arcade-physics/lib/math/interpolation/CatmullRomInterpolation.js

Use Arcade Physics without Phaser.

"use strict";
/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2020 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const CatmullRom_1 = __importDefault(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.
 */
const CatmullRomInterpolation = (v, k) => {
    const m = v.length - 1;
    let f = m * k;
    let i = Math.floor(f);
    if (v[0] === v[m]) {
        if (k < 0) {
            i = Math.floor((f = m * (1 + k)));
        }
        return (0, CatmullRom_1.default)(f - i, v[(i - 1 + m) % m], v[i], v[(i + 1) % m], v[(i + 2) % m]);
    }
    else {
        if (k < 0) {
            return v[0] - ((0, CatmullRom_1.default)(-f, v[0], v[0], v[1], v[1]) - v[0]);
        }
        if (k > 1) {
            return v[m] - ((0, CatmullRom_1.default)(f - m, v[m], v[m], v[m - 1], v[m - 1]) - v[m]);
        }
        return (0, CatmullRom_1.default)(f - i, v[i ? i - 1 : 0], v[i], v[m < i + 1 ? m : i + 1], v[m < i + 2 ? m : i + 2]);
    }
};
exports.default = CatmullRomInterpolation;
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