ai_road.cpp

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00001 /* $Id: ai_road.cpp 15494 2009-02-14 22:06:11Z yexo $ */
00002 
00005 #include "ai_road.hpp"
00006 #include "ai_map.hpp"
00007 #include "ai_station.hpp"
00008 #include "../../station_map.h"
00009 #include "../../command_type.h"
00010 #include "../../settings_type.h"
00011 #include "../../company_func.h"
00012 #include "../../script/squirrel_helper_type.hpp"
00013 
00014 /* static */ bool AIRoad::IsRoadTile(TileIndex tile)
00015 {
00016   if (!::IsValidTile(tile)) return false;
00017 
00018   return (::IsTileType(tile, MP_ROAD) && ::GetRoadTileType(tile) != ROAD_TILE_DEPOT) ||
00019       IsDriveThroughRoadStationTile(tile);
00020 }
00021 
00022 /* static */ bool AIRoad::IsRoadDepotTile(TileIndex tile)
00023 {
00024   if (!::IsValidTile(tile)) return false;
00025 
00026   return ::IsTileType(tile, MP_ROAD) && ::GetRoadTileType(tile) == ROAD_TILE_DEPOT &&
00027       (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00028 }
00029 
00030 /* static */ bool AIRoad::IsRoadStationTile(TileIndex tile)
00031 {
00032   if (!::IsValidTile(tile)) return false;
00033 
00034   return ::IsRoadStopTile(tile) && (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00035 }
00036 
00037 /* static */ bool AIRoad::IsDriveThroughRoadStationTile(TileIndex tile)
00038 {
00039   if (!::IsValidTile(tile)) return false;
00040 
00041   return ::IsDriveThroughStopTile(tile) && (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00042 }
00043 
00044 /* static */ bool AIRoad::IsRoadTypeAvailable(RoadType road_type)
00045 {
00046   return ::HasRoadTypesAvail(_current_company, ::RoadTypeToRoadTypes((::RoadType)road_type));
00047 }
00048 
00049 /* static */ AIRoad::RoadType AIRoad::GetCurrentRoadType()
00050 {
00051   return (RoadType)AIObject::GetRoadType();
00052 }
00053 
00054 /* static */ void AIRoad::SetCurrentRoadType(RoadType road_type)
00055 {
00056   if (!IsRoadTypeAvailable(road_type)) return;
00057 
00058   AIObject::SetRoadType((::RoadType)road_type);
00059 }
00060 
00061 /* static */ bool AIRoad::HasRoadType(TileIndex tile, RoadType road_type)
00062 {
00063   if (!AIMap::IsValidTile(tile)) return false;
00064   if (!IsRoadTypeAvailable(road_type)) return false;
00065   return ::GetAnyRoadBits(tile, (::RoadType)road_type, false) != ROAD_NONE;
00066 }
00067 
00068 /* static */ bool AIRoad::AreRoadTilesConnected(TileIndex t1, TileIndex t2)
00069 {
00070   if (!::IsValidTile(t1)) return false;
00071   if (!::IsValidTile(t2)) return false;
00072 
00073   /* Tiles not neighbouring */
00074   if ((abs((int)::TileX(t1) - (int)::TileX(t2)) + abs((int)::TileY(t1) - (int)::TileY(t2))) != 1) return false;
00075 
00076   RoadBits r1 = ::GetAnyRoadBits(t1, AIObject::GetRoadType());
00077   RoadBits r2 = ::GetAnyRoadBits(t2, AIObject::GetRoadType());
00078 
00079   uint dir_1 = (::TileX(t1) == ::TileX(t2)) ? (::TileY(t1) < ::TileY(t2) ? 2 : 0) : (::TileX(t1) < ::TileX(t2) ? 1 : 3);
00080   uint dir_2 = 2 ^ dir_1;
00081 
00082   DisallowedRoadDirections drd2 = IsNormalRoadTile(t2) ? GetDisallowedRoadDirections(t2) : DRD_NONE;
00083 
00084   return HasBit(r1, dir_1) && HasBit(r2, dir_2) && drd2 != DRD_BOTH && drd2 != (dir_1 > dir_2 ? DRD_SOUTHBOUND : DRD_NORTHBOUND);
00085 }
00086 
00087 /* Helper functions for AIRoad::CanBuildConnectedRoadParts(). */
00088 
00103 static bool CheckAutoExpandedRoadBits(const Array *existing, int32 start, int32 end)
00104 {
00105   return (start + end == 0) && (existing->size == 0 || existing->array[0] == start || existing->array[0] == end);
00106 }
00107 
00118 static int32 LookupWithoutBuildOnSlopes(::Slope slope, const Array *existing, int32 start, int32 end)
00119 {
00120   switch (slope) {
00121     /* Flat slopes can always be build. */
00122     case SLOPE_FLAT:
00123       return 1;
00124 
00125     /* Only 4 of the slopes can be build upon. Testing the existing bits is
00126      * necessary because these bits can be something else when the settings
00127      * in the game have been changed.
