一个简单的二维图形编辑器.实现了缩放,平移,旋转,镜像等功能.并提供,直线,圆,矩形等基本图元的算法.适合于计算机图形学的学习和应用.-a simple two-dimensional graphics editor. To achieve the scalability, translation, rotation, mirroring capabilities. And to provide a straight, a round, rectangular map yuan basic al