We'll have to add a new method to ScriptHelper to let you create a PathFinder. Are you using Netdiagram V1.0.4 or the version 2 beta?

Stoyan

Click on the link at the top of this page to get to the private messages page. There you will find an updated jdiagram.jar that adds a createPathFinder method. Thanks for the suggestion, but for consistency the new method will stay in ScriptHelper for now 8)

Now you can handle the ArrowModifying and ArrowCreating events, and use PathFinder together with FlowChart.getBoxAt() to find out whether there is a path from the would-be-destination to the origin. That would lead to a cycle if the arrow is created / modified at that location, so you return false from the handler.

I hope that helps,
Stoyan