handling negative values in doughnut charts

diff --git a/src/Chart.Doughnut.js b/src/Chart.Doughnut.js
index 35de93c7fd606ad844f0ffc9f1c436f29868b546..a892b0efc6a7d11c32a9f62c7decf651b50b0638 100644 (file)
--- 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(){