private bool TryGetUserMove(Coordinate from, Coordinate to, out Move move)
{
ReadOnlyCollection<Move> possibleMoves = m_gameState.GenerateMoves();
move = possibleMoves.SingleOrDefault(x => x.From.File == from.File && x.From.Rank == from.Rank && x.To.File == to.File && x.To.Rank == to.Rank);
return move != null;
}
public bool MakeMove(Move move)
{
bool isLegalMove = GenerateMoves().Any(x =>
x.MoveType == move.MoveType &&
x.PromoteTo == move.PromoteTo &&
((x.From == null && move.From == null) || (x.From != null && move.From != null && x.From.File == move.From.File && x.From.Rank == move.From.Rank)) &&
((x.To == null && move.To == null) || (x.To != null && move.To != null && x.To.File == move.To.File && x.To.Rank == move.To.Rank)));
if (!isLegalMove)
throw new ArgumentException("illegal move");
switch (move.MoveType)
{
case MoveType.Standard:
Piece pieceToMove = Board[move.From.BoardRow(), move.From.BoardColumn()].Piece;
Board[move.To.BoardRow(), move.To.BoardColumn()].Piece = Board[move.From.BoardRow(), move.From.BoardColumn()].Piece;
Board[move.From.BoardRow(), move.From.BoardColumn()].Piece = null;
if (pieceToMove.Type == PieceType.King)
{
m_whiteKingMoved |= pieceToMove.Color == Color.White;
m_blackKingMoved |= pieceToMove.Color == Color.Black;
}
else if (pieceToMove.Type == PieceType.Rook)
{
m_whiteQueenRookMoved |= pieceToMove.Color == Color.White && move.From.BoardRow() == 0 && move.From.BoardColumn() == 0;
m_whiteKingRookMoved |= pieceToMove.Color == Color.White && move.From.BoardRow() == 0 && move.From.BoardColumn() == 7;
m_blackQueenRookMoved |= pieceToMove.Color == Color.Black && move.From.BoardRow() == 7 && move.From.BoardColumn() == 0;
m_blackKingRookMoved |= pieceToMove.Color == Color.Black && move.From.BoardRow() == 7 && move.From.BoardColumn() == 7;
}
break;
case MoveType.PawnStart:
m_enPassantColumn = move.From.BoardColumn();
Board[move.To.BoardRow(), move.To.BoardColumn()].Piece = Board[move.From.BoardRow(), move.From.BoardColumn()].Piece;
Board[move.From.BoardRow(), move.From.BoardColumn()].Piece = null;
break;
case MoveType.EnPassant:
int rowOffset = m_playerTurn == Color.White ? -1 : 1;
Board[move.To.BoardRow(), move.To.BoardColumn()].Piece = Board[move.From.BoardRow(), move.From.BoardColumn()].Piece;
Board[move.From.BoardRow(), move.From.BoardColumn()].Piece = null;
Board[move.To.BoardRow() + rowOffset, move.To.BoardColumn()].Piece = null;
break;
case MoveType.Promotion:
Board[move.To.BoardRow(), move.To.BoardColumn()].Piece = move.PromoteTo;
Board[move.From.BoardRow(), move.From.BoardColumn()].Piece = null;
break;
case MoveType.CastleKingside:
int kRow = m_playerTurn == Color.White ? 0 : 7;
Board[kRow, 5].Piece = Board[kRow, 7].Piece;
Board[kRow, 6].Piece = Board[kRow, 4].Piece;
Board[kRow, 4].Piece = null;
Board[kRow, 7].Piece = null;
if (m_playerTurn == Color.White)
{
m_whiteKingMoved = true;
m_whiteKingRookMoved = true;
}
else
{
m_blackKingMoved = true;
m_blackKingRookMoved = true;
}
break;
case MoveType.CastleQueenside:
int qRow = m_playerTurn == Color.White ? 0 : 7;
Board[qRow, 2].Piece = Board[qRow, 4].Piece;
Board[qRow, 3].Piece = Board[qRow, 0].Piece;
Board[qRow, 0].Piece = null;
Board[qRow, 4].Piece = null;
if (m_playerTurn == Color.White)
{
m_whiteKingMoved = true;
m_whiteQueenRookMoved = true;
}
else
{
m_blackKingMoved = true;
m_blackQueenRookMoved = true;
}
break;
default:
throw new ArgumentOutOfRangeException("move");
}
// reset enPassant state
if (move.MoveType != MoveType.PawnStart)
m_enPassantColumn = null;
// check to see if the game is over
bool hasWhiteKing = false;
bool hasBlackKing = false;
for (int i = 0; i < Board.GetLength(0); i++)
{
for (int j = 0; j < Board.GetLength(0); j++)
{
if (Board[i, j].Piece != null && Board[i, j].Piece.Type == PieceType.King)
{
hasWhiteKing |= Board[i, j].Piece.Color == Color.White;
hasBlackKing |= Board[i, j].Piece.Color == Color.Black;
}
}
}
if (!hasWhiteKing)
GameResult = GameResult.BlackWin;
else if (!hasBlackKing)
GameResult = GameResult.WhiteWin;
PlayerTurn = m_playerTurn == Color.White ? Color.Black : Color.White;
RaisePropertyChanged(BoardProperty);
return true;
}
private bool TryGetUserMove(string moveNotation, out Move move)
{
move = null;
if (moveNotation.IsNullOrEmpty())
return false;
// castle kingside
if (moveNotation.ToLowerInvariant() == "0-0")
{
move = Move.CastleKingside(m_gameState.PlayerTurn);
return true;
}
// castle queenside
if (moveNotation.ToLowerInvariant() == "0-0-0")
{
move = Move.CastleQueenside(m_gameState.PlayerTurn);
return true;
}
if (moveNotation.Length != 5)
return false;
Coordinate from;
if (!AlgebraicNotationUtility.TryConvertToCoordinate(moveNotation.Substring(0, 2), out from))
return false;
Coordinate to;
if (!AlgebraicNotationUtility.TryConvertToCoordinate(moveNotation.Substring(3, 2), out to))
return false;
TryGetUserMove(from, to, out move);
return move != null;
}