Fix/angle snapping fix

[andybak]

A nicer implementation of angle snapping

[mikeskydev]

I'm getting what I can only describe as 'gimbal lock' at the north and south poles when attempting to rotate the selected item. It's not as intuitive as the previous implementation.

2022-07-04.15-49-24.webm

[andybak]

I think it's just "different bad" - if you'd tried to use the previous implementation in any depth you would have found other serious problems. I hadn't tried rotating at the poles however. I'll take a look.

[andybak]

I think it's just "different bad" - if you'd tried to use the previous implementation in any depth you would have found other serious problems. I hadn't tried rotating at the poles however. I'll take a look.

Actually - now I've tried it, I can confirm there's something weird going on aside from behaviour at the poles.

Investigating.

[andybak]

Sigh. I have no idea how to resolve this. I do know the current bahaviour is bad. Try creating multiple copies of a brush stroke arrayed around a center point with an angle snap of 45 degrees.

This commit kinda fixes that but with some fairly unintuitive side-effects. The cure is worse than the disease in this case but the underlying problem still remains.

I hate rotation.

[andybak]

@moatdd - any thoughts?