Use graphviz to render graph instead of matplotlib

It looks better

cli.py

@@ -1,10 +1,11 @@
 import click
 import json
-import matplotlib
-matplotlib.use('Agg')  # don't show windows
-import matplotlib.pyplot as plt
+#import matplotlib
+#matplotlib.use('Agg')  # don't show windows
+#import matplotlib.pyplot as plt
 import networkx as nx
 import os
+import subprocess
 
 from x import actions as xa
 from x import deployment as xd
@@ -146,12 +147,17 @@ def init_cli_connections():
     @click.command()
     def graph():
         g = xs.connection_graph()
-        pos = nx.spring_layout(g)
-        nx.draw_networkx_nodes(g, pos)
-        nx.draw_networkx_edges(g, pos, arrows=True)
-        nx.draw_networkx_labels(g, pos)
-        plt.axis('off')
-        plt.savefig('graph.png')
+
+        nx.write_dot(g, 'graph.dot')
+        subprocess.call(['dot', '-Tps', 'graph.dot', '-o', 'graph.ps'])
+
+        # Matplotlib
+        #pos = nx.spring_layout(g)
+        #nx.draw_networkx_nodes(g, pos)
+        #nx.draw_networkx_edges(g, pos, arrows=True)
+        #nx.draw_networkx_labels(g, pos)
+        #plt.axis('off')
+        #plt.savefig('graph.png')
 
     connections.add_command(graph)
 

main.yml

@@ -16,7 +16,8 @@
     - shell: pip install -r /vagrant/requirements.txt
 
     # Graph drawing
-    - apt: name=python-matplotlib state=present
+    #- apt: name=python-matplotlib state=present
+    - apt: name=python-graphviz state=present
 
       # Setup development env for solar
     #- shell: python setup.py develop chdir=/vagrant/solar