将指定的不透明度设置推送到绘图上下文上，并应用指定的动画时钟。

Pushes the specified opacity setting onto the drawing context and applies the specified animation clock.

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有了动画视觉(例如，旋转时钟)，用户可以意识到将要发生什么，更愿意等待进程完成。

With animated visual (for example, a spinning clock), the user has a sense that something is happening and is much more willing to wait for the process to complete.

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现在您可以使用循环结合已学到的知识捕获每秒的时钟外观图像，然后组合这些图像来制作动画GIF图像。

Now you can use a loop with what you have learned already to capture images of the clock face every second and then combine the images to make an animated GIF image.

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