/* conversion functions */
gfxpoly_t* gfxpoly_createbox(double x1, double y1,double x2, double y2, double gridsize);
gfxline_t* gfxline_from_gfxpoly(gfxpoly_t*poly);
/* conversion functions */
gfxpoly_t* gfxpoly_createbox(double x1, double y1,double x2, double y2, double gridsize);
gfxline_t* gfxline_from_gfxpoly(gfxpoly_t*poly);