# ai_road.cpp

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    00001 /* $Id: ai_road.cpp 17235 2009-08-20 12:22:31Z 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   if (!IsRoadTypeAvailable(GetCurrentRoadType())) return false;
    00079
    00080   /* Tiles not neighbouring */
    00081   if ((abs((int)::TileX(t1) - (int)::TileX(t2)) + abs((int)::TileY(t1) - (int)::TileY(t2))) != 1) return false;
    00082
    00083   RoadBits r1 = ::GetAnyRoadBits(t1, AIObject::GetRoadType());
    00084   RoadBits r2 = ::GetAnyRoadBits(t2, AIObject::GetRoadType());
    00085
    00086   uint dir_1 = (::TileX(t1) == ::TileX(t2)) ? (::TileY(t1) < ::TileY(t2) ? 2 : 0) : (::TileX(t1) < ::TileX(t2) ? 1 : 3);
    00087   uint dir_2 = 2 ^ dir_1;
    00088
    00089   DisallowedRoadDirections drd2 = IsNormalRoadTile(t2) ? GetDisallowedRoadDirections(t2) : DRD_NONE;
    00090
    00091   return HasBit(r1, dir_1) && HasBit(r2, dir_2) && drd2 != DRD_BOTH && drd2 != (dir_1 > dir_2 ? DRD_SOUTHBOUND : DRD_NORTHBOUND);
    00092 }
    00093
    00094 /* Helper functions for AIRoad::CanBuildConnectedRoadParts(). */
    00095
    00110 static bool CheckAutoExpandedRoadBits(const Array *existing, int32 start, int32 end)
    00111 {
    00112   return (start + end == 0) && (existing->size == 0 || existing->array[0] == start || existing->array[0] == end);
    00113 }
    00114
    00125 static int32 LookupWithoutBuildOnSlopes(::Slope slope, const Array *existing, int32 start, int32 end)
    00126 {
    00127   switch (slope) {
    00128     /* Flat slopes can always be build. */
    00129     case SLOPE_FLAT:
    00130       return 1;
    00131
    00132     /* Only 4 of the slopes can be build upon. Testing the existing bits is
    00133      * necessary because these bits can be something else when the settings
    00134      * in the game have been changed.
    00135      */
    00136     case SLOPE_NE: case SLOPE_SW:
    00137       return (CheckAutoExpandedRoadBits(existing, start, end) && (start == 1 || end == 1)) ? (existing->size == 0 ? 2 : 1) : 0;
    00138     case SLOPE_SE: case SLOPE_NW:
    00139       return (CheckAutoExpandedRoadBits(existing, start, end) && (start != 1 && end != 1)) ? (existing->size == 0 ? 2 : 1) : 0;
    00140
    00141     /* Any other tile cannot be built on. */
    00142     default:
    00143       return 0;
    00144   }
    00145 }
    00146
    00152 static int32 RotateNeighbour(int32 neighbour)
    00153 {
    00154   switch (neighbour) {
    00155     case -2: return -1;
    00156     case -1: return  2;
    00157     case  1: return -2;
    00158     case  2: return  1;
    00159     default: NOT_REACHED();
    00160   }
    00161 }
    00162
    00168 static RoadBits NeighbourToRoadBits(int32 neighbour)
    00169 {
    00170   switch (neighbour) {
    00171     case -2: return ROAD_NW;
    00172     case -1: return ROAD_NE;
    00173     case  2: return ROAD_SE;
    00174     case  1: return ROAD_SW;
    00175     default: NOT_REACHED();
    00176   }
    00177 }
    00178
    00189 static int32 LookupWithBuildOnSlopes(::Slope slope, Array *existing, int32 start, int32 end)
    00190 {
    00191   if (::IsSteepSlope(slope)) {
    00192     switch (slope) {
    00193       /* On steep slopes one can only build straight roads that will be
    00194        * automatically expanded to a straight road. Just check that the existing
    00195        * road parts are in the same direction. */
    00196       case SLOPE_STEEP_S:
    00197       case SLOPE_STEEP_W:
    00198       case SLOPE_STEEP_N:
    00199       case SLOPE_STEEP_E:
    00200         return CheckAutoExpandedRoadBits(existing, start, end) ? (existing->size == 0 ? 2 : 1) : 0;
    00201
    00202       /* All other slopes are invalid slopes!. */
    00203       default:
    00204         return -1;
