diff --git a/demo/moulinrouge/__init__.py b/demo/moulinrouge/__init__.py
index 5d87fc8..3e4a8e3 100644
--- a/demo/moulinrouge/__init__.py
+++ b/demo/moulinrouge/__init__.py
@@ -117,7 +117,7 @@ def create_app():
         config = Config()
         config.width = width
         config.height = height
-        config.fill = True
+        config.fill = bool(random.randrange(0, 2))
         config.human_readable = True
         config.style = styles[style]
         config.x_labels = [random_label() for i in range(data)]
@@ -148,7 +148,7 @@ def create_app():
         series = b64encode(pickle.dumps(_random_series(type, data, order)))
         labels = [random_label() for i in range(data)]
         svgs = []
-        config.show_legend = bool(random.randrange(0, 1))
+        config.show_legend = bool(random.randrange(0, 2))
         for angle in range(0, 91, 5):
             config.title = "%d rotation" % angle
             config.x_labels = labels
diff --git a/pygal/__init__.py b/pygal/__init__.py
index e5bcbe0..dca6d8a 100644
--- a/pygal/__init__.py
+++ b/pygal/__init__.py
@@ -16,7 +16,7 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with pygal. If not, see <http://www.gnu.org/licenses/>.
-__version__ = '0.9.11'
+__version__ = '0.9.12'
 from collections import namedtuple
 
 from pygal.graph.bar import Bar
diff --git a/pygal/config.py b/pygal/config.py
index c837c53..e341143 100644
--- a/pygal/config.py
+++ b/pygal/config.py
@@ -88,6 +88,8 @@ class Config(object):
     print_values = True
     # Print zeroes when graph is in non interactive mode
     print_zeroes = False
+    # Animate tooltip steps (0 disable animation)
+    animation_steps = 0
 
     def __init__(self, **kwargs):
         """Can be instanciated with config kwargs"""
diff --git a/pygal/css/graph.css b/pygal/css/graph.css
index 712d331..30c32c7 100644
--- a/pygal/css/graph.css
+++ b/pygal/css/graph.css
@@ -117,9 +117,9 @@ text.no_data {
 }
 
 .axis.y .guides:hover .guide.line,
-.Line .axis.x .guides:hover .guide.line,
-.StackedLine .axis.x .guides:hover .guide.line,
-.XY .axis.x .guides:hover .guide.line {
+.line-graph .axis.x .guides:hover .guide.line,
+.stackedline-graph .axis.x .guides:hover .guide.line,
+.xy-graph .axis.x .guides:hover .guide.line {
   stroke: {{ style.foreground_light }};
   opacity: 1;
 }
diff --git a/pygal/graph/base.py b/pygal/graph/base.py
index 5a6de84..8b1869d 100644
--- a/pygal/graph/base.py
+++ b/pygal/graph/base.py
@@ -39,6 +39,8 @@ class BaseGraph(object):
     def _pos(self, min_, max_, scale, min_scale=4, max_scale=20):
         if min_ == 0 and max_ == 0:
             return [0]
+        if max_ - min_ == 0:
+            return [min_]
         if self.logarithmic:
             return self._pos_logarithmic(min_, max_)
         order = round(log10(max(abs(min_), abs(max_)))) - 1
@@ -143,3 +145,7 @@ class BaseGraph(object):
     def render_response(self):
         from flask import Response
         return Response(self.render(), mimetype='image/svg+xml')
+
+    def render_to_file(self, filename):
+        with open(filename, 'w') as f:
+            f.write(self.render())
diff --git a/pygal/graph/graph.py b/pygal/graph/graph.py
index f248387..66e157c 100644
--- a/pygal/graph/graph.py
+++ b/pygal/graph/graph.py
@@ -22,7 +22,7 @@ class Graph(BaseGraph):
 
