Proof of concept for Marching Squares autotiling in fusion. Unfinished in the sense that I haven't implemented array saving, but it goes through the process.
currently has three example brushes, the default marching squares tileset(right arrow), the terrain(down arrow) and a foliage sihouetteleft and up arrows.MarchingSquaresBrush.mfa
To use:
Run the file, use the left mouse to draw empty space and the right mouse to draw tiles. use the arrow keys to switch between tilesets.
press the 1 key for default blocky view. press the 2 key for marching squares view.
Enjoy, and let me know if I've missed anything.