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 the elements in 'parent' with class 'className' is
- * the expected font size.
+ * Assert that all elements have a certain style property.
*/
-Util.assertFontSizes = function(parent, className, expectedSize) {
- var expectedSizePx = expectedSize + "px";
- var labels = parent.getElementsByClassName(className);
- assertTrue(labels.length > 0);
-
- // window.getComputedStyle is apparently compatible with all browsers
- // (IE first became compatible with IE9.)
- // If this test fails on earlier browsers, then enable something like this,
- // because the font size is set by the parent div.
- // if (!window.getComputedStyle) {
- // fontSize = label.parentElement.style.fontSize;
- // }
- for (var idx = 0; idx < labels.length; idx++) {
- var label = labels[idx];
- var fontSize = window.getComputedStyle(label).fontSize;
- assertEquals(expectedSizePx, fontSize);
- }
+Util.assertStyleOfChildren = function(selector, property, expectedValue) {
+ assertTrue(selector.length > 0);
+ $.each(selector, function(idx, child) {
+ assertEquals(expectedValue, $(child).css(property));
+ });
};
}
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 scale = Dygraph.getContextPixelRatio(ctx);
+
+ var i = 4 * (x * scale + imageData.width * y * scale);
+ var d = imageData.data;
+ return [d[i], d[i+1], d[i+2], d[i+3]];
+};
+
+/**
+ * Overrides the browser's built-in XMLHttpRequest with a mock.
+ * Usage:
+ *
+ * var mockXhr = Util.overrideXMLHttpRequest(your_data);
+ * ... call code that does an XHR ...
+ * mockXhr.respond(); // restores default behavior.
+ * ... do your assertions ...
+ */
+Util.overrideXMLHttpRequest = function(data) {
+ var originalXMLHttpRequest = XMLHttpRequest;
+
+ var requests = [];
+ var FakeXMLHttpRequest = function () {
+ requests.push(this);
+ };
+ FakeXMLHttpRequest.prototype.open = function () {};
+ FakeXMLHttpRequest.prototype.send = function () {
+ this.readyState = 4;
+ this.status = 200;
+ this.responseText = data;
+ };
+ FakeXMLHttpRequest.restore = function() {
+ XMLHttpRequest = originalXMLHttpRequest;
+ };
+ FakeXMLHttpRequest.respond = function() {
+ for (var i = 0; i < requests.length; i++) {
+ requests[i].onreadystatechange();
+ }
+ FakeXMLHttpRequest.restore();
+ };
+ XMLHttpRequest = FakeXMLHttpRequest;
+ return FakeXMLHttpRequest;
+};
+
+/**
+ * Format a date as 2000/01/23
+ * @param {number} dateMillis Millis since epoch.
+ * @return {string} The date formatted as YYYY-MM-DD.
+ */
+Util.formatDate = function(dateMillis) {
+ return Dygraph.dateString_(dateMillis).slice(0, 10); // 10 == "YYYY/MM/DD".length
+};