    00205     }
    00206   }
    00207
    00208   /* The slope is not steep. Furthermore lots of slopes are generally the
    00209    * same but are only rotated. So to reduce the amount of lookup work that
    00210    * needs to be done the data is made uniform. This means rotating the
    00211    * existing parts and updating the slope. */
    00212   static const ::Slope base_slopes[] = {
    00213     SLOPE_FLAT, SLOPE_W,   SLOPE_W,   SLOPE_SW,
    00214     SLOPE_W,    SLOPE_EW,  SLOPE_SW,  SLOPE_WSE,
    00215     SLOPE_W,    SLOPE_SW,  SLOPE_EW,  SLOPE_WSE,
    00216     SLOPE_SW,   SLOPE_WSE, SLOPE_WSE};
    00217   static const byte base_rotates[] = {0, 0, 1, 0, 2, 0, 1, 0, 3, 3, 2, 3, 2, 2, 1};
    00218
    00219   if (slope >= (::Slope)lengthof(base_slopes)) {
    00220     /* This slope is an invalid slope, so ignore it. */
    00221     return -1;
    00222   }
    00223   byte base_rotate = base_rotates[slope];
    00224   slope = base_slopes[slope];
    00225
    00226   /* Some slopes don't need rotating, so return early when we know we do
    00227    * not need to rotate. */
    00228   switch (slope) {
    00229     case SLOPE_FLAT:
    00230       /* Flat slopes can always be build. */
    00231       return 1;
    00232
    00233     case SLOPE_EW:
    00234     case SLOPE_WSE:
    00235       /* A slope similar to a SLOPE_EW or SLOPE_WSE will always cause
    00236        * foundations which makes them accessible from all sides. */
    00237       return 1;
    00238
    00239     case SLOPE_W:
    00240     case SLOPE_SW:
    00241       /* A slope for which we need perform some calculations. */
    00242       break;
    00243
    00244     default:
    00245       /* An invalid slope. */
    00246       return -1;
    00247   }
    00248
    00249   /* Now perform the actual rotation. */
    00250   for (int j = 0; j < base_rotate; j++) {
    00251     for (int i = 0; i < existing->size; i++) {
    00252       existing->array[i] = RotateNeighbour(existing->array[i]);
    00253     }
    00254     start = RotateNeighbour(start);
    00255     end   = RotateNeighbour(end);
    00256   }
    00257
    00258   /* Create roadbits out of the data for easier handling. */
    00259   RoadBits start_roadbits    = NeighbourToRoadBits(start);
    00260   RoadBits new_roadbits      = start_roadbits | NeighbourToRoadBits(end);
    00261   RoadBits existing_roadbits = ROAD_NONE;
    00262   for (int i = 0; i < existing->size; i++) {
    00263     existing_roadbits |= NeighbourToRoadBits(existing->array[i]);
    00264   }
    00265
    00266   switch (slope) {
    00267     case SLOPE_W:
    00268       /* A slope similar to a SLOPE_W. */
    00269       switch (new_roadbits) {
    00270         case  6: // ROAD_SE | ROAD_SW:
    00271         case  9: // ROAD_NE | ROAD_NW:
    00272         case 12: // ROAD_NE | ROAD_SE:
    00273           /* Cannot build anything with a turn from the low side. */
    00274           return 0;
    00275
    00276         case  5: // ROAD_SE | ROAD_NW:
    00277         case 10: // ROAD_NE | ROAD_SW:
    00278           /* A 'sloped' tile is going to be build. */
    00279           if ((existing_roadbits | new_roadbits) != new_roadbits) {
    00280             /* There is already a foundation on the tile, or at least
    00281              * another slope that is not compatible with the new one. */
    00282             return 0;
    00283           }
    00284           /* If the start is in the low part, it is automatically
    00285            * building the second part too. */
    00286           return ((start_roadbits & (ROAD_NE | ROAD_SE)) && !(existing_roadbits & (ROAD_SW | ROAD_NW))) ? 2 : 1;
    00287
    00288         default:
    00289           /* Roadbits causing a foundation are going to be build.
