phaser4-rex-plugins/plugins/utils/geom/intersects/GetTriangleToLine.js

Plugins of phaser4

/**
 * @author       Florian Vazelle
 * @author       Geoffrey Glaive
 * @copyright    2019 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */

import Point from '../point/Point.js';
import TriangleToLine from './TriangleToLine.js';
import LineToLine from './LineToLine.js';

/**
 * Checks if a Triangle and a Line intersect, and returns the intersection points as a Point object array.
 *
 * The Line intersects the Triangle if it starts inside of it, ends inside of it, or crosses any of the Triangle's sides. Thus, the Triangle is considered "solid".
 *
 * @function Phaser.Geom.Intersects.GetTriangleToLine
 * @since 3.0.0
 *
 * @param {Phaser.Geom.Triangle} triangle - The Triangle to check with.
 * @param {Phaser.Geom.Line} line - The Line to check with.
 * @param {array} [out] - An optional array in which to store the points of intersection.
 *
 * @return {array} An array with the points of intersection if objects intersect, otherwise an empty array.
 */
var GetTriangleToLine = function (triangle, line, out) {
    if (out === undefined) { out = []; }

    if (TriangleToLine(triangle, line)) {
        var lineA = triangle.getLineA();
        var lineB = triangle.getLineB();
        var lineC = triangle.getLineC();

        var output = [new Point(), new Point(), new Point()];

        var result = [
            LineToLine(lineA, line, output[0]),
            LineToLine(lineB, line, output[1]),
            LineToLine(lineC, line, output[2])
        ];

        for (var i = 0; i < 3; i++) {
            if (result[i]) { out.push(output[i]); }
        }
    }

    return out;
};

export default GetTriangleToLine;