Question: does your view actually have a "depth" in the z dimension
or is it just a plane with x and y measurement and a z (depth) of
0.0. If you scale something with a size of zero, you'll produce no
visible results. If you want the position of one layer to change,
relative to another, you'll have to change the z coordinate, not scale
it.
On Oct 14, 2009, at 1:45 PM, ChrisOutwin wrote:
My Core Animation application correctly scales a CALayer's x and y
axes but does nothing to change the layer's visual position relative
to sibling layers when the z scaling factor is changed in the UI.
The debugger and NSLog both indicate that element m33 of the
CATransform3D structure change to reflect the value from the UI.
Setting element m34 to 1.0 / -850 to create a perspective transform
does nothing.
I've carefully read the Layer Geometry and Transformation section
of the Core Animation Programming Guide. The only example I've
found (CALayerExample) uses CATransform3DMakeScale, but sets 1.0 as
the argument for the z-axis parameter. (When I edited this example
code to make all of the arguments the same, the CALayer did not
change on the z-axis.)
Is there an example which scales a CALayer on the z-axis? I've
worked for two days trying to get this. What am I missing?
Thank you very much.
Chris Outwin
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