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https://github.com/photonstorm/phaser
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15 lines
245 B
JavaScript
15 lines
245 B
JavaScript
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// Project vector b onto vector a and return a
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export default function (a, b) {
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const dot = a[0] * b[0] + a[1] * b[1];
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const lenV = b[0] * b[0] + b[1] * b[1];
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const s = dot / lenV;
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a[0] *= s;
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a[1] *= s;
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return a;
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}
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