ai_road.cpp

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00001 /* $Id: ai_road.cpp 15904 2009-03-30 23:22:13Z rubidium $ */
00002 
00005 #include "ai_road.hpp"
00006 #include "ai_map.hpp"
00007 #include "ai_station.hpp"
00008 #include "ai_cargo.hpp"
00009 #include "../../station_map.h"
00010 #include "../../command_type.h"
00011 #include "../../settings_type.h"
00012 #include "../../company_func.h"
00013 #include "../../script/squirrel_helper_type.hpp"
00014 
00015 /* static */ AIRoad::RoadVehicleType AIRoad::GetRoadVehicleTypeForCargo(CargoID cargo_type)
00016 {
00017   return AICargo::HasCargoClass(cargo_type, AICargo::CC_PASSENGERS) ? ROADVEHTYPE_BUS : ROADVEHTYPE_TRUCK;
00018 }
00019 
00020 /* static */ bool AIRoad::IsRoadTile(TileIndex tile)
00021 {
00022   if (!::IsValidTile(tile)) return false;
00023 
00024   return (::IsTileType(tile, MP_ROAD) && ::GetRoadTileType(tile) != ROAD_TILE_DEPOT) ||
00025       IsDriveThroughRoadStationTile(tile);
00026 }
00027 
00028 /* static */ bool AIRoad::IsRoadDepotTile(TileIndex tile)
00029 {
00030   if (!::IsValidTile(tile)) return false;
00031 
00032   return ::IsTileType(tile, MP_ROAD) && ::GetRoadTileType(tile) == ROAD_TILE_DEPOT &&
00033       (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00034 }
00035 
00036 /* static */ bool AIRoad::IsRoadStationTile(TileIndex tile)
00037 {
00038   if (!::IsValidTile(tile)) return false;
00039 
00040   return ::IsRoadStopTile(tile) && (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00041 }
00042 
00043 /* static */ bool AIRoad::IsDriveThroughRoadStationTile(TileIndex tile)
00044 {
00045   if (!::IsValidTile(tile)) return false;
00046 
00047   return ::IsDriveThroughStopTile(tile) && (::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType()) & ::GetRoadTypes(tile)) != 0;
00048 }
00049 
00050 /* static */ bool AIRoad::IsRoadTypeAvailable(RoadType road_type)
00051 {
00052   return ::HasRoadTypesAvail(_current_company, ::RoadTypeToRoadTypes((::RoadType)road_type));
00053 }
00054 
00055 /* static */ AIRoad::RoadType AIRoad::GetCurrentRoadType()
00056 {
00057   return (RoadType)AIObject::GetRoadType();
00058 }
00059 
00060 /* static */ void AIRoad::SetCurrentRoadType(RoadType road_type)
00061 {
00062   if (!IsRoadTypeAvailable(road_type)) return;
00063 
00064   AIObject::SetRoadType((::RoadType)road_type);
00065 }
00066 
00067 /* static */ bool AIRoad::HasRoadType(TileIndex tile, RoadType road_type)
00068 {
00069   if (!AIMap::IsValidTile(tile)) return false;
00070   if (!IsRoadTypeAvailable(road_type)) return false;
00071   return ::GetAnyRoadBits(tile, (::RoadType)road_type, false) != ROAD_NONE;
00072 }
00073 
00074 /* static */ bool AIRoad::AreRoadTilesConnected(TileIndex t1, TileIndex t2)
00075 {
00076   if (!::IsValidTile(t1)) return false;
00077   if (!::IsValidTile(t2)) return false;
00078 
00079   /* Tiles not neighbouring */
00080   if ((abs((int)::TileX(t1) - (int)::TileX(t2)) + abs((int)::TileY(t1) - (int)::TileY(t2))) != 1) return false;
00081 
00082   RoadBits r1 = ::GetAnyRoadBits(t1, AIObject::GetRoadType());
00083   RoadBits r2 = ::GetAnyRoadBits(t2, AIObject::GetRoadType());
00084 
