Concatenation is just a matrix multiplication:
http://developer.apple.com/documentation/graphicsimaging/Conceptual/drawingwithquartz2d/dq_affine/dq_affine.html#/
/apple_ref/doc/uid/TP30001066-CH204-CJBECIAD
So yes, you can do that.
It's just a matter of taste, but I would write it like that instead:
CGAffineTransform transform = CGAffineTransformMakeScale(1.5, 1.5);
transform = CGAffineTransformRotate(transform, 3.14);
transform = CGAffineTransformTranslate(transform, 100, 50);
square.transform = transform;
Le 17 juin 09 à 11:37, Chunk 1978 a écrit :
CGAffineTransformConcat() only allow for 2 arguments. so in the case
where i have 3 transforms, i had to concatenate the first 2 to make
"Group1", and then concatenate that with the final transform:
-=-=-=-
//Animation Block
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:.5];
[UIView setAnimationDelegate:self];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
CGAffineTransform enlarge = CGAffineTransformMakeScale(1.5, 1.5);
CGAffineTransform rotate = CGAffineTransformMakeRotation(3.14);
CGAffineTransform group1 = CGAffineTransformConcat(enlarge, rotate);
CGAffineTransform move = CGAffineTransformMakeTranslation(100, 50);
square.transform = CGAffineTransformConcat(group1, move);
[UIView commitAnimations];
-=-=-=-
it seems to work find, but is this the most ideal way of doing this?
On Wed, Jun 17, 2009 at 5:21 AM, Chunk 1978<chunk1...@gmail.com>
wrote:
thanks! :)
On Wed, Jun 17, 2009 at 5:05 AM, Jean-Daniel
Dupas<devli...@shadowlab.org> wrote:
Le 17 juin 09 à 10:53, Chunk 1978 a écrit :
is have this animation block with both Enlarge and Rotate, but only
one work properly (the last one listed). what is the proper way to
group the two transforms together:
-=-=-=-
//Animation Block
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.0];
[UIView setAnimationDelegate:self];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
CGAffineTransform enlarge =
CGAffineTransformMakeScale(1.5, 1.5);
CGAffineTransform rotate =
CGAffineTransformMakeRotation(3.14 / 2);
square.transform = enlarge;
square.transform = rotate;
[UIView commitAnimations];
-=-=-=-
You should concat your transformations, not make two.
CGAffineTransform trans = CGAffineTransformMakeScale(1.5,
1.5);
trans = CGAffineTransformRotate(trans, 3.14 / 2);
or in your sample above:
square.transform = CGAffineTransformConcat(enlarge, rotate);
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