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https://github.com/photonstorm/phaser
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14 lines
342 B
JavaScript
14 lines
342 B
JavaScript
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import Clamp from 'math/Clamp.js';
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// Get the angle in radians between the two given vectors
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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 len = Math.sqrt(a[0] * a[0] + a[1] * a[1]);
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const lenV = Math.sqrt(b[0] * b[0] + b[1] * b[1]);
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return Math.acos(Clamp(dot / (len * lenV), -1, 1));
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}
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