Switch default scroll wheel action when hovering, add keybindings.

[GrimPixel]

When I play the chess, I have to click the left mouse button, press the Ctrl key, then scroll the mouse wheel. This is the biggest inconsideration by far. I think I could simply press Ctrl or Shift to lift and drop pieces. Many other operations also require two keys pressed together.

[elmodor]

I would be able implement keybindings to raise/lower pieces if that's okay with @drwhut .

Which keys should be used to raise/lower the pieces? This is a keybinding that should only work when hovering a piece. Since Ctrl and Shift are already bound to other actions we would 2 other keys for this.

[GrimPixel]

I see. Q, E, Z, X, C are unassigned (on QWERTY layout).

[drwhut]

I had an idea after #140 was implemented - with your specific example, what if the current Ctrl+Scroll Wheel functionality was the default (as in, just Scroll Wheel would lift the piece perpendicular to the table, rather than towards/away from the camera)? Since pieces no longer change horizontal position when they are initially hovered, maybe this change could be made consistent to how one lifts a piece?

[elmodor]

Actually I had the same idea. So we swap the ctrl+scrollwheel and scrollwheel functionality for hovered pieces? Do we still want to add keybindings to raise the piece? Maybe it's more convenient to press some keys instead to use the scrollwheel?

[drwhut]

That would make sense - this is somewhat subjective though, so I'll ask some of the alpha testers what they think. Feel free to comment (anyone!) as well what you think would be the most intuitive way of going about this.

[GrimPixel]

An object in 3D space has 6 degrees of freedom. The mouse movements control x and y, the mouse wheel controls the z.

[drwhut]

For the next beta test, I'm going to try switching the default scroll wheel action to lifting pieces (perpendicular to the table), and having Ctrl+Scroll Wheel be zooming the piece in and out of the camera. I'll also think about key bindings to do this, as well.

[elmodor]

Sounds good! Would be cool if the scrollwheel would be a changeable keybind - if that is possible in godot.

[drwhut]

AFAIK the only way to get scroll wheel input is via _input() or _unprocessed_input() - but I'll have another look at the docs to see if there is a way, since that would simplify things.