arcade-physics/lib/math/SinCosTableGenerator.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 });
/**
 * Generate a series of sine and cosine values.
 *
 * @function Phaser.Math.SinCosTableGenerator
 * @since 3.0.0
 *
 * @param {number} length - The number of values to generate.
 * @param {number} [sinAmp=1] - The sine value amplitude.
 * @param {number} [cosAmp=1] - The cosine value amplitude.
 * @param {number} [frequency=1] - The frequency of the values.
 *
 * @return {Phaser.Types.Math.SinCosTable} The generated values.
 */
const SinCosTableGenerator = (length, sinAmp, cosAmp, frequency) => {
    if (sinAmp === undefined) {
        sinAmp = 1;
    }
    if (cosAmp === undefined) {
        cosAmp = 1;
    }
    if (frequency === undefined) {
        frequency = 1;
    }
    frequency *= Math.PI / length;
    const cos = [];
    const sin = [];
    for (let c = 0; c < length; c++) {
        cosAmp -= sinAmp * frequency;
        sinAmp += cosAmp * frequency;
        cos[c] = cosAmp;
        sin[c] = sinAmp;
    }
    return {
        sin: sin,
        cos: cos,
        length: length
    };
};
exports.default = SinCosTableGenerator;
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