public AbstractMaze(int rows, int columns)
{
Rows = rows;
Columns = columns;
m_Maze = new AbstractMazeCell <T> [Rows, Columns];
BuildStack = new Stack <AbstractMazeCell <T> >();
Random = new Random();
}
public AbstractMazeCell <T> GetExitFromOriginAndDepth(AbstractMazeCell <T> origin, int moves)
{
var solutionPath = GetPathFromOriginToExit(origin, null, moves);
if (solutionPath != null)
{
return(solutionPath[solutionPath.Count - 1]);
}
return(null);
}
public void ResetMaze()
{
BuildOrigin = null;
for (int rowIndex = 0; rowIndex < Rows; rowIndex++)
{
for (int columnIndex = 0; columnIndex < Columns; columnIndex++)
{
m_Maze[rowIndex, columnIndex] = new AbstractMazeCell <T>(rowIndex, columnIndex);
}
}
}
public List <AbstractMazeCell <T> > GetPathFromOriginToExit(AbstractMazeCell <T> origin, AbstractMazeCell <T> exit, int killDepth)
{
var solutionPath = new List <AbstractMazeCell <T> >();
var ProcessedCellsList = new List <AbstractMazeCell <T> >();
var ProcessedCellsOriginsList = new List <AbstractMazeCell <T> >();
var CellQueue = new Queue <AbstractMazeCell <T> >();
// breadth-frist algorithm
var currentCell = origin;
ProcessedCellsOriginsList.Add(currentCell);
while (currentCell != null)
{
solutionPath.Clear();
currentCell.Status = AbstractMazeCellStatuses.Processed;
if (currentCell.North_Neighbor != null && currentCell.North_Neighbor.Status.Equals(AbstractMazeCellStatuses.Ready))
{
CellQueue.Enqueue(currentCell.North_Neighbor);
ProcessedCellsOriginsList.Add(currentCell);
currentCell.North_Neighbor.Status = AbstractMazeCellStatuses.Queued;
}
if (currentCell.West_Neighbor != null && currentCell.West_Neighbor.Status.Equals(AbstractMazeCellStatuses.Ready))
{
CellQueue.Enqueue(currentCell.West_Neighbor);
ProcessedCellsOriginsList.Add(currentCell);
currentCell.West_Neighbor.Status = AbstractMazeCellStatuses.Queued;
}
if (currentCell.East_Neighbor != null && currentCell.East_Neighbor.Status.Equals(AbstractMazeCellStatuses.Ready))
{
CellQueue.Enqueue(currentCell.East_Neighbor);
ProcessedCellsOriginsList.Add(currentCell);
currentCell.East_Neighbor.Status = AbstractMazeCellStatuses.Queued;
}
if (currentCell.South_Neighbor != null && currentCell.South_Neighbor.Status.Equals(AbstractMazeCellStatuses.Ready))
{
CellQueue.Enqueue(currentCell.South_Neighbor);
ProcessedCellsOriginsList.Add(currentCell);
currentCell.South_Neighbor.Status = AbstractMazeCellStatuses.Queued;
}
ProcessedCellsList.Add(currentCell);
// if the solution is found, force finish
if (exit != null && currentCell.Equals(exit))
{
CellQueue.Clear();
}
// process the solution, check its length for kill depth
var parentCell = currentCell;
int parentCellIndex = -1;
while (!parentCell.Equals(origin))
{
solutionPath.Insert(0, parentCell);
parentCellIndex = ProcessedCellsList.IndexOf(parentCell);
parentCell = ProcessedCellsOriginsList[parentCellIndex];
}
// check for kill depth, force finish if reached
if (solutionPath.Count == killDepth)
{
CellQueue.Clear();
}
// add the origin to the beginning
solutionPath.Insert(0, origin);
// finally, if there is another cell to process from the queue, do so
if (CellQueue.Count > 0)
{
currentCell = CellQueue.Dequeue();
}
else
{
currentCell = null;
}
}
// reset maze for next solution
UnprocessCells();
return(solutionPath);
}
// Currently only uses the recursive backtracking algorithm
public void BuildFromOrigin(int rowOrigin, int columnOrigin)
{
ResetMaze();
BuildOrigin = m_Maze[rowOrigin, columnOrigin];
// recursive backtracking
var currentCell = BuildOrigin;
currentCell.Status = AbstractMazeCellStatuses.Ready;
while (currentCell != null)
{
// neighbor options
var neighborOptions = new List <AbstractMazeCell <T> >();
// push north neighbor
if (currentCell.Row - 1 > -1)
{
if (!m_Maze[currentCell.Row - 1, currentCell.Column].Status.Equals(AbstractMazeCellStatuses.Ready))
{
neighborOptions.Add(m_Maze[currentCell.Row - 1, currentCell.Column]);
}
}
// push west neighbor
if (currentCell.Column - 1 > -1)
{
