ai_bridge.cpp

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00001 /* $Id: ai_bridge.cpp 17080 2009-08-05 23:57:41Z rubidium $ */
00002 
00005 #include "ai_bridge.hpp"
00006 #include "ai_rail.hpp"
00007 #include "../ai_instance.hpp"
00008 #include "../../bridge_map.h"
00009 #include "../../strings_func.h"
00010 #include "../../core/alloc_func.hpp"
00011 #include "../../economy_func.h"
00012 #include "../../settings_type.h"
00013 #include "../../date_func.h"
00014 
00015 /* static */ bool AIBridge::IsValidBridge(BridgeID bridge_id)
00016 {
00017   return bridge_id < MAX_BRIDGES && ::GetBridgeSpec(bridge_id)->avail_year <= _cur_year;
00018 }
00019 
00020 /* static */ bool AIBridge::IsBridgeTile(TileIndex tile)
00021 {
00022   if (!::IsValidTile(tile)) return false;
00023   return ::IsBridgeTile(tile);
00024 }
00025 
00026 /* static */ BridgeID AIBridge::GetBridgeID(TileIndex tile)
00027 {
00028   if (!IsBridgeTile(tile)) return (BridgeID)-1;
00029   return (BridgeID)::GetBridgeType(tile);
00030 }
00031 
00032 static void _DoCommandReturnBuildBridge2(class AIInstance *instance)
00033 {
00034   if (!AIBridge::_BuildBridgeRoad2()) {
00035     AIInstance::DoCommandReturn(instance);
00036     return;
00037   }
00038 
00039   /* This can never happen, as in test-mode this callback is never executed,
00040    *  and in execute-mode, the other callback is called. */
00041   NOT_REACHED();
00042 }
00043 
00044 static void _DoCommandReturnBuildBridge1(class AIInstance *instance)
00045 {
00046   if (!AIBridge::_BuildBridgeRoad1()) {
00047     AIInstance::DoCommandReturn(instance);
00048     return;
00049   }
00050 
00051   /* This can never happen, as in test-mode this callback is never executed,
00052    *  and in execute-mode, the other callback is called. */
00053   NOT_REACHED();
00054 }
00055 
00056 /* static */ bool AIBridge::BuildBridge(AIVehicle::VehicleType vehicle_type, BridgeID bridge_id, TileIndex start, TileIndex end)
00057 {
00058   EnforcePrecondition(false, start != end);
00059   EnforcePrecondition(false, ::IsValidTile(start) && ::IsValidTile(end));
00060   EnforcePrecondition(false, TileX(start) == TileX(end) || TileY(start) == TileY(end));
00061   EnforcePrecondition(false, vehicle_type == AIVehicle::VT_ROAD || vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER);
00062   EnforcePrecondition(false, vehicle_type != AIVehicle::VT_RAIL || AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType()));
00063 
00064   uint type = 0;
00065   switch (vehicle_type) {
00066     case AIVehicle::VT_ROAD:
00067       type |= (TRANSPORT_ROAD << 15);
00068       type |= (::RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType()) << 8);
00069       break;
00070     case AIVehicle::VT_RAIL:
00071       type |= (TRANSPORT_RAIL << 15);
00072       type |= (AIRail::GetCurrentRailType() << 8);
00073       break;
00074     case AIVehicle::VT_WATER:
00075       type |= (TRANSPORT_WATER << 15);
00076       break;
00077     default: NOT_REACHED();
00078   }
00079 
00080   /* For rail and water we do nothing special */
00081   if (vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER) {
00082     return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE);
00083   }
00084 
00085   AIObject::SetCallbackVariable(0, start);
00086   AIObject::SetCallbackVariable(1, end);
00087   return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE, NULL, &_DoCommandReturnBuildBridge1);
00088 }
00089 
00090 /* static */ bool AIBridge::_BuildBridgeRoad1()
00091 {
00092   /* Build the piece of road on the 'start' side of the bridge */
00093   TileIndex end = AIObject::GetCallbackVariable(0);
00094   TileIndex start = AIObject::GetCallbackVariable(1);
00095 
00096   DiagDirection dir_1 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
00097   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
00098 
00099   return AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD, NULL, &_DoCommandReturnBuildBridge2);
00100 }
00101 
00102 /* static */ bool AIBridge::_BuildBridgeRoad2()
00103 {
00104   /* Build the piece of road on the 'end' side of the bridge */
00105   TileIndex end = AIObject::GetCallbackVariable(0);
00106   TileIndex start = AIObject::GetCallbackVariable(1);
00107 
00108   DiagDirection dir_1 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
00109   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
00110 
00111   return AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
00112 }
00113 
00114 /* static */ bool AIBridge::RemoveBridge(TileIndex tile)
00115 {
00116   EnforcePrecondition(false, IsBridgeTile(tile));
00117   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
00118 }
00119 
00120 /* static */ char *AIBridge::GetName(BridgeID bridge_id)
00121 {
00122   if (!IsValidBridge(bridge_id)) return NULL;
00123 
00124   static const int len = 64;
00125   char *bridge_name = MallocT<char>(len);
00126 
00127   ::GetString(bridge_name, ::GetBridgeSpec(bridge_id)->transport_name[0], &bridge_name[len - 1]);
00128   return bridge_name;
00129 }
00130 
00131 /* static */ int32 AIBridge::GetMaxSpeed(BridgeID bridge_id)
00132 {
00133   if (!IsValidBridge(bridge_id)) return -1;
00134 
00135   return ::GetBridgeSpec(bridge_id)->speed; // km-ish/h
00136 }
00137 
00138 /* static */ Money AIBridge::GetPrice(BridgeID bridge_id, uint length)
00139 {
00140   if (!IsValidBridge(bridge_id)) return -1;
00141 
00142   return ::CalcBridgeLenCostFactor(length) * _price.build_bridge * ::GetBridgeSpec(bridge_id)->price >> 8;
00143 }
00144 
00145 /* static */ int32 AIBridge::GetMaxLength(BridgeID bridge_id)
00146 {
00147   if (!IsValidBridge(bridge_id)) return -1;
00148 
00149   uint max = ::GetBridgeSpec(bridge_id)->max_length;
00150   if (max >= 16 && _settings_game.construction.longbridges) max = 100;
00151   return max + 2;
00152 }
00153 
00154 /* static */ int32 AIBridge::GetMinLength(BridgeID bridge_id)
00155 {
00156   if (!IsValidBridge(bridge_id)) return -1;
00157 
00158   return ::GetBridgeSpec(bridge_id)->min_length + 2;
00159 }
00160 
00161 /* static */ TileIndex AIBridge::GetOtherBridgeEnd(TileIndex tile)
00162 {
00163   if (!::IsValidTile(tile)) return INVALID_TILE;
00164   if (!IsBridgeTile(tile)) return INVALID_TILE;
00165 
00166   return ::GetOtherBridgeEnd(tile);
00167 }

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