public static T CreateMaze <T> (T grid) where T : MazeGrid
{
MazeCell currentCell = grid.GetRandomCell();
while (currentCell != null)
{
// Random Walk
List <MazeCell> unvisitedNeighbours = currentCell.Neighbours.FindAll(c => c.Links().Count == 0); //Unvisited neighbours of current cell
if (unvisitedNeighbours.Count != 0) // if has unvisited - link to current cell and set neighbour as new current cell
{
MazeCell neighbour = unvisitedNeighbours[Random.Range(0, unvisitedNeighbours.Count)];
currentCell.Link(neighbour);
currentCell = neighbour;
}
else
{
currentCell = null;
foreach (MazeCell cell in grid.EachCell())
{
/*
* List<MazeCell> visitedNeighbours = cell.Neighbours.FindAll(delegate(MazeCell obj) {
* if (obj.Links().Count != 0)
* {
* return true;
* }
* else
* {
* false;
* }
* });
*/
List <MazeCell> visitedNeighbours = cell.Neighbours.FindAll(c => c.Links().Count != 0); //was already visited
if (cell.Links().Count == 0 && visitedNeighbours.Count != 0) //unvisited cell with one visited neighbour
{
currentCell = cell;
MazeCell neighbour = visitedNeighbours[Random.Range(0, visitedNeighbours.Count)];
currentCell.Link(neighbour); //connect unvisited cell to one of the availible visited neighbours
break;
}
}
}
}
return(grid);
}
// Recursive backtracker is a depth-first search. But only the difference is that neighbour chooses randomly.
public static T CreateMaze <T> (T grid, MazeCell startCell = null) where T : MazeGrid
{
Stack <MazeCell> stack = new Stack <MazeCell>();
if (startCell == null)
{
startCell = grid.GetRandomCell();
}
stack.Push(startCell); //first cell
while (stack.Count != 0) //while have unvisited cells
{
MazeCell currentCell = stack.Peek();
List <MazeCell> neighbours = currentCell.Neighbours.FindAll(c => c.Links().Count == 0); //check if current cell has unvisited neighbours
if (neighbours.Count == 0) //if has no unvisited neighbours
{
stack.Pop(); //pop that cell (remove from stack) - it makes previous cell in the stack the current node
}
else //else link neighbour to cur.cell and push in stack
{
MazeCell neighbour = neighbours[Random.Range(0, neighbours.Count)]; // we can add bias => it's more possibly to choose especial neighbour (on North, for example)
currentCell.Link(neighbour);
stack.Push(neighbour);
}
}
return(grid);
}
public static T CreateMaze <T>(T grid) where T : MazeGrid
{
RowState state = new RowState(grid);
MazeCell cell = grid.GetRandomCell();
float chanceToLinkInRow = 0.5f;
float chanceToLinkBetweenRows = 0.35f;
for (int z = 0; z < grid.height; z++)
{
for (int x = 1; x < grid.width; x++)
{
cell = grid.GetCell(x, grid.height - 1 - z);
int currentSet = state.SetFor(z, cell);
int currentPriorSet = state.SetFor(z, cell.West);
bool shouldLink = currentSet != currentPriorSet && (cell.South == null || Random.value < chanceToLinkInRow);
if (shouldLink)
{
cell.Link(cell.West);
state.MergeSets(z, cell.West, cell);
}
}
if (cell.South != null)
{
var sets = state.SetsInRow(z);
for (int i = 0; i < sets.Count; i++)
{
var cells = Shuffle(state.CellsInSetInRow(z, sets[i]), (int)(Random.value * int.MaxValue));
for (int j = 0; j < cells.Count; j++)
{
if (j == 0 || Random.value < chanceToLinkBetweenRows)
{
cell = cells[j];
cell.Link(cell.South);
state.Record(z + 1, state.SetFor(z, cell), cell.South);
}
}
}
}
}
return(grid);
}
public void MergeSets(MazeCell lvalue, MazeCell rvalue)
{
lvalue.Link(rvalue);
int setToMergeUsing = setsForCells[rvalue];
int setToMergeInto = setsForCells[lvalue];
for (int i = 0; i < setsForCells.Count; i++)
{
if (setsForCells[setsKeys[i]] == setToMergeUsing)
{
setsForCells[setsKeys[i]] = setToMergeInto;
}
}
}
// Implements Random Walkers
public static T CreateMaze <T>(T grid) where T : MazeGrid
{
// Get random initial cell
MazeCell currentCell = grid.GetRandomCell();
int unvisitedCellsCount = grid.size - 1;
// Random walks until visit all cells. Takes long time 'cause can walk on visited cells => possibility to hang around
while (unvisitedCellsCount > 0)
{
var neighbourCell = currentCell.GetRandomNeighbour();
if (neighbourCell.Links().Count == 0) //if current cell hasn't yet been linked to any other cell.
{
currentCell.Link(neighbourCell);
unvisitedCellsCount--;
}
currentCell = neighbourCell;
}
return(grid);
}
public static T CreateMaze <T>(T grid, MazeSidewinderSettings settings) where T : MazeGrid
{
// Random Generator
Random.State initialState = Random.state;
if (settings.useFixedSeed)
{
Random.InitState(settings.seed.GetHashCode());
}
else
{
Random.InitState(Time.time.ToString().GetHashCode());
}
Direction vertical = settings.verticalCarveDirectionNorth ? (Direction.North) : (Direction.South);
Direction horizontal = settings.horizontalCarveDirectionEast ? (Direction.East) : (Direction.West);
foreach (MazeCell[] cellRow in grid.EachRow(vertical, horizontal))
{
List <MazeCell> row = new List <MazeCell>();
foreach (MazeCell cell in cellRow)
{
if (cell == null)
{
continue;
}
row.Add(cell);
//check if is out of width / height to avoid carve walls
bool atVerticalBoundary = settings.verticalCarveDirectionNorth ? (cell.North == null) : (cell.South == null);
bool atHorizontalBoundary = settings.horizontalCarveDirectionEast ? (cell.East == null) : (cell.West == null);
bool carveMainDirection;
if (settings.isVerticalDirectionMain)
{
carveMainDirection = atHorizontalBoundary || (!atVerticalBoundary && Random.value < settings.chanceToCarveOutMain);
}
else
{
carveMainDirection = atVerticalBoundary || (!atHorizontalBoundary && Random.value < settings.chanceToCarveOutMain);
}
if (carveMainDirection)
{
MazeCell member = row[Random.Range(0, row.Count)]; //get random cell in a row
if (settings.isVerticalDirectionMain)
{
if (settings.verticalCarveDirectionNorth)
{
if (member.North != null) //if has neighbour at North => carve out wall
{
member.Link(member.North);
}
}
else
{
if (member.South != null)
{
member.Link(member.South);
}
}
}
else
{
if (settings.horizontalCarveDirectionEast)
{
if (member.East != null)
{
member.Link(member.East);
}
}
else
{
if (member.West != null)
{
member.Link(member.West);
}
}
}
row.Clear(); // Clear row
}
else // if not carve north - break walls in horizontal axis between cells on row
{
if (settings.isVerticalDirectionMain)
{
if (settings.horizontalCarveDirectionEast)
{
cell.Link(cell.East);
}
else
{
cell.Link(cell.West);
}
}
else
{
if (settings.verticalCarveDirectionNorth)
{
cell.Link(cell.North);
}
else
{
cell.Link(cell.South);
}
}
}
}
}
Random.state = initialState;
return(grid);
}
