If you want to change a node's shape (e.g., to make nodes round instead of square), have a look at ElementDrawing.java, in particular the drawNode() method. This is where you would substitute your own logic into the code.
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In reply to http://sourceforge.net/forum/message.php?msg_id=1580385 :
> I want influence the appearence of the nodes.
> Are there any
> framework-mechanisms provided for changing
> their outlook?
You can control node appearance in two ways: size and color.
See http://sourceforge.net/forum/forum.php?thread_id=654582&forum_id=126557 for a description of the "colour" command.
See http://sourceforge.net/forum/forum.php?thread_id=650310&forum_id=126557 for a description of the "resize" command. You can also use the node size slider on the right-hand side of the panel.
If you want to change a node's shape (e.g., to make nodes round instead of square), have a look at ElementDrawing.java, in particular the drawNode() method. This is where you would substitute your own logic into the code.