@litecanvas/utils/src/math/wave.js

Utilities to help build litecanvas games

/**
 * Interpolate between 2 values using a periodic function (default: `Math.sin`).
 *
 * @param {number} lower
 * @param {number} higher
 * @param {number} t
 * @param {function} [fn=Math.sin]
 * @returns {number}
 */
export default (lower, higher, t, fn = Math.sin) =>
  lower + ((fn(t) + 1) / 2) * (higher - lower)