功能和界面全部模仿于Windows自带的画图板，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，其他还实现了和画图板同样效果的工具箱及颜料盒-Features and interfaces in Windows, bringing all to imitate the drawing board, mainly include: hand-painted lines, simple graphics, text input, drag and drop bl