I have come back to GDL after a couple of years and my first project is a custom window. I decided to use the opportunity to refresh my GDL so I went step by step through orientating a window via placement, using the ref line and mirrored/flipped to establish UV etc. What I found was that the copy/paste from the manual.
! 2D script bRotated = round_int (SYMB_ROTANGLE) = 180 if bRotated then rot2 180 endif if SYMB_MIRRORED then mul2 -1, 1 endif if WIDO_REVEAL_SIDE exor bRotated then add2
When I did the same using circles etc to draft the orientation I get
I searched the forum but did not easily find essential info or bug reports on this.