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/* $Id: ai_bridge.cpp 15912 2009-04-01 14:24:54Z rubidium $ */
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/** @file ai_bridge.cpp Implementation of AIBridge. */
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#include "ai_bridge.hpp"
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#include "../ai_instance.hpp"
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#include "../../bridge_map.h"
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#include "../../strings_func.h"
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#include "../../core/alloc_func.hpp"
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#include "../../economy_func.h"
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#include "../../settings_type.h"
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#include "../../date_func.h"
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/* static */ bool AIBridge::IsValidBridge(BridgeID bridge_id)
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return bridge_id < MAX_BRIDGES && ::GetBridgeSpec(bridge_id)->avail_year <= _cur_year;
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/* static */ bool AIBridge::IsBridgeTile(TileIndex tile)
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if (!::IsValidTile(tile)) return false;
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return ::IsBridgeTile(tile);
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/* static */ BridgeID AIBridge::GetBridgeID(TileIndex tile)
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if (!IsBridgeTile(tile)) return (BridgeID)-1;
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return (BridgeID)::GetBridgeType(tile);
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static void _DoCommandReturnBuildBridge2(class AIInstance *instance)
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if (!AIBridge::_BuildBridgeRoad2()) {
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AIObject::SetLastCommandRes(false);
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AIInstance::DoCommandReturn(instance);
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/* This can never happen, as in test-mode this callback is never executed,
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* and in execute-mode, the other callback is called. */
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static void _DoCommandReturnBuildBridge1(class AIInstance *instance)
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if (!AIBridge::_BuildBridgeRoad1()) {
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AIObject::SetLastCommandRes(false);
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AIInstance::DoCommandReturn(instance);
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/* This can never happen, as in test-mode this callback is never executed,
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* and in execute-mode, the other callback is called. */
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/* static */ bool AIBridge::BuildBridge(AIVehicle::VehicleType vehicle_type, BridgeID bridge_id, TileIndex start, TileIndex end)
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EnforcePrecondition(false, start != end);
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EnforcePrecondition(false, ::IsValidTile(start) && ::IsValidTile(end));
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EnforcePrecondition(false, TileX(start) == TileX(end) || TileY(start) == TileY(end));
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EnforcePrecondition(false, vehicle_type == AIVehicle::VT_ROAD || vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER);
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EnforcePrecondition(false, vehicle_type != AIVehicle::VT_RAIL || AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType()));
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switch (vehicle_type) {
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case AIVehicle::VT_ROAD:
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type |= (TRANSPORT_ROAD << 15);
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type |= (RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType()) << 8);
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case AIVehicle::VT_RAIL:
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type |= (TRANSPORT_RAIL << 15);
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type |= (AIRail::GetCurrentRailType() << 8);
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case AIVehicle::VT_WATER:
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type |= (TRANSPORT_WATER << 15);
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default: NOT_REACHED();
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/* For rail and water we do nothing special */
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if (vehicle_type == AIVehicle::VT_RAIL || vehicle_type == AIVehicle::VT_WATER) {
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return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE);
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AIObject::SetCallbackVariable(0, start);
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AIObject::SetCallbackVariable(1, end);
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if (!AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE, NULL, &_DoCommandReturnBuildBridge1)) return false;
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/* In case of test-mode, test if we can build both road pieces */
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return _BuildBridgeRoad1();
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/* static */ bool AIBridge::_BuildBridgeRoad1()
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/* Build the piece of road on the 'start' side of the bridge */
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TileIndex end = AIObject::GetCallbackVariable(0);
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TileIndex start = AIObject::GetCallbackVariable(1);
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DiagDirection dir_1 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
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DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
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if (!AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD, NULL, &_DoCommandReturnBuildBridge2)) return false;
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/* In case of test-mode, test the other road piece too */
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return _BuildBridgeRoad2();
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/* static */ bool AIBridge::_BuildBridgeRoad2()
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/* Build the piece of road on the 'end' side of the bridge */
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TileIndex end = AIObject::GetCallbackVariable(0);
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TileIndex start = AIObject::GetCallbackVariable(1);
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DiagDirection dir_1 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
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DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
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return AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
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/* static */ bool AIBridge::RemoveBridge(TileIndex tile)
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EnforcePrecondition(false, IsBridgeTile(tile));
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return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
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/* static */ char *AIBridge::GetName(BridgeID bridge_id)
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if (!IsValidBridge(bridge_id)) return NULL;
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static const int len = 64;
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char *bridge_name = MallocT<char>(len);
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::GetString(bridge_name, ::GetBridgeSpec(bridge_id)->transport_name[0], &bridge_name[len - 1]);
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/* static */ int32 AIBridge::GetMaxSpeed(BridgeID bridge_id)
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if (!IsValidBridge(bridge_id)) return -1;
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return ::GetBridgeSpec(bridge_id)->speed; // km-ish/h
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/* static */ Money AIBridge::GetPrice(BridgeID bridge_id, uint length)
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if (!IsValidBridge(bridge_id)) return -1;
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return length * _price.build_bridge * ::GetBridgeSpec(bridge_id)->price >> 8;
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/* static */ int32 AIBridge::GetMaxLength(BridgeID bridge_id)
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if (!IsValidBridge(bridge_id)) return -1;
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uint max = ::GetBridgeSpec(bridge_id)->max_length;
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if (max >= 16 && _settings_game.construction.longbridges) max = 100;
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/* static */ int32 AIBridge::GetMinLength(BridgeID bridge_id)
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if (!IsValidBridge(bridge_id)) return -1;
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return ::GetBridgeSpec(bridge_id)->min_length + 2;
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/* static */ TileIndex AIBridge::GetOtherBridgeEnd(TileIndex tile)
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if (!::IsValidTile(tile)) return INVALID_TILE;
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if (!IsBridgeTile(tile)) return INVALID_TILE;
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return ::GetOtherBridgeEnd(tile);
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src/ai/api/ai_bridge.cpp
