Hi Fabrice, I am not sure what you actually need. Why do you find the edges too short? Currently we cannot set the length of edges. This will come soon, but right now we cannot. If you want to minimize crossing, then there are two solutions: - use a sugyama layout: RTSugiyamaLayout - use the force based Layout. Execute in a workspace: RTRoassalExample new exampleForceBasedLayoutAnimated Let us know how it goes... Cheers, Alexandre On Jun 7, 2014, at 5:18 PM, Fabrice Atrevi <atrevifabrice(a)gmail.com> wrote: -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.