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CatmullRomInterpolation.js
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CatmullRomInterpolation.js
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/**
* @author Richard Davey <rich@phaser.io>
* @copyright 2013-2024 Phaser Studio Inc.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
var CatmullRom = require('../CatmullRom');
/**
* A Catmull-Rom interpolation method.
*
* @function Phaser.Math.Interpolation.CatmullRom
* @since 3.0.0
*
* @param {number[]} v - The input array of values to interpolate between.
* @param {number} k - The percentage of interpolation, between 0 and 1.
*
* @return {number} The interpolated value.
*/
var CatmullRomInterpolation = function (v, k)
{
var m = v.length - 1;
var f = m * k;
var i = Math.floor(f);
if (v[0] === v[m])
{
if (k < 0)
{
i = Math.floor(f = m * (1 + k));
}
return CatmullRom(f - i, v[(i - 1 + m) % m], v[i], v[(i + 1) % m], v[(i + 2) % m]);
}
else
{
if (k < 0)
{
return v[0] - (CatmullRom(-f, v[0], v[0], v[1], v[1]) - v[0]);
}
if (k > 1)
{
return v[m] - (CatmullRom(f - m, v[m], v[m], v[m - 1], v[m - 1]) - v[m]);
}
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]);
}
};
module.exports = CatmullRomInterpolation;