/// <summary>
/// Reverse (or continue in same direction)
/// <\summary>
internal void Reverse(TrackDirection oldDirection, TrackCircuitPartialPathRoute route, float offset)
{
if (null == route)
{
throw new ArgumentNullException(nameof(route));
}
RouteListIndex = route.GetRouteIndex(TrackCircuitSectionIndex, 0);
Direction = RouteListIndex >= 0 ? route[RouteListIndex].Direction : Direction = Direction.Reverse();
TrackCircuitSection section = TrackCircuitSection.TrackCircuitList[TrackCircuitSectionIndex];
if (oldDirection != Direction)
{
Offset = section.Length - Offset; // actual reversal so adjust offset
}
DistanceTravelled = offset;
}
/// Constructor (from route path details)
public TrackCircuitReversalInfo(TrackCircuitPartialPathRoute lastRoute, int prevReversalIndex, TrackCircuitPartialPathRoute firstRoute, float reverseReversalOffset, int reversalIndex, int reversalSectionIndex)
{
// preset values
Valid = false;
LastDivergeIndex = -1;
FirstDivergeIndex = -1;
LastSignalIndex = -1;
FirstSignalIndex = -1;
SignalAvailable = false;
SignalUsed = false;
ReverseReversalOffset = reverseReversalOffset;
ReversalIndex = reversalIndex;
ReversalSectionIndex = reversalSectionIndex;
ReversalActionInserted = false;
// search for first common section in last and first
int lastIndex = lastRoute.Count - 1;
int firstIndex = 0;
int lastCommonSection = -1;
int firstCommonSection = -1;
bool commonFound = false;
bool validDivPoint = false;
while (!commonFound && lastIndex >= 0)
{
TrackCircuitRouteElement lastElement = lastRoute[lastIndex];
while (!commonFound && firstIndex <= firstRoute.Count - 1)
{
TrackCircuitRouteElement firstElement = firstRoute[firstIndex];
if (lastElement.TrackCircuitSection.Index == firstElement.TrackCircuitSection.Index)
{
commonFound = true;
lastCommonSection = lastIndex;
firstCommonSection = firstIndex;
Valid = (lastElement.Direction != firstElement.Direction);
}
else
{
firstIndex++;
}
}
lastIndex--;
firstIndex = 0;
}
// search for last common section going backward along route
// do not go back on last route beyond previous reversal point to prevent fall through of reversals
if (Valid)
{
Valid = false;
lastIndex = lastCommonSection;
firstIndex = firstCommonSection;
int endLastIndex = (prevReversalIndex > 0 && prevReversalIndex < lastCommonSection &&
Simulator.Instance.TimetableMode) ? prevReversalIndex : 0;
while (lastIndex >= endLastIndex && firstIndex <= (firstRoute.Count - 1) && lastRoute[lastIndex].TrackCircuitSection.Index == firstRoute[firstIndex].TrackCircuitSection.Index)
{
LastDivergeIndex = lastIndex;
FirstDivergeIndex = firstIndex;
DivergeSectorIndex = lastRoute[lastIndex].TrackCircuitSection.Index;
lastIndex--;
firstIndex++;
}
// if next route ends within last one, last diverge index can be set to endLastIndex
if (firstIndex > firstRoute.Count - 1)
{
LastDivergeIndex = endLastIndex;
DivergeSectorIndex = lastRoute[endLastIndex].TrackCircuitSection.Index;
}
Valid = LastDivergeIndex >= 0; // it is a reversal
validDivPoint = true;
if (Simulator.Instance.TimetableMode)
{
validDivPoint = LastDivergeIndex > 0 && FirstDivergeIndex < (firstRoute.Count - 1); // valid reversal point
}
if (lastRoute.Count == 1 && FirstDivergeIndex < (firstRoute.Count - 1))
{
validDivPoint = true; // valid reversal point in first and only section
}
}
// determine offset
if (validDivPoint)
{
DivergeOffset = 0.0f;
for (int iSection = LastDivergeIndex; iSection < lastRoute.Count; iSection++)
{
TrackCircuitSection thisSection = lastRoute[iSection].TrackCircuitSection;
DivergeOffset += thisSection.Length;
}
// find last signal furthest away from diverging point
bool signalFound = false;
int startSection = 0;
if (!Simulator.Instance.TimetableMode)
// In activity mode test starts only after reverse point.
{
for (int iSection = 0; iSection < firstRoute.Count; iSection++)
{
if (firstRoute[iSection].TrackCircuitSection.Index == ReversalSectionIndex)
{
startSection = iSection;
break;
}
}
for (int iSection = startSection; iSection <= FirstDivergeIndex && !signalFound; iSection++)
{
TrackCircuitSection thisSection = firstRoute[iSection].TrackCircuitSection;
if (thisSection.EndSignals[firstRoute[iSection].Direction] != null) // signal in required direction
{
signalFound = true;
FirstSignalIndex = iSection;
SignalSectorIndex = thisSection.Index;
}
}
}
// in timetable mode, search for first signal beyond diverging point
else
{
for (int iSection = FirstDivergeIndex; iSection >= startSection && !signalFound; iSection--)
{
TrackCircuitSection thisSection = firstRoute[iSection].TrackCircuitSection;
if (thisSection.EndSignals[firstRoute[iSection].Direction] != null) // signal in required direction
{
signalFound = true;
FirstSignalIndex = iSection;
SignalSectorIndex = thisSection.Index;
}
}
}
// signal found
if (signalFound)
{
LastSignalIndex = lastRoute.GetRouteIndex(SignalSectorIndex, LastDivergeIndex);
if (LastSignalIndex > 0)
{
SignalAvailable = true;
SignalOffset = 0.0f;
for (int iSection = LastSignalIndex; iSection < lastRoute.Count; iSection++)
{
TrackCircuitSection thisSection = lastRoute[iSection].TrackCircuitSection;
SignalOffset += thisSection.Length;
}
}
}
}
else
{
FirstDivergeIndex = -1;
LastDivergeIndex = -1;
}
}//constructor