NSAffineTransform
NSAffineTransform
- Subject: NSAffineTransform
- From: Jim Beard <email@hidden>
- Date: Wed, 6 Feb 2002 10:06:40 -0800
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Howdy,
I've been trying to teach myself some of the graphical sides of
cocoa, and lately I've been having trouble trying to rotate a
NSBezierPath with NSAffineTransform. I understand that
- -rotateByDegrees: will rotate around the origin. So to rotate it in
place the transform must first -tranlateXBy: yBy: to the origin, then
apply the -rotateByDegrees: and finally translate back. The problem I'm
having is that after the rotation is applied, the translation back to
the source location seems to travel along a rotated axis. So it isn't
going back to where it came from, it continues on towards where it would
have ended up had I only rotated it.
I've been establishing the NSAffineTransform like so:
[direction translateXBy:-thing_x yBy:-thing_y];
[direction rotateByDegrees:angle];
[direction translateXBy:thing_x yBy:thing_y];
Then drawing applying / drawing like this:
[[direction transformBezierPath:thing] fill];
I also tried making the translation back a second NSAffineTransform and
applying separately with no luck. Is there something I'm missing? I've
been using the Hillegass book and apple's site as references, but I
haven't been able to find many samples of rotated transforms.
Jim
___________________________________
Jim Beard
Masters Student in CS @ U of Oregon
~
PGP Public Key:
http://www.cs.uoregon.edu/~jim/pgp.html
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