这是我写的一个矢量图形变换的简单程序。程序输入几何图形的边数，然后依次各顶点的坐标。然后进入菜单。Open打开输入图形，Move用来移动，GBP绕中间点旋转90度-This is the one I wrote Vector Graphics transform the simple procedure. The importation procedures edge geometry, to be followed by the coordinates of the vertices. Then enter the menu. Open Open imported graphics, Move to Mobile, GBP revolving around the mid-point of 90 degrees