I am coming back to the issue of zOrder.

Here is a little example:

view shape label text: #yourself.
view nodes: (1 to: 20).
view edges: (1 to: 20) from: [:x | x // 2] to: 1.
view edges: (1 to: 20) from: [:x | x // 3] to: 2.
view edges: (1 to: 20) from: [:x | x // 5] to: #yourself.
view edges: (1 to: 20) from: [:x | x // 7] to: #yourself.
view dominanceTreeLayout

Open this one is Mondrian and then in the Roassal Easel (see attached screenshots).

Then, try to select 1.

In Roassal, you cannot select 1 because of the edges that go on top of it. What is more, you also can barely see it. This situation will always appear in graphs with edges that cross the nodes.

Given that at least the MondrianViewBuilder should be about mapping domain models onto graphs, having a sensible zOrder, at least in the MondrianViewBuilder is important.

Doru