本程序实现用Java来进行画图，画图时可以进行图形的拖动，也可以画任意图形，也可以对图形进行旋转-The procedure to be implemented by the Java drawing, drawing and graphic can be dragged, it can draw any graphics, can also rotate graphics

对原有 Java JTree 空间的封装，可以支持方便的拖动等操作-An improvement for JTree component.

这是JAVA写的画图板，建立输入输出流、按钮数组，存放以下名称的功能按钮、创建基本操作按钮，定义铅笔画，也就是用鼠标拖动着随意绘图、绘制以指定颜色填充的实心矩形、实心椭圆、指定颜色填充的实心圆角矩形、橡皮擦-This is written in JAVA drawing board, the input and output streams, button array storage following the name of the function button to create a ba