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Created July 15, 2012 12:54
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d3.js: collision detection
Raw
.gitignore
# Editor backup files
*.bak
*~
Raw
index.html
<!DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<head>
<script src="http://d3js.org/d3.v2.js"></script>
<link type="text/css" rel="stylesheet" href="style000.css">
<style type="text/css">
circle {
stroke: #000;
stroke-opacity: .5;
}
</style>
</head>
<body>
<div id="body">
<div id="footer">
Collision Detection
<div class="hint">move the mouse to repel nodes</div>
</div>
</div>
<script type="text/javascript">
var w = 1280,
h = 800;
var nodes = d3.range(200).map(function() { return {radius: Math.random() * 12 + 4}; }),
color = d3.scale.category10();
var force = d3.layout.force()
.gravity(0.05)
.charge(function(d, i) { return i ? 0 : -2000; })
.nodes(nodes)
.size([w, h]);
var root = nodes[0];
root.radius = 0;
root.fixed = true;
force.start();
var svg = d3.select("#body").append("svg:svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("circle")
.data(nodes.slice(1))
.enter().append("svg:circle")
.attr("r", function(d) { return d.radius - 2; })
.style("fill", function(d, i) { return color(i % 3); });
force.on("tick", function(e) {
var q = d3.geom.quadtree(nodes),
i = 0,
n = nodes.length;
while (++i < n) {
q.visit(collide(nodes[i]));
}
svg.selectAll("circle")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
svg.on("mousemove", function() {
var p1 = d3.svg.mouse(this);
root.px = p1[0];
root.py = p1[1];
force.resume();
});
function collide(node) {
var r = node.radius + 16,
nx1 = node.x - r,
nx2 = node.x + r,
ny1 = node.y - r,
ny2 = node.y + r;
return function(quad, x1, y1, x2, y2) {
if (quad.point && (quad.point !== node)) {
var x = node.x - quad.point.x,
y = node.y - quad.point.y,
l = Math.sqrt(x * x + y * y),
r = node.radius + quad.point.radius;
if (l < r) {
l = (l - r) / l * .5;
node.x -= x *= l;
node.y -= y *= l;
quad.point.x += x;
quad.point.y += y;
}
}
return x1 > nx2
|| x2 < nx1
|| y1 > ny2
|| y2 < ny1;
};
}
</script>
</body>
</html>
<!-- This document saved from http://mbostock.github.com/d3/talk/20111018/collision.html -->
Raw
style000.css
body {
overflow: hidden;
margin: 0;
font-size: 14px;
font-family: "Helvetica Neue", Helvetica;
}
#chart, #header, #footer {
position: absolute;
top: 0;
}
#header, #footer {
z-index: 1;
display: block;
font-size: 36px;
font-weight: 300;
text-shadow: 0 1px 0 #fff;
}
#header.inverted, #footer.inverted {
color: #fff;
text-shadow: 0 1px 4px #000;
}
#header {
top: 80px;
left: 140px;
width: 1000px;
}
#footer {
top: 680px;
right: 140px;
text-align: right;
}
rect {
fill: none;
pointer-events: all;
}
pre {
font-size: 18px;
}
line {
stroke: #000;
stroke-width: 1.5px;
}
.string, .regexp {
color: #f39;
}
.keyword {
color: #00c;
}
.comment {
color: #777;
font-style: oblique;
}
.number {
color: #369;
}
.class, .special {
color: #1181B8;
}
a:link, a:visited {
color: #000;
text-decoration: none;
}
a:hover {
color: #666;
}
.hint {
position: absolute;
right: 0;
width: 1280px;
font-size: 12px;
color: #999;
}
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