Created
July 19, 2013 15:42
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The purpose of this script is to provide an easy way to create a force directed graph in D3.js without having to know ahead of time the index of the nodes in the Nodes array. Instead of providing a list of Links with the array index of source and target, each node should have a unique name (ID), and each link should reference that. Links to unsu…
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .node { | |
| stroke: #fff; | |
| stroke-width: 0px; | |
| } | |
| .link { | |
| stroke: #ccc; | |
| stroke-opacity: .6; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.js"></script> | |
| <script> | |
| var width = 1200, | |
| height = 800; | |
| var color = d3.scale.category20(); | |
| var force = d3.layout.force() | |
| .charge(-120) | |
| .gravity(1) | |
| .friction(.5) | |
| .linkDistance(30) | |
| .size([width, height]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var nodes, reversenodes = {}, remaining=2; | |
| // Nodes should have ID value | |
| d3.json("nodes.json", function(error,input){ | |
| for(var i=0;i<input.length;i++){ | |
| var node_id = input[i].ID; | |
| reversenodes[node_id] = i; | |
| } | |
| nodes = input; | |
| if (error) { return console.warn(error); } | |
| if (!--remaining) drawChart(); | |
| }); | |
| // To Do: more flexible scale handling | |
| var radius = d3.scale.log().domain([1,1000]).range([2,40]); | |
| // Links should have source and target values with Node ID params | |
| d3.json("links.json", function(error,input){ | |
| var links = new Array(); | |
| for(var i=0;i<input.length;i++){ | |
| if( isNaN(reversenodes[input[i].source]) || isNaN(reversenodes[input[i].target])) { | |
| //console.warn("NaN!"); | |
| } else { | |
| links.push({"source":reversenodes[input[i].source], "target":reversenodes[input[i].target]}); | |
| } | |
| } | |
| //console.warn(links); | |
| if (error) return console.warn(error); | |
| if (!--remaining) drawChart(links); | |
| }); | |
| //console.warn(links); | |
| function drawChart(e) { | |
| force | |
| .nodes(nodes) | |
| .links(e) | |
| .start(); | |
| var link = svg.selectAll(".link") | |
| .data(e) | |
| .enter().append("line") | |
| .attr("class", "link") | |
| .style("stroke-width", 1); | |
| var node = svg.selectAll(".node") | |
| .data(nodes) | |
| .enter().append("circle") | |
| .attr("class", "node") | |
| .attr("cx",function() {return width/2;}) | |
| .attr("cy",function() {return height/2;}) | |
| .attr("r", function(d,i) {return radius(d.linksin);}) | |
| .style("fill", function(d) { return color(d); }); | |
| node.append("title") | |
| .text(function(d) { return d.Title; }); | |
| force.on("tick", function() { | |
| link.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; }); | |
| node.attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }); | |
| }); | |
| } | |
| </script> | |
| </body> |
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