How to merge many images in ImageMagick with a given step (negative)?

Question

ImageMagick

Hello.
There is a need to glue the map from the screenshots. Screenshots were made with an overlay. So? each next fragment should be offset by -200px relative to the right border of the previous one, and 100px down from the top (because we have a diamond-shaped map). Those. it turns out such a diagonal row from left to right / down. There are 301 images in a row. There are 101 such rows. A total of 30401 images. Each next row starts over the previous one. File numbering starts from the left corner of this diamond.
I implemented such an overlay in JavaScript and am still tinkering with code optimization. Because it is problematic to load such a volume with a browser, just as it is problematic to process such a script. As a result, I thought about all sorts of map APIs, but they all require one large glued image.
None of the programs for gluing panoramas helped me. I need a gluing with a given offset. One hope for ImageMagick, because it seems to me that it’s really possible to somehow repeat the script that I wrote in JS. But I learned about this program just yesterday and I have no idea how to implement what I need. So far, I've managed to just glue a few pictures in a row, but that's not it.
How it should look like in the end, you can see here - lss.format23.ru
I would be very grateful if you could tell me how to write such a command for ImageMagick.

Answer 1

The task is rather complicated by the fact that your screenshot scheme does not have a rectangular, but an inclined grid. But judging by what I see in your example, the vertical rows are straight, that is, the vertical offset between two adjacent tiles is only vertical.
I would go the following way:
- I would crop the images until the overlap is eliminated (shave, gravity www.imagemagick.org/Usage/crop )
- I would glue the resulting tiles (montage) into vertical stripes
- I would sequentially merge the vertical stripes horizontally, adding each time one vertical strip on the right, so as not to fool around with the offset.