00085   uint dir_1 = (::TileX(t1) == ::TileX(t2)) ? (::TileY(t1) < ::TileY(t2) ? 2 : 0) : (::TileX(t1) < ::TileX(t2) ? 1 : 3);
00086   uint dir_2 = 2 ^ dir_1;
00087 
00088   DisallowedRoadDirections drd2 = IsNormalRoadTile(t2) ? GetDisallowedRoadDirections(t2) : DRD_NONE;
00089 
00090   return HasBit(r1, dir_1) && HasBit(r2, dir_2) && drd2 != DRD_BOTH && drd2 != (dir_1 > dir_2 ? DRD_SOUTHBOUND : DRD_NORTHBOUND);
00091 }
00092 
00093 /* Helper functions for AIRoad::CanBuildConnectedRoadParts(). */
00094 
00109 static bool CheckAutoExpandedRoadBits(const Array *existing, int32 start, int32 end)
00110 {
00111   return (start + end == 0) && (existing->size == 0 || existing->array[0] == start || existing->array[0] == end);
00112 }
00113 
00124 static int32 LookupWithoutBuildOnSlopes(::Slope slope, const Array *existing, int32 start, int32 end)
00125 {
00126   switch (slope) {
00127     /* Flat slopes can always be build. */
00128     case SLOPE_FLAT:
00129       return 1;
00130 
00131     /* Only 4 of the slopes can be build upon. Testing the existing bits is
00132      * necessary because these bits can be something else when the settings
00133      * in the game have been changed.
00134      */
00135     case SLOPE_NE: case SLOPE_SW:
00136       return (CheckAutoExpandedRoadBits(existing, start, end) && (start == 1 || end == 1)) ? (existing->size == 0 ? 2 : 1) : 0;
00137     case SLOPE_SE: case SLOPE_NW:
00138       return (CheckAutoExpandedRoadBits(existing, start, end) && (start != 1 && end != 1)) ? (existing->size == 0 ? 2 : 1) : 0;
00139 
00140     /* Any other tile cannot be built on. */
00141     default:
00142       return 0;
00143   }
00144 }
00145 
00151 static int32 RotateNeighbour(int32 neighbour)
00152 {
00153   switch (neighbour) {
00154     case -2: return -1;
00155     case -1: return  2;
00156     case  1: return -2;
00157     case  2: return  1;
00158     default: NOT_REACHED();
00159   }
00160 }
00161 
00167 static RoadBits NeighbourToRoadBits(int32 neighbour)
00168 {
00169   switch (neighbour) {
00170     case -2: return ROAD_NW;
00171     case -1: return ROAD_NE;
00172     case  2: return ROAD_SE;
00173     case  1: return ROAD_SW;
00174     default: NOT_REACHED();
00175   }
00176 }
00177 
00188 static int32 LookupWithBuildOnSlopes(::Slope slope, Array *existing, int32 start, int32 end)
00189 {
00190   if (::IsSteepSlope(slope)) {
00191     switch (slope) {
00192       /* On steep slopes one can only build straight roads that will be
00193        * automatically expanded to a straight road. Just check that the existing
00194        * road parts are in the same direction. */
00195       case SLOPE_STEEP_S:
00196       case SLOPE_STEEP_W:
00197       case SLOPE_STEEP_N:
00198       case SLOPE_STEEP_E:
00199         return CheckAutoExpandedRoadBits(existing, start, end) ? (existing->size == 0 ? 2 : 1) : 0;
00200 
00201       /* All other slopes are invalid slopes!. */
00202       default:
00203         return -1;
00204     }
00205   }
00206 
00207   /* The slope is not steep. Furthermore lots of slopes are generally the
00208    * same but are only rotated. So to reduce the amount of lookup work that
00209    * needs to be done the data is made uniform. This means rotating the
