diff --git a/pygal/config.py b/pygal/config.py
index 083393cb..5150a547 100644
--- a/pygal/config.py
+++ b/pygal/config.py
@@ -114,6 +114,8 @@ class Config(object):
     truncate_label = None
     #: Pretty print the svg
     pretty_print = False
+    #: If True don't try to adapt / filter wrong values
+    strict = False
 
     def __init__(self, **kwargs):
         """Can be instanciated with config kwargs"""
diff --git a/pygal/graph/base.py b/pygal/graph/base.py
index e5ab7559..d93edde7 100644
--- a/pygal/graph/base.py
+++ b/pygal/graph/base.py
@@ -48,6 +48,13 @@ def __init__(self, config, series):
         self._box = Box()
         self.view = None
 
+        if self.series and self._has_data():
+            self._draw()
+        else:
+            self.svg.draw_no_data()
+
+        self.svg.pre_render()
+
     def __getattr__(self, attr):
         """Search in config, then in self"""
         if attr in dir(self.config):
@@ -129,11 +136,6 @@ def _max(self):
         """Getter for the maximum series value"""
         return (self.range and self.range[1]) or max(self._values)
 
-    @cached_property
-    def _cumul_max(self):
-        """Getter for the maximum sum of series value"""
-        return max(map(sum, cut(self.series, 'safe_values')))
-
     @cached_property
     def _order(self):
         """Getter for the maximum series value"""
@@ -148,27 +150,13 @@ def _draw(self):
 
     def _has_data(self):
         """Check if there is any data"""
-        if self._order == 0:
-            return False
-        if sum(map(len, map(lambda s: s.values, self.series))) == 0:
-            return False
-        return True
-
-    def _render(self):
-        """Make the graph internally"""
-        if self.series and self._has_data():
-            self._draw()
-            self.svg.pre_render(False)
-        else:
-            self.svg.pre_render(True)
+        return sum(map(len, map(lambda s: s.values, self.series))) != 0
 
     def render(self, is_unicode):
         """Render the graph, and return the svg string"""
-        self._render()
         return self.svg.render(
             is_unicode=is_unicode, pretty_print=self.pretty_print)
 
     def render_tree(self):
         """Render the graph, and return lxml tree"""
-        self._render()
         return self.svg.root
diff --git a/pygal/graph/line.py b/pygal/graph/line.py
index 14f4ff15..ca494d6f 100644
--- a/pygal/graph/line.py
+++ b/pygal/graph/line.py
@@ -41,7 +41,8 @@ def _values(self):
         return  [
             val[1]
             for serie in self.series
-            for val in serie.points
+            for val in (serie.interpolated
+                        if self.interpolate else serie.points)
             if val[1] is not None and (not self.logarithmic or val[1] > 0)]
 
     def _fill(self, values):
@@ -81,6 +82,8 @@ def line(self, serie_node, serie):
                     y + self.value_font_size)
 
         if self.stroke:
+            if self.interpolate:
+                view_values = map(self.view, serie.interpolated)
             if self.fill:
                 view_values = self._fill(view_values)
             self.svg.line(
@@ -93,12 +96,11 @@ def _compute(self):
         ] if self._len != 1 else [.5]  # Center if only one value
 
         for serie in self.series:
+            serie.points = [
+                (x_pos[i], v)
+                for i, v in enumerate(serie.values)]
             if self.interpolate:
-                serie.points = self._interpolate(serie.values, x_pos)
-            else:
-                serie.points = [
-                    (x_pos[i], v)
-                    for i, v in enumerate(serie.values)]
+                serie.interpolated = self._interpolate(serie.values, x_pos)
 
         if self.include_x_axis:
             self._box.ymin = min(self._min, 0)
diff --git a/pygal/graph/radar.py b/pygal/graph/radar.py
index a80055dd..fdf3fb33 100644
--- a/pygal/graph/radar.py
+++ b/pygal/graph/radar.py
@@ -49,7 +49,7 @@ def _get_value(self, values, i):
     def _values(self):
         if self.interpolate:
             return [val[0] for serie in self.series
-                    for val in serie.points]
+                    for val in serie.interpolated]
         else:
             return super(Line, self)._values
 
