![]() This principle is akin to staging, as it is known in theatre and film. The technique can also be used for less physical actions, such as a character looking off-screen to anticipate someone's arrival, or attention focusing on an object that a character is about to pick up. A dancer jumping off the floor has to bend the knees first a golfer making a swing has to swing the club back first. The 12 principles of animation Squash and stretch Īnticipation: a baseball player making a pitch prepares for the action by winding his arm back.Īnticipation is used to prepare the audience for an action, and to make the action appear more realistic. While originally intended to apply to traditional, hand-drawn animation, the principles still have great relevance for today's more prevalent computer animation. In 1999, The Illusion of Life was voted the "best animation book of all time" in an online poll done by Animation World Network. The book has been referred to by some as the " Bible of animation", and some of its principles have been adopted by traditional studios. The main purpose of these principles was to produce an illusion that cartoon characters adhered to the basic laws of physics, but they also dealt with more abstract issues, such as emotional timing and character appeal. The principles are based on the work of Disney animators from the 1930s onwards, in their quest to produce more realistic animation. There, I've decided to rely upon setTimeout(callback, 0) for now.Book cover of Disney Animation: The Illusion of Lifeĭisney's twelve basic principles of animation were introduced by the Disney animators Ollie Johnston and Frank Thomas in their 1981 book The Illusion of Life: Disney Animation. Īll of the above I was able to write thanks to the work I've been doing on Spark, specifically on the Edit module, which does use CSS transitions. requestAnimationFrame()-based performance improvements:. setTimeout()/timer performance & power implications. nice overview of CSS transitions/animations/…: Recommended reading with partial solutions: requestAnimationFrame() solves this problem, but it's unfortunately not available in many current browsers, and not at all on any mobile browsers! So, for now, you're more or less stuck with a setTimeout(callback, 0)… Otherwise, it will just immediately show the eventual value. ![]() ![]() So you actually need to know for certain that a certain property has already been rendered before changing it again (and thus triggering a CSS transition). a CSS transition will only be applied if the CSS property you're trying to transition has already been rendered. only a transitionEnd event,, no transitionStart event There are a few issues with CSS transitions as is (off the top of my head): There was some talk about having a more evolved animation system the same way we have an ajax framework (something more evolved and usable than the current ajax.getEffect method) not sure where that went but it could be a good time to think about it. We should have custom events firing before/after to allow contrib to change/cancel/react to an animation.Ĭurrently there are still prefixes for js events at the end of a css transition, we can do some work to wrap that nicely for contrib use or just go with a (small) third partly lib that does it already. The state change should be handled by a class change instead of being hardcoded into our JS. ![]() IE before 10 doesn't support CSS animations, there won't be any functionality loss, it just won't be animated. They would be better off as CSS animations which can be better handled by mobile devices. We're currently using jQuery animations for collapsible fieldset, autocomplete fadeout, tabledrag yellow warning and a pretty basic getEffect function in the ajax framework.
0 Comments
Leave a Reply. |