phaser/src/math/SmootherStep.js

30 lines
876 B
JavaScript

/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2018 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* Smoothly interpolate between two values.
*
* Computes a smooth step interpolation between `min` and `max` by `x`.
*
* Produces an even smoother interpolation than {@link Phaser.Math.SmoothStep}.
*
* @function Phaser.Math.SmootherStep
* @since 3.0.0
*
* @param {number} x - The percentage of interpolation, between 0 and 1.
* @param {number} min - The minimum value.
* @param {number} max - The maximum value.
*
* @return {number} The smoothly interpolated value.
*/
var SmootherStep = function (x, min, max)
{
x = Math.max(0, Math.min(1, (x - min) / (max - min)));
return x * x * x * (x * (x * 6 - 15) + 10);
};
module.exports = SmootherStep;