自己编写的基于Graphics库写的绘图程序，简易绘图板，实现点、线、矩形、等图形绘制，实现设置笔刷大小，撤销功能等等，里面自己写了一些小控件例如对话框、button -Graphics library to write a drawing program, I have written simple drawing board, points, lines, rectangles, such as graphics rendering, set the brush size, undo fun