From d051dfe47fe422ea9c40b73695e3ccdf9ba6c511 Mon Sep 17 00:00:00 2001
From: Ben Dixon <bendxn@gmail.com>
Date: Thu, 15 Jan 2015 13:40:08 -0600
Subject: [PATCH] handling negative values in doughnut charts

---
 src/Chart.Doughnut.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Chart.Doughnut.js b/src/Chart.Doughnut.js
index 35de93c7f..a892b0efc 100644
--- a/src/Chart.Doughnut.js
+++ b/src/Chart.Doughnut.js
@@ -109,12 +109,12 @@
 			}
 		},
 		calculateCircumference : function(value){
-			return (Math.PI*2)*(value / this.total);
+			return (Math.PI*2)*(Math.abs(value) / this.total);
 		},
 		calculateTotal : function(data){
 			this.total = 0;
 			helpers.each(data,function(segment){
-				this.total += segment.value;
+				this.total += Math.abs(segment.value);
 			},this);
 		},
 		update : function(){