在计算机图形学中，只限于指向上或向下滚动屏幕图形的过程。
In computer graphics, scrolling restricted to an upward or downward direction.
在地理信息系统的开发过程中，对屏幕图形进行精确识别是一个较难解决的技术问题。
In the development of geographical information system, the precise recognition of the screen graph is the technical problem which difficult to solve.
构建窗口并用数据和图形来描绘屏幕。
Builds the Windows and paints the screen with data and graphics.
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