/// <summary>
/// This method is invoked to move the scared Ghost to the random available tile.
/// Everytime a Ghost moves, we have to do two things: update the Ghost's Position
/// and update the Ghosts's Direction. This indicates the direction in which it is moving,
/// and it is required to make sure that the Ghosts doesn't turn back to it's previous
/// position (i.e., to avoid 180 degree turns) (used by the Maze class's GetAvailableNeighbours
/// method)
/// </summary>
public void Move()
{
Tile current = maze[(int)ghost.Position.X, (int)ghost.Position.Y];
List <Tile> places = maze.GetAvailableNeighbours(ghost.Position, ghost.Direction);
int num = places.Count;
if (num == 0)
{
throw new Exception("Nowhere to go");
}
Random rand = new Random();
int choice = rand.Next(num);
//determine direction
if (places[choice].Position.X == ghost.Position.X + 1)
{
ghost.Direction = Direction.Right;
}
else if (places[choice].Position.X == ghost.Position.X - 1)
{
ghost.Direction = Direction.Left;
}
else if (places[choice].Position.Y == ghost.Position.Y - 1)
{
ghost.Direction = Direction.Up;
}
else
{
ghost.Direction = Direction.Down;
}
ghost.Position = places[choice].Position;
}
/// <summary>
/// Finds the nearest path to ambush pacman
/// </summary>
public Vector2 findAdjacentTarget()
{
Tile current = maze[(int)ghost.Position.X, (int)ghost.Position.Y];
List <Tile> places = maze.GetAvailableNeighbours(ghost.Position, ghost.Direction);
int num = places.Count;
if (num == 0)
{
throw new Exception("Nowhere to go");
}
Tile shortestDistance = places[0];
for (int i = 1; i < places.Count(); i++)
{
if (places[i].GetDistance(target) < shortestDistance.GetDistance(target))
{
shortestDistance = places[i];
}
}
if (shortestDistance.Position.X == ghost.Position.X + 1)
{
ghost.Direction = Direction.Right;
}
else if (shortestDistance.Position.X == ghost.Position.X - 1)
{
ghost.Direction = Direction.Left;
}
else if (shortestDistance.Position.Y == ghost.Position.Y - 1)
{
ghost.Direction = Direction.Up;
}
else
{
ghost.Direction = Direction.Down;
}
return(shortestDistance.Position);
}