On 24-Oct-08, at 10:50 PM, Michael A. Crawford wrote:
I need to learn how to take three or four Core-Animation layers and
composite them on onto one another while animating, in order to
simulate a complex gauge. I'm assuming this will be a lot easier
than it is in Windows.
The different elements (needles and such) of the gauge will be on
their own layer and will animate by rotating around the center.
Additionally, I need for most of the layer to be transparent except
for the gauge elements. Any example code you can point to that will
help me to assemble these different functional elements would be
greatly appreciated.
I'm guessing you mean a gauge like the one shown in the doc in this
article?
http://developer.apple.com/documentation/GraphicsImaging/Conceptual/Animation_Overview/MacOSXAnimTech/chapter_4_section_2.html#/
/apple_ref/doc/uid/TP40004952-CH6-SW4
This is the code I used to generate the movie that movie. It was
written specifically to make that QuickTime movie, nothing more.
This hasn't been touched in more than a year except to add the
disclaimer and to make sure it still compiles. It may leak. But it'll
give you some ideas.
http://www.abandoninplace.com/blog/2008/10/simple-core-animation-meter-vi.html
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