# ai_bridge.cpp

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    00001 /* $Id: ai_bridge.cpp 15490 2009-02-14 21:17:35Z yexo $ */
    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 void _DoCommandReturnBuildBridge2(class AIInstance *instance)
    00027 {
    00028   if (!AIBridge::_BuildBridgeRoad2()) {
    00029     AIObject::SetLastCommandRes(false);
    00030     AIInstance::DoCommandReturn(instance);
    00031     return;
    00032   }
    00033
    00034   /* This can never happen, as in test-mode this callback is never executed,
    00035   *  and in execute-mode, the other callback is called. */
    00036   NOT_REACHED();
    00037 }
    00038
    00039 static void _DoCommandReturnBuildBridge1(class AIInstance *instance)
    00040 {
    00041   if (!AIBridge::_BuildBridgeRoad1()) {
    00042     AIObject::SetLastCommandRes(false);
    00043     AIInstance::DoCommandReturn(instance);
    00044     return;
    00045   }
    00046
    00047   /* This can never happen, as in test-mode this callback is never executed,
    00048   *  and in execute-mode, the other callback is called. */
    00049   NOT_REACHED();
    00050 }
    00051
    00052 /* static */ bool AIBridge::BuildBridge(AIVehicle::VehicleType vehicle_type, BridgeID bridge_id, TileIndex start, TileIndex end)
    00053 {
    00054   EnforcePrecondition(false, start != end);
    00055   EnforcePrecondition(false, ::IsValidTile(start) && ::IsValidTile(end));
    00056   EnforcePrecondition(false, TileX(start) == TileX(end) || TileY(start) == TileY(end));
    00057   EnforcePrecondition(false, vehicle_type == AIVehicle::VT_ROAD || vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER);
    00058   EnforcePrecondition(false, vehicle_type != AIVehicle::VT_RAIL || AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType()));
    00059
    00060   uint type = 0;
    00061   switch (vehicle_type) {
    00062     case AIVehicle::VT_ROAD:
    00063       type |= (TRANSPORT_ROAD << 15);
    00064       type |= (RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType()) << 8);
    00065       break;
    00066     case AIVehicle::VT_RAIL:
    00067       type |= (TRANSPORT_RAIL << 15);
    00068       type |= (AIRail::GetCurrentRailType() << 8);
    00069       break;
    00070     case AIVehicle::VT_WATER:
    00071       type |= (TRANSPORT_WATER << 15);
    00072       break;
    00073     default: NOT_REACHED();
    00074   }
    00075
    00076   /* For rail and water we do nothing special */
    00077   if (vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER) {
    00078     return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE);
    00079   }
    00080
    00081   AIObject::SetCallbackVariable(0, start);
    00082   AIObject::SetCallbackVariable(1, end);
    00083   if (!AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE, NULL, &_DoCommandReturnBuildBridge1)) return false;
    00084
    00085   /* In case of test-mode, test if we can build both road pieces */
    00086   return _BuildBridgeRoad1();
    00087 }
    00088
    00089 /* static */ bool AIBridge::_BuildBridgeRoad1()
    00090 {
    00091   /* Build the piece of road on the 'start' side of the bridge */
    00092   TileIndex end = AIObject::GetCallbackVariable(0);
    00093   TileIndex start = AIObject::GetCallbackVariable(1);
    00094
    00095   DiagDirection dir_1 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
    00096   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
    00097
    00098   if (!AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD, NULL, &_DoCommandReturnBuildBridge2)) return false;
    00099
    00100   /* In case of test-mode, test the other road piece too */
    00101   return _BuildBridgeRoad2();
    00102 }
    00103
    00104 /* static */ bool AIBridge::_BuildBridgeRoad2()
    00105 {
    00106   /* Build the piece of road on the 'end' side of the bridge */
    00107   TileIndex end = AIObject::GetCallbackVariable(0);
    00108   TileIndex start = AIObject::GetCallbackVariable(1);
    00109
    00110   DiagDirection dir_1 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
    00111   DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
    00112
    00113   return AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
    00114 }
    00115
    00116 /* static */ bool AIBridge::RemoveBridge(TileIndex tile)
    00117 {
    00118   EnforcePrecondition(false, IsBridgeTile(tile));
    00119   return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
    00120 }
    00121
    00122 /* static */ char *AIBridge::GetName(BridgeID bridge_id)
    00123 {
    00124   if (!IsValidBridge(bridge_id)) return NULL;
    00125
    00126   static const int len = 64;
    00127   char *bridge_name = MallocT<char>(len);
    00128
    00129   ::GetString(bridge_name, ::GetBridgeSpec(bridge_id)->transport_name[0], &bridge_name[len - 1]);
    00130   return bridge_name;
    00131 }
    00132
    00133 /* static */ int32 AIBridge::GetMaxSpeed(BridgeID bridge_id)
    00134 {
    00135   if (!IsValidBridge(bridge_id)) return -1;
    00136
    00137   return ::GetBridgeSpec(bridge_id)->speed; // km-ish/h
    00138 }
    00139
    00140 /* static */ Money AIBridge::GetPrice(BridgeID bridge_id, uint length)
    00141 {
    00142   if (!IsValidBridge(bridge_id)) return -1;
    00143
    00144   return length * _price.build_bridge * ::GetBridgeSpec(bridge_id)->price >> 8;
    00145 }
    00146
    00147 /* static */ int32 AIBridge::GetMaxLength(BridgeID bridge_id)
    00148 {
    00149   if (!IsValidBridge(bridge_id)) return -1;
    00150
    00151   uint max = ::GetBridgeSpec(bridge_id)->max_length;
    00152   if (max >= 16 && _settings_game.construction.longbridges) max = 100;
    00153   return max + 2;
    00154 }
    00155
    00156 /* static */ int32 AIBridge::GetMinLength(BridgeID bridge_id)
    00157 {
    00158   if (!IsValidBridge(bridge_id)) return -1;
    00159
    00160   return ::GetBridgeSpec(bridge_id)->min_length + 2;
    00161 }
    00162
    00163 /* static */ TileIndex AIBridge::GetOtherBridgeEnd(TileIndex tile)
    00164 {
    00165   if (!::IsValidTile(tile)) return INVALID_TILE;
    00166   if (!IsBridgeTile(tile)) return INVALID_TILE;
    00167
    00168   return ::GetOtherBridgeEnd(tile);
    00169 }