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 hidden or 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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