ai_bridge.cpp

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00001 /* $Id$ */
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 "../../stdafx.h"
00013 #include "ai_bridge.hpp"
00014 #include "ai_rail.hpp"
00015 #include "../ai_instance.hpp"
00016 #include "../../bridge_map.h"
00017 #include "../../strings_func.h"
00018 #include "../../economy_func.h"
00019 #include "../../date_func.h"
00020 
00021 /* static */ bool AIBridge::IsValidBridge(BridgeID bridge_id)
00022 {
00023   return bridge_id < MAX_BRIDGES && ::GetBridgeSpec(bridge_id)->avail_year <= _cur_year;
00024 }
00025 
00026 /* static */ bool AIBridge::IsBridgeTile(TileIndex tile)
00027 {
00028   if (!::IsValidTile(tile)) return false;
00029   return ::IsBridgeTile(tile);
00030 }
00031 
00032 /* static */ BridgeID AIBridge::GetBridgeID(TileIndex tile)
00033 {
00034   if (!IsBridgeTile(tile)) return (BridgeID)-1;
00035   return (BridgeID)::GetBridgeType(tile);
00036 }
00037 
00042 static void _DoCommandReturnBuildBridge2(class AIInstance *instance)
00043 {
00044   if (!AIBridge::_BuildBridgeRoad2()) {
00045     AIInstance::DoCommandReturn(instance);
00046     return;
00047   }
00048 
00049   /* This can never happen, as in test-mode this callback is never executed,
00050    *  and in execute-mode, the other callback is called. */
00051   NOT_REACHED();
00052 }
00053 
00058 static void _DoCommandReturnBuildBridge1(class AIInstance *instance)
00059 {
00060   if (!AIBridge::_BuildBridgeRoad1()) {
00061     AIInstance::DoCommandReturn(instance);
00062     return;
00063   }
00064 
00065   /* This can never happen, as in test-mode this callback is never executed,
00066    *  and in execute-mode, the other callback is called. */
00067   NOT_REACHED();
00068 }
00069 
00070 /* static */ bool AIBridge::BuildBridge(AIVehicle::VehicleType vehicle_type, BridgeID bridge_id, TileIndex start, TileIndex end)
00071 {
00072   EnforcePrecondition(false, start != end);
00073   EnforcePrecondition(false, ::IsValidTile(start) && ::IsValidTile(end));
00074   EnforcePrecondition(false, TileX(start) == TileX(end) || TileY(start) == TileY(end));
00075   EnforcePrecondition(false, vehicle_type == AIVehicle::VT_ROAD || vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER);
00076   EnforcePrecondition(false, vehicle_type != AIVehicle::VT_RAIL || AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType()));
00077 
00078   uint type = 0;
00079   switch (vehicle_type) {
00080     case AIVehicle::VT_ROAD:
00081       type |= (TRANSPORT_ROAD << 15);
00082       type |= (::RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType()) << 8);
00083       break;
00084     case AIVehicle::VT_RAIL:
00085       type |= (TRANSPORT_RAIL << 15);
00086       type |= (AIRail::GetCurrentRailType() << 8);
00087       break;
00088     case AIVehicle::VT_WATER:
00089       type |= (TRANSPORT_WATER << 15);
00090       break;
00091     default: NOT_REACHED();
00092   }
00093 
00094   /* For rail and water we do nothing special */
00095   if (vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER) {
00096     return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE);
00097   }
00098 
00099   AIObject::SetCallbackVariable(0, start);
00100   AIObject::SetCallbackVariable(1, end);
00101   return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE, NULL, &::_DoCommandReturnBuildBridge1);
00102 }
00103 
00104 /* static */ bool AIBridge::_BuildBridgeRoad1()
00105 {
00106   /* Build the piece of road on the 'start' side of the bridge */
00107   TileIndex end = AIObject::GetCallbackVariable(0);
00108   TileIndex start = AIObject::GetCallbackVariable(1);
00109 
00110   DiagDirection dir_1 = ::DiagdirBetweenTiles(end, start);
00111   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
00112 
00113   return AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD, NULL, &::_DoCommandReturnBuildBridge2);
00114 }
00115 
00116 /* static */ bool AIBridge::_BuildBridgeRoad2()
00117 {
00118   /* Build the piece of road on the 'end' side of the bridge */
00119   TileIndex end = AIObject::GetCallbackVariable(0);
00120   TileIndex start = AIObject::GetCallbackVariable(1);
00121 
00122   DiagDirection dir_1 = ::DiagdirBetweenTiles(end, start);
00123   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
00124 
00125   return AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
00126 }
00127 
00128 /* static */ bool AIBridge::RemoveBridge(TileIndex tile)
00129 {
00130   EnforcePrecondition(false, IsBridgeTile(tile));
00131   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
00132 }
00133 
00134 /* static */ char *AIBridge::GetName(BridgeID bridge_id)
00135 {
00136   if (!IsValidBridge(bridge_id)) return NULL;
00137 
00138   static const int len = 64;
00139   char *bridge_name = MallocT<char>(len);
00140 
00141   ::GetString(bridge_name, ::GetBridgeSpec(bridge_id)->transport_name[0], &bridge_name[len - 1]);
00142   return bridge_name;
00143 }
00144 
00145 /* static */ int32 AIBridge::GetMaxSpeed(BridgeID bridge_id)
00146 {
00147   if (!IsValidBridge(bridge_id)) return -1;
00148 
00149   return ::GetBridgeSpec(bridge_id)->speed; // km-ish/h
00150 }
00151 
00152 /* static */ Money AIBridge::GetPrice(BridgeID bridge_id, uint length)
00153 {
00154   if (!IsValidBridge(bridge_id)) return -1;
00155 
00156   return ::CalcBridgeLenCostFactor(length) * _price[PR_BUILD_BRIDGE] * ::GetBridgeSpec(bridge_id)->price >> 8;
00157 }
00158 
00159 /* static */ int32 AIBridge::GetMaxLength(BridgeID bridge_id)
00160 {
00161   if (!IsValidBridge(bridge_id)) return -1;
00162 
00163   return min(::GetBridgeSpec(bridge_id)->max_length, _settings_game.construction.max_bridge_length) + 2;
00164 }
00165 
00166 /* static */ int32 AIBridge::GetMinLength(BridgeID bridge_id)
00167 {
00168   if (!IsValidBridge(bridge_id)) return -1;
00169 
00170   return ::GetBridgeSpec(bridge_id)->min_length + 2;
00171 }
00172 
00173 /* static */ TileIndex AIBridge::GetOtherBridgeEnd(TileIndex tile)
00174 {
00175   if (!::IsValidTile(tile)) return INVALID_TILE;
00176   if (!IsBridgeTile(tile)) return INVALID_TILE;
00177 
00178   return ::GetOtherBridgeEnd(tile);
00179 }

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