Re: gEDA-user: PCB view solder side

[Bill WIlson <billw@xxxxxxxxxxxxxx>]

On Tue, 2 May 2006 16:31:22 -0400
DJ Delorie <dj@xxxxxxxxxxx> wrote:

> 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.

Then the core is currently defining the flip direction.  Shouldn't the macros
SWAP_SIGN then be replaced with HID functions so the gui can be
in control?