00210    * existing parts and updating the slope. */
00211   static const ::Slope base_slopes[] = {
00212     SLOPE_FLAT, SLOPE_W,   SLOPE_W,   SLOPE_SW,
00213     SLOPE_W,    SLOPE_EW,  SLOPE_SW,  SLOPE_WSE,
00214     SLOPE_W,    SLOPE_SW,  SLOPE_EW,  SLOPE_WSE,
00215     SLOPE_SW,   SLOPE_WSE, SLOPE_WSE};
00216   static const byte base_rotates[] = {0, 0, 1, 0, 2, 0, 1, 0, 3, 3, 2, 3, 2, 2, 1};
00217 
00218   if (slope >= (::Slope)lengthof(base_slopes)) {
00219     /* This slope is an invalid slope, so ignore it. */
00220     return -1;
00221   }
00222   byte base_rotate = base_rotates[slope];
00223   slope = base_slopes[slope];
00224 
00225   /* Some slopes don't need rotating, so return early when we know we do
00226    * not need to rotate. */
00227   switch (slope) {
00228     case SLOPE_FLAT:
00229       /* Flat slopes can always be build. */
00230       return 1;
00231 
00232     case SLOPE_EW:
00233     case SLOPE_WSE:
00234       /* A slope similar to a SLOPE_EW or SLOPE_WSE will always cause
00235        * foundations which makes them accessible from all sides. */
00236       return 1;
00237 
00238     case SLOPE_W:
00239     case SLOPE_SW:
00240       /* A slope for which we need perform some calculations. */
00241       break;
00242 
00243     default:
00244       /* An invalid slope. */
00245       return -1;
00246   }
00247 
00248   /* Now perform the actual rotation. */
00249   for (int j = 0; j < base_rotate; j++) {
00250     for (int i = 0; i < existing->size; i++) {
00251       existing->array[i] = RotateNeighbour(existing->array[i]);
00252     }
00253     start = RotateNeighbour(start);
00254     end   = RotateNeighbour(end);
00255   }
00256 
00257   /* Create roadbits out of the data for easier handling. */
00258   RoadBits start_roadbits    = NeighbourToRoadBits(start);
00259   RoadBits new_roadbits      = start_roadbits | NeighbourToRoadBits(end);
00260   RoadBits existing_roadbits = ROAD_NONE;
00261   for (int i = 0; i < existing->size; i++) {
00262     existing_roadbits |= NeighbourToRoadBits(existing->array[i]);
00263   }
00264 
00265   switch (slope) {
00266     case SLOPE_W:
00267       /* A slope similar to a SLOPE_W. */
00268       switch (new_roadbits) {
00269         case  6: // ROAD_SE | ROAD_SW:
00270         case  9: // ROAD_NE | ROAD_NW:
00271         case 12: // ROAD_NE | ROAD_SE:
00272           /* Cannot build anything with a turn from the low side. */
00273           return 0;
00274 
00275         case  5: // ROAD_SE | ROAD_NW:
00276         case 10: // ROAD_NE | ROAD_SW:
00277           /* A 'sloped' tile is going to be build. */
00278           if ((existing_roadbits | new_roadbits) != new_roadbits) {
00279             /* There is already a foundation on the tile, or at least
00280              * another slope that is not compatible with the new one. */
00281             return 0;
00282           }
00283           /* If the start is in the low part, it is automatically
00284            * building the second part too. */
00285           return ((start_roadbits & (ROAD_NE | ROAD_SE)) && !(existing_roadbits & (ROAD_SW | ROAD_NW))) ? 2 : 1;
00286 
00287         default:
00288           /* Roadbits causing a foundation are going to be build.
