@phaserjs/phaser/math/SmoothStep.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 SmoothStep(x, min, max) {
  if (x <= min) {
    return 0;
  }
  if (x >= max) {
    return 1;
  }
  x = (x - min) / (max - min);
  return x * x * (3 - 2 * x);
}