private void UndoMove(Position source, Position target, Piece capturedPiece)
{
ChessPiece p = (ChessPiece)Board.RemovePiece(target);
p.DecreaseMoveCount();
Board.PlacePiece(p, source);
if (capturedPiece != null)
{
Board.PlacePiece(capturedPiece, target);
CapturedPieces.Remove(capturedPiece);
PiecesOnTheBoard.Add(capturedPiece);
}
//SpecialMove Castling KingSide Rook
if (p is King && target.Column == source.Column + 2)
{
Position sourceRook = new Position(source.Row, source.Column + 3);
Position targetRook = new Position(source.Row, source.Column + 1);
ChessPiece rook = (ChessPiece)Board.RemovePiece(targetRook);
Board.PlacePiece(rook, sourceRook);
rook.DecreaseMoveCount();
}
//SpecialMove Castling QueenSide Rook
if (p is King && target.Column == source.Column - 2)
{
Position sourceRook = new Position(source.Row, source.Column - 4);
Position targetRook = new Position(source.Row, source.Column - 1);
ChessPiece rook = (ChessPiece)Board.RemovePiece(targetRook);
Board.PlacePiece(rook, sourceRook);
rook.DecreaseMoveCount();
}
//SpecialMove EnPassant
if (p is Pawn)
{
if (source.Column != target.Column && capturedPiece == EnPassantVulnerable)
{
ChessPiece pawn = (ChessPiece)Board.RemovePiece(target);
Position pawnPosition;
if (p.Color == Color.White)
{
pawnPosition = new Position(3, target.Column);
}
else
{
pawnPosition = new Position(3, target.Column);
}
Board.PlacePiece(pawn, pawnPosition);
}
}
}
public ChessPiece ReplacePromotedPiece(String type)
{
if (Promoted == null)
{
throw new ApplicationException("There is no piece to be promoted.\n");
}
if (!type.Equals("B") && !type.Equals("N") && !type.Equals("R") && !type.Equals("Q"))
{
return(Promoted);
}
Position promotedPosition = Promoted.GetChessPosition().ToPosition();
Piece promoted = Board.RemovePiece(promotedPosition);
PiecesOnTheBoard.Remove(promoted);
ChessPiece newPiece = NewPiece(type, Promoted.Color);
Board.PlacePiece(newPiece, promotedPosition);
PiecesOnTheBoard.Add(newPiece);
return(newPiece);
}
private void PlaceNewPiece(char column, int row, ChessPiece piece)
{
Board.PlacePiece(piece, new ChessPosition(column, row).ToPosition());
PiecesOnTheBoard.Add(piece);
}