ai_rail.cpp

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00001 /* $Id: ai_rail.cpp 20632 2010-08-26 22:01:16Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "ai_rail.hpp"
00013 #include "ai_map.hpp"
00014 #include "ai_station.hpp"
00015 #include "ai_industrytype.hpp"
00016 #include "../../debug.h"
00017 #include "../../station_base.h"
00018 #include "../../company_func.h"
00019 #include "../../newgrf.h"
00020 #include "../../newgrf_generic.h"
00021 #include "../../newgrf_station.h"
00022 
00023 /* static */ bool AIRail::IsRailTile(TileIndex tile)
00024 {
00025   if (!::IsValidTile(tile)) return false;
00026 
00027   return (::IsTileType(tile, MP_RAILWAY) && !::IsRailDepot(tile)) ||
00028       (::HasStationTileRail(tile) && !::IsStationTileBlocked(tile)) || ::IsLevelCrossingTile(tile);
00029 }
00030 
00031 /* static */ bool AIRail::IsLevelCrossingTile(TileIndex tile)
00032 {
00033   if (!::IsValidTile(tile)) return false;
00034 
00035   return ::IsLevelCrossingTile(tile);
00036 }
00037 
00038 /* static */ bool AIRail::IsRailDepotTile(TileIndex tile)
00039 {
00040   if (!::IsValidTile(tile)) return false;
00041 
00042   return ::IsRailDepotTile(tile);
00043 }
00044 
00045 /* static */ bool AIRail::IsRailStationTile(TileIndex tile)
00046 {
00047   if (!::IsValidTile(tile)) return false;
00048 
00049   return ::IsRailStationTile(tile);
00050 }
00051 
00052 /* static */ bool AIRail::IsRailWaypointTile(TileIndex tile)
00053 {
00054   if (!::IsValidTile(tile)) return false;
00055 
00056   return ::IsRailWaypointTile(tile);
00057 }
00058 
00059 /* static */ bool AIRail::IsRailTypeAvailable(RailType rail_type)
00060 {
00061   if ((::RailType)rail_type < RAILTYPE_BEGIN || (::RailType)rail_type >= RAILTYPE_END) return false;
00062 
00063   return ::HasRailtypeAvail(_current_company, (::RailType)rail_type);
00064 }
00065 
00066 /* static */ AIRail::RailType AIRail::GetCurrentRailType()
00067 {
00068   return (RailType)AIObject::GetRailType();
00069 }
00070 
00071 /* static */ void AIRail::SetCurrentRailType(RailType rail_type)
00072 {
00073   if (!IsRailTypeAvailable(rail_type)) return;
00074 
00075   AIObject::SetRailType((::RailType)rail_type);
00076 }
00077 
00078 /* static */ bool AIRail::TrainCanRunOnRail(AIRail::RailType engine_rail_type, AIRail::RailType track_rail_type)
00079 {
00080   if (!AIRail::IsRailTypeAvailable(engine_rail_type)) return false;
00081   if (!AIRail::IsRailTypeAvailable(track_rail_type)) return false;
00082 
00083   return ::IsCompatibleRail((::RailType)engine_rail_type, (::RailType)track_rail_type);
00084 }
00085 
00086 /* static */ bool AIRail::TrainHasPowerOnRail(AIRail::RailType engine_rail_type, AIRail::RailType track_rail_type)
00087 {\
00088   if (!AIRail::IsRailTypeAvailable(engine_rail_type)) return false;
00089   if (!AIRail::IsRailTypeAvailable(track_rail_type)) return false;
00090 
00091   return ::HasPowerOnRail((::RailType)engine_rail_type, (::RailType)track_rail_type);
00092 }
00093 
00094 /* static */ AIRail::RailType AIRail::GetRailType(TileIndex tile)
00095 {
00096   if (!AITile::HasTransportType(tile, AITile::TRANSPORT_RAIL)) return RAILTYPE_INVALID;
