/// <summary>
/// Calculates the U of the facilitated trip
/// </summary>
/// <param name="tripChain"></param>
/// <param name="oldU"></param>
/// <param name="newU"></param>
public void CalculateU(ITripChain tripChain, out double oldU, out double newU)
{
ITrip facilitatedTrip = (ITrip)tripChain["FacilitateTrip"];
ISharedMode facilitatedTripMode = (ISharedMode)tripChain["SharedMode"];
ITrip connectingTrip = tripChain["ConnectingChain"] as ITrip;
//the mode data for the facilitated trip
ModeData facilitatedTripData = ModeData.Get(facilitatedTrip);
int indexOfPass = TashaRuntime.GetIndexOfMode(facilitatedTripMode);
double UofAuxiliaryTrip = CalculateUofAuxTrip(tripChain);
facilitatedTripData.V[indexOfPass] = facilitatedTripMode.CalculateV(facilitatedTrip);
newU = facilitatedTripData.U(indexOfPass)
+ UofAuxiliaryTrip;
if (facilitatedTrip.Mode == null)
{
// if there is no other way
oldU = float.NegativeInfinity;
}
else
{
if (connectingTrip == null)
{
oldU = facilitatedTripData.U(TashaRuntime.GetIndexOfMode(facilitatedTrip.Mode));
}
else
{
ModeData connectingTripData = ModeData.Get(connectingTrip);
oldU = facilitatedTripData.U(TashaRuntime.GetIndexOfMode(facilitatedTrip.Mode))
+ connectingTripData.U(TashaRuntime.GetIndexOfMode(connectingTrip.Mode));
}
}
}
private double CalculateUofAuxTrip(ITripChain currentTripChain)
{
double U = 0;
for (int i = 0; i < currentTripChain.Trips.Count; i++)
{
var trip = currentTripChain.Trips[i];
ModeData md = ModeData.MakeModeData();
md.Store(trip);
int indexOfMode = TashaRuntime.GetIndexOfMode(trip.Mode);
md.V[indexOfMode] = trip.Mode.CalculateV(trip);
md.Error[indexOfMode] = this.GetNormal();
U += md.U(indexOfMode);
}
currentTripChain.Attach("U", U);
return(U);
}