A minimalist donut chart rendered to Canvas using d3-shape.
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July 21, 2019 15:42
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Canvas Donut
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/donut-chart |
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| age | population | |
|---|---|---|
| <5 | 2704659 | |
| 5-13 | 4499890 | |
| 14-17 | 2159981 | |
| 18-24 | 3853788 | |
| 25-44 | 14106543 | |
| 45-64 | 8819342 | |
| ≥65 | 612463 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <canvas width="960" height="500"></canvas> | |
| <script src="//d3js.org/d3.v4.0.0-alpha.4.min.js"></script> | |
| <script> | |
| var canvas = document.querySelector("canvas"), | |
| context = canvas.getContext("2d"); | |
| var width = canvas.width, | |
| height = canvas.height, | |
| radius = Math.min(width, height) / 2; | |
| var colors = ["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]; | |
| var arc = d3.arc() | |
| .outerRadius(radius - 10) | |
| .innerRadius(radius - 70) | |
| .context(context); | |
| var labelArc = d3.arc() | |
| .outerRadius(radius - 40) | |
| .innerRadius(radius - 40) | |
| .context(context); | |
| var pie = d3.pie() | |
| .sort(null) | |
| .value(function(d) { return d.population; }); | |
| context.translate(width / 2, height / 2); | |
| d3.requestTsv("data.tsv", function(d) { | |
| d.population = +d.population; | |
| return d; | |
| }, function(error, data) { | |
| if (error) throw error; | |
| var arcs = pie(data); | |
| arcs.forEach(function(d, i) { | |
| context.beginPath(); | |
| arc(d); | |
| context.fillStyle = colors[i]; | |
| context.fill(); | |
| }); | |
| context.beginPath(); | |
| arcs.forEach(arc); | |
| context.strokeStyle = "#fff"; | |
| context.stroke(); | |
| context.textAlign = "center"; | |
| context.textBaseline = "middle"; | |
| context.fillStyle = "#000"; | |
| arcs.forEach(function(d) { | |
| var c = labelArc.centroid(d); | |
| context.fillText(d.data.age, c[0], c[1]); | |
| }); | |
| }); | |
| </script> |
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