/// <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)
{
foreach (Edge e in geomGraph.Edges)
{
Location eLoc = e.Label.GetLocation(argIndex);
foreach (EdgeIntersection ei in e.EdgeIntersectionList)
{
RelateNode n = (RelateNode)_nodes.AddNode(ei.Coordinate);
if (eLoc == Location.Boundary)
{
n.SetLabelBoundary(argIndex);
}
else if (n.Label.IsNull(argIndex))
{
n.SetLabel(argIndex, Location.Interior);
}
}
}
}
/// <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)
{
foreach (Edge e in _arg[argIndex].Edges)
{
Location eLoc = e.Label.GetLocation(argIndex);
foreach (EdgeIntersection ei in e.EdgeIntersectionList)
{
RelateNode n = (RelateNode)_nodes.Find(ei.Coordinate);
if (n.Label.IsNull(argIndex))
{
if (eLoc == Location.Boundary)
{
n.SetLabelBoundary(argIndex);
}
else
{
n.SetLabel(argIndex, Location.Interior);
}
}
}
}
}