开窗《1》这个程序是开窗显示程序

《2》首先在窗体上绘制一个多边形，正开窗时采用图形覆盖的形式将所要显示图形周围进 行覆盖，负开窗正好相反。



《3》开窗显示采用图形覆盖的方法较之于裁剪方法操作上比较简单的，而且在程序的编制上 也是比较简单的。但是在进行图形的显示之后，图形的边界不能进行自的连接-Window " 1"　This program is a window display program " 2"　first draw in the form of a polygon, when the windows are covered by the form of graphical display graphics to be around for cover, the opposite of negative windows. " 3"　window display graphical methods covered in the cutting method than the relatively simple operation, but also in the process of preparation is also relatively simple. However, after a graphic display, graphic borders can not be self-connection