Wher reading Ulfs answer a little more carefully I thinks that it's just what he is sugesting. *smile*
/John tor 2007-04-19 klockan 12:31 +0200 skrev John Eriksson: > But maybe it'll work if you first rotate the imagedata around the > centerpoint using pygame.transform.rotate(...) and then rotate the > centerpoint around the wanted rotation point? Havn't tried it yet > though. Sounds reasonably but what do you think? > > /John > > tor 2007-04-19 klockan 12:24 +0200 skrev altern: > > john is talking about the actual image surface data not just the sprite > > location. i guess you might need something like PIL library, but i would > > not really know how to do this. > > > > John Eriksson(e)k dio: > > > But that is not what I'm trying to do.I want to rotate the actual > > > imagedata (like rotating an image using PohotSshop or GIMP). Not just > > > the location where the image is drawn. > > > > > > The pygame.transform.rotate(...) function does that but always rotates > > > the imagedata about it's center. > > > > > > /John > > > > > > tor 2007-04-19 klockan 11:02 +0200 skrev Ulf Ekström: > > >> On 4/19/07, John Eriksson <[EMAIL PROTECTED]> wrote: > > >>> Well, no. > > >>> > > >>> I'm looking for a way to rotate the imagedata (like > > >>> pygame.transform.rotate(...)) but your example rotates the image > > >>> location. Right? > > >> It is actually the same thing. Rotation around some arbitrary point > > >> can be decomposed into a rotation around some other point followed by > > >> a translation. Suppose you have a function R which rotates things > > >> around the origin. To write a function Rp which rotates around the > > >> point p (p and q are vectors), you do > > >> > > >> Rp(q) = R(q-p)+p > > >> > > >> Since R is a linear function you can do > > >> > > >> Rp(q) = R(q) + p - R(p) > > >> > > >> So rotating around p is the same as rotating around the origin and > > >> then translating by p - R(p). > > >> > > >> Ulf > > > > > >
