private bool canAdd(Tile toadd, List<Tile> open, List<Tile> closed)
{
bool ret = false;
if (DEBUG)
Console.WriteLine("entered canAdd");
if (toadd != null && !toadd.isObstacle() && !closed.Contains(toadd) && !open.Contains(toadd))
{
if(DEBUG)
Console.WriteLine("Can add (" + toadd.getMapX() + "," + toadd.getMapY() + ")");
ret = true;
}
if (DEBUG)
Console.WriteLine("exiting canAdd");
return ret;
}