基础的图形绘制，实现了空间中球体和正方体绘制，并有光照模型的测试（镜面反射和漫反射），通过上下左右PgupPgDownF1到F4可改变视角等效果-Based graphics rendering, to achieve the space sphere and cube drawing, and a test illumination model (specular and diffuse), up and down about PgupPgDownF1 to F4 can change the viewing angle effect