mirror of https://github.com/OpenTTD/OpenTTD.git
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file bridge_map.cpp Map accessor functions for bridges. */
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#include "stdafx.h"
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#include "landscape.h"
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#include "tunnelbridge_map.h"
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#include "safeguards.h"
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/**
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* Finds the end of a bridge in the specified direction starting at a middle tile
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* @param tile the bridge tile to find the bridge ramp for
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* @param dir the direction to search in
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*/
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static TileIndex GetBridgeEnd(TileIndex tile, DiagDirection dir)
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{
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TileIndexDiff delta = TileOffsByDiagDir(dir);
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dir = ReverseDiagDir(dir);
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do {
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tile += delta;
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} while (!IsBridgeTile(tile) || GetTunnelBridgeDirection(tile) != dir);
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return tile;
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}
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/**
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* Finds the northern end of a bridge starting at a middle tile
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* @param t the bridge tile to find the bridge ramp for
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*/
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TileIndex GetNorthernBridgeEnd(TileIndex t)
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{
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return GetBridgeEnd(t, ReverseDiagDir(AxisToDiagDir(GetBridgeAxis(t))));
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}
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/**
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* Finds the southern end of a bridge starting at a middle tile
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* @param t the bridge tile to find the bridge ramp for
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*/
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TileIndex GetSouthernBridgeEnd(TileIndex t)
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{
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return GetBridgeEnd(t, AxisToDiagDir(GetBridgeAxis(t)));
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}
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/**
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* Starting at one bridge end finds the other bridge end
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* @param tile the bridge ramp tile to find the other bridge ramp for
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*/
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TileIndex GetOtherBridgeEnd(TileIndex tile)
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{
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assert(IsBridgeTile(tile));
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return GetBridgeEnd(tile, GetTunnelBridgeDirection(tile));
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}
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/**
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* Get the height ('z') of a bridge.
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* @param t the bridge ramp tile to get the bridge height from
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* @return the height of the bridge.
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*/
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int GetBridgeHeight(TileIndex t)
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{
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auto [tileh, h] = GetTileSlopeZ(t);
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Foundation f = GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(t)));
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/* one height level extra for the ramp */
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return h + 1 + ApplyFoundationToSlope(f, tileh);
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}
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