利用MFC和OpenGL制作了一个基于菜单的图形应用程序，能够使用菜单绘制圆，直线，矩形，并且能够使用鼠标拾取并且拖动，还可以通过键盘控制选择物体的转动-Using MFC and OpenGL has produced a menu-based graphical applications, can use the menu draw circles, straight lines, rectangles, and can use the mouse to pick up and drag,

Writing a Graphical Editor---The graphical editor allows you to create and edit three kinds of graphical objects – rectangles, ovals, and line segments – in a drawing. There is a linear ordering of the objects, from front to back, so that if tw