Arc generator (centroid).
From D3 in Depth book by Peter Cook.
Last active
February 19, 2019 19:39
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Arc generator (centroid)
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| license: gpl-3.0 | |
| height: 230 | |
| border: no |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>Arc generator (centroid)</title> | |
| </head> | |
| <style> | |
| text { | |
| font-family: "Helvetica Neue", Helvetica, sans-serif; | |
| font-size: 12px; | |
| font-weight: bold; | |
| fill: white; | |
| text-anchor: middle; | |
| } | |
| path { | |
| fill: orange; | |
| stroke: white; | |
| } | |
| </style> | |
| <body> | |
| <svg width="700" height="220"> | |
| <g transform="translate(300, 110)"></g> | |
| </svg> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"></script> | |
| <script> | |
| // Create an arc generator with configuration | |
| var arcGenerator = d3.arc() | |
| .innerRadius(20) | |
| .outerRadius(100); | |
| var arcData = [ | |
| {label: 'A', startAngle: 0, endAngle: 0.2}, | |
| {label: 'B', startAngle: 0.2, endAngle: 0.6}, | |
| {label: 'C', startAngle: 0.6, endAngle: 1.4}, | |
| {label: 'D', startAngle: 1.4, endAngle: 3}, | |
| {label: 'E', startAngle: 3, endAngle: 2* Math.PI} | |
| ]; | |
| // Create a path element and set its d attribute | |
| d3.select('g') | |
| .selectAll('path') | |
| .data(arcData) | |
| .enter() | |
| .append('path') | |
| .attr('d', arcGenerator); | |
| // Add labels, using .centroid() to position | |
| d3.select('g') | |
| .selectAll('text') | |
| .data(arcData) | |
| .enter() | |
| .append('text') | |
| .each(function(d) { | |
| var centroid = arcGenerator.centroid(d); | |
| d3.select(this) | |
| .attr('x', centroid[0]) | |
| .attr('y', centroid[1]) | |
| .attr('dy', '0.33em') | |
| .text(d.label); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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