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Last change
on this file since e4c61dd was e4c61dd, checked in by istevanoska <ilinastevanoska@…>, 6 months ago |
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Prototype 1.1
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-
Property mode
set to
100644
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File size:
346 bytes
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| 1 | export default function(polygon) {
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| 2 | var i = -1,
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| 3 | n = polygon.length,
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| 4 | x = 0,
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| 5 | y = 0,
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| 6 | a,
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| 7 | b = polygon[n - 1],
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| 8 | c,
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| 9 | k = 0;
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| 10 |
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| 11 | while (++i < n) {
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| 12 | a = b;
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| 13 | b = polygon[i];
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| 14 | k += c = a[0] * b[1] - b[0] * a[1];
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| 15 | x += (a[0] + b[0]) * c;
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| 16 | y += (a[1] + b[1]) * c;
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| 17 | }
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| 18 |
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| 19 | return k *= 3, [x / k, y / k];
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| 20 | }
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