public IEnumerable <ChessMove> GetAvailableMoves(IReadOnlyChessPiece chessPiece)
{
var availableMoves = new List <ChessMove>();
if (chessPiece.PieceType != ChessPieceType.King)
{
return(availableMoves);
}
foreach (var position in GetNearestPositions(chessPiece.Position))
{
var isEnemyPresent = chessBoard.IsEnemyOnPosition(position, chessPiece.Color.Opposite());
if (isEnemyPresent)
{
availableMoves.Add(new ChessMove(chessPiece.Position, position));
continue;
}
var isPositionTaken = chessBoard.IsPositionTaken(position);
if (!isPositionTaken)
{
availableMoves.Add(new ChessMove(chessPiece.Position, position));
}
}
return(availableMoves);
}
private void AddNormalMoves(IReadOnlyChessPiece chessPiece, int yDirection,
List <ChessMove> availableMoves)
{
var possibleDestination = new Position(chessPiece.Position.X,
chessPiece.Position.Y + yDirection);
if (chessBoard.IsPositionTaken(possibleDestination))
{
return;
}
var chessMove = new ChessMove(chessPiece.Position, possibleDestination);
availableMoves.Add(chessMove);
AddDoubleMove(chessPiece, yDirection, availableMoves);
}
private bool ArePositionsEmpty(IReadOnlyChessPiece king)
{
int y = king.Position.Y;
for (int x = king.Position.X - 1; x > 0; x--)
{
if (chessBoard.IsPositionTaken(new Position(x, y)))
{
return(false);
}
}
return(true);
}
private bool ArePositionsEmpty(IReadOnlyChessPiece king)
{
int y = king.Position.Y;
for (int x = king.Position.X + 1; x < kingsideRookXPosition; x++)
{
if (chessBoard.IsPositionTaken(new Position(x, y)))
{
return(false);
}
}
return(true);
}
private bool AddPositionToList(IReadOnlyChessPiece chessPiece,
Position position, List <Position> positions)
{
var isEnemy = chessBoard
.IsEnemyOnPosition(position, chessPiece.Color.Opposite());
if (isEnemy)
{
positions.Add(position);
return(true);
}
if (chessBoard.IsPositionTaken(position))
{
return(true);
}
positions.Add(position);
return(false);
}
private List <Position> FilterTakenPositionsAndEnemies(List <Position> positions,
ChessColor chessColor)
{
var filtered = new List <Position>();
foreach (var position in positions)
{
var isEnemy = chessBoard
.IsEnemyOnPosition(position, chessColor.Opposite());
if (isEnemy)
{
filtered.Add(position);
continue;
}
if (!chessBoard.IsPositionTaken(position))
{
filtered.Add(position);
}
}
return(filtered);
}
