简单绘图程序，可画铅笔线条、直线、矩形、圆角矩形、圆、椭圆、填充图形（编辑颜色）以及橡皮、输入文字、撤销、重做、背景颜色设置、反色、线条粗细设置、存储、读取图片等功能。-A simple drawing program to draw a pencil line, straight, rectangular, rounded rectangular, round, oval, filling graphics (edit color), as well as rubber, enter text