(Note: I apologize for not having this nicely formatted. My previous
message - 8kB over the size limit - was rejected because it was too
large, so I had to remove the extra HTML)
I have a CAKeyframeAnimation that simply will not work.
I have a layer. When I apply a CABasicAnimation to it, it animated
exactly as expected. When I apply the keyframe animation, it doesn't...
Here's the code for the keyframe animation:
+ (CAAnimation*) randomPathAnimationWithBounds:(CGRect)inBounds
keyFrames:(UInt32)inKeys layer:(CALayer*)inLayer duration:(CGFloat)
duration {
// Setup our variables for keeping track of points and relative timings
CGPoint points[inKeys] ;
CGFloat timing[inKeys+1] ;
timing[inKeys] = CKRandomRange(1000) ; // CKRandomRange(range) is
the same as random()%range
CGFloat total = timing[inKeys] ; // Keep a running tally of our
total int count for later normalization
// This will produce a random point putting the layer somewhere
outside the parent's bounds, supplied to us as bounds
CGPoint r1 = [self randomPointForLayer:inLayer outOfBounds:inBounds] ;
inLayer.position = r1 ; // apply the initial position
// Make our arrays
NSMutableArray * locArr = [NSMutableArray arrayWithCapacity:inKeys+1] ;
NSMutableArray * timArr = [NSMutableArray arrayWithCapacity:inKeys+1] ;
UInt32 i ;
for ( i=0 ; i<inKeys ; i++ )
{
// Get timing
timing[i] = CKRandomRange(1000) ; // Make a new random relative
timing
total += timing[i] ; // add it to the running tally
// Get some random point inside the bounds
points[i] = CGPointMake ( CKRandomRange(inBounds.size.width)
+inBounds.origin.x , CKRandomRange(inBounds.size.height)
+inBounds.origin.y ) ;
// Add that point to the location array
[ locArr addObject: [NSValue valueWithCGPoint:points[i]] ] ;
}
// Get an endpoint, outside the bounds, and add it to the array
CGPoint r2 = [self randomPointForLayer:inLayer outOfBounds:inBounds] ;
[locArr addObject:[NSValue valueWithCGPoint:r2]] ;
// Normalize the timings, comulative
timing[0] = timing[0] / total * duration ;
for ( i=1 ; i<inKeys+1 ; i++ )
timing[i] = timing[i] / total * duration + timing[i-1] ;
// Fill the timing value array
for ( i=0 ; i<inKeys+1 ; i++ )
[timArr addObject:[NSNumber numberWithFloat:timing[i]]] ;
// Make the animation
CAKeyframeAnimation * animation = [CAKeyframeAnimation
animationWithKeyPath:@"position"] ;
animation.values = locArr ;
animation.duration = duration ;
animation.calculationMode = kCAAnimationLinear ;
animation.keyTimes = timArr ;
animation.fillMode = kCAFillModeForwards ;
// Print stuff
NSLog ( @"%@" , animation ) ;
NSLog ( @" --> %lu, %lu" , locArr.count , timArr.count ) ;
NSLog ( @" --> %@" , animation.keyTimes ) ;
NSLog ( @" --> %@" , animation.values ) ;
return animation ;
}
The output, from the print statements, to show that it has VALID
values, is:
2009-10-01 13:11:00.887 Whose Line[56132:207] <CAKeyframeAnimation:
0x3921510>
2009-10-01 13:11:00.888 Whose Line[56132:207] --> 11, 11
2009-10-01 13:11:00.888 Whose Line[56132:207] --> (
0.178501,
0.4809336,
0.5841551,
0.8514135,
0.9723865,
1.163051,
1.258054,
1.540105,
1.850756,
1.916502,
2
)
2009-10-01 13:11:00.888 Whose Line[56132:207] --> (
NSPoint: {437, 159},
NSPoint: {30, 0},
NSPoint: {446, 272},
NSPoint: {398, 21},
NSPoint: {469, 117},
NSPoint: {377, 111},
NSPoint: {84, 95},
NSPoint: {101, 111},
NSPoint: {291, 138},
NSPoint: {359, 237},
NSPoint: {7, -12}
)
The timings look right - the duration was set to 2 seconds... So
they're all in order and randomly spaced.
The positions are also all inside the bounds (iPhone landscape, full
screen @ 480x320)
However, when I add the animation, nothing happens...
Any ideas would be greatly appreciated!
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