@@ -109,6 +109,9 @@ def _compute(self):
         delta = 2 * pi / self._len
         x_pos = [.5 * pi + i * delta for i in range(self._len + 1)]
         for serie in self.series:
+            serie.points = [
+                (v, x_pos[i])
+                for i, v in enumerate(serie.values)]
             if self.interpolate:
                 extend = 2
                 extended_x_pos = (
@@ -119,12 +122,8 @@ def _compute(self):
                 extended_vals = (serie.values[-extend:] +
                                  serie.values +
                                  serie.values[:extend])
-                serie.point = self._interpolate(
+                serie.interpolated = self._interpolate(
                     extended_vals, extended_x_pos, polar=True)
-            else:
-                serie.points = [
-                    (v, x_pos[i])
-                    for i, v in enumerate(serie.values)]
 
         self._box.margin *= 2
         self._box.xmin = self._box.ymin = - self._max
diff --git a/pygal/graph/stackedline.py b/pygal/graph/stackedline.py
index 3f6a5132..5cd52fef 100644
--- a/pygal/graph/stackedline.py
+++ b/pygal/graph/stackedline.py
@@ -49,11 +49,10 @@ def _compute(self):
         accumulation = [0] * self._len
         for serie in self.series:
             accumulation = map(sum, zip(accumulation, serie.values))
+            serie.points = [
+                (x_pos[i], v)
+                for i, v in enumerate(accumulation)]
             if self.interpolate:
-                serie.points = self._interpolate(accumulation, x_pos)
-            else:
-                serie.points = [
-                    (x_pos[i], v)
-                    for i, v in enumerate(accumulation)]
+                serie.interpolated = self._interpolate(accumulation, x_pos)
 
         return super(StackedLine, self)._compute()
diff --git a/pygal/graph/xy.py b/pygal/graph/xy.py
index 09f330b1..1c1a1e1d 100644
--- a/pygal/graph/xy.py
+++ b/pygal/graph/xy.py
@@ -46,20 +46,19 @@ def _compute(self):
         rng = (xmax - xmin)
 
         for serie in self.series:
+            serie.points = serie.values
             if self.interpolate:
                 vals = zip(*sorted(serie.points, key=lambda x: x[0]))
-                serie.points = self._interpolate(
+                serie.interpolated = self._interpolate(
                     vals[1], vals[0], xy=True, xy_xmin=xmin, xy_rng=rng)
-            else:
-                serie.points = serie.values
 
         if self.interpolate:
             xvals = [val[0]
                      for serie in self.series
-                     for val in serie.points]
+                     for val in serie.interpolated]
             yvals = [val[1]
                      for serie in self.series
-                     for val in serie.points]
+                     for val in serie.interpolated]
 
         self._box.xmin, self._box.xmax = min(xvals), max(xvals)
         self._box.ymin, self._box.ymax = min(yvals), max(yvals)
diff --git a/pygal/svg.py b/pygal/svg.py
index a5748abb..438d122a 100644
--- a/pygal/svg.py
+++ b/pygal/svg.py
@@ -172,7 +172,7 @@ def slice(
         self.graph._tooltip_data(node, val, x, y, classes="centered")
         self.graph._static_value(serie_node, val, x, y)
 
-    def pre_render(self, no_data=False):
+    def pre_render(self):
         """Last things to do before rendering"""
         self.add_styles()
         self.add_scripts()
@@ -181,12 +181,13 @@ def pre_render(self, no_data=False):
         if self.graph.explicit_size:
             self.root.set('width', str(self.graph.width))
             self.root.set('height', str(self.graph.height))
-        if no_data:
-            no_data = self.node(self.root, 'text',
-                                x=self.graph.width / 2,
-                                y=self.graph.height / 2,
-                                class_='no_data')
-            no_data.text = self.graph.no_data_text
+
+    def draw_no_data(self):
+        no_data = self.node(self.root, 'text',
+                            x=self.graph.width / 2,
+                            y=self.graph.height / 2,
+                            class_='no_data')
+        no_data.text = self.graph.no_data_text
 
     def render(self, is_unicode=False, pretty_print=False):
         """Last thing to do before rendering"""