This example demonstrates using a data-join with a key function to update a pie chart.
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Pie Chart Update, V
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| license: gpl-3.0 |
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| region | fruit | count | |
|---|---|---|---|
| East | Apples | 53245 | |
| West | Apples | 28479 | |
| South | Apples | 19697 | |
| North | Apples | 24037 | |
| Central | Apples | 40245 | |
| East | Oranges | 200 | |
| South | Oranges | 200 | |
| Central | Oranges | 200 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; | |
| margin: auto; | |
| position: relative; | |
| width: 960px; | |
| } | |
| text { | |
| font: 10px sans-serif; | |
| } | |
| form { | |
| position: absolute; | |
| right: 10px; | |
| top: 10px; | |
| } | |
| input { | |
| margin: 0 7px; | |
| } | |
| </style> | |
| <form></form> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| radius = Math.min(width, height) / 2; | |
| var color = d3.scale.category20(); | |
| var pie = d3.layout.pie() | |
| .value(function(d) { return d.count; }) | |
| .sort(null); | |
| var arc = d3.svg.arc() | |
| .innerRadius(radius - 100) | |
| .outerRadius(radius - 20); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
| var path = svg.selectAll("path"); | |
| d3.tsv("data.tsv", type, function(error, data) { | |
| var regionsByFruit = d3.nest() | |
| .key(function(d) { return d.fruit; }) | |
| .entries(data) | |
| .reverse(); | |
| var label = d3.select("form").selectAll("label") | |
| .data(regionsByFruit) | |
| .enter().append("label"); | |
| label.append("input") | |
| .attr("type", "radio") | |
| .attr("name", "fruit") | |
| .attr("value", function(d) { return d.key; }) | |
| .on("change", change) | |
| .filter(function(d, i) { return !i; }) | |
| .each(change) | |
| .property("checked", true); | |
| label.append("span") | |
| .text(function(d) { return d.key; }); | |
| function change(region) { | |
| var data0 = path.data(), | |
| data1 = pie(region.values); | |
| path = path.data(data1, key); | |
| path.enter().append("path") | |
| .each(function(d, i) { this._current = findNeighborArc(i, data0, data1, key) || d; }) | |
| .attr("fill", function(d) { return color(d.data.region); }) | |
| .append("title") | |
| .text(function(d) { return d.data.region; }); | |
| path.exit() | |
| .datum(function(d, i) { return findNeighborArc(i, data1, data0, key) || d; }) | |
| .transition() | |
| .duration(750) | |
| .attrTween("d", arcTween) | |
| .remove(); | |
| path.transition() | |
| .duration(750) | |
| .attrTween("d", arcTween); | |
| } | |
| }); | |
| function key(d) { | |
| return d.data.region; | |
| } | |
| function type(d) { | |
| d.count = +d.count; | |
| return d; | |
| } | |
| function findNeighborArc(i, data0, data1, key) { | |
| var d; | |
| return (d = findPreceding(i, data0, data1, key)) ? {startAngle: d.endAngle, endAngle: d.endAngle} | |
| : (d = findFollowing(i, data0, data1, key)) ? {startAngle: d.startAngle, endAngle: d.startAngle} | |
| : null; | |
| } | |
| // Find the element in data0 that joins the highest preceding element in data1. | |
| function findPreceding(i, data0, data1, key) { | |
| var m = data0.length; | |
| while (--i >= 0) { | |
| var k = key(data1[i]); | |
| for (var j = 0; j < m; ++j) { | |
| if (key(data0[j]) === k) return data0[j]; | |
| } | |
| } | |
| } | |
| // Find the element in data0 that joins the lowest following element in data1. | |
| function findFollowing(i, data0, data1, key) { | |
| var n = data1.length, m = data0.length; | |
| while (++i < n) { | |
| var k = key(data1[i]); | |
| for (var j = 0; j < m; ++j) { | |
| if (key(data0[j]) === k) return data0[j]; | |
| } | |
| } | |
| } | |
| function arcTween(d) { | |
| var i = d3.interpolate(this._current, d); | |
| this._current = i(0); | |
| return function(t) { return arc(i(t)); }; | |
| } | |
| </script> |
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