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)));
}
public ISigmaMap <MazeCell> Construct(MapSize size)
{
return(ArraySigmaMap
.From(FixConnectivity(SymmetricallyComplete(InitAboveDiagonal(size)))));
}