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/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file follow_track.hpp Template function for track followers */
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#ifndef FOLLOW_TRACK_HPP
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#define FOLLOW_TRACK_HPP
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#include "../pbs.h"
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#include "../roadveh.h"
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#include "../station_base.h"
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#include "../train.h"
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#include "../tunnelbridge.h"
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#include "../tunnelbridge_map.h"
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#include "../depot_map.h"
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#include "pf_performance_timer.hpp"
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/**
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* Track follower helper template class (can serve pathfinders and vehicle
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* controllers). See 6 different typedefs below for 3 different transport
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* types w/ or w/o 90-deg turns allowed
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*/
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template <TransportType Ttr_type_, typename VehicleType, bool T90deg_turns_allowed_ = true, bool Tmask_reserved_tracks = false>
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struct CFollowTrackT
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{
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enum ErrorCode {
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EC_NONE,
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EC_OWNER,
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EC_RAIL_TYPE,
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EC_90DEG,
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EC_NO_WAY,
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EC_RESERVED,
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};
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const VehicleType *m_veh; ///< moving vehicle
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Owner m_veh_owner; ///< owner of the vehicle
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TileIndex m_old_tile; ///< the origin (vehicle moved from) before move
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Trackdir m_old_td; ///< the trackdir (the vehicle was on) before move
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TileIndex m_new_tile; ///< the new tile (the vehicle has entered)
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TrackdirBits m_new_td_bits; ///< the new set of available trackdirs
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DiagDirection m_exitdir; ///< exit direction (leaving the old tile)
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bool m_is_tunnel; ///< last turn passed tunnel
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bool m_is_bridge; ///< last turn passed bridge ramp
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bool m_is_station; ///< last turn passed station
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int m_tiles_skipped; ///< number of skipped tunnel or station tiles
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ErrorCode m_err;
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CPerformanceTimer *m_pPerf;
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RailTypes m_railtypes;
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inline CFollowTrackT(const VehicleType *v = NULL, RailTypes railtype_override = INVALID_RAILTYPES, CPerformanceTimer *pPerf = NULL)
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{
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Init(v, railtype_override, pPerf);
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}
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inline CFollowTrackT(Owner o, RailTypes railtype_override = INVALID_RAILTYPES, CPerformanceTimer *pPerf = NULL)
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{
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m_veh = NULL;
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Init(o, railtype_override, pPerf);
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}
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inline void Init(const VehicleType *v, RailTypes railtype_override, CPerformanceTimer *pPerf)
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{
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assert(!IsRailTT() || (v != NULL && v->type == VEH_TRAIN));
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m_veh = v;
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Init(v != NULL ? v->owner : INVALID_OWNER, IsRailTT() && railtype_override == INVALID_RAILTYPES ? Train::From(v)->compatible_railtypes : railtype_override, pPerf);
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}
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inline void Init(Owner o, RailTypes railtype_override, CPerformanceTimer *pPerf)
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{
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assert((!IsRoadTT() || m_veh != NULL) && (!IsRailTT() || railtype_override != INVALID_RAILTYPES));
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m_veh_owner = o;
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m_pPerf = pPerf;
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/* don't worry, all is inlined so compiler should remove unnecessary initializations */
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m_new_tile = INVALID_TILE;
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m_new_td_bits = TRACKDIR_BIT_NONE;
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m_exitdir = INVALID_DIAGDIR;
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m_is_station = m_is_bridge = m_is_tunnel = false;
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m_tiles_skipped = 0;
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m_err = EC_NONE;
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m_railtypes = railtype_override;
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}
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inline static TransportType TT() {return Ttr_type_;}
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inline static bool IsWaterTT() {return TT() == TRANSPORT_WATER;}
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inline static bool IsRailTT() {return TT() == TRANSPORT_RAIL;}
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inline bool IsTram() {return IsRoadTT() && HasBit(RoadVehicle::From(m_veh)->compatible_roadtypes, ROADTYPE_TRAM);}
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inline static bool IsRoadTT() {return TT() == TRANSPORT_ROAD;}
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inline static bool Allow90degTurns() {return T90deg_turns_allowed_;}
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inline static bool DoTrackMasking() {return IsRailTT() && Tmask_reserved_tracks;}
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/** Tests if a tile is a road tile with a single tramtrack (tram can reverse) */
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inline DiagDirection GetSingleTramBit(TileIndex tile)
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{
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assert(IsTram()); // this function shouldn't be called in other cases
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if (IsNormalRoadTile(tile)) {
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RoadBits rb = GetRoadBits(tile, ROADTYPE_TRAM);
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switch (rb) {
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case ROAD_NW: return DIAGDIR_NW;
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case ROAD_SW: return DIAGDIR_SW;
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case ROAD_SE: return DIAGDIR_SE;
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case ROAD_NE: return DIAGDIR_NE;
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default: break;
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}
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}
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return INVALID_DIAGDIR;
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}
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/**
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* main follower routine. Fills all members and return true on success.
