public ChessPiece(ChessPiece piece)
{
Identifier = piece.Identifier;
PieceColor = piece.PieceColor;
PieceValue = piece.PieceValue;
PieceActionValue = piece.PieceActionValue;
Moved = piece.Moved;
if (piece.ValidMoves != null)
LastValidMoveCount = piece.ValidMoves.Count;
}
private static void GenerateValidMovesKingCastle(ChessBoard board, ChessPiece king)
{
if (king == null || king.Moved)
{
return;
}
if (king.PieceColor == ChessPieceColor.White &&
board.whiteCastled)
{
return;
}
if (king.PieceColor == ChessPieceColor.Black &&
board.blackCastled)
{
return;
}
if (king.PieceColor == ChessPieceColor.Black &&
board.blackInCheck)
{
return;
}
if (king.PieceColor == ChessPieceColor.White &&
board.whiteInCheck)
{
return;
}
//This code will add the castleling move to the pieces available moves
if (king.PieceColor == ChessPieceColor.White)
{
if (board.whiteInCheck)
{
return;
}
if (board.pieces[63] != null
&& board.pieces[63].Identifier == ChessPieceType.Rook
&& board.pieces[63].PieceColor == king.PieceColor
&& board.pieces[62] == null
&& board.pieces[61] == null
&& BlackAttackBoard[61] == false
&& BlackAttackBoard[62] == false)
{
//Ok looks like move is valid lets add it
king.ValidMoves.Push(62);
WhiteAttackBoard[62] = true;
}
if (board.pieces[56] != null
&& board.pieces[56].Identifier == ChessPieceType.Rook
&& board.pieces[56].PieceColor == king.PieceColor
&& board.pieces[57] == null
&& board.pieces[58] == null
&& board.pieces[59] == null
&& BlackAttackBoard[58] == false
&& BlackAttackBoard[59] == false)
{
//Ok looks like move is valid lets add it
king.ValidMoves.Push(58);
WhiteAttackBoard[58] = true;
}
}
else if (king.PieceColor == ChessPieceColor.Black)
{
if (board.blackInCheck)
{
return;
}
//There are two ways to castle, scenario 1:
if (board.pieces[7] != null)
{
//Check if the Right Rook is still in the correct position
if (board.pieces[7].Identifier == ChessPieceType.Rook
&& !board.pieces[7].Moved)
{
if (board.pieces[7].PieceColor == king.PieceColor)
{
//Move one column to right see if its empty
if (board.pieces[6] == null)
{
if (board.pieces[5] == null)
{
if (WhiteAttackBoard[5] == false && WhiteAttackBoard[6] == false)
{
//Ok looks like move is valid lets add it
king.ValidMoves.Push(6);
BlackAttackBoard[6] = true;
}
}
}
}
}
}
//There are two ways to castle, scenario 2:
if (board.pieces[0] != null)
{
//Check if the Left Rook is still in the correct position
if (board.pieces[0].Identifier == ChessPieceType.Rook &&
!board.pieces[0].Moved)
{
if (board.pieces[0].PieceColor ==
king.PieceColor)
{
//Move one column to right see if its empty
if (board.pieces[1] == null)
{
if (board.pieces[2] == null)
{
if (board.pieces[3] == null)
{
if (WhiteAttackBoard[2] == false &&
WhiteAttackBoard[3] == false)
{
//Ok looks like move is valid lets add it
king.ValidMoves.Push(2);
BlackAttackBoard[2] = true;
}
}
}
}
}
}
}
}
}
private static void GenerateValidMovesKing(ChessPiece piece, ChessBoard board, byte srcPosition)
{
if (piece == null)
{
return;
}
byte length = MoveArrays.KingTotalMoves[srcPosition];
for (byte i = 0; i < length; ++i)
{
byte dstPos = MoveArrays.KingMoves[srcPosition][i];
if (piece.PieceColor == ChessPieceColor.White)
{
//I can't move where I am being attacked
if (BlackAttackBoard[dstPos])
{
WhiteAttackBoard[dstPos] = true;
continue;
}
}
else if (WhiteAttackBoard[dstPos])
{
BlackAttackBoard[dstPos] = true;
continue;
}
AnalyzeMove(board, dstPos, piece);
}
}
private static void CheckValidMovesPawn(byte[] moves, ChessPiece pcMoving, byte srcPosition,
ChessBoard board, byte count)
{
for (byte i = 0; i < count; ++i)
{
byte dstPos = moves[i];
// Piece in capture position
if (dstPos % 8 != srcPosition % 8)
{
//If there is a piece there I can potentialy kill
AnalyzeMovePawn(board, dstPos, pcMoving);
if (pcMoving.PieceColor == ChessPieceColor.White)
{
WhiteAttackBoard[dstPos] = true;
}
else
{
BlackAttackBoard[dstPos] = true;
}
}
// if there is something in front pawns can't move there
else if (board.pieces[dstPos] != null)
{
return;
}
//if there is nothing in front of me (blocked == false)
else
{
pcMoving.ValidMoves.Push(dstPos);
}
}
}
private static void AnalyzeMovePawn(ChessBoard board, byte dstPos, ChessPiece movingPiece)
{
bool movingPieceIsWhite = movingPiece.PieceColor == ChessPieceColor.White;
//Because Pawns only kill diagonaly we handle the En Passant scenario specialy
