From dbd72552ea06ccd51a320e7f5a7390aa2a50b23b Mon Sep 17 00:00:00 2001
From: AnSavvides <andreas@editd.com>
Date: Fri, 14 Nov 2014 14:24:19 +0000
Subject: [PATCH] If the y domain is zero, then add no padding, start at
 baseline

---
 c3.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/c3.js b/c3.js
index 373d3e5..55bd28b 100644
--- a/c3.js
+++ b/c3.js
@@ -1364,7 +1364,8 @@
             if (isAllPositive) { padding_bottom = yDomainMin; }
             if (isAllNegative) { padding_top = -yDomainMax; }
         }
-        return [yDomainMin - padding_bottom, yDomainMax + padding_top];
+        yDomainMin = yDomainMin === 0 ? yDomainMin : yDomainMin - padding_bottom;
+        return [yDomainMin, yDomainMax + padding_top];
     };
     c3_chart_internal_fn.getXDomainMin = function (targets) {
         var $$ = this, config = $$.config;