    00290            * When the existing roadbits are slopes (the lower bits
    00291            * are used), this cannot be done. */
    00292           if ((existing_roadbits | new_roadbits) == new_roadbits) return 1;
    00293           return (existing_roadbits & (ROAD_NE | ROAD_SE)) ? 0 : 1;
    00294       }
    00295
    00296     case SLOPE_SW:
    00297       /* A slope similar to a SLOPE_SW. */
    00298       switch (new_roadbits) {
    00299         case  9: // ROAD_NE | ROAD_NW:
    00300         case 12: // ROAD_NE | ROAD_SE:
    00301           /* Cannot build anything with a turn from the low side. */
    00302           return 0;
    00303
    00304         case 10: // ROAD_NE | ROAD_SW:
    00305           /* A 'sloped' tile is going to be build. */
    00306           if ((existing_roadbits | new_roadbits) != new_roadbits) {
    00307             /* There is already a foundation on the tile, or at least
    00308              * another slope that is not compatible with the new one. */
    00309             return 0;
    00310           }
    00311           /* If the start is in the low part, it is automatically
    00312            * building the second part too. */
    00313           return ((start_roadbits & ROAD_NE) && !(existing_roadbits & ROAD_SW)) ? 2 : 1;
    00314
    00315         default:
    00316           /* Roadbits causing a foundation are going to be build.
    00317            * When the existing roadbits are slopes (the lower bits
    00318            * are used), this cannot be done. */
    00319           return (existing_roadbits & ROAD_NE) ? 0 : 1;
    00320       }
    00321
    00322     default:
    00323       NOT_REACHED();
    00324   }
    00325 }
    00326
    00337 static bool NormaliseTileOffset(int32 *tile)
    00338 {
    00339     if (*tile == 1 || *tile == -1) return true;
    00340     if (*tile == ::TileDiffXY(0, -1)) {
    00341       *tile = -2;
    00342       return true;
    00343     }
    00344     if (*tile == ::TileDiffXY(0, 1)) {
    00345       *tile = 2;
    00346       return true;
    00347     }
    00348     return false;
    00349 }
    00350
    00351 /* static */ int32 AIRoad::CanBuildConnectedRoadParts(AITile::Slope slope_, Array *existing, TileIndex start_, TileIndex end_)
    00352 {
    00353 	::Slope slope = (::Slope)slope_;
    00354   int32 start = start_;
    00355   int32 end = end_;
    00356
    00357   /* The start tile and end tile cannot be the same tile either. */
    00358   if (start == end) return -1;
    00359
    00360   for (int i = 0; i < existing->size; i++) {
    00361     if (!NormaliseTileOffset(&existing->array[i])) return -1;
    00362   }
    00363
    00364   if (!NormaliseTileOffset(&start)) return -1;
    00365   if (!NormaliseTileOffset(&end)) return -1;
    00366
    00367   /* Without build on slopes the characteristics are vastly different, so use
    00368    * a different helper function (one that is much simpler). */
    00369   return _settings_game.construction.build_on_slopes ? LookupWithBuildOnSlopes(slope, existing, start, end) : LookupWithoutBuildOnSlopes(slope, existing, start, end);
    00370 }
    00371
    00372 /* static */ int32 AIRoad::CanBuildConnectedRoadPartsHere(TileIndex tile, TileIndex start, TileIndex end)
    00373 {
    00374   if (!::IsValidTile(tile) || !::IsValidTile(start) || !::IsValidTile(end)) return -1;
    00375   if (::DistanceManhattan(tile, start) != 1 || ::DistanceManhattan(tile, end) != 1) return -1;
    00376
    00377   /*                                       ROAD_NW              ROAD_SW             ROAD_SE             ROAD_NE */
    00378   static const TileIndex neighbours[] = {::TileDiffXY(0, -1), ::TileDiffXY(1, 0), ::TileDiffXY(0, 1), ::TileDiffXY(-1, 0)};
    00379   Array *existing = (Array*)alloca(sizeof(Array) + lengthof(neighbours) * sizeof(int32));
    00380   existing->size = 0;
    00381
    00382 	::RoadBits rb = ::ROAD_NONE;
    00383   if (::IsNormalRoadTile(tile)) {
    00384     rb = ::GetAllRoadBits(tile);
    00385   } else {
    00386     for (::RoadType rt = ::ROADTYPE_BEGIN; rt < ::ROADTYPE_END; rt++) rb |= ::GetAnyRoadBits(tile, rt);
    00387   }
    00388   for (uint i = 0; i < lengthof(neighbours); i++) {
