html5-animation

问题 What is the most accurate way to measure framerates, i.e. FPS, in modern HTML5 browsers? I'm specifically interested in FPS for Canvas animations. http://weblogs.mozillazine.org/roc/archives/2010/11/measuring_fps.html will tell you that trying to measure framerate by counting how often your setTimeout runs is not accurate. The browser can run your Timeout callback multiple times between screen paints. Turns out Mozilla has a window.mozPaintCount https://developer.mozilla.org/en/DOM/window

问题 Hi is it possible to have an effect of flipping a page like a book for HTML5? If so how is it done? Thanks in advance! 回答1: Here is another page-flip animation done with CSS Animations UPDATE: REPLACED LINK WITH ARCHIVE.ORG URL. The methodology is based on Roman Cortes's inspired original. The way this is constructed is that each right page is double-nested inside two divs. The inner div is rotated by 30 degrees around a rotation point above the page inside an outer div so that the page comes

问题 Rotate the dial on top of a semi circular(Northern Hemisphere) image as background. range could be 0 - 180 degrees. on input to the method that does canvas transformation, the dial would rotate and stop over the matched value. Here\'s what I was trying based on help and sample passed on by phrogz 回答1: In general, what you want to do is: Transform the context to the point on the canvas that the object should rotate about. Rotate the context. Transform the context by the negative offset within