arcade-physics/lib/math/TransformXY.js

Use Arcade Physics without Phaser.

"use strict";
/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2020 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const Vector2_1 = __importDefault(require("./Vector2"));
/**
 * Takes the `x` and `y` coordinates and transforms them into the same space as
 * defined by the position, rotation and scale values.
 *
 * @function Phaser.Math.TransformXY
 * @since 3.0.0
 *
 * @param {number} x - The x coordinate to be transformed.
 * @param {number} y - The y coordinate to be transformed.
 * @param {number} positionX - Horizontal position of the transform point.
 * @param {number} positionY - Vertical position of the transform point.
 * @param {number} rotation - Rotation of the transform point, in radians.
 * @param {number} scaleX - Horizontal scale of the transform point.
 * @param {number} scaleY - Vertical scale of the transform point.
 * @param {(Phaser.Math.Vector2|Phaser.Geom.Point|object)} [output] - The output vector, point or object for the translated coordinates.
 *
 * @return {(Phaser.Math.Vector2|Phaser.Geom.Point|object)} The translated point.
 */
const TransformXY = (x, y, positionX, positionY, rotation, scaleX, scaleY, output) => {
    if (output === undefined) {
        output = new Vector2_1.default();
    }
    const radianSin = Math.sin(rotation);
    const radianCos = Math.cos(rotation);
    // Rotate and Scale
    const a = radianCos * scaleX;
    const b = radianSin * scaleX;
    const c = -radianSin * scaleY;
    const d = radianCos * scaleY;
    //  Invert
    const id = 1 / (a * d + c * -b);
    output.x = d * id * x + -c * id * y + (positionY * c - positionX * d) * id;
    output.y = a * id * y + -b * id * x + (-positionY * a + positionX * b) * id;
    return output;
};
exports.default = TransformXY;
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