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<!DOCTYPE html> | |
<html> | |
<head> | |
<title>Force-Directed Layout (Multiple Foci)</title> | |
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script> | |
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js"></script> | |
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js"></script> | |
</head> | |
<body> | |
<script type="text/javascript"> | |
var w = 960, | |
h = 500, | |
fill = d3.scale.category10(), | |
nodes = [], | |
foci = [{x: 150, y: 150}, {x: 350, y: 250}, {x: 700, y: 400}]; | |
var vis = d3.select("body").append("svg:svg") | |
.attr("width", w) | |
.attr("height", h); | |
var force = d3.layout.force() | |
.nodes(nodes) | |
.links([]) | |
.gravity(0) | |
.size([w, h]); | |
force.on("tick", function(e) { | |
// Push nodes toward their designated focus. | |
var k = .1 * e.alpha; | |
nodes.forEach(function(o, i) { | |
o.y += (foci[o.id].y - o.y) * k; | |
o.x += (foci[o.id].x - o.x) * k; | |
}); | |
vis.selectAll("circle.node") | |
.attr("cx", function(d) { return d.x; }) | |
.attr("cy", function(d) { return d.y; }); | |
}); | |
setInterval(function(){ | |
nodes.push({id: ~~(Math.random() * foci.length)}); | |
force.start(); | |
vis.selectAll("circle.node") | |
.data(nodes) | |
.enter().append("svg:circle") | |
.attr("class", "node") | |
.attr("cx", function(d) { return d.x; }) | |
.attr("cy", function(d) { return d.y; }) | |
.attr("r", 8) | |
.style("fill", function(d) { return fill(d.id); }) | |
.style("stroke", function(d) { return d3.rgb(fill(d.id)).darker(2); }) | |
.style("stroke-width", 1.5) | |
.call(force.drag); | |
}, 1000); | |
</script> | |
</body> | |
</html> |
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