mirror of
https://github.com/photonstorm/phaser
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34 lines
933 B
JavaScript
34 lines
933 B
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2018 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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/**
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* Compute a random unit vector.
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*
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* Computes random values for the given vector between -1 and 1 that can be used to represent a direction.
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*
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* Optionally accepts a scale value to scale the resulting vector by.
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*
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* @function Phaser.Math.RandomXY
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* @since 3.0.0
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*
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* @param {Phaser.Math.Vector2} vector - The Vector to compute random values for.
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* @param {number} [scale=1] - The scale of the random values.
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*
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* @return {Phaser.Math.Vector2} The given Vector.
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*/
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var RandomXY = function (vector, scale)
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{
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if (scale === undefined) { scale = 1; }
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var r = Math.random() * 2 * Math.PI;
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vector.x = Math.cos(r) * scale;
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vector.y = Math.sin(r) * scale;
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return vector;
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};
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module.exports = RandomXY;
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