修改视口视图和内容

To change the view within a Viewport object, you manipulate the view of a viewport you use its member properties. The following member properties allow you to adjust the display of the view in a viewport:

若要修改一个 Viewport 对象内部的视图，用户就必须使用视口的成员属性来操作视图。下面的成员属性允许用户调整视图在视口中的显示：

ViewCenter - Specifies the view center of the view in the viewport.
ViewCenter - 指定视图在视口中的视图中心。
ViewDirection - Specifies the vector from the target to the camera of the view in the viewport.
ViewDirection - 指定一个代表从目标到视图在视口中的照相机的向量。
ViewHeight - Specifies the height of the Model Space view within the viewport.
ViewHeight - 指定模型空间视图在视口内部的高度。
ViewTarget - Specifies the location of the target of the view in the viewport.
ViewTarget - 指定视图在视口中的目标的位置。