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There is also this solution to the similar problem https://stackoverflow.com/questions/35639290/d3js-pie-chart-gradient
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June 8, 2018 00:31
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Arc gradients
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <script> | |
| let data = [25,30,40,17]; | |
| let height = 750; | |
| let width = height; | |
| let radius = height * 0.4; | |
| let hole = radius * 0.5; | |
| let colour = d3.scaleSequential(d3.interpolatePlasma) | |
| let svg = d3.select('body') | |
| .append('svg') | |
| .attr('width', width) | |
| .attr('height', height) | |
| let arcFill = svg.append('g') | |
| .attr('transform', 'translate(' + width/2 + ',' + width/2 + ')'); | |
| let arcOutline = svg.append('g') | |
| .attr('transform', 'translate(' + width/2 + ',' + width/2 + ')'); | |
| let arc = d3.arc() | |
| .innerRadius(hole) | |
| .outerRadius(radius); | |
| let pie = d3.pie() | |
| .sort(null) | |
| .value(function(d) { return d; }) | |
| data = pie(data); | |
| arcOutline.selectAll('.arc') | |
| .data(data) | |
| .enter() | |
| .append('path') | |
| .attr('class', 'arc') | |
| .attr('d', arc) | |
| .style('fill', function(d){ | |
| return createGradient(d) | |
| }) | |
| .style("stroke", "white") | |
| .style("stroke-width", "3px") | |
| function createGradient(d) { | |
| let miniArcs = [] | |
| let angleExtent = d.endAngle - d.startAngle | |
| let noOfArcs = angleExtent * 75 //seems like a good number | |
| colour.domain([0, noOfArcs]) | |
| let miniArcAngle = angleExtent/noOfArcs | |
| for (var j = 0; j < noOfArcs; j++) { | |
| let miniArc = {} | |
| miniArc.startAngle = d.startAngle + (miniArcAngle * j) | |
| //0.01 so the colours overlap slightly, so there's no funny artefacts. | |
| miniArc.endAngle = miniArc.startAngle + miniArcAngle + 0.01 | |
| //unless it goes beyond the end of the parent arc | |
| miniArc.endAngle = miniArc.endAngle > d.endAngle ? d.endAngle : miniArc.endAngle | |
| miniArcs.push(miniArc) | |
| } | |
| arcFill.selectAll('.mini-arc') | |
| .data(miniArcs) | |
| .enter() | |
| .append("g") | |
| .append('path') | |
| .attr('class', 'arc') | |
| .attr('d', arc) | |
| .style("fill", function(a, i){ return colour(i) }) | |
| return "none" | |
| } | |
| </script> | |
| </body> | |
| </html> |
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