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https://github.com/photonstorm/phaser
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38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2022 Photon Storm Ltd.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
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/**
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* Rotate a `point` around `x` and `y` to the given `angle`, at the same distance.
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*
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* In polar notation, this maps a point from (r, t) to (r, angle), vs. the origin (x, y).
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*
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* @function Phaser.Math.RotateAround
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* @since 3.0.0
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*
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* @generic {Phaser.Types.Math.Vector2Like} T - [point,$return]
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*
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* @param {(Phaser.Geom.Point|object)} point - The point to be rotated.
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* @param {number} x - The horizontal coordinate to rotate around.
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* @param {number} y - The vertical coordinate to rotate around.
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* @param {number} angle - The angle of rotation in radians.
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*
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* @return {Phaser.Types.Math.Vector2Like} The given point.
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*/
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var RotateAround = function (point, x, y, angle)
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{
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var c = Math.cos(angle);
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var s = Math.sin(angle);
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var tx = point.x - x;
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var ty = point.y - y;
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point.x = tx * c - ty * s + x;
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point.y = tx * s + ty * c + y;
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return point;
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};
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module.exports = RotateAround;
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