Hi,
codeswarm.rb is a rewrite of Michael Ogawa's code_swarm in ruby using cairo.
For an example see:
For the original code:
http://code.google.com/p/codeswarm
The format of the events xml file is compatible with code_swarm's one,
and the physics engine is basically the same.
The code is less than 500 lines of code, so it should be fairly hackable.
http://github.com/felipec/codeswarm.rb
Enjoy
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Felipe Contreras