[danudey]

The #1 issue I've had with online VTTs is getting the VTT's grid aligned with the map's grid. I tried this with your solution and the problem was the same; it creates a grid and assumes the grid starts at the very edge of the image and goes to the other edge, meaning that if I want those grids to actually line up then I have to crop the image carefully, which is a huge hassle.

Two things that would make this tool easier to use:

1. Let me manually tune the grid in the VTT to the size of the grid in the image, either by selecting one square and having the system adjust the size and position of the grid to that, or by selecting some number of squares and specifying how many squares I selected, which would give a more accurate measurement.

2. Let me draw rooms with a box tool as well as walls with the wall tool, and let those rooms (by default) snap to the grid. Extra points if I can create a box and then add new vertices to drag out a less boxy shape (i.e. to add alcoves, cutouts, etc).

I haven't yet seen a VTT that can handle grids and boxes and rooms automatically, but as soon as someone figures out how to do AI or machine learning-powered map analysis to turn an image of a map into a (mostly? partly?) usable setup (with tweaks to be done afterwards) is going to get a lot of attention.