Fixed circlePath positioning

@@ -33,8 +33,8 @@
         CGFloat endAngle = clockwise ? -90.01f : 270.01f;
 
         _lineWidth = @8.0f;
-        UIBezierPath *circlePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.center.x, self.center.y)
-                                                                  radius:self.frame.size.height * 0.5
+        UIBezierPath *circlePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.frame.size.width/2, self.frame.size.height/2)
+                                                                  radius:(self.frame.size.height * 0.5) - [_lineWidth floatValue]
                                                               startAngle:DEGREES_TO_RADIANS(startAngle)
                                                                 endAngle:DEGREES_TO_RADIANS(endAngle)
                                                                clockwise:clockwise];