00289            * When the existing roadbits are slopes (the lower bits
00290            * are used), this cannot be done. */
00291           if ((existing_roadbits | new_roadbits) == new_roadbits) return 1;
00292           return (existing_roadbits & (ROAD_NE | ROAD_SE)) ? 0 : 1;
00293       }
00294 
00295     case SLOPE_SW:
00296       /* A slope similar to a SLOPE_SW. */
00297       switch (new_roadbits) {
00298         case  9: // ROAD_NE | ROAD_NW:
00299         case 12: // ROAD_NE | ROAD_SE:
00300           /* Cannot build anything with a turn from the low side. */
00301           return 0;
00302 
00303         case 10: // ROAD_NE | ROAD_SW:
00304           /* A 'sloped' tile is going to be build. */
00305           if ((existing_roadbits | new_roadbits) != new_roadbits) {
00306             /* There is already a foundation on the tile, or at least
00307              * another slope that is not compatible with the new one. */
00308             return 0;
00309           }
00310           /* If the start is in the low part, it is automatically
00311            * building the second part too. */
00312           return ((start_roadbits & ROAD_NE) && !(existing_roadbits & ROAD_SW)) ? 2 : 1;
00313 
00314         default:
00315           /* Roadbits causing a foundation are going to be build.
00316            * When the existing roadbits are slopes (the lower bits
00317            * are used), this cannot be done. */
00318           return (existing_roadbits & ROAD_NE) ? 0 : 1;
00319       }
00320 
00321     default:
00322       NOT_REACHED();
00323   }
00324 }
00325 
00336 static bool NormaliseTileOffset(int32 *tile)
00337 {
00338     if (*tile == 1 || *tile == -1) return true;
00339     if (*tile == ::TileDiffXY(0, -1)) {
00340       *tile = -2;
00341       return true;
00342     }
00343     if (*tile == ::TileDiffXY(0, 1)) {
00344       *tile = 2;
00345       return true;
00346     }
00347     return false;
00348 }
00349 
00350 /* static */ int32 AIRoad::CanBuildConnectedRoadParts(AITile::Slope slope_, Array *existing, TileIndex start_, TileIndex end_)
00351 {
00352 	::Slope slope = (::Slope)slope_;
00353   int32 start = start_;
00354   int32 end = end_;
00355 
00356   /* The start tile and end tile cannot be the same tile either. */
00357   if (start == end) return -1;
00358 
00359   for (int i = 0; i < existing->size; i++) {
00360     if (!NormaliseTileOffset(&existing->array[i])) return -1;
00361   }
00362 
00363   if (!NormaliseTileOffset(&start)) return -1;
00364   if (!NormaliseTileOffset(&end)) return -1;
00365 
00366   /* Without build on slopes the characteristics are vastly different, so use
00367    * a different helper function (one that is much simpler). */
00368   return _settings_game.construction.build_on_slopes ? LookupWithBuildOnSlopes(slope, existing, start, end) : LookupWithoutBuildOnSlopes(slope, existing, start, end);
00369 }
00370 
00371 /* static */ int32 AIRoad::CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end)
00372 {
00373   if (!::IsValidTile(tile) || !::IsValidTile(start) || !::IsValidTile(end)) return -1;
00374   if (::DistanceManhattan(tile, start) != 1 || ::DistanceManhattan(tile, end) != 1) return -1;
00375 
00376   /*                                       ROAD_NW              ROAD_SW             ROAD_SE             ROAD_NE */
00377   static const TileIndex neighbours[] = {::TileDiffXY(0, -1), ::TileDiffXY(1, 0), ::TileDiffXY(0, 1), ::TileDiffXY(-1, 0)};
00378   Array *existing = (Array*)alloca(sizeof(Array) + lengthof(neighbours) * sizeof(int32));
00379   existing->size = 0;
00380 
00381 	::RoadBits rb = ::ROAD_NONE;
00382   if (::IsNormalRoadTile(tile)) {
00383     rb = ::GetAllRoadBits(tile);
00384   } else {
