//Moves chess piece from old to new location on the board
public void movePiece(int oldCol, int oldRow, int newCol, int newRow)
{
//Finds the type and colour of piece that we're moving
chessPieces selectedType = chessBoard[oldCol, oldRow].Type();
chessColour selectedColour = chessBoard[oldCol, oldRow].Colour;
//You can't move a piece if it doesn't exist
if (selectedType != chessPieces.CLEAR)
{
//Variables to update display after enPassent move
bool enPassant = false;
Pawn enPassantPawn = null;
if (ChessPiece.DblMovePawn != null && chessBoard[oldCol, oldRow].Type() == chessPieces.PAWN)
{
enPassant = ChessPiece.isEnPassant(oldCol, oldRow, newCol, newRow, chessBoard);
enPassantPawn = (Pawn)(ChessPiece.DblMovePawn).Clone();
}
//Variables to update display after castling move
bool castling = false;
if (chessBoard[oldCol, oldRow].CanCastle && chessBoard[newCol, newRow].CanCastle)
{
castling = ChessPiece.isCastling(chessBoard[oldCol, oldRow], chessBoard[newCol, newRow], chessBoard);
}
//move the piece
ChessPiece.Move(oldCol, oldRow, newCol, newRow, chessBoard);
selectedType = chessBoard[newCol, newRow].Type(); //type may have changed (pawn->queen), so update
//Every time a valid move is made, switch turns
currentGame.changeTurns();
//DISPLAY - Special case: If we are castling, just update the whole row that the king is on
if (castling)
{
for (int i = 0; i < MAX_CHESS_SQUARES; i++)
{
displayPieceAt(i, newRow, chessBoard[i, newRow].Type(), chessBoard[i, newRow].Colour);
updateSelectionSquare();
}
}
else
{
//DISPLAY - Regular Move: Update only the piece that just moved:
displayPieceAt(newCol, newRow, selectedType, selectedColour);
//DISPLAY - Special case: If the move was enPassent, update the possible pawn locations (+/- one from the pawn that just moved
if (enPassant)
{
displayPieceAt(enPassantPawn.PositionX,
enPassantPawn.PositionY,
chessBoard[enPassantPawn.PositionX, enPassantPawn.PositionY].Type(),
chessBoard[enPassantPawn.PositionX, enPassantPawn.PositionY].Colour);
}
}
}
}