00128      */
00129     case SLOPE_NE: case SLOPE_SW:
00130       return (CheckAutoExpandedRoadBits(existing, start, end) && (start == 1 || end == 1)) ? (existing->size == 0 ? 2 : 1) : 0;
00131     case SLOPE_SE: case SLOPE_NW:
00132       return (CheckAutoExpandedRoadBits(existing, start, end) && (start != 1 && end != 1)) ? (existing->size == 0 ? 2 : 1) : 0;
00133 
00134     /* Any other tile cannot be built on. */
00135     default:
00136       return 0;
00137   }
00138 }
00139 
00145 static int32 RotateNeighbour(int32 neighbour)
00146 {
00147   switch (neighbour) {
00148     case -2: return -1;
00149     case -1: return  2;
00150     case  1: return -2;
00151     case  2: return  1;
00152     default: NOT_REACHED();
00153   }
00154 }
00155 
00161 static RoadBits NeighbourToRoadBits(int32 neighbour)
00162 {
00163   switch (neighbour) {
00164     case -2: return ROAD_NW;
00165     case -1: return ROAD_NE;
00166     case  2: return ROAD_SE;
00167     case  1: return ROAD_SW;
00168     default: NOT_REACHED();
00169   }
00170 }
00171 
00182 static int32 LookupWithBuildOnSlopes(::Slope slope, Array *existing, int32 start, int32 end)
00183 {
00184   if (::IsSteepSlope(slope)) {
00185     switch (slope) {
00186       /* On steep slopes one can only build straight roads that will be
00187        * automatically expanded to a straight road. Just check that the existing
00188        * road parts are in the same direction. */
00189       case SLOPE_STEEP_S:
00190       case SLOPE_STEEP_W:
00191       case SLOPE_STEEP_N:
00192       case SLOPE_STEEP_E:
00193         return CheckAutoExpandedRoadBits(existing, start, end) ? (existing->size == 0 ? 2 : 1) : 0;
00194 
00195       /* All other slopes are invalid slopes!. */
00196       default:
00197         return -1;
00198     }
00199   }
00200 
00201   /* The slope is not steep. Furthermore lots of slopes are generally the
00202    * same but are only rotated. So to reduce the amount of lookup work that
00203    * needs to be done the data is made uniform. This means rotating the
00204    * existing parts and updating the slope. */
00205   static const ::Slope base_slopes[] = {
00206     SLOPE_FLAT, SLOPE_W,   SLOPE_W,   SLOPE_SW,
00207     SLOPE_W,    SLOPE_EW,  SLOPE_SW,  SLOPE_WSE,
00208     SLOPE_W,    SLOPE_SW,  SLOPE_EW,  SLOPE_WSE,
00209     SLOPE_SW,   SLOPE_WSE, SLOPE_WSE};
00210   static const byte base_rotates[] = {0, 0, 1, 0, 2, 0, 1, 0, 3, 3, 2, 3, 2, 2, 1};
00211 
00212   if (slope >= (::Slope)lengthof(base_slopes)) {
00213     /* This slope is an invalid slope, so ignore it. */
00214     return -1;
00215   }
00216   byte base_rotate = base_rotates[slope];
00217   slope = base_slopes[slope];
00218 
00219   /* Some slopes don't need rotating, so return early when we know we do
00220    * not need to rotate. */
00221   switch (slope) {
00222     case SLOPE_FLAT:
00223       /* Flat slopes can always be build. */
00224       return 1;
00225 
00226     case SLOPE_EW:
00227     case SLOPE_WSE:
00228       /* A slope similar to a SLOPE_EW or SLOPE_WSE will always cause
00229        * foundations which makes them accessible from all sides. */
00230       return 1;
00231 
00232     case SLOPE_W:
00233     case SLOPE_SW:
00234       /* A slope for which we need perform some calculations. */
