Here is another big todo. Layouts need to be composable. 

I often experience the need to have compact visualizations. 

I added a new layout RTPartitionLayout.

Here is an example:

-=-=-=-=-=-=-=-=-=-=-=-=

classes := (RPackageOrganizer default packageNamed: 'Roassal2') definedClasses.
classes := classes copyWithout: RTObject.

b := RTMondrian new.
b nodes: classes.
b edges connectFrom: #superclass.
b normalizer 
normalizeColor: #numberOfLinesOfCode;
normalizeSize: #numberOfMethods.
b layout partition
withinGroup: RTTreeLayout;
forNotConnected: RTGridLayout;
forGroups: RTFlowLayout.
b

-=-=-=-=-=-=-=-=-=-=-=-=