diff --git a/panoramix/static/widgets/viz_world_map.js b/panoramix/static/widgets/viz_world_map.js
index 0ae8799d95a2..998ae4742866 100644
--- a/panoramix/static/widgets/viz_world_map.js
+++ b/panoramix/static/widgets/viz_world_map.js
@@ -6,6 +6,7 @@ function viz_world_map(slice) {
   var render = function() {
     var container = slice.container;
     var div = d3.select(slice.selector);
+    container.css('height', slice.height());
 
     d3.json(slice.jsonEndpoint(), function(error, json){
       var fd = json.form_data;
diff --git a/panoramix/utils.py b/panoramix/utils.py
index 0334d91aee64..70c8146a1c5e 100644
--- a/panoramix/utils.py
+++ b/panoramix/utils.py
@@ -12,6 +12,7 @@
 from panoramix import db
 
 
+
 class memoized(object):
    """Decorator that caches a function's return value each time it is called.
    If called later with the same arguments, the cached value is returned, and
@@ -104,22 +105,16 @@ def process_result_value(self, value, dialect):
         return value
 
 
-def color(s):
-    """
-    Get a consistent color from the same string using a hash function
-
-    >>> color("foo")
-    '#FF5A5F'
-    """
-    colors = [
+class ColorFactory(object):
+    BNB_COLORS = [
         "#007A87",
         "#00D1C1",
-        "#4EDED2",
-        "#4FA3AB",
         "#565A5C",
         "#7B0051",
         "#898C8C",
         "#8CE071",
+        "#4EDED2",
+        "#4FA3AB",
         "#9CA299",
         "#A14D83",
         "#B4A76C",
@@ -130,10 +125,27 @@ def color(s):
         "#FFC4B3",
         "#FFCA4F",
     ]
-    s = s.encode('utf-8')
-    h = hashlib.md5(s)
-    i = int(h.hexdigest(), 16)
-    return colors[i % len(colors)]
+
+    def __init__(self, hash_based=True):
+        self.d = {}
+        self.hash_based = hash_based
+
+    def get(self, s):
+        """
+        Get a consistent color from the same string using a hash function
+
+        >>> color("foo")
+        '#FF5A5F'
+        """
+        if self.hash_based:
+            s = s.encode('utf-8')
+            h = hashlib.md5(s)
+            i = int(h.hexdigest(), 16)
+        else:
+            if s not in self.d:
+                self.d[s] = len(self.d)
+            i = self.d[s]
+        return self.BNB_COLORS[i % len(self.BNB_COLORS)]
 
 
 def init():
diff --git a/panoramix/viz.py b/panoramix/viz.py
index e2cfb7214560..1ffffa33bc5b 100644
--- a/panoramix/viz.py
+++ b/panoramix/viz.py
@@ -532,10 +532,11 @@ def get_json_data(self):
         for row in df.to_dict(orient='records'):
             series[row['group']].append(row)
         chart_data = []
+        cf = utils.ColorFactory()
         for k, v in series.items():
             chart_data.append({
                 'key': k,
-                "color": utils.color(str(k)),
+                "color": cf.get(str(k)),
                 'values': v })
         return dumps(chart_data)
 
@@ -691,6 +692,7 @@ def to_series(self, df, classed='', title_suffix=''):
         series = df.to_dict('series')
 
         chart_data = []
+        cf = utils.ColorFactory()
         for name in df.T.index.tolist():
             ys = series[name]
             if df[name].dtype.kind not in "biufc":
@@ -704,7 +706,7 @@ def to_series(self, df, classed='', title_suffix=''):
                     series_title = ", ".join(name)
                 else:
                     series_title = ", ".join(name[1:])
-            color = utils.color(series_title)
+            color = cf.get(series_title)
             if title_suffix:
                 series_title += title_suffix
 
@@ -810,7 +812,8 @@ def get_json_data(self):
         df = self.get_df()
         df = df.reset_index()
         df.columns = ['x', 'y']
-        df['color'] = map(utils.color, df.x)
+        cf = utils.ColorFactory()
+        df['color'] = map(cf.get, df.x)
         return dumps(df.to_dict(orient="records"))
 
 
@@ -852,9 +855,10 @@ def get_json_data(self):
                 series_title = ", ".join(name)
             else:
                 series_title = ", ".join(name[1:])
+            cf = utils.ColorFactory()
             d = {
                 "key": series_title,
-                "color": utils.color(series_title),
+                "color": cf.get(series_title),
                 "values": [
                     {'x': ds, 'y': ys[i]}
                     for i, ds in enumerate(df.timestamp)]