From ee6bfc75409d9caffa634d61b10cab5656bf0c54 Mon Sep 17 00:00:00 2001
From: Andy Dufilie <andrew.dufilie@iweave.com>
Date: Wed, 17 Feb 2016 16:40:21 -0500
Subject: [PATCH] replaced drag selection XOR with more reasonable behavior.

---
 src/drag.js | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/drag.js b/src/drag.js
index 56ab070..d4e526e 100644
--- a/src/drag.js
+++ b/src/drag.js
@@ -47,11 +47,11 @@ c3_chart_internal_fn.drag = function (mouse) {
                 // line/area selection not supported yet
                 return;
             }
-            if (isWithin ^ isIncluded) {
-                shape.classed(CLASS.INCLUDED, !isIncluded);
+            if (isWithin ^ isSelected || isWithin ^ isIncluded) {
+                shape.classed(CLASS.INCLUDED, isWithin);
                 // TODO: included/unincluded callback here
-                shape.classed(CLASS.SELECTED, !isSelected);
-                toggle.call($$, !isSelected, shape, d, i);
+                shape.classed(CLASS.SELECTED, isWithin);
+                toggle.call($$, isWithin, shape, d, i);
             }
         });
 };