2012/9/19 Josh Andler <scislac@...400...>:
I think that if we are going to break compatibility, we go for one release to do it. Basically, all of the new-style stuff including custom doc coords would be a huge win to introduce all at once. I would love to see a rotatable canvas in Inkscape, but I have no idea how feasible it is with the current rendering/viewport stuff we have in place.
In principle it should be possible to change doc2dt and dt2doc matrices to any transform without any modifications to the display subsystem, but it might expose bugs - mainly hidden assumptions that doc2dt is always an Y flip + translation.
The code drawing the page background will need to be rewritten, as it now assumes that the page is a rectangle with sides parallel to desktop coordinate system axes.
Regards, Krzysztof