00097 
00098   return (RailType)::GetRailType(tile);
00099 }
00100 
00101 /* static */ bool AIRail::ConvertRailType(TileIndex start_tile, TileIndex end_tile, AIRail::RailType convert_to)
00102 {
00103   EnforcePrecondition(false, ::IsValidTile(start_tile));
00104   EnforcePrecondition(false, ::IsValidTile(end_tile));
00105   EnforcePrecondition(false, IsRailTypeAvailable(convert_to));
00106 
00107   return AIObject::DoCommand(start_tile, end_tile, convert_to, CMD_CONVERT_RAIL);
00108 }
00109 
00110 /* static */ TileIndex AIRail::GetRailDepotFrontTile(TileIndex depot)
00111 {
00112   if (!IsRailDepotTile(depot)) return INVALID_TILE;
00113 
00114   return depot + ::TileOffsByDiagDir(::GetRailDepotDirection(depot));
00115 }
00116 
00117 /* static */ AIRail::RailTrack AIRail::GetRailStationDirection(TileIndex tile)
00118 {
00119   if (!IsRailStationTile(tile)) return RAILTRACK_INVALID;
00120 
00121   return (RailTrack)::GetRailStationTrackBits(tile);
00122 }
00123 
00124 /* static */ bool AIRail::BuildRailDepot(TileIndex tile, TileIndex front)
00125 {
00126   EnforcePrecondition(false, tile != front);
00127   EnforcePrecondition(false, ::IsValidTile(tile));
00128   EnforcePrecondition(false, ::IsValidTile(front));
00129   EnforcePrecondition(false, ::TileX(tile) == ::TileX(front) || ::TileY(tile) == ::TileY(front));
00130   EnforcePrecondition(false, IsRailTypeAvailable(GetCurrentRailType()));
00131 
00132   uint entrance_dir = (::TileX(tile) == ::TileX(front)) ? (::TileY(tile) < ::TileY(front) ? 1 : 3) : (::TileX(tile) < ::TileX(front) ? 2 : 0);
00133 
00134   return AIObject::DoCommand(tile, AIObject::GetRailType(), entrance_dir, CMD_BUILD_TRAIN_DEPOT);
00135 }
00136 
00137 /* static */ bool AIRail::BuildRailStation(TileIndex tile, RailTrack direction, uint num_platforms, uint platform_length, StationID station_id)
00138 {
00139   EnforcePrecondition(false, ::IsValidTile(tile));
00140   EnforcePrecondition(false, direction == RAILTRACK_NW_SE || direction == RAILTRACK_NE_SW);
00141   EnforcePrecondition(false, num_platforms > 0 && num_platforms <= 0xFF);
00142   EnforcePrecondition(false, platform_length > 0 && platform_length <= 0xFF);
00143   EnforcePrecondition(false, IsRailTypeAvailable(GetCurrentRailType()));
00144   EnforcePrecondition(false, station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id));
00145 
00146   uint32 p1 = GetCurrentRailType() | (platform_length << 16) | (num_platforms << 8);
00147   if (direction == RAILTRACK_NW_SE) p1 |= (1 << 4);
00148   if (station_id != AIStation::STATION_JOIN_ADJACENT) p1 |= (1 << 24);
00149   return AIObject::DoCommand(tile, p1, (AIStation::IsValidStation(station_id) ? station_id : INVALID_STATION) << 16, CMD_BUILD_RAIL_STATION);
00150 }
00151 
00152 /* static */ bool AIRail::BuildNewGRFRailStation(TileIndex tile, RailTrack direction, uint num_platforms, uint platform_length, StationID station_id, CargoID cargo_id, IndustryType source_industry, IndustryType goal_industry, int distance, bool source_station)
00153 {
00154   EnforcePrecondition(false, ::IsValidTile(tile));
