diff -r d5e2007c01d8 -r a4a575e755aa server/python/django/renkanmanager/utils.py
--- a/server/python/django/renkanmanager/utils.py	Tue Aug 26 16:06:55 2014 +0200
+++ b/server/python/django/renkanmanager/utils.py	Tue Aug 26 18:03:42 2014 +0200
@@ -10,6 +10,7 @@
 from django.shortcuts import get_object_or_404
 from django.utils.encoding import smart_str
 from renkanmanager.models import Renkan
+import math
 import md5
 import re
 import uuid
@@ -60,21 +61,23 @@
             offset = float(self.max_length - nb) / 2
             for i in xrange(nb):
                 self.cat_nb_nodes[c].append({ "x": order*500, "y": 100*(i+offset) })
-        #logger.debug(self.cat_nb_nodes)
 
 
 
 class CircleNodePlacer(NodePlacer):
-    #TODO: Does not work. Meant to be a real circle placer
+    
     def init(self, cat_nb_nodes_initial):
-        for c in cat_nb_nodes_initial:
-            self.max_length = cat_nb_nodes_initial[c] if cat_nb_nodes_initial[c] > self.max_length else self.max_length
         for i_cat,c in enumerate(cat_nb_nodes_initial):
             self.cat_nb_nodes[c] = []
-            offset = float(self.max_length - cat_nb_nodes_initial[c]) / 2
-            for i in xrange(cat_nb_nodes_initial[c]):
-                self.cat_nb_nodes[c].append({ "x": i_cat*400, "y": 200*(i+offset) })
-        #logger.debug(self.cat_nb_nodes)
+            order = i_cat
+            nb = cat_nb_nodes_initial[c]
+            if isinstance(cat_nb_nodes_initial[c], tuple):
+                order, nb = nb
+            order -= 1
+            for i in xrange(nb):
+                radius = (order*500) if order>0 else 100
+                angle = 2 * math.pi * i / nb
+                self.cat_nb_nodes[c].append({ "x": radius*math.cos(angle), "y": radius*math.sin(angle) })