Stacked Area Chart by curran

index.html


<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>D3 Example</title>
    <script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/d3-legend/1.6.0/d3-legend.js"></script>
    <link href='https://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'>
        
    <style>
      
      body {
        margin: 0px;
      }

      .axis text {
        font-family: 'Open Sans', sans-serif;
        font-size: 12pt;
      }
      
      .axis .label {
        font-size: 18pt;
      }

      .axis path, .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
      }

      .color-legend text {
        font-family: 'Open Sans', sans-serif;
        font-size: 12pt;
      }

    </style>
  </head>
  <body>
    <script>
    
      var outerWidth = 960;
      var outerHeight = 500;
      var margin = { left: 86, top: 5, right: 5, bottom: 56 };

      var xColumn = "year";
      var yColumn = "population";
      var colorColumn = "country";
      var areaColumn = colorColumn;

      var xAxisLabelText = "Time";
      var xAxisLabelOffset = 48;

      var yAxisLabelText = "Population";
      var yAxisLabelOffset = 60;

      var innerWidth  = outerWidth  - margin.left - margin.right;
      var innerHeight = outerHeight - margin.top  - margin.bottom;

      var svg = d3.select("body").append("svg")
        .attr("width", outerWidth)
        .attr("height", outerHeight);
      var g = svg.append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

      var xAxisG = g.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + innerHeight + ")")
      var xAxisLabel = xAxisG.append("text")
        .style("text-anchor", "middle")
        .attr("transform", "translate(" + (innerWidth / 2) + "," + xAxisLabelOffset + ")")
        .attr("class", "label")
        .text(xAxisLabelText);

      var yAxisG = g.append("g")
        .attr("class", "y axis");
      var yAxisLabel = yAxisG.append("text")
        .style("text-anchor", "middle")
        .attr("transform", "translate(-" + yAxisLabelOffset + "," + (innerHeight / 2) + ") rotate(-90)")
        .attr("class", "label")
        .text(yAxisLabelText);

      var colorLegendG = g.append("g")
        .attr("class", "color-legend")
        .attr("transform", "translate(16, 2)");

      var xScale = d3.time.scale().range([0, innerWidth]);
      var yScale = d3.scale.linear().range([innerHeight, 0]);
      var colorScale = d3.scale.category10();

      // Use a modified SI formatter that uses "B" for Billion.
      var siFormat = d3.format("s");
      var customTickFormat = function (d){
        return siFormat(d).replace("G", "B");
      };

      var xAxis = d3.svg.axis().scale(xScale).orient("bottom")
        .ticks(10)
        .outerTickSize(0);
      var yAxis = d3.svg.axis().scale(yScale).orient("left")
        .ticks(13)
        .tickFormat(customTickFormat)
        .outerTickSize(0);
      
      var stack = d3.layout.stack()
        .y(function (d){ return d[yColumn]; })
        .values(function (d){ return d.values; });

      var area = d3.svg.area()
        .x(function(d) { return xScale(d[xColumn]); })
        .y0(function(d) { return yScale(d.y0); })
        .y1(function(d) { return yScale(d.y0 + d.y); });

      var colorLegend = d3.legend.color()
        .scale(colorScale)
        .shapePadding(3)
        .shapeWidth(15)
        .shapeHeight(15)
        .labelOffset(4)
        .ascending(true);

      function render(data){
        
        var nested = d3.nest()
          .key(function (d){ return d[areaColumn]; })
          .entries(data);
        
        var layers = stack(nested);

        xScale.domain(d3.extent(data, function (d){ return d[xColumn]; }));
        yScale.domain([
          0,
          d3.max(layers, function (layer){
            return d3.max(layer.values, function (d){
              return d.y0 + d.y;
            });
          })
        ]);
        
        xAxisG.call(xAxis);
        yAxisG.call(yAxis);

        

        colorScale.domain(nested.map(function (d){ return d.key; }));

        var paths = g.selectAll(".chart-area").data(layers);
        paths.enter().append("path").attr("class", "chart-line");
        paths.exit().remove();
        paths
          .attr("d", function (d){ return area(d.values); })
          .attr("fill", function (d){ return colorScale(d.key); });

        colorLegendG.call(colorLegend);
      }

      function type(d){
        d.year = new Date(d.year);
        d.population = +d.population;
        return d;
      }

      d3.csv("populationByCountryByYear.csv", type, render);

    </script>
  </body>
</html>