2016-12-07 17:16:59 +00:00
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var CatmullRom = require('../CatmullRom');
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2017-10-06 03:52:41 +00:00
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/**
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* [description]
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*
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* @function Phaser.Math.Interpolation.CatmullRom
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* @since 3.0.0
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*
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* @param {number} v - [description]
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* @param {number} k - [description]
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*
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* @return {number} [description]
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*/
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2016-12-07 17:16:59 +00:00
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var CatmullRomInterpolation = function (v, k)
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{
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var m = v.length - 1;
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var f = m * k;
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var i = Math.floor(f);
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if (v[0] === v[m])
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{
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if (k < 0)
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{
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i = Math.floor(f = m * (1 + k));
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}
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2017-09-21 01:30:35 +00:00
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return CatmullRom(f - i, v[(i - 1 + m) % m], v[i], v[(i + 1) % m], v[(i + 2) % m]);
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2016-12-07 17:16:59 +00:00
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}
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else
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{
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if (k < 0)
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{
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2017-09-21 01:30:35 +00:00
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return v[0] - (CatmullRom(-f, v[0], v[0], v[1], v[1]) - v[0]);
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2016-12-07 17:16:59 +00:00
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}
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if (k > 1)
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{
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2017-09-21 01:30:35 +00:00
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return v[m] - (CatmullRom(f - m, v[m], v[m], v[m - 1], v[m - 1]) - v[m]);
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2016-12-07 17:16:59 +00:00
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}
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2017-09-21 01:30:35 +00:00
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return CatmullRom(f - i, v[i ? i - 1 : 0], v[i], v[m < i + 1 ? m : i + 1], v[m < i + 2 ? m : i + 2]);
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2016-12-07 17:16:59 +00:00
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}
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};
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module.exports = CatmullRomInterpolation;
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