From 41b0f691c797e9fb48574d6f2a052d039ec98faf Mon Sep 17 00:00:00 2001
From: Dan Vanderkam <danvdk@gmail.com>
Date: Thu, 21 Oct 2010 22:45:13 -0400
Subject: [PATCH] fixed some bugs for stacked charts

---
 dygraph.js | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/dygraph.js b/dygraph.js
index d6f7edf..3b1c6d3 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -1888,11 +1888,6 @@ Dygraph.prototype.drawGraph_ = function() {
     }
 
     var seriesExtremes = this.extremeValues_(series);
-    extremes[seriesName] = seriesExtremes;
-    var thisMinY = seriesExtremes[0];
-    var thisMaxY = seriesExtremes[1];
-    if (minY === null || (thisMinY != null && thisMinY < minY)) minY = thisMinY;
-    if (maxY === null || (thisMaxY != null && thisMaxY > maxY)) maxY = thisMaxY;
 
     if (bars) {
       for (var j=0; j<series.length; j++) {
@@ -1906,18 +1901,24 @@ Dygraph.prototype.drawGraph_ = function() {
         // If one data set has a NaN, let all subsequent stacked
         // sets inherit the NaN -- only start at 0 for the first set.
         var x = series[j][0];
-        if (cumulative_y[x] === undefined)
+        if (cumulative_y[x] === undefined) {
           cumulative_y[x] = 0;
+        }
 
         actual_y = series[j][1];
         cumulative_y[x] += actual_y;
 
         series[j] = [x, cumulative_y[x]]
 
-        if (!maxY || cumulative_y[x] > maxY)
-          maxY = cumulative_y[x];
+        if (cumulative_y[x] > seriesExtremes[1]) {
+          seriesExtremes[1] = cumulative_y[x];
+        }
+        if (cumulative_y[x] < seriesExtremes[0]) {
+          seriesExtremes[0] = cumulative_y[x];
+        }
       }
     }
+    extremes[seriesName] = seriesExtremes;
 
     datasets[i] = series;
   }
-- 
2.7.4