Combining Canvas subclasses for Animation

Hi,
I need to have some sort of surface on which I can put movable objects in order to create an animated visualization.
I thought of subclassing Canvas for:
a) having an AnimationCanvas that contains a Vector of objects
b) having movable objects (let's call them AnimationItem) that can draw themselves.
Now I have some problems which I wasn't able to solve yet:
a) How do I make an AnimationItem draw not onto itself but onto the AnimationCanvas object?
b) I'm getting Null Pointer Exceptions at the moment, when trying to create an offscreen Image for double buffering. I tried to put a private Image and a private Graphics object inside each AnimationItem, then create those in the constructor.
I'm a little stuck with this graphics stuff, can anyone help me?
Thanks,
Robert

Man that could really be better, but I'm not even close to understand the process! I'm really a beginner with AE, could you try to explain me how to do it?
I generally work with pre-set animations and include the logo I want in them, so as I don't make the entire composition I don't know how to handle them properly... anyway I believe a little ste-by-step would help!
thanks again

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hi
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ugisiger wrote:
> hi
> no any extras. simply 5 layers "distributed" on the
timeline.
> if i open a "animated" psd, so i get a file with the
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>
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>
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Jim Babbage - .:Community MX:. & .:Adobe Community
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Combining Canvas subclasses for Animation

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