private bool DiagonalMovementIsSatisfied(PieceMovement candidate)
{
int fileModifier = PositionComparer.FileDistance(candidate.To, candidate.From) < 0 ? -1 : 1;
int rankModifier = PositionComparer.RankDistance(candidate.To, candidate.From) < 0 ? -1 : 1;
int fileIdx = candidate.From.FileIndex + fileModifier;
int rankIdx = candidate.From.RankIndex + rankModifier;
Func <bool> fileHasNext = () => fileIdx > 0 ? fileIdx <candidate.To.FileIndex
: fileIdx> candidate.To.FileIndex;
Func <bool> rankHasNext = () => rankIdx > 0 ? rankIdx <candidate.To.RankIndex
: rankIdx> candidate.To.RankIndex;
while (fileHasNext() || rankHasNext())
{
Position pos = Position.Create(fileIdx, rankIdx);
if (!_board.GetSquare(pos.Id).IsEmpty)
{
return(true);
}
fileIdx += fileModifier;
rankIdx += rankModifier;
}
return(false);
}
public bool IsSatisfied(PieceMovement input)
{
if (PositionComparer.FileDistanceAbs(input.From, input.To) == 0)
{
int rankDistance = PositionComparer.RankDistance(input.From, input.To);
if (input.Piece.Color == PieceColor.White &&
rankDistance < 0 && rankDistance >= (input.Piece.HasMoved ? -1 : -2))
{
return(true);
}
if (input.Piece.Color == PieceColor.Black &&
rankDistance > 0 && rankDistance <= (input.Piece.HasMoved ? 1 : 2))
{
return(true);
}
}
else if (PositionComparer.FileDistanceAbs(input.From, input.To) == 1 &&
PositionComparer.RankDistanceAbs(input.From, input.To) == 1)
{
Square squareDestination = _board.GetSquare(input.To.Id);
if (!squareDestination.IsEmpty && squareDestination.Piece.Color != input.Piece.Color)
{
return(true);
}
}
return(false);
}