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/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file ai_bridge.hpp Everything to query and build bridges. */
#ifndef AI_BRIDGE_HPP
#define AI_BRIDGE_HPP
#include "ai_vehicle.hpp"
/**
* Class that handles all bridge related functions.
*/
class AIBridge : public AIObject {
public:
/**
* All bridge related error messages.
*/
enum ErrorMessages {
/** Base for bridge related errors */
ERR_BRIDGE_BASE = AIError::ERR_CAT_BRIDGE << AIError::ERR_CAT_BIT_SIZE,
/**
* The bridge you want to build is not available yet,
* or it is not available for the requested length.
*/
ERR_BRIDGE_TYPE_UNAVAILABLE, // [STR_ERROR_CAN_T_BUILD_BRIDGE_HERE]
/** One (or more) of the bridge head(s) ends in water. */
ERR_BRIDGE_CANNOT_END_IN_WATER, // [STR_ERROR_ENDS_OF_BRIDGE_MUST_BOTH]
/** The bride heads need to be on the same height */
ERR_BRIDGE_HEADS_NOT_ON_SAME_HEIGHT, // [STR_ERROR_BRIDGEHEADS_NOT_SAME_HEIGHT]
};
/**
* Checks whether the given bridge type is valid.
* @param bridge_id The bridge to check.
* @return True if and only if the bridge type is valid.
*/
static bool IsValidBridge(BridgeID bridge_id);
/**
* Checks whether the given tile is actually a bridge start or end tile.
* @param tile The tile to check.
* @pre AIMap::IsValidTile(tile).
* @return True if and only if the tile is the beginning or end of a bridge.
*/
static bool IsBridgeTile(TileIndex tile);
/**
* Get the BridgeID of a bridge at a given tile.
* @param tile The tile to get the BridgeID from.
* @pre IsBridgeTile(tile).
* @return The BridgeID from the bridge at tile 'tile'.
*/
static BridgeID GetBridgeID(TileIndex tile);
/**
* Get the name of a bridge.
* @param bridge_id The bridge to get the name of.
* @pre IsValidBridge(bridge_id).
* @return The name the bridge has.
*/
static char *GetName(BridgeID bridge_id);
/**
* Get the maximum speed of a bridge.
* @param bridge_id The bridge to get the maximum speed of.
* @pre IsValidBridge(bridge_id).
* @return The maximum speed the bridge has.
* @note The speed is in OpenTTD's internal speed unit.
* This is mph / 1.6, which is roughly km/h.
* To get km/h multiply this number by 1.00584.
*/
static int32 GetMaxSpeed(BridgeID bridge_id);
/**
* Get the new cost of a bridge, excluding the road and/or rail.
* @param bridge_id The bridge to get the new cost of.
* @param length The length of the bridge.
* @pre IsValidBridge(bridge_id).
* @return The new cost the bridge has.
*/
static Money GetPrice(BridgeID bridge_id, uint length);
/**
* Get the maximum length of a bridge.
* @param bridge_id The bridge to get the maximum length of.
* @pre IsValidBridge(bridge_id).
* @returns The maximum length the bridge has.
*/
static int32 GetMaxLength(BridgeID bridge_id);
/**
* Get the minimum length of a bridge.
* @param bridge_id The bridge to get the minimum length of.
* @pre IsValidBridge(bridge_id).
* @returns The minimum length the bridge has.
*/
static int32 GetMinLength(BridgeID bridge_id);
#ifndef DOXYGEN_AI_DOCS
/**
* Internal function to help BuildBridge in case of road.
*/
static bool _BuildBridgeRoad1();
/**
* Internal function to help BuildBridge in case of road.
*/
static bool _BuildBridgeRoad2();
#endif
/**
* Build a bridge from one tile to the other.
* As an extra for road, this functions builds two half-pieces of road on
* each end of the bridge, making it easier for you to connect it to your
* network.
* @param vehicle_type The vehicle-type of bridge to build.
* @param bridge_id The bridge-type to build.
* @param start Where to start the bridge.
* @param end Where to end the bridge.
* @pre AIMap::IsValidTile(start).
* @pre AIMap::IsValidTile(end).
* @pre 'start' and 'end' are in a straight line, i.e.
* AIMap::GetTileX(start) == AIMap::GetTileX(end) or
* AIMap::GetTileY(start) == AIMap::GetTileY(end).
* @pre vehicle_type == AIVehicle::VT_ROAD || vehicle_type == AIVehicle::VT_WATER ||
* (vehicle_type == AIVehicle::VT_RAIL && AIRail::IsRailTypeAvailable(AIRail::GetCurrentRailType())).
* @exception AIError::ERR_ALREADY_BUILT
* @exception AIError::ERR_AREA_NOT_CLEAR
* @exception AIError::ERR_LAND_SLOPED_WRONG
* @exception AIError::ERR_VEHICLE_IN_THE_WAY
* @exception AIBridge::ERR_BRIDGE_TYPE_UNAVAILABLE
* @exception AIBridge::ERR_BRIDGE_CANNOT_END_IN_WATER
* @exception AIBridge::ERR_BRIDGE_HEADS_NOT_ON_SAME_HEIGHT
* @return Whether the bridge has been/can be build or not.
* @note No matter if the road pieces were build or not, if building the
* bridge succeeded, this function returns true.
*/
static bool BuildBridge(AIVehicle::VehicleType vehicle_type, BridgeID bridge_id, TileIndex start, TileIndex end);
/**
* Removes a bridge, by executing it on either the start or end tile.
* @param tile An end or start tile of the bridge.
* @pre AIMap::IsValidTile(tile).
* @exception AIError::ERR_OWNED_BY_ANOTHER_COMPANY
* @return Whether the bridge has been/can be removed or not.
*/
static bool RemoveBridge(TileIndex tile);
/**
* Get the tile that is on the other end of a bridge starting at tile.
* @param tile The tile that is an end of a bridge.
* @pre AIMap::IsValidTile(tile).
* @pre IsBridgeTile(tile).
* @return The TileIndex that is the other end of the bridge.
*/
static TileIndex GetOtherBridgeEnd(TileIndex tile);
};
#endif /* AI_BRIDGE_HPP */
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