2017-01-22 Gridmapper Arcs and Diagonals

I’ve spent some time fiddling with Gridmapper. The new version is incompatible with the old version if you used the larger arcs. If you need to load map you saved using the old version, you can use this link:

You’ll note that it uses n to create arcs.

Let’s assume you used those arcs in a map of yours:

Here’s what you’ll get when you switch to the new version: the arcs turned into diagonals with walls.

That’s because the new version supports more variants regarding diagonals and it treats arcs differently.

Just to make sure you can always find the link to an old version of Gridmapper if you need it, I’ve made sure the individual maps currently saved on the wiki all link to Gridmapper 1.1. Just in case. :)

You can always save that and continue working offline – or change the those diagonals to arcs. You can do a text export and replace as follows:

nvvv → avv
nvv  → av
nv   → a

Features of the new Gridmapper

The latest Gridmapper version moves arcs to a separate layer. They’re now “below” the floor, so that you can place stuff on top of the round parts without strange overlaps. That means you can create maps like the following without any hassles:

This solves one of the issues on my list.

It uses a to create arcs.

Diaonals have also been improved. We now have three variants:

  1. the ordinary diagonal tile without any black background
  2. a diagonal tile with a diagonal wall
  3. a square tile with a diagonal wall

You cannot use w to create diagonal walls, unfortunately. You also cannot use wall mode to place walls or doors in the diagonals. Maybe some day. Leave a comment if you need this.


  1. Do you use Gridmapper? Please consider sharing your maps by leaving a link. Or upload a map to social media or imgur.
  2. Do you ever host maps for others to follow along as you map in an online game?



Alex, as far as I’m concerned Gridmapper is the single most useful resource on the internet for dungeon creation. I have absolutely no artistic ability, but Gridmapper has enabled me to create fantastic maps that only require slight image processing. Keep up the great work and I’ll stay tuned for further updates. Thanks so much for creating this (also, the diagonal wall is a godsend. Great update).

Noah Leben 2017-02-03 21:16 UTC

Below is a map I created using the program and a simple image processing tool. I do have a couple of suggestions that could improve the program even further.

  1. More wall types would be great. Dotted line, two thin lines (for raised platforms), a curved line tile (similar to the diagonal line tile). I also saw at one point you had an “opening” for an archway option. I’d like to see that come back.
  2. More door types, such as a double door that fits into one square. Diagonal doors would be great as well.
  3. Being able to place pillars and doors on vertices would be great but I realize that’s likely beyond the scope of this program.
  4. You should be able to rotate the “c” assets in my opinion.
  5. A bridge icon.

Gridmapper is fantastic but this additional functionality would really make it superb. Thanks again for the great tool.


Noah Leben 2017-02-03 21:44 UTC

WHOA!! This map is super awesome! Thank you for sharing!

– Alex Schroeder 2017-02-04 08:49 UTC

As for the comments:

The problem with raised platforms are the corners. If you don’t use corners, it will be easy to do. I’ll have to think about something.

easy  hard
 ═    ╔═
║     ║

The archway still exists but it’s a door variant. I don’t think I ever had any other?

As for pillars on vertices I guess I could treat them like doors? Maybe something worth investigating. Also doors shifted by half a tile might work because the double doors already work like that.

Rotating chests, beds and tables … I think this can be done.

What would a bridge icon look like? Do you have an example somewhere?

– Alex Schroeder 2017-02-04 09:14 UTC

I added all the items to the issue tracker.

– Alex Schroeder 2017-02-04 20:43 UTC

Rotating chests, beds and tables has been implemented. :)

– Alex Schroeder 2017-02-04 21:10 UTC

You know, I’m not sure what to do for a bridge icon that would fit the parameters of this program. However, while contemplating that I came up with another stair icon that would be useful: a 1-tile stair icon where the lines went all the way across the icon instead of gradually getting smaller. Jennell Jaquays drew stairs like this in Caverns of Thracia. Seems like this tile would allow users to create stairs of any desired length.


– Anonymous 2017-02-04 23:50 UTC

Yeah, but what about the arrow required? Where to place it, how long to draw it, or allow manual placement?

– AlexSchroeder 2017-02-05 07:34 UTC

I guess room 45 shows how to combine it with a tapering off without arrow...

– AlexSchroeder 2017-02-05 07:35 UTC

Personally, I don’t think the arrow is absolutely required, as the direction of the stairs could be handled in the map’s key. But having an arrow wouldn’t necessarily be a bad idea! Also, I saw your post on r/osr! Small world. I’m really excited that some of these updates are going to be implemented.

– Noah Leben 2017-02-05 16:12 UTC

I’ve tried using windows to indicate bridges and it looks pretty OK to me, what do you think?



– Alex Schroeder 2017-02-08 18:02 UTC

That’s not a bad technique! I like the creative re-use of an asset. Very innovative. I tested it just now and it should certainly work for my purposes.

I did think of another potential tile: a circular equivalent to the new “n” tiles. That is, a tile with a curved line bisecting it (you could do one half gray and one full whitejust like the “n” tiles). Not sure if there are any issues in implementing this or not. It would be great to be able to create a circular room within a room.

Noah Leben 2017-02-08 23:04 UTC

Hm. Yes, maybe the three arcs need to exist in a walled variant, too.

Something else, though: Ever wished for color coding? See #11.

Something like this:

Wilderness Map of A Red and Pleasant Land
Picture by El Dado Inquieto

– Alex Schroeder 2017-02-09 08:53 UTC

Yes, the arcs. Would have been clearer had I just said that in the first place, I suppose. Haha.

Color coding would be great. I could see it having a wide variety of applications. In the past I’ve mostly mapped in black and white, but I use color occasionally when necessary (color is easy enough for me to do after the fact with an image processing program, but having it native to the app is always preferable). Love the Red & Pleasant Land map.

Noah Leben 2017-02-09 20:15 UTC

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