00155   EnforcePrecondition(false, direction == RAILTRACK_NW_SE || direction == RAILTRACK_NE_SW);
00156   EnforcePrecondition(false, num_platforms > 0 && num_platforms <= 0xFF);
00157   EnforcePrecondition(false, platform_length > 0 && platform_length <= 0xFF);
00158   EnforcePrecondition(false, IsRailTypeAvailable(GetCurrentRailType()));
00159   EnforcePrecondition(false, station_id == AIStation::STATION_NEW || station_id == AIStation::STATION_JOIN_ADJACENT || AIStation::IsValidStation(station_id));
00160   EnforcePrecondition(false, source_industry == AIIndustryType::INDUSTRYTYPE_UNKNOWN || source_industry == AIIndustryType::INDUSTRYTYPE_TOWN || AIIndustryType::IsValidIndustryType(source_industry));
00161   EnforcePrecondition(false, goal_industry   == AIIndustryType::INDUSTRYTYPE_UNKNOWN || goal_industry   == AIIndustryType::INDUSTRYTYPE_TOWN || AIIndustryType::IsValidIndustryType(goal_industry));
00162 
00163   uint32 p1 = GetCurrentRailType() | (platform_length << 16) | (num_platforms << 8);
00164   if (direction == RAILTRACK_NW_SE) p1 |= 1 << 4;
00165   if (station_id != AIStation::STATION_JOIN_ADJACENT) p1 |= (1 << 24);
00166 
00167   const GRFFile *file;
00168   uint16 res = GetAiPurchaseCallbackResult(GSF_STATIONS, cargo_id, 0, source_industry, goal_industry, min(255, distance / 2), AICE_STATION_GET_STATION_ID, source_station ? 0 : 1, min(15, num_platforms) << 4 | min(15, platform_length), &file);
00169   uint32 p2 = (AIStation::IsValidStation(station_id) ? station_id : INVALID_STATION) << 16;
00170   if (res != CALLBACK_FAILED) {
00171     int index = 0;
00172     const StationSpec *spec = StationClass::GetByGrf(file->grfid, res, &index);
00173     if (spec == NULL) {
00174       DEBUG(grf, 1, "%s returned an invalid station ID for 'AI construction/purchase selection (18)' callback", file->filename);
00175     } else {
00176       p2 |= spec->cls_id | index << 8;
00177     }
00178 
00179   }
00180   return AIObject::DoCommand(tile, p1, p2, CMD_BUILD_RAIL_STATION);
00181 }
00182 
00183 /* static */ bool AIRail::BuildRailWaypoint(TileIndex tile)
00184 {
00185   EnforcePrecondition(false, ::IsValidTile(tile));
00186   EnforcePrecondition(false, IsRailTile(tile));
00187   EnforcePrecondition(false, GetRailTracks(tile) == RAILTRACK_NE_SW || GetRailTracks(tile) == RAILTRACK_NW_SE);
00188   EnforcePrecondition(false, IsRailTypeAvailable(GetCurrentRailType()));
00189 
00190   return AIObject::DoCommand(tile, GetCurrentRailType() | (GetRailTracks(tile) == RAILTRACK_NE_SW ? AXIS_X : AXIS_Y) << 4 | 1 << 8 | 1 << 16, STAT_CLASS_WAYP | INVALID_STATION << 16, CMD_BUILD_RAIL_WAYPOINT);
00191 }
00192 
00193 /* static */ bool AIRail::RemoveRailWaypointTileRectangle(TileIndex tile, TileIndex tile2, bool keep_rail)
00194 {
00195   EnforcePrecondition(false, ::IsValidTile(tile));
00196   EnforcePrecondition(false, ::IsValidTile(tile2));
00197 
00198   return AIObject::DoCommand(tile, tile2, keep_rail ? 1 : 0, CMD_REMOVE_FROM_RAIL_WAYPOINT);
00199 }
00200 
00201 /* static */ bool AIRail::RemoveRailStationTileRectangle(TileIndex tile, TileIndex tile2, bool keep_rail)
