private Discrete2D?EndSegmentAtFreeEnd(Discrete2D?current, SegmentNode segment, Discrete2D neighbour)
{
// End segment here by adding last node
Debug.Assert(current.HasValue);
Point2D currentGeographic = GridToGeographic(current.Value.I, current.Value.J);
segment.Add(currentGeographic);
Point2D neighbourGeographic = GridToGeographic(neighbour.I, neighbour.J);
segment.Add(neighbourGeographic);
segment.NextBranch = null;
MarkVisited(current.Value);
MarkVisited(neighbour);
return(null);
}
private Discrete2D?AppendToSegment(Discrete2D?current, SegmentNode segment, Discrete2D neighbour)
{
// Add a point to the segment, and move on
Debug.Assert(current.HasValue);
Debug.Assert(IsStem(neighbour));
Point2D currentGeographic = GridToGeographic(current.Value.I, current.Value.J);
segment.Add(currentGeographic);
MarkVisited(current.Value);
return(neighbour);
}
private Discrete2D?EndSegmentAtJunction(Component component, Discrete2D?current, SegmentNode segment, Discrete2D junction)
{
// End segment here with edge to junction
Debug.Assert(current.HasValue);
BranchNode branchPoint = component.junctions[junction];
Point2D geographic = GridToGeographic(current.Value.I, current.Value.J);
segment.Add(geographic);
segment.NextBranch = branchPoint;
MarkVisited(current.Value);
return(null);
}