Python graphic module: observations, assumptions, suggestions

[parisse]

Then both draw_arc and draw_filled_arc are wrong, cf. the Xcas session (or test the same code on the Nspire CX/CX2 and Numworks). Angles should be mesured in degrees counterclockwise (and 0 degree is oriented to the right). Moreover only the arc should be drawn.
There is something wrong in the C code that calls the Prime corresponding commands from the graphic MicroPython module : I guess Cyrille did call his own functions, unlike on Xcas/Nspire/Numworks where I call CAS graphic functions.