     def _make_graph(self):
         self.graph_node = self.svg.node(
-            class_='graph %s' % self.__class__.__name__)
+            class_='graph %s-graph' % self.__class__.__name__.lower())
         self.svg.node(self.graph_node, 'rect',
                   class_='background',
                   x=0, y=0,
@@ -51,19 +51,6 @@ class Graph(BaseGraph):
                 self.margin.left, self.margin.top))
         self.tooltip_node = self.svg.node(tooltip_overlay, id="tooltip",
                                           transform='translate(0 0)')
-        # self.svg.node(
-        #     self.tooltip_node, 'animateTransform',
-        #     id="tooltip-slide",
-        #     attributeName='transform',
-        #     attributeType='XML',
-        #     type='translate',
-        #     calcMode='spline',
-        #     dur='100ms',
-        #     end='indefinite',
-        #     begin='indefinite',
-        #     from_="0 0",
-        #     to="100 100",
-        #     fill='freeze')
 
         self.svg.node(self.tooltip_node, 'rect',
                       id="tooltip-box",
diff --git a/pygal/js/graph.coffee b/pygal/js/graph.coffee
index 85a2aa7..388fcdc 100644
--- a/pygal/js/graph.coffee
+++ b/pygal/js/graph.coffee
@@ -3,6 +3,7 @@ __ = (x) -> document.getElementById(x)
 padding = 5
 tooltip_timeout = 0
 tooltip_font_size = parseInt("{{ font_sizes.tooltip }}")
+anim_steps = parseInt("{{ animation_steps }}")
 
 class Queue
     constructor: (@delay) ->
@@ -32,7 +33,7 @@ class Queue
             @queue = []
             @running = false
 
-tooltip_anim_Q = new Queue 1
+tooltip_anim_Q = new Queue 100
 
 has_class = (e, class_name) ->
     return if not e
@@ -106,19 +107,19 @@ tooltip = (elt) ->
 
     [current_x, current_y] = (parseInt(s) for s in _tooltip.getAttribute('transform').replace('translate(', '').replace(')', '').split ' ')
     return if current_x == x and current_y == y
-    step = 12
-    x_step = (x - current_x) / step
-    y_step = (y - current_y) / step
-    anim_x = current_x
-    anim_y = current_y
-    for i in [0..step]
-        anim_x += x_step
-        anim_y += y_step
-        tooltip_anim_Q.add ((_x, _y) ->
-            _tooltip.setAttribute('transform', "translate(#{_x} #{_y})")), anim_x, anim_y
-    tooltip_anim_Q.add ((_x, _y) ->
-        _tooltip.setAttribute('transform', "translate(#{_x} #{_y})")), x, y
-
+    if anim_steps
+        x_step = (x - current_x) / (anim_steps + 1)
+        y_step = (y - current_y) / (anim_steps + 1)
+        anim_x = current_x
+        anim_y = current_y
+        for i in [0..anim_steps]
+            anim_x += x_step
+            anim_y += y_step
+            tooltip_anim_Q.add ((_x, _y) ->
+                _tooltip.setAttribute('transform', "translate(#{_x} #{_y})")), anim_x, anim_y
+        tooltip_anim_Q.add -> _tooltip.setAttribute('transform', "translate(#{x} #{y})")
+    else
+        _tooltip.setAttribute('transform', "translate(#{x} #{y})")
 
 untooltip = ->
     tooltip_timeout = setTimeout (->
diff --git a/pygal/js/graph.js b/pygal/js/graph.js
index 37c93b6..1f03362 100644
--- a/pygal/js/graph.js
+++ b/pygal/js/graph.js
@@ -1,6 +1,6 @@
 // Generated by CoffeeScript 1.2.1-pre
 (function() {
-  var Queue, activate, add_class, deactivate, has_class, height, hover, padding, rm_class, svg, tooltip, tooltip_anim_Q, tooltip_font_size, tooltip_timeout, untooltip, width, _, __,
+  var Queue, activate, add_class, anim_steps, deactivate, has_class, height, hover, padding, rm_class, svg, tooltip, tooltip_anim_Q, tooltip_font_size, tooltip_timeout, untooltip, width, _, __,
     __slice = [].slice;
 
   _ = function(x) {
@@ -17,6 +17,8 @@
 
   tooltip_font_size = parseInt("{{ font_sizes.tooltip }}");
 
+  anim_steps = parseInt("{{ animation_steps }}");
+
   Queue = (function() {
 
     Queue.name = 'Queue';
@@ -67,7 +69,7 @@
 
   })();
 
