# ai_bridge.cpp

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    00001 /* $Id: ai_bridge.cpp 18330 2009-11-28 20:35:25Z 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_bridge.hpp"
    00013 #include "ai_rail.hpp"
    00014 #include "../ai_instance.hpp"
    00015 #include "../../bridge_map.h"
    00016 #include "../../strings_func.h"
    00017 #include "../../economy_func.h"
    00018 #include "../../date_func.h"
    00019
    00020 /* static */ bool AIBridge::IsValidBridge(BridgeID bridge_id)
    00021 {
    00022   return bridge_id < MAX_BRIDGES && ::GetBridgeSpec(bridge_id)->avail_year <= _cur_year;
    00023 }
    00024
    00025 /* static */ bool AIBridge::IsBridgeTile(TileIndex tile)
    00026 {
    00027   if (!::IsValidTile(tile)) return false;
    00028   return ::IsBridgeTile(tile);
    00029 }
    00030
    00031 /* static */ BridgeID AIBridge::GetBridgeID(TileIndex tile)
    00032 {
    00033   if (!IsBridgeTile(tile)) return (BridgeID)-1;
    00034   return (BridgeID)::GetBridgeType(tile);
    00035 }
    00036
    00037 static void _DoCommandReturnBuildBridge2(class AIInstance *instance)
    00038 {
    00039   if (!AIBridge::_BuildBridgeRoad2()) {
    00040     AIInstance::DoCommandReturn(instance);
    00041     return;
    00042   }
    00043
    00044   /* This can never happen, as in test-mode this callback is never executed,
    00045    *  and in execute-mode, the other callback is called. */
    00046   NOT_REACHED();
    00047 }
    00048
    00049 static void _DoCommandReturnBuildBridge1(class AIInstance *instance)
    00050 {
    00051   if (!AIBridge::_BuildBridgeRoad1()) {
    00052     AIInstance::DoCommandReturn(instance);
    00053     return;
    00054   }
    00055
    00056   /* This can never happen, as in test-mode this callback is never executed,
    00057    *  and in execute-mode, the other callback is called. */
    00058   NOT_REACHED();
    00059 }
    00060
    00061 /* static */ bool AIBridge::BuildBridge(AIVehicle::VehicleType vehicle_type, BridgeID bridge_id, TileIndex start, TileIndex end)
    00062 {
    00063   EnforcePrecondition(false, start != end);
    00064   EnforcePrecondition(false, ::IsValidTile(start) && ::IsValidTile(end));
    00065   EnforcePrecondition(false, TileX(start) == TileX(end) || TileY(start) == TileY(end));
    00066   EnforcePrecondition(false, vehicle_type == AIVehicle::VT_ROAD || vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER);
    00067   EnforcePrecondition(false, vehicle_type != AIVehicle::VT_RAIL || AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType()));
    00068
    00069   uint type = 0;
    00070   switch (vehicle_type) {
    00071     case AIVehicle::VT_ROAD:
    00072       type |= (TRANSPORT_ROAD << 15);
    00073       type |= (::RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType()) << 8);
    00074       break;
    00075     case AIVehicle::VT_RAIL:
    00076       type |= (TRANSPORT_RAIL << 15);
    00077       type |= (AIRail::GetCurrentRailType() << 8);
    00078       break;
    00079     case AIVehicle::VT_WATER:
    00080       type |= (TRANSPORT_WATER << 15);
    00081       break;
    00082     default: NOT_REACHED();
    00083   }
    00084
    00085   /* For rail and water we do nothing special */
    00086   if (vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER) {
    00087     return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE);
    00088   }
    00089
    00090   AIObject::SetCallbackVariable(0, start);
    00091   AIObject::SetCallbackVariable(1, end);
    00092   return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE, NULL, &_DoCommandReturnBuildBridge1);
    00093 }
    00094
    00095 /* static */ bool AIBridge::_BuildBridgeRoad1()
    00096 {
    00097   /* Build the piece of road on the 'start' side of the bridge */
    00098   TileIndex end = AIObject::GetCallbackVariable(0);
    00099   TileIndex start = AIObject::GetCallbackVariable(1);
    00100
    00101   DiagDirection dir_1 = ::DiagdirBetweenTiles(end, start);
    00102   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
    00103
    00104   return AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD, NULL, &_DoCommandReturnBuildBridge2);
    00105 }
    00106
    00107 /* static */ bool AIBridge::_BuildBridgeRoad2()
    00108 {
    00109   /* Build the piece of road on the 'end' side of the bridge */
    00110   TileIndex end = AIObject::GetCallbackVariable(0);
    00111   TileIndex start = AIObject::GetCallbackVariable(1);
    00112
    00113   DiagDirection dir_1 = ::DiagdirBetweenTiles(end, start);
    00114   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
    00115
    00116   return AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
    00117 }
    00118
    00119 /* static */ bool AIBridge::RemoveBridge(TileIndex tile)
    00120 {
    00121   EnforcePrecondition(false, IsBridgeTile(tile));
    00122   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
    00123 }
    00124
    00125 /* static */ char *AIBridge::GetName(BridgeID bridge_id)
    00126 {
    00127   if (!IsValidBridge(bridge_id)) return NULL;
    00128
    00129   static const int len = 64;
    00130   char *bridge_name = MallocT<char>(len);
    00131
    00132   ::GetString(bridge_name, ::GetBridgeSpec(bridge_id)->transport_name[0], &bridge_name[len - 1]);
    00133   return bridge_name;
    00134 }
    00135
    00136 /* static */ int32 AIBridge::GetMaxSpeed(BridgeID bridge_id)
    00137 {
    00138   if (!IsValidBridge(bridge_id)) return -1;
    00139
    00140   return ::GetBridgeSpec(bridge_id)->speed; // km-ish/h
    00141 }
    00142
    00143 /* static */ Money AIBridge::GetPrice(BridgeID bridge_id, uint length)
    00144 {
    00145   if (!IsValidBridge(bridge_id)) return -1;
    00146
    00147   return ::CalcBridgeLenCostFactor(length) * _price[PR_BUILD_BRIDGE] * ::GetBridgeSpec(bridge_id)->price >> 8;
    00148 }
    00149
    00150 /* static */ int32 AIBridge::GetMaxLength(BridgeID bridge_id)
    00151 {
    00152   if (!IsValidBridge(bridge_id)) return -1;
    00153
    00154   uint max = ::GetBridgeSpec(bridge_id)->max_length;
    00155   if (max >= 16 && _settings_game.construction.longbridges) max = 100;
    00156   return max + 2;
    00157 }
    00158
    00159 /* static */ int32 AIBridge::GetMinLength(BridgeID bridge_id)
    00160 {
    00161   if (!IsValidBridge(bridge_id)) return -1;
    00162
    00163   return ::GetBridgeSpec(bridge_id)->min_length + 2;
    00164 }
    00165
    00166 /* static */ TileIndex AIBridge::GetOtherBridgeEnd(TileIndex tile)
    00167 {
    00168   if (!::IsValidTile(tile)) return INVALID_TILE;
    00169   if (!IsBridgeTile(tile)) return INVALID_TILE;
    00170
    00171   return ::GetOtherBridgeEnd(tile);
    00172 }