<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Node-Link Tree</title>
<script type="text/javascript" src="../../d3.js"></script>
<script type="text/javascript" src="../../d3.layout.js"></script>
<style type="text/css">
.node {
stroke: #fff;
stroke-width: 2px;
}
.link {
fill: none;
stroke: #000;
}
</style>
</head>
<body>
<script type="text/javascript">
var w = 960,
h = 500,
root = {},
data = [root],
tree = d3.layout.tree().size([w - 20, h - 20]),
diagonal = d3.svg.diagonal(),
duration = 750,
timer = setInterval(update, duration);
var vis = d3.select("body").append("svg:svg")
.attr("width", w)
.attr("height", h)
.append("svg:g")
.attr("transform", "translate(10, 10)");
vis.selectAll("circle")
.data(tree(root))
.enter().append("svg:circle")
.attr("class", "node")
.attr("r", 3.5)
.attr("cx", x)
.attr("cy", y);
function update() {
if (data.length >= 500) return clearInterval(timer);
// Add a new datum to a random parent.
var d = {id: data.length}, parent = data[~~(Math.random() * data.length)];
if (parent.children) parent.children.push(d); else parent.children = [d];
data.push(d);
// Compute the new tree layout. We'll stash the old layout in the data.
var nodes = tree.nodes(root);
// Update the nodes…
var node = vis.selectAll("circle.node")
.data(nodes, function(d) { return d.id; });
// Enter any new nodes at the parent's previous position.
node.enter().append("svg:circle")
.attr("class", "node")
.attr("r", 3.5)
.attr("cx", function(d) { return d.parent.x0; })
.attr("cy", function(d) { return d.parent.y0; })
.transition()
.duration(duration)
.attr("cx", x)
.attr("cy", y);
// Transition nodes to their new position.
node.transition()
.duration(duration)
.attr("cx", x)
.attr("cy", y);
// Update the links…
var link = vis.selectAll("path.link")
.data(tree.links(nodes), function(d) { return d.target.id; });
// Enter any new links at the parent's previous position.
link.enter().insert("svg:path", "circle")
.attr("class", "link")
.attr("d", function(d) {
var o = {x: d.source.x0, y: d.source.y0};
return diagonal({source: o, target: o});
})
.transition()
.duration(duration)
.attr("d", diagonal);
// Transition links to their new position.
link.transition()
.duration(duration)
.attr("d", diagonal);
}
function x(d) {
return d.x0 = d.x;
}
function y(d) {
return d.y0 = d.y;
}
</script>
</body>
</html>