The Rete Tree View shows you the current Rete Network for your DRL file. You display it by clicking on the tab "Rete Tree" at the bottom of the DRL Editor window. With the Rete Network visualization being open, you can use drag-and-drop on individual nodes to arrange optimal network overview. You may also select multiple nodes by dragging a rectangle over them; then the entire group can be moved around. The Eclips toolbar icons for zooming in and out can be used in the customary manner.
In the current release there is no export function to creates a gif or jpeg file. Meanwhile, please use ctrl + alt + print to create a copy of your current Eclipse window, and cut it off.
The Rete View is an advanced feature which takes full advantage of the Eclipse Graphical Editing Framework (GEF).
The Rete view works only in Drools Rule Projects, where the Drools Builder is set in the project´s properties.
If you are using Drools in another type of project where you are not having a Drools Rule Project with the appropriate Drools Builder, you can use a workaround: Set up a little Drools Rule Project next to it, putting needed libraries into it, and the DRLs you want to inspect with the Rete View. Just click on the right tab below in the DRL Editor, followed by a click on "Generate Rete View".