*
* @author konigsberg@google.com (Robert Konigsberg)
*/
+
+import * as utils from '../../src/dygraph-utils';
+
var Util = {};
/**
/**
* Sample a pixel from the canvas.
* Returns an [r, g, b, a] tuple where each values is in [0, 255].
+ * This is _very_ slow! If you want to sample many pixels, use PixelSampler.
*/
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 scale = utils.getContextPixelRatio(ctx);
var i = 4 * (x * scale + imageData.width * y * scale);
var d = imageData.data;
* @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
+ return utils.dateString_(dateMillis).slice(0, 10); // 10 == "YYYY/MM/DD".length
+};
+
+/**
+ * Capture console.{log,warn,error} statements into obj.
+ * obj will look like {log:[], warn:[], error:[]}
+ * This returns a function which will restore the original console.
+ */
+Util.captureConsole = function(obj) {
+ obj.log = [];
+ obj.warn = [];
+ obj.error = [];
+ var orig = [console.log, console.warn, console.error];
+ console.log = function(text) { obj.log.push(text); };
+ console.warn = function(text) { obj.warn.push(text); };
+ console.error = function(text) { obj.error.push(text); };
+
+ return function() {
+ console.log = orig[0];
+ console.warn = orig[1];
+ console.error = orig[2];
+ };
};
+
+export default Util;