X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-layout.js;h=9a0ac3d29c74a085c11b039825f1cde8343ec56e;hb=0815ea828a3ec9bb9474eea7aaab954baac778c2;hp=7e08e3e1120cb732e7ea91111edfb494ce8f7fb5;hpb=42a9ebb8f492d2541a3904894447a7c74ba4cfd5;p=dygraphs.git

diff --git a/dygraph-layout.js b/dygraph-layout.js
index 7e08e3e..9a0ac3d 100644
--- a/dygraph-layout.js
+++ b/dygraph-layout.js
@@ -409,12 +409,15 @@ DygraphLayout.prototype.unstackPointAtIndex = function(setIdx, row) {
 
   // The unstacked yval is equal to the current yval minus the yval of the
   // next point at the same xval.
-  var points = this.points[setIdx];
-  for (var i = row + 1; i < points.length; i++) {
-    if ((points[i].xval == point.xval) && points[i].yval) {
-      unstackedPoint.yval -= points[i].yval;
-      break;
-    }
+  if (setIdx == this.points.length - 1) {
+    // We're the last series, so no unstacking is necessary.
+    return unstackedPoint;
+  }
+
+  var points = this.points[setIdx + 1];
+  if (points[row].xval == point.xval &&  // should always be true?
+      points[row].yval) {
+    unstackedPoint.yval -= points[row].yval;
   }
 
   return unstackedPoint;