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
