diff --git a/demo/moulinrouge/__init__.py b/demo/moulinrouge/__init__.py
index 929ccdc..3bbada2 100644
--- a/demo/moulinrouge/__init__.py
+++ b/demo/moulinrouge/__init__.py
@@ -36,8 +36,8 @@ def create_app():
     def index():
         return render_template('index.jinja2')
 
-    @app.route("/all-<type>-<style>.svg")
-    def all_svg(type, style):
+    @app.route("/all-<type>-<style>(fill=<fill>).svg")
+    def all_svg(type, style, fill):
         data = random.randrange(1, 10)
         order = random.randrange(1, 10)
         max = 10 ** order
@@ -45,6 +45,7 @@ def create_app():
         config = Config()
         config.width = 600
         config.height = 400
+        config.fill = fill == 'True'
         config.style = styles[style]
         if type != 'Pie':
             config.x_labels = [random_label() for i in range(data)]
@@ -68,8 +69,9 @@ def create_app():
     @app.route("/all")
     def all():
         width, height = 600, 400
-        svgs = [url_for('all_svg', type=type, style=style)
+        svgs = [url_for('all_svg', type=type, style=style, fill=fill)
                 for style in styles
+                for fill in (False, True)
                 for type in ('Bar', 'Line', 'XY', 'Pie', 'StackedBar',
                           'HorizontalBar', 'HorizontalStackedBar', 'Radar')]
         return render_template('svgs.jinja2',
diff --git a/out.py b/out.py
index ba63be4..7d7ace1 100755
--- a/out.py
+++ b/out.py
@@ -88,7 +88,7 @@ config.x_labels = (
     'black', 'red', 'blue', 'yellow', 'orange', 'green', 'white')
 radar = Radar(config)
 radar.add('test', [1, 4, 1, 5, 7, 2, 5])
-radar.add('test2', [10, 2, 0, 5, 1, 9, 4])
+radar.add('test2', [10, 2, 7, 5, 1, 9, 4])
 
 radar.title = "Radar test"
 with open('out-radar.svg', 'w') as f:
diff --git a/pygal/graph/base.py b/pygal/graph/base.py
index 9bcf856..dad7cbf 100644
--- a/pygal/graph/base.py
+++ b/pygal/graph/base.py
@@ -23,12 +23,12 @@ class BaseGraph(object):
             return object.__getattribute__(self.config, attr)
         return object.__getattribute__(self, attr)
 
-    def _pos(self, min_, max_, scale):
+    def _pos(self, min_, max_, scale, min_scale=4, max_scale=20):
         order = round(log10(max(abs(min_), abs(max_)))) - 1
-        while (max_ - min_) / float(10 ** order) < 4:
+        while (max_ - min_) / float(10 ** order) < min_scale:
             order -= 1
         step = float(10 ** order)
-        while (max_ - min_) / step > 20:
+        while (max_ - min_) / step > max_scale:
             step *= 2.
         positions = set()
         if self.x_start_at_zero:
diff --git a/pygal/graph/radar.py b/pygal/graph/radar.py
index 9d93e4b..7df97be 100644
--- a/pygal/graph/radar.py
+++ b/pygal/graph/radar.py
@@ -70,7 +70,8 @@ class Radar(Line):
         x_step = len(self.series[0].values)
         delta = 2 * pi / float(len(self.x_labels))
         self._x_pos = [.5 * pi - i * delta for i in range(x_step)]
-        self._y_pos = self._pos(self._box.ymin, self._box.ymax, self.y_scale
+        self._y_pos = self._pos(
+            self._box.ymin, self._box.ymax, self.y_scale, max_scale=8
         ) if not self.y_labels else map(int, self.y_labels)
         self._x_labels = self.x_labels and zip(self.x_labels, self._x_pos)
         self._y_labels = zip(map(str, self._y_pos), self._y_pos)
diff --git a/pygal/svg.py b/pygal/svg.py
index 41f4363..4fa58b6 100644
--- a/pygal/svg.py
+++ b/pygal/svg.py
@@ -2,7 +2,6 @@
 import os
 from lxml import etree
 from pygal.util import template
-from math import cos, sin, pi
 
 
 class Svg(object):