一个相当不错的绘图程序,包括了基本的画线,画面,画多边形的功能以及拖动,移动,编辑,打印等,更可贵的是该程序在实现拖动时有效避免了闪屏问题,值得学习-a pretty good drawing program, including the basic line drawing, face painting and polygon functions, and drag mobile, edit, print, more valuable is the process in achieving e