A reference example for implementing treemaps in D3.js, showing the flare software package hierarchy.
This example is intentionally basic, and it lacks many important features such as labels or interaction.
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August 29, 2015 14:06
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Basic treemap (flare)
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| # layout, behaviors and scales | |
| SCALE = 400 | |
| PADDING = 8 | |
| TIP = 10 | |
| treemap = d3.layout.treemap() | |
| .size([SCALE, SCALE]) | |
| .value((node) -> node.size) | |
| svg = d3.select('svg') | |
| width = svg.node().getBoundingClientRect().width | |
| height = svg.node().getBoundingClientRect().height | |
| # translate the viewBox to have (0,0) at the center of the vis | |
| svg | |
| .attr | |
| viewBox: "#{-width/2} #{-height/2} #{width} #{height}" | |
| # append a group for zoomable content | |
| zoomable_layer = svg.append('g') | |
| # define a zoom behavior | |
| zoom = d3.behavior.zoom() | |
| .scaleExtent([1,10]) # min-max zoom | |
| .on 'zoom', () -> | |
| # GEOMETRIC ZOOM | |
| zoomable_layer | |
| .attr | |
| transform: "translate(#{zoom.translate()})scale(#{zoom.scale()})" | |
| # bind the zoom behavior to the main SVG | |
| svg.call(zoom) | |
| # group the visualization | |
| vis = zoomable_layer.append('g') | |
| .attr | |
| transform: "translate(#{-SCALE/2},#{-SCALE/2})" | |
| d3.json 'http://wafi.iit.cnr.it/webvis/tmp/flare.json', (tree) -> | |
| nodes_data = treemap.nodes(tree) | |
| nodes = vis.selectAll('.node') | |
| .data(nodes_data) | |
| enter_nodes = nodes.enter().insert('rect','rect') | |
| .attr | |
| class: 'node' | |
| x: (node) -> node.x | |
| y: (node) -> node.y | |
| width: (node) -> node.dx | |
| height: (node) -> node.dy | |
| stroke: (node) -> | |
| switch node.depth | |
| when 0 then '#333' | |
| when 1 then '#999' | |
| else '#DDD' | |
| 'stroke-width': (node) -> | |
| switch node.depth | |
| when 0 then 3 | |
| when 1 then 2 | |
| else 1 | |
| enter_nodes.append('title') | |
| .text((node) -> node.name) | |
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| svg { | |
| background: white; | |
| } | |
| .node { | |
| shape-rendering: crispEdges; | |
| vector-effect: non-scaling-stroke; | |
| fill: none; | |
| } | |
| .label { | |
| text-anchor: middle; | |
| font-family: sans-serif; | |
| /*text-shadow: -1px 0 white, 0 1px white, 1px 0 white, 0 -1px white;*/ | |
| text-shadow: -2px 0 white, 0 2px white, 2px 0 white, 0 -2px white, -1px -1px white, 1px -1px white, 1px 1px white, -1px 1px white; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="description" content="Basic treemap (flare)" /> | |
| <title>Basic treemap (flare)</title> | |
| <link type="text/css" href="index.css" rel="stylesheet"/> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| </head> | |
| <body> | |
| <svg height="500" width="960"></svg> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| (function() { | |
| var PADDING, SCALE, TIP, height, svg, treemap, vis, width, zoom, zoomable_layer; | |
| SCALE = 400; | |
| PADDING = 8; | |
| TIP = 10; | |
| treemap = d3.layout.treemap().size([SCALE, SCALE]).value(function(node) { | |
| return node.size; | |
| }); | |
| svg = d3.select('svg'); | |
| width = svg.node().getBoundingClientRect().width; | |
| height = svg.node().getBoundingClientRect().height; | |
| svg.attr({ | |
| viewBox: "" + (-width / 2) + " " + (-height / 2) + " " + width + " " + height | |
| }); | |
| zoomable_layer = svg.append('g'); | |
| zoom = d3.behavior.zoom().scaleExtent([1, 10]).on('zoom', function() { | |
| return zoomable_layer.attr({ | |
| transform: "translate(" + (zoom.translate()) + ")scale(" + (zoom.scale()) + ")" | |
| }); | |
| }); | |
| svg.call(zoom); | |
| vis = zoomable_layer.append('g').attr({ | |
| transform: "translate(" + (-SCALE / 2) + "," + (-SCALE / 2) + ")" | |
| }); | |
| d3.json('http://wafi.iit.cnr.it/webvis/tmp/flare.json', function(tree) { | |
| var enter_nodes, nodes, nodes_data; | |
| nodes_data = treemap.nodes(tree); | |
| nodes = vis.selectAll('.node').data(nodes_data); | |
| enter_nodes = nodes.enter().insert('rect', 'rect').attr({ | |
| "class": 'node', | |
| x: function(node) { | |
| return node.x; | |
| }, | |
| y: function(node) { | |
| return node.y; | |
| }, | |
| width: function(node) { | |
| return node.dx; | |
| }, | |
| height: function(node) { | |
| return node.dy; | |
| }, | |
| stroke: function(node) { | |
| switch (node.depth) { | |
| case 0: | |
| return '#333'; | |
| case 1: | |
| return '#999'; | |
| default: | |
| return '#DDD'; | |
| } | |
| }, | |
| 'stroke-width': function(node) { | |
| switch (node.depth) { | |
| case 0: | |
| return 3; | |
| case 1: | |
| return 2; | |
| default: | |
| return 1; | |
| } | |
| } | |
| }); | |
| return enter_nodes.append('title').text(function(node) { | |
| return node.name; | |
| }); | |
| }); | |
| }).call(this); |
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