Some force-directed points, with the Urquhart graph overlaid. Thanks @enjalot for the idea and time wasted :)
In another variant I toss in some Brownian motion.
Forked from erlenstar's block: Delaunay Force Mesh II
Last active
November 17, 2016 15:29
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Urquhart Force Mesh
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="//d3js.org/d3.v4.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| τ = 2 * Math.PI, | |
| maxLength = 10000, | |
| maxLength2 = maxLength * maxLength; | |
| var nodes = d3.range(200).map(function() { | |
| return { | |
| x: Math.random() * width, | |
| y: Math.random() * height | |
| }; | |
| }); | |
| var force = d3.forceSimulation() | |
| .nodes(nodes.slice()) | |
| .force("link", d3.forceLink().id(function(d) { return d.id; })) | |
| .force("charge", d3.forceManyBody().strength(function(d,i){ | |
| return i ? -25 : -1000 | |
| })) | |
| .force("x", d3.forceX()) | |
| .force("y", d3.forceY()) | |
| .force("center", d3.forceCenter(width / 2, height / 2)) | |
| .on("tick", ticked); | |
| var voronoi = d3.voronoi() | |
| .x(function(d) { return d.x; }) | |
| .y(function(d) { return d.y; }); | |
| var canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("ontouchstart" in document ? "touchmove" : "mousemove", moved); | |
| var context = canvas.node().getContext("2d"); | |
| function moved() { | |
| var p1 = d3.mouse(this); | |
| nodes[0].fx = p1[0]; | |
| nodes[0].fy = p1[1]; | |
| force.alpha(0.1).restart(); | |
| } | |
| function urquhart(diagram){ | |
| var urquhart = d3.map(); | |
| diagram.links() | |
| .forEach(function(link) { | |
| var v = d3.extent([link.source.index, link.target.index]); | |
| urquhart.set(v, link); | |
| }); | |
| urquhart._remove = []; | |
| diagram.triangles() | |
| .forEach(function(t) { | |
| var l = 0, length = 0, i="bleh", v; | |
| for (var j=0; j<3; j++) { | |
| var a = t[j], b = t[(j+1)%3]; | |
| v = d3.extent([a.index, b.index]); | |
| length = (a.x-b.x) * (a.x-b.x) + (a.y-b.y) * (a.y-b.y); | |
| if (length > l) { | |
| l = length; | |
| i = v; | |
| } | |
| } | |
| urquhart._remove.push(i); | |
| }); | |
| //console.log(JSON.stringify(urquhart._remove)) | |
| urquhart._remove.forEach(function(i) { | |
| if (urquhart.has(i)) urquhart.remove(i); | |
| }); | |
| return urquhart.values(); | |
| } | |
| function ticked() { | |
| var diagram = voronoi(nodes); | |
| //var links = diagram.links(); | |
| var links = urquhart(diagram); | |
| context.clearRect(0, 0, width, height); | |
| context.beginPath(); | |
| for (var i = 0, n = links.length; i < n; ++i) { | |
| var link = links[i], | |
| dx = link.source.x - link.target.x, | |
| dy = link.source.y - link.target.y; | |
| if (dx * dx + dy * dy < maxLength2) { | |
| context.moveTo(link.source.x, link.source.y); | |
| context.lineTo(link.target.x, link.target.y); | |
| } | |
| } | |
| context.lineWidth = 1; | |
| context.strokeStyle = "#bbb"; | |
| context.stroke(); | |
| context.beginPath(); | |
| for (var i = 0, n = nodes.length; i < n; ++i) { | |
| var node = nodes[i]; | |
| context.moveTo(node.x, node.y); | |
| context.arc(node.x, node.y, 2, 0, τ); | |
| } | |
| context.lineWidth = 3; | |
| context.strokeStyle = "#fff"; | |
| context.stroke(); | |
| context.fillStyle = "#000"; | |
| context.fill(); | |
| } | |
| </script> |
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