arc(i, points) {
      if (points.length) points.pop();
      for (var a = arcs[i < 0 ? ~i : i], k = 0, n = a.length, x = 0, y = 0, p; k < n; ++k) points.push([
        (x += (p = a[k])[0]) * kx + dx,
        (y += p[1]) * ky + dy
      ]);
      if (i < 0) reverse(points, n);
    }

    function point(coordinates) {
      return [coordinates[0] * kx + dx, coordinates[1] * ky + dy];
    }

    function line(arcs) {
      var points = [];
      for (var i = 0, n = arcs.length; i < n; ++i) arc(arcs[i], points);
      if (points.length < 2) points.push(points[0]);
      return points;
    }

    function ring(arcs) {
      var points = line(arcs);
      while (points.length < 4) points.push(points[0]);
      return points;
    }

    function polygon(arcs) {
      return arcs.map(ring);
    }

    function geometry(o) {
      var t = o.type;
      return t === "GeometryCollection" ? {type: t, geometries: o.geometries.map(geometry)}
          : t in geometryType ? {type: t, coordinates: geometryType[t](o)}
          : null;
    }

    var geometryType = {
      Point: function(o) { return point(o.coordinates); },
      MultiPoint: function(o) { return o.coordinates.map(point); },
      LineString: function(o) { return line(o.arcs); },
      MultiLineString: function(o) { return o.arcs.map(line); },
      Polygon: function(o) { return polygon(o.arcs); },
      MultiPolygon: function(o) { return o.arcs.map(polygon); }
    };

    return geometry(o);
  }

  function reverse(array, n) {
    var t, j = array.length, i = j - n; while (i < --j) t = array[i], array[i++] = array[j], array[j] = t;
  }

  function bisect(a, x) {
    var lo = 0, hi = a.length;
    while (lo < hi) {
      var mid = lo + hi >>> 1;
      if (a[mid] < x) lo = mid + 1;
      else hi = mid;
    }
    return lo;
  }

  function neighbors(objects) {
    var objectsByArc = [],
        neighbors = objects.map(function() { return []; });

    function line(arcs, i) {
      arcs.forEach(function(a) {
        if (a < 0) a = ~a;
        var o = objectsByArc[a] || (objectsByArc[a] = []);
        if (!o[i]) o.forEach(function(j) {
          var n, k;
          k = bisect(n = neighbors[i], j); if (n[k] !== j) n.splice(k, 0, j);
          k = bisect(n = neighbors[j], i); if (n[k] !== i) n.splice(k, 0, i);
        }), o[i] = i;
      });
    }

    function polygon(arcs, i) {
      arcs.forEach(function(arc) { line(arc, i); });
    }

    function geometry(o, i) {
      if (o.type === "GeometryCollection") o.geometries.forEach(function(o) { geometry(o, i); });
      else if (o.type in geometryType) geometryType[o.type](o.arcs, i);
    }

    var geometryType = {
      LineString: line,
      MultiLineString: polygon,
      Polygon: polygon,
      MultiPolygon: function(arcs, i) { arcs.forEach(function(arc) { polygon(arc, i); }); }
    };

    objects.forEach(geometry);
    return neighbors;
  }

  return {
    version: "1.0.0",
    mesh: mesh,
    feature: featureOrCollection,
    neighbors: neighbors
  };
})();