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#!/usr/bin/env python
"""
=============
Write Dotfile
=============
Write a dot file from a networkx graph for further processing with graphviz.
You need to have either pygraphviz or pydot for this example.
See https://networkx.github.io/documentation/latest/reference/drawing.html
for more info.
"""
# Author: Aric Hagberg (hagberg@lanl.gov)
# Copyright (C) 2004-2018 by
# Aric Hagberg <hagberg@lanl.gov>
# Dan Schult <dschult@colgate.edu>
# Pieter Swart <swart@lanl.gov>
# All rights reserved.
# BSD license.
import networkx as nx
# and the following code block is not needed
# but we want to see which module is used and
# if and why it fails
try:
import pygraphviz
from networkx.drawing.nx_agraph import write_dot
print("using package pygraphviz")
except ImportError:
try:
import pydot
from networkx.drawing.nx_pydot import write_dot
print("using package pydot")
except ImportError:
print()
print("Both pygraphviz and pydot were not found ")
print("see https://networkx.github.io/documentation/latest/reference/drawing.html")
print()
raise
G = nx.grid_2d_graph(5, 5) # 5x5 grid
write_dot(G, "grid.dot")
print("Now run: neato -Tps grid.dot >grid.ps")
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