00235       break;
00236 
00237     default:
00238       /* An invalid slope. */
00239       return -1;
00240   }
00241 
00242   /* Now perform the actual rotation. */
00243   for (int j = 0; j < base_rotate; j++) {
00244     for (int i = 0; i < existing->size; i++) {
00245       existing->array[i] = RotateNeighbour(existing->array[i]);
00246     }
00247     start = RotateNeighbour(start);
00248     end   = RotateNeighbour(end);
00249   }
00250 
00251   /* Create roadbits out of the data for easier handling. */
00252   RoadBits start_roadbits    = NeighbourToRoadBits(start);
00253   RoadBits new_roadbits      = start_roadbits | NeighbourToRoadBits(end);
00254   RoadBits existing_roadbits = ROAD_NONE;
00255   for (int i = 0; i < existing->size; i++) {
00256     existing_roadbits |= NeighbourToRoadBits(existing->array[i]);
00257   }
00258 
00259   switch (slope) {
00260     case SLOPE_W:
00261       /* A slope similar to a SLOPE_W. */
00262       switch (new_roadbits) {
00263         case  6: // ROAD_SE | ROAD_SW:
00264         case  9: // ROAD_NE | ROAD_NW:
00265         case 12: // ROAD_NE | ROAD_SE:
00266           /* Cannot build anything with a turn from the low side. */
00267           return 0;
00268 
00269         case  5: // ROAD_SE | ROAD_NW:
00270         case 10: // ROAD_NE | ROAD_SW:
00271           /* A 'sloped' tile is going to be build. */
00272           if ((existing_roadbits | new_roadbits) != new_roadbits) {
00273             /* There is already a foundation on the tile, or at least
00274              * another slope that is not compatible with the new one. */
00275             return 0;
00276           }
00277           /* If the start is in the low part, it is automatically
00278            * building the second part too. */
00279           return ((start_roadbits & (ROAD_NE | ROAD_SE)) && !(existing_roadbits & (ROAD_SW | ROAD_NW))) ? 2 : 1;
00280 
00281         default:
00282           /* Roadbits causing a foundation are going to be build.
00283            * When the existing roadbits are slopes (the lower bits
00284            * are used), this cannot be done. */
00285           if ((existing_roadbits | new_roadbits) == new_roadbits) return 1;
00286           return (existing_roadbits & (ROAD_NE | ROAD_SE)) ? 0 : 1;
00287       }
00288 
00289     case SLOPE_SW:
00290       /* A slope similar to a SLOPE_SW. */
00291       switch (new_roadbits) {
00292         case  9: // ROAD_NE | ROAD_NW:
00293         case 12: // ROAD_NE | ROAD_SE:
00294           /* Cannot build anything with a turn from the low side. */
00295           return 0;
00296 
00297         case 10: // ROAD_NE | ROAD_SW:
00298           /* A 'sloped' tile is going to be build. */
00299           if ((existing_roadbits | new_roadbits) != new_roadbits) {
00300             /* There is already a foundation on the tile, or at least
00301              * another slope that is not compatible with the new one. */
00302             return 0;
00303           }
00304           /* If the start is in the low part, it is automatically
00305            * building the second part too. */
00306           return ((start_roadbits & ROAD_NE) && !(existing_roadbits & ROAD_SW)) ? 2 : 1;
00307 
00308         default:
00309           /* Roadbits causing a foundation are going to be build.
