# ai_bridge.cpp

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    00001 /* $Id: ai_bridge.cpp 15912 2009-04-01 14:24:54Z 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     AIObject::SetLastCommandRes(false);
    00036     AIInstance::DoCommandReturn(instance);
    00037     return;
    00038   }
    00039
    00040   /* This can never happen, as in test-mode this callback is never executed,
    00041    *  and in execute-mode, the other callback is called. */
    00042   NOT_REACHED();
    00043 }
    00044
    00045 static void _DoCommandReturnBuildBridge1(class AIInstance *instance)
    00046 {
    00047   if (!AIBridge::_BuildBridgeRoad1()) {
    00048     AIObject::SetLastCommandRes(false);
    00049     AIInstance::DoCommandReturn(instance);
    00050     return;
    00051   }
    00052
    00053   /* This can never happen, as in test-mode this callback is never executed,
    00054    *  and in execute-mode, the other callback is called. */
    00055   NOT_REACHED();
    00056 }
    00057
    00058 /* static */ bool AIBridge::BuildBridge(AIVehicle::VehicleType vehicle_type, BridgeID bridge_id, TileIndex start, TileIndex end)
    00059 {
    00060   EnforcePrecondition(false, start != end);
    00061   EnforcePrecondition(false, ::IsValidTile(start) && ::IsValidTile(end));
    00062   EnforcePrecondition(false, TileX(start) == TileX(end) || TileY(start) == TileY(end));
    00063   EnforcePrecondition(false, vehicle_type == AIVehicle::VT_ROAD || vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER);
    00064   EnforcePrecondition(false, vehicle_type != AIVehicle::VT_RAIL || AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType()));
    00065
    00066   uint type = 0;
    00067   switch (vehicle_type) {
    00068     case AIVehicle::VT_ROAD:
    00069       type |= (TRANSPORT_ROAD << 15);
    00070       type |= (RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType()) << 8);
    00071       break;
    00072     case AIVehicle::VT_RAIL:
    00073       type |= (TRANSPORT_RAIL << 15);
    00074       type |= (AIRail::GetCurrentRailType() << 8);
    00075       break;
    00076     case AIVehicle::VT_WATER:
    00077       type |= (TRANSPORT_WATER << 15);
    00078       break;
    00079     default: NOT_REACHED();
    00080   }
    00081
    00082   /* For rail and water we do nothing special */
    00083   if (vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER) {
    00084     return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE);
    00085   }
    00086
    00087   AIObject::SetCallbackVariable(0, start);
    00088   AIObject::SetCallbackVariable(1, end);
    00089   if (!AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE, NULL, &_DoCommandReturnBuildBridge1)) return false;
    00090
    00091   /* In case of test-mode, test if we can build both road pieces */
    00092   return _BuildBridgeRoad1();
    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 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
    00102   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
    00103
    00104   if (!AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD, NULL, &_DoCommandReturnBuildBridge2)) return false;
    00105
    00106   /* In case of test-mode, test the other road piece too */
    00107   return _BuildBridgeRoad2();
    00108 }
    00109
    00110 /* static */ bool AIBridge::_BuildBridgeRoad2()
    00111 {
    00112   /* Build the piece of road on the 'end' side of the bridge */
    00113   TileIndex end = AIObject::GetCallbackVariable(0);
    00114   TileIndex start = AIObject::GetCallbackVariable(1);
    00115
    00116   DiagDirection dir_1 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
    00117   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
    00118
    00119   return AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
    00120 }
    00121
    00122 /* static */ bool AIBridge::RemoveBridge(TileIndex tile)
    00123 {
    00124   EnforcePrecondition(false, IsBridgeTile(tile));
    00125   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
    00126 }
    00127
    00128 /* static */ char *AIBridge::GetName(BridgeID bridge_id)
    00129 {
    00130   if (!IsValidBridge(bridge_id)) return NULL;
    00131
    00132   static const int len = 64;
    00133   char *bridge_name = MallocT<char>(len);
    00134
    00135   ::GetString(bridge_name, ::GetBridgeSpec(bridge_id)->transport_name[0], &bridge_name[len - 1]);
    00136   return bridge_name;
    00137 }
    00138
    00139 /* static */ int32 AIBridge::GetMaxSpeed(BridgeID bridge_id)
    00140 {
    00141   if (!IsValidBridge(bridge_id)) return -1;
    00142
    00143   return ::GetBridgeSpec(bridge_id)->speed; // km-ish/h
    00144 }
    00145
    00146 /* static */ Money AIBridge::GetPrice(BridgeID bridge_id, uint length)
    00147 {
    00148   if (!IsValidBridge(bridge_id)) return -1;
    00149
    00150   return length * _price.build_bridge * ::GetBridgeSpec(bridge_id)->price >> 8;
    00151 }
    00152
    00153 /* static */ int32 AIBridge::GetMaxLength(BridgeID bridge_id)
    00154 {
    00155   if (!IsValidBridge(bridge_id)) return -1;
    00156
    00157   uint max = ::GetBridgeSpec(bridge_id)->max_length;
    00158   if (max >= 16 && _settings_game.construction.longbridges) max = 100;
    00159   return max + 2;
    00160 }
    00161
    00162 /* static */ int32 AIBridge::GetMinLength(BridgeID bridge_id)
    00163 {
    00164   if (!IsValidBridge(bridge_id)) return -1;
    00165
    00166   return ::GetBridgeSpec(bridge_id)->min_length + 2;
    00167 }
    00168
    00169 /* static */ TileIndex AIBridge::GetOtherBridgeEnd(TileIndex tile)
    00170 {
    00171   if (!::IsValidTile(tile)) return INVALID_TILE;
    00172   if (!IsBridgeTile(tile)) return INVALID_TILE;
    00173
    00174   return ::GetOtherBridgeEnd(tile);
    00175 }