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The function and interface all imitate the drawing board comes in Windows, the interface, such as screenshots. Main functions are: hand-drawn lines, simple graphics, text input