-  tooltip_anim_Q = new Queue(1);
+  tooltip_anim_Q = new Queue(100);
 
   has_class = function(e, class_name) {
     var cls, cn, i, _i, _len;
@@ -153,7 +155,7 @@
   };
 
   tooltip = function(elt) {
-    var anim_x, anim_y, current_x, current_y, h, i, s, step, value, w, x, x_elt, x_step, y, y_elt, y_step, _i, _rect, _ref, _text, _tooltip;
+    var anim_x, anim_y, current_x, current_y, h, i, s, value, w, x, x_elt, x_step, y, y_elt, y_step, _i, _rect, _ref, _text, _tooltip;
     tooltip_anim_Q.clear();
     clearTimeout(tooltip_timeout);
     _tooltip = __('tooltip');
@@ -185,21 +187,24 @@
       return _results;
     })(), current_x = _ref[0], current_y = _ref[1];
     if (current_x === x && current_y === y) return;
-    step = 12;
-    x_step = (x - current_x) / step;
-    y_step = (y - current_y) / step;
-    anim_x = current_x;
-    anim_y = current_y;
-    for (i = _i = 0; 0 <= step ? _i <= step : _i >= step; i = 0 <= step ? ++_i : --_i) {
-      anim_x += x_step;
-      anim_y += y_step;
-      tooltip_anim_Q.add((function(_x, _y) {
-        return _tooltip.setAttribute('transform', "translate(" + _x + " " + _y + ")");
-      }), anim_x, anim_y);
+    if (anim_steps) {
+      x_step = (x - current_x) / (anim_steps + 1);
+      y_step = (y - current_y) / (anim_steps + 1);
+      anim_x = current_x;
+      anim_y = current_y;
+      for (i = _i = 0; 0 <= anim_steps ? _i <= anim_steps : _i >= anim_steps; i = 0 <= anim_steps ? ++_i : --_i) {
+        anim_x += x_step;
+        anim_y += y_step;
+        tooltip_anim_Q.add((function(_x, _y) {
+          return _tooltip.setAttribute('transform', "translate(" + _x + " " + _y + ")");
+        }), anim_x, anim_y);
+      }
+      return tooltip_anim_Q.add(function() {
+        return _tooltip.setAttribute('transform', "translate(" + x + " " + y + ")");
+      });
+    } else {
+      return _tooltip.setAttribute('transform', "translate(" + x + " " + y + ")");
     }
-    return tooltip_anim_Q.add((function(_x, _y) {
-      return _tooltip.setAttribute('transform', "translate(" + _x + " " + _y + ")");
-    }), x, y);
   };
 
   untooltip = function() {
diff --git a/pygal/svg.py b/pygal/svg.py
index 2bc8c24..90320f1 100644
--- a/pygal/svg.py
+++ b/pygal/svg.py
@@ -59,8 +59,10 @@ class Svg(object):
         script = self.node(self.root, 'script', type='text/javascript')
         with open(js) as f:
             templ = template(
-                 f.read(),
-                font_sizes=self.graph.font_sizes(False))
+                f.read(),
+                font_sizes=self.graph.font_sizes(False),
+                animation_steps=self.graph.animation_steps
+            )
             script.text = templ.decode('utf-8')
 
     def node(self, parent=None, tag='g', attrib=None, **extras):
diff --git a/pygal/test/test_graph.py b/pygal/test/test_graph.py
new file mode 100644
index 0000000..258741b
--- /dev/null
+++ b/pygal/test/test_graph.py
@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+# This file is part of pygal
+#
+# A python svg graph plotting library
+# Copyright © 2012 Kozea
+#
+# This library is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# This library is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with pygal. If not, see <http://www.gnu.org/licenses/>.
+import os
+from pygal import Line
+
+
+def test_render_to_file():
+    file_name = '/tmp/test_graph.svg'
+    if os.path.exists(file_name):
+        os.remove(file_name)
+
+    line = Line()
+    line.add('Serie 1', [1])
+    line.render_to_file(file_name)
+    with open(file_name) as f:
+        assert 'pygal' in f.read()
+    os.remove(file_name)