mirror of
https://github.com/photonstorm/phaser
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33 lines
1.2 KiB
JavaScript
33 lines
1.2 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2020 Photon Storm Ltd.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
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/**
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* Calculate a smoother interpolation percentage of `x` between `min` and `max`.
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*
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* The function receives the number `x` as an argument and returns 0 if `x` is less than or equal to the left edge,
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* 1 if `x` is greater than or equal to the right edge, and smoothly interpolates, using a Hermite polynomial,
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* between 0 and 1 otherwise.
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*
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* Produces an even smoother interpolation than {@link Phaser.Math.SmoothStep}.
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*
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* @function Phaser.Math.SmootherStep
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* @since 3.0.0
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* @see {@link https://en.wikipedia.org/wiki/Smoothstep#Variations}
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*
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* @param {number} x - The input value.
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* @param {number} min - The minimum value, also known as the 'left edge', assumed smaller than the 'right edge'.
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* @param {number} max - The maximum value, also known as the 'right edge', assumed greater than the 'left edge'.
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*
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* @return {number} The percentage of interpolation, between 0 and 1.
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*/
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var SmootherStep = function (x, min, max)
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{
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x = Math.max(0, Math.min(1, (x - min) / (max - min)));
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return x * x * x * (x * (x * 6 - 15) + 10);
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};
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module.exports = SmootherStep;
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