I don't know enough about the specifics, but could an image with a moving mask reveal the trail?
Eric On Thu, Feb 25, 2010 at 8:32 PM, David Duncan <david.dun...@apple.com>wrote: > On Feb 25, 2010, at 4:55 PM, John Michael Zorko wrote: > > > I'm interested in having a CAKeyframeAnimation leave a "trail" i.e. > imagine the image of a pencil being animated across the screen -- I want to > draw a path of where the pencil has been along with the animated pencil. > However, i'm not sure how to do this, since Core Animation is doing the > drawing for me. If anyone can offer some pointers, i'd be quite appreciative > :-) > > > There isn't a simple way to do this on iPhone OS – the class that would > make it simpler (CAEmitterLayer) is not available. > > There are various approaches that all involve doing the work yourself, > which means breaking the path apart into its components (CGPathApply) and > doing the interpolation yourself. > -- > David Duncan > Apple DTS Animation and Printing > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/edolecki%40gmail.com > > This email sent to edole...@gmail.com > -- http://ericd.net Interactive design and development _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
