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"""
Atlas
=====
An example showing how to write first 20 graphs from the graph atlas as
graphviz dot files Gn.dot where n=0,19.
TODO: does nx_agraph.draw support multiple graphs in one png?
"""
import networkx as nx
atlas = nx.graph_atlas_g()[0:20]
for G in atlas:
print(G)
A = nx.nx_agraph.to_agraph(G)
A.graph_attr["label"] = G.name
# set default node attributes
A.node_attr["color"] = "red"
A.node_attr["style"] = "filled"
A.node_attr["shape"] = "circle"
A.write(G.name + ".dot")
# Draw the 20th graph from the atlas to png
A.draw("A20.png", prog="neato")
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