configurable and robust line chart

README.md

This line chart is constructed from a TSV file storing the daily average temperatures of New York, San Francisco and Austin over the last year. The chart employs conventional margins and a number of D3 features:

• d3.tsv - load and parse data
• d3.time.format - parse dates
• d3.time.scale - x-position encoding
• d3.scale.linear - y-position encoding
• d3.scale.category10, a d3.scale.ordinal - color encoding
• d3.extent, d3.min and d3.max - compute domains
• d3.keys - compute column names
• d3.svg.axis - display axes
• d3.svg.line - display line shape

d3.min.js

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q&&(c-=f,l-=v+f),r=(e?d:p)?Math.max(c,Math.min(l,n[e])):n[e],q?u=(r+=f)+v:(x&&(f=Math.max(c,Math.min(l,2*x[e]-r))),r>f?(u=r,r=f):u=f),g[0]!=r||g[1]!=u?(e?o=null:i=null,g[0]=r,g[1]=u,!0):void 0}function M(){m(),E.style("pointer-events","all").selectAll(".resize").style("display",n.empty()?"none":null),vo.select("body").style("cursor",null),C.on("mousemove.brush",null).on("mouseup.brush",null).on("touchmove.brush",null).on("touchend.brush",null).on("keydown.brush",null).on("keyup.brush",null),T(),S({type:"brushend"})}var x,b,_=this,w=vo.select(vo.event.target),S=a.of(_,arguments),E=vo.select(_),k=w.datum(),A=!/^(n|s)$/.test(k)&&c,N=!/^(e|w)$/.test(k)&&l,q=w.classed("extent"),T=L(),z=u(),C=vo.select(bo).on("keydown.brush",g).on("keyup.brush",v);if(vo.event.changedTouches?C.on("touchmove.brush",m).on("touchend.brush",M):C.on("mousemove.brush",m).on("mouseup.brush",M),E.interrupt().selectAll("*").interrupt(),q)z[0]=s[0]-z[0],z[1]=h[0]-z[1];else if(k){var D=+/w$/.test(k),j=+/^n/.test(k);b=[s[1-D]-z[0],h[1-j]-z[1]],z[0]=s[D],z[1]=h[j]}else vo.event.altKey&&(x=z.slice());E.style("pointer-events","none").selectAll(".resize").style("display",null),vo.select("body").style("cursor",w.style("cursor")),S({type:"brushstart"}),m()}var i,o,a=g(n,"brushstart","brush","brushend"),c=null,l=null,s=[0,0],h=[0,0],p=!0,d=!0,v=Xc[0];return n.event=function(n){n.each(function(){var n=a.of(this,arguments),t={x:s,y:h,i:i,j:o},e=this.__chart__||t;this.__chart__=t,Fc?vo.select(this).transition().each("start.brush",function(){i=e.i,o=e.j,s=e.x,h=e.y,n({type:"brushstart"})}).tween("brush:brush",function(){var e=kr(s,t.x),r=kr(h,t.y);return i=o=null,function(u){s=t.x=e(u),h=t.y=r(u),n({type:"brush",mode:"resize"})}}).each("end.brush",function(){i=t.i,o=t.j,n({type:"brush",mode:"resize"}),n({type:"brushend"})}):(n({type:"brushstart"}),n({type:"brush",mode:"resize"}),n({type:"brushend"}))})},n.x=function(t){return arguments.length?(c=t,v=Xc[!c<<1|!l],n):c},n.y=function(t){return arguments.length?(l=t,v=Xc[!c<<1|!l],n):l},n.clamp=function(t){return arguments.length?(c&&l?(p=!!t[0],d=!!t[1]):c?p=!!t:l&&(d=!!t),n):c&&l?