00202 {
00203   EnforcePrecondition(false, ::IsValidTile(tile));
00204   EnforcePrecondition(false, ::IsValidTile(tile2));
00205 
00206   return AIObject::DoCommand(tile, tile2, keep_rail ? 1 : 0, CMD_REMOVE_FROM_RAIL_STATION);
00207 }
00208 
00209 /* static */ uint AIRail::GetRailTracks(TileIndex tile)
00210 {
00211   if (!IsRailTile(tile)) return RAILTRACK_INVALID;
00212 
00213   if (IsRailStationTile(tile) || IsRailWaypointTile(tile)) return ::TrackToTrackBits(::GetRailStationTrack(tile));
00214   if (IsLevelCrossingTile(tile)) return ::GetCrossingRailBits(tile);
00215   if (IsRailDepotTile(tile)) return ::TRACK_BIT_NONE;
00216   return ::GetTrackBits(tile);
00217 }
00218 
00219 /* static */ bool AIRail::BuildRailTrack(TileIndex tile, RailTrack rail_track)
00220 {
00221   EnforcePrecondition(false, ::IsValidTile(tile));
00222   EnforcePrecondition(false, rail_track != 0);
00223   EnforcePrecondition(false, (rail_track & ~::TRACK_BIT_ALL) == 0);
00224   EnforcePrecondition(false, KillFirstBit((uint)rail_track) == 0);
00225   EnforcePrecondition(false, IsRailTypeAvailable(GetCurrentRailType()));
00226 
00227   return AIObject::DoCommand(tile, tile, GetCurrentRailType() | (FindFirstTrack((::TrackBits)rail_track) << 4), CMD_BUILD_RAILROAD_TRACK);
00228 }
00229 
00230 /* static */ bool AIRail::RemoveRailTrack(TileIndex tile, RailTrack rail_track)
00231 {
00232   EnforcePrecondition(false, ::IsValidTile(tile));
00233   EnforcePrecondition(false, ::IsPlainRailTile(tile) || ::IsLevelCrossingTile(tile));
00234   EnforcePrecondition(false, GetRailTracks(tile) & rail_track);
00235   EnforcePrecondition(false, KillFirstBit((uint)rail_track) == 0);
00236 
00237   return AIObject::DoCommand(tile, tile, GetCurrentRailType() | (FindFirstTrack((::TrackBits)rail_track) << 4), CMD_REMOVE_RAILROAD_TRACK);
00238 }
00239 
00240 /* static */ bool AIRail::AreTilesConnected(TileIndex from, TileIndex tile, TileIndex to)
00241 {
00242   if (!IsRailTile(tile)) return false;
00243   if (from == to || AIMap::DistanceManhattan(from, tile) != 1 || AIMap::DistanceManhattan(tile, to) != 1) return false;
00244 
00245   if (to < from) ::Swap(from, to);
00246 
00247   if (tile - from == 1) {
00248     if (to - tile == 1) return (GetRailTracks(tile) & RAILTRACK_NE_SW) != 0;
00249     if (to - tile == ::MapSizeX()) return (GetRailTracks(tile) & RAILTRACK_NE_SE) != 0;
00250   } else if (tile - from == ::MapSizeX()) {
00251     if (tile - to == 1) return (GetRailTracks(tile) & RAILTRACK_NW_NE) != 0;
00252     if (to - tile == 1) return (GetRailTracks(tile) & RAILTRACK_NW_SW) != 0;
00253     if (to - tile == ::MapSizeX()) return (GetRailTracks(tile) & RAILTRACK_NW_SE) != 0;
00254   } else {
00255     return (GetRailTracks(tile) & RAILTRACK_SW_SE) != 0;
00256   }
00257 
00258   NOT_REACHED();
00259 }
00260 
00265 static uint32 SimulateDrag(TileIndex from, TileIndex tile, TileIndex *to)
00266 {
00267   int diag_offset = abs(abs((int)::TileX(*to) - (int)::TileX(tile)) - abs((int)::TileY(*to) - (int)::TileY(tile)));
00268   uint32 p2 = AIRail::GetCurrentRailType();
