# yapf_destrail.hpp

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    00001 /* $Id: yapf_destrail.hpp 23640 2011-12-20 17:57:56Z truebrain $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00012 #ifndef YAPF_DESTRAIL_HPP
    00013 #define YAPF_DESTRAIL_HPP
    00014
    00015 class CYapfDestinationRailBase
    00016 {
    00017 protected:
    00018   RailTypes m_compatible_railtypes;
    00019
    00020 public:
    00021   void SetDestination(const Train *v, bool override_rail_type = false)
    00022   {
    00023     m_compatible_railtypes = v->compatible_railtypes;
    00024     if (override_rail_type) m_compatible_railtypes |= GetRailTypeInfo(v->railtype)->compatible_railtypes;
    00025   }
    00026
    00027   bool IsCompatibleRailType(RailType rt)
    00028   {
    00029     return HasBit(m_compatible_railtypes, rt);
    00030   }
    00031
    00032   RailTypes GetCompatibleRailTypes() const
    00033   {
    00034     return m_compatible_railtypes;
    00035   }
    00036 };
    00037
    00038 template <class Types>
    00039 class CYapfDestinationAnyDepotRailT
    00040   : public CYapfDestinationRailBase
    00041 {
    00042 public:
    00043   typedef typename Types::Tpf Tpf;
    00044   typedef typename Types::NodeList::Titem Node;
    00045   typedef typename Node::Key Key;
    00046
    00048   Tpf& Yapf()
    00049   {
    00050     return *static_cast<Tpf*>(this);
    00051   }
    00052
    00054   inline bool PfDetectDestination(Node& n)
    00055   {
    00056     return PfDetectDestination(n.GetLastTile(), n.GetLastTrackdir());
    00057   }
    00058
    00060   inline bool PfDetectDestination(TileIndex tile, Trackdir td)
    00061   {
    00062     bool bDest = IsRailDepotTile(tile);
    00063     return bDest;
    00064   }
    00065
    00070   inline bool PfCalcEstimate(Node& n)
    00071   {
    00072     n.m_estimate = n.m_cost;
    00073     return true;
    00074   }
    00075 };
    00076
    00077 template <class Types>
    00078 class CYapfDestinationAnySafeTileRailT
    00079   : public CYapfDestinationRailBase
    00080 {
    00081 public:
    00082   typedef typename Types::Tpf Tpf;
    00083   typedef typename Types::NodeList::Titem Node;
    00084   typedef typename Node::Key Key;
    00085   typedef typename Types::TrackFollower TrackFollower;
    00086
    00088   Tpf& Yapf()
    00089   {
    00090     return *static_cast<Tpf*>(this);
    00091   }
    00092
    00094   inline bool PfDetectDestination(Node& n)
    00095   {
    00096     return PfDetectDestination(n.GetLastTile(), n.GetLastTrackdir());
    00097   }
    00098
    00100   inline bool PfDetectDestination(TileIndex tile, Trackdir td)
    00101   {
    00102     return IsSafeWaitingPosition(Yapf().GetVehicle(), tile, td, true, !TrackFollower::Allow90degTurns()) &&
    00103         IsWaitingPositionFree(Yapf().GetVehicle(), tile, td, !TrackFollower::Allow90degTurns());
    00104   }
    00105
    00110   inline bool PfCalcEstimate(Node& n)
    00111   {
    00112     n.m_estimate = n.m_cost;
    00113     return true;
    00114   }
    00115 };
    00116
    00117 template <class Types>
    00118 class CYapfDestinationTileOrStationRailT
    00119   : public CYapfDestinationRailBase
    00120 {
    00121 public:
    00122   typedef typename Types::Tpf Tpf;
    00123   typedef typename Types::NodeList::Titem Node;
    00124   typedef typename Node::Key Key;
    00125
    00126 protected:
    00127   TileIndex    m_destTile;
    00128   TrackdirBits m_destTrackdirs;
