Re: Non Linear CAAnimation of properties
Re: Non Linear CAAnimation of properties
- Subject: Re: Non Linear CAAnimation of properties
- From: Bill Dudney <email@hidden>
- Date: Mon, 19 Nov 2007 21:59:33 -0700
Hi Bertrand,
If I understand correctly you want a CAAnimationGroup to get your
position and zPosition properties to animate at the same time (I've
only done this on a layer backed view myself but it should work).
Here is the basic code that I'm using;
- (CAAnimation *)frameAnimation:(NSRect)aniFrame {
CAKeyframeAnimation *frameAnimation = [CAKeyframeAnimation
animationWithKeyPath:@"frame"];
NSRect start = aniFrame;
NSRect end = NSInsetRect(aniFrame, -NSWidth(start) * 0.50, -
NSHeight(start) * 0.50);
frameAnimation.values = [NSArray arrayWithObjects:
[NSValue valueWithRect:start],
[NSValue valueWithRect:end], nil];
return frameAnimation;
}
- (CABasicAnimation *)rotationAnimation {
CABasicAnimation *rotation = [CABasicAnimation
animationWithKeyPath:@"frameRotation"];
rotation.fromValue = [NSNumber numberWithFloat:0.0f];
rotation.toValue = [NSNumber numberWithFloat:45.0f];
return rotation;
}
- (CAAnimationGroup *)groupAnimation:(NSRect)frame {
CAAnimationGroup *group = [CAAnimationGroup animation];
group.animations = [NSArray arrayWithObjects:
[self frameAnimation:frame],
[self rotationAnimation], nil];
group.duration = 1.0f;
group.autoreverses = YES;
return group;
}
- (id)initWithFrame:(NSRect)rect {
...
NSDictionary *animations = [NSDictionary
dictionaryWithObjectsAndKeys:
[self groupAnimation:[view
frame]], @"frameRotation",
nil];
...
[view setAnimations:animations];
...
}
...
- (void)someEventMethod {
// since the animation auto reverses this works fine (if it
did not auto revers we'd
//need to make sure that final rotation angle matched what is in the
animation or we'd get jumpy movement)
[[movingView animator] setFrameRotation:[movingView
frameRotation]];
}
I you should attach your keyframe animation with a CGPath to the
position property and a basic animation to the zPosition. Then you can
put both in a group then attach the group to the zPosition. Then when
you set the zPosition for the layer it will animate both properties.
Some stuff to be aware of just in case you've not messed with groups
before;
- the animations you put in the group have to be tied to the property
they will be animating (i.e. use animationWithKeyPath: instead of
animation)
- be aware that the final zPosition that you set should match the
final position of the zPosition animation
I have been able to animate the size of a view and a layer with a
CGPath, the x values mapped to the width and y values to the height. I
could not find the code right now but it was the same kind of thing.
All i had to do was tie the keyframe animation to the frameSize
property.
HTH,
-bd-
http://bill.dudney.net/roller/objc
Hi List,
I'm trying to animate X and Z on a curve (rotating image a bit like
front row does). I can get the position correctly and have it linearly
animated from one position to the other, but i'd rather have it curve
a bit before since it would feel more natural than a straight line.
I thought the easiest way would be to use CAKeyframeAnimation and give
it a CGPath to follow. But it feels like that only works for animating
the position attribute or at least only for CGPoint attributes. Is
that the case ?
So I tried creating my own CGPoint and have it set the position and
zPosition. But my new attribute does not get animated. Not even the
default basic animation. What needs to be done for a property of a
subclass of CALayer to be animatable ?
Thanks.
Bertrand.
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