ary.push(y_labels[i].innerHTML);
}
return ary;
-}
+};
/**
* Get the x-labels for a given axis.
ary.push(x_labels[i].innerHTML);
}
return ary;
-}
+};
/**
* Returns all text in tags w/ a given css class, sorted.
}
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));
+ });
+};
/**
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]];
+};