// duplicated code?
//public static bool IsDiagonal(int p1, int p2)
//{
// var diff = Math.Abs(p1 - p2);
// var ltr = diff % 9 == 0;
// var rtl = diff % 7 == 0;
// if (!ltr && !rtl)
// {
// return false;
// }
// return true;
//}
public static bool IsOrthogonal(int p1, int p2)
{
var rank = GetEntireRank(NotationEngine.PositionToRankInt(p1));
var file = GetEntireFile(p1);
return(rank.Contains(p2) || file.Contains(p2));
}
public static (int RookPos, int NewRookPos) GetRookPositionsForCastle(Color color, int piecePosition, int newPiecePosition)
{
//manage the castle
var rookRank = color == Color.White ? 1 : 8; //intentionally not zero based
var rookFile = NotationEngine.IntToFile(piecePosition - newPiecePosition > 0 ? 0 : 7);
var rookPos = NotationEngine.CoordinateToPosition(string.Concat(rookFile, rookRank.ToString()));
var newRookFile = NotationEngine.IntToFile(piecePosition - newPiecePosition > 0 ? 3 : 5);
var newRookPos = NotationEngine.CoordinateToPosition(string.Concat(newRookFile, rookRank.ToString()));
return(rookPos, newRookPos);
}