Re: animation with static background image`

You usually a completely opaque background, so that the previous frame
has no effect on the appearance of the next frame. Draw the background,
which effectively wipes out all trace of the previous frame, and then draw
your red circle. Drawing from back-to-front like this is known as "Painters
Algorithm".

please give me an example or some links...
My problemm is like this: using threads simulate the rotation of
planets arround Sun. All animation is done over some background image
that the user can change... Animation should have play/pause option.
Can you give me some ideas?

.

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