feat(view): Add ability to rotate the camera in 45 degree increments using the numpad

[Stubbjax]

Merge after #1854

This change adds the ability to rotate the camera in 45 degree increments by holding the CTRL modifier key when rotating the camera via the NumPad4 and NumPad6 keys.

ROTATE.mp4

[Skyaero42]

Use case:

• I manually rotate the camera 20 degrees to the left
• I then rotate the camera to the left with the Alt key.

Current outcome:

• Camera rotated 20 + 45 = 65 degrees

(Possible) expected outcome:

• Camera rotates and snaps to 45 degrees.

To do exact 45 step rotations in this PR, the camera needs to be reset first (numkey 5)

How do others look at this? +-45 degree rotating or 45 degree snapping?

[Stubbjax]

@Skyaero42 I considered the same thing. But you've already pointed out the solution: In the (probably rare?) situation the user unintentionally rotates the camera e.g. 20 degrees while intending their camera to be in direct 45 degree angles, they can easily reset the orientation by using NumPad5.

I would estimate changing the behaviour from 45 degree increments to 45 degree snapping would add quite a bit of complexity in comparison to the relatively simple current approach. As a solution exists for the offset use case (and the feature is unlikely to see much use), I opted for simplicity.

[xezon]

I did not expect it to be implemented for numpad buttons, but mouse3 (middle mouse button). When holding that button and moving the mouse, the camera rotates.

[Stubbjax]

I did not expect it to be implemented for numpad buttons, but mouse3 (middle mouse button). When holding that button and moving the mouse, the camera rotates.

Is that a problem?

[xezon]

Is that a problem?

Not per se, but I would have expected implementation for that to be similar to the building placement and easier to do.

[Stubbjax]

Is that a problem?

Not per se, but I would have expected implementation for that to be similar to the building placement and easier to do.

I actually found this approach easier to do. I did attempt it with the mouse initially, but it felt very awkward and the solution of tracking the mouse delta as stateful data separately to the camera rotation did not feel as clean.

[Stubbjax]

Is that a problem?

Not per se, but I would have expected implementation for that to be similar to the building placement and easier to do.

I had another go and managed to get it working correctly. See #1848.