A lot of CAD programs will give some kind of coordinate output directly proportional to mouse movement.
I'd have to try pushing an optical mouse using my cnc, to find out how repeatable it would be. I would find it surprising if the mouse would not "lose or stretch the distance" for a few pulses every once in a while, depending on the surface, which would be kind of irrelevant for normal mouse usage, but very relevant when using it as an encoder. It would be interesting to know.
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