Fix issue 176, which involved duplicated x-values in stacked graphs

[dygraphs.git] / auto_tests / tests / Util.js

diff --git a/auto_tests/tests/Util.js b/auto_tests/tests/Util.js
index 7fca030..2d652ed 100644 (file)
--- a/auto_tests/tests/Util.js
+++ b/auto_tests/tests/Util.js
@@ -19,7 +19,7 @@ Util.getYLabels = function(axis_num, parent) {
     ary.push(y_labels[i].innerHTML);
   }
   return ary;
-}
+};
 
 /**
  * Get the x-labels for a given axis.
@@ -34,7 +34,7 @@ Util.getXLabels = function(parent) {
     ary.push(x_labels[i].innerHTML);
   }
   return ary;
-}
+};
 
 /**
  * Returns all text in tags w/ a given css class, sorted.
@@ -49,11 +49,49 @@ Util.getClassTexts = function(css_class, parent) {
   }
   texts.sort();
   return texts;
-}
+};
 
 Util.getLegend = function(parent) {
   parent = parent || document;
   var legend = parent.getElementsByClassName("dygraph-legend")[0];
-  return legend.textContent;
-}
+  var re = new RegExp(String.fromCharCode(160), 'g');
+  return legend.textContent.replace(re, ' ');
+};
 
+/**
+ * Assert that all elements have a certain style property.
+ */
+Util.assertStyleOfChildren = function(selector, property, expectedValue) {
+  assertTrue(selector.length > 0);
+  $.each(selector, function(idx, child) {
+    assertEquals(expectedValue,  $(child).css(property));
+  });
+};
+
+
+/**
+ * Takes in an array of strings and returns an array of floats.
+ */
+Util.makeNumbers = function(ary) {
+  var ret = [];
+  for (var i = 0; i < ary.length; i++) {
+    ret.push(parseFloat(ary[i]));
+  }
+  return ret;
+};
+
+
+/**
+ * Sample a pixel from the canvas.
+ * Returns an [r, g, b, a] tuple where each values is in [0, 255].
+ */
+Util.samplePixel = function(canvas, x, y) {
+  var ctx = canvas.getContext("2d");  // bypasses Proxy if applied.
+
+  // TODO(danvk): Any performance issues with this?
+  var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
+
+  var i = 4 * (x + imageData.width * y);
+  var d = imageData.data;
+  return [d[i], d[i+1], d[i+2], d[i+3]];
+};