图形学的代码，使用系统提供的绘点函数，加上自己的算法。可以画出直线。包括DDA算法和breshenham算法，中心点画圆和8分画圆，提供种子填充算法，多边形画法。-graphics code, the use of the system provides painted point function, together with its own algorithm. Sense straight. DDA include algorithms and breshenham algorithm, the crux Circle Circle and 8 pm, providing seed filling algorithm, polygon painting.