Function intersect

library/include/Types.h:101–107

    typedef std::pair<df::coord2d, df::coord2d> rect2d;

    inline rect2d intersect(rect2d a, rect2d b) {
        df::coord2d g1 = a.first, g2 = a.second;
        df::coord2d c1 = b.first, c2 = b.second;
        df::coord2d rc1 = df::coord2d(std::max(g1.x, c1.x), std::max(g1.y, c1.y));
        df::coord2d rc2 = df::coord2d(std::min(g2.x, c2.x), std::min(g2.y, c2.y));
        return rect2d(rc1, rc2);
    }

    inline rect2d mkrect_xy(int x1, int y1, int x2, int y2) {
        return rect2d(df::coord2d(x1, y1), df::coord2d(x2, y2));