pathfinder_func.h

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/*
 * 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/>.
 */
 
#ifndef PATHFINDER_FUNC_H
#define PATHFINDER_FUNC_H
 
#include "../tile_cmd.h"
#include "../waypoint_base.h"
 
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);
}
 
inline TrackdirBits GetTrackdirBitsForRoad(TileIndex tile, RoadTramType rtt)
{
  TrackdirBits bits = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, rtt));
 
  if (rtt == RTT_TRAM && bits == TRACKDIR_BIT_NONE) {
    if (IsNormalRoadTile(tile)) {
      RoadBits rb = GetRoadBits(tile, RTT_TRAM);
      switch (rb) {
        case ROAD_NE:
        case ROAD_SW:
          bits = TRACKDIR_BIT_X_NE | TRACKDIR_BIT_X_SW;
          break;
 
        case ROAD_NW:
        case ROAD_SE:
          bits = TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_Y_SE;
          break;
 
        default: break;
      }
    }
  }
 
  return bits;
}
 
#endif /* PATHFINDER_FUNC_H */