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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Graph Rollup
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| license: gpl-3.0 |
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| d3.rollup=function(){function n(n,t){function e(n){return o[n]+","+m[n]}for(var r=f.call(this,n,t),u=g.call(this,n,t),i=r.length,l=u.length,t=-1,o=[],m=[],k=0,v={},p={};i>++t;){(n=r[t]).index=t,o[t]=c.call(this,n,t),m[t]=a.call(this,n,t);var y=e(t),b=v[y];b||(b=v[y]={index:k++,x:o[t],y:m[t],nodes:[]}),b.nodes.push(n)}for(t=-1;l>++t;){var S=d.call(this,n=u[t],t),T=h.call(this,n,t),V=x.call(this,n,t),j=v[e("number"==typeof T?T:T.index)],q=v[e("number"==typeof V?V:V.index)],w=!s&&j.index>q.index?q.index+","+j.index:j.index+","+q.index,z=p[w];z||(z=p[w]={source:j,target:q,value:0,links:[]}),z.links.push(u[t]),z.value+=S}return{nodes:d3.values(v),links:d3.values(p)}}function t(n){return n.x}function e(n){return n.y}function r(n){return n.nodes}function u(n){return n.links}function i(){return 1}function l(n){return n.source}function o(n){return n.target}var s=!0,c=t,a=e,f=r,g=u,d=i,h=l,x=o;return n.x=function(t){return arguments.length?(c=t,n):c},n.y=function(t){return arguments.length?(a=t,n):a},n.nodes=function(t){return arguments.length?(f=t,n):f},n.links=function(t){return arguments.length?(g=t,n):g},n.linkSource=function(t){return arguments.length?(h=t,n):h},n.linkTarget=function(t){return arguments.length?(x=t,n):x},n.linkValue=function(t){return arguments.length?(d=t,n):d},n.directed=function(t){return arguments.length?(s=t,n):s},n}; |
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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="//d3js.org/d3.v3.min.js"></script> | |
| <script src="d3.rollup.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) { | |
| if (error) throw error; | |
| 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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