Simple demonstration of d3-tricontour, reproducing this matplotlib demo.
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Tricontour flower
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://unpkg.com/d3@5"></script> | |
| <script src="https://unpkg.com/d3-delaunay@5"></script> | |
| <script src="https://unpkg.com/[email protected]"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| const data = []; | |
| for (let r = 0; r < 1; r += 0.1) | |
| for (let angle = 0; angle < 2 * Math.PI; angle += (2 * Math.PI) / 48) | |
| data.push([ | |
| r * Math.cos(angle), | |
| r * Math.sin(angle), | |
| Math.cos(r) * Math.cos(3 * angle) * (r >= 0.1) | |
| ]); | |
| const tric = d3.tricontour(); | |
| const contours = tric(data); | |
| const width = 500, height = 300; | |
| const show = ["contours", "points", /*"delaunay" */]; | |
| const scales = ({ | |
| x: d3.scaleLinear().range(d3.extent(data, d => d[0])), | |
| y: d3.scaleLinear().range(d3.extent(data, d => d[1])), | |
| color: d3 | |
| .scaleSequential(d3.interpolateTurbo) | |
| .domain(d3.extent(data, d => d[2])) | |
| }); | |
| const svg = d3.select("body").append("svg") | |
| .style("background", "#333") | |
| .attr("viewBox", [ | |
| scales.x(-1.5 / 20), | |
| scales.y(-1.5 / 20), | |
| scales.x(1 + 1.5 / 20) - scales.x(-1.5 / 20), | |
| scales.y(1 + 1.5 / 20) - scales.y(-1.5 / 20) | |
| ]); | |
| const g = svg.append("g"); | |
| const path = d3.geoPath().pointRadius(scales.x(2 / width) - scales.x(0)); | |
| if (show.indexOf("contours") > -1) { | |
| g.append("g") | |
| .selectAll("path") | |
| .data(contours) | |
| .join("path") | |
| .attr("d", path) | |
| .attr("fill", d => scales.color(d.value)) | |
| .attr("fill-opacity", 0.8) | |
| .append("title") | |
| .text(d => d.value); | |
| } | |
| if (show.indexOf("delaunay") > -1) { | |
| g.append("path") | |
| .attr("vector-effect", "non-scaling-stroke") | |
| .attr("d", d3.Delaunay.from(data).render()) | |
| .attr("fill", "none") | |
| .attr("stroke-width", 0.5) | |
| .attr("stroke", "white"); | |
| } | |
| if (show.indexOf("points") > -1) { | |
| const pts = g | |
| .append("g") | |
| .selectAll("circle") | |
| .data(data) | |
| .join("path") | |
| .attr("d", d => path({ type: "Point", coordinates: d })) | |
| .attr("fill", d => scales.color(d[2])); | |
| } | |
| </script> | |
| </body> |
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