Force-layout of Cable2Graph

Update: This prototype has turned into a bigger project: http://is.gd/CableWeaver

Here's a small gallery of Cable2Graph cable reference culsters (the graphs are named after countries, but they don't "represent" the entire body of cables related to them. It's just a handy naming convention). Each node (circle) represents a cable. Each link (line) represents reference between 2 cables.

Instructions

Hover over a node to see details of the cable it represents.
Click on a node to open the related cable in a new tab.
Shift+click on the node to toggle between manual placement and auto placement modes (see below). Default is auto placement.
When you drag a node, all nodes in auto placement mode rearrange themselves as if the links were "rubber bands".
When you release a node that is in auto placement mode, it snaps into place according to the "rubber bands" attached to it. This is why it is usually best to switch a node to manual placement before dragging it.

Reaching a readable layout (where all arrows are visible and distinguishable) can take up to 20 minutes depending on the graph (Syria and Jordan are the most complex, Iran is easy). Here's a screenshot gallery of all graphs after tidying them up a bit.

Legend

Node's fill color represents sending Embassy.
Border is dashed if cable is missing, otherwise the color represents classification (UNCLASSIFIED, CONFIDENTIAL, and SECRET).
Border is darker when node is in manual placement mode.
Border width represents node's HITS authority (how "strongly" it is involved in [in]direct reference).
Link arrowhead points to the referenced (i.e. earlier) cable.
Link width represents [betweenness centrality](The color represents the embassy send://en.wikipedia.org/wiki/Betweenness_centrality) of the reference (in how many shortest-paths between pairs of cables it appears).

Under the hood

This is a proof of concept: trying to use d3 force-layout to render WikiLeaks Cable2Graph clusters. Hopefully, this will become a public web service with a server-side component generating the graphs on demand.
If you fork this, bear in mind that the json file contains additional information you may wish to visualize (e.g. pagerank).
If you want to try this with your own nbh/splitgrraph graphml files, you can convert them with g2json - a minimalistic fork of g2svg (included in this gist).

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.menu, .menu li { display: inline; padding:0 4px }
.menu a { text-decoration: none }
.menu a hover { text-decoration: underline }
.menu a.active { color: black; font-weight: bold }

.node {
  stroke: #000;
  stroke-width: 1.5px;
  stroke-opacity: .6;
}

.node.MISSING { stroke:#black; stroke-dasharray:2,2 }
.node.SECRET-NOFORN { stroke: #7f0000; }
.node.SECRET { stroke: #7f0000; }
.node.CONFIDENTIAL-NOFORN { stroke: #00007f; }
.node.CONFIDENTIAL { stroke: #00007f; }
.node.UNCLASSIFIED { stroke: #007f00; }
.node.UNCLASSIFIED-FOR-OFFICIAL-USE-ONLY { stroke: #007f00; }

.node.active {
  stroke-opacity: 1;
}

.link {
  stroke: #000;
  stroke-opacity: .6;
}

</style>
<body>
<div id="header">
  Example <a target="_blank" href="https://wlwardiary.github.com/cable2graph/">Cable2Graph</a>
  clusters (please see instructions):
</div>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

// Helper so that a link doesn't cover the nodes
// returns a line between x1,x2 and y1,y2 that is
// begins r1 "later" and ends r2 "earlier"
// is there a fancy d3 way to do this?!?
function shorten(x1,y1,x2,y2,r1,r2) {
    if (x1==y1 && x2==y2)
        return {x1:x1,x2:x2,y1:y1,y2:y2};
    a = Math.atan(Math.abs(y2-y1)/Math.abs(x2-x1)); // atan can swallow Infinity
    return {
      x1:x1+(x2>x1?1:-1)*r1*Math.cos(a),
      y1:y1+(y2>y1?1:-1)*r1*Math.sin(a),
      x2:x2+(x2>x1?-1:1)*r2*Math.cos(a),
      y2:y2+(y2>y1?-1:1)*r2*Math.sin(a)
    }
}

var menu = [
 {name:"Iran",file:"iran.json"},
 {name:"Ireland",file:"ireland.json"},
 {name:"Jordan",file:"jordan.json"},
 {name:"Palestine",file:"palestine.json"},
 {name:"Spain",file:"spain.json"},
 {name:"Syria",file:"syria.json"}
]

d3.select("#header")
    .append("ul").attr("class","menu")
     
    .selectAll("li")
      .data(menu)
    .enter().append("li")
      .append("a").attr("href", "#")
        .attr("id", function(d) { return d.name; })
        .attr("class", "menu-item")
        .text(function(d) { return d.name })
        .on("click", function(d) { populate(d.name,d.file); return false; })

var width = 960,
    height = 480;

var node_color = d3.scale.category20().domain(d3.range(0,1000));

var force = d3.layout.force()
    .charge(-100)
    .linkDistance(30)
    .size([width, height]);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

svg.append("svg:defs")
  .append("svg:marker")
    .attr("id","arrow-head").attr("viewBox", "0 0 10 10")
    .attr("refX", 1).attr("refY", 5)
    .attr("markerWidth", 4).attr("markerHeight", 3)
    .attr("markerUnit", "strokeWidth").attr("orient", "auto")
    .append("svg:polyline")
      .style("fill","#000")
      .attr("points", "0,0 5,5 0,10 1,5");

populate("Palestine","palestine.json")
</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js