/// <summary>
/// Determine where exactly the current trainpath node is on the track node
/// </summary>
/// <param name="startNode">The start node</param>
/// <param name="nextNode">The next node (so also the direction can be understood)</param>
/// <param name="tn">The tracknode connecting the startNode and nextNode</param>
/// <param name="isForward">Output: whether going from startNode to nextNode is in the forward direction of the track</param>
/// <param name="tvsiStart">Output: the track vector section index of where the startNode is</param>
/// <param name="sectionOffsetStart">Output: the offset in the section (in the direction of the tracknode, not necessarily in the direction from startNode to nextNode)</param>
private void DetermineSectionDetails(TrainpathNode startNode, TrainpathNode nextNode, TrackNode tn, out bool isForward, out int tvsiStart, out float sectionOffsetStart)
{
TrainpathVectorNode currentNodeAsVector = startNode as TrainpathVectorNode;
TrainpathJunctionNode currentNodeAsJunction = startNode as TrainpathJunctionNode;
if (currentNodeAsJunction != null)
{ // we start at a junction node
isForward = (currentNodeAsJunction.JunctionIndex == tn.JunctionIndexAtStart());
if (isForward)
{
tvsiStart = 0;
sectionOffsetStart = 0;
}
else
{
tvsiStart = tn.TrVectorNode.TrVectorSections.Count() - 1;
sectionOffsetStart = SectionLengthAlongTrack(tn, tvsiStart);
}
}
else
{ // we start at a vector node
isForward = currentNodeAsVector.IsEarlierOnTrackThan(nextNode);
tvsiStart = currentNodeAsVector.TrackVectorSectionIndex;
sectionOffsetStart = currentNodeAsVector.TrackSectionOffset;
}
}
/// <summary>
/// Determine if the path from currentNode to nextNode is in the forward direction of the track (along main path)
/// </summary>
private bool DetermineIfForward(TrainpathNode currentNode, TrainpathNode nextNode)
{ // It would be nice if we could separate this into different classes for vector and junction, but this would mean creating three additional classes for only a few methods
TrainpathVectorNode currentNodeAsVector = currentNode as TrainpathVectorNode;
if (currentNodeAsVector != null)
{
return(currentNodeAsVector.IsEarlierOnTrackThan(nextNode));
}
else
{
TrainpathJunctionNode currentNodeAsJunction = currentNode as TrainpathJunctionNode;
return(currentNodeAsJunction.JunctionIndex == trackDB.TrackNodes[currentNode.NextMainTvnIndex].JunctionIndexAtStart());
}
}