public static Level TrimWalls(Level level)
{
// First make a copy.
Level newLevel = new Level(level);
// Delete walls that don't contact the interior.
foreach (Coordinate2D coord in newLevel.Coordinates)
{
if (!level.IsWall(coord))
{
continue;
}
bool foundInterior = false;
foreach (Coordinate2D neighbor in coord.EightNeighbors)
{
if (level.IsInside(neighbor))
{
foundInterior = true;
break;
}
}
if (!foundInterior)
{
newLevel[coord] = Cell.Empty;
}
}
return newLevel;
}