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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 pathfinder_func.h General functions related to pathfinders. */
#ifndef PATHFINDER_FUNC_H
#define PATHFINDER_FUNC_H
#include "../station_base.h"
#include "../waypoint_base.h"
/**
* Calculates the tile of given station that is closest to a given tile
* for this we assume the station is a rectangle,
* as defined by its tile are (st->train_station)
* @param station The station to calculate the distance to
* @param tile The tile from where to calculate the distance
* @param station_type the station type to get the closest tile of
* @note for simplification STATION_RAIL is also used for waypoints!
* @return The closest station tile to the given tile.
*/
static inline TileIndex CalcClosestStationTile(StationID station, TileIndex tile, StationType station_type)
{
const BaseStation *st = BaseStation::Get(station);
TileArea ta;
st->GetTileArea(&ta, station_type);
/* If the rail station is (temporarily) not present, use the station sign to drive near the station */
if (ta.tile == INVALID_TILE) return st->xy;
uint minx = TileX(ta.tile); // topmost corner of station
uint miny = TileY(ta.tile);
uint maxx = minx + ta.w - 1; // lowermost corner of station
uint maxy = miny + ta.h - 1;
/* we are going the aim for the x coordinate of the closest corner
* but if we are between those coordinates, we will aim for our own x coordinate */
uint x = ClampU(TileX(tile), minx, maxx);
/* same for y coordinate, see above comment */
uint y = ClampU(TileY(tile), miny, maxy);
/* return the tile of our target coordinates */
return TileXY(x, y);
}
#endif /* PATHFINDER_FUNC_H */
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