00385     for (::RoadType rt = ::ROADTYPE_BEGIN; rt < ::ROADTYPE_END; rt++) rb |= ::GetAnyRoadBits(tile, rt);
00386   }
00387   for (uint i = 0; i < lengthof(neighbours); i++) {
00388     if (HasBit(rb, i)) existing->array[existing->size++] = neighbours[i];
00389   }
00390 
00391   return AIRoad::CanBuildConnectedRoadParts(AITile::GetSlope(tile), existing, start - tile, end - tile);
00392 }
00393 
00401 static bool NeighbourHasReachableRoad(::RoadTypes rts, TileIndex start_tile, DiagDirection neighbour)
00402 {
00403   TileIndex neighbour_tile = ::TileAddByDiagDir(start_tile, neighbour);
00404   if ((rts & ::GetRoadTypes(neighbour_tile)) == 0) return false;
00405 
00406   switch (::GetTileType(neighbour_tile)) {
00407     case MP_ROAD:
00408       return (::GetRoadTileType(neighbour_tile) != ROAD_TILE_DEPOT);
00409 
00410     case MP_STATION:
00411       if (::IsDriveThroughStopTile(neighbour_tile)) {
00412         return (::DiagDirToAxis(neighbour) == ::DiagDirToAxis(::GetRoadStopDir(neighbour_tile)));
00413       }
00414       return false;
00415 
00416     default:
00417       return false;
00418   }
00419 }
00420 
00421 /* static */ int32 AIRoad::GetNeighbourRoadCount(TileIndex tile)
00422 {
00423   if (!::IsValidTile(tile)) return false;
00424 
00425 	::RoadTypes rts = ::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType());
00426   int32 neighbour = 0;
00427 
00428   if (TileX(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NE)) neighbour++;
00429   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SE)) neighbour++;
00430   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SW)) neighbour++;
00431   if (TileY(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NW)) neighbour++;
00432 
00433   return neighbour;
00434 }
00435 
00436 /* static */ TileIndex AIRoad::GetRoadDepotFrontTile(TileIndex depot)
00437 {
00438   if (!IsRoadDepotTile(depot)) return INVALID_TILE;
00439 
00440   return depot + ::TileOffsByDiagDir(::GetRoadDepotDirection(depot));
00441 }
00442 
00443 /* static */ TileIndex AIRoad::GetRoadStationFrontTile(TileIndex station)
00444 {
00445   if (!IsRoadStationTile(station)) return INVALID_TILE;
00446 
00447   return station + ::TileOffsByDiagDir(::GetRoadStopDir(station));
00448 }
00449 
00450 /* static */ TileIndex AIRoad::GetDriveThroughBackTile(TileIndex station)
00451 {
00452   if (!IsDriveThroughRoadStationTile(station)) return INVALID_TILE;
00453 
00454   return station + ::TileOffsByDiagDir(::ReverseDiagDir(::GetRoadStopDir(station)));
00455 }
00456 
00457 /* static */ bool AIRoad::_BuildRoadInternal(TileIndex start, TileIndex end, bool one_way, bool full)
00458 {
00459   EnforcePrecondition(false, start != end);
00460   EnforcePrecondition(false, ::IsValidTile(start));
00461   EnforcePrecondition(false, ::IsValidTile(end));
00462   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00463   EnforcePrecondition(false, !one_way || AIObject::GetRoadType() == ::ROADTYPE_ROAD);
00464 
00465   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);
00466 }
00467 
00468 /* static */ bool AIRoad::BuildRoad(TileIndex start, TileIndex end)
00469 {
00470   return _BuildRoadInternal(start, end, false, false);
00471 }
00472 
00473 /* static */ bool AIRoad::BuildOneWayRoad(TileIndex start, TileIndex end)
00474 {
00475   return _BuildRoadInternal(start, end, true, false);
00476 }
00477 
00478 /* static */ bool AIRoad::BuildRoadFull(TileIndex start, TileIndex end)
00479 {
00480   return _BuildRoadInternal(start, end, false, true);
00481 }
00482 
00483 /* static */ bool AIRoad::BuildOneWayRoadFull(TileIndex start, TileIndex end)
00484 {
00485   return _BuildRoadInternal(start, end, true, true);
00486 }
00487 