if (!m_Maze[currentCell.Row, currentCell.Column - 1].Status.Equals(AbstractMazeCellStatuses.Ready))
{
neighborOptions.Add(m_Maze[currentCell.Row, currentCell.Column - 1]);
}
}
// push east neighbor
if (currentCell.Column + 1 < Columns)
{
if (!m_Maze[currentCell.Row, currentCell.Column + 1].Status.Equals(AbstractMazeCellStatuses.Ready))
{
neighborOptions.Add(m_Maze[currentCell.Row, currentCell.Column + 1]);
}
}
// push south neighbor
if (currentCell.Row + 1 < Rows)
{
if (!m_Maze[currentCell.Row + 1, currentCell.Column].Status.Equals(AbstractMazeCellStatuses.Ready))
{
neighborOptions.Add(m_Maze[currentCell.Row + 1, currentCell.Column]);
}
}
// if there are options, choose one and push currentCell to stack
if (neighborOptions.Count > 0)
{
DeadEnd = false;
// choose a neighbor at random
var index = Random.Next(0, neighborOptions.Count);
var chosenCell = neighborOptions[index];
// push currentCell onto stack
BuildStack.Push(currentCell);
// whichever neighbor was chosen needs to have a path declared to and from currentCell
if (chosenCell.Row == currentCell.Row)
{
if (chosenCell.Column == currentCell.Column - 1) // west neighbor
{
currentCell.West_Neighbor = chosenCell;
chosenCell.East_Neighbor = currentCell;
}
else // east neighbor => chosenCell.Column == currentCell.Column + 1
{
currentCell.East_Neighbor = chosenCell;
chosenCell.West_Neighbor = currentCell;
}
}
else
{
if (chosenCell.Row == currentCell.Row - 1) // north neighbor
{
currentCell.North_Neighbor = chosenCell;
chosenCell.South_Neighbor = currentCell;
}
else // south neighbor => chosenCell.Row == currentCell.Row + 1
{
currentCell.South_Neighbor = chosenCell;
chosenCell.North_Neighbor = currentCell;
}
}
// make chosen into current after processing
chosenCell.Status = AbstractMazeCellStatuses.Ready;
currentCell = chosenCell;
}
// there are no neighbor options, pop a cell off the stack and make it current
else
{
OnFinalProcessingCell?.Invoke(currentCell);
if (!DeadEnd)
{
DeadEnd = true;
OnDeadEndCreation?.Invoke(currentCell);
}
if (BuildStack.Count > 0)
{
currentCell = BuildStack.Pop();
}
else
{
currentCell = null;
}
}
}
// the origin is always a dead end, too
OnDeadEndCreation?.Invoke(BuildOrigin);
// the maze is generated
OnMazeGenerated?.Invoke(m_Maze);
}
public static MazeWallConfigCodes GetWallConfig(AbstractMazeCell <T> cell)
{
if (cell.North_Neighbor != null)
{
if (cell.West_Neighbor != null)
{
if (cell.East_Neighbor != null)
{
if (cell.South_Neighbor != null)
{
return(MazeWallConfigCodes.None);
}
else // south is null
{
return(MazeWallConfigCodes.South_Only);
}
}
else // east is null
{
if (cell.South_Neighbor != null)
{
return(MazeWallConfigCodes.East_Only);
}
else // south is null
{
return(MazeWallConfigCodes.East_South);
}
}
}
else // west is null
{
if (cell.East_Neighbor != null)
{
if (cell.South_Neighbor != null)
{
return(MazeWallConfigCodes.West_Only);
}
else // south is null
{
return(MazeWallConfigCodes.West_South);
}
}
else // east is null
{
if (cell.South_Neighbor != null)
{
return(MazeWallConfigCodes.West_East);
}
else // south is null
{
return(MazeWallConfigCodes.West_East_South);
}
}
}
}
else // north is null
{
if (cell.West_Neighbor != null)
{
if (cell.East_Neighbor != null)
{
if (cell.South_Neighbor != null)
{
return(MazeWallConfigCodes.North_Only);
}
else // south is null
{
return(MazeWallConfigCodes.North_South);
}
}
else // east is null
{
if (cell.South_Neighbor != null)
{
return(MazeWallConfigCodes.North_East);
}
else // south is null
{
return(MazeWallConfigCodes.North_East_South);
}
}
}
else // west is null
{
if (cell.East_Neighbor != null)
{
if (cell.South_Neighbor != null)
{
return(MazeWallConfigCodes.North_West);
}
else // south is null
{
return(MazeWallConfigCodes.North_West_South);
}
}
else // east is null
{
if (cell.South_Neighbor != null)
{
return(MazeWallConfigCodes.North_West_East);
}
else // not possible without adding different maze genrating algorithms to AbstractMazeGenerator.cs
{
return(MazeWallConfigCodes.All);
}
}
}
}
}