private static void TryAddSquare(List <SquareCoordinate> ret,
SquareCoordinate startingSquare,
int newRank,
int newFile,
Board board,
Color pieceColor,
SquareInfluenceType availabilityType)
{
if (!IsValidPosition(newRank, newFile))
{
return;
}
var newSquare = new SquareCoordinate(newRank, newFile);
switch (availabilityType)
{
case SquareInfluenceType.Control:
ret.Add(newSquare);
break;
case SquareInfluenceType.Mobility:
if (IsInPieceMobility(board, startingSquare, newSquare, pieceColor))
{
ret.Add(newSquare);
}
break;
default:
throw new NotImplementedException();
}
}
private static bool TryAddPieceGetIsLast(List <SquareCoordinate> ret,
SquareCoordinate startingSquare,
int newRank,
int newFile,
Board board,
Color pieceColor,
SquareInfluenceType availabilityType)
{
if (!IsValidPosition(newRank, newFile))
{
return(true);
}
TryAddSquare(ret, startingSquare, newRank, newFile, board, pieceColor, availabilityType);
return(board.IsAnyPieceInSquare(new SquareCoordinate(newRank, newFile)));
}
internal static IEnumerable <SquareCoordinate> GetPawnAvailability(SquareCoordinate startingCoordinate, Board board, Color pieceColor, SquareInfluenceType availabilityType)
{
switch (availabilityType)
{
case SquareInfluenceType.Control:
return(GetPawnControl(startingCoordinate, board, pieceColor));
case SquareInfluenceType.Mobility:
return(GetPawnMobility(startingCoordinate, board, pieceColor));
default:
throw new NotImplementedException();
}
}
internal static IEnumerable <SquareCoordinate> GetKnightAvailability(SquareCoordinate startingCoordinate, Board board, Color pieceColor, SquareInfluenceType availabilityType)
{
var ret = new List <SquareCoordinate>();
//Upper right, up
var rank = startingCoordinate.Rank + 2;
var file = startingCoordinate.File + 1;
TryAddSquare(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType);
//Upper right, right
rank = startingCoordinate.Rank + 1;
file = startingCoordinate.File + 2;
TryAddSquare(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType);
//Upper left, up
rank = startingCoordinate.Rank + 2;
file = startingCoordinate.File - 1;
TryAddSquare(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType);
//Upper left, right
rank = startingCoordinate.Rank + 1;
file = startingCoordinate.File - 2;
TryAddSquare(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType);
//Bottom right, bottom
rank = startingCoordinate.Rank - 2;
file = startingCoordinate.File + 1;
TryAddSquare(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType);
//Bottom right, right
rank = startingCoordinate.Rank - 1;
file = startingCoordinate.File + 2;
TryAddSquare(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType);
//Bottom left, bottom
rank = startingCoordinate.Rank - 2;
file = startingCoordinate.File - 1;
TryAddSquare(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType);
//Bottom left, right
rank = startingCoordinate.Rank - 1;
file = startingCoordinate.File - 2;
TryAddSquare(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType);
return(ret);
}
internal static IEnumerable <SquareCoordinate> GetKingAvailability(King king, SquareCoordinate startingCoordinate, Board board, SquareInfluenceType availabilityType)
{
switch (availabilityType)
{
case SquareInfluenceType.Control:
return(GetKingControl(startingCoordinate));
case SquareInfluenceType.Mobility:
return(GetKingMobility(king, startingCoordinate, board));
default:
throw new NotImplementedException();
}
}
internal static IEnumerable <SquareCoordinate> GetLineAvailability(SquareCoordinate startingCoordinate, Board board, Color pieceColor, SquareInfluenceType availabilityType)
{
var ret = new List <SquareCoordinate>();
//Upper line
for (int i = 1; i < 8; i++)
{
var rank = startingCoordinate.Rank + i;
var file = startingCoordinate.File;
if (TryAddPieceGetIsLast(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType))
{
break;
}
}
//Bottom line
for (int i = 1; i < 8; i++)
{
var rank = startingCoordinate.Rank - i;
var file = startingCoordinate.File;
if (TryAddPieceGetIsLast(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType))
{
break;
}
}
//Right line
for (int i = 1; i < 8; i++)
{
var rank = startingCoordinate.Rank;
var file = startingCoordinate.File + i;
if (TryAddPieceGetIsLast(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType))
{
break;
}
}
//Left line
for (int i = 1; i < 8; i++)
{
var rank = startingCoordinate.Rank;
var file = startingCoordinate.File - i;
if (TryAddPieceGetIsLast(ret, startingCoordinate, rank, file, board, pieceColor, availabilityType))
{
break;
}
}
return(ret);
}