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* Otherwise returns false if track can't be followed.
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*/
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inline bool Follow(TileIndex old_tile, Trackdir old_td)
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{
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m_old_tile = old_tile;
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m_old_td = old_td;
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m_err = EC_NONE;
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assert(((TrackStatusToTrackdirBits(GetTileTrackStatus(m_old_tile, TT(), IsRoadTT() && m_veh != NULL ? RoadVehicle::From(m_veh)->compatible_roadtypes : 0)) & TrackdirToTrackdirBits(m_old_td)) != 0) ||
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(IsTram() && GetSingleTramBit(m_old_tile) != INVALID_DIAGDIR)); // Disable the assertion for single tram bits
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m_exitdir = TrackdirToExitdir(m_old_td);
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if (ForcedReverse()) return true;
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if (!CanExitOldTile()) return false;
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FollowTileExit();
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if (!QueryNewTileTrackStatus()) return TryReverse();
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if (!CanEnterNewTile()) return false;
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m_new_td_bits &= DiagdirReachesTrackdirs(m_exitdir);
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if (m_new_td_bits == TRACKDIR_BIT_NONE) {
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/* In case we can't enter the next tile, but are
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* a normal road vehicle, then we can actually
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* try to reverse as this is the end of the road.
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* Trams can only turn on the appropriate bits in
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* which case reaching this would mean a dead end
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* near a building and in that case there would
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* a "false" QueryNewTileTrackStatus result and
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* as such reversing is already tried. The fact
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* that function failed can have to do with a
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* missing road bit, or inability to connect the
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* different bits due to slopes. */
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if (IsRoadTT() && !IsTram() && TryReverse()) return true;
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m_err = EC_NO_WAY;
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return false;
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}
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if (!Allow90degTurns()) {
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m_new_td_bits &= (TrackdirBits)~(int)TrackdirCrossesTrackdirs(m_old_td);
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if (m_new_td_bits == TRACKDIR_BIT_NONE) {
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m_err = EC_90DEG;
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return false;
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}
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}
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return true;
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}
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inline bool MaskReservedTracks()
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{
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if (!DoTrackMasking()) return true;
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if (m_is_station) {
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/* Check skipped station tiles as well. */
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TileIndexDiff diff = TileOffsByDiagDir(m_exitdir);
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for (TileIndex tile = m_new_tile - diff * m_tiles_skipped; tile != m_new_tile; tile += diff) {
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if (HasStationReservation(tile)) {
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m_new_td_bits = TRACKDIR_BIT_NONE;
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m_err = EC_RESERVED;
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return false;
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}
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}
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}
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TrackBits reserved = GetReservedTrackbits(m_new_tile);
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/* Mask already reserved trackdirs. */
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m_new_td_bits &= ~TrackBitsToTrackdirBits(reserved);
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/* Mask out all trackdirs that conflict with the reservation. */
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Track t;
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FOR_EACH_SET_TRACK(t, TrackdirBitsToTrackBits(m_new_td_bits)) {
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if (TracksOverlap(reserved | TrackToTrackBits(t))) m_new_td_bits &= ~TrackToTrackdirBits(t);
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}
