D3 Examples - Splitting a Rectangle

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<!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/1.5.0/d3-legend.js"></script>
    <link href='https://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'>
    <style>
    
      .axis text {
        font-family: 'Open Sans', sans-serif;
        font-size: 20pt;
      }
      .axis .label {
        font-size: 20pt;
      }
​
      .axis path, .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
      }
​
      .x.axis text {
        font-size: 20pt;
      }
      
      .color-legend text {
        font-family: 'Open Sans', sans-serif;
        font-size: 20pt;
      }
​
    </style>
  </head>
  <body>
    <script>
      var outerWidth = 900;
      var outerHeight = 500;
      var margin = { left: 64, top: 30, right: 212, bottom: 57 };
      var barPadding = 0.2;
​
      var xColumn = "region";
      var yColumn = "population";
      var colorColumn = "religion";
​
      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 yAxisG = g.append("g")
        .attr("class", "y axis");
      var colorLegendG = g.append("g")
        .attr("class", "color-legend")
        .attr("transform", "translate(593, 0)");
​
      var xScale = d3.scale.ordinal().rangeBands([0, innerWidth], barPadding);
      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")
        .outerTickSize(0);
      var yAxis = d3.svg.axis().scale(yScale).orient("left")
        .ticks(5)
        .tickFormat(customTickFormat)
        .outerTickSize(0);
      
      var colorLegend = d3.legend.color()
        .scale(colorScale)
        .shapePadding(5)
        .shapeWidth(30)
        .shapeHeight(30)
        .labelOffset(6)
        .ascending(true);
​
      function render(data){
​
        colorScale.domain(data.map(function (d){ return d[colorColumn]; }));
​
        var stack = d3.layout.stack()
          .y(function (d){ return d[yColumn]; })
          .values(function (d){ return [d]; });
​
        var stacked = stack(data);
​
        xScale.domain(stacked.map(function (d){ return d[xColumn]; }));
        yScale.domain([0, d3.max(stacked, function (d){ return d.y0 + d.y; })]);
​
        xAxisG.call(xAxis);
        yAxisG.call(yAxis);
​
        var bars = g.selectAll("rect").data(stacked);
        bars.enter().append("rect")
          .attr("width", xScale.rangeBand());
        bars
          .attr("x", function (d){ return xScale(d[xColumn]); })
          .attr("y", function (d){ return yScale(d.y0 + d.y); })
          .attr("height", function (d){ return innerHeight - yScale(d.y); })
          .attr("fill", function (d){ return colorScale(d[colorColumn]); });
        bars.exit().remove();
        
        colorLegendG.call(colorLegend);
      }
​
      function type(d){
        d.region = "World";
        d.population = +d.population;
        return d;
      }
​
      d3.csv("religionWorldTotals.csv", type, render);
​
    </script>
  </body>
</html>
​
    