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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