#!/usr/bin/env python
"""
Draw a graph with matplotlib.
You must have matplotlib for this to work.
"""
# Author: Aric Hagberg (hagberg@lanl.gov)
# Copyright (C) 2004-2016
# Aric Hagberg <hagberg@lanl.gov>
# Dan Schult <dschult@colgate.edu>
# Pieter Swart <swart@lanl.gov>
# All rights reserved.
# BSD license.
try:
import matplotlib.pyplot as plt
except:
raise
import networkx as nx
G=nx.grid_2d_graph(4,4) #4x4 grid
pos=nx.spring_layout(G,iterations=100)
plt.subplot(221)
nx.draw(G,pos,font_size=8)
plt.subplot(222)
nx.draw(G,pos,node_color='k',node_size=0,with_labels=False)
plt.subplot(223)
nx.draw(G,pos,node_color='g',node_size=250,with_labels=False,width=6)
plt.subplot(224)
H=G.to_directed()
nx.draw(H,pos,node_color='b',node_size=20,with_labels=False)
plt.savefig("four_grids.png")
plt.show()