00269   if (::TileY(from) == ::TileY(*to)) {
00270     p2 |= (TRACK_X << 4);
00271     *to -= Clamp((int)::TileX(*to) - (int)::TileX(tile), -1, 1);
00272   } else if (::TileX(from) == ::TileX(*to)) {
00273     p2 |= (TRACK_Y << 4);
00274     *to -= ::MapSizeX() * Clamp((int)::TileY(*to) - (int)::TileY(tile), -1, 1);
00275   } else if (::TileY(from) < ::TileY(tile)) {
00276     if (::TileX(*to) < ::TileX(tile)) {
00277       p2 |= (TRACK_UPPER << 4);
00278     } else {
00279       p2 |= (TRACK_LEFT << 4);
00280     }
00281     if (diag_offset) {
00282       *to -= Clamp((int)::TileX(*to) - (int)::TileX(tile), -1, 1);
00283     } else {
00284       *to -= ::MapSizeX() * Clamp((int)::TileY(*to) - (int)::TileY(tile), -1, 1);
00285     }
00286   } else if (::TileY(from) > ::TileY(tile)) {
00287     if (::TileX(*to) < ::TileX(tile)) {
00288       p2 |= (TRACK_RIGHT << 4);
00289     } else {
00290       p2 |= (TRACK_LOWER << 4);
00291     }
00292     if (diag_offset) {
00293       *to -= Clamp((int)::TileX(*to) - (int)::TileX(tile), -1, 1);
00294     } else {
00295       *to -= ::MapSizeX() * Clamp((int)::TileY(*to) - (int)::TileY(tile), -1, 1);
00296     }
00297   } else if (::TileX(from) < ::TileX(tile)) {
00298     if (::TileY(*to) < ::TileY(tile)) {
00299       p2 |= (TRACK_UPPER << 4);
00300     } else {
00301       p2 |= (TRACK_RIGHT << 4);
00302     }
00303     if (!diag_offset) {
00304       *to -= Clamp((int)::TileX(*to) - (int)::TileX(tile), -1, 1);
00305     } else {
00306       *to -= ::MapSizeX() * Clamp((int)::TileY(*to) - (int)::TileY(tile), -1, 1);
00307     }
00308   } else if (::TileX(from) > ::TileX(tile)) {
00309     if (::TileY(*to) < ::TileY(tile)) {
00310       p2 |= (TRACK_LEFT << 4);
00311     } else {
00312       p2 |= (TRACK_LOWER << 4);
00313     }
00314     if (!diag_offset) {
00315       *to -= Clamp((int)::TileX(*to) - (int)::TileX(tile), -1, 1);
00316     } else {
00317       *to -= ::MapSizeX() * Clamp((int)::TileY(*to) - (int)::TileY(tile), -1, 1);
00318     }
00319   }
00320   return p2;
00321 }
00322 
00323 /* static */ bool AIRail::BuildRail(TileIndex from, TileIndex tile, TileIndex to)
00324 {
00325   EnforcePrecondition(false, ::IsValidTile(from));
00326   EnforcePrecondition(false, ::IsValidTile(tile));
00327   EnforcePrecondition(false, ::IsValidTile(to));
00328   EnforcePrecondition(false, ::DistanceManhattan(from, tile) == 1);
00329   EnforcePrecondition(false, ::DistanceManhattan(tile, to) >= 1);
00330   EnforcePrecondition(false, IsRailTypeAvailable(GetCurrentRailType()));
00331   int diag_offset = abs(abs((int)::TileX(to) - (int)::TileX(tile)) - abs((int)::TileY(to) - (int)::TileY(tile)));
00332   EnforcePrecondition(false, diag_offset <= 1 ||
00333       (::TileX(from) == ::TileX(tile) && ::TileX(tile) == ::TileX(to)) ||
00334       (::TileY(from) == ::TileY(tile) && ::TileY(tile) == ::TileY(to)));
00335 
00336   uint32 p2 = SimulateDrag(from, tile, &to) | 1 << 8;
00337   return AIObject::DoCommand(tile, to, p2, CMD_BUILD_RAILROAD_TRACK);
00338 }
00339 
00340 /* static */ bool AIRail::RemoveRail(TileIndex from, TileIndex tile, TileIndex to)
