From 870a309c8d693930baa69dd3b354d249d63b3307 Mon Sep 17 00:00:00 2001
From: Dan Vanderkam <danvdk@gmail.com>
Date: Sat, 16 Feb 2013 23:17:05 -0500
Subject: [PATCH] fix & regression test for issue 355: Row number Issue

---
 auto_tests/tests/callback.js | 44 ++++++++++++++++++++++++++++++++++++++++++++
 dygraph.js                   |  6 +++++-
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/auto_tests/tests/callback.js b/auto_tests/tests/callback.js
index 601aceb..e44e397 100644
--- a/auto_tests/tests/callback.js
+++ b/auto_tests/tests/callback.js
@@ -521,3 +521,47 @@ CallbackTestCase.prototype.testFailedResponse = function() {
 
   assertFalse("exception thrown during mouseout", failed);
 };
+
+
+// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=355 
+CallbackTestCase.prototype.testHighlightCallbackRow = function() {
+  var highlightRow;
+  var highlightCallback = function(e, x, pts, row) {
+    highlightRow = row;
+  };
+
+  var graph = document.getElementById("graph");
+  var g = new Dygraph(graph,
+    "X,Y,Z\n" +
+    "0,1,2\n" +  // 0
+    "1,2,3\n" +  // 100
+    "2,3,4\n" +  // 200
+    "3,4,5\n" +  // 300
+    "4,5,6\n",   // 400
+    { // fake name
+       width: 400,
+       height: 300,
+       highlightCallback : highlightCallback
+    });
+
+  // Mouse over each of the points
+  DygraphOps.dispatchMouseOver_Point(g, 0, 0);
+  DygraphOps.dispatchMouseMove_Point(g, 0, 0);
+  assertEquals(0, highlightRow);
+  DygraphOps.dispatchMouseMove_Point(g, 100, 0);
+  assertEquals(1, highlightRow);
+  DygraphOps.dispatchMouseMove_Point(g, 200, 0);
+  assertEquals(2, highlightRow);
+  DygraphOps.dispatchMouseMove_Point(g, 300, 0);
+  assertEquals(3, highlightRow);
+  DygraphOps.dispatchMouseMove_Point(g, 400, 0);
+  assertEquals(4, highlightRow);
+
+  // Now zoom and verify that the row numbers still refer to rows in the data
+  // array.
+  g.updateOptions({dateWindow: [2, 4]});
+  DygraphOps.dispatchMouseOver_Point(g, 0, 0);
+  DygraphOps.dispatchMouseMove_Point(g, 0, 0);
+  assertEquals(2, highlightRow);
+  assertEquals('2: Y: 3 Z: 4', Util.getLegend());
+};
diff --git a/dygraph.js b/dygraph.js
index dc7aabf..3dfc326 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -1839,7 +1839,11 @@ Dygraph.prototype.mouseMove_ = function(event) {
 
   var callback = this.attr_("highlightCallback");
   if (callback && selectionChanged) {
-    callback(event, this.lastx_, this.selPoints_, this.lastRow_, this.highlightSet_);
+    callback(event,
+        this.lastx_,
+        this.selPoints_,
+        this.lastRow_ + this.getLeftBoundary_(),
+        this.highlightSet_);
   }
 };
 
-- 
2.7.4