public SquareNode(BoardNode board, Piece.Colour colour, Position position)
{
Board = board;
Colour = colour;
Position = position;
}
private void OnCheckmate(Piece.Colour winner)
{
GetNode <Control>("Checkmate").Visible = true;
var whoLabel = GetNode <Label>("Checkmate/Who");
whoLabel.Text = $"{winner} wins!";
}
/// <summary>
/// Returns true if a piece at "position" can be taken by a piece owned by "from"
/// </summary>
/// <param name="position"></param>
/// <param name="from"></param>
/// <returns></returns>
public bool UnderAttack(Position position, Piece.Colour from)
{
foreach (var move in _GetMoves(from))
{
if (move.To == position)
{
return(true);
}
}
return(false);
}
public HumanPlayer(BoardNode board, Piece.Colour colour) : base(board, colour)
{
SquareClickedTcs = new TaskCompletionSource <Position>();
board.SquareClicked += p =>
{
if (Board.CurrentPlayer != Colour)
{
return;
}
SquareClickedTcs.SetResult(p);
SquareClickedTcs = new TaskCompletionSource <Position>();
};
}
public Position KingPosition(Piece.Colour player)
{
for (int i = 0; i < Size; i++)
{
for (int j = 0; j < Size; j++)
{
var position = new Position(j, i);
if (this[position] is Piece piece)
{
if (piece.Type == Piece.PieceType.King && piece.Owner == player)
{
return(position);
}
}
}
}
throw new ApplicationException($"{player} does not have a king");
}
public IEnumerable <Move> GetMoves(Piece.Colour player)
{
var moves = GetPositions(player)
.Select(position => GetMoves(position))
.SelectMany(x => x);
if (!moves.Any())
{
var kingpos = KingPosition(player);
if (UnderAttack(kingpos, player.Opposite()))
{
Checkmate?.Invoke(player.Opposite());
}
else
{
Stalemate?.Invoke();
}
}
return(moves);
}
/// <summary>
/// The more pieces "player" has, the more points they have.
/// </summary>
/// <param name="player"></param>
/// <returns></returns>
private float ScoreMaterial(Piece.Colour player)
{
var material = Board.GetPositions(player);
float score = 0;
foreach (var position in material)
{
switch (Board[position].Value.Type)
{
case Piece.PieceType.Pawn:
score += Constants.PawnScore;
break;
case Piece.PieceType.Knight:
score += Constants.KnightScore;
break;
case Piece.PieceType.Bishop:
score += Constants.BishopScore;
break;
case Piece.PieceType.Rook:
score += Constants.RookScore;
break;
case Piece.PieceType.Queen:
score += Constants.QueenScore;
break;
default:
break;
}
}
return(score);
}
protected Player(BoardNode board, Piece.Colour colour)
{
Board = board;
Colour = colour;
}
private Player CreatePlayer(PlayerTypeSelector.PlayerType type, BoardNode board, Piece.Colour colour)
{
switch (type)
{
case PlayerTypeSelector.PlayerType.Human:
return(new HumanPlayer(board, colour));
case PlayerTypeSelector.PlayerType.Computer:
return(new AIPlayer(board, colour));
case PlayerTypeSelector.PlayerType.Random:
return(new RandomPlayer(board, colour));
default:
throw new ApplicationException($"Invalid player type {type}");
}
}
public MoveChooser(Piece.Colour player)
{
Player = player;
History = new List <Move>();
}
public static float Score(Board board, Piece.Colour player, AIConstants constants)
{
return(new BoardScorer(board, player, constants).Score());
}
public BoardScorer(Board board, Piece.Colour player, AIConstants constants)
{
Board = board;
Player = player;
Constants = constants;
}
public async override void _Ready()
{
bool gameRunning = true;
Board = new Board();
Board.Checkmate += winner =>
{
gameRunning = false;
GD.Print($"Checkmate! {winner} wins.");
Checkmate?.Invoke(winner);
};
Board.Stalemate += () =>
{
gameRunning = false;
GD.Print("Stalemate!");
Stalemate?.Invoke();
};
UI = GetNode <UI>("UI");
var squares = GetNode <Control>("Squares");
var colour = Piece.Colour.Black;
for (int i = 0; i < Board.Size; i++)
{
for (int j = 0; j < Board.Size; j++)
{
var square = new SquareNode(this, colour, new Position(j, i));
square.Clicked += position =>
{
SquareClicked?.Invoke(position);
};
Squares[j, i] = square;
squares.AddChild(square);
colour = colour.Opposite();
}
colour = colour.Opposite();
}
// WhitePlayer = new HumanPlayer(this, Piece.Colour.White);
//BlackPlayer = new HumanPlayer(this, Piece.Colour.Black);
//WhitePlayer = new RandomPlayer(this, Piece.Colour.White);
//BlackPlayer = new RandomPlayer(this, Piece.Colour.Black);
//WhitePlayer = new AIPlayer(this, Piece.Colour.White);
// BlackPlayer = new AIPlayer(this, Piece.Colour.Black);
var drawer = new PieceDrawer(this);
squares.AddChild(drawer);
CurrentPlayer = Piece.Colour.White;
while (true)
{
LegalMoves = Board.GetMoves(CurrentPlayer).ToHashSet();
if (!gameRunning)
{
break;
}
var move = await Current.GetMoveAsync();
await Task.Delay(10);
GD.Print($"{CurrentPlayer} wants to move {move}");
await Task.Run(() => Board.DoMove(move, p => Current.Promote(p).Result));
drawer.Update();
CurrentPlayer = CurrentPlayer.Opposite();
}
}
public AIPlayer(BoardNode board, Piece.Colour colour) : base(board, colour)
{
MoveChooser = new MoveChooser(colour);
Constants = AIConstants.Default;
}
public IEnumerable <Move> _GetMoves(Piece.Colour player)
{
return(GetPositions(player)
.Select(position => _GetMoves(position).Select(p => new Move(position, p)))
.SelectMany(x => x));
}
public RandomPlayer(BoardNode board, Piece.Colour colour) : base(board, colour)
{
Random = new Random();
}
public IEnumerable <Position> GetPositions(Piece.Colour player)
{
return(GetPositions().Where(position => this[position].Value.Owner == player));
}
public static Piece.Colour Opposite(this Piece.Colour colour)
{
return(colour == Piece.Colour.White ? Piece.Colour.Black : Piece.Colour.White);
}