The drawing above is by Ben Young. I love it.
Released new code bundle. Only code change is that I’ve mended this line about how the crc_check pre-computed value table is defined in polargraph_server_polarshield.ino. The only purpose for this is to allow it to compile in the newest versions of the Arduino IDE (1.6x). If you aren’t using that version, you don’t need to update anything.
Also updated the UTFT library to v2.81, for the same reason (Arduino IDE 1.6 compatibility).