src/road_map.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file road_map.cpp Complex road accessors. */
   9
  10 #include "stdafx.h"
  11 #include "station_map.h"
  12 #include "tunnelbridge_map.h"
  13
  14 #include "safeguards.h"
  15
  16
  17 /**
  18  * Returns the RoadBits on an arbitrary tile
  19  * Special behaviour:
  20  * - road depots: entrance is treated as road piece
  21  * - road tunnels: entrance is treated as road piece
  22  * - bridge ramps: start of the ramp is treated as road piece
  23  * - bridge middle parts: bridge itself is ignored
  24  *
  25  * If straight_tunnel_bridge_entrance is set a ROAD_X or ROAD_Y
  26  * for bridge ramps and tunnel entrances is returned depending
  27  * on the orientation of the tunnel or bridge.
  28  * @param tile the tile to get the road bits for
  29  * @param rt   the road type to get the road bits form
  30  * @param straight_tunnel_bridge_entrance whether to return straight road bits for tunnels/bridges.
  31  * @return the road bits of the given tile
  32  */
  33 RoadBits GetAnyRoadBits(Tile tile, RoadTramType rtt, bool straight_tunnel_bridge_entrance)
  34 {
  35         if (!MayHaveRoad(tile) || !HasTileRoadType(tile, rtt)) return ROAD_NONE;
  36
  37         switch (GetTileType(tile)) {
  38                 case MP_ROAD:
  39                         switch (GetRoadTileType(tile)) {
  40                                 default:
  41                                 case ROAD_TILE_NORMAL:   return GetRoadBits(tile, rtt);
  42                                 case ROAD_TILE_CROSSING: return GetCrossingRoadBits(tile);
  43                                 case ROAD_TILE_DEPOT:    return DiagDirToRoadBits(GetRoadDepotDirection(tile));
  44                         }
  45
  46                 case MP_STATION:
  47                         if (!IsAnyRoadStopTile(tile)) return ROAD_NONE;
  48                         if (IsDriveThroughStopTile(tile)) return AxisToRoadBits(GetDriveThroughStopAxis(tile));
  49                         return DiagDirToRoadBits(GetBayRoadStopDir(tile));
  50
  51                 case MP_TUNNELBRIDGE:
  52                         if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return ROAD_NONE;
  53                         return straight_tunnel_bridge_entrance ?
  54                                         AxisToRoadBits(DiagDirToAxis(GetTunnelBridgeDirection(tile))) :
  55                                         DiagDirToRoadBits(ReverseDiagDir(GetTunnelBridgeDirection(tile)));
  56
  57                 default: return ROAD_NONE;
  58         }
  59 }