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Bug in NSAffineTransform
From: |
tima |
Subject: |
Bug in NSAffineTransform |
Date: |
Wed, 22 Feb 2006 23:24:21 -0800 |
User-agent: |
Mail/News 1.5 (X11/20060219) |
Hello list,
After a long break I upgraded to latest gnustep release (gui-0.10.2) and
the image rotation in PhotoClip stopped working.
I figured out this was because of [NSAffineTransform -translateXBy: yBy]
that was changed in gui-0.10.0 to
- (void) translateXBy: (float)tranX yBy: (float)tranY
{
NSAffineTransformStruct tranm = identityTransform;
tranm.tX = tranX;
tranm.tY = tranY;
matrix = matrix_multiply(tranm, matrix); // problem
}
The matrix multiplication is not commutative and the last line should be
instead
matrix = matrix_multiply(matrix, tranm);
I prefer the old version though:
- (void) translateXBy: (float)tranX yBy: (float)tranY
{
TX += tranX;
TY += tranY;
}
it's clearer and faster.
Can someone please update CVS?
Thank you,
Tima.
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