The d3.rollup plugin implements the “PivotGraph” technique for collapsing large graphs along categorical dimensions, as described by Martin Wattenberg in Visual Exploration of Multivariate Graphs.
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<title>PivotGraph (Rollup) Layout</title> | |
<style> | |
body { | |
font-family: sans-serif; | |
font-size: 10px; | |
} | |
.link { | |
fill: none; | |
stroke: #000; | |
stroke-opacity: .25; | |
} | |
.node { | |
fill: #fff; | |
stroke: steelblue; | |
} | |
.axis path, | |
.axis line { | |
display: none; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script src="http://d3js.org/d3.rollup.v0.min.js"></script> | |
<script> | |
var margin = {top: 90, right: 240, bottom: 90, left: 240}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom; | |
function fx(d) { return d.gender; } | |
function fy(d) { return d.group; } | |
var x = d3.scale.ordinal() | |
.rangePoints([6, width - 6]); | |
var y = d3.scale.ordinal() | |
.rangePoints([6, height - 6]); | |
var xAxis = d3.svg.axis() | |
.scale(x) | |
.orient("top"); | |
var yAxis = d3.svg.axis() | |
.scale(y) | |
.orient("left"); | |
var rollup = d3.rollup() | |
.x(function(d) { return x(fx(d)); }) | |
.y(function(d) { return y(fy(d)); }); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width + margin.left + margin.right) | |
.attr("height", height + margin.top + margin.bottom) | |
.append("g") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
d3.json("social.json", function(error, social) { | |
x.domain(social.nodes.map(fx)); | |
y.domain(social.nodes.map(fy)); | |
var graph = rollup(social); | |
svg.selectAll(".link") | |
.data(graph.links) | |
.enter().append("path") | |
.attr("class", "link") | |
.attr("d", function(d) { | |
var sx = d.source.x, sy = d.source.y, | |
tx = d.target.x, ty = d.target.y, | |
dx = tx - sx, dy = ty - sy, | |
dr = 2 * Math.sqrt(dx * dx + dy * dy); | |
return "M" + sx + "," + sy + "A" + dr + "," + dr + " 0 0,1 " + tx + "," + ty; | |
}) | |
.style("stroke-width", function(d) { return d.value * 4; }); | |
svg.selectAll(".node") | |
.data(graph.nodes) | |
.enter().append("circle") | |
.attr("class", "node") | |
.attr("r", function(d) { return Math.sqrt(d.nodes.length * 40); }) | |
.attr("cx", function(d) { return d.x; }) | |
.attr("cy", function(d) { return d.y; }); | |
svg.append("g") | |
.attr("class", "x axis") | |
.call(xAxis); | |
svg.append("g") | |
.attr("class", "y axis") | |
.call(yAxis); | |
}); | |
</script> |
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