/// <summary>
/// For all intersections on the edges of a Geometry,
/// label the corresponding node IF it doesn't already have a label.
/// This allows nodes created by either self-intersections or
/// mutual intersections to be labelled.
/// Endpoint nodes will already be labelled from when they were inserted.
/// </summary>
/// <param name="argIndex"></param>
private void LabelIntersectionNodes(int argIndex)
{
for (IEnumerator i = arg[argIndex].GetEdgeEnumerator(); i.MoveNext(); )
{
Edge e = (Edge)i.Current;
Locations eLoc = e.Label.GetLocation(argIndex);
for (IEnumerator eiIt = e.EdgeIntersectionList.GetEnumerator(); eiIt.MoveNext(); )
{
EdgeIntersection ei = (EdgeIntersection)eiIt.Current;
RelateNode n = (RelateNode)nodes.Find(ei.Coordinate);
if (n.Label.IsNull(argIndex))
{
if (eLoc == Locations.Boundary)
n.SetLabelBoundary(argIndex);
else n.SetLabel(argIndex, Locations.Interior);
}
}
}
}
/// <summary>
/// Insert nodes for all intersections on the edges of a Geometry.
/// Label the created nodes the same as the edge label if they do not already have a label.
/// This allows nodes created by either self-intersections or
/// mutual intersections to be labelled.
/// Endpoint nodes will already be labelled from when they were inserted.
/// Precondition: edge intersections have been computed.
/// </summary>
/// <param name="geomGraph"></param>
/// <param name="argIndex"></param>
public void ComputeIntersectionNodes(GeometryGraph geomGraph, int argIndex)
{
for (IEnumerator edgeIt = geomGraph.GetEdgeEnumerator(); edgeIt.MoveNext();)
{
Edge e = (Edge)edgeIt.Current;
Locations eLoc = e.Label.GetLocation(argIndex);
for (IEnumerator eiIt = e.EdgeIntersectionList.GetEnumerator(); eiIt.MoveNext();)
{
EdgeIntersection ei = (EdgeIntersection)eiIt.Current;
RelateNode n = (RelateNode)nodes.AddNode(ei.Coordinate);
if (eLoc == Locations.Boundary)
{
n.SetLabelBoundary(argIndex);
}
else if (n.Label.IsNull(argIndex))
{
n.SetLabel(argIndex, Locations.Interior);
}
}
}
}