同时结合课题研究对三类动画技术：相机动画、实体对象动画和环境动画进行了实践。

Meanwhile, practice was taken about three kinds of animation technology including camera animation, entity object animation and circumstance animation.

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解决方案是使用Date对象的value Of方法确定动画开始了多长时间。

The solution is to use the valueOf method on the Date object to see how long it has been since the start of the animation.

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AnimationManager 类控制定时器并向其 Animation 对象列表中的第一项发送动画消息。

The AnimationManager class controls the timer and sends animate messages out to the first item in its list of Animation objects.

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