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if (m_new_td_bits == TRACKDIR_BIT_NONE) {
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m_err = EC_RESERVED;
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return false;
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}
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return true;
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}
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protected:
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/** Follow the m_exitdir from m_old_tile and fill m_new_tile and m_tiles_skipped */
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inline void FollowTileExit()
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{
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m_is_station = m_is_bridge = m_is_tunnel = false;
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m_tiles_skipped = 0;
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/* extra handling for tunnels and bridges in our direction */
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if (IsTileType(m_old_tile, MP_TUNNELBRIDGE)) {
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DiagDirection enterdir = GetTunnelBridgeDirection(m_old_tile);
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if (enterdir == m_exitdir) {
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/* we are entering the tunnel / bridge */
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if (IsTunnel(m_old_tile)) {
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m_is_tunnel = true;
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m_new_tile = GetOtherTunnelEnd(m_old_tile);
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} else { // IsBridge(m_old_tile)
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m_is_bridge = true;
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m_new_tile = GetOtherBridgeEnd(m_old_tile);
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}
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m_tiles_skipped = GetTunnelBridgeLength(m_new_tile, m_old_tile);
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return;
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}
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assert(ReverseDiagDir(enterdir) == m_exitdir);
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}
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/* normal or station tile, do one step */
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TileIndexDiff diff = TileOffsByDiagDir(m_exitdir);
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m_new_tile = TILE_ADD(m_old_tile, diff);
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/* special handling for stations */
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if (IsRailTT() && HasStationTileRail(m_new_tile)) {
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m_is_station = true;
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} else if (IsRoadTT() && IsRoadStopTile(m_new_tile)) {
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m_is_station = true;
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} else {
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m_is_station = false;
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}
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}
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/** stores track status (available trackdirs) for the new tile into m_new_td_bits */
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inline bool QueryNewTileTrackStatus()
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{
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CPerfStart perf(*m_pPerf);
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if (IsRailTT() && IsPlainRailTile(m_new_tile)) {
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m_new_td_bits = (TrackdirBits)(GetTrackBits(m_new_tile) * 0x101);
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} else {
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m_new_td_bits = TrackStatusToTrackdirBits(GetTileTrackStatus(m_new_tile, TT(), IsRoadTT() && m_veh != NULL ? RoadVehicle::From(m_veh)->compatible_roadtypes : 0));
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if (IsTram() && m_new_td_bits == 0) {
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/* GetTileTrackStatus() returns 0 for single tram bits.
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* As we cannot change it there (easily) without breaking something, change it here */
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switch (GetSingleTramBit(m_new_tile)) {
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case DIAGDIR_NE:
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case DIAGDIR_SW:
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m_new_td_bits = TRACKDIR_BIT_X_NE | TRACKDIR_BIT_X_SW;
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break;
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case DIAGDIR_NW:
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case DIAGDIR_SE:
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m_new_td_bits = TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_Y_SE;
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break;
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default: break;
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}
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}
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}
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return (m_new_td_bits != TRACKDIR_BIT_NONE);
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}
