In D3 3.5, you can generate rounded arcs with d3.svg.arc cornerRadius and separate adjacent arcs with d3.layout.pie padAngle. The schematic representation above shows the circles used to round the arcs’ corners.
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Arc Corners
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var data = [1, 1, 2, 3, 5, 8, 13]; | |
| var width = 960, | |
| height = 500, | |
| outerRadius = height / 2 - 10, | |
| innerRadius = outerRadius - 60, | |
| cornerRadius = 12, | |
| padAngle = .03; | |
| var pie = d3.layout.pie() | |
| .padAngle(padAngle); | |
| var arcs = pie(data); | |
| var arc = d3.svg.arc() | |
| .innerRadius(innerRadius) | |
| .outerRadius(outerRadius) | |
| .cornerRadius(cornerRadius); | |
| var color = d3.scale.category10(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
| svg.append("circle") | |
| .style("fill", "none") | |
| .style("stroke", "#555") | |
| .attr("r", innerRadius); | |
| svg.append("circle") | |
| .style("fill", "none") | |
| .style("stroke", "#555") | |
| .attr("r", outerRadius); | |
| svg.append("g") | |
| .style("stroke", "#555") | |
| .style("fill", "none") | |
| .attr("class", "corner") | |
| .selectAll("circle") | |
| .data(d3.merge(arcs.map(function(d) { | |
| return [ | |
| {angle: d.startAngle + padAngle / 2, radius: outerRadius - cornerRadius, start: +1}, | |
| {angle: d.endAngle - padAngle / 2, radius: outerRadius - cornerRadius, start: -1}, | |
| {angle: d.endAngle - padAngle / 2 * outerRadius / innerRadius, radius: innerRadius + cornerRadius, start: -1}, | |
| {angle: d.startAngle + padAngle / 2 * outerRadius / innerRadius, radius: innerRadius + cornerRadius, start: +1} | |
| ]; | |
| }))) | |
| .enter().append("circle") | |
| .attr("cx", function(d) { return d.start * cornerRadius * Math.cos(d.angle) + Math.sqrt(d.radius * d.radius - cornerRadius * cornerRadius) * Math.sin(d.angle); }) | |
| .attr("cy", function(d) { return d.start * cornerRadius * Math.sin(d.angle) - Math.sqrt(d.radius * d.radius - cornerRadius * cornerRadius) * Math.cos(d.angle); }) | |
| .attr("r", cornerRadius); | |
| svg.append("g").selectAll("path") | |
| .data(arcs) | |
| .enter().append("path") | |
| .style("fill", function(d, i) { return color(i); }) | |
| .style("fill-opacity", .25) | |
| .style("stroke", "#000") | |
| .style("stroke-width", "1.5px") | |
| .attr("d", arc); | |
| </script> |
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