private static List<Position> GetPossibleDirections(Position position, Labyrinth labyrinth)
{
var possibleDirections = new List<Position>();
var left = position.Left;
var right = position.Right;
var down = position.Down;
var up = position.Up;
if (labyrinth.CanMoveTo(left))
{
possibleDirections.Add(left);
}
if (labyrinth.CanMoveTo(right))
{
possibleDirections.Add(right);
}
if (labyrinth.CanMoveTo(down))
{
possibleDirections.Add(down);
}
if (labyrinth.CanMoveTo(up))
{
possibleDirections.Add(up);
}
return possibleDirections;
}
private static void GetAllPaths(Position position, Position target, Labyrinth labyrinth)
{
labyrinth.Visit(position);
if (position == target)
{
foundPaths.Add(labyrinth);
return;
}
var possibleDirections = new List<Position>
{
position.Left,
position.Right,
position.Down,
position.Up
};
foreach (var direction in possibleDirections)
{
if (labyrinth.CanMoveTo(direction))
{
var newLabyrinth = new Labyrinth(labyrinth.Matrix, new HashSet<Position>(labyrinth.Visited));
GetAllPaths(direction, target, newLabyrinth);
}
}
}
public char this[Position position]
{
get
{
return this.matrix[position.Row, position.Col];
}
private set
{
this.matrix[position.Row, position.Col] = value;
}
}
public bool CanMoveTo(Position position)
{
if (position.Row < 0 || position.Row >= this.matrix.GetLength(0))
{
return false;
}
if (position.Col < 0 || position.Col >= this.matrix.GetLength(1))
{
return false;
}
if (this[position] != '0')
{
return false;
}
return true;
}
static void Main()
{
var startPosition = new Position(0, 0);
var targetPosition = new Position(5, 5);
Console.WriteLine("Start position: {0}", startPosition);
Console.WriteLine("Start position: {0}", targetPosition);
var matrix = new char[6, 6]
{
{'0','0','0','x','0','x'},
{'0','x','0','0','0','x'},
{'0','0','x','x','0','0'},
{'0','x','0','0','0','0'},
{'0','0','0','x','x','0'},
{'0','0','0','x','x','0'}
};
var matrixReloaded = new char[6, 6]
{
{'0','0','0','0','0','0'},
{'0','x','0','x','0','x'},
{'0','x','0','x','0','x'},
{'0','x','0','x','0','x'},
{'0','x','0','x','0','x'},
{'0','0','0','0','0','0'}
};
var labirynth = new Labyrinth(matrixReloaded);
Console.WriteLine("Labyrinth:");
Console.WriteLine(labirynth);
GetAllPaths(startPosition, targetPosition, labirynth);
foreach (var path in foundPaths)
{
path.PrintVisited();
Console.WriteLine();
}
}
private bool IsVisited(Position position)
{
var isVisited = this.visited.Contains<Position>(position);
return isVisited;
}
public void Visit(Position position)
{
this.visited.Add(position);
}
private static void PathAvailable(Position position, Position target, Labyrinth labyrinth)
{
if (position == target)
{
pathFound = true;
}
labyrinth.Visit(position);
var possibleDirections = GetPossibleDirections(position, labyrinth);
foreach (var direction in possibleDirections)
{
if (labyrinth.CanMoveTo(direction) && !pathFound)
{
PathAvailable(direction, target, labyrinth);
}
}
}
static void Main()
{
var matrixA = new char[6, 6]
{
{'0','0','0','x','0','x'},
{'0','x','0','0','0','x'},
{'0','0','x','x','0','0'},
{'0','x','0','0','0','0'},
{'0','0','0','x','x','0'},
{'0','0','0','x','x','0'}
};
var matrixB = new char[6, 6]
{
{'0','0','0','0','0','0'},
{'0','x','0','x','0','x'},
{'0','x','0','x','0','x'},
{'0','x','0','x','x','0'},
{'0','x','0','x','0','0'},
{'0','0','0','x','0','0'}
};
var matrixC = CreateEmptyMatrix(92, 92);
var matrix = matrixB; // Change the matrix
var labirynth = new Labyrinth(matrix);
var startPosition = new Position(0, 0);
var targetPosition = new Position(matrix.GetLength(0) - 1, matrix.GetLength(1) - 1);
PathAvailable(startPosition, targetPosition, labirynth);
Console.WriteLine("Path available: {0}", pathFound);
}
public void Visit(Position position)
{
this[position] = 'v';
}