/**
* Gets the state of the signal along the given trackdir.
*
* Along meaning if you are currently driving on the given trackdir, this is
* the signal that is facing us (for which we stop when it's red).
*/
public static SignalState GetSignalStateByTrackdir(TileIndex tile, Trackdir trackdir)
{
Debug.Assert(IsValidTrackdir(trackdir));
Debug.Assert(HasSignalOnTrack(tile, TrackdirToTrack(trackdir)));
return(GetSignalStates(tile) & SignalAlongTrackdir(trackdir)
? SignalState.SIGNAL_STATE_GREEN
: SignalState.SIGNAL_STATE_RED);
}
/**
* Sets the state of the signal along the given trackdir.
*/
public static void SetSignalStateByTrackdir(TileIndex tile, Trackdir trackdir, SignalState state)
{
if (state == SignalState.SIGNAL_STATE_GREEN)
{
// set 1
SetSignalStates(tile, GetSignalStates(tile) | SignalAlongTrackdir(trackdir));
}
else
{
SetSignalStates(tile, GetSignalStates(tile) & ~SignalAlongTrackdir(trackdir));
}
}
/**
* Is a one-way signal blocking the trackdir? A one-way signal on the
* trackdir against will block, but signals on both trackdirs won't.
* @param tile the tile to check
* @param td the trackdir to check
*/
public static bool HasOnewaySignalBlockingTrackdir(TileIndex tile, Trackdir td)
{
return(TileMap.IsTileType(tile, TileType.MP_RAILWAY) && HasSignalOnTrackdir(tile, ReverseTrackdir(td)) &&
!HasSignalOnTrackdir(tile, td) && IsOnewaySignal(tile, TrackdirToTrack(td)));
}
/**
* Is a pbs signal present along the trackdir?
* @param tile the tile to check
* @param td the trackdir to check
*/
public static bool HasPbsSignalOnTrackdir(TileIndex tile, Trackdir td)
{
return(TileMap.IsTileType(tile, TileType.MP_RAILWAY) && HasSignalOnTrackdir(tile, td) &&
IsPbsSignal(GetSignalType(tile, TrackdirToTrack(td))));
}
/**
* Checks for the presence of signals along the given trackdir on the given
* rail tile.
*
* Along meaning if you are currently driving on the given trackdir, this is
* the signal that is facing us (for which we stop when it's red).
*/
public static bool HasSignalOnTrackdir(TileIndex tile, Trackdir trackdir)
{
Debug.Assert(IsValidTrackdir(trackdir));
return(GetRailTileType(tile) == RailTileType.RAIL_TILE_SIGNALS &&
GetPresentSignals(tile) & SignalAlongTrackdir(trackdir));
}
