void gfxpoly_destroy(gfxpoly_t*poly);
gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly);
+gfxline_t*gfxline_from_gfxpoly_updown(gfxpoly_t*poly); // preserves up/down
gfxline_t* gfxpoly_circular_to_evenodd(gfxline_t*line, double gridsize);
gfxpoly_t* gfxpoly_createbox(double x1, double y1,double x2, double y2, double gridsize);