Add customisable guides to 2D view

[JohnGabrielUK]

Describe the project you are working on

A 2D Metroidvania with a fixed camera that snaps between screen-sized rooms.

Describe the problem or limitation you are having in your project

When creating the game world as a TileMap, there isn't an easy way to see the boundaries between one screen and the next.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

When working on a 2D scene, there would be the option to show guide lines repeating at a given X and Y offset. So, if my rooms are 480x224, I should be able to set the offset as that, and easily see where the boundaries are.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

When in the 2D view, I click "View". A new option called "Configure Guides..." is available. I click on it, and enter my desired width/height. When I click okay, the configured lines are visible in the 2D view.

If this enhancement will not be used often, can it be worked around with a few lines of script?

Not really. You can make your own references by placing dummy textures or such, but it's an inelegant solution.

Is there a reason why this should be core and not an add-on in the asset library?

Personally, I believe the ratio of code size versus usefulness to a wide range of users warrants this feature being in the core program.

[KoBeWi]

This can be easily achieved by placing a @tool script in the root node that draws the lines. Sure, you need to add it in every scene, but I think it's pretty normal to have some sort of Map script; I have one in every of my projects.

[aalcutt]

This is a feature of the editor I have always wanted as well. In the past I have resorted to using the grid rulers and dragging them across the map as needed. The @tool idea is a nice suggestion as well and I never thought of that and will likely use that as a work around for the time being. I still think this would be a nice built in enhancement to the 2D view though.

[Calinou]

You could also set the grid size to 480×224, but this will make snapping work according to those coordinates.

[JohnGabrielUK]

As seen above, duncathan has a similar proposal (#7588), which I believe is a better way of solving the same problem.