00310            * When the existing roadbits are slopes (the lower bits
00311            * are used), this cannot be done. */
00312           return (existing_roadbits & ROAD_NE) ? 0 : 1;
00313       }
00314 
00315     default:
00316       NOT_REACHED();
00317   }
00318 }
00319 
00330 static bool NormaliseTileOffset(int32 *tile)
00331 {
00332     if (*tile == 1 || *tile == -1) return true;
00333     if (*tile == ::TileDiffXY(0, -1)) {
00334       *tile = -2;
00335       return true;
00336     }
00337     if (*tile == ::TileDiffXY(0, 1)) {
00338       *tile = 2;
00339       return true;
00340     }
00341     return false;
00342 }
00343 
00344 /* static */ int32 AIRoad::CanBuildConnectedRoadParts(AITile::Slope slope_, Array *existing, TileIndex start_, TileIndex end_)
00345 {
00346 	::Slope slope = (::Slope)slope_;
00347   int32 start = start_;
00348   int32 end = end_;
00349 
00350   /* The start tile and end tile cannot be the same tile either. */
00351   if (start == end) return -1;
00352 
00353   for (int i = 0; i < existing->size; i++) {
00354     if (!NormaliseTileOffset(&existing->array[i])) return -1;
00355   }
00356 
00357   if (!NormaliseTileOffset(&start)) return -1;
00358   if (!NormaliseTileOffset(&end)) return -1;
00359 
00360   /* Without build on slopes the characteristics are vastly different, so use
00361    * a different helper function (one that is much simpler). */
00362   return _settings_game.construction.build_on_slopes ? LookupWithBuildOnSlopes(slope, existing, start, end) : LookupWithoutBuildOnSlopes(slope, existing, start, end);
00363 }
00364 
00365 /* static */ int32 AIRoad::CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end)
00366 {
00367   if (!::IsValidTile(tile) || !::IsValidTile(start) || !::IsValidTile(end)) return -1;
00368   if (::DistanceManhattan(tile, start) != 1 || ::DistanceManhattan(tile, end) != 1) return -1;
00369 
00370   /*                                       ROAD_NW              ROAD_SW             ROAD_SE             ROAD_NE */
00371   static const TileIndex neighbours[] = {::TileDiffXY(0, -1), ::TileDiffXY(1, 0), ::TileDiffXY(0, 1), ::TileDiffXY(-1, 0)};
00372   Array *existing = (Array*)alloca(sizeof(Array) + lengthof(neighbours) * sizeof(int32));
00373   existing->size = 0;
00374 
00375 	::RoadBits rb = ::ROAD_NONE;
00376   if (::IsNormalRoadTile(tile)) {
00377     rb = ::GetAllRoadBits(tile);
00378   } else {
00379     for (::RoadType rt = ::ROADTYPE_BEGIN; rt < ::ROADTYPE_END; rt++) rb |= ::GetAnyRoadBits(tile, rt);
00380   }
00381   for (uint i = 0; i < lengthof(neighbours); i++) {
00382     if (HasBit(rb, i)) existing->array[existing->size++] = neighbours[i];
00383   }
00384 
00385   return AIRoad::CanBuildConnectedRoadParts(AITile::GetSlope(tile), existing, start - tile, end - tile);
00386 }
00387 
00395 static bool NeighbourHasReachableRoad(::RoadTypes rts, TileIndex start_tile, DiagDirection neighbour)
00396 {
00397   TileIndex neighbour_tile = ::TileAddByDiagDir(start_tile, neighbour);
00398   if ((rts & ::GetRoadTypes(neighbour_tile)) == 0) return false;
00399 
00400   switch (::GetTileType(neighbour_tile)) {
00401     case MP_ROAD:
00402       return (::GetRoadTileType(neighbour_tile) != ROAD_TILE_DEPOT);
00403 
00404     case MP_STATION:
00405       if (::IsDriveThroughStopTile(neighbour_tile)) {
