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u can play tic tac toe against a pen plotter using a webcam and some elbow grease...
C++ Lua CMake
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README.md

Human vs. Plotter Tic-Tac-Toe

@johnvtan and I used a Playstation eye and 1980's HP pen-plotter to create a new kind of user interface:

We used the C++ binding for OpenCV for image-processing, and implemented our game-logic in Lua (using the minimax decision algorithm). The plotter interfaces with our program over a serial connection, and takes drawing instructions in an antiquated plotter language called HPGL.

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