// 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;
}
}
}