00406         return (::DiagDirToAxis(neighbour) == ::DiagDirToAxis(::GetRoadStopDir(neighbour_tile)));
00407       }
00408       return false;
00409 
00410     default:
00411       return false;
00412   }
00413 }
00414 
00415 /* static */ int32 AIRoad::GetNeighbourRoadCount(TileIndex tile)
00416 {
00417   if (!::IsValidTile(tile)) return false;
00418 
00419 	::RoadTypes rts = ::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType());
00420   int32 neighbour = 0;
00421 
00422   if (TileX(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NE)) neighbour++;
00423   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SE)) neighbour++;
00424   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SW)) neighbour++;
00425   if (TileY(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NW)) neighbour++;
00426 
00427   return neighbour;
00428 }
00429 
00430 /* static */ TileIndex AIRoad::GetRoadDepotFrontTile(TileIndex depot)
00431 {
00432   if (!IsRoadDepotTile(depot)) return INVALID_TILE;
00433 
00434   return depot + ::TileOffsByDiagDir(::GetRoadDepotDirection(depot));
00435 }
00436 
00437 /* static */ TileIndex AIRoad::GetRoadStationFrontTile(TileIndex station)
00438 {
00439   if (!IsRoadStationTile(station)) return INVALID_TILE;
00440 
00441   return station + ::TileOffsByDiagDir(::GetRoadStopDir(station));
00442 }
00443 
00444 /* static */ TileIndex AIRoad::GetDriveThroughBackTile(TileIndex station)
00445 {
00446   if (!IsDriveThroughRoadStationTile(station)) return INVALID_TILE;
00447 
00448   return station + ::TileOffsByDiagDir(::ReverseDiagDir(::GetRoadStopDir(station)));
00449 }
00450 
00451 /* static */ bool AIRoad::_BuildRoadInternal(TileIndex start, TileIndex end, bool one_way, bool full)
00452 {
00453   EnforcePrecondition(false, start != end);
00454   EnforcePrecondition(false, ::IsValidTile(start));
00455   EnforcePrecondition(false, ::IsValidTile(end));
00456   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00457   EnforcePrecondition(false, !one_way || AIObject::GetRoadType() == ::ROADTYPE_ROAD);
00458 
00459   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (((start < end) == !full) ? 1 : 2) | (AIObject::GetRoadType() << 3) | ((one_way ? 1 : 0) << 5), CMD_BUILD_LONG_ROAD);
00460 }
00461 
00462 /* static */ bool AIRoad::BuildRoad(TileIndex start, TileIndex end)
00463 {
00464   return _BuildRoadInternal(start, end, false, false);
00465 }
00466 
00467 /* static */ bool AIRoad::BuildOneWayRoad(TileIndex start, TileIndex end)
00468 {
00469   return _BuildRoadInternal(start, end, true, false);
00470 }
00471 
00472 /* static */ bool AIRoad::BuildRoadFull(TileIndex start, TileIndex end)
00473 {
00474   return _BuildRoadInternal(start, end, false, true);
00475 }
00476 
00477 /* static */ bool AIRoad::BuildOneWayRoadFull(TileIndex start, TileIndex end)
00478 {
00479   return _BuildRoadInternal(start, end, true, true);
00480 }
00481 
00482 /* static */ bool AIRoad::BuildRoadDepot(TileIndex tile, TileIndex front)
00483 {
00484   EnforcePrecondition(false, tile != front);
00485   EnforcePrecondition(false, ::IsValidTile(tile));
00486   EnforcePrecondition(false, ::IsValidTile(front));
00487   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
00488 
00489   uint entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
00490 
