I'm trying to get a handle on how changing the frame of a layer affects its
frame while a transform is specified. During this, I noticed something weird,
and I just can't figure it out.
In the documentation:
"When a new frame rectangle is specified the bounds origin is undisturbed,
while the bounds size is set to the size of the frame."
However, I'm not seeing this as being the case.
// Step 1 --------------------
CALayer * layer = [CALayer layer];
layer.frame = CGRectMake(50, 50, 500, 500);
// Step 2 --------------------
layer.transform = CATransform3DMakeRotation(M_PI_4, 0, 0, 1.0);
// frame: {{-53.5…, -53.5…}, {707.1…, 707.1…}}
// bounds: {{0, 0}, {500, 500}}
// Step 3 --------------------
layer.frame = layer.frame;
// frame: {{-53.5…, -53.5…}, {707.1…, 707.1…}}
// bounds: {{0, 0}, {1000, 0}}
So first of all, I find it a bit odd that setting the frame to its current
value changes the bounds at all, but I can imagine that it somehow makes sense
given the transform is applied. But more importantly, how does it make any
sense that the bounds is changing size to 1000 x 0?
See it in action:
http://www.sethwillits.com/temp/CATransformDemo.mov
Can anyone explain what's going on?
--
Seth Willits
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