基于MFC的简单的多文档绘图程序，代码详细，实现了各种图形的拖动及改变大小和图像的保存功能，适合于新手学习和研究-MFC-based multi-document simple drawing program, the code in detail, to achieve a variety of graphical drag and save the image to change the size and function, suitable for novice learning and