windowShake

- (CAKeyframeAnimation *)negativeShake:(NSRect)frame{
	int numberOfShakes = 4;
	float durationOfShake = 0.5f;
	float vigourOfShake = 0.05f;
	
    CAKeyframeAnimation *shakeAnim = [CAKeyframeAnimation animation];
	
    CGMutablePathRef shakePath = CGPathCreateMutable();
    CGPathMoveToPoint(shakePath, NULL, NSMinX(frame), NSMinY(frame));
	int index;
	for (index = 0; index < numberOfShakes; ++index)
	{
		CGPathAddLineToPoint(shakePath, NULL, NSMinX(frame) - frame.size.width * vigourOfShake, NSMinY(frame));
		CGPathAddLineToPoint(shakePath, NULL, NSMinX(frame) + frame.size.width * vigourOfShake, NSMinY(frame));		
	}
    CGPathCloseSubpath(shakePath);
    shakeAnim.path = shakePath;
    shakeAnim.duration = durationOfShake;
    return shakeAnim;
}

- (IBAction)shakeBabyShake:(id)sender;
{
	NSString *key = @"frameOrigin";
#if __i386__
	if ([NSView defaultAnimationForKey:key] == nil){
#elif __x86_64__
	if ([NSWindow defaultAnimationForKey:key] == nil){
#endif		
		NSLog(@"NSVindow not animatable for key '%@'",key);		
	}else {
		[[NSApp keyWindow] setAnimations:[NSDictionary dictionaryWithObject:[self negativeShake:[[NSApp keyWindow] frame]] forKey:key]];
		[[[NSApp keyWindow] animator] setFrameOrigin:[[NSApp keyWindow] frame].origin];		
	}	
}