Preliminary algorithm is to get the convex hull of any point, then in accordance with the LWPOLYLINE1 point of order, if LWPOLYLINE1 and LWPOLYLINE2 have intersection, turn to LWPOLYLINE2 point, according to LWPOLYLINE2, if LWPOLYLINE2 and LWPOLYLINE1 have intersection, turn to LWPOLYLINE1 point, return to the origin.