enhancementhelp wanted
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Description
I wondered whether it would be possible to implement something like "exterior edge routing" to improve the readability of graphs created with the hierarchical edge bundling technique; e.g.
flaregraph <- graph_from_data_frame(flare$edges, vertices = flare$vertices)
from <- match(flare$imports$from, flare$vertices$name)
to <- match(flare$imports$to, flare$vertices$name)
ggraph(flaregraph, layout = 'dendrogram', circular = TRUE) +
geom_conn_bundle(data = get_con(from = from, to = to), alpha = 0.1) +
coord_fixed()
The idea would be to route edges that are part of the same group around the exterior of a "connected circle".
This has, for instance, been used to visualize trade agreements between countries in different "trading blocks": http://ftavis.com/