Feature Request: Make grid density threshold configurable

[JarmoHu]

Current Behavior:
When zooming in, the displayed major grid spacing is dynamically adjusted based on the grid's pixel size (dgrid) relative to the fixed font width (fwr). According to the code in layGridNet.cpp (render_bg function), the threshold for using a coarser grid (and potentially switching to style2) seems to be hardcoded around dgrid < fwr * 4. This means the grid becomes relatively sparse even when there might be sufficient screen space to display a denser grid.

Desired Behavior:
I would like the multiplier used in this threshold (currently 4) to be configurable by the user. This would allow users to choose a smaller threshold (e.g., 1, 2) if they prefer to see a denser grid at higher zoom levels.

Why this feature is needed:
For tasks involving very fine layout details or on high-resolution displays, the current hardcoded threshold can limit the usefulness of the grid as a visual reference at high magnification. Being able to adjust this threshold would provide more flexibility to match user preferences and specific workflow needs. For example, I often find the grid disappears or becomes too coarse earlier than I'd like when inspecting nanoscale features.

Context:

• KLayout Version: 0.30.0
• Operating System: win10 20h2

Suggested Solution:
Add a configuration option, possibly in the "Setup -> Display -> Background" settings page, allowing users to set the "Grid density font width multiplier" (or a similar name), with a default value of 4.

Thank you for considering this enhancement request!

[klayoutmatthias]

Hi @JarmoHu,

thanks for this suggestion.

In my case, the 4x factor already creates pretty dense grids. This is how dense the grid becomes and how that relates to the font size:

Maybe you can share a screenshot how it looks in your case?

Matthias

[klayoutmatthias]

That's how it looks now

[JarmoHu]

Hello, please allow me to explain my requirements. For me, the grid isn't just for estimating pattern size; I need it for much more precise pattern movement (using both the mouse and keyboard). For example, my manufacturing precision is 1nm, which means I have to zoom in significantly just to see a 1nm grid. Therefore, I need the grid to function effectively at this level to assist with precise pattern placement, even if it results in a grid that looks aesthetically too dense.

[JarmoHu]

That's how it looks now

Thanks very much.