00341 {
00342   EnforcePrecondition(false, ::IsValidTile(from));
00343   EnforcePrecondition(false, ::IsValidTile(tile));
00344   EnforcePrecondition(false, ::IsValidTile(to));
00345   EnforcePrecondition(false, ::DistanceManhattan(from, tile) == 1);
00346   EnforcePrecondition(false, ::DistanceManhattan(tile, to) >= 1);
00347   int diag_offset = abs(abs((int)::TileX(to) - (int)::TileX(tile)) - abs((int)::TileY(to) - (int)::TileY(tile)));
00348   EnforcePrecondition(false, diag_offset <= 1 ||
00349       (::TileX(from) == ::TileX(tile) && ::TileX(tile) == ::TileX(to)) ||
00350       (::TileY(from) == ::TileY(tile) && ::TileY(tile) == ::TileY(to)));
00351 
00352   if (!IsRailTypeAvailable(GetCurrentRailType())) SetCurrentRailType(GetRailType(tile));
00353   uint32 p2 = SimulateDrag(from, tile, &to);
00354   return AIObject::DoCommand(tile, to, p2, CMD_REMOVE_RAILROAD_TRACK);
00355 }
00356 
00361 struct AIRailSignalData {
00362   Track track;        
00363   Trackdir trackdir;  
00364   uint signal_cycles; 
00365 };
00366 
00367 static const int NUM_TRACK_DIRECTIONS = 3; 
00368 
00375 static const AIRailSignalData _possible_trackdirs[5][NUM_TRACK_DIRECTIONS] = {
00376   {{TRACK_UPPER,   TRACKDIR_UPPER_E, 0}, {TRACK_Y,       TRACKDIR_Y_SE,    0}, {TRACK_LEFT,    TRACKDIR_LEFT_S,  1}},
00377   {{TRACK_RIGHT,   TRACKDIR_RIGHT_S, 1}, {TRACK_X,       TRACKDIR_X_SW,    1}, {TRACK_UPPER,   TRACKDIR_UPPER_W, 1}},
00378   {{INVALID_TRACK, INVALID_TRACKDIR, 0}, {INVALID_TRACK, INVALID_TRACKDIR, 0}, {INVALID_TRACK, INVALID_TRACKDIR, 0}},
00379   {{TRACK_LOWER,   TRACKDIR_LOWER_E, 0}, {TRACK_X,       TRACKDIR_X_NE,    0}, {TRACK_LEFT,    TRACKDIR_LEFT_N,  0}},
00380   {{TRACK_RIGHT,   TRACKDIR_RIGHT_N, 0}, {TRACK_Y,       TRACKDIR_Y_NW,    1}, {TRACK_LOWER,   TRACKDIR_LOWER_W, 1}}
00381 };
00382 
00383 /* static */ AIRail::SignalType AIRail::GetSignalType(TileIndex tile, TileIndex front)
00384 {
00385   if (AIMap::DistanceManhattan(tile, front) != 1) return SIGNALTYPE_NONE;
00386   if (!::IsTileType(tile, MP_RAILWAY) || !::HasSignals(tile)) return SIGNALTYPE_NONE;
00387 
00388   int data_index = 2 + (::TileX(front) - ::TileX(tile)) + 2 * (::TileY(front) - ::TileY(tile));
00389 
00390   for (int i = 0; i < NUM_TRACK_DIRECTIONS; i++) {
00391     const Track &track = _possible_trackdirs[data_index][i].track;
00392     if (!(::TrackToTrackBits(track) & GetRailTracks(tile))) continue;
00393     if (!HasSignalOnTrack(tile, track)) continue;
00394     if (!HasSignalOnTrackdir(tile, _possible_trackdirs[data_index][i].trackdir)) continue;
00395     SignalType st = (SignalType)::GetSignalType(tile, track);
00396     if (HasSignalOnTrackdir(tile, ::ReverseTrackdir(_possible_trackdirs[data_index][i].trackdir))) st = (SignalType)(st | SIGNALTYPE_TWOWAY);
00397     return st;
00398   }
00399 
00400   return SIGNALTYPE_NONE;
00401 }
00402 
00406 static bool IsValidSignalType(int signal_type)
00407 {
00408   if (signal_type < AIRail::SIGNALTYPE_NORMAL || signal_type > AIRail::SIGNALTYPE_COMBO_TWOWAY) return false;
00409   if (signal_type > AIRail::SIGNALTYPE_PBS_ONEWAY && signal_type < AIRail::SIGNALTYPE_NORMAL_TWOWAY) return false;
