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export default function(polygon) { |
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var i = -1, |
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n = polygon.length, |
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a, |
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b = polygon[n - 1], |
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area = 0; |
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while (++i < n) { |
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a = b; |
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b = polygon[i]; |
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area += a[1] * b[0] - a[0] * b[1]; |
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} |
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return area / 2; |
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}
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