double x = ((p2.x * p1.y - p1.x * p2.y) * (p4.x - p3.x) - (p4.x * p3.y - p3.x * p4.y) * (p2.x - p1.x)) / ((p2.x - p1.x) * (p4.y - p3.y) - (p4.x - p3.x) * (p2.y - p1.y));
        double y = ((p2.x * p1.y - p1.x * p2.y) * (p4.y - p3.y) - (p4.x * p3.y - p3.x * p4.y) * (p2.y - p1.y)) / ((p2.x - p1.x) * (p4.y - p3.y) - (p4.x - p3.x) * (p2.y - p1.y));