Hello,
I'm beginning to delve into Core Animation, and am trying to implement
what (I think) should be a very simple effect. I want to rotate a
50x50 layer around an axis defined by one of the edges which is fixed.
The best analogy is looking down on a book and turning a page, the
edge of the page being fixed in the binding. I have this so far:
CGFloat angle = DegreesToRadians(-180);
CATransform3D transform = CATransform3DIdentity;
layer.anchorPoint = CGPointMake(1.0, 0.5); // turn page to right
transform = CATransform3DRotate(transform, angle, 0, 1, 0); // y-axis
rotation
transform = CATransform3DTranslate(transform, -25, 0, 0);
transform.m34 = 0.01f; // for pretty 3D effect
layer.transform = transform;
This is close in that the final and initial states are right, but the
translation I added to get that makes the "page" move off the binding
in the process. Also, why is the value -25 the right one to move the
layer to the right position? I would have thought that it would be -50
(i.e. the width).
Any help greatly appreciated!
Cheers,
Demitri
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