arcade-physics/lib/math/interpolation/LinearInterpolation.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 Linear_1 = __importDefault(require("../Linear"));
/**
 * A linear interpolation method.
 *
 * @function Phaser.Math.Interpolation.Linear
 * @since 3.0.0
 * @see {@link https://en.wikipedia.org/wiki/Linear_interpolation}
 *
 * @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 LinearInterpolation = (v, k) => {
    const m = v.length - 1;
    const f = m * k;
    const i = Math.floor(f);
    if (k < 0) {
        return (0, Linear_1.default)(v[0], v[1], f);
    }
    else if (k > 1) {
        return (0, Linear_1.default)(v[m], v[m - 1], m - f);
    }
    else {
        return (0, Linear_1.default)(v[i], v[i + 1 > m ? m : i + 1], f - i);
    }
};
exports.default = LinearInterpolation;
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