通过实现这个二维图形编辑系统，掌握图形的生成算法，图形变换，图形文件存储，多边形填充等方面的知识。这个系统要求用户界面设计合理，图形绘制算法效率高，能完成简单二维图形的绘制、变换、坐标变换、图案填充等功能-through the realization of the two-dimensional graphics editing system, master graphics algorithm for the generation, transformation graphics, graphics files, polygon fill in the blanks of knowledge. The system requirements rational design of the user interface, graphics rendering algorithm with high efficiency, completion of a simple two-dimensional graphics rendering, transformation, coordinate transformation, design features such as filling