src/road_map.cpp

   1 /* $Id: road_map.cpp 21846 2011-01-18 23:09:43Z rubidium $ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file road_map.cpp Complex road accessors. */
  11
  12 #include "stdafx.h"
  13 #include "station_map.h"
  14 #include "tunnelbridge_map.h"
  15
  16 #include "safeguards.h"
  17
  18
  19 /**
  20  * Returns the RoadBits on an arbitrary tile
  21  * Special behaviour:
  22  * - road depots: entrance is treated as road piece
  23  * - road tunnels: entrance is treated as road piece
  24  * - bridge ramps: start of the ramp is treated as road piece
  25  * - bridge middle parts: bridge itself is ignored
  26  *
  27  * If straight_tunnel_bridge_entrance is set a ROAD_X or ROAD_Y
  28  * for bridge ramps and tunnel entrances is returned depending
  29  * on the orientation of the tunnel or bridge.
  30  * @param tile the tile to get the road bits for
  31  * @param rt   the road type to get the road bits form
  32  * @param straight_tunnel_bridge_entrance whether to return straight road bits for tunnels/bridges.
  33  * @return the road bits of the given tile
  34  */
  35 RoadBits GetAnyRoadBits(TileIndex tile, RoadType rt, bool straight_tunnel_bridge_entrance)
  36 {
  37         if (!MayHaveRoad(tile) || !HasTileRoadType(tile, rt)) return ROAD_NONE;
  38
  39         switch (GetTileType(tile)) {
  40                 case MP_ROAD:
  41                         switch (GetRoadTileType(tile)) {
  42                                 default:
  43                                 case ROAD_TILE_NORMAL:   return GetRoadBits(tile, rt);
  44                                 case ROAD_TILE_CROSSING: return GetCrossingRoadBits(tile);
  45                                 case ROAD_TILE_DEPOT:    return DiagDirToRoadBits(GetRoadDepotDirection(tile));
  46                         }
  47
  48                 case MP_STATION:
  49                         if (!IsRoadStopTile(tile)) return ROAD_NONE;
  50                         if (IsDriveThroughStopTile(tile)) return (GetRoadStopDir(tile) == DIAGDIR_NE) ? ROAD_X : ROAD_Y;
  51                         return DiagDirToRoadBits(GetRoadStopDir(tile));
  52
  53                 case MP_TUNNELBRIDGE:
  54                         if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return ROAD_NONE;
  55                         if (IsRoadCustomBridgeHeadTile(tile)) return GetCustomBridgeHeadRoadBits(tile, rt);
  56                         return straight_tunnel_bridge_entrance ?
  57                                         AxisToRoadBits(DiagDirToAxis(GetTunnelBridgeDirection(tile))) :
  58                                         DiagDirToRoadBits(ReverseDiagDir(GetTunnelBridgeDirection(tile)));
  59
  60                 default: return ROAD_NONE;
  61         }
  62 }