arcade-physics/lib/geom/line/GetNormal.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 const_1 = __importDefault(require("../../math/const"));
const Angle_1 = __importDefault(require("./Angle"));
const Point_1 = __importDefault(require("../point/Point"));
/**
 * Calculate the normal of the given line.
 *
 * The normal of a line is a vector that points perpendicular from it.
 *
 * @function Phaser.Geom.Line.GetNormal
 * @since 3.0.0
 *
 * @generic {Phaser.Geom.Point} O - [out,$return]
 *
 * @param {Phaser.Geom.Line} line - The line to calculate the normal of.
 * @param {(Phaser.Geom.Point|object)} [out] - An optional point object to store the normal in.
 *
 * @return {(Phaser.Geom.Point|object)} The normal of the Line.
 */
const GetNormal = (line, out) => {
    if (out === undefined) {
        out = new Point_1.default();
    }
    const a = (0, Angle_1.default)(line) - const_1.default.TAU;
    out.x = Math.cos(a);
    out.y = Math.sin(a);
    return out;
};
exports.default = GetNormal;
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