| [76] | 1 | <!DOCTYPE html> |
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| 2 | <html> |
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| 3 | <head> |
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| 4 | <title>Donut Chart</title> |
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| 5 | <script type="text/javascript" src="../../d3.js"></script> |
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| 6 | <script type="text/javascript" src="../../d3.layout.js"></script> |
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| 7 | <style type="text/css"> |
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| 8 | |
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| 9 | body { |
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| 10 | font: 10px sans-serif; |
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| 11 | } |
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| 12 | |
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| 13 | </style> |
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| 14 | </head> |
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| 15 | <body> |
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| 16 | <script type="text/javascript"> |
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| 17 | |
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| 18 | var w = 400, |
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| 19 | h = 400, |
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| 20 | r1 = Math.min(w, h) / 2, |
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| 21 | r0 = r1 * .6, |
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| 22 | n = 10, |
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| 23 | q = 0, |
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| 24 | data0 = d3.range(n).map(Math.random), |
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| 25 | data1 = d3.range(n).map(Math.random), |
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| 26 | data, |
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| 27 | color = d3.scale.category20(), |
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| 28 | arc = d3.svg.arc(), |
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| 29 | donut = d3.layout.pie(); |
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| 30 | |
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| 31 | var vis = d3.select("body") |
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| 32 | .append("svg:svg") |
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| 33 | .attr("width", w) |
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| 34 | .attr("height", h); |
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| 35 | |
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| 36 | vis.selectAll("g.arc") |
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| 37 | .data(arcs(data0, data1)) |
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| 38 | .enter().append("svg:g") |
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| 39 | .attr("class", "arc") |
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| 40 | .attr("transform", "translate(" + r1 + "," + r1 + ")") |
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| 41 | .append("svg:path") |
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| 42 | .attr("fill", function(d, i) { return color(i); }) |
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| 43 | .attr("d", arc); |
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| 44 | |
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| 45 | window.addEventListener("keypress", swap, false); |
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| 46 | |
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| 47 | function arcs(data0, data1) { |
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| 48 | var arcs0 = donut(data0), |
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| 49 | arcs1 = donut(data1), |
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| 50 | i = -1, |
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| 51 | arc; |
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| 52 | while (++i < n) { |
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| 53 | arc = arcs0[i]; |
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| 54 | arc.innerRadius = r0; |
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| 55 | arc.outerRadius = r1; |
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| 56 | arc.next = arcs1[i]; |
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| 57 | } |
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| 58 | return arcs0; |
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| 59 | } |
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| 60 | |
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| 61 | function swap() { |
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| 62 | d3.selectAll("g.arc > path") |
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| 63 | .data(++q & 1 ? arcs(data0, data1) : arcs(data1, data0)) |
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| 64 | .each(transitionSplit); |
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| 65 | } |
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| 66 | |
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| 67 | // 1. Wedges split into two rings. |
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| 68 | function transitionSplit(d, i) { |
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| 69 | d3.select(this) |
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| 70 | .transition().duration(1000) |
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| 71 | .attrTween("d", tweenArc({ |
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| 72 | innerRadius: i & 1 ? r0 : (r0 + r1) / 2, |
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| 73 | outerRadius: i & 1 ? (r0 + r1) / 2 : r1 |
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| 74 | })) |
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| 75 | .each("end", transitionRotate); |
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| 76 | } |
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| 77 | |
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| 78 | // 2. Wedges translate to be centered on their final position. |
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| 79 | function transitionRotate(d, i) { |
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| 80 | var a0 = d.next.startAngle + d.next.endAngle, |
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| 81 | a1 = d.startAngle - d.endAngle; |
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| 82 | d3.select(this) |
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| 83 | .transition().duration(1000) |
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| 84 | .attrTween("d", tweenArc({ |
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| 85 | startAngle: (a0 + a1) / 2, |
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| 86 | endAngle: (a0 - a1) / 2 |
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| 87 | })) |
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| 88 | .each("end", transitionResize); |
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| 89 | } |
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| 90 | |
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| 91 | // 3. Wedges then update their values, changing size. |
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| 92 | function transitionResize(d, i) { |
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| 93 | d3.select(this) |
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| 94 | .transition().duration(1000) |
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| 95 | .attrTween("d", tweenArc({ |
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| 96 | startAngle: d.next.startAngle, |
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| 97 | endAngle: d.next.endAngle |
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| 98 | })) |
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| 99 | .each("end", transitionUnite); |
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| 100 | } |
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| 101 | |
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| 102 | // 4. Wedges reunite into a single ring. |
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| 103 | function transitionUnite(d, i) { |
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| 104 | d3.select(this) |
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| 105 | .transition().duration(1000) |
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| 106 | .attrTween("d", tweenArc({ |
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| 107 | innerRadius: r0, |
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| 108 | outerRadius: r1 |
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| 109 | })); |
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| 110 | } |
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| 111 | |
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| 112 | function tweenArc(b) { |
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| 113 | return function(a) { |
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| 114 | var i = d3.interpolate(a, b); |
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| 115 | for (var key in b) a[key] = b[key]; // update data |
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| 116 | return function(t) { |
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| 117 | return arc(i(t)); |
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| 118 | }; |
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| 119 | }; |
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| 120 | } |
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| 121 | |
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| 122 | </script> |
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| 123 | </body> |
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| 124 | </html> |
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