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"""
Attributes
----------
Example illustrating how to set node, edge, and graph attributes for
visualization.
"""
import pygraphviz as pgv
# strict (no parallel edges)
# digraph
# with attribute rankdir set to 'LR'
A = pgv.AGraph(directed=True, strict=True, rankdir="LR")
# add node 1 with color red
A.add_node(1, color="red")
A.add_node(5, color="blue")
# add some edges
A.add_edge(1, 2, color="green")
A.add_edge(2, 3)
A.add_edge(1, 3)
A.add_edge(3, 4)
A.add_edge(3, 5)
A.add_edge(3, 6)
A.add_edge(4, 6)
# adjust a graph parameter
A.graph_attr["epsilon"] = "0.001"
print(A.string()) # print dot file to standard output
A.layout("dot") # layout with dot
A.draw("foo.png") # write to file
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