自己编制的大型图形浏览程序源码，可以任意拖动，设置透明或不透明显示方式（BMP格式），任意角度旋转，放大或缩小，主要用于课堂教学中对大型图形的展示。-Their own large-scale preparation of graphical source browser, drag can be set up transparent or opaque display (BMP format), arbitrary angle rotation, zoom in or out, mainly for classroom teaching of large graphics display.