00488 /* static */ bool AIRoad::BuildRoadDepot(TileIndex tile, TileIndex front)
00489 {
00490   EnforcePrecondition(false, tile != front);
00491   EnforcePrecondition(false, ::IsValidTile(tile));
00492   EnforcePrecondition(false, ::IsValidTile(front));
00493   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
00494 
00495   uint entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
00496 
00497   return AIObject::DoCommand(tile, entrance_dir | (AIObject::GetRoadType() << 2), 0, CMD_BUILD_ROAD_DEPOT);
00498 }
00499 
00500 /* static */ bool AIRoad::_BuildRoadStationInternal(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, bool drive_through, StationID station_id)
00501 {
00502   EnforcePrecondition(false, tile != front);
00503   EnforcePrecondition(false, ::IsValidTile(tile));
00504   EnforcePrecondition(false, ::IsValidTile(front));
00505   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
00506   EnforcePrecondition(false, station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id));
00507   EnforcePrecondition(false, road_veh_type == ROADVEHTYPE_BUS || road_veh_type == ROADVEHTYPE_TRUCK);
00508 
00509   uint entrance_dir;
00510   if (drive_through) {
00511     entrance_dir = ::TileY(tile) != ::TileY(front);
00512   } else {
00513     entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
00514   }
00515 
00516   uint p2 = station_id == AIStation::STATION_JOIN_ADJACENT ? 0 : 32;
00517   p2 |= drive_through ? 2 : 0;
00518   p2 |= road_veh_type == ROADVEHTYPE_TRUCK ? 1 : 0;
00519   p2 |= ::RoadTypeToRoadTypes(AIObject::GetRoadType()) << 2;
00520   p2 |= (AIStation::IsValidStation(station_id) ? station_id : INVALID_STATION) << 16;
00521   return AIObject::DoCommand(tile, entrance_dir, p2, CMD_BUILD_ROAD_STOP);
00522 }
00523 
00524 /* static */ bool AIRoad::BuildRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
00525 {
00526   return _BuildRoadStationInternal(tile, front, road_veh_type, false, station_id);
00527 }
00528 
00529 /* static */ bool AIRoad::BuildDriveThroughRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
00530 {
00531   return _BuildRoadStationInternal(tile, front, road_veh_type, true, station_id);
00532 }
00533 
00534 /* static */ bool AIRoad::RemoveRoad(TileIndex start, TileIndex end)
00535 {
00536   EnforcePrecondition(false, ::IsValidTile(start));
00537   EnforcePrecondition(false, ::IsValidTile(end));
00538   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00539 
00540   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 1 : 2) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
00541 }
00542 
00543 /* static */ bool AIRoad::RemoveRoadFull(TileIndex start, TileIndex end)
00544 {
00545   EnforcePrecondition(false, ::IsValidTile(start));
00546   EnforcePrecondition(false, ::IsValidTile(end));
00547   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
00548 
00549   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 2 : 1) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
00550 }
00551 
00552 /* static */ bool AIRoad::RemoveRoadDepot(TileIndex tile)
00553 {
00554   EnforcePrecondition(false, ::IsValidTile(tile));
00555   EnforcePrecondition(false, IsTileType(tile, MP_ROAD))
00556   EnforcePrecondition(false, GetRoadTileType(tile) == ROAD_TILE_DEPOT);
00557 
00558   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
00559 }
00560 
00561 /* static */ bool AIRoad::RemoveRoadStation(TileIndex tile)
00562 {
00563   EnforcePrecondition(false, ::IsValidTile(tile));
00564   EnforcePrecondition(false, IsTileType(tile, MP_STATION));
00565   EnforcePrecondition(false, IsRoadStop(tile));
00566 
00567   return AIObject::DoCommand(tile, 0, GetRoadStopType(tile), CMD_REMOVE_ROAD_STOP);
00568 }

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