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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/>.
*/
/** @file road_map.cpp Complex road accessors. */
#include "stdafx.h"
#include "station_map.h"
#include "tunnelbridge_map.h"
#include "safeguards.h"
/**
* Returns the RoadBits on an arbitrary tile
* Special behaviour:
* - road depots: entrance is treated as road piece
* - road tunnels: entrance is treated as road piece
* - bridge ramps: start of the ramp is treated as road piece
* - bridge middle parts: bridge itself is ignored
*
* If straight_tunnel_bridge_entrance is set a ROAD_X or ROAD_Y
* for bridge ramps and tunnel entrances is returned depending
* on the orientation of the tunnel or bridge.
* @param tile the tile to get the road bits for
* @param rt the road type to get the road bits form
* @param straight_tunnel_bridge_entrance whether to return straight road bits for tunnels/bridges.
* @return the road bits of the given tile
*/
RoadBits GetAnyRoadBits(TileIndex tile, RoadTramType rtt, bool straight_tunnel_bridge_entrance)
{
if (!MayHaveRoad(tile) || !HasTileRoadType(tile, rtt)) return ROAD_NONE;
switch (GetTileType(tile)) {
case MP_ROAD:
switch (GetRoadTileType(tile)) {
default:
case ROAD_TILE_NORMAL: return GetRoadBits(tile, rtt);
case ROAD_TILE_CROSSING: return GetCrossingRoadBits(tile);
case ROAD_TILE_DEPOT: return DiagDirToRoadBits(GetRoadDepotDirection(tile));
}
case MP_STATION:
if (!IsRoadStopTile(tile)) return ROAD_NONE;
if (IsDriveThroughStopTile(tile)) return (GetRoadStopDir(tile) == DIAGDIR_NE) ? ROAD_X : ROAD_Y;
return DiagDirToRoadBits(GetRoadStopDir(tile));
case MP_TUNNELBRIDGE:
if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return ROAD_NONE;
return straight_tunnel_bridge_entrance ?
AxisToRoadBits(DiagDirToAxis(GetTunnelBridgeDirection(tile))) :
DiagDirToRoadBits(ReverseDiagDir(GetTunnelBridgeDirection(tile)));
default: return ROAD_NONE;
}
}
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