Colorful wave solver. I commented and organized the source as best as I can. Feedback appreciated.
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That's one of my main reasons of using Processing (Java) instead of a lower-level language like C++. I seriously doubt anyone would be interested in downloading an exe to try out any of the 10 second demos I make.
Also you can create applets in Processing reasonably quickly. There's a lot less hassle with language-specific and library stuff.