From b7a394807ca703c65720d1be5725e9a42ef2948e Mon Sep 17 00:00:00 2001
From: Florian Mounier <florian.mounier@kozea.fr>
Date: Mon, 1 Oct 2012 10:47:28 +0200
Subject: [PATCH] Fix values inter dependency

---
 pygal/graph/base.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pygal/graph/base.py b/pygal/graph/base.py
index 0edc192..bf3b871 100644
--- a/pygal/graph/base.py
+++ b/pygal/graph/base.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+ # -*- coding: utf-8 -*-
 # This file is part of pygal
 #
 # A python svg graph plotting library
@@ -48,7 +48,9 @@ class BaseGraph(object):
         self._box = Box()
         self.view = None
         if self.logarithmic and self.zero == 0:
-            self.zero = self._min
+            # Explicit min to avoid interpolation dependency
+            self.zero = min(
+                val for serie in self.series for val in serie.values)
 
         if self.series and self._has_data():
             self._draw()