public static List <IChinesePiece> GetBetween(this IChinesePiece piece, IChinesePiece another, Chessboard chessboard)
{
var pos1 = chessboard.FindPos(piece);
var pos2 = chessboard.FindPos(another);
var list = new List <IChinesePiece>();
if (pos1.Valid() && pos2.Valid())
{
if (pos1 == pos2)
{
return(list);
}
if (pos1.X == pos2.X)
{
var x = pos1.X;
for (var i = (pos1.Y > pos2.Y ? pos2 : pos1).Y + 1; i < (pos1.Y > pos2.Y ? pos1 : pos2).Y; i++)
{
var currentPiece = chessboard.GetPiece(new Point(x, i));
if (currentPiece.NotEmptyPiece())
{
list.Add(currentPiece);
}
}
}
else if (pos1.Y == pos2.Y)
{
var y = pos1.Y;
for (var i = (pos1.X > pos2.X ? pos2 : pos1).X; i < (pos1.X > pos2.X ? pos1 : pos2).X; i++)
{
var currentPiece = chessboard.GetPiece(new Point(i, y));
if (currentPiece.NotEmptyPiece())
{
list.Add(currentPiece);
}
}
}
return(list);
}
throw new InvalidOperationException();
}