实现了Bresenham画线算法，实现了橡皮筋功能，并且实现了种子填充算法，同时对种子填充算法进行了改进，解决了种子填充算法过于耗资源从而导致内存溢出的缺点。-Bresenham line drawing algorithm implemented to achieve a rubber band function, and to achieve a seed filling algorithm, while the seed filling algorithm has been improve