arcade-physics/lib/geom/polygon/Perimeter.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 Length_1 = __importDefault(require("../line/Length"));
const Line_1 = __importDefault(require("../line/Line"));
/**
 * Returns the perimeter of the given Polygon.
 *
 * @function Phaser.Geom.Polygon.Perimeter
 * @since 3.12.0
 *
 * @param {Phaser.Geom.Polygon} polygon - The Polygon to get the perimeter of.
 *
 * @return {number} The perimeter of the Polygon.
 */
const Perimeter = polygon => {
    const points = polygon.points;
    let perimeter = 0;
    for (let i = 0; i < points.length; i++) {
        const pointA = points[i];
        const pointB = points[(i + 1) % points.length];
        const line = new Line_1.default(pointA.x, pointA.y, pointB.x, pointB.y);
        perimeter += (0, Length_1.default)(line);
    }
    return perimeter;
};
exports.default = Perimeter;
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