Add ability to color and label edges.

example.json

@@ -8,12 +8,12 @@
   ],
 
   "relationships": [
-    ["Sam", "Max", "solid"],
-    ["Sam", "Eve", "solid"],
-    ["Max", "Eve", "solid"],
-    ["Sam", "Bob", "solid"],
-    ["Alice", "Bob", "dashed"],
-    ["Alice", "Charles", "solid"],
-    ["Charles", "Max", "dashed"]
+    {"members": ["Sam", "Max"]},
+    {"members": ["Sam", "Eve"], "color": "red"},
+    {"members": ["Max", "Eve"], "label": "friends+"},
+    {"members": ["Sam", "Bob"], "color": "yellow", "label": "cuddle friends"},
+    {"members": ["Alice", "Bob"], "style": "dashed"},
+    {"members": ["Alice", "Charles"]},
+    {"members": ["Charles", "Max"]}
   ]
 }

polygraph.py

@@ -35,11 +35,19 @@ def main():
         graph.add_node(user['name'], fillcolor=node_color)
 
     # Add edges to graph
-    edge_style = 'solid'
+    for relationship in data['relationships']:
+        edge_style = 'solid'
+        if relationship.has_key('style'): edge_style = relationship['style']
+        edge_color = 'black'
+        if relationship.has_key('color'): edge_color = relationship['color']
+        edge_label = None
+        if relationship.has_key('label'): edge_label = relationship['label']
 
-    for (member1,member2,edge) in data['relationships']:
-        edge_style = edge
-        graph.add_edge(member1, member2, style=edge_style, color='black')
+        member0 = relationship['members'][0]
+        member1 = relationship['members'][1]
+        graph.add_edge(member0, member1, style=edge_style, color=edge_color)
+        if edge_label is not None:
+            graph.get_edge(member0, member1).attr['label'] = edge_label
 
     graph.layout()
     graph.draw(settings.output)