private void createMazeWithDFSBacktracking()
{
_grid = new Grid(SizeX, SizeZ);
Random rand = new Random();
// Set up stack for DFS.
var cellStack = new Stack<CellWithPosition>();
// Need to track number of unvisited cells for DFS. Decrement each time we visit a new cell.
int numOfUnvisitedCells = SizeX * SizeZ;
// Pick a random initial cell as currentCell and mark as visited.
var randX = rand.Next(0, SizeX);
var randZ = rand.Next(0, SizeZ);
var currentCell = new CellWithPosition
{
Cell = Matrix[randX, randZ],
XPos = randX,
ZPos = randZ
};
currentCell.Cell.IsInMaze = true;
--numOfUnvisitedCells;
while (numOfUnvisitedCells != 0)
{
// Choose randomly one of the unvisited neighbours, or check for the absence of any.
var randomUnvisitedNeighborOfCurrent = chooseRandomUnvisitedNeighbor(currentCell.XPos, currentCell.ZPos);
// Check if the current cell has any neighbours which have not been visited.
if (randomUnvisitedNeighborOfCurrent.CellWithPosition.Cell != null)
{
// Push current cell on to the stack.
cellStack.Push(currentCell);
// Remove the wall between the current cell and the chosen cell.
_grid.BreakWall(currentCell.XPos, currentCell.ZPos, randomUnvisitedNeighborOfCurrent.RelativeLocation);
// Make the chosen cell the current cell and mark it as visited.
currentCell = randomUnvisitedNeighborOfCurrent.CellWithPosition;
currentCell.Cell.IsInMaze = true;
--numOfUnvisitedCells;
}
else if (cellStack.Count != 0)
{
// Pop a cell off stack and make it the current cell.
currentCell = cellStack.Pop();
}
}
}
public void BreakWalls_MatchPattern()
{
// Arrange
var knownGoodMatrix = new Cell[3, 3];
Cell SWCell = new Cell
{
HasNorthWall = false,
HasSouthWall = true,
HasEastWall = false,
HasWestWall = true
};
Cell SCell = new Cell
{
HasNorthWall = false,
HasSouthWall = true,
HasEastWall = false,
HasWestWall = false
};
Cell SECell = new Cell
{
HasNorthWall = false,
HasSouthWall = true,
HasEastWall = true,
HasWestWall = false
};
Cell WCell = new Cell
{
HasNorthWall = false,
HasSouthWall = false,
HasEastWall = false,
HasWestWall = true
};
Cell CenterCell = new Cell
{
HasNorthWall = false,
HasSouthWall = false,
HasEastWall = false,
HasWestWall = false
};
Cell ECell = new Cell
{
HasNorthWall = false,
HasSouthWall = false,
HasEastWall = true,
HasWestWall = false
};
Cell NWCell = new Cell
{
HasNorthWall = true,
HasSouthWall = false,
HasEastWall = false,
HasWestWall = true
};
Cell NCell = new Cell
{
HasNorthWall = true,
HasSouthWall = false,
HasEastWall = false,
HasWestWall = false
};
Cell NECell = new Cell
{
HasNorthWall = true,
HasSouthWall = false,
HasEastWall = true,
HasWestWall = false
};
knownGoodMatrix[0, 0] = SWCell;
knownGoodMatrix[1, 0] = SCell;
knownGoodMatrix[2, 0] = SECell;
knownGoodMatrix[0, 1] = WCell;
knownGoodMatrix[1, 1] = CenterCell;
knownGoodMatrix[2, 1] = ECell;
knownGoodMatrix[0, 2] = NWCell;
knownGoodMatrix[1, 2] = NCell;
knownGoodMatrix[2, 2] = NECell;
var target = new Grid(3, 3);
// Act
target.BreakWall(0,0,GridDirection.East);
target.BreakWall(0, 0, GridDirection.North);
target.BreakWall(0, 1, GridDirection.East);
target.BreakWall(0, 1, GridDirection.North);
target.BreakWall(0, 2, GridDirection.East);
target.BreakWall(2,0, GridDirection.West);
target.BreakWall(2, 0, GridDirection.North);
target.BreakWall(2, 1, GridDirection.West);
target.BreakWall(2, 1, GridDirection.North);
target.BreakWall(2, 2, GridDirection.West);
target.BreakWall(1, 2, GridDirection.South);
target.BreakWall(1, 0, GridDirection.North);
// Assert
for (int i = 0; i < 3; ++i)
{
for (int j = 0; j < 3; ++j)
{
Assert.AreEqual(knownGoodMatrix[i, j], target.Matrix[i, j], $"Cell at [{i},{j}] doesn't match.");
}
}
}
