画图软件，这是我上机实习做的用Opengl开发的2D画图软件（我们上机实习的大作业），它具有绘制图形，选定图形，裁剪图形。。。等等它全部采用Opengl开发制作，是你三维的好代码-Drawing software, which is on my machine to do the internship with opengl 2D drawing software development [we practice on a large machine operation], it has dra