Here's a hackish solution I got by digging into the graph_plot sourcecode:
http://git.sagemath.org/sage.git/tree/src/sage/graphs/graph_plot.py
The relevant lines are 424 - 426.
I created a GraphPlot object and modified the labels there instead of in
the original graph.
G=DiGraph({0:[1,2]})
Gplot = G.graphplot()
# Extract relevant components
node_list = Gplot._nodelist
pos_dict = Gplot._pos
# Define list or dict of labels (same length as node_list)
label_list = ["Ho","Hi","Hi"]
# Modify vertex labels
Gplot._plot_components['vertex_labels'] = [text(label, pos_dict[node],
rgbcolor=(0,0,0), zorder=8) for node,label in zip(node_list,label_list)]
Gplot.show()
You could probably condense it into a two or three liner.
It seems like it should also be possible to label vertices with non-text as
well (e.g. other graphics components).
Regards,
Ze
On Tuesday, October 14, 2014 2:50:05 AM UTC-7, Jori Mantysalo wrote:
>
> On Tue, 14 Oct 2014, Nathann Cohen wrote:
>
> >> G=DiGraph({0:[1,2]})
> >> G.set_edge_label(0,1,'Hi!')
> >> G.set_edge_label(0,2,'Hi!')
> >>
> >> (But ".relabel(lambda e: ...)" -syntax is easier, I think.)
> >
> > Yes but we can't do the same for the vertices of a graph, of we would
> > have no way to differentiate them afterwards. It should really be a
> > plot parameter.
>
> That was what I was thinking. I don't know if "relabel" is good name for
> parameter of plot(). Maybe not.
>
> --
> Jori Mäntysalo
>
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