重点撑握数值微分法.此法主要内容为先算出直线的斜率 k=△y/△x 其中, △x=x1-x0, △y=y1-y0,(x0,y0)和(x1,y1)分别是直线的端点坐标。然后，从直线的起点开始，确定最佳逼近于直线的y坐标均为整数，让X从起点到终点变化，每步递增1，计算对应的y坐标，y=kx+B,并取象素（x，round(y)）。用这个方法既直观，以可行，然而效率低。-focus on shoring grip numerical differentiation. This method is mainly as first calculated linear slope# k = y/x which x = x1- x0, y1 = y-y0, (x0, y0) and (x1, y1) were straight endpoint coordinates. Then, straight from the starting point, to determine the best approach in a straight line y coordinates are integers, and let X from start-to-end change, every step an increase, calculated corresponding y, y = Response kx B, and admission pixel (x, round (y)). Using this method is straightforward, to the extent feasible, but inefficient.