#1502 Add snap to grid to sketch mode

[andrewvarga]

I'm thinking we could have a dropdown of 3 options for snapping, instead of just an on/off boolean:

• snapping off
• snap to default units
• snap to grid

That said, I have trouble imagining "snap to grid" being very useful with the current grid. On my screen these are the 2 extremes I have for the grid size:

• Largest: only a few grids fit on the screen, snapping to the grid intersections would be pretty large jumps, doesn't feel like it would be useful. It's a similar to using default units and zooming in too much as you mentioned.

• Smallest possible grids: still only 10 grids fit my screen per row, so still a bit too big jumps. This could be improved by:
  • Changing the grid zoom steps to allow grids to be smaller
  • Make the grid infinite to cover the screen, then 2x more grids would be visible per row

With those changes it could be useful to have the "snap to grid" option too, but I should change those things first then (?).

Related: am I correct that the "Fixed Size Grid" setting only applies to outside of sketch mode, not within sketch mode where it seems to have no effect? I wonder if that is on purpose or it should be fixed first too.

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #7893 will not alter performance

_{Comparing andrewvarga/1502/add-snap-to-grid-to-sketch-mode (a39bad1) with main (7235ab4)}

Summary

✅ 89 untouched benchmarks

[andrewvarga]

Update from sync today:

• Let the user set the grid size explicitly (eg. feet, 5 inches, 10mm), the grid being an infinite grid (current grid leaves empty space on the edge of the screen). The grid size is not dependant on current zoom level in the first pass of the implementation.
• The user can snap to the grid, this grid snapping is lower priority than other snappings: tangent to line, tangent to start profile, main axes.
• We can have a second, grayed out lower level grid which is dependend on the zoom level.