A demonstration of arc.cornerRadius.
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February 9, 2016 01:47
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Arc Corners
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license: gpl-3.0 |
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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 data = [1, 1, 2, 3, 5, 8, 13]; | |
var canvas = document.querySelector("canvas"), | |
context = canvas.getContext("2d"); | |
var width = canvas.width, | |
height = canvas.height, | |
radius = Math.min(width, height) / 2; | |
var colors = [ | |
"#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd", | |
"#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf" | |
]; | |
var outerRadius = radius - 10, | |
cornerRadius = 12; | |
var arc = d3.arc() | |
.outerRadius(outerRadius) | |
.innerRadius(0) | |
.cornerRadius(cornerRadius) | |
.context(context); | |
var circle = d3.arc() | |
.startAngle(0) | |
.endAngle(2 * Math.PI) | |
.innerRadius(0) | |
.context(context); | |
var pie = d3.pie(); | |
var arcs = pie(data); | |
context.translate(width / 2, height / 2); | |
context.globalAlpha = 0.5; | |
arcs.forEach(function(d, i) { | |
context.beginPath(); | |
arc(d); | |
context.fillStyle = colors[i]; | |
context.fill(); | |
}); | |
context.globalAlpha = 1; | |
context.beginPath(); | |
arcs.forEach(arc); | |
context.lineWidth = 1.5; | |
context.strokeStyle = "#fff"; | |
context.stroke(); | |
context.beginPath(); | |
arcs.forEach(function(d) { | |
corner(d.startAngle, outerRadius - cornerRadius, +1); | |
corner( d.endAngle, outerRadius - cornerRadius, -1); | |
}); | |
context.strokeStyle = "#000"; | |
context.stroke(); | |
function corner(angle, radius, sign) { | |
context.save(); | |
context.translate( | |
sign * cornerRadius * Math.cos(angle) + Math.sqrt(radius * radius - cornerRadius * cornerRadius) * Math.sin(angle), | |
sign * cornerRadius * Math.sin(angle) - Math.sqrt(radius * radius - cornerRadius * cornerRadius) * Math.cos(angle) | |
); | |
circle.outerRadius(cornerRadius - 1.5)(); | |
context.restore(); | |
} | |
</script> |
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