Started with examples from blocks like: cluster force, Collision Detection
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January 26, 2017 18:37
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clusters force
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<svg width="960" height="700"></svg> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script> | |
var svg = d3.select("svg"), | |
width = +svg.attr("width"), | |
height = +svg.attr("height"), | |
padding = 1.5; | |
var n = 300, // nodes | |
m = 3; // clusters | |
var colorRange1 = ['#9BB0DB', '#708DC8', '#486CB4'], | |
colorRange2 = ['#D7A1C9', '#B06FAE', '#AC53A0'], | |
colorRange3 = ['#F6A4BF', '#EF77A0', '#EB4F83']; | |
var color1 = d3.scaleLinear().range(colorRange1).domain([-1, 0, 1]), | |
color2 = d3.scaleLinear().range(colorRange2).domain([-1, 0, 1]), | |
color3 = d3.scaleLinear().range(colorRange3).domain([-1, 0, 1]); | |
var radialGradient1 = svg.append("defs") | |
.append("radialGradient") | |
.attr("id", "radial-gradient1"); | |
radialGradient1.append("stop") | |
.attr("offset", "0%") | |
.attr("stop-color", color1(-1)); | |
radialGradient1.append("stop") | |
.attr("offset", "50%") | |
.attr("stop-color", color1(0)); | |
radialGradient1.append("stop") | |
.attr("offset", "100%") | |
.attr("stop-color", color1(1)); | |
var radialGradient2 = svg.append("defs") | |
.append("radialGradient") | |
.attr("id", "radial-gradient2"); | |
radialGradient2.append("stop") | |
.attr("offset", "0%") | |
.attr("stop-color", color2(-1)); | |
radialGradient2.append("stop") | |
.attr("offset", "50%") | |
.attr("stop-color", color2(0)); | |
radialGradient2.append("stop") | |
.attr("offset", "100%") | |
.attr("stop-color", color2(1)); | |
var radialGradient3 = svg.append("defs") | |
.append("radialGradient") | |
.attr("id", "radial-gradient3"); | |
radialGradient3.append("stop") | |
.attr("offset", "0%") | |
.attr("stop-color", color3(-1)); | |
radialGradient3.append("stop") | |
.attr("offset", "50%") | |
.attr("stop-color", color3(0)); | |
radialGradient3.append("stop") | |
.attr("offset", "100%") | |
.attr("stop-color", color3(1)); | |
var clusters = new Array(m); | |
var nodes = d3.range(n).map(function () { | |
var i = Math.floor(Math.random() * m+1), | |
r = Math.random() * 15 + 5, | |
d = { | |
cluster: i, | |
radius: Math.random() * 15 + 5, | |
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 force = d3.forceSimulation() | |
.force('center', d3.forceCenter(width / 2, height / 2)) | |
.force('cluster', cluster() | |
.strength(0.2)) | |
// apply collision with padding | |
.force('collide', d3.forceCollide(d => d.radius + padding) | |
.strength(0.7)) | |
.on('tick', layoutTick) | |
.nodes(nodes); | |
var node = svg.selectAll("circle") | |
.data(nodes) | |
.enter().append("circle") | |
.attr("r", function (d) { return d.radius; }) | |
.style("fill", function (d) { | |
if (d.cluster== 1) { return "url(#radial-gradient1)"; } | |
else {if (d.cluster == 2) { return "url(#radial-gradient2)"; } | |
else { return "url(#radial-gradient3)"; } | |
} | |
}); | |
function layoutTick() { | |
node | |
.attr("cx", function (d) { return d.x; }) | |
.attr("cy", function (d) { return d.y; }) | |
} | |
// Move d to be adjacent to the cluster node. | |
// from: https://bl.ocks.org/mbostock/7881887 | |
function cluster() { | |
var nodes, | |
strength = 0.1; | |
function force(alpha) { | |
// scale + curve alpha value | |
alpha *= strength * alpha; | |
nodes.forEach(function (d) { | |
var cluster = clusters[d.cluster]; | |
if (cluster === d) return; | |
let x = d.x - cluster.x, | |
y = d.y - cluster.y, | |
l = Math.sqrt(x * x + y * y), | |
r = d.radius + cluster.radius; | |
if (l != r) { | |
l = (l - r) / l * alpha; | |
d.x -= x *= l; | |
d.y -= y *= l; | |
cluster.x += x; | |
cluster.y += y; | |
} | |
}); | |
} | |
force.initialize = function (_) { | |
nodes = _; | |
} | |
force.strength = _ => { | |
strength = _ == null ? strength : _; | |
return force; | |
}; | |
return force; | |
} | |
</script> |
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