/* $Id$ */ /* * 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 bridge_map.cpp Map accessor functions for bridges. */ #include "stdafx.h" #include "landscape.h" #include "tunnelbridge_map.h" #include "safeguards.h" /** * Finds the end of a bridge in the specified direction starting at a middle tile * @param tile the bridge tile to find the bridge ramp for * @param dir the direction to search in */ static TileIndex GetBridgeEnd(TileIndex tile, DiagDirection dir) { TileIndexDiff delta = TileOffsByDiagDir(dir); dir = ReverseDiagDir(dir); do { tile += delta; } while (!IsBridgeTile(tile) || GetTunnelBridgeDirection(tile) != dir); return tile; } /** * Finds the northern end of a bridge starting at a middle tile * @param t the bridge tile to find the bridge ramp for */ TileIndex GetNorthernBridgeEnd(TileIndex t) { return GetBridgeEnd(t, ReverseDiagDir(AxisToDiagDir(GetBridgeAxis(t)))); } /** * Finds the southern end of a bridge starting at a middle tile * @param t the bridge tile to find the bridge ramp for */ TileIndex GetSouthernBridgeEnd(TileIndex t) { return GetBridgeEnd(t, AxisToDiagDir(GetBridgeAxis(t))); } /** * Starting at one bridge end finds the other bridge end * @param tile the bridge ramp tile to find the other bridge ramp for */ TileIndex GetOtherBridgeEnd(TileIndex tile) { assert(IsBridgeTile(tile)); return GetBridgeEnd(tile, GetTunnelBridgeDirection(tile)); } /** * Get the height ('z') of a bridge. * @param t the bridge ramp tile to get the bridge height from * @return the height of the bridge. */ int GetBridgeHeight(TileIndex t) { int h; Slope tileh = GetTileSlope(t, &h); Foundation f = GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(t))); /* one height level extra for the ramp */ return h + 1 + ApplyFoundationToSlope(f, &tileh); }