[p,d]:c?p:l?d:null},n.extent=function(t){var e,r,u,a,f;return arguments.length?(c&&(e=t[0],r=t[1],l&&(e=e[0],r=r[0]),i=[e,r],c.invert&&(e=c(e),r=c(r)),e>r&&(f=e,e=r,r=f),(e!=s[0]||r!=s[1])&&(s=[e,r])),l&&(u=t[0],a=t[1],c&&(u=u[1],a=a[1]),o=[u,a],l.invert&&(u=l(u),a=l(a)),u>a&&(f=u,u=a,a=f),(u!=h[0]||a!=h[1])&&(h=[u,a])),n):(c&&(i?(e=i[0],r=i[1]):(e=s[0],r=s[1],c.invert&&(e=c.invert(e),r=c.invert(r)),e>r&&(f=e,e=r,r=f))),l&&(o?(u=o[0],a=o[1]):(u=h[0],a=h[1],l.invert&&(u=l.invert(u),a=l.invert(a)),u>a&&(f=u,u=a,a=f))),c&&l?[[e,u],[r,a]]:c?[e,r]:l&&[u,a])},n.clear=function(){return n.empty()||(s=[0,0],h=[0,0],i=o=null),n},n.empty=function(){return!!c&&s[0]==s[1]||!!l&&h[0]==h[1]},vo.rebind(n,a,"on")};var Zc={n:"ns-resize",e:"ew-resize",s:"ns-resize",w:"ew-resize",nw:"nwse-resize",ne:"nesw-resize",se:"nwse-resize",sw:"nesw-resize"},Xc=[["n","e","s","w","nw","ne","se","sw"],["e","w"],["n","s"],[]],Bc=vo.time={},$c=Date,Wc=["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];zi.prototype={getDate:function(){return this._.getUTCDate()},getDay:function(){return this._.getUTCDay()},getFullYear:function(){return this._.getUTCFullYear()},getHours:function(){return this._.getUTCHours()},getMilliseconds:function(){return this._.getUTCMilliseconds()},getMinutes:function(){return this._.getUTCMinutes()},getMonth:function(){return this._.getUTCMonth()},getSeconds:function(){return this._.getUTCSeconds()},getTime:function(){return this._.getTime()},getTimezoneOffset:function(){return 0},valueOf:function(){return 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Math.floor((Bc.dayOfYear(n)+(e+t)%7)/7)}}),Bc.week=Bc.sunday,Bc.weeks=Bc.sunday.range,Bc.weeks.utc=Bc.sunday.utc.range,Bc.weekOfYear=Bc.sundayOfYear,Bc.format=ji;var ul=Hi(nl),il=Fi(nl),ol=Hi(tl),al=Fi(tl),cl=Hi(el),ll=Fi(el),sl=Hi(rl),fl=Fi(rl),hl=/^%/,gl={"-":"",_:" ",0:"0"},pl={a:function(n){return tl[n.getDay()]},A:function(n){return nl[n.getDay()]},b:function(n){return rl[n.getMonth()]},B:function(n){return el[n.getMonth()]},c:ji(Gc),d:function(n,t){return Pi(n.getDate(),t,2)},e:function(n,t){return Pi(n.getDate(),t,2)},H:function(n,t){return Pi(n.getHours(),t,2)},I:function(n,t){return Pi(n.getHours()%12||12,t,2)},j:function(n,t){return Pi(1+Bc.dayOfYear(n),t,3)},L:function(n,t){return Pi(n.getMilliseconds(),t,3)},m:function(n,t){return Pi(n.getMonth()+1,t,2)},M:function(n,t){return Pi(n.getMinutes(),t,2)},p:function(n){return n.getHours()>=12?"PM":"AM"},S:function(n,t){return Pi(n.getSeconds(),t,2)},U:function(n,t){return Pi(Bc.sundayOfYear(n),t,2)},w:function(n){return n.getDay()},W:function(n,t){return Pi(Bc.mondayOfYear(n),t,2)},x:ji(Kc),X:ji(Qc),y:function(n,t){return Pi(n.getFullYear()%100,t,2)},Y:function(n,t){return Pi(n.getFullYear()%1e4,t,4)},Z:oo,"%":function(){return"%"}},dl={a:Oi,A:Ri,b:Vi,B:Zi,c:Xi,d:Qi,e:Qi,H:to,I:to,j:no,L:uo,m:Ki,M:eo,p:io,S:ro,U:Ii,w:Yi,W:Ui,x:Bi,X:$i,y:Ji,Y:Wi,"%":ao},vl=/^\s*\d+/,ml=vo.map({am:0,pm:1});ji.utc=co;var yl=co("%Y-%m-%dT%H:%M:%S.