<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Force-Directed Graph</title>
<script type="text/javascript" src="../../d3.js"></script>
<script type="text/javascript" src="../../d3.geom.js"></script>
<script type="text/javascript" src="../../d3.layout.js"></script>
<style type="text/css">
circle.node {
cursor: pointer;
stroke: #3182bd;
stroke-width: 1.5px;
}
line.link {
fill: none;
stroke: #9ecae1;
stroke-width: 1.5px;
}
</style>
</head>
<body>
<div id="chart"></div>
<script type="text/javascript">
var w = 960,
h = 500,
node,
link,
root;
var force = d3.layout.force()
.on("tick", tick)
.size([w, h]);
var vis = d3.select("#chart").append("svg:svg")
.attr("width", w)
.attr("height", h);
d3.json("../data/flare.json", function(json) {
root = json;
update();
});
function update() {
var nodes = flatten(root),
links = d3.layout.tree().links(nodes);
// Restart the force layout.
force
.nodes(nodes)
.links(links)
.start();
// Update the links…
link = vis.selectAll("line.link")
.data(links, function(d) { return d.target.id; });
// Enter any new links.
link.enter().insert("svg:line", ".node")
.attr("class", "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; });
// Exit any old links.
link.exit().remove();
// Update the nodes…
node = vis.selectAll("circle.node")
.data(nodes, function(d) { return d.id; })
.style("fill", color);
// Enter any new nodes.
node.enter().append("svg:circle")
.attr("class", "node")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", function(d) { return Math.sqrt(d.size) / 10 || 4.5; })
.style("fill", color)
.on("click", click)
.call(force.drag);
// Exit any old nodes.
node.exit().remove();
}
function tick() {
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; });
}
// Color leaf nodes orange, and packages white or blue.
function color(d) {
return d._children ? "#3182bd" : d.children ? "#c6dbef" : "#fd8d3c";
}
// Toggle children on click.
function click(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update();
}
// Returns a list of all nodes under the root.
function flatten(root) {
var nodes = [], i = 0;
function recurse(node) {
if (node.children) node.children.forEach(recurse);
if (!node.id) node.id = ++i;
nodes.push(node);
}
recurse(root);
return nodes;
}
</script>
</body>
</html>