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A few years ago, I ran into a program called Dynadraw by Paul Haeberli. I was immediately intrigued. That was the first time I encountered an interactive graphical C program that was fun and relatively simple. Thinking it would be nice to get into using C for interactive work, I sat down with the red book and the GLUT spec one day and cranked out a few fun drawing programs. The programs are set up a bit like Macromedia Flash and Director. The coordinate space has been set up so that the origin is in the upper left with the positive y axis pointing downward. Pixel offsets are used for positioning. The screen is updated on a regular interval. These programs serve as a nice stepping stone for Flash and Director programmers to get into OpenGL and GLUT. This same framework was used to port dynadraw from original GL to OpenGL/GLUT.
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Usage Instructions
The C source code files for the aforementioned drawing programs are provided below. The comments at the top of each file includes Mac OS X build instructions, but these sources should be ridiculously easy to compile on any recent operating system. Please note that gnu gcc is required in order to compile these sources into binary executables. If installing and configuring gcc proves to be more annoying than it's worth, a tarball containing the sources and compiled Mac OS X binaries of the programs is also available.
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