(svn r13531) [NoAI] -Add [API CHANGE]: when building a bridge/tunnel for road/tram, the BuildBridge/BuildTunnel function will now also make two half-road/half-tram pieces on both ends of the bridge/tunnel, so it is easier for you to connect them to your network. This give a more consistant behavior for road.
-Note: if the road pieces failed to build, but building the bridge/tunnel succeeded, the function still returns true (for the obvious reasons)
/* $Id$ */
/** @file ai_tunnel.cpp Implementation of AITunnel. */
#include "ai_tunnel.hpp"
#include "ai_map.hpp"
#include "../../openttd.h"
#include "../../landscape.h"
#include "../../tunnel_map.h"
#include "../../road_type.h"
#include "../../command_func.h"
#include "../../tunnelbridge.h"
#include "../../road_func.h"
/* static */ bool AITunnel::IsTunnelTile(TileIndex tile)
{
return ::IsTunnelTile(tile);
}
/* static */ TileIndex AITunnel::GetOtherTunnelEnd(TileIndex tile)
{
if (!::IsValidTile(tile)) return INVALID_TILE;
/* If it's a tunnel alread, take the easy way out! */
if (IsTunnelTile(tile)) return ::GetOtherTunnelEnd(tile);
::DoCommand(tile, 0, 0, DC_AUTO, CMD_BUILD_TUNNEL);
return _build_tunnel_endtile == 0 ? INVALID_TILE : _build_tunnel_endtile;
}
/* static */ bool AITunnel::BuildTunnel(AIVehicle::VehicleType vehicle_type, TileIndex start)
{
EnforcePrecondition(false, ::IsValidTile(start));
EnforcePrecondition(false, vehicle_type == AIVehicle::VEHICLE_RAIL || vehicle_type == AIVehicle::VEHICLE_ROAD);
uint type = 0;
if (vehicle_type == AIVehicle::VEHICLE_ROAD) {
type |= (TRANSPORT_ROAD << 9);
type |= RoadTypeToRoadTypes((::RoadType)AIObject::GetRoadType());
} else {
type |= (TRANSPORT_RAIL << 9);
type |= RAILTYPES_RAIL;
}
if (!AIObject::DoCommand(start, type, 0, CMD_BUILD_TUNNEL)) return false;
if (vehicle_type == AIVehicle::VEHICLE_RAIL) return true;
/* Build 2 road-pieces at both ends of the tunnel */
TileIndex end = AIObject::GetNewTunnelEndtile();
DiagDirection dir_1 = (DiagDirection)((::TileX(start) == ::TileX(end)) ? (::TileY(start) < ::TileY(end) ? DIAGDIR_NW : DIAGDIR_SE) : (::TileX(start) < ::TileX(end) ? DIAGDIR_NE : DIAGDIR_SW));
DiagDirection dir_2 = ::ReverseDiagDir(dir_1);
AIObject::DoCommand(start + ::TileOffsByDiagDir(dir_1), ::DiagDirToRoadBits(dir_2) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
AIObject::DoCommand(end + ::TileOffsByDiagDir(dir_2), ::DiagDirToRoadBits(dir_1) | (AIObject::GetRoadType() << 4), 0, CMD_BUILD_ROAD);
return true;
}
/* static */ bool AITunnel::RemoveTunnel(TileIndex tile)
{
EnforcePrecondition(false, IsTunnelTile(tile));
return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
}