    00129   StationID    m_dest_station_id;
    00130
    00132   Tpf& Yapf()
    00133   {
    00134     return *static_cast<Tpf*>(this);
    00135   }
    00136
    00137 public:
    00138   void SetDestination(const Train *v)
    00139   {
    00140     switch (v->current_order.GetType()) {
    00141       case OT_GOTO_WAYPOINT:
    00142         if (!Waypoint::Get(v->current_order.GetDestination())->IsSingleTile()) {
    00143           /* In case of 'complex' waypoints we need to do a look
    00144            * ahead. This look ahead messes a bit about, which
    00145            * means that it 'corrupts' the cache. To prevent this
    00146            * we disable caching when we're looking for a complex
    00147            * waypoint. */
    00148           Yapf().DisableCache(true);
    00149         }
    00150         /* FALL THROUGH */
    00151       case OT_GOTO_STATION:
    00152         m_destTile = CalcClosestStationTile(v->current_order.GetDestination(), v->tile, v->current_order.IsType(OT_GOTO_STATION) ? STATION_RAIL : STATION_WAYPOINT);
    00153         m_dest_station_id = v->current_order.GetDestination();
    00154         m_destTrackdirs = INVALID_TRACKDIR_BIT;
    00155         break;
    00156
    00157       default:
    00158         m_destTile = v->dest_tile;
    00159         m_dest_station_id = INVALID_STATION;
    00160         m_destTrackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(v->dest_tile, TRANSPORT_RAIL, 0));
    00161         break;
    00162     }
    00163     CYapfDestinationRailBase::SetDestination(v);
    00164   }
    00165
    00167   inline bool PfDetectDestination(Node& n)
    00168   {
    00169     return PfDetectDestination(n.GetLastTile(), n.GetLastTrackdir());
    00170   }
    00171
    00173   inline bool PfDetectDestination(TileIndex tile, Trackdir td)
    00174   {
    00175     bool bDest;
    00176     if (m_dest_station_id != INVALID_STATION) {
    00177       bDest = HasStationTileRail(tile)
    00178         && (GetStationIndex(tile) == m_dest_station_id)
    00179         && (GetRailStationTrack(tile) == TrackdirToTrack(td));
    00180     } else {
    00181       bDest = (tile == m_destTile)
    00182         && ((m_destTrackdirs & TrackdirToTrackdirBits(td)) != TRACKDIR_BIT_NONE);
    00183     }
    00184     return bDest;
    00185   }
    00186
    00191   inline bool PfCalcEstimate(Node& n)
    00192   {
    00193     static const int dg_dir_to_x_offs[] = {-1, 0, 1, 0};
    00194     static const int dg_dir_to_y_offs[] = {0, 1, 0, -1};
    00195     if (PfDetectDestination(n)) {
    00196       n.m_estimate = n.m_cost;
    00197       return true;
    00198     }
    00199
    00200     TileIndex tile = n.GetLastTile();
    00201     DiagDirection exitdir = TrackdirToExitdir(n.GetLastTrackdir());
    00202     int x1 = 2 * TileX(tile) + dg_dir_to_x_offs[(int)exitdir];
    00203     int y1 = 2 * TileY(tile) + dg_dir_to_y_offs[(int)exitdir];
    00204     int x2 = 2 * TileX(m_destTile);
    00205     int y2 = 2 * TileY(m_destTile);
    00206     int dx = abs(x1 - x2);
    00207     int dy = abs(y1 - y2);
    00208     int dmin = min(dx, dy);
    00209     int dxy = abs(dx - dy);
    00210     int d = dmin * YAPF_TILE_CORNER_LENGTH + (dxy - 1) * (YAPF_TILE_LENGTH / 2);
    00211     n.m_estimate = n.m_cost + d;
    00212     assert(n.m_estimate >= n.m_parent->m_estimate);
    00213     return true;
    00214   }
    00215 };
    00216
    00217 #endif /* YAPF_DESTRAIL_HPP */