一个简单的可以交互的OpenGL应用程序，支持用户利用鼠标创建和删除2维多边形,可以设置多边形颜色，进行填充，也实现了一些简单的画直线，画圆的算法-A simple interactive OpenGL applications to support the user using the mouse to create and delete the 2-dimensional polygon, you can set the polygon color, fill the polygon.Some simple algorithms which can draw lines,circles are included too.