采用GDI图像编程方式，实现天空的动态效果，甚好。

该程序为游戏编程的基本功能，GDI程序设计，可载入载出图片，形成动画的效果，基于单文档程序设计，基于MFC框架，开发2维图形动画效果-The program' s basic functionality for the game programming, GDI programming, set a picture can be loaded form of animation, based on the single programming document, based on the