一.实现画图功能，能设定线型，线宽等； 二.利用元文件实现画面重绘以及图形数据的保存读取等，初学者应该练习哦 -1. To achieve drawing functions can be set to linear, line width, etc. 2. The use of metafiles to redraw the screen, and graphical data to achieve the preservation of reading and so on, begin