You do not need edges actually for the force based layout. Consider this example:

-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. On Apr 23, 2014, at 5:41 PM, Johan Fabry jfabry@dcc.uchile.cl wrote: > > Ok, thanks for the help. Playing with the length instvar of the layout solved my problem of having the nodes too close together. > > On Apr 23, 2014, at 4:43 PM, Alexandre Bergel alexandre.bergel@me.com wrote: > >>> I am having an issue with setting up a Roassal layout. I guess that to make force based layouts work, I have to add the line >>> >>> view edges do: [ :e | e trachelShape pushBack ]. >> >> This has the effect of moving the edges back in the view. Nodes will therefore appear in front of the edges. >> >> You do not need edges actually for the force based layout. Consider this example: >> -=-=-=-=-=-=-=-=-= >> | v es | >> v := RTView new. >> es := (RTEllipse new size: 20; color: (Color blue alpha: 0.4)) elementsOn: (1 to: 30). >> v addAll: es. >> RTForceBasedLayout on: es. >> v >> -=-=-=-=-=-=-=-=-= >> >> <Screen Shot 2014-04-23 at 4.37.59 PM.png> >> >> >>> However when I do this, there is a MNU in TRCompositeShape>>pushback, because the canvas instvar is nil. I am doing what is essentially the following code: >>> >>> “in a loop, adding to an edges collection” >>> edges add: (((RTEdge from: efrom to: eto) + (RTLine new color: color) + (RTArrow new color: color)) @ (RTLabelled new text: trans name; color: color; view: view)). >>> >>> “later" >>> >>> “adding the edges to the view all at once and do layout magic" >>> view addAll: edges. >>> view edges do: [ :e | e trachelShape pushBack ]. “<— MNU” >>> >>> What should I do to fix this? >> >> You’ve found a bug in TRCompositeShape. I’ve just fixed it >> >> Cheers, >> Alexandre >> >>> >>> ---> Save our in-boxes! http://emailcharter.org <--- >>> >>> Johan Fabry - http://pleiad.cl/~jfabry >>> PLEIAD lab - Computer Science Department (DCC) - University of Chile >>> >>> >>> _______________________________________________ >>> Moose-dev mailing list >>> Moose-dev@iam.unibe.ch >>> https://www.iam.unibe.ch/mailman/listinfo/moose-dev >> >> _______________________________________________ >> Moose-dev mailing list >> Moose-dev@iam.unibe.ch >> https://www.iam.unibe.ch/mailman/listinfo/moose-dev > > > > ---> Save our in-boxes! http://emailcharter.org <--- > > Johan Fabry - http://pleiad.cl/~jfabry > PLEIAD lab - Computer Science Department (DCC) - University of Chile > > > _______________________________________________ > Moose-dev mailing list > Moose-dev@iam.unibe.ch > https://www.iam.unibe.ch/mailman/listinfo/moose-dev