private ImmutableSigmaMap <MazeCell> FixConnectivity(ImmutableSigmaMap <MazeCell> maze)
{
return(IsConnected(maze) ? maze : maze
.Insert(new SigmaIndex(0, maze.Size.X), MazeCell.Empty)
.Insert(new SigmaIndex(maze.Size.Y, 0), MazeCell.Empty)
.Insert(new SigmaIndex(1, maze.Size.X), MazeCell.Empty)
.Insert(new SigmaIndex(maze.Size.Y, 1), MazeCell.Empty)
.Insert(new SigmaIndex(0, maze.Size.X - 1), MazeCell.Empty)
.Insert(new SigmaIndex(maze.Size.Y - 1, 0), MazeCell.Empty));
}
private ImmutableSigmaMap <MazeCell> InitAboveDiagonal(MapSize size)
{
// need a local variable here to put it into a closure
ImmutableSigmaMap <MazeCell> maze = ArraySigmaMap.From(size, _ => MazeCell.Wall);
return(Graph.DepthFirstTraverse(new SigmaIndex(0, 0),
s => s.Neighborhood
.Clamp(size)
.OrderBy(_ => random.Next()),
s => s.Neighborhood
.Clamp(size)
.Where(x => maze[x] == MazeCell.Empty)
.Count() > emptyNeighborhood
).Aggregate(maze, (m, r) => maze = m.Insert(r.Node, MazeCell.Empty)));
}
private ImmutableSigmaMap <MazeCell> SymmetricallyComplete(ImmutableSigmaMap <MazeCell> maze)
{
return(maze.Where(s => maze[s] == MazeCell.Empty)
.Aggregate(maze, (m, s) => m.Insert(s.DiagonalMirror(m.Size), MazeCell.Empty)));
}
