Does anyone know if it is possible to have fine-grained control over line properties when drawing networkx edges via (for example) draw_networkx_edges? I would like to control the line solid_capstyle and solid_joinstyle, which are (matplotlib) Line2D properties.

>>> import networkx as nx
>>> import matplotlib.pyplot as plt
>>> G = nx.dodecahedral_graph()
>>> edges = nx.draw_networkx_edges(G, pos=nx.spring_layout(G), width=7)
>>> plt.show()

In the example above, there are 'gaps' between the edges which I'd like to hide by controlling the capstyle. I thought about adding the nodes at just the right size to fill in the gaps, but the edges in my final plot are coloured, so adding nodes won't cut it. I can't figure out from the documentation or looking at edges.properties() how to do what I want to do... any suggestions?

Carson

It looks like you can't set the capstyle on matplotlib line collections.

But you can make your own collection of edges using Line2D objects which allows you to control the capstyle:

import networkx as nx
import matplotlib.pyplot as plt
from matplotlib.lines import Line2D
G = nx.dodecahedral_graph()
pos = nx.spring_layout(G)
ax = plt.gca()
for u,v in G.edges():x = [pos[u][0],pos[v][0]]y = [pos[u][1],pos[v][1]]l = Line2D(x,y,linewidth=8,solid_capstyle='round')ax.add_line(l)
ax.autoscale()
plt.show()