mirror of
https://github.com/photonstorm/phaser
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49 lines
1.8 KiB
JavaScript
49 lines
1.8 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2019 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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var Vector2 = require('./Vector2');
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/**
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* Takes the `x` and `y` coordinates and transforms them into the same space as
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* defined by the position, rotation and scale values.
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*
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* @function Phaser.Math.TransformXY
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* @since 3.0.0
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*
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* @param {number} x - The x coordinate to be transformed.
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* @param {number} y - The y coordinate to be transformed.
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* @param {number} positionX - Horizontal position of the transform point.
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* @param {number} positionY - Vertical position of the transform point.
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* @param {number} rotation - Rotation of the transform point, in radians.
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* @param {number} scaleX - Horizontal scale of the transform point.
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* @param {number} scaleY - Vertical scale of the transform point.
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* @param {(Phaser.Math.Vector2|Phaser.Geom.Point|object)} [output] - The output vector, point or object for the translated coordinates.
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*
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* @return {(Phaser.Math.Vector2|Phaser.Geom.Point|object)} The translated point.
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*/
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var TransformXY = function (x, y, positionX, positionY, rotation, scaleX, scaleY, output)
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{
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if (output === undefined) { output = new Vector2(); }
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var radianSin = Math.sin(rotation);
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var radianCos = Math.cos(rotation);
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// Rotate and Scale
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var a = radianCos * scaleX;
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var b = radianSin * scaleX;
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var c = -radianSin * scaleY;
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var d = radianCos * scaleY;
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// Invert
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var id = 1 / ((a * d) + (c * -b));
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output.x = (d * id * x) + (-c * id * y) + (((positionY * c) - (positionX * d)) * id);
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output.y = (a * id * y) + (-b * id * x) + (((-positionY * a) + (positionX * b)) * id);
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return output;
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};
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module.exports = TransformXY;
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