@phaserjs/phaser/math/SinCosTableGenerator.js

Phaser 4

/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2020 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */
export function SinCosTableGenerator(length, sinAmp = 1, cosAmp = 1, 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,
    cos,
    length
  };
}