D3 Examples - Google requests treemap

Google requests treemap

A treemap recursively subdivides area into rectangles; the area of any node in the tree corresponds to its value. This example uses color to encode different packages of the Flare visualization toolkit. Treemap design invented by Ben Shneiderman. Squarified algorithm by Bruls, Huizing and van Wijk. Data courtesy Jeff Heer.

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<!DOCTYPE html>
<style>
​
form {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
​
svg {
  font: 10px sans-serif;
}
​
</style>
<svg width="325" height="400"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");
​
var fader = function(color) { return d3.interpolateRgb(color, "#fff")(0.2); },
    color = d3.scaleOrdinal(d3.schemeCategory20.map(fader)),
    format = d3.format(",d");
​
var treemap = d3.treemap()
    .tile(d3.treemapResquarify)
    .size([width, height])
    .round(true)
    .paddingInner(1);
​
d3.json("flare.json", function(error, data) {
  if (error) throw error;
​
  var root = d3.hierarchy(data)
      .eachBefore(function(d) { d.data.id = (d.parent ? d.parent.data.id + "." : "") + d.data.name; })
      .sum(sumBySize)
      .sort(function(a, b) { return b.height - a.height || b.value - a.value; });
​
  treemap(root);
​
  var cell = svg.selectAll("g")
    .data(root.leaves())
    .enter().append("g")
      .attr("transform", function(d) { return "translate(" + d.x0 + "," + d.y0 + ")"; });
​
  cell.append("rect")
      .attr("id", function(d) { return d.data.id; })
      .attr("width", function(d) { return d.x1 - d.x0; })
      .attr("height", function(d) { return d.y1 - d.y0; })
      .attr("fill", function(d) { return color(d.parent.data.id); });
​
  cell.append("clipPath")
      .attr("id", function(d) { return "clip-" + d.data.id; })
    .append("use")
      .attr("xlink:href", function(d) { return "#" + d.data.id; });
​
  cell.append("text")
      .attr("clip-path", function(d) { return "url(#clip-" + d.data.id + ")"; })
    .selectAll("tspan")
      .data(function(d) { return d.data.name.split(/(?=[A-Z][^A-Z])/g); })
    .enter().append("tspan")
      .attr("x", 4)
      .attr("y", function(d, i) { return 13 + i * 10; })
      .text(function(d) { return d; });
​
  cell.append("title")
      .text(function(d) { return d.data.id + "\n" + format(d.value); });
​
  d3.selectAll("input")
      .data([sumBySize, sumByCount], function(d) { return d ? d.name : this.value; })
      .on("change", changed);
​
  var timeout = d3.timeout(function() {
    d3.select("input[value=\"sumByCount\"]")
        .property("checked", true)
        .dispatch("change");
  }, 2000);
​
  function changed(sum) {
    timeout.stop();
​
    treemap(root.sum(sum));
​
    cell.transition()
        .duration(750)
        .attr("transform", function(d) { return "translate(" + d.x0 + "," + d.y0 + ")"; })
      .select("rect")
        .attr("width", function(d) { return d.x1 - d.x0; })
        .attr("height", function(d) { return d.y1 - d.y0; });
  }
});
​
function sumByCount(d) {
  return d.children ? 0 : 4;
}
​
function sumBySize(d) {
  return d.size;
}
​
</script>
​
    