Make "star" layout the default for when plotting ego networks with `graphs()`

[henriquesposito]

Ideally the default layout for a netlist of ego networks should be concentric layouts with the ego appearing in the centre and nodes @dist1 arrayed around the next level and any nodes @dist2 at the next circle beyond that...

[jhollway]

How will it know that the list of networks is of ego networks?

[jhollway]

Suggestions for how to solve each of these two issues:

• it can recognise it is a list of ego networks if the list elements are named and all names appear among the names of the nodes in the networks
• using "star" will place a node in the centre with the others arrayed around it

[henriquesposito]

This has been implemented, thank you for the suggestions, they were very helpful. graphs() now identifies ego networks automatically and uses the "star" layout (and centers plot on correct ego). See examples below:

# automatic
graphs(to_egos(ison_adolescents), waves = 1:8, node_size = 1)
# when "star" layout is declared uses `{igraph}` defaults, that is, centers on first node
graphs(to_egos(ison_adolescents), waves = 1:8, layout = "star", node_size = 1) 
# when ego network is not identified, defaults to stress layout
graphs(unname(to_egos(ison_adolescents)), waves = 1:8, node_size = 1)
graphs(to_egos(ison_adolescents), waves = 1:8, layout = "stress", node_size = 1)

[jhollway]

Thanks Henrique. What about other 'splits'?

graphs(to_subgraphs(ison_lotr, "Race"), waves = 1:4, node_size = 1)
Layouts were not standardised since not all nodes appear across waves.
Warning message:
In order_alphabetically(names(netlist)) == order_alphabetically(unique(unlist(unname(lapply(netlist,  :
  longer object length is not a multiple of shorter object length

[jhollway]

Also, it seems that if ego's network only contains one other node, ego is not centred within the plotting space? In my case, some of the distances to alters don't seem equal either.

Otherwise I really like how the naming is used.