计算机图形学基本算法 画点、线、圆、多边形等，及其平移、旋转、缩放等 OpenGL 立方体、球体等，旋转缩放平移，光线控制等-Computer graphics algorithms draw point, line, circle, polygon, etc., and its translation, rotation, scaling, OpenGL cube, sphere, etc., rotating the zoom pan, light control, etc.