基于文档形式的绘图，可在菜单栏中选择图形，并控制图形在文档中的运动，适合初学者学习基于VC的画图，无需额外的库，直接可运行！-Based on the document in the form of drawing graphics, can be selected in the menu bar, and control the movement of the graphics in the document, suitable for beginners to learn VC drawin