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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| { | |
| "name": "flare", | |
| "children": [ | |
| {"name": "School type 1", "size": 3938}, | |
| {"name": "School type 2", "size": 3812}, | |
| {"name": "School type 3", "size": 6714}, | |
| {"name": "School type 4", "size": 743} | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; | |
| margin: auto; | |
| position: relative; | |
| width: 960px; | |
| } | |
| form { | |
| position: absolute; | |
| right: 10px; | |
| top: 10px; | |
| } | |
| .node { | |
| border: solid 1px white; | |
| font: 10px sans-serif; | |
| line-height: 12px; | |
| overflow: hidden; | |
| position: absolute; | |
| text-indent: 2px; | |
| } | |
| </style> | |
| <form> | |
| <label><input type="radio" name="mode" value="size" checked> Size</label> | |
| <label><input type="radio" name="mode" value="count"> Count</label> | |
| </form> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = {top: 40, right: 10, bottom: 10, left: 10}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var color = d3.scale.category10(); | |
| var treemap = d3.layout.treemap() | |
| .size([width, height]) | |
| .sticky(true) | |
| .value(function(d) { return d.size; }); | |
| var div = d3.select("body").append("div") | |
| .style("position", "relative") | |
| .style("width", (width + margin.left + margin.right) + "px") | |
| .style("height", (height + margin.top + margin.bottom) + "px") | |
| .style("left", margin.left + "px") | |
| .style("top", margin.top + "px"); | |
| d3.json("flare.json", function(error, root) { | |
| var node = div.datum(root).selectAll(".node") | |
| .data(treemap.nodes) | |
| .enter().append("div") | |
| .attr("class", "node") | |
| .call(position) | |
| .style("background", function(d) { return d.children ? color(d.name) : null; }) | |
| .text(function(d) { return d.children ? null : d.name; }); | |
| d3.selectAll("input").on("change", function change() { | |
| var value = this.value === "count" | |
| ? function() { return 1; } | |
| : function(d) { return d.size; }; | |
| node | |
| .data(treemap.value(value).nodes) | |
| .transition() | |
| .duration(1500) | |
| .call(position); | |
| }); | |
| }); | |
| function position() { | |
| this.style("left", function(d) { return d.x + "px"; }) | |
| .style("top", function(d) { return d.y + "px"; }) | |
| .style("width", function(d) { return Math.max(0, d.dx - 1) + "px"; }) | |
| .style("height", function(d) { return Math.max(0, d.dy - 1) + "px"; }); | |
| } | |
| </script> |
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