@woosh/meep-engine/src/core/geom/2d/aabb/aabb2_compute_overlap.js

Pure JavaScript game engine. Fully featured and production ready.

import { max2 } from "../../../math/max2.js";
import { min2 } from "../../../math/min2.js";

/**
 *
 * @param {number} ax0
 * @param {number} ay0
 * @param {number} ax1
 * @param {number} ay1
 * @param {number} bx0
 * @param {number} by0
 * @param {number} bx1
 * @param {number} by1
 * @param {AABB2} result
 * @returns {boolean} true if overlap exists, false if no overlap
 */
export function aabb2_compute_overlap(
    ax0, ay0, ax1, ay1,
    bx0, by0, bx1, by1,
    result
) {

    const x0 = max2(ax0, bx0);
    const x1 = min2(ax1, bx1);

    if (x0 >= x1) {
        //no overlap
        return false;
    }

    const y0 = max2(ay0, by0);
    const y1 = min2(ay1, by1);

    if (y0 >= y1) {
        //no overlap
        return false;
    }

    result.set(x0, y0, x1, y1);

    return true;
}