Re: gEDA-user: PCB view solder side

[DJ Delorie <dj@xxxxxxxxxxx>]

> This conflicts with the gui and I think the SWAP_SIGN stuff needs to
> be removed.  Is that so DJ and Dan?

If the core knows it's drawing on the solder side of the board, it
needs to swap the signs of the *board* coordinates it's using, so that
on the physical board it reads correctly.

If the GUI happens to be showing the board from that side, it would
re-flip it so it reads correctly on the screen.  If not, it would
remain flipped and read backwards on the screen.

I think what Tamas is complaining about is that the core swaps the Y
coordinate, but Gtk swaps the X coordinate, so even when you're
looking at the correct side of the board, the text is not mirrored
but is upside-down.

I'm not sure there's a good way to manage this, other than rotating
the parts 180 degrees after flipping them.  Eventually the GUIs will
support both X and Y axis board flipping (and perhaps board rotating
too), so no single "default" element flip will be sufficient.

And if all this confuses you, that only means you're paying attention.
It's confusing.  The rule is: nothing in the "core" space should know
about SCREEN COORDINATES (i.e. zoom, pan, flip view).  That doesn't
preclude confusing calculations on BOARD COORDINATES, such as flipping
text or elements to put them on the other side of the board, or
rotating them.