arcade-physics/lib/math/Percent.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}
 */
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Work out what percentage `value` is of the range between `min` and `max`.
 * If `max` isn't given then it will return the percentage of `value` to `min`.
 *
 * You can optionally specify an `upperMax` value, which is a mid-way point in the range that represents 100%, after which the % starts to go down to zero again.
 *
 * @function Phaser.Math.Percent
 * @since 3.0.0
 *
 * @param {number} value - The value to determine the percentage of.
 * @param {number} min - The minimum value.
 * @param {number} [max] - The maximum value.
 * @param {number} [upperMax] - The mid-way point in the range that represents 100%.
 *
 * @return {number} A value between 0 and 1 representing the percentage.
 */
const Percent = (value, min, max, upperMax) => {
    if (max === undefined) {
        max = min + 1;
    }
    let percentage = (value - min) / (max - min);
    if (percentage > 1) {
        if (upperMax !== undefined) {
            percentage = (upperMax - value) / (upperMax - max);
            if (percentage < 0) {
                percentage = 0;
            }
        }
        else {
            percentage = 1;
        }
    }
    else if (percentage < 0) {
        percentage = 0;
    }
    return percentage;
};
exports.default = Percent;
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