The viewport tag changes the logical view size when displaying a page.
显示页面时视窗标签修改逻辑视图大小。
We will place the front car view in the front viewport, we will use car height as reference to place the bitmap.
我们将从汽车前面观看，设为前视图，我们将使用汽车的高度作为参考，布置位图。
Normalized Viewport Rectangles are specifically for defining a certain portion of the screen that the current camera view will be drawn upon.
标准视口矩形是专门用来定义当前相机的视点将显示在屏幕的哪一部分。
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