I’m at a bit of a coders block, and I’m sure it’s quite simple. 
I tried using the following:
((angle-180)%360) + 180
But for angles < 180 degrees, it works just fine, but after that it get’s a little funny. I know why it’s doing that, I’m just looking for a way to fix it.
Is there any way to do it quickly without 6 lines of codes containing if statements? The code should be as efficient as possible.