Composition tools?

After hand-animating my first GameFrame piece, I decided I needed to start writing some code to do it for me. I’ve begun a simple Java library which I’ll put on github soon, but I was just wondering if others have done anything similar.

So far I’ve just created a few simple tools like an object wrapper for a single frame, keyframing, fades, and a very simple sprite-like thing.

Here’s one example, a simple random-pixel animation, but using fades to have each pixel stick around for a little while: http://instagram.com/p/sY0VbFI3fV/

Here’s another. Each falling line is handled by an object that knows how to advance itself to the next frame. The fadeout is taken care of by copying each frame, fading it, then drawing the next frame on top of it. http://instagram.com/p/sZL_F3I3av/