[unlisted] grouped bar experimenting

forked from stelt's block: grouped bar experimenting

<!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/1.1.0/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: 36pt;
        fill:lightgrey;
      }
      .y.axis text{
        font-size: 20pt;
        fill:black;
      }
      .axis .label {
        font-size: 30000pt;
      }
      .axis path, .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
      }
    </style>
  </head>
  <body>
    <script>
      var outerWidth = 800;
      var outerHeight = 438;
      var margin = { left: 90, top: 30, right: 30, bottom: 40 };
      var barPadding = 0.02;

var xColumn = "year";
      var yColumn = "measurement";
      var colorColumn = "period";
      var layerColumn = colorColumn;

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

var svg = d3.select("body").append("svg")
        .attr({width:outerWidth,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 xScale = d3.scale.ordinal().rangeBands([0, innerWidth], barPadding);
      var yScale = d3.scale.linear().range([innerHeight, 0]);
      var colorScale = d3.scale.ordinal().range(["red","green","blue","yellow"]);

var xAxis = d3.svg.axis().scale(xScale).orient("bottom")
        .outerTickSize(0).innerTickSize(0);
      var yAxis = d3.svg.axis().scale(yScale).orient("left")
        .ticks(5).tickFormat(d3.format("s")).outerTickSize(0).innerTickSize(5);

// ###########################################################################
      function render(data){
        var nested = d3.nest()
          .key(function (d){ return d[layerColumn]; })
          .entries(data)
        var stack = d3.layout.stack()
          .y(function (d){ return d[yColumn]; })
          .values(function (d){ return d.values; });
        var layers = stack(nested); 
        console.log(layers)

var totals=[];
        for (q=0;q<data.length-2;q+=3){
          totals.push(data[q].measurement+data[q+1].measurement+data[q+2].measurement)
        }
        yScale.domain([0,d3.max(totals)])
        xScale.domain(layers[0].values.map(function (d){return d[xColumn];}))

colorScale.domain(layers.map(function (layer){return layer.key}));

xAxisG.call(xAxis);  
        yAxisG.call(yAxis);

var layers = g.selectAll(".layer").data(layers);
        layers.enter().append("g").attr("class", "layer");
        layers.exit().remove();
        layers.style("fill", function (d){
          return colorScale(d.key);
        });

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

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js

https://cdnjs.cloudflare.com/ajax/libs/d3-legend/1.1.0/d3-legend.js