说明：  VC++窗口视图缩放的源代码，一个用VC6开发的图形数据支持系统，其中的难点正在于理解坐标系统的含义、各种映射模式的意义以及与逻辑坐标的转换，这个小程序将逐一进行演示和注释。
(VC++ window view of scaling the source code, one with VC6 development of graphical data support system, in which the difficulty is to understand the coordinate system of meaning, a variety of mapping patterns of sense and with the logical coordinate conversion, this little program will individually demonstrate and Note.)