예제 #1
0
	/** main follower routine. Fills all members and return true on success.
	 *  Otherwise returns false if track can't be followed. */
	inline bool Follow(TileIndex old_tile, Trackdir old_td)
	{
		m_old_tile = old_tile;
		m_old_td = old_td;
		m_err = EC_NONE;
		assert(((TrackStatusToTrackdirBits(GetTileTrackStatus(m_old_tile, TT(), IsRoadTT() && m_veh != NULL ? RoadVehicle::From(m_veh)->compatible_roadtypes : 0)) & TrackdirToTrackdirBits(m_old_td)) != 0) ||
		       (IsTram() && GetSingleTramBit(m_old_tile) != INVALID_DIAGDIR)); // Disable the assertion for single tram bits
		m_exitdir = TrackdirToExitdir(m_old_td);
		if (ForcedReverse()) return true;
		if (!CanExitOldTile()) return false;
		FollowTileExit();
		if (!QueryNewTileTrackStatus()) return TryReverse();
		if (!CanEnterNewTile()) return false;
		m_new_td_bits &= DiagdirReachesTrackdirs(m_exitdir);
		if (m_new_td_bits == TRACKDIR_BIT_NONE) {
			m_err = EC_NO_WAY;
			return false;
		}
		if (!Allow90degTurns()) {
			m_new_td_bits &= (TrackdirBits)~(int)TrackdirCrossesTrackdirs(m_old_td);
			if (m_new_td_bits == TRACKDIR_BIT_NONE) {
				m_err = EC_90DEG;
				return false;
			}
		}
		return true;
	}
예제 #2
0
	/**
	 * main follower routine. Fills all members and return true on success.
	 *  Otherwise returns false if track can't be followed.
	 */
	inline bool Follow(TileIndex old_tile, Trackdir old_td)
	{
		m_old_tile = old_tile;
		m_old_td = old_td;
		m_err = EC_NONE;
		assert(
			((TrackStatusToTrackdirBits(
				GetTileTrackStatus(m_old_tile, TT(), (IsRoadTT() && m_veh != NULL) ? RoadVehicle::From(m_veh)->compatible_roadtypes : 0)
			) & TrackdirToTrackdirBits(m_old_td)) != 0) ||
			(IsTram() && GetSingleTramBit(m_old_tile) != INVALID_DIAGDIR) // Disable the assertion for single tram bits
		);
		m_exitdir = TrackdirToExitdir(m_old_td);
		if (ForcedReverse()) return true;
		if (!CanExitOldTile()) return false;
		FollowTileExit();
		if (!QueryNewTileTrackStatus()) return TryReverse();
		m_new_td_bits &= DiagdirReachesTrackdirs(m_exitdir);
		if (m_new_td_bits == TRACKDIR_BIT_NONE || !CanEnterNewTile()) {
			/* In case we can't enter the next tile, but are
			 * a normal road vehicle, then we can actually
			 * try to reverse as this is the end of the road.
			 * Trams can only turn on the appropriate bits in
			 * which case reaching this would mean a dead end
			 * near a building and in that case there would
			 * a "false" QueryNewTileTrackStatus result and
			 * as such reversing is already tried. The fact
			 * that function failed can have to do with a
			 * missing road bit, or inability to connect the
			 * different bits due to slopes. */
			if (IsRoadTT() && !IsTram() && TryReverse()) return true;

			/* CanEnterNewTile already set a reason.
			 * Do NOT overwrite it (important for example for EC_RAIL_TYPE).
			 * Only set a reason if CanEnterNewTile was not called */
			if (m_new_td_bits == TRACKDIR_BIT_NONE) m_err = EC_NO_WAY;

			return false;
		}
		if (!Allow90degTurns()) {
			m_new_td_bits &= (TrackdirBits)~(int)TrackdirCrossesTrackdirs(m_old_td);
			if (m_new_td_bits == TRACKDIR_BIT_NONE) {
				m_err = EC_90DEG;
				return false;
			}
		}
		return true;
	}