Example of d3.layout.forceInABox

An implementation of d3.layout.forceInABox which implements a method to separate nodes in a network visually based on some kind of group membership.

In this case, the group is the community membership of the node as determined by Louvain modularity using jLouvain.js.

<html>
<head>
  <title>Community Grid</title>
  <meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.16/d3.min.js" charset="utf-8" type="text/javascript"></script>
<script src="jsLouvain.js" type="text/JavaScript"></script>
<script src="forceInABox.js" type="text/JavaScript"></script>
</head>
<style>
  svg {
    height: 500px;
    width: 500px;
    border: 1px solid gray;
  }
</style>
<body>

d3.csv("firm.csv",function(error,data) {createNetwork(data)});

function onlyUnique(value, index, self) {
  return self.indexOf(value) === index;
}

function createNetwork(edgelist) {
  var nodeHash = {};
  var nodes = [];
  var edges = [];

edgelist.forEach(function (edge) {
    if (!nodeHash[edge.source]) {
      nodeHash[edge.source] = {id: edge.source, label: edge.source};
      nodes.push(nodeHash[edge.source]);
    }
    if (!nodeHash[edge.target]) {
      nodeHash[edge.target] = {id: edge.target, label: edge.target};
      nodes.push(nodeHash[edge.target]);
    }
    if (edge.weight == 5) {
      edges.push({id: nodeHash[edge.source].id + "-" + nodeHash[edge.target].id, source: nodeHash[edge.source], target: nodeHash[edge.target], weight: edge.weight});
    }
  });
  createForceNetwork(nodes, edges);
}

function createForceNetwork(nodes, edges) {

//create a network from an edgelist

var colors = d3.scale.ordinal().domain([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]).range(["#996666", "#66CCCC", "#FFFF99", "#CC9999", "#666633", "#993300", "#999966", "#660000", "#996699", "#cc6633", "#ff9966", "#339999", "#6699cc", "#ffcc66", "#ff6600", "#00ccccc"]);

var node_data = nodes.map(function (d) {return d.id});
var edge_data = edges.map(function (d) {return {source: d.source.id, target: d.target.id, weight: 1}; });

var community = jLouvain().nodes(node_data).edges(edge_data);
var result  = community();

nodes.forEach(function (node) {
  node.module = result[node.id]
});

var force = d3.layout.forceInABox()
    .charge(-120)
    .linkDistance(50)
    .linkStrengthInterCluster(0.01)
    .gravityToFoci(0.2)
    .gravityOverall(0.05)
    .size([500, 500])
    .groupBy(function (d) {return d.module});

force
    .nodes(nodes)
    .links(edges)
    .on("tick", updateGraph);

var edgeEnter = d3.select("svg.main").selectAll("g.edge")
  .data(edges, function (d) {return d.id})
  .enter()
  .append("g")
  .attr("class", "edge");

edgeEnter
  .append("line")
  .style("stroke-width", "1px")
  .style("stroke", "black")
  .style("pointer-events", "none");

var nodeEnter = d3.select("svg.main")
  .selectAll("g.node")
  .data(nodes, function (d) {return d.id})
  .enter()
  .append("g")
  .attr("class", "node")
  .call(force.drag());

nodeEnter.append("circle")
  .attr("r", 8)
  .style("fill", function (d) {return colors(d.module)})
  .style("stroke", "black")
  .style("stroke-width", "1px")

nodeEnter.append("text")
  .style("text-anchor", "middle")
  .attr("y", 3)
  .style("stroke-width", "1px")
  .style("stroke-opacity", 0.75)
  .style("stroke", "white")
  .style("font-size", "8px")
  .text(function (d) {return d.id})
  .style("pointer-events", "none")

nodeEnter.append("text")
  .style("text-anchor", "middle")
  .attr("y", 3)
  .style("font-size", "8px")
  .text(function (d) {return d.id})
  .style("pointer-events", "none")

force.start();

function updateGraph(e) {
  force.onTick(e);

d3.selectAll("line")
    .attr("x1", function(d) { return d.source.x; })
    .attr("y1", function(d) { return d.source.y; })
    .attr("x2", function(d) { return d.target.x; })
    .attr("y2", function(d) { return d.target.y; });

d3.selectAll("g.node")
    .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
}

}
</script>
  </footer>

</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.16/d3.min.js