arcade-physics/lib/math/RotateAround.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}
 */
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Rotate a `point` around `x` and `y` to the given `angle`, at the same distance.
 *
 * In polar notation, this maps a point from (r, t) to (r, angle), vs. the origin (x, y).
 *
 * @function Phaser.Math.RotateAround
 * @since 3.0.0
 *
 * @generic {Phaser.Types.Math.Vector2Like} T - [point,$return]
 *
 * @param {(Phaser.Geom.Point|object)} point - The point to be rotated.
 * @param {number} x - The horizontal coordinate to rotate around.
 * @param {number} y - The vertical coordinate to rotate around.
 * @param {number} angle - The angle of rotation in radians.
 *
 * @return {Phaser.Types.Math.Vector2Like} The given point.
 */
const RotateAround = (point, x, y, angle) => {
    const c = Math.cos(angle);
    const s = Math.sin(angle);
    const tx = point.x - x;
    const ty = point.y - y;
    point.x = tx * c - ty * s + x;
    point.y = tx * s + ty * c + y;
    return point;
};
exports.default = RotateAround;
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