arcade-physics/lib/geom/line/GetNearestPoint.js

Use Arcade Physics without Phaser.

"use strict";
/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @author       Florian Mertens
 * @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 Point_1 = __importDefault(require("../point/Point"));
/**
 * Get the nearest point on a line perpendicular to the given point.
 *
 * @function Phaser.Geom.Line.GetNearestPoint
 * @since 3.16.0
 *
 * @generic {Phaser.Geom.Point} O - [out,$return]
 *
 * @param {Phaser.Geom.Line} line - The line to get the nearest point on.
 * @param {(Phaser.Geom.Point|object)} point - The point to get the nearest point to.
 * @param {(Phaser.Geom.Point|object)} [out] - An optional point, or point-like object, to store the coordinates of the nearest point on the line.
 *
 * @return {(Phaser.Geom.Point|object)} The nearest point on the line.
 */
const GetNearestPoint = (line, point, out) => {
    if (out === undefined) {
        out = new Point_1.default();
    }
    const x1 = line.x1;
    const y1 = line.y1;
    const x2 = line.x2;
    const y2 = line.y2;
    const L2 = (x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1);
    if (L2 === 0) {
        return out;
    }
    const r = ((point.x - x1) * (x2 - x1) + (point.y - y1) * (y2 - y1)) / L2;
    out.x = x1 + r * (x2 - x1);
    out.y = y1 + r * (y2 - y1);
    return out;
};
exports.default = GetNearestPoint;
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