public override bool IsLegalMove(Square origin, Square destination)
{
if (origin.Color == destination.Color) return false;
if (origin.AlongFileOrRank(destination)) return true;
return origin.DiagonallyTo(destination);
}
// TODO: Refactoroi
private IList<Square> GetPositionsBetween(Square origin, Square destination)
{
var positionsBetweenToReturn = new List<Square>();
if (origin.AlongFile(destination))
{
for (int file = origin.File; file < destination.File; file++)
positionsBetweenToReturn.Add(Board.GetSquare(file, origin.Rank));
for (int file = origin.File; file > destination.File; file--)
positionsBetweenToReturn.Add(Board.GetSquare(file, origin.Rank));
}
else if (origin.AlongRank(destination))
{
for (int rank = origin.Rank; rank < destination.Rank; rank++)
positionsBetweenToReturn.Add(Board.GetSquare(origin.File, rank));
for (int rank = origin.Rank; rank > destination.Rank; rank--)
positionsBetweenToReturn.Add(Board.GetSquare(origin.File, rank));
}
else if (origin.DiagonallyTo(destination))
{
var startingFile = origin.File;
var startingRank = origin.Rank;
if (origin.File < destination.File
&& origin.Rank > destination.Rank)
{
while (startingFile <= destination.File && startingRank <= destination.File)
{
positionsBetweenToReturn.Add(Board.GetSquare(startingFile, startingRank));
startingFile += 1;
startingRank -= 1;
}
}
else if (origin.File > destination.File
&& origin.Rank < destination.Rank)
{
while (startingFile >= destination.File && startingRank <= destination.Rank)
{
positionsBetweenToReturn.Add(Board.GetSquare(startingFile, startingRank));
startingFile -= 1;
startingRank += 1;
}
}
else if (origin.File < destination.File
&& origin.Rank < destination.Rank)
{
while (startingFile <= destination.File && startingRank <= destination.Rank)
{
positionsBetweenToReturn.Add(Board.GetSquare(startingFile, startingRank));
startingFile += 1;
startingRank += 1;
}
}
else if (origin.File > destination.File
&& origin.Rank > destination.Rank)
{
while (startingFile >= destination.File && startingRank >= destination.Rank)
{
positionsBetweenToReturn.Add(Board.GetSquare(startingFile, startingRank));
startingFile -= 1;
startingRank -= 1;
}
}
}
positionsBetweenToReturn.Remove(origin);
positionsBetweenToReturn.Remove(destination);
return positionsBetweenToReturn;
}
public override bool IsLegalMove(Square origin, Square destination)
{
if (origin.Color == destination.Color) return false;
return (origin.DiagonallyTo(destination) && PathIsFree(origin, destination));
}