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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_station.hpp Everything to query and build stations. */
#ifndef AI_STATION_HPP
#define AI_STATION_HPP
#include "ai_road.hpp"
#include "ai_basestation.hpp"
/**
* Class that handles all station related functions.
*/
class AIStation : public AIBaseStation {
public:
/**
* All station related error messages.
*/
enum ErrorMessages {
/** Base for station related errors */
ERR_STATION_BASE = AIError::ERR_CAT_STATION << AIError::ERR_CAT_BIT_SIZE,
/** The station is build too close to another station, airport or dock */
ERR_STATION_TOO_CLOSE_TO_ANOTHER_STATION, // [STR_ERROR_TOO_CLOSE_TO_ANOTHER_AIRPORT, STR_ERROR_TOO_CLOSE_TO_ANOTHER_STATION, STR_ERROR_TOO_CLOSE_TO_ANOTHER_DOCK]
/** There are too many stations, airports and docks in the game */
ERR_STATION_TOO_MANY_STATIONS, // [STR_ERROR_TOO_MANY_STATIONS_LOADING, STR_ERROR_TOO_MANY_TRUCK_STOPS, STR_ERROR_TOO_MANY_BUS_STOPS]
/** There are too many stations, airports of docks in a town */
ERR_STATION_TOO_MANY_STATIONS_IN_TOWN, // [STR_ERROR_LOCAL_AUTHORITY_REFUSES_AIRPORT]
};
/**
* Type of stations known in the game.
*/
enum StationType {
/* Values are important, as they represent the internal state of the game. */
STATION_TRAIN = 0x01, ///< Train station
STATION_TRUCK_STOP = 0x02, ///< Truck station
STATION_BUS_STOP = 0x04, ///< Bus station
STATION_AIRPORT = 0x08, ///< Airport
STATION_DOCK = 0x10, ///< Dock
STATION_ANY = 0x1F, ///< All station types
};
/**
* Checks whether the given station is valid and owned by you.
* @param station_id The station to check.
* @return True if and only if the station is valid.
*/
static bool IsValidStation(StationID station_id);
/**
* Get the StationID of a tile, if there is a station.
* @param tile The tile to find the stationID of
* @return StationID of the station.
* @post Use IsValidStation() to see if the station is valid.
*/
static StationID GetStationID(TileIndex tile);
/**
* See how much cargo there is waiting on a station.
* @param station_id The station to get the cargo-waiting of.
* @param cargo_id The cargo to get the cargo-waiting of.
* @pre IsValidStation(station_id).
* @pre IsValidCargo(cargo_id).
* @return The amount of units waiting at the station.
*/
static int32 GetCargoWaiting(StationID station_id, CargoID cargo_id);
/**
* See how high the rating is of a cargo on a station.
* @param station_id The station to get the cargo-rating of.
* @param cargo_id The cargo to get the cargo-rating of.
* @pre IsValidStation(station_id).
* @pre IsValidCargo(cargo_id).
* @return The rating in percent of the cargo on the station.
*/
static int32 GetCargoRating(StationID station_id, CargoID cargo_id);
/**
* Get the coverage radius of this type of station.
* @param station_type The type of station.
* @return The radius in tiles.
*/
static int32 GetCoverageRadius(AIStation::StationType station_type);
/**
* Get the manhattan distance from the tile to the AIStation::GetLocation()
* of the station.
* @param station_id The station to get the distance to.
* @param tile The tile to get the distance to.
* @pre IsValidStation(station_id).
* @return The distance between station and tile.
*/
static int32 GetDistanceManhattanToTile(StationID station_id, TileIndex tile);
/**
* Get the square distance from the tile to the AIStation::GetLocation()
* of the station.
* @param station_id The station to get the distance to.
* @param tile The tile to get the distance to.
* @pre IsValidStation(station_id).
* @return The distance between station and tile.
*/
static int32 GetDistanceSquareToTile(StationID station_id, TileIndex tile);
/**
* Find out if this station is within the rating influence of a town.
* The service quality of stations with signs within this radius
* influences the rating of the town.
* @param station_id The station to check.
* @param town_id The town to check.
* @return True if the tile is within the rating influence of the town.
*/
static bool IsWithinTownInfluence(StationID station_id, TownID town_id);
/**
* Check if any part of the station contains a station of the type
* StationType
* @param station_id The station to look at.
* @param station_type The StationType to look for.
* @return True if the station has a station part of the type StationType.
*/
static bool HasStationType(StationID station_id, StationType station_type);
/**
* Check if any part of the station contains a station of the type
* RoadType.
* @param station_id The station to look at.
* @param road_type The RoadType to look for.
* @return True if the station has a station part of the type RoadType.
*/
static bool HasRoadType(StationID station_id, AIRoad::RoadType road_type);
/**
* Get the town that was nearest to the given station when the station was built.
* @param station_id The station to look at.
* @return The TownID of the town whose center tile was closest to the station
* at the time the station was built.
* @note There is no guarantee that the station is even near the returned town
* nor that the returns town is closest to the station now. A station that was
* 'walked' to the other end of the map will still return the same town. Also,
* towns grow, towns change. So don't depend on this value too much.
*/
static TownID GetNearestTown(StationID station_id);
};
DECLARE_ENUM_AS_BIT_SET(AIStation::StationType)
#endif /* AI_STATION_HPP */
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