Basic cellular automata algorithm

gistfile1.txt

1. Scatter wall blocks across the level at a 30-40% saturation level (I've found that 39% is ideal).

2. Iterate through all the tiles on the map four times:
    - For each tile in each iteration, set the tile to be floor.
    - Then, calculate the number of wall tiles within both one square of the original tile (these are neighbors) and two squares (these tiles are nearby). Store these numbers.
    - If the number of neighbors for the tile is greater than or equal to 5, or there are less than two wall tiles nearby, set this tile to be a wall.
    - If it is not a wall already, leave this tile as a floor tile.

3. Iterate through all the tiles on the map three more times:
    - For each tile in each iteration, set the tile to be floor.
    - Calculate the number of wall tiles within both one square of the original tile.
    - If this tile has five or more neighboring walls, make it a wall. Otherwise, leave it as a floor tile.