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/** return true if we can leave m_old_tile in m_exitdir */
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inline bool CanExitOldTile()
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{
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/* road stop can be left at one direction only unless it's a drive-through stop */
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if (IsRoadTT() && IsStandardRoadStopTile(m_old_tile)) {
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DiagDirection exitdir = GetRoadStopDir(m_old_tile);
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if (exitdir != m_exitdir) {
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m_err = EC_NO_WAY;
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return false;
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}
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}
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/* single tram bits can only be left in one direction */
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if (IsTram()) {
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DiagDirection single_tram = GetSingleTramBit(m_old_tile);
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if (single_tram != INVALID_DIAGDIR && single_tram != m_exitdir) {
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m_err = EC_NO_WAY;
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return false;
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}
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}
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/* road depots can be also left in one direction only */
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if (IsRoadTT() && IsDepotTypeTile(m_old_tile, TT())) {
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DiagDirection exitdir = GetRoadDepotDirection(m_old_tile);
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if (exitdir != m_exitdir) {
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m_err = EC_NO_WAY;
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return false;
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}
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}
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return true;
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}
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/** return true if we can enter m_new_tile from m_exitdir */
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inline bool CanEnterNewTile()
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{
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if (IsRoadTT() && IsStandardRoadStopTile(m_new_tile)) {
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/* road stop can be entered from one direction only unless it's a drive-through stop */
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DiagDirection exitdir = GetRoadStopDir(m_new_tile);
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if (ReverseDiagDir(exitdir) != m_exitdir) {
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m_err = EC_NO_WAY;
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return false;
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}
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}
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/* single tram bits can only be entered from one direction */
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if (IsTram()) {
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DiagDirection single_tram = GetSingleTramBit(m_new_tile);
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if (single_tram != INVALID_DIAGDIR && single_tram != ReverseDiagDir(m_exitdir)) {
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m_err = EC_NO_WAY;
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return false;
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}
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}
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/* road and rail depots can also be entered from one direction only */
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if (IsRoadTT() && IsDepotTypeTile(m_new_tile, TT())) {
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DiagDirection exitdir = GetRoadDepotDirection(m_new_tile);
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if (ReverseDiagDir(exitdir) != m_exitdir) {
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m_err = EC_NO_WAY;
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return false;
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}
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/* don't try to enter other company's depots */
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if (GetTileOwner(m_new_tile) != m_veh_owner) {
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m_err = EC_OWNER;
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return false;
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}
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}
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if (IsRailTT() && IsDepotTypeTile(m_new_tile, TT())) {
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DiagDirection exitdir = GetRailDepotDirection(m_new_tile);
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if (ReverseDiagDir(exitdir) != m_exitdir) {
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m_err = EC_NO_WAY;
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return false;
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}
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}
