利用opengl程序，生成右键快捷菜单的基本框架，其中包括画点，直线，三角形，多边形。但是具体功能需要自己添加。框架相当不错·-Use opengl program to generate the basic framework of the context menu, which includes paintings point, line, triangle, polygon. But the need to add specific functions. Framework is quite good