%LZ");ji.iso=Date.prototype.toISOString&&+new Date("2000-01-01T00:00:00.000Z")?lo:yl,lo.parse=function(n){var t=new Date(n);return isNaN(t)?null:t},lo.toString=yl.toString,Bc.second=Ci(function(n){return new $c(1e3*Math.floor(n/1e3))},function(n,t){n.setTime(n.getTime()+1e3*Math.floor(t))},function(n){return n.getSeconds()}),Bc.seconds=Bc.second.range,Bc.seconds.utc=Bc.second.utc.range,Bc.minute=Ci(function(n){return new $c(6e4*Math.floor(n/6e4))},function(n,t){n.setTime(n.getTime()+6e4*Math.floor(t))},function(n){return n.getMinutes()}),Bc.minutes=Bc.minute.range,Bc.minutes.utc=Bc.minute.utc.range,Bc.hour=Ci(function(n){var t=n.getTimezoneOffset()/60;return new $c(36e5*(Math.floor(n/36e5-t)+t))},function(n,t){n.setTime(n.getTime()+36e5*Math.floor(t))},function(n){return n.getHours()}),Bc.hours=Bc.hour.range,Bc.hours.utc=Bc.hour.utc.range,Bc.month=Ci(function(n){return n=Bc.day(n),n.setDate(1),n},function(n,t){n.setMonth(n.getMonth()+t)},function(n){return n.getMonth()}),Bc.months=Bc.month.range,Bc.months.utc=Bc.month.utc.range;var Ml=[1e3,5e3,15e3,3e4,6e4,3e5,9e5,18e5,36e5,108e5,216e5,432e5,864e5,1728e5,6048e5,2592e6,7776e6,31536e6],xl=[[Bc.second,1],[Bc.second,5],[Bc.second,15],[Bc.second,30],[Bc.minute,1],[Bc.minute,5],[Bc.minute,15],[Bc.minute,30],[Bc.hour,1],[Bc.hour,3],[Bc.hour,6],[Bc.hour,12],[Bc.day,1],[Bc.day,2],[Bc.week,1],[Bc.month,1],[Bc.month,3],[Bc.year,1]],bl=[[ji("%Y"),Zt],[ji("%B"),function(n){return n.getMonth()}],[ji("%b %d"),function(n){return 1!=n.getDate()}],[ji("%a %d"),function(n){return n.getDay()&&1!=n.getDate()}],[ji("%I %p"),function(n){return n.getHours()}],[ji("%I:%M"),function(n){return n.getMinutes()}],[ji(":%S"),function(n){return n.getSeconds()}],[ji(".%L"),function(n){return n.getMilliseconds()}]],_l=ho(bl);xl.year=Bc.year,Bc.scale=function(){return so(vo.scale.linear(),xl,_l)};var wl={range:function(n,t,e){return vo.range(+n,+t,e).map(fo)}},Sl=xl.map(function(n){return[n[0].utc,n[1]]}),El=[[co("%Y"),Zt],[co("%B"),function(n){return n.getUTCMonth()}],[co("%b %d"),function(n){return 1!=n.getUTCDate()}],[co("%a %d"),function(n){return n.getUTCDay()&&1!=n.getUTCDate()}],[co("%I %p"),function(n){return n.getUTCHours()}],[co("%I:%M"),function(n){return n.getUTCMinutes()}],[co(":%S"),function(n){return n.getUTCSeconds()}],[co(".%L"),function(n){return n.getUTCMilliseconds()}]],kl=ho(El);return Sl.year=Bc.year.utc,Bc.scale.utc=function(){return so(vo.scale.linear(),Sl,kl)},vo.text=vt(function(n){return n.responseText}),vo.json=function(n,t){return mt(n,"application/json",go,t)},vo.html=function(n,t){return mt(n,"text/html",po,t)},vo.xml=vt(function(n){return n.responseXML}),vo}();

