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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