This should not belong to the layout I have the impression. Where to position the camera
against the nodes the view contains is the real question in my opinion. Probably that
the other layout are not doing it in the right way. 

I have added ROFocusView class>>centerView:
The Mondrian builder has been updated accordingly.
For example:
-=-=-=-=-=-=-=-=-=
view nodes: (Collection withAllSubclasses).
view edgesFrom: #superclass.
view radialTreeLayout.
view center.   
-=-=-=-=-=-=-=-=-=

produces what is expected.

In Roassal 1.356.
Doru, if you agree with this, then close the issue.

I think the ability to center the view is nice, but it does not solve the layout problem.

The layout positions nodes. So, there is no reason why the layout should not start
positioning nodes at 0@0. And there is no reason for the default camera to not start
at 0@0.

Or am I wrong?

Any taker? :)

Actually, I think the radial tree layout does the right think.  0 @ 0 should be at the
middle of the window. No reason to have it top left corner. 
The way layouts are implemented, prevent them from being composed (e.g., there is no
easy way to layout a tree with a root node that is not in 0 @ 0).

I do not get it. I am talking about the user, not the internal implementation.

I apply the layout, and two thirds of the graph cannot be seen. How is that the right
thing?

The only thing that would be required would be to perform a translation of the whole
graph (or maybe only of the camera) after the layout algorithm finished. This would
be a linear algorithm depending on the number of nodes.

Ping? :)

Mathieu and I are working on this... We will need a few days more...

Sorry to have been that slow on this.

| rawView nodes edges |
rawView := ROView new.

nodes := (ROEllipse gray size: 10) elementsOn: Collection withAllSubclasses.

nodes do: [ :n | n @ RODraggable ].

rawView addAll: nodes.

edges := ROLine buildEdgesFromElements: nodes from: #superclass to: #yourself.

rawView addAll: edges. 

RORadialTreeLayout new 
    "translator: (ROSmoothLayoutTranslator new nbCycles: 10);"
    applyOn: nodes.
rawView openInWindowSized: 1000 @ 600. 

Forgot to say this is now fixed in Roassal 1.458

Great!