    00389     if (HasBit(rb, i)) existing->array[existing->size++] = neighbours[i];
    00390   }
    00391
    00392   return AIRoad::CanBuildConnectedRoadParts(AITile::GetSlope(tile), existing, start - tile, end - tile);
    00393 }
    00394
    00402 static bool NeighbourHasReachableRoad(::RoadTypes rts, TileIndex start_tile, DiagDirection neighbour)
    00403 {
    00404   TileIndex neighbour_tile = ::TileAddByDiagDir(start_tile, neighbour);
    00405   if ((rts & ::GetRoadTypes(neighbour_tile)) == 0) return false;
    00406
    00407   switch (::GetTileType(neighbour_tile)) {
    00408     case MP_ROAD:
    00409       return (::GetRoadTileType(neighbour_tile) != ROAD_TILE_DEPOT);
    00410
    00411     case MP_STATION:
    00412       if (::IsDriveThroughStopTile(neighbour_tile)) {
    00413         return (::DiagDirToAxis(neighbour) == ::DiagDirToAxis(::GetRoadStopDir(neighbour_tile)));
    00414       }
    00415       return false;
    00416
    00417     default:
    00418       return false;
    00419   }
    00420 }
    00421
    00422 /* static */ int32 AIRoad::GetNeighbourRoadCount(TileIndex tile)
    00423 {
    00424   if (!::IsValidTile(tile)) return false;
    00425   if (!IsRoadTypeAvailable(GetCurrentRoadType())) return false;
    00426
    00427 	::RoadTypes rts = ::RoadTypeToRoadTypes((::RoadType)GetCurrentRoadType());
    00428   int32 neighbour = 0;
    00429
    00430   if (TileX(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NE)) neighbour++;
    00431   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SE)) neighbour++;
    00432   if (NeighbourHasReachableRoad(rts, tile, DIAGDIR_SW)) neighbour++;
    00433   if (TileY(tile) > 0 && NeighbourHasReachableRoad(rts, tile, DIAGDIR_NW)) neighbour++;
    00434
    00435   return neighbour;
    00436 }
    00437
    00438 /* static */ TileIndex AIRoad::GetRoadDepotFrontTile(TileIndex depot)
    00439 {
    00440   if (!IsRoadDepotTile(depot)) return INVALID_TILE;
    00441
    00442   return depot + ::TileOffsByDiagDir(::GetRoadDepotDirection(depot));
    00443 }
    00444
    00445 /* static */ TileIndex AIRoad::GetRoadStationFrontTile(TileIndex station)
    00446 {
    00447   if (!IsRoadStationTile(station)) return INVALID_TILE;
    00448
    00449   return station + ::TileOffsByDiagDir(::GetRoadStopDir(station));
    00450 }
    00451
    00452 /* static */ TileIndex AIRoad::GetDriveThroughBackTile(TileIndex station)
    00453 {
    00454   if (!IsDriveThroughRoadStationTile(station)) return INVALID_TILE;
    00455
    00456   return station + ::TileOffsByDiagDir(::ReverseDiagDir(::GetRoadStopDir(station)));
    00457 }
    00458
    00459 /* static */ bool AIRoad::_BuildRoadInternal(TileIndex start, TileIndex end, bool one_way, bool full)
    00460 {
    00461   EnforcePrecondition(false, start != end);
    00462   EnforcePrecondition(false, ::IsValidTile(start));
    00463   EnforcePrecondition(false, ::IsValidTile(end));
    00464   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
    00465   EnforcePrecondition(false, !one_way || AIObject::GetRoadType() == ::ROADTYPE_ROAD);
    00466   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
    00467
    00468   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);
    00469 }
    00470
    00471 /* static */ bool AIRoad::BuildRoad(TileIndex start, TileIndex end)
    00472 {
    00473   return _BuildRoadInternal(start, end, false, false);
    00474 }
    00475
    00476 /* static */ bool AIRoad::BuildOneWayRoad(TileIndex start, TileIndex end)
    00477 {
    00478   return _BuildRoadInternal(start, end, true, false);
    00479 }
    00480
    00481 /* static */ bool AIRoad::BuildRoadFull(TileIndex start, TileIndex end)
    00482 {
    00483   return _BuildRoadInternal(start, end, false, true);
    00484 }
    00485
    00486 /* static */ bool AIRoad::BuildOneWayRoadFull(TileIndex start, TileIndex end)
    00487 {
    00488   return _BuildRoadInternal(start, end, true, true);
    00489 }
    00490
    00491 /* static */ bool AIRoad::BuildRoadDepot(TileIndex tile, TileIndex front)
    00492 {
    00493   EnforcePrecondition(false, tile != front);
    00494   EnforcePrecondition(false, ::IsValidTile(tile));
