// goes through all the MazeParts + another horizontal and vertical row
// creates a wall if the wall is not open for these mazeparts
private void CreateWalls()
{
for (int x = 0; x < maze.GetLength(0); x++)
{
for (int y = 0; y < maze.GetLength(1); y++)
{
MazePart mazePart = maze[x, y];
// wallOpen array goes clockwise starting from the left (0 = left, 1 = top, 2 = right, 3 = bottom)
if (!mazePart.wallOpen[(int)Direction.Left])
{
CreateWall(Direction.Left, x, y);
}
if (!mazePart.wallOpen[(int)Direction.Up])
{
CreateWall(Direction.Up, x, y);
}
// for the last vertical row
if (x == maze.GetLength(0) - 1 &&
!mazePart.wallOpen[(int)Direction.Right])
{
CreateWall(Direction.Right, x, y);
}
// for the last horizontal row
if (y == 0 &&
!mazePart.wallOpen[(int)Direction.Down])
{
CreateWall(Direction.Down, x, y);
}
}
}
}
// will generate a maze with the specified width, height, and chosen algorithm
// after the maze is generated a piece of fruit is placed at the end of the longest path
// finally the walls are placed
public void GenerateMaze(int width, int height, Algorithm algorithm)
{
if (maze != null)
{
DestroyPreviousMaze();
}
CreateMaze(width, height);
fruitMazePart = maze[0, 0];
switch (algorithm)
{
case Algorithm.Iterative:
DepthFirstIterativeImplementation();
break;
case Algorithm.Recursive:
DepthFirstRecursiveImplementation(maze[0, 0], 1);
break;
}
fruitMazePart.hasFruit = true;
fruit = Instantiate(fruitPrefab, fruitMazePart.transform.position, new Quaternion(0, 0, 0, 0));
CreateWalls();
}
public Maze(string input)
{
var lines = input.SplitNewLine();
_mazeWidth = lines[0].Length;
_mazeHeight = lines.Length;
_maze = new MazePart[_mazeWidth, _mazeHeight];
for (int y = 0; y < lines.Length; y++)
{
for (int x = 0; x < lines[y].Length; x++)
{
char c = lines[y][x];
if (char.IsDigit(c))
{
Points.Add((new Vector2i(x, y), int.Parse(c.ToString())));
_maze[x, y] = MazePart.Digit;
}
else if (c == '#')
{
_maze[x, y] = MazePart.Wall;
}
else
{
_maze[x, y] = MazePart.Empty;
}
}
}
}
public void SpawnPlayer(MazePart mazePart)
{
currentPlayerCharacter = Instantiate(playerCharacterPrefab, mazePart.transform.position, new Quaternion(0, 0, 0, 0));
currentPlayerCharacter.currentMazePart = mazePart;
gameStarted = true;
// just in case the player generates a 1 x 1 maze
CheckForPlayerWinOrLoss(mazePart);
}
// will call GameOver function if the player character comes into contact with water (loss) or fruit (win)
public void CheckForPlayerWinOrLoss(MazePart potentiallyUnderWaterMazePart)
{
if (potentiallyUnderWaterMazePart.hasFruit && potentiallyUnderWaterMazePart == currentPlayerCharacter.currentMazePart)
{
StopWaterSpreadingCoroutines();
gameStarted = false;
localUIManager.GameOver(true);
}
else if (potentiallyUnderWaterMazePart.UnderWater && potentiallyUnderWaterMazePart == currentPlayerCharacter.currentMazePart)
{
StopWaterSpreadingCoroutines();
gameStarted = false;
localUIManager.GameOver(false);
}
}
// will move the player character in the specified direction,
// except if the new place would be outside the grid or there is a wall between the current MazePart and its neighbour
private IEnumerator TryMoveInDirection(Direction direction)
{
enoughTimeSinceLastMovement = false;
PlayerCharacter currentPlayerCharacter = localPlayerManager.currentPlayerCharacter;
MazePart potentialNewMazePart = NextMazePart(currentPlayerCharacter, direction);
if (potentialNewMazePart != null)
{
currentPlayerCharacter.Move(potentialNewMazePart, direction);
}
yield return(waitForSeconds); //0.15f "cooldown" period before the player can move again
enoughTimeSinceLastMovement = true;
}
// iterative implementation of randomised depth first algorithm
private void DepthFirstIterativeImplementation()
{
Stack mazeStack = new Stack();
// mark as visited, push to stack
maze[0, 0].visited = true;
mazeStack.Push(maze[0, 0]);
while (mazeStack.Count > 0)
{
MazePart currentMazePart = (MazePart)mazeStack.Pop();
List <MazePart> currentMazePartUnvistedNeighbours = currentMazePart.GetAllUnvistedNeighbours(maze);
if (currentMazePartUnvistedNeighbours.Count > 0)
{
// push current cell to stack
mazeStack.Push(currentMazePart);
// choose unvisited neighbour
MazePart chosenNeighbour = currentMazePartUnvistedNeighbours[random.Next(0, currentMazePartUnvistedNeighbours.Count)];
// remove wall
chosenNeighbour.RemoveWall(currentMazePart);
// mark chosenNeighbour visited
chosenNeighbour.visited = true;
mazeStack.Push(chosenNeighbour);
// keep track of pathLength to put fruit at the end of the longest path
chosenNeighbour.pathLength = currentMazePart.pathLength + 1;
}
// the longest path in the maze gets a piece of fruit as the end goal for the player
else
{
if (currentMazePart.pathLength > fruitMazePart.pathLength)
{
fruitMazePart = currentMazePart;
}
}
}
}
// recursive implementation of randomised depth first algorithm
private void DepthFirstRecursiveImplementation(MazePart currentMazePart, int pathLength)
{
// added a pathLength tracker to put fruit at the end of the longest path after the maze is finished
currentMazePart.pathLength = pathLength;
if (currentMazePart.pathLength > fruitMazePart.pathLength)
{
fruitMazePart = currentMazePart;
}
// mark as visited
currentMazePart.visited = true;
// read comment in the else for why "true" is put as a condition
while (true)
{
// get a list of all unvisitedNeighbours of this MazePart
List <MazePart> currentMazePartUnvistedNeighbours = currentMazePart.GetAllUnvistedNeighbours(maze);
if (currentMazePartUnvistedNeighbours.Count > 0)
{
// choose random unvisted neighbour, then remove it from the list
MazePart chosenNeighbour = currentMazePartUnvistedNeighbours[random.Next(0, currentMazePartUnvistedNeighbours.Count)];
currentMazePartUnvistedNeighbours.Remove(chosenNeighbour);
// remove wall between chosenNeighbour and currentMazePart
currentMazePart.RemoveWall(chosenNeighbour);
// call this function with chosenNeighbour
DepthFirstRecursiveImplementation(chosenNeighbour, pathLength + 1);
}
// when there are no more unvisted neighbours for currentMazePart,
// break out of the while loop.
else
{
// I understand this isn't the nicest way to do it but it works well,
// and currentMazePartUnvistedNeighbours.Count > 0 should not be put as a condition,
// because there could be (will be) MazeParts in that list that have been changed (visited) by a deeper call of this function.
break;
}
}
}
