Example illustrating the use of both d3-force-cluster
and d3-force-attract
, with a dynamic attract target
.
forked from ericsoco's block: d3-force-cluster + d3-force-attract II
license: mit |
Example illustrating the use of both d3-force-cluster
and d3-force-attract
, with a dynamic attract target
.
forked from ericsoco's block: d3-force-cluster + d3-force-attract II
<!DOCTYPE html> | |
<html> | |
<head> | |
<title>d3-force-cluster and d3-force-attract</title> | |
</head> | |
<body> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script src="https://unpkg.com/d3-force-attract@latest"></script> | |
<script src="https://unpkg.com/d3-force-cluster@latest"></script> | |
<script> | |
var width = 960, | |
height = 500, | |
padding = 1.5, // separation between same-color nodes | |
clusterPadding = 6, // separation between different-color nodes | |
maxRadius = 12; | |
var n = 200, // total number of nodes | |
m = 10; // number of distinct clusters | |
var color = d3.scaleSequential(d3.interpolateRainbow) | |
.domain(d3.range(m)); | |
// The largest node for each cluster. | |
var clusters = new Array(m); | |
var nodes = d3.range(n).map(function () { | |
var i = Math.floor(Math.random() * m), | |
r = Math.sqrt((i + 1) / m * -Math.log(Math.random())) * maxRadius, | |
d = { | |
cluster: i, | |
radius: r, | |
x: Math.cos(i / m * 2 * Math.PI) * 200 + width / 2 + Math.random(), | |
y: Math.sin(i / m * 2 * Math.PI) * 200 + height / 2 + Math.random() | |
}; | |
if (!clusters[i] || (r > clusters[i].radius)) clusters[i] = d; | |
return d; | |
}); | |
var maxRad = d3.max(nodes, function (d) { return d.radius; }), | |
maxStrength = 0.25; | |
var simulation = d3.forceSimulation() | |
// pull toward mouse (see 'mousemove' handler below) | |
.force('attract', d3.forceAttract() | |
.target([width/2, height/2]) | |
.strength(function (d) { return Math.pow((d.radius / maxRad) * maxStrength, 2); })) | |
// cluster by section | |
.force('cluster', d3.forceCluster() | |
.centers(function (d) { return clusters[d.cluster]; }) | |
.strength(0.75) | |
.centerInertia(0.1)) | |
// apply collision with padding | |
.force('collide', d3.forceCollide(function (d) { return d.radius + padding; }) | |
.strength(0)) | |
.on('tick', layoutTick) | |
.nodes(nodes); | |
var svg = d3.select('body').append('svg') | |
.attr('width', width) | |
.attr('height', height); | |
var node = svg.selectAll('circle') | |
.data(nodes) | |
.enter().append('circle') | |
.style('fill', function (d) { return color(d.cluster/10); }) | |
.call(d3.drag() | |
.on('start', dragstarted) | |
.on('drag', dragged) | |
.on('end', dragended) | |
); | |
function dragstarted (d) { | |
if (!d3.event.active) simulation.alphaTarget(0.3).restart(); | |
d.fx = d.x; | |
d.fy = d.y; | |
} | |
function dragged (d) { | |
d.fx = d3.event.x; | |
d.fy = d3.event.y; | |
} | |
function dragended (d) { | |
if (!d3.event.active) simulation.alphaTarget(0); | |
d.fx = null; | |
d.fy = null; | |
} | |
svg.on('mousemove', function () { | |
simulation.force('attract').target(d3.mouse(this)); | |
simulation | |
.alphaTarget(0.3) | |
.restart(); | |
}); | |
// ramp up collision strength to provide smooth transition | |
var transitionTime = 3000; | |
var t = d3.timer(function (elapsed) { | |
var dt = elapsed / transitionTime; | |
simulation.force('collide').strength(Math.pow(dt, 2) * 0.7); | |
if (dt >= 1.0) t.stop(); | |
}); | |
function layoutTick (e) { | |
node | |
.attr('cx', function (d) { return d.x; }) | |
.attr('cy', function (d) { return d.y; }) | |
.attr('r', function (d) { return d.radius; }); | |
} | |
</script> | |
</body> | |
</html> |
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