该程序为Vega下的OpenGL画图程序，在Vega中显示车辆模型，在使用回调函数在汽车模型中画一个方框，演示Vega和OpenGL混合编程-The program is under the OpenGL drawing program Vega, Vega is displayed in the vehicle model in the use of callback functions in the car model, draw a box, mixed programming and O