Re: CABasicAnimation : Can I run a CABasicAnimation and get it's updated values on it's progress?
Re: CABasicAnimation : Can I run a CABasicAnimation and get it's updated values on it's progress?
- Subject: Re: CABasicAnimation : Can I run a CABasicAnimation and get it's updated values on it's progress?
- From: Matt Long <email@hidden>
- Date: Fri, 16 Jan 2009 11:50:13 -0700
There are likely some Core Audio gurus around the list that can help
you with that. I'm not terribly familiar with it. I know you can use
QTKit to load and play back audio files. The QTMovie object has a
function called - (void)setVolume:(float)volume.
-Matt
On Jan 16, 2009, at 11:39 AM, Adam Venturella wrote:
Set the volume on an Audio Queue (make a fade out/fade in)
So on the interval, I will call:
AudioQueueSetParameter (queueObject, kAudioQueueParam_Volume, value );
Where value is 0-1
On Fri, Jan 16, 2009 at 10:34 AM, Matt Long <email@hidden
> wrote:
Yes. It's what they're made for. What are you trying to do?
-Matt
On Jan 16, 2009, at 11:23 AM, Adam Venturella wrote:
So something like this would be better served with an NSTimer I
take it?
On Fri, Jan 16, 2009 at 9:54 AM, Matt Long <email@hidden
>
wrote:
Because you can't. These are the only properties you can animate:
http://developer.apple.com/DOCUMENTATION/Cocoa/Conceptual/CoreAnimation_guide/Articles/AnimProps.html
-Matt
On Jan 16, 2009, at 10:46 AM, Adam Venturella wrote:
Basically, I was thinking: Hey, why can't I use
CABasicAnimation as a
means to animate just a value, not tied to a layer or a view, eg:
If my CABasicAnimation duration is 1 second, and it's fromValue
= 0
and it's toValue = 1 and say the interval was 100 milliseconds
my value should increment by 0.10 every 100 milliseconds.
So at 5 seconds my value should be 0.50
Now I could use an NSTimer to do this same thing I suppose, but I
figured since Core Animation was already setup to handle things
like
this, why not use that.
So my question is, is this even possible? Should I stop trying
with
this approach? Not looking for a how do I do this, more of a
yes or
no answer, I would like to figure it out on my own. Just want
to make
sure I am not barking up the wrong tree to begin with.
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