对图形绘制程序的修改完善,里面除了包含圆,矩形,直线等矢量图形的绘制保存,里面还包含图形的操作,如拖动,旋转.还增加了图形的放大缩小,填充,撤销和重做机制等功能.

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

实现了绘制直线，圆，矩形以及它们的平移，旋转，撤销，重复等操作，注释清楚-Draw straight lines, circles, rectangles, and their translation, rotation, revoked, repeat operation, comments clear

在客户端客户区绘制的图元可以同步绘制到服务器上的客户区上，支持撤销和恢复，支持插入文本，多线程、文件传输、断点续传双缓冲画图等。-On the client side of the client area map of yuan can synchronize on the client area of the drawing to the server, support undo and restore, support inserting text, multithreading, file