bridge_map.cpp

Go to the documentation of this file.

/*
 * 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/>.
 */
 
#include "stdafx.h"
#include "landscape.h"
#include "tunnelbridge_map.h"
 
#include "safeguards.h"
 
 
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;
}
 
 
TileIndex GetNorthernBridgeEnd(TileIndex t)
{
  return GetBridgeEnd(t, ReverseDiagDir(AxisToDiagDir(GetBridgeAxis(t))));
}
 
 
TileIndex GetSouthernBridgeEnd(TileIndex t)
{
  return GetBridgeEnd(t, AxisToDiagDir(GetBridgeAxis(t)));
}
 
 
TileIndex GetOtherBridgeEnd(TileIndex tile)
{
  assert(IsBridgeTile(tile));
  return GetBridgeEnd(tile, GetTunnelBridgeDirection(tile));
}
 
int GetBridgeHeight(TileIndex t)
{
  auto [tileh, h] = GetTileSlopeZ(t);
  Foundation f = GetBridgeFoundation(tileh, DiagDirToAxis(GetTunnelBridgeDirection(t)));
 
  /* one height level extra for the ramp */
  return h + 1 + ApplyFoundationToSlope(f, tileh);
}