Bar Plot Animation

[Javid]

Hi,
I am sure this question has been asked in this forum several times.
But searching through this forum, I couldn't find any good examples.
I want to achieve an animation on a bar chart where it appears as the
bar grows vertically.
I tried using the CABasicAnimation with transform as key path, but I
get the following error:
<Error>: CGAffineTransformInvert: singular matrix

Here is my example code:

barPlot.transform = CATransform3DMakeScale(0.0, 0.0, 1.0);

CABasicAnimation *scaling = [CABasicAnimation
animationWithKeyPath:@"transform"];
CATransform3D transform = CATransform3DMakeScale(1.0, 1.0, 1.0);
scaling.removedOnCompletion = NO;
scaling.fillMode = kCAFillModeForwards;
scaling.toValue = [NSValue valueWithCATransform3D:transform];
scaling.duration = 5.0f;
[graph addAnimation:scaling forKey:@"scaling"];

I am pretty sure the error is because of me setting 0.0, the initial
barPlot transform.

Should I be using the frame CGRect bounds to achieve what I am trying
to do?
Any code samples would be very helpful.

Thanks,
Javid

[Drew McCormack]

I haven't tried this, but one problem I see is that your scaling is wrong. Try starting with a scaling of (1.0, 0.01, 1.0).
Another way to animate it would be to use a translation transform.

Drew

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[Javid]

Hi Drew,
The scaling with 0.01 didn't work. The only time the scaling animation
seems to work is if I set the scale transform to a higher value than
1.0 in my CABasicAnimation block.
For example the code below doesnt work

barPlot.transform = CATransform3DMakeScale(1.0, 0.1, 1.0);

CABasicAnimation *scaling = [CABasicAnimation
animationWithKeyPath:@"transform"];
CATransform3D transform = CATransform3DMakeScale(1.0, 1.0, 1.0);
scaling.removedOnCompletion = NO;
scaling.fillMode = kCAFillModeForwards;
scaling.toValue = [NSValue valueWithCATransform3D:transform];
scaling.duration = 5.0f;
[graph addAnimation:scaling forKey:@"scaling"];

If the transform to value is greater than 1.0 and my initial transform
in 1.0, then there is some animation happening.

Unfortunately, I am not an expert in Animation and not sure how to
proceed.

I wanted to try your suggestion to use translation. My question is
what are the values I should be passing as arguments to the function
CATranform3DMakeTranslation ?

Thanks,
Javid

[Javid]

Ok. I managed to get the animation to work to an extent that I feel is
sufficient for my application.
Instead of using CATransform3DMakeScale, I set the fromValue and
toValue to 0.0 and 1.0 respectively.
This animated the bar plot to scale from the center, so i moved the
anchor point of bar plot to 0,0 and the bar now animates vertically

here is the code:
barPlot.anchorPoint = CGPointMake(0.0, 0.0); // Moved anchor point,
initially it was set to center 0.5

CABasicAnimation *scaling = [CABasicAnimation
animationWithKeyPath:@"transform.scale.y"]; // scaling only on the y
axis
scaling.fromValue = [NSNumber numberWithFloat:0.0];
scaling.toValue = [NSNumber numberWithFloat:1.0];
scaling.duration = 3.0f; // Duration

scaling.removedOnCompletion = NO;
scaling.fillMode = kCAFillModeForwards;

[barPlot addAnimation:scaling forKey:@"scaling"];

[TrialAccount Test]

Hii...
While Animating Bar plot i.e., when bar grows vertically i want to update the DataLabelForPlot values.How can I achieve this.

Thanks
Charlene.