automatically add edges

[unknowndevice]

Hi! I'm just wondering if I could feature request automatically adding edges. I think it's something a lot of people would use. You can see an example of it here in RPG Marker.
https://www.youtube.com/watch?v=IR9y6vco-VQ&t=2m14s

Thanks!

[awesomez]

This is called "autotile" and is actually what I came here to request.

It would be nice to be able to pick a "main" tile, an "edge" tile, an "inside corner/diagonal" tile and an "outside corner/diagonal" tile that automatically generated when painting for things like layers of grass/etc.

This could be done as a proxy area that we could later press a button to "fill" the area with the proper tiles after painting and clicking the "update" button.

OR

An alternative way to go about this is to give the ability to select 3 additional tile selections at once. Hold SHIFT or CTRL or ALT to use each of the tiles to draw at any moment (with each "extra" tile selection being tied to the respective key and only active while painting with the current modifier key held down).