public bool TileIsThreatened(ChessTile Position, ChessColor Color)
{
//Warning!
//This function is meant to be used for identifying checks, and does not detect "en passant"
List <(int, int)> RookDir = new List <(int, int)>()
{
(1, 0), (0, 1), (-1, 0), (0, -1)
};
List <(int, int)> BishopDir = new List <(int, int)> {
(1, 1), (-1, 1), (-1, -1), (1, -1)
};
List <(int, int)> KnightDir = new List <(int, int)> {
(2, 1), (2, -1), (-2, 1), (-2, -1), (1, 2), (1, -2), (-1, 2), (-1, -2)
};
//check rook
foreach ((int, int)dir in RookDir)
{
ChessTile pos = Position + dir;
while (pos.InBound())
{
if (this[pos] != null)
{
if (this[pos].Color != Color && (this[pos] is Rook || this[pos] is Queen))
{
return(true);
}
break;
}
pos += dir;
}
}
//check bishop
foreach ((int, int)dir in BishopDir)
{
ChessTile pos = Position + dir;
while (pos.InBound())
{
if (this[pos] != null)
{
if (this[pos].Color != Color && (this[pos] is Bishop || this[pos] is Queen))
{
return(true);
}
break;
}
pos += dir;
}
}
//check knight
foreach ((int, int)dir in KnightDir)
{
ChessTile pos = Position + dir;
if (pos.InBound())
{
if (this[pos] != null)
{
if (this[pos].Color != Color && this[pos] is Knight)
{
return(true);
}
}
}
}
//check king
foreach ((int, int)dir in RookDir.Concat(BishopDir))
{
ChessTile pos = Position + dir;
if (pos.InBound())
{
if (this[pos] != null)
{
if (this[pos].Color != Color && this[pos] is King)
{
return(true);
}
}
}
}
//check pawn
int PawnDir = Color == ChessColor.White ? 1 : -1;
List <int> PawnDiag = new List <int>()
{
1, -1
};
foreach (var diag in PawnDiag)
{
ChessTile pos = Position + (diag, PawnDir);
if (pos.InBound() && this[pos] != null && this[pos].Color != Color && this[pos] is Pawn)
{
return(true);
}
}
return(false);
}
