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Manual Drawing Routines (and compass)

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A simulation, of sorts, of a 256x64 pixel OLED display which has 2 bits of color per pixel. I've written the circle, arc, and line-drawing functions myself, from scratch, and whipped up a compass sort of thing with fancy trig and all that good stuff. I did this instead of having to try to cram it all on a microcontroller (and debug it) from the get-go.
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