00410   return true;
00411 }
00412 
00413 /* static */ bool AIRail::BuildSignal(TileIndex tile, TileIndex front, SignalType signal)
00414 {
00415   EnforcePrecondition(false, AIMap::DistanceManhattan(tile, front) == 1)
00416   EnforcePrecondition(false, ::IsPlainRailTile(tile));
00417   EnforcePrecondition(false, ::IsValidSignalType(signal));
00418 
00419   Track track = INVALID_TRACK;
00420   uint signal_cycles;
00421 
00422   int data_index = 2 + (::TileX(front) - ::TileX(tile)) + 2 * (::TileY(front) - ::TileY(tile));
00423   for (int i = 0; i < NUM_TRACK_DIRECTIONS; i++) {
00424     const Track &t = _possible_trackdirs[data_index][i].track;
00425     if (!(::TrackToTrackBits(t) & GetRailTracks(tile))) continue;
00426     track = t;
00427     signal_cycles = _possible_trackdirs[data_index][i].signal_cycles;
00428     break;
00429   }
00430   EnforcePrecondition(false, track != INVALID_TRACK);
00431 
00432   uint p1 = track;
00433   if (signal < SIGNALTYPE_TWOWAY) {
00434     if (signal != SIGNALTYPE_PBS && signal != SIGNALTYPE_PBS_ONEWAY) signal_cycles++;
00435     p1 |= (signal_cycles << 15);
00436   }
00437   p1 |= ((signal >= SIGNALTYPE_TWOWAY ? signal ^ SIGNALTYPE_TWOWAY : signal) << 5);
00438 
00439   return AIObject::DoCommand(tile, p1, 0, CMD_BUILD_SIGNALS);
00440 }
00441 
00442 /* static */ bool AIRail::RemoveSignal(TileIndex tile, TileIndex front)
00443 {
00444   EnforcePrecondition(false, AIMap::DistanceManhattan(tile, front) == 1)
00445   EnforcePrecondition(false, GetSignalType(tile, front) != SIGNALTYPE_NONE);
00446 
00447   Track track = INVALID_TRACK;
00448   int data_index = 2 + (::TileX(front) - ::TileX(tile)) + 2 * (::TileY(front) - ::TileY(tile));
00449   for (int i = 0; i < NUM_TRACK_DIRECTIONS; i++) {
00450     const Track &t = _possible_trackdirs[data_index][i].track;
00451     if (!(::TrackToTrackBits(t) & GetRailTracks(tile))) continue;
00452     track = t;
00453     break;
00454   }
00455   EnforcePrecondition(false, track != INVALID_TRACK);
00456 
00457   return AIObject::DoCommand(tile, track, 0, CMD_REMOVE_SIGNALS);
00458 }
00459 
00460 /* static */ Money AIRail::GetBuildCost(RailType railtype, BuildType build_type)
00461 {
00462   if (!AIRail::IsRailTypeAvailable(railtype)) return -1;
00463 
00464   switch (build_type) {
00465     case BT_TRACK:    return ::RailBuildCost((::RailType)railtype);
00466     case BT_SIGNAL:   return ::GetPrice(PR_BUILD_SIGNALS, 1, NULL);
00467     case BT_DEPOT:    return ::GetPrice(PR_BUILD_DEPOT_TRAIN, 1, NULL);
00468     case BT_STATION:  return ::GetPrice(PR_BUILD_STATION_RAIL, 1, NULL) + ::GetPrice(PR_BUILD_STATION_RAIL_LENGTH, 1, NULL);
00469     case BT_WAYPOINT: return ::GetPrice(PR_BUILD_WAYPOINT_RAIL, 1, NULL);
00470     default: return -1;
00471   }
00472 }
00473 
00474 /* static */ int32 AIRail::GetMaxSpeed(RailType railtype)
00475 {
00476   if (!AIRail::IsRailTypeAvailable(railtype)) return -1;
00477 
00478   return ::GetRailTypeInfo((::RailType)railtype)->max_speed;
00479 }

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