phaser/src/tweens/builders/GetEaseFunction.js

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/**
* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2019 Photon Storm Ltd.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
var EaseMap = require('../../math/easing/EaseMap');
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/**
* [description]
*
* @function Phaser.Tweens.Builders.GetEaseFunction
* @since 3.0.0
*
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* @param {(string|function)} ease - [description]
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* @param {array} easeParams - [description]
*
* @return {function} [description]
*/
var GetEaseFunction = function (ease, easeParams)
{
if (typeof ease === 'string' && EaseMap.hasOwnProperty(ease))
{
if (easeParams)
{
var cloneParams = easeParams.slice(0);
cloneParams.unshift(0);
return function (v)
{
cloneParams[0] = v;
return EaseMap[ease].apply(this, cloneParams);
};
}
else
{
// String based look-up
return EaseMap[ease];
}
}
else if (typeof ease === 'function')
{
// Custom function
return ease;
}
else if (Array.isArray(ease) && ease.length === 4)
{
// Bezier function (TODO)
}
return EaseMap.Power0;
};
module.exports = GetEaseFunction;