NVD3 Stacked Bar Chart

Slightly modified code from multiBar example at http://nvd3.org/livecode/#codemirrorNav to demonstrate defaulting to stacked bar.

by Mark

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.2.2/d3.v3.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/nvd3/1.0.0-beta/nv.d3.js"></script>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/nvd3/1.0.0-beta/nv.d3.css">
<div id="chart">
  <svg></svg>
</div>

CSS

#chart svg {
  height: 400px;
}

JavaScript

// Slightly modified code from multiBar example at
// http://nvd3.org/livecode/#codemirrorNav
// to demonstrate defaulting to stacked bar

var data = function() {
  return stream_layers(3,10+Math.random()*100,.1).map(function(data, i) {
    return {
      key: 'Stream' + i,
      values: data
    };
  });
}

/* Inspired by Lee Byron's test data generator. */
function stream_layers(n, m, o) {
  if (arguments.length < 3) o = 0;
  function bump(a) {
    var x = 1 / (.1 + Math.random()),
        y = 2 * Math.random() - .5,
        z = 10 / (.1 + Math.random());
    for (var i = 0; i < m; i++) {
      var w = (i / m - y) * z;
      a[i] += x * Math.exp(-w * w);
    }
  }
  return d3.range(n).map(function() {
      var a = [], i;
      for (i = 0; i < m; i++) a[i] = o + o * Math.random();
      for (i = 0; i < 5; i++) bump(a);
      return a.map(stream_index);
    });
}

/* Another layer generator using gamma distributions. */
function stream_waves(n, m) {
  return d3.range(n).map(function(i) {
    return d3.range(m).map(function(j) {
        var x = 20 * j / m - i / 3;
        return 2 * x * Math.exp(-.5 * x);
      }).map(stream_index);
    });
}

function stream_index(d, i) {
  return {x: i, y: Math.max(0, d)};
}

nv.addGraph(function() {
    var chart = nv.models.multiBarChart();

    chart.xAxis
        .tickFormat(d3.format(',f'));

    chart.yAxis
        .tickFormat(d3.format(',.1f'));
    
    chart.multibar.stacked(true); // default to stacked
    chart.showControls(false); // don't show controls

    d3.select('#chart svg')
        .datum(data())
      .transition().duration(500).call(chart);

    nv.utils.windowResize(chart.update);

    return chart;
});