static public bool MoveNext(this iBoard b, ref MoveType lastMove)
{
while (lastMove < MoveType.Stop)
{
lastMove = lastMove + 1;
switch (lastMove)
{
case MoveType.Left:
case MoveType.Up:
case MoveType.Right:
case MoveType.Down:
if (b.Move(lastMove))
{
return(true);
}
break;
}
}
if (b.Steps.Any())
{
UndoStep last = b.PeekStep();
lastMove = last._type;
b.UndoMove();
return(b.MoveNext(ref lastMove));
}
else
{
return(false);
}
}
static public void Solve(this iBoard b, Func <bool> canceler)
{
MoveType lastMove = MoveType.Start;
while (!canceler() && !b.IsSolved() && b.MoveNext(ref lastMove))
{
lastMove = b.IsInDeadLock() ? MoveType.Stop : MoveType.Start;
Thread.Sleep(1000);
}
}