    00495   EnforcePrecondition(false, ::IsValidTile(front));
    00496   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
    00497   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
    00498
    00499   uint entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
    00500
    00501   return AIObject::DoCommand(tile, entrance_dir | (AIObject::GetRoadType() << 2), 0, CMD_BUILD_ROAD_DEPOT);
    00502 }
    00503
    00504 /* static */ bool AIRoad::_BuildRoadStationInternal(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, bool drive_through, StationID station_id)
    00505 {
    00506   EnforcePrecondition(false, tile != front);
    00507   EnforcePrecondition(false, ::IsValidTile(tile));
    00508   EnforcePrecondition(false, ::IsValidTile(front));
    00509   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
    00510   EnforcePrecondition(false, station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id));
    00511   EnforcePrecondition(false, road_veh_type == ROADVEHTYPE_BUS || road_veh_type == ROADVEHTYPE_TRUCK);
    00512   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
    00513
    00514   uint entrance_dir;
    00515   if (drive_through) {
    00516     entrance_dir = ::TileY(tile) != ::TileY(front);
    00517   } else {
    00518     entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
    00519   }
    00520
    00521   uint p2 = station_id == AIStation::STATION_JOIN_ADJACENT ? 0 : 32;
    00522   p2 |= drive_through ? 2 : 0;
    00523   p2 |= road_veh_type == ROADVEHTYPE_TRUCK ? 1 : 0;
    00524   p2 |= ::RoadTypeToRoadTypes(AIObject::GetRoadType()) << 2;
    00525   p2 |= (AIStation::IsValidStation(station_id) ? station_id : INVALID_STATION) << 16;
    00526   return AIObject::DoCommand(tile, entrance_dir, p2, CMD_BUILD_ROAD_STOP);
    00527 }
    00528
    00529 /* static */ bool AIRoad::BuildRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
    00530 {
    00531   return _BuildRoadStationInternal(tile, front, road_veh_type, false, station_id);
    00532 }
    00533
    00534 /* static */ bool AIRoad::BuildDriveThroughRoadStation(TileIndex tile, TileIndex front, RoadVehicleType road_veh_type, StationID station_id)
    00535 {
    00536   return _BuildRoadStationInternal(tile, front, road_veh_type, true, station_id);
    00537 }
    00538
    00539 /* static */ bool AIRoad::RemoveRoad(TileIndex start, TileIndex end)
    00540 {
    00541   EnforcePrecondition(false, ::IsValidTile(start));
    00542   EnforcePrecondition(false, ::IsValidTile(end));
    00543   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
    00544   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
    00545
    00546   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 1 : 2) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
    00547 }
    00548
    00549 /* static */ bool AIRoad::RemoveRoadFull(TileIndex start, TileIndex end)
    00550 {
    00551   EnforcePrecondition(false, ::IsValidTile(start));
    00552   EnforcePrecondition(false, ::IsValidTile(end));
    00553   EnforcePrecondition(false, ::TileX(start) == ::TileX(end) || ::TileY(start) == ::TileY(end));
    00554   EnforcePrecondition(false, IsRoadTypeAvailable(GetCurrentRoadType()));
    00555
    00556   return AIObject::DoCommand(end, start, (::TileY(start) != ::TileY(end) ? 4 : 0) | (start < end ? 2 : 1) | (AIObject::GetRoadType() << 3), CMD_REMOVE_LONG_ROAD);
    00557 }
    00558
    00559 /* static */ bool AIRoad::RemoveRoadDepot(TileIndex tile)
    00560 {
    00561   EnforcePrecondition(false, ::IsValidTile(tile));
    00562   EnforcePrecondition(false, IsTileType(tile, MP_ROAD))
    00563   EnforcePrecondition(false, GetRoadTileType(tile) == ROAD_TILE_DEPOT);
    00564
    00565   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
    00566 }
    00567
    00568 /* static */ bool AIRoad::RemoveRoadStation(TileIndex tile)
    00569 {
    00570   EnforcePrecondition(false, ::IsValidTile(tile));
    00571   EnforcePrecondition(false, IsTileType(tile, MP_STATION));
    00572   EnforcePrecondition(false, IsRoadStop(tile));
    00573
    00574   return AIObject::DoCommand(tile, 0, GetRoadStopType(tile), CMD_REMOVE_ROAD_STOP);
    00575 }