I'm feeling proper knackered this evening, even after a couple of hours sleep. Did a bunch of thinking today (work and paint), and the diet is starting to kick in.

So yes, lox was/is massive overkill for the paint language. Current design is command per line, with a command word followed by space seperated options. E.g:

draw rectangle 1 10 30 20 40

Currently it knows draw rectangle, draw circle, and erase last (where the erase command is to undo one of the other two). I'm going to need to add at least move, resize, rotate, maybe skew, and set style.

Commands generally take a shape id as a parameter.

We'll need to add more shapes.