Ported to v5 as a sanity check while I was debugging another visualization
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Multi-Foci Force Layout
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .node { | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var fill = d3.scaleOrdinal(d3.schemeCategory10); | |
| var nodes = [], | |
| foci = [{x: 150, y: 150}, {x: 350, y: 250}, {x: 700, y: 400}]; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var force = d3.forceSimulation(nodes) | |
| .force('nbody', d3.forceManyBody()) | |
| .force('foci', alpha => { | |
| for (var i = 0, n = nodes.length, o, k = alpha * 0.1; i < n; ++i) { | |
| o = nodes[i]; | |
| o.vx += (foci[o.id].x - o.x) * k; | |
| o.vy += (foci[o.id].y - o.y) * k; | |
| } | |
| }) | |
| .alphaTarget(0.25) | |
| .on("tick", tick); | |
| var node = svg.selectAll("circle"); | |
| function tick(e) { | |
| node | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }); | |
| } | |
| function add() { | |
| nodes.push({ | |
| id: ~~(Math.random() * foci.length), | |
| x: Math.random() * width, | |
| y: Math.random() * height | |
| }); | |
| force.nodes(nodes); | |
| node = svg.selectAll("circle").data(nodes); | |
| node = node.enter().append("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); }) | |
| .merge(node); | |
| } | |
| setInterval(add, 500); | |
| </script> |
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