From 1069800f8f3a766949a64d0cee2e3f34b0f8e2c0 Mon Sep 17 00:00:00 2001
From: Uemit Seren <uemit.seren@gmail.com>
Date: Wed, 29 Feb 2012 16:58:14 +0100
Subject: [PATCH] Bugfix: Avoid getting stuck when the first datapoint has a
 NaN value

---
 auto_tests/tests/callback.js | 9 +++++----
 dygraph.js                   | 3 ++-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/auto_tests/tests/callback.js b/auto_tests/tests/callback.js
index a26b7e7..ceb9963 100644
--- a/auto_tests/tests/callback.js
+++ b/auto_tests/tests/callback.js
@@ -267,6 +267,7 @@ CallbackTestCase.prototype.testClosestPointCallbackCss2 = function() {
  */
 CallbackTestCase.prototype.testNaNData = function() {
   var dataNaN = [
+    [9, -1, NaN, NaN],
     [10, -1, 1, 2],
     [11, 0, 3, 1],
     [12, 1, 4, NaN],
@@ -293,17 +294,17 @@ CallbackTestCase.prototype.testNaNData = function() {
 
   DygraphOps.dispatchMouseMove(g, 10.1, 0.9);
   //check correct row is returned
-  assertEquals(0, h_row);
+  assertEquals(1, h_row);
 
   // Explicitly test closest point algorithms
   var dom = g.toDomCoords(10.1, 0.9);
-  assertEquals(0, g.findClosestRow(dom[0]));
+  assertEquals(1, g.findClosestRow(dom[0]));
 
   var res = g.findClosestPoint(dom[0], dom[1]);
-  assertEquals(0, res.row);
+  assertEquals(1, res.row);
   assertEquals('b', res.seriesName);
 
   res = g.findStackedPoint(dom[0], dom[1]);
-  assertEquals(0, res.row);
+  assertEquals(1, res.row);
   assertEquals('c', res.seriesName);
 };
diff --git a/dygraph.js b/dygraph.js
index bc830b2..c94536b 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -1552,7 +1552,8 @@ Dygraph.prototype.findClosestPoint = function(domX, domY) {
       dy = point.canvasy - domY;
       dist = dx * dx + dy * dy;
       if (minDist === null || dist < minDist) {
-        minDist = dist;
+    	if (!isNaN(dist))
+          minDist = dist;
         closestPoint = point;
         closestSeries = setIdx;
         idx = i;
-- 
2.7.4