功能和界面全部模仿于Windows自带的画图板，界面如截图。功能主要有： 手绘线、简单图形、文字输入、图块拖放、重复撤销、画面缩放、打开保存图片文件-Features and interfaces in Windows, bringing all to imitate the drawing board, interface, such as screenshots. The main features include: hand-drawn lines, simple graphics, te