gistfile1.m

@implementation _CPWindowFrameAnimation : CPAnimation
{
    CPWindow    _window;
    
    CGRect      _startFrame;
    CGRect      _targetFrame;
}

- (id)initWithWindow:(CPWindow)aWindow targetFrame:(CGRect)aTargetFrame
{
    var windowFrame = [aWindow frame],
        deltaX = ABS(windowFrame.origin.x - aTargetFrame.origin.x),
        deltaY = ABS(windowFrame.origin.y - aTargetFrame.origin.y),
        deltaHeight = ABS(windowFrame.size.height - aTargetFrame.size.height),
        deltaWidth = ABS(windowFrame.size.width - aTargetFrame.width),
        delta = MAX(MAX(deltaX, deltaY), MAX(deltaHeight, deltaWidth)),
        duration = MAX(0.2, MIN(0.4, delta * 0.0004));
    console.log("asd");    
    self = [super initWithDuration: duration  animationCurve:CPAnimationLinear];
    
    if (self)
    {
        _window = aWindow;
        
        _targetFrame = CGRectMakeCopy(aTargetFrame);
        _startFrame = CGRectMakeCopy([_window frame]);
    }
    
    return self;
}

- (void)startAnimation
{
    [super startAnimation];
    
    _window._isAnimating = YES;
}

- (void)setCurrentProgress:(float)aProgress
{
    [super setCurrentProgress:aProgress];
    
    var value = [self currentValue];
    
    if (value == 1.0)
        _window._isAnimating = NO;
    
    [_window setFrameOrigin:CGPointMake(interpolate(CGRectGetMinX(_startFrame), CGRectGetMinX(_targetFrame), value), interpolate(CGRectGetMinY(_startFrame), CGRectGetMinY(_targetFrame), value))];
    [_window setFrameSize:CGSizeMake(interpolate(CGRectGetWidth(_startFrame), CGRectGetWidth(_targetFrame), value), interpolate(CGRectGetHeight(_startFrame), CGRectGetHeight(_targetFrame), value))];
}

@end