public override void Apply(IMarkingsProvider markings, Path path)
{
var checkMarkers = markings.GetKingMarkers <CheckMarker>(path.Piece.Color).ToList();
base.Apply(checkMarkers.Any() ? new MarkingFilter(marker =>
{
if (!(marker is MoveMarker moveMarker) || path.Piece.Type == PieceType.King)
{
// + All King moves
return(true);
}
if (checkMarkers.Count > 1)
{
// + If multiple checks, must move king
return(false);
}
var move = moveMarker.Move;
var check = checkMarkers[0];
// + Take single checking piece
if (move.To == check.Source)
{
return(true);
}
// + If "None" must take piece or move king otherwise intercede
return(check.Direction != Direction.None && move.To.IsBetween(check.Source, check.KingLocation));
}, markings) : markings, path);
}
public override void Apply(IMarkingsProvider markings, Path path)
{
if (path.Piece.Type == PieceType.King && !path.AllowTake)
{
var(point, piece) = path.Squares.SkipWhile((tuple, i) => tuple.Item2.IsEmpty).FirstOrDefault();
if (!piece.HasMoved && piece.Type == PieceType.Rook && path.Piece.Color == piece.Color &&
!markings.GetKingMarkers <CheckMarker>(path.Piece.Color).Any())
{
markings.Mark(path.Start, new MoveMarker(new CastleMove(
new SimpleMove(path.Start, path.Start.PolarOffset(path.Direction, 2)),
new SimpleMove(point, path.Start.PolarOffset(path.Direction, 1))
), path.Direction));
}
return;
}
base.Apply(markings, path);
}
public IEnumerable <T> GetKingMarkers <T>(Color color, params MarkerType[] types) where T : IMarker => m_markings.GetKingMarkers <T>(color, types);