private bool CanCreateStairs(
MazeCell cell,
MazeCell otherCell,
MazeDirection direction)
{ // To create stairs, the strairs must have a altitude 0 low landing cell in the same
// room as the stairs, and there must not be an existing cell at the location of the
// future high landing cell.
bool result = false;
if (null != stairsPrefab && 0 == cell.altitude)
{
IntVector2 lowLandingCoordinates = cell.coordinates +
direction.GetOpposite().ToIntVector2();
IntVector2 highLandingCoordinates = otherCell.coordinates +
direction.ToIntVector2();
if (ContainsCoordinates(lowLandingCoordinates) &&
ContainsCoordinates(highLandingCoordinates))
{
MazeCell lowLandingCell = GetCell(lowLandingCoordinates);
if (null != lowLandingCell &&
cell.GetRoomNumber() == lowLandingCell.GetRoomNumber() &&
null == GetCell(highLandingCoordinates))
{
result = true;
}
}
}
return(result);
}
private void DoNextGenerationStep(
List <MazeCell> activeCells)
{
int currentIndex = activeCells.Count - 1;
Debug.Assert(currentIndex >= 0);
MazeCell currentCell = activeCells [currentIndex];
if (currentCell.IsFullyInitialized)
{
activeCells.RemoveAt(currentIndex);
return;
}
MazeDirection direction = currentCell.RandomUninitializedDirection;
IntVector2 coordinates = currentCell.coordinates + direction.ToIntVector2();
if (ContainsCoordinates(coordinates))
{
MazeCell neighbor = GetCell(coordinates);
if (neighbor == null)
{
if (null != cellTreePrefab && 0 == Random.Range(0, 77))
{
neighbor = CreateCell(coordinates, 0, cellTreePrefab);
activeCells.Add(neighbor);
}
else
{
neighbor = CreateCell(coordinates, 0, cellPrefab);
activeCells.Add(neighbor);
CreatePassage(activeCells, currentCell, neighbor, direction);
}
}
else if (currentCell.GetRoomNumber() == neighbor.GetRoomNumber() &&
doorProbability > 0 &&
currentCell.altitude == neighbor.altitude)
{
CreatePassageInSameRoom(currentCell, neighbor, direction);
}
else
{
CreateWall(currentCell, neighbor, direction);
}
}
else
{
CreateWall(currentCell, null, direction);
}
}
private void CreatePassage(
List <MazeCell> activeCells,
MazeCell cell,
MazeCell otherCell,
MazeDirection direction)
{ // Create one of the possible passable edges from one a cell in one
// room to a cell in another.
MazePassage prefab = passagePrefab; // generic passage
if (cell.altitude == 0 &&
Random.value < doorProbability)
{
// Possibly make a door from one room to the next
prefab = doorPrefab;
if (Random.value < doorProbability &&
CanCreateStairs(cell, otherCell, direction))
{
// Instead of a door, let's try to make stairs. Stiars occupy
// both cell and other cell and enforce constraints on
// a low landing cell at the base of the stairs and a
// high landing cell at the top of the stairs.
prefab = passagePrefab; // Not a door after all!
cell.accessory = Instantiate(stairsPrefab) as MazeCellAccessory;
cell.accessory.cell = cell;
cell.accessory.transform.parent = cell.transform;
cell.accessory.transform.localPosition = Vector3.zero;
cell.accessory.transform.localRotation = direction.ToRotation();
otherCell.Initialize(cell.GetRoomNumber());
IntVector2 highLandingCoordinates = otherCell.coordinates +
direction.ToIntVector2();
MazeCell highLandingCell = CreateCell(
highLandingCoordinates, 1, cellPrefab);
activeCells.Add(highLandingCell);
highLandingCell.Initialize(otherCell.GetRoomNumber() + 1);
MazePassage landingPassage = Instantiate(prefab) as MazePassage;
landingPassage.Initialize(otherCell, highLandingCell, direction);
GameObject newColumn = Instantiate(columnPrefab) as GameObject;
newColumn.transform.parent = otherCell.transform;
newColumn.transform.localPosition = Vector3.zero;
newColumn.transform.localRotation = direction.ToRotation();
if (null != railingColumnPrefab)
{
GameObject newRailingColumn = Instantiate(railingColumnPrefab) as GameObject;
newRailingColumn.transform.parent = highLandingCell.transform;
newRailingColumn.transform.localPosition = Vector3.zero;
newRailingColumn.transform.localRotation = direction.ToRotation();
}
}
else
{
// Doors alsways change room numbers
otherCell.Initialize(cell.GetRoomNumber() + 1);
}
}
else
{
// This passage is neither door nor stair
otherCell.Initialize(cell.GetRoomNumber());
otherCell.altitude = cell.altitude;
otherCell.transform.localPosition = new Vector3(otherCell.transform.localPosition.x,
otherCell.transform.localPosition.y + otherCell.altitude * 1.078f,
otherCell.transform.localPosition.z);
}
MazePassage passage = Instantiate(prefab) as MazePassage;
passage.Initialize(cell, otherCell, direction);
}