bridge_map.cpp

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00001 /* $Id: bridge_map.cpp 18058 2009-11-13 17:40:21Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "landscape.h"
00014 #include "tunnelbridge_map.h"
00015 
00016 
00022 static TileIndex GetBridgeEnd(TileIndex tile, DiagDirection dir)
00023 {
00024   TileIndexDiff delta = TileOffsByDiagDir(dir);
00025 
00026   dir = ReverseDiagDir(dir);
00027   do {
00028     tile += delta;
00029   } while (!IsBridgeTile(tile) || GetTunnelBridgeDirection(tile) != dir);
00030 
00031   return tile;
00032 }
00033 
00034 
00035 TileIndex GetNorthernBridgeEnd(TileIndex t)
00036 {
00037   return GetBridgeEnd(t, ReverseDiagDir(AxisToDiagDir(GetBridgeAxis(t))));
00038 }
00039 
00040 
00041 TileIndex GetSouthernBridgeEnd(TileIndex t)
00042 {
00043   return GetBridgeEnd(t, AxisToDiagDir(GetBridgeAxis(t)));
00044 }
00045 
00046 
00047 TileIndex GetOtherBridgeEnd(TileIndex tile)
00048 {
00049   assert(IsBridgeTile(tile));
00050   return GetBridgeEnd(tile, GetTunnelBridgeDirection(tile));
00051 }
00052 
00053 uint GetBridgeHeight(TileIndex t)
00054 {
00055   uint h;
00056   Slope tileh = GetTileSlope(t, &h);
00057   Foundation f = GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(t)));
00058 
00059   /* one height level extra for the ramp */
00060   return h + TILE_HEIGHT + ApplyFoundationToSlope(f, &tileh);
00061 }

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