An interactive demonstration of d3-voronoi rendered to SVG. Compare to Canvas.
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April 23, 2023 20:06
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Voronoi Tessellation
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| license: gpl-3.0 | |
| redirect: https://beta.observablehq.com/@mbostock/hover-voronoi |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .links { | |
| stroke: #000; | |
| stroke-opacity: 0.2; | |
| } | |
| .polygons { | |
| fill: none; | |
| stroke: #000; | |
| } | |
| .polygons :first-child { | |
| fill: #f00; | |
| } | |
| .sites { | |
| fill: #000; | |
| stroke: #fff; | |
| } | |
| .sites :first-child { | |
| fill: #fff; | |
| } | |
| </style> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg").on("touchmove mousemove", moved), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var sites = d3.range(100) | |
| .map(function(d) { return [Math.random() * width, Math.random() * height]; }); | |
| var voronoi = d3.voronoi() | |
| .extent([[-1, -1], [width + 1, height + 1]]); | |
| var polygon = svg.append("g") | |
| .attr("class", "polygons") | |
| .selectAll("path") | |
| .data(voronoi.polygons(sites)) | |
| .enter().append("path") | |
| .call(redrawPolygon); | |
| var link = svg.append("g") | |
| .attr("class", "links") | |
| .selectAll("line") | |
| .data(voronoi.links(sites)) | |
| .enter().append("line") | |
| .call(redrawLink); | |
| var site = svg.append("g") | |
| .attr("class", "sites") | |
| .selectAll("circle") | |
| .data(sites) | |
| .enter().append("circle") | |
| .attr("r", 2.5) | |
| .call(redrawSite); | |
| function moved() { | |
| sites[0] = d3.mouse(this); | |
| redraw(); | |
| } | |
| function redraw() { | |
| var diagram = voronoi(sites); | |
| polygon = polygon.data(diagram.polygons()).call(redrawPolygon); | |
| link = link.data(diagram.links()), link.exit().remove(); | |
| link = link.enter().append("line").merge(link).call(redrawLink); | |
| site = site.data(sites).call(redrawSite); | |
| } | |
| function redrawPolygon(polygon) { | |
| polygon | |
| .attr("d", function(d) { return d ? "M" + d.join("L") + "Z" : null; }); | |
| } | |
| function redrawLink(link) { | |
| link | |
| .attr("x1", function(d) { return d.source[0]; }) | |
| .attr("y1", function(d) { return d.source[1]; }) | |
| .attr("x2", function(d) { return d.target[0]; }) | |
| .attr("y2", function(d) { return d.target[1]; }); | |
| } | |
| function redrawSite(site) { | |
| site | |
| .attr("cx", function(d) { return d[0]; }) | |
| .attr("cy", function(d) { return d[1]; }); | |
| } | |
| </script> |
how 2 draw d3.voronoi into google maps
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The voronoi() algorithm goes badly wrong if two points are coincident.
eg insert line 40: vertices[2] = vertices[1];