data.tsv

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="line.css" />
</head>
<body>
    <div id="test"></div>
    <div id="test2"></div>
    
<script src="d3.min.js"></script>
<script src="line.js"></script>
</body>
</html>

line.css

body {
  font: 10px sans-serif;
}

        svg rect {
            fill:black;
  opacity:0.1;
            
        }

        .focus {
            fill:green;
            opacity:0.3;
        }

        .context {
            fill:blue;
            opacity:0.3;

        }

#test {
    border:2px dashed;
}

.axis path,
.axis line {
  fill: none;
  opacity:0.1;
  stroke: #000;
  stroke-width:1px;
  shape-rendering: crispEdges;
}

.line {
  fill: none;
  stroke-width: 1.5px;
  opacity: 0.8;
//-moz-transition: stroke-width 1s; 
//transition: stroke-width 1s;
}
.line:hover {
  opacity: 1;
}

line.js

var WIDTH = 800;
var HEIGHT = 500;
var HEIGHT_FOCUS = 400;
var HEIGHT_CONTEXT = 20;
var TOP_MARGIN = 10;
var BOTTOM_MARGIN = 20;
var LEFT_MARGIN = 40;
var RIGHT_MARGIN = 20;
var MIDDLE_MARGIN = null; // to be determined
var DATE_PARSER = d3.time.format("%Y%m%d").parse;
var DEBUG_OUT = true;

var log = function(debug){
    if (DEBUG_OUT){
        console.log(debug);
    }
};


gen_graph_id = function() {
        return ("0000" + (Math.random()*Math.pow(36,4) << 0).toString(36)).substr(-4)
}
/* Helpers */
// Validates data before it gets put into the graph
// TODO more helpfull error messages
// were assumed given an array of objects matching example_line_data_input
function check_data (d) {
     if(d == null ||(typeof d !== 'object' )){
         throw new Error("Supplied data ");
     }
     if (!(d.x instanceof Array)){
         throw new Error("Supplied data does not have array of x values.");
     }
     if (!(d.y instanceof Array)){
         throw new Error("Supplied data does not have array of y values.");
     }
};

// Wanted API
// var chart = chart_line("#test");
// chart.hide_horizontal_lines(); chart.hide_horizontal_lines(false);
// chart.add_data(example_line_data_input);
// chart.update();
// chart.update(example_line_data_input);

function chart_line(selection) {
    var svg;                    // handle on our graph
    var id = gen_graph_id();    // id per graph
    var data_sets = d3.map();   // for holding id's of each inserted data set

    // Dimensions
    var margin = { 
        top:TOP_MARGIN, bottom:BOTTOM_MARGIN,
        left:LEFT_MARGIN, right: RIGHT_MARGIN, 
        middle: MIDDLE_MARGIN
    };

    var svg_width    = WIDTH;
    var svg_height   = HEIGHT;
    var width        = WIDTH  - margin.left - margin.right;
    var height       = HEIGHT - margin.top  - margin.bottom;

    var height_focus   = HEIGHT_FOCUS;
    var height_context = HEIGHT_CONTEXT;

    if(height_context + height_focus >= height){
        throw new Error("Bad Dimensions");
    }else {
        margin.middle = height - height_context - height_focus;
    }
    var trans_string_focus = "translate(" + margin.left + "," + margin.top + ")";
    var trans_string_context = "translate(" + margin.left + "," +
            (margin.top+margin.middle+height_focus)+ ")";
    var trans_string_x_axis_focus = "translate(0," + (height_focus)+ ")";
    var trans_string_x_axis_context = "translate(0," + (height_context)+ ")";

    var x_focus = d3.time.scale()
        .range([0, width]);
    var x_context = d3.time.scale()
        .range([0, width]);

    var y_focus = d3.scale.linear()
        .range([height_focus, 0]);
    var y_context = d3.scale.linear()
        .range([height_context, 0]);

    var x_axis_focus = d3.svg.axis().scale(x_focus)
        .orient("bottom")
        .tickSize(-height_focus)

    var x_axis_context = d3.svg.axis().scale(x_context)
        .orient("bottom")
        .tickSize(-height_context)

    var y_axis_focus = d3.svg.axis().scale(y_focus)
        .orient("left")
        .tickSize(-width);

    var _x_domain_ = [];
    var _y_domain_ = [];

