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

Plugins of phaser4

/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2019 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */

import LineToCircle from './LineToCircle.js';
import Contains from '../triangle/Contains.js';

/**
 * Checks if a Triangle and a Circle intersect.
 *
 * A Circle intersects a Triangle if its center is located within it or if any of the Triangle's sides intersect the Circle. As such, the Triangle and the Circle are considered "solid" for the intersection.
 *
 * @function Phaser.Geom.Intersects.TriangleToCircle
 * @since 3.0.0
 *
 * @param {Phaser.Geom.Triangle} triangle - The Triangle to check for intersection.
 * @param {Phaser.Geom.Circle} circle - The Circle to check for intersection.
 *
 * @return {boolean} `true` if the Triangle and the `Circle` intersect, otherwise `false`.
 */
var TriangleToCircle = function (triangle, circle) {
    //  First the cheapest ones:

    if (
        triangle.left > circle.right ||
        triangle.right < circle.left ||
        triangle.top > circle.bottom ||
        triangle.bottom < circle.top) {
        return false;
    }

    if (Contains(triangle, circle.x, circle.y)) {
        return true;
    }

    if (LineToCircle(triangle.getLineA(), circle)) {
        return true;
    }

    if (LineToCircle(triangle.getLineB(), circle)) {
        return true;
    }

    if (LineToCircle(triangle.getLineC(), circle)) {
        return true;
    }

    return false;
};

export default TriangleToCircle;