Graph Rollup by mbostock

index.html

<!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>

d3.rollup.min.js

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};

social.json

{
  "nodes": [
    {"gender": "M", "group": "Boston"},
    {"gender": "F", "group": "San Francisco"},
    {"gender": "M", "group": "Boston"},
    {"gender": "M", "group": "San Francisco"},
    {"gender": "F", "group": "San Francisco"},
    {"gender": "M", "group": "Boston"},
    {"gender": "F", "group": "Boston"},
    {"gender": "M", "group": "San Francisco"},
    {"gender": "F", "group": "San Francisco"},
    {"gender": "F", "group": "San Francisco"}
  ],
  "links": [
    {"source": 0, "target": 1},
    {"source": 1, "target": 2},
    {"source": 2, "target": 3},
    {"source": 2, "target": 4},
    {"source": 2, "target": 5},
    {"source": 2, "target": 6},
    {"source": 2, "target": 7},
    {"source": 5, "target": 6},
    {"source": 6, "target": 7},
    {"source": 5, "target": 8},
    {"source": 8, "target": 6},
    {"source": 6, "target": 9}
  ]
}