/// <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.
/// <para>
/// Precondition: edge intersections have been computed.
/// </para>
/// </summary>
public void ComputeIntersectionNodes(GeometryGraph geomGraph, int argIndex)
{
for (IEdgeEnumerator edgeIt = geomGraph.EdgeIterator; edgeIt.MoveNext();)
{
Edge e = edgeIt.Current;
int eLoc = e.Label.GetLocation(argIndex);
for (IEnumerator eiIt = e.EdgeIntersectionList.Iterator(); eiIt.MoveNext();)
{
EdgeIntersection ei = (EdgeIntersection)eiIt.Current;
RelateNode n = (RelateNode)nodes.AddNode(ei.coord);
if (eLoc == LocationType.Boundary)
{
n.SetLabelBoundary(argIndex);
}
else
{
if (n.Label.IsNull(argIndex))
{
n.SetLabel(argIndex, LocationType.Interior);
}
}
}
}
}
private void LabelNodeEdges()
{
for (IEnumerator ni = nodes.Iterator(); ni.MoveNext();)
{
RelateNode node = (RelateNode)ni.Current;
node.Edges.ComputeLabelling(arg);
}
}
/// <summary>
/// Update the IM with the sum of the IMs for each component.
/// </summary>
private void UpdateIM(IntersectionMatrix im)
{
for (IEdgeEnumerator ei = isolatedEdges.GetEnumerator(); ei.MoveNext();)
{
Edge e = ei.Current;
e.UpdateIM(im);
}
for (IEnumerator ni = nodes.Iterator(); ni.MoveNext();)
{
RelateNode node = (RelateNode)ni.Current;
node.UpdateIM(im);
node.updateIMFromEdges(im);
}
}
