arcade-physics/lib/math/RandomXYZ.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 });
/**
 * Compute a random position vector in a spherical area, optionally defined by the given radius.
 *
 * @function Phaser.Math.RandomXYZ
 * @since 3.0.0
 *
 * @param {Phaser.Math.Vector3} vec3 - The Vector to compute random values for.
 * @param {number} [radius=1] - The radius.
 *
 * @return {Phaser.Math.Vector3} The given Vector.
 */
const RandomXYZ = (vec3, radius) => {
    if (radius === undefined) {
        radius = 1;
    }
    const r = Math.random() * 2 * Math.PI;
    const z = Math.random() * 2 - 1;
    const zScale = Math.sqrt(1 - z * z) * radius;
    vec3.x = Math.cos(r) * zScale;
    vec3.y = Math.sin(r) * zScale;
    vec3.z = z * radius;
    return vec3;
};
exports.default = RandomXYZ;
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