public void ChangePosition(Piece piece, ChessPoint newPosition)
{
if (ReferenceEquals(piece, null))
{
throw new ArgumentNullException(nameof(piece));
}
if (ReferenceEquals(newPosition, null))
{
throw new ArgumentNullException(nameof(newPosition));
}
var oldCoordinates = new MappedCoordinates(piece.Coordinate);
var newCoordinates = new MappedCoordinates(newPosition);
if (!ReferenceEquals(_map[newCoordinates.X][newCoordinates.Y], null))
{
throw new BusyCellException("Can't change piece position: the cell with coodinates " +
$"{newPosition.Letter}{newPosition.Number} ({newCoordinates.X}, {newCoordinates.Y}) is busy.");
}
_map[newCoordinates.X][newCoordinates.Y] = piece;
_map[oldCoordinates.X][oldCoordinates.Y] = null;
piece.Coordinate.Letter = newPosition.Letter;
piece.Coordinate.Number = newPosition.Number;
}
public MappedCoordinates(ChessPoint coordinate)
{
X = coordinate.Letter - 'a';
Y = coordinate.Number - 1;
}
public Piece GetPiece(ChessPoint cell)
{
var mapCoordinates = new MappedCoordinates(cell);
return(_map[mapCoordinates.X][mapCoordinates.Y]);
}