Re: CABasicAnimation, CALayers, and rotation
Re: CABasicAnimation, CALayers, and rotation
- Subject: Re: CABasicAnimation, CALayers, and rotation
- From: David Duncan <email@hidden>
- Date: Tue, 4 Nov 2008 16:46:23 -0800
On Nov 4, 2008, at 4:30 PM, Michael A. Crawford wrote:
By default, positive angle values assigned to a rotation animation
result in counter clockwise rotation. Is there a way to cause the
rotation to occur in the clock-wise direction, with positive
values? For example, consider a needle rotating in a compass. As
the needle rotates in a clockwise direction the value that the
needle points to increases (up until it wraps around, of course).
No, Core Animation always rotates counter-clockwise (this is how the
underlying trigonometric operations work). If you want to rotate
clockwise, you will have to calculate the changes yourself. You should
also note that you can rotate outside of the unit circle (0-2π) and
get the correct value, which is useful for certain effects.
--
David Duncan
Apple DTS Animation and Printing
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