    //Fancy Behaviors
    var brush = d3.svg.brush()
            .x(x_context)
            .on("brush",update_svg);

    var voronoi = d3.geom.voronoi()
    .x(function(d){return x_focus(d.x);})
    .y(function(d){return y_focus(d.y);});
    // colors and styles
    var color = d3.scale.category10();

    // Line options
    var line_generator = d3.svg.line()
        .interpolate("cardinal")
        .defined(function(d) { return !isNaN(d.y); })
        .x(function(d) { return x_focus(d.x); })
        .y(function(d) { return y_focus(d.y); });

    // set up our graph and axis on inital data
    // TODO use __data__ as customizer 
    svg = d3.select(selection).append('svg')
            .attr("id","chart-line-graph-"+ id) 
            .classed('chart-line', true)
            //TODO display:none and smooth transition in.
            .classed('chart-no-data', true) 
            .attr("width",  svg_width)
            .attr("height", svg_height);

    svg.append("rect")
        .attr("width",  svg_width)
        .attr("height", svg_height);

         
    // bound our graph when zooming
    var clip = svg.append("defs").append("clipPath")
        .attr("id", "clip-graph")
        .append("rect")
        .attr("width", width )
        .attr("height", height_focus )
        //.attr("transform", trans_string_focus);


    // create our two seperate graph holders
    var focus = svg.append("g")
        .attr("width",  width)
        .attr("height", height_focus)
              .attr("transform", trans_string_focus);


    var context = svg.append("g")
              .attr("transform", trans_string_context);

    // testing purposes
    focus.append("rect")
        .attr("class","focus")
        .attr("width",  width)
        .attr("height", height_focus);

    focus.append("g")
          .attr("class", "x axis")
              .attr("transform", trans_string_x_axis_focus)
          .call(x_axis_focus);

    focus.append("g")
          .attr("class", "y axis")
          .call(y_axis_focus);

    clips = focus.append("g")
        .attr("class", "clips");

     paths = focus.append("g")
         .attr("class", "bubble")
        .attr("clip-path", "url(#clip-graph)");

    // testing purposes
    context.append("rect")
        .attr("class","context")
        .attr("width",  width)
        .attr("height", height_context);

    context.append("g")
          .attr("class", "x axis")
              .attr("transform", trans_string_x_axis_context)
          .call(x_axis_context);


    /* public object and methods
    * We follow a chaining pattern and getter setter method pattern.
    */
    var graph = {};

    // TODO Expose accessor
    graph.default_data_accessor = function(data){
        return data.data_points;
    }

    graph.remove_data = function(data){
        //check_data(data); 
        if(!data_sets.has(data.id)){
            throw new Error("Trying to remove a non-exsistant data object");
        } else {
            remove(data);
        }
    }

    // TODO add id if not set
    graph.add_data = function (data){
        //check_data(data); 
        if(data_sets.has(data.id)){
            throw new Error("Trying to add an already inserted data object");
            //graph.update(data);
        } else {
            insert(data);
        }

    };

    /* Handles the maintence of the graphs domains on both insert and removal of data.
     * Any objects which depend on x and y scales are updated in here.
     * WARN: does not apply changes to dom elements, only the javascript d3.axis objects
     */
    function maintain_extent(data){
        points = graph.default_data_accessor(data);
        var new_x = d3.extent(points, function(d) { return d.x; });
        var new_y = d3.extent(points, function(d) { return +d.y; });
        // Already inserted so remove. May reduce extent of domains
        if(data_sets.has(data.id)){
            _x_domain_.splice(_x_domain_.indexOf(new_x[0]),1);
            _x_domain_.splice(_x_domain_.indexOf(new_x[1]),1);
            _y_domain_.splice(_y_domain_.indexOf(new_y[0]),1);
            _y_domain_.splice(_y_domain_.indexOf(new_y[1]),1);
        } else {
            // new, might extend
            _x_domain_ = _x_domain_.concat(new_x);
            _y_domain_ = _y_domain_.concat(new_y);
        }
        old_x_focus = JSON.stringify(x_focus.domain());
        old_y_focus = JSON.stringify(y_focus.domain());
        //reapply possible changes  domain;
        x_focus.domain(d3.extent(_x_domain_));
        y_focus.domain(d3.extent(_y_domain_));

