// If the position is not valid (verified in the previous method - PositionIsValid),
// it will launch an exception message.
public void ValidatePositionException(PositionBoard position)
{
if (!PositionIsValid(position))
{
throw new BoardException("Invalid Position!");
}
}
// We have a board that is 8 by 8, so we cannot allow the position of the pieces to be outside these limits.
// In this case, the line cannot be less than zero or greater than or equal to the value stipulated in the variable "lines", in this case 8.
// The same in the case of the columns.
// Tests whether the position is valid or not.
public bool PositionIsValid(PositionBoard position)
{
if (position.Row < 0 || position.Row >= Rows || position.Column < 0 || position.Column >= Columns)
{
return(false);
}
return(true);
}
// Checks whether a piece exists in a given position
public bool ThereIsAPiece(PositionBoard position)
{
// If there is a position validation error, the error message is displayed
ValidatePositionException(position);
// If this is true, there is a piece in this position
return(Piece(position) != null);
}
// Places a piece "piece" in the position "position"(has row and column from PositionBoard).
public void PlacePieceOnBoard(Piece piece, PositionBoard position)
{
// If method "ThereIsAPiece" returns true, then an error message is displayed.
// In this case that a piece already exists in that position
if (ThereIsAPiece(position))
{
throw new BoardException("There is already a piece in that position!");
}
// Places the piece in the matrix
pieces[position.Row, position.Column] = piece;
// The position of the piece is now "position"
piece.PositionBoard = position;
}
public Piece RemovePiece(PositionBoard position)
{
// There is no piece in this position to be removed.
if (Piece(position) == null)
{
return(null);
}
// If the previous "if" passed then there is a piece in that position.
Piece pieceToRemove = Piece(position);
// Now the position of that piece will cease to exist, it was removed from the board.
pieceToRemove.PositionBoard = null;
// The position on the board is null.
pieces[position.Row, position.Column] = null;
return(pieceToRemove);
}
public bool CanMoveTo(PositionBoard position)
{
return(PossibleMoviments()[position.Row, position.Column]);
}
public Piece Piece(PositionBoard position)
{
return(pieces[position.Row, position.Column]);
}
