/// <summary>
///
/// </summary>
/// <param name="ring"></param>
/// <param name="graph"></param>
private static void VisitInteriorRing(IBasicGeometry ring, PlanarGraph graph)
{
IList<Coordinate> pts = ring.Coordinates;
Coordinate pt0 = pts[0];
/*
* Find first point in coord list different to initial point.
* Need special check since the first point may be repeated.
*/
Coordinate pt1 = FindDifferentPoint(pts, pt0);
Edge e = graph.FindEdgeInSameDirection(pt0, pt1);
DirectedEdge de = (DirectedEdge)graph.FindEdgeEnd(e);
DirectedEdge intDe = null;
if (de.Label.GetLocation(0, Positions.Right) == Locations.Interior)
intDe = de;
else if (de.Sym.Label.GetLocation(0, Positions.Right) == Locations.Interior)
intDe = de.Sym;
Assert.IsTrue(intDe != null, "unable to find dirEdge with Interior on RHS");
VisitLinkedDirectedEdges(intDe);
}
