Use D3's general update pattern to animate pie chart transitions. I got the arcTween function from this block by Mike Bostock (so you know it's good).
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July 21, 2017 08:01
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Pie Update Pattern
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://unpkg.com/jeezy/lib/jeezy.min.js"></script> | |
| <script> | |
| var alphabet = "abcdef".split(""); | |
| var margin = {top: 10, bottom: 10, left: 10, right: 10}, | |
| width = window.innerWidth - margin.left - margin.right, | |
| height = window.innerHeight - margin.top - margin.bottom, | |
| radius = Math.min(width, height) / 2; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + ((width / 2) + margin.left) + "," + ((height / 2) + margin.top) + ")"); | |
| var color = d3.scaleOrdinal(["#66c2a5","#fc8d62","#8da0cb","#e78ac3","#a6d854","#ffd92f"]) | |
| var pie = d3.pie() | |
| .sort(null) | |
| .value(function(d) { return d.value; }); | |
| var arc = d3.arc() | |
| .outerRadius(radius) | |
| .innerRadius(0); | |
| redraw(randomData(alphabet)); | |
| d3.interval(function(){ | |
| redraw(randomData(alphabet)); | |
| }, 2000) | |
| function redraw(data){ | |
| // join | |
| var arcs = svg.selectAll(".arc") | |
| .data(pie(data), function(d){ return d.data.name; }); | |
| // update | |
| arcs | |
| .transition() | |
| .duration(1500) | |
| .attrTween("d", arcTween); | |
| // enter | |
| arcs.enter().append("path") | |
| .attr("class", "arc") | |
| .attr("fill", function(d, i) { return color(i); }) | |
| .attr("d", arc) | |
| .each(function(d) { this._current = d; }); | |
| } | |
| // Store the displayed angles in _current. | |
| // Then, interpolate from _current to the new angles. | |
| // During the transition, _current is updated in-place by d3.interpolate. | |
| function arcTween(a) { | |
| console.log(this._current); | |
| var i = d3.interpolate(this._current, a); | |
| this._current = i(0); | |
| return function(t) { | |
| return arc(i(t)); | |
| }; | |
| } | |
| function randomData(data){ | |
| return data.map(function(d){ | |
| return { | |
| name: d, | |
| value: jz.num.randBetween(1, 10) | |
| } | |
| }); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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