From cf89eeed067fa2892ea502eab07a29546b9848a8 Mon Sep 17 00:00:00 2001
From: Dan Vanderkam <danvk@google.com>
Date: Thu, 16 Aug 2012 18:01:12 -0400
Subject: [PATCH] Fix Issue 229:valueRange and errorBars not mixing when
 valueRange max = data max

---
 auto_tests/tests/custom_bars.js | 31 +++++++++++++++++++++++++++++++
 dygraph-canvas.js               | 10 +++++++++-
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/auto_tests/tests/custom_bars.js b/auto_tests/tests/custom_bars.js
index 1e1b0c9..22ffd20 100644
--- a/auto_tests/tests/custom_bars.js
+++ b/auto_tests/tests/custom_bars.js
@@ -75,3 +75,34 @@ CustomBarsTestCase.prototype.testCustomBarsZero = function() {
   assertTrue('y-axis must include 0', range[0] <= 0);
   assertTrue('y-axis must include 5', range[1] >= 5);
 };
+
+// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=229
+CustomBarsTestCase.prototype.testCustomBarsAtTop = function() {
+  var g = new Dygraph(document.getElementById("graph"),
+      [
+        [1, [10, 10, 100]],
+        [1, [10, 10, 100]],
+        [2, [15, 20, 110]],
+        [3, [10, 30, 100]],
+        [4, [15, 40, 110]],
+        [5, [10,120, 100]],
+        [6, [15, 50, 110]],
+        [7, [10, 70, 100]],
+        [8, [15, 90, 110]],
+        [9, [10, 50, 100]]
+      ], {
+        width: 500, height: 350,
+        customBars: true,
+        errorBars: true,
+        drawXGrid: false,
+        drawYGrid: false,
+        drawXAxis: false,
+        drawYAxis: false,
+        valueRange: [0, 120],
+        fillAlpha: 0.15,
+        colors: [ '#00FF00' ]
+      });
+
+  var sampler = new PixelSampler(g);
+  assertEquals([0, 255, 0, 38], sampler.colorAtCoordinate(5, 60));
+};
diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index d9ef742..29e402e 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -615,9 +615,17 @@ DygraphCanvasRenderer._errorPlotter = function(e) {
       'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')';
   ctx.fillStyle = err_color;
   ctx.beginPath();
+
+  var isNullUndefinedOrNaN = function(x) {
+    return (x === null ||
+            x === undefined ||
+            isNaN(x));
+  };
+
   while (iter.hasNext) {
     var point = iter.next();
-    if ((!stepPlot && !Dygraph.isOK(point.y)) || (stepPlot && !isNaN(prevY) && !Dygraph.isOK(prevY))) {
+    if ((!stepPlot && isNullUndefinedOrNaN(point.y)) ||
+        (stepPlot && !isNaN(prevY) && isNullUndefinedOrNaN(prevY))) {
       prevX = NaN;
       continue;
     }
-- 
2.7.4