VC++适时动态曲线绘制并打印及预览，源码包包含一个DLL组件的源代码，本程序可适时生成统计曲线，并预览、载入外部数据、存盘、打印图形等功能-VC++ timely and dynamic curve drawing and print preview, source code package contains a DLL component of the source code, the program can generate timely statistical curve, and pr