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/* rail transport is possible only on tiles with the same owner as vehicle */
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if (IsRailTT() && GetTileOwner(m_new_tile) != m_veh_owner) {
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/* different owner */
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m_err = EC_NO_WAY;
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return false;
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|
}
|
|
|
|
|
|
|
|
/* rail transport is possible only on compatible rail types */
|
|
|
|
if (IsRailTT()) {
|
|
|
|
RailType rail_type = GetTileRailType(m_new_tile);
|
|
|
|
if (!HasBit(m_railtypes, rail_type)) {
|
|
|
|
/* incompatible rail type */
|
|
|
|
m_err = EC_RAIL_TYPE;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* tunnel holes and bridge ramps can be entered only from proper direction */
|
|
|
|
if (IsTileType(m_new_tile, MP_TUNNELBRIDGE)) {
|
|
|
|
if (IsTunnel(m_new_tile)) {
|
|
|
|
if (!m_is_tunnel) {
|
|
|
|
DiagDirection tunnel_enterdir = GetTunnelBridgeDirection(m_new_tile);
|
|
|
|
if (tunnel_enterdir != m_exitdir) {
|
|
|
|
m_err = EC_NO_WAY;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else { // IsBridge(m_new_tile)
|
|
|
|
if (!m_is_bridge) {
|
|
|
|
DiagDirection ramp_enderdir = GetTunnelBridgeDirection(m_new_tile);
|
|
|
|
if (ramp_enderdir != m_exitdir) {
|
|
|
|
m_err = EC_NO_WAY;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* special handling for rail stations - get to the end of platform */
|
|
|
|
if (IsRailTT() && m_is_station) {
|
|
|
|
/* entered railway station
|
|
|
|
* get platform length */
|
|
|
|
uint length = BaseStation::GetByTile(m_new_tile)->GetPlatformLength(m_new_tile, TrackdirToExitdir(m_old_td));
|
|
|
|
/* how big step we must do to get to the last platform tile; */
|
|
|
|
m_tiles_skipped = length - 1;
|
|
|
|
/* move to the platform end */
|
|
|
|
TileIndexDiff diff = TileOffsByDiagDir(m_exitdir);
|
|
|
|
diff *= m_tiles_skipped;
|
|
|
|
m_new_tile = TILE_ADD(m_new_tile, diff);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/** return true if we must reverse (in depots and single tram bits) */
|
|
|
|
inline bool ForcedReverse()
|
|
|
|
{
|
|
|
|
/* rail and road depots cause reversing */
|
|
|
|
if (!IsWaterTT() && IsDepotTypeTile(m_old_tile, TT())) {
|
|
|
|
DiagDirection exitdir = IsRailTT() ? GetRailDepotDirection(m_old_tile) : GetRoadDepotDirection(m_old_tile);
|
|
|
|
if (exitdir != m_exitdir) {
|
|
|
|
/* reverse */
|
|
|
|
m_new_tile = m_old_tile;
|
|
|
|
m_new_td_bits = TrackdirToTrackdirBits(ReverseTrackdir(m_old_td));
|
|
|
|
m_exitdir = exitdir;
|
|
|
|
m_tiles_skipped = 0;
|
|
|
|
m_is_tunnel = m_is_bridge = m_is_station = false;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* single tram bits cause reversing */
|
|
|
|
if (IsTram() && GetSingleTramBit(m_old_tile) == ReverseDiagDir(m_exitdir)) {
|
|
|
|
/* reverse */
|
|
|
|
m_new_tile = m_old_tile;
|
|
|
|
m_new_td_bits = TrackdirToTrackdirBits(ReverseTrackdir(m_old_td));
|
|
|
|
m_exitdir = ReverseDiagDir(m_exitdir);
|
|
|
|
m_tiles_skipped = 0;
|
|
|
|
m_is_tunnel = m_is_bridge = m_is_station = false;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/** return true if we successfully reversed at end of road/track */
|
|
|
|
inline bool TryReverse()
|
|
|
|
{
|
|
|
|
if (IsRoadTT() && !IsTram()) {
|
|
|
|
/* if we reached the end of road, we can reverse the RV and continue moving */
|
|
|
|
m_exitdir = ReverseDiagDir(m_exitdir);
|
|
|
|
/* new tile will be the same as old one */
|
|
|
|
m_new_tile = m_old_tile;
|
|
|
|
/* set new trackdir bits to all reachable trackdirs */
|
|
|
|
QueryNewTileTrackStatus();
|
|
|
|
m_new_td_bits &= DiagdirReachesTrackdirs(m_exitdir);
|
|
|
|
if (m_new_td_bits != TRACKDIR_BIT_NONE) {
|
|
|
|
/* we have some trackdirs reachable after reversal */
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
m_err = EC_NO_WAY;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
public:
|
|
|
|
/** Helper for pathfinders - get min/max speed on the m_old_tile/m_old_td */
|
|
|
|
int GetSpeedLimit(int *pmin_speed = NULL) const
|
|
|
|
{
|
|
|
|
int min_speed = 0;
|
|
|
|
int max_speed = INT_MAX; // no limit
|
|
|
|
|
|
|
|
/* Check for on-bridge speed limit */
|
|
|
|
if (!IsWaterTT() && IsBridgeTile(m_old_tile)) {
|
|
|
|
int spd = GetBridgeSpec(GetBridgeType(m_old_tile))->speed;
|
|
|
|
if (IsRoadTT()) spd *= 2;
|
|
|
|
if (max_speed > spd) max_speed = spd;
|
|
|
|
}
|
|
|
|
/* Check for speed limit imposed by railtype */
|
|
|
|
if (IsRailTT()) {
|
|
|
|
uint16 rail_speed = GetRailTypeInfo(GetRailType(m_old_tile))->max_speed;
|
|
|
|
if (rail_speed > 0) max_speed = min(max_speed, rail_speed);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* if min speed was requested, return it */
|
|
|
|
if (pmin_speed != NULL) *pmin_speed = min_speed;
|
|
|
|
return max_speed;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
typedef CFollowTrackT<TRANSPORT_WATER, Ship, true > CFollowTrackWater;
|
|
|
|
typedef CFollowTrackT<TRANSPORT_ROAD, RoadVehicle, true > CFollowTrackRoad;
|
|
|
|
typedef CFollowTrackT<TRANSPORT_RAIL, Train, true > CFollowTrackRail;
|
|
|
|
|
|
|
|
typedef CFollowTrackT<TRANSPORT_WATER, Ship, false> CFollowTrackWaterNo90;
|
|
|
|
typedef CFollowTrackT<TRANSPORT_ROAD, RoadVehicle, false> CFollowTrackRoadNo90;
|
|
|
|
typedef CFollowTrackT<TRANSPORT_RAIL, Train, false> CFollowTrackRailNo90;
|
|
|
|
|
|
|
|
typedef CFollowTrackT<TRANSPORT_RAIL, Train, true, true > CFollowTrackFreeRail;
|
|
|
|
typedef CFollowTrackT<TRANSPORT_RAIL, Train, false, true > CFollowTrackFreeRailNo90;
|
|
|
|
|
|
|
|
#endif /* FOLLOW_TRACK_HPP */
|