if (board.EnPassantPosition == dstPos && board.EnPassantPosition > 0 && movingPiece.PieceColor != board.EnPassantColor)
{
//We have an En Passant Possible
movingPiece.ValidMoves.Push(dstPos);
if (movingPieceIsWhite)
{
WhiteAttackBoard[dstPos] = true;
}
else
{
BlackAttackBoard[dstPos] = true;
}
}
ChessPiece pcAttacked = board.pieces[dstPos];
//If there no piece there I can potentialy kill
if (pcAttacked == null)
return;
//Regardless of what is there I am attacking this square
if (movingPieceIsWhite)
{
WhiteAttackBoard[dstPos] = true;
//if that piece is the same color
if (pcAttacked.PieceColor == movingPiece.PieceColor)
{
pcAttacked.DefendedValue += movingPiece.PieceActionValue;
return;
}
pcAttacked.AttackedValue += movingPiece.PieceActionValue;
//If this is a king set it in check
if (pcAttacked.Identifier == ChessPieceType.King)
{
board.blackInCheck = true;
}
else
{
//Add this as a valid move
movingPiece.ValidMoves.Push(dstPos);
}
}
else
{
BlackAttackBoard[dstPos] = true;
//if that piece is the same color
if (pcAttacked.PieceColor == movingPiece.PieceColor)
{
pcAttacked.DefendedValue += movingPiece.PieceActionValue;
return;
}
pcAttacked.AttackedValue += movingPiece.PieceActionValue;
//If this is a king set it in check
if (pcAttacked.Identifier == ChessPieceType.King)
{
board.whiteInCheck = true;
}
else
{
//Add this as a valid move
movingPiece.ValidMoves.Push(dstPos);
}
}
return;
}
private static bool AnalyzeMove(ChessBoard board, byte dstPos, ChessPiece movingPiece)
{
//If I am not a pawn everywhere I move I can attack
bool movingPieceIsWhite = movingPiece.PieceColor == ChessPieceColor.White;
if (movingPieceIsWhite)
{
WhiteAttackBoard[dstPos] = true;
}
else
{
BlackAttackBoard[dstPos] = true;
}
ChessPiece pcAttacked = board.pieces[dstPos];
//If there no piece there I can potentialy kill just add the move and exit
if (pcAttacked == null)
{
movingPiece.ValidMoves.Push(dstPos);
return true;
}
if (pcAttacked.PieceColor != movingPiece.PieceColor)
{
// Different color I am attacking
pcAttacked.AttackedValue += movingPiece.PieceActionValue;
//If this is a king set it in check
if (pcAttacked.Identifier == ChessPieceType.King)
{
if (movingPieceIsWhite)
{
board.blackInCheck = true;
}
else
{
board.whiteInCheck = true;
}
}
else
{
//Add this as a valid move
movingPiece.ValidMoves.Push(dstPos);
}
//We don't continue movement past this piece
return false;
}
else
{
//Same Color I am defending
pcAttacked.DefendedValue += movingPiece.PieceActionValue;
//Since this piece is of my kind I can't move there
return false;
}
}
/// <summary>
/// This is called when the game should draw itself.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
spriteBatch.Begin();
//Draw Squares and Pieces
Color squareColor = Color.White;
for (byte i = 0; i < boardInfo.pieces.Length; ++i)
{
if ((int)(i / Constants.NumberOfRanks) % 2 == 0)
{
if (i % 2 == 0)
{
squareColor = Color.White;
}
else
{
squareColor = Color.Gray;
}
}
else
{
if (i % 2 == 0)
{
squareColor = Color.Gray;
}
else
{
squareColor = Color.White;
}
}
ChessPiece piece = boardInfo.pieces[i];
if (piece != null)
{
if (i == selectedIndex)
{
squareColor = Color.Blue;
}
spriteBatch.Draw(dummyTexture, new Rectangle((i % Constants.NumberOfFiles) * Constants.SquareSize, (int)(i / Constants.NumberOfRanks) * Constants.SquareSize, Constants.SquareSize, Constants.SquareSize), squareColor);
Texture2D textureToDraw;
if (piece.PieceColor == ChessPieceColor.White)
{
textureToDraw = textureArray[(int)piece.Identifier];
}
else
{
textureToDraw = textureArray[(int)ChessPieceType.None + (int)piece.Identifier];
}
spriteBatch.Draw(textureToDraw, new Rectangle((i % Constants.NumberOfFiles) * Constants.SquareSize, (int)(i / Constants.NumberOfRanks) * Constants.SquareSize, Constants.SquareSize, Constants.SquareSize), Color.White);
}
else
{
spriteBatch.Draw(dummyTexture, new Rectangle((i % Constants.NumberOfFiles) * Constants.SquareSize, (int)(i / Constants.NumberOfRanks) * Constants.SquareSize, Constants.SquareSize, Constants.SquareSize), squareColor);
}
}
if (boardInfo.whiteInCheck)
{
spriteBatch.Draw(whiteCheckTexture, new Vector2(540, 200), Color.White);
}
else if (boardInfo.blackInCheck)
{
spriteBatch.Draw(blackCheckTexture, new Vector2(540, 200), Color.White);
}
spriteBatch.Draw(undoTexture, undoRectangle, Color.White);
spriteBatch.End();
base.Draw(gameTime);
}