Re: [iPhone 3.1] Core Animation that leaves a trial?
Re: [iPhone 3.1] Core Animation that leaves a trial?
- Subject: Re: [iPhone 3.1] Core Animation that leaves a trial?
- From: "Eric E. Dolecki" <email@hidden>
- Date: Thu, 25 Feb 2010 23:13:32 -0500
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 <email@hidden>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
>
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--
http://ericd.net
Interactive design and development
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