X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph.js;h=a02d919079f98662d3ec744aa127ef8a58b8c286;hb=abc8c570a4aac8be7ff4fb266e6e410b768277be;hp=c00a7b19ff2f16b40d914d8197774c5825cbc806;hpb=def24194d413e7f7b248a75f02d96724a089c283;p=dygraphs.git

diff --git a/dygraph.js b/dygraph.js
index c00a7b1..a02d919 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -1621,9 +1621,13 @@ Dygraph.prototype.getArea = function() {
  * Returns a two-element array: [X, Y].
  */
 Dygraph.prototype.eventToDomCoords = function(event) {
-  var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.mouseEventElement_);
-  var canvasy = Dygraph.pageY(event) - Dygraph.findPosY(this.mouseEventElement_);
-  return [canvasx, canvasy];
+  if (event.offsetX && event.offsetY) {
+    return [ event.offsetX, event.offsetY ];
+  } else {
+    var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.mouseEventElement_);
+    var canvasy = Dygraph.pageY(event) - Dygraph.findPosY(this.mouseEventElement_);
+    return [canvasx, canvasy];
+  }
 };
 
 /**
@@ -3506,9 +3510,12 @@ Dygraph.prototype.annotations = function() {
 /**
  * Get the list of label names for this graph. The first column is the
  * x-axis, so the data series names start at index 1.
+ *
+ * Returns null when labels have not yet been defined.
  */
 Dygraph.prototype.getLabels = function() {
-  return this.attr_("labels").slice();
+  var labels = this.attr_("labels");
+  return labels ? labels.slice() : null;
 };
 
 /**