        new_x_focus = JSON.stringify(x_focus.domain());
        new_y_focus = JSON.stringify(y_focus.domain());

        if(old_x_focus != new_x_focus){
            //log(old_x_focus);
            //log(new_x_focus);
        }
        if(old_y_focus != new_y_focus){
            //log(old_y_focus);
            //log(new_y_focus);
        }

    }

    /* Help squished axis labels to be seen better
     * TODO: extend odd tick lines up to text
     */
    function unsquish_labels(){
        /*
        var prev = 0;
        svg.selectAll(".x.axis g").each(
            function(d,i){ 
            node = d3.select(this)
            //bbox = this.getExtentOfChar();
            var p_old = +node.attr("y"); 
            var p = (i % 2 == 0)? 0: 10; 
            node.attr("y",p_old +p); 
            log(this.textContent, this.getBBox());
        });
       */
    }

    // Applys maintaince methods to svg elements
    function update_svg() {
        //Global Updates
        // update axes
        focus.select(".x.axis").call(x_axis_focus) 
        .selectAll("text")
        .attr("transform", "rotate(-45)")
        .style("text-anchor", "end");
        focus.select(".y.axis").call(y_axis_focus);

        // Specific Line Updates
        // fix lines
        focus.selectAll("g.chart-data-points").each(function(d,i){
            elem = d3.select(this)
            data = data_sets.get(elem.attr("x-graph-id"));
            elem.selectAll(".line")
                .attr("d", function(d) { return line_generator(d); });
        });

    }

    function remove(data) {
        svg.selectAll("g.chart-data-points[x-graph-id='" + data.id + "']").remove();
        maintain_extent(data); 
        update_svg();
        data_sets.remove(data.id);
    }

    function key_func_points(d){
        return d.x.toUTCString()+":"+String(d.y);
    }
    function key_func_paths(d){
        return d.x+":"+d.y;
    }

    function insert(data) {
        var points = graph.default_data_accessor(data);
        maintain_extent(data); // must call before setting our data_sets map with the new id
        data_sets.set(""+data.id, data);

        update_svg();

        total_points = [];
        data_sets.forEach(function(k,v){
          total_points=  total_points.concat(graph.default_data_accessor(v)); 
        })

        var line = focus.append("g").datum(points)
        .attr("class","chart-data-points")
        .attr("x-graph-id", data.id);

        line.append("path").attr("class", "line")
            .attr("clip-path", "url(#clip-graph)").attr("d", function(d) { return line_generator(d); })
            .style("stroke", function() {return color(data.id);})

    }


    graph.get_id = function(obj_a, obj_b) {
        //TODO: check if obj and if it even has id
        //check_data(obj_a);
        //check_data(obj_b);
        return obj_a.id == obj_b.id ? true : false;
    }


   return graph;
}

var example_line_data_input = {
    name: "funky data",
    description: "This is an example of how funky data changes over time.",
    id:"test",
    data_points: [
        {
            x: "20111001",
            y: 30,
        },
        {
            x: "20120927",
            y: 70,
        }
    ]
};

var cities;
chart = chart_line("#test");
d3.tsv("data.tsv", function(error, data) {
    // get header names of cities
    city_names = d3.keys(data[0]).filter(function(key) { return key !== "date"; });


  cities = city_names.map(function(name,i) {
    return {
      name: name,
      id:i,
      data_points: data.map(function(d) {
        return {x: DATE_PARSER(d.date), y: +d[name]};
      })
    };
  });
    /*cities.forEach(function(d){
        chart.add_data(d);
    });*/
chart.add_data(cities[0]);
chart.add_data(cities[1]);
chart.add_data(cities[2]);
//chart.remove_data(cities[0]);
//chart.remove_data(cities[2]);
});

thumbnail.png