拖动鼠标画线，圆，矩形的例子-Drag painting line, circle, rectangle example

VC/C++源码,图形处理,图形绘制Graphic 用VC画直线、画椭圆、画矩形、画点，选择所要绘制的图形，拖动鼠标即可完成绘制，同时程序还演示了如何读取和写入TXT文件。-VC/c++ source code, graphics processing, graphics rendering with VC Graphic painting line, painting elliptic, painting rectangular, painting point, choose to draw