It's special-casing multiples of 90 since at least 1.7.1, from what I read in the source.
In fact, there looks to be a subtle bug in how it detects them, but I'll make a separate post for that. -FM On 6/10/08, Terry Hancock <[EMAIL PROTECTED]> wrote: > What's the best way to do (exact) 90-degree rotations in PyGame? > > There doesn't seem to be a separate "transpose" operation in the > "transform" module (I.e. an operation that swaps x & y coordinates). > > Does the "rotate" function special-case 90-degree interval rotations? > > Or is it more efficient to convert a PyGame Surface to a Python Imaging > Library image and then transpose that? (PIL does have a separate > "transpose" method). > > How efficient can this be? If I need to get a mirror image or a > transposition of an existing surface (say a full-screen 1024x768 image), > is it worth caching the result to disk? Or would it be faster to just > flip it in memory whenever I need it? (IOW, how does a 90-degree > rotation or a "flip" compare to a disk I/O on most computers?) > > BTW, I tried to look this up, but I can't find a discussion of it in the > documentation, and wasn't sure how to look it up in the ML archives. > > Thanks, > Terry > > -- > Terry Hancock ([EMAIL PROTECTED]) > Anansi Spaceworks http://www.AnansiSpaceworks.com > >
