35 lines
889 B
Plaintext
35 lines
889 B
Plaintext
/* Example of use:
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access piechart;
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unitsize (70);
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int[] values = {1, 2, 3, 2};
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string[] labels = {"a", "b", "c", "very long"};
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add(piechart.pie(values, labels, 1.2, green, labelcolor=blue));
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*/
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picture pie (int[] values, string[] labels={}, real distance = 0.5, pen color = rgb(1,1,1), pen labelcolor = rgb(0, 0, 0)) {
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picture opic;
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// unitsize(100);
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int total = 0;
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for (int i: values) {
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total += i;
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}
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if (total != 0) {
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real last = 0;
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for (int i = 0; i < values.length; ++i) {
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real current = last+values[i]*360/total;
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filldraw(opic, arc((0,0), 1, last, current) -- (0,0) -- cycle, values[i]/total * color);
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if (labels.length == values.length) {
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// rotate() 0 angle is upwards. We shift it to match the trigonometric circle.
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label (opic, labels[i], rotate((current+last)/2-90) * (0, distance), labelcolor);
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}
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last = current;
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}
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}
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return opic;
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}
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