Thank you - it worked, except for the vec.vang function, where I had to change "a = -a" to "a = 2*math.pi-a"

Other than that, beautiful.

Whoa, I'm impressed. I'll check this out when I get to work on Monday. Thanks.

I'm creating a simple clock program and trying to make it so that the user can highlight an arc of time to give a visual reference for how much time is remaining until some certain future point. It works fairly well right now unless you swipe across the vertical axis. The angle changes from 4.7 to -...