From: Dan Vanderkam <danvdk@gmail.com>
Date: Fri, 5 Feb 2010 05:36:21 +0000 (-0800)
Subject: highlight callback only when selected point changes
X-Git-Tag: v1.0.0~739
X-Git-Url: https://adrianiainlam.tk/git/?a=commitdiff_plain;h=dd082ddacec9e50c76d626495a2eeb8bf3f8ff28;p=dygraphs.git

highlight callback only when selected point changes
---

diff --git a/dygraph.js b/dygraph.js
index 8a303a0..d9c0e27 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -782,7 +782,11 @@ Dygraph.prototype.mouseMove_ = function(event) {
   }
 
   if (this.attr_("highlightCallback")) {
-    this.attr_("highlightCallback")(event, lastx, this.selPoints_);
+    var px = this.lastHighlightCallbackX;
+    if (px !== null && lastx != px) {
+      this.attr_("highlightCallback")(event, lastx, this.selPoints_);
+      this.lastHighlightCallbackX = lastx;
+    }
   }
 
   // Clear the previously drawn vertical, if there is one