简单的Bresenham_Circle（画圆）Bresenham_Line（直线） MidpointEllipse（椭圆） 三个基本图形的实现算法-simple Bresenham_Circle (Circle) Bresenham_Lin e (linear) MidpointEllipse (oval) three basic graphics algorithm

Bresenham直线算法的一些资料，包括推理过程-Bresenham line algorithm for some of the information, including the reasoning process