private Piece GetPieceAtSquare(ChessBoardCoord square)
{
byte ret = (byte)(_board[square.BoardX, square.BoardY] & (1 << LOWER_PIECETYPE_BIT));
ret |= (byte)(_board[square.BoardX, square.BoardY] & (1 << MIDDLE_PIECETYPE_BIT));
ret |= (byte)(_board[square.BoardX, square.BoardY] & (1 << UPPER_PIECETYPE_BIT));
return((Piece)ret);
}
internal static bool CheckValidMove(Piece movingPiece,
PieceColor movingPieceColor,
bool movingPieceFirstMove,
ChessBoardCoord origin,
Piece destinationPiece,
PieceColor destinationPieceColor,
ChessBoardCoord destination)
{
return(false);
}
/// <summary>
/// Debugging function, remove later...
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public string GetPieceVisualizationString(ChessBoardCoord selectedSquare)
{
byte square = _board[selectedSquare.BoardX, selectedSquare.BoardY];
if (square == 0xFF)
{
return("II");
}
else if (square == 0x00)
{
return("00");
}
PieceColor color = GetPieceColorAtSquare(selectedSquare);
Piece piece = GetPieceAtSquare(selectedSquare);
string ret = "";
switch (color)
{
case PieceColor.Black:
ret += "B";
break;
case PieceColor.White:
ret += "W";
break;
}
switch (piece)
{
case Piece.Pawn:
ret += "P";
break;
case Piece.Knight:
ret += "N";
break;
case Piece.Bishop:
ret += "B";
break;
case Piece.Rook:
ret += "R";
break;
case Piece.Queen:
ret += "Q";
break;
case Piece.King:
ret += "K";
break;
}
return(ret);
}
public bool Move(ChessBoardCoord origin, ChessBoardCoord destination)
{
if (!IsSaneMove(origin, destination) || !IsPathClear(origin, destination))
{
return(false);
}
SetSquare(GetPieceAtSquare(origin), GetPieceColorAtSquare(origin), destination);
ClearSquare(origin);
SetMoved(destination);
return(true);
}
private void SetSquare(Piece piece, ChessBoardCoord square)
{
switch ((int)piece)
{
case 0:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << LOWER_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << MIDDLE_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << UPPER_PIECETYPE_BIT));
break;
case 1:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << LOWER_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << MIDDLE_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << UPPER_PIECETYPE_BIT));
break;
case 2:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << LOWER_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << MIDDLE_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << UPPER_PIECETYPE_BIT));
break;
case 3:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << LOWER_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << MIDDLE_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << UPPER_PIECETYPE_BIT));
break;
case 4:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << LOWER_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << MIDDLE_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << UPPER_PIECETYPE_BIT));
break;
case 5:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << LOWER_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << MIDDLE_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << UPPER_PIECETYPE_BIT));
break;
case 6:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << LOWER_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << MIDDLE_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << UPPER_PIECETYPE_BIT));
break;
case 7:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << LOWER_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << MIDDLE_PIECETYPE_BIT));
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << UPPER_PIECETYPE_BIT));
break;
}
}
private void SetSquare(PieceColor color, ChessBoardCoord square)
{
switch ((int)color)
{
case 0:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] & ~(1 << PIECE_COLOR_BIT));
break;
case 1:
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << PIECE_COLOR_BIT));
break;
}
}
private bool IsSaneMove(ChessBoardCoord origin, ChessBoardCoord destination)
{
if (_board[origin.BoardX, origin.BoardY] == EMPTY_SQUARE ||
_board[origin.BoardX, origin.BoardY] == INVALID_SQUARE ||
_board[origin.BoardX, origin.BoardY] == INVALID_SQUARE)
{
return(false);
}
if (GetPieceColorAtSquare(origin) == GetPieceColorAtSquare(destination))
{
return(false);
}
return(true);
}
private PieceColor GetPieceColorAtSquare(ChessBoardCoord square)
{
if (_board[square.BoardX, square.BoardY] == EMPTY_SQUARE)
{
return(PieceColor.EmptySquare);
}
if ((byte)(_board[square.BoardX, square.BoardY] & (1 << PIECE_COLOR_BIT)) != 0)
{
return((PieceColor)1);
}
else
{
return(0);
}
}
private bool IsPathClear(ChessBoardCoord origin, ChessBoardCoord destination)
{
if (origin.BoardX == destination.BoardX)
{
for (int i = (origin.BoardY + 1); i < (destination.BoardY); i++)
{
if (_board[origin.BoardX, i] != EMPTY_SQUARE)
{
return(false);
}
}
}
else if (origin.BoardY == destination.BoardY)
{
for (int i = (origin.BoardX); i < destination.BoardX; i++)
{
if (_board[i, origin.BoardY] != EMPTY_SQUARE)
{
return(false);
}
}
}
else if (Math.Abs(destination.BoardX - origin.BoardX) == Math.Abs(destination.BoardY - origin.BoardY))
{
for (int i = (origin.BoardX + 1), j = (origin.BoardY + 1); i < destination.BoardX; i++, j++)
{
if (_board[i, j] != EMPTY_SQUARE)
{
return(false);
}
}
}
else
{
return(false);
}
return(true);
}
internal static bool ValidMoveForPiece(Piece movingPiece,
PieceColor movingPieceColor,
bool movingPieceFirstMove,
Piece destinationPiece,
ChessBoardCoord origin,
ChessBoardCoord destination)
{
switch (movingPiece)
{
case Piece.Pawn:
{
//Average case
if (destination.Y == origin.Y + 1)
{
if (movingPieceColor == PieceColor.White &&
destinationPiece == Piece.NoPiece)
{
return(true);
}
return(false);
}
else if (destination.X == origin.X - 1)
{
if (movingPieceColor == PieceColor.Black &&
destinationPiece == Piece.NoPiece)
{
return(true);
}
return(false);
}
//Initial Move case
else if ((destination.Y == origin.Y + 2))
{
if (movingPieceColor == PieceColor.White &&
movingPieceFirstMove &&
destinationPiece == Piece.NoPiece)
{
return(true);
}
return(false);
}
else if ((destination.Y == origin.Y - 2))
{
if (movingPieceColor == PieceColor.Black &&
movingPieceFirstMove &&
destinationPiece == Piece.NoPiece)
{
return(true);
}
return(false);
}
//Capture case
else if (((destination.X == origin.X + 1) || (destination.X == origin.X - 1)) &&
(destination.Y == origin.Y + 1) &&
(movingPieceColor == PieceColor.White) &&
(destinationPiece != Piece.NoPiece))
{
return(true);
}
else if (((destination.X == origin.X + 1) || (destination.X == origin.X - 1)) &&
(destination.Y == origin.Y - 1) &&
(movingPieceColor == PieceColor.Black) &&
(destinationPiece != Piece.NoPiece))
{
return(true);
}
//En passant
return(false);
}
default:
return(false);
}
}
private void ClearSquare(ChessBoardCoord square)
{
_board[square.BoardX, square.BoardY] = 0;
}
private void SetSquare(Piece piece, PieceColor color, ChessBoardCoord square)
{
SetSquare(piece, square);
SetSquare(color, square);
}
private void SetMoved(ChessBoardCoord square)
{
_board[square.BoardX, square.BoardY] = (byte)(_board[square.BoardX, square.BoardY] | (1 << PIECE_MOVED_BIT));
}