Read a object file and represent that object

基于OPENGL的画图程序，可以画各种立体图，还实现的撤销、重做、颜色选择，GUI界面不错，值得研究！-OPENGL-based drawing program, you can draw a variety of three-dimensional map, and also implements the undo, redo, color selection, the GUI interface is good, and worthy of study!

OPENGL下实现的一个简单的画图程序，上方为多个按钮，可以画三角形，正方形，圆形等，还可以改变颜色，色块大小等。-Under OPENGL to achieve a simple drawing program for multiple buttons above, you can draw a triangle, square, circle, etc., you can also change the color, size and other color.