00491   return AIObject::DoCommand(tile, entrance_dir | (AIObject::GetRoadType() << 2), 0, CMD_BUILD_ROAD_DEPOT);
00492 }
00493 
00494 /* static */ bool AIRoad::_BuildRoadStationInternal(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, bool drive_through, StationID station_id)
00495 {
00496   EnforcePrecondition(false, tile != front);
00497   EnforcePrecondition(false, ::IsValidTile(tile));
00498   EnforcePrecondition(false, ::IsValidTile(front));
00499   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
00500   EnforcePrecondition(false, station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id));
00501   EnforcePrecondition(false, road_veh_type == ROADVEHTYPE_BUS || road_veh_type == ROADVEHTYPE_TRUCK);
00502 
00503   uint entrance_dir;
00504   if (drive_through) {
00505     entrance_dir = ::TileY(tile) != ::TileY(front);
00506   } else {
00507     entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
00508   }
00509 
00510   uint p2 = station_id == AIStation::STATION_JOIN_ADJACENT ? 0 : 32;
00511   p2 |= drive_through ? 2 : 0;
00512   p2 |= road_veh_type == ROADVEHTYPE_TRUCK ? 1 : 0;
00513   p2 |= ::RoadTypeToRoadTypes(AIObject::GetRoadType()) << 2;
00514   p2 |= (AIStation::IsValidStation(station_id) ? station_id : INVALID_STATION) << 16;
00515   return AIObject::DoCommand(tile, entrance_dir, p2, CMD_BUILD_ROAD_STOP);
00516 }
00517 
00518 /* static */ bool AIRoad::BuildRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
00519 {
00520   return _BuildRoadStationInternal(tile, front, road_veh_type, false, station_id);
00521 }
00522 
00523 /* static */ bool AIRoad::BuildDriveThroughRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
00524 {
00525   return _BuildRoadStationInternal(tile, front, road_veh_type, true, station_id);
00526 }
00527 
00528 /* static */ bool AIRoad::RemoveRoad(TileIndex start, TileIndex end)
00529 {
00530   EnforcePrecondition(false, ::IsValidTile(start));
00531   EnforcePrecondition(false, ::IsValidTile(end));
00532   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00533 
00534   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 1 : 2) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
00535 }
00536 
00537 /* static */ bool AIRoad::RemoveRoadFull(TileIndex start, TileIndex end)
00538 {
00539   EnforcePrecondition(false, ::IsValidTile(start));
00540   EnforcePrecondition(false, ::IsValidTile(end));
00541   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00542 
00543   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 2 : 1) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
00544 }
00545 
00546 /* static */ bool AIRoad::RemoveRoadDepot(TileIndex tile)
00547 {
00548   EnforcePrecondition(false, ::IsValidTile(tile));
00549   EnforcePrecondition(false, IsTileType(tile, MP_ROAD))
00550   EnforcePrecondition(false, GetRoadTileType(tile) == ROAD_TILE_DEPOT);
00551 
00552   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
00553 }
00554 
00555 /* static */ bool AIRoad::RemoveRoadStation(TileIndex tile)
00556 {
00557   EnforcePrecondition(false, ::IsValidTile(tile));
00558   EnforcePrecondition(false, IsTileType(tile, MP_STATION));
00559   EnforcePrecondition(false, IsRoadStop(tile));
00560 
00561   return AIObject::DoCommand(tile, 0, GetRoadStopType(tile), CMD_REMOVE_ROAD_STOP);
00562 }

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