The grapher

Graphers can store graphic objects including general nodes, composite nodes, and general links. They provide the infrastructure that is minimally necessary to draw a graph.
A grapher ( IlvGrapher instance) is a JViews Framework object created by the IlvDiagrammer instance. You may need to access the grapher to modify the graphic objects of the diagram directly. The following code example shows how to access the grapher.
Accessing the grapher of a diagram component
IlvGrapher = diagrammer.getEngine().getGrapher();
For more details on graphers, see Graphers in The Essential JViews Framework.