public GameBoard AfterMove(Square square)
{
Debug.Assert(_legalMoves.Contains(square));
GameBoard nextPosition = new GameBoard();
nextPosition._moveIndex = _moveIndex + 1;
nextPosition._pieces = new PieceColor[NumberOfSquares];
Array.Copy(_pieces, nextPosition._pieces, NumberOfSquares);
List<Square> capturedPieces = FlankedSquares(square).ToList();
foreach (Square capturedPiece in capturedPieces)
nextPosition._pieces[capturedPiece.Index] = _toMove;
nextPosition._pieces[square.Index] = _toMove;
nextPosition._toMove = GetOpposite();
nextPosition.UpdateLegalMoves();
return nextPosition;
}
private IEnumerable<Square> FlankedSquaresInDirection(Square square, int deltaRow, int deltaColumn)
{
Square step = NextSquare(square, deltaRow, deltaColumn);
PieceColor opposite = GetOpposite();
if (step.IsOnBoard && _pieces[step.Index] == opposite)
{
List<Square> flankedPieces = new List<Square>();
flankedPieces.Add(step);
step = NextSquare(step, deltaRow, deltaColumn);
while (step.IsOnBoard)
{
if (_pieces[step.Index] == _toMove)
return flankedPieces;
if (_pieces[step.Index] == PieceColor.Empty)
return Enumerable.Empty<Square>();
flankedPieces.Add(step);
step = NextSquare(step, deltaRow, deltaColumn);
}
return Enumerable.Empty<Square>();
}
return Enumerable.Empty<Square>();
}
private bool IsLegalMove(Square square)
{
return FlankedSquares(square).Any();
}
public void MakeMove(Square square)
{
_depGameBoard.OnGet();
if (MyTurn && _gameBoard.LegalMoves.Contains(square))
{
_player.MakeMove(_gameBoard.MoveIndex, square.Index);
_depGameBoard.OnGet();
if (_gameBoard.ToMove == PieceColor.Empty)
{
int blackCount = _gameBoard.BlackCount;
int whiteCount = _gameBoard.WhiteCount;
if (blackCount > whiteCount)
_player.Game.DeclareWinner(_player.Game.Players.Single(p => p.Index == 0), false);
else if (blackCount < whiteCount)
_player.Game.DeclareWinner(_player.Game.Players.Single(p => p.Index == 1), false);
else
_player.Game.DeclareWinner(null, false);
}
}
}
private static Square NextSquare(Square from, int deltaRow, int deltaColumn)
{
return Square.FromCoordinates(from.Row + deltaRow, from.Column + deltaColumn);
}
public bool IsPreviewCede(Square square)
{
return PreviewBoard.LegalMoves.Contains(square);
}
public void MakeMove(Square square)
{
_mainNavigation.PreviewMove = null;
_depGameBoard.OnGet();
if (_mainNavigation.PendingMove == null && MyTurn && _gameBoard.LegalMoves.Contains(square))
{
_mainNavigation.PendingMoveIndex = _gameBoard.MoveIndex;
_mainNavigation.PendingMove = square;
}
}
public PieceColor PieceAt(Square square)
{
GameBoard gameBoard = GetGameBoard();
return gameBoard == null ? PieceColor.Empty : gameBoard.PieceAt(square);
}
public SquareViewModel(GameState gameState, Square square)
{
_gameState = gameState;
_square = square;
}
public bool IsPriorMove(Square square)
{
GameBoard gameBoard = GetGameBoard();
GameBoard priorBoard = GetPriorBoard();
return
_mainNavigation.PreviewMove == null &&
priorBoard.PieceAt(square) == PieceColor.Empty &&
gameBoard.PieceAt(square) != PieceColor.Empty;
}
public void MakeMove(Square square)
{
_mainNavigation.PreviewMove = null;
GameBoard gameBoard = GetGameBoard();
if (_mainNavigation.PendingMove == null && gameBoard.LegalMoves.Contains(square))
{
_mainNavigation.PendingMoveIndex = gameBoard.MoveIndex;
_mainNavigation.PendingMove = square;
}
}
public bool IsPreviewCede(Square square)
{
GameBoard previewBoard = GetPreviewBoard();
return
previewBoard.LegalMoves.Contains(square);
}
public bool IsPreviewCapture(Square square)
{
GameBoard gameBoard = GetGameBoard();
GameBoard previewBoard = GetPreviewBoard();
return
_mainNavigation.PreviewMove != square &&
gameBoard.PieceAt(square) != previewBoard.PieceAt(square);
}
public LocalSquareViewModel(LocalGameState gameState, Square square)
{
_gameState = gameState;
_square = square;
}
public PieceColor PieceAt(Square square)
{
return _pieces[square.Index];
}
public override string ToString()
{
StringBuilder boardPosition = new StringBuilder();
for (int row = 0; row < Square.NumberOfRows; row++)
{
for (int column = 0; column < Square.NumberOfColumns; column++)
{
Square square = new Square(row, column);
var piece = _pieces[square.Index];
boardPosition.Append(
piece == PieceColor.Black ? "B" :
piece == PieceColor.White ? "W" : ".");
}
boardPosition.AppendLine();
}
return boardPosition.ToString();
}
public bool IsPreviewCapture(Square square)
{
return
_mainNavigation.PreviewMove != square &&
_gameBoard.PieceAt(square) != PreviewBoard.PieceAt(square);
}
private static Square NextSquare(Square from, int deltaRow, int deltaColumn)
{
return new Square(from.Row + deltaRow, from.Column + deltaColumn);
}
public bool IsPriorMove(Square square)
{
_depGameBoard.OnGet();
return
_mainNavigation.PreviewMove == null &&
_priorBoard.PieceAt(square) == PieceColor.Empty &&
_gameBoard.PieceAt(square) != PieceColor.Empty;
}
private IEnumerable<Square> EvaluateLegalMoves()
{
for (int row = 0; row < Square.NumberOfRows; row++)
{
for (int column = 0; column < Square.NumberOfColumns; column++)
{
Square square = new Square(row, column);
if (IsLegalMove(square))
yield return square;
}
}
}
public bool SetPreviewMove(Square square)
{
_depGameBoard.OnGet();
if (square != null && !_gameBoard.LegalMoves.Contains(square))
square = null;
if (!Object.Equals(_mainNavigation.PreviewMove, square))
{
_mainNavigation.PreviewMove = square;
return square != null;
}
return false;
}
private IEnumerable<Square> FlankedSquares(Square center)
{
if (_pieces[center.Index] == PieceColor.Empty)
{
for (int direction = 0; direction < 9; direction++)
{
int deltaRow = (direction / 3) - 1;
int deltaColumn = (direction % 3) - 1;
if (deltaRow != 0 || deltaColumn != 0)
foreach (Square square in FlankedSquaresInDirection(center, deltaRow, deltaColumn))
yield return square;
}
}
}
public PieceColor PieceAt(Square square)
{
_depGameBoard.OnGet();
return _gameBoard == null ? PieceColor.Empty : _gameBoard.PieceAt(square);
}
public RemoteSquareViewModel(RemoteGameState gameState, Square square)
{
_gameState = gameState;
_square = square;
}