直线查补算法的一种改进实现，　　由于在插补过程中，有三个步进方向：水平方向、垂直方向和45度方向，比传统的插补多了个45度的步进方向，因而减少了步数，极大的提高了效率。-Linear search algorithm is an improved realization of complement, as in the interpolation process, there are three step directions: horizontal, vertical and 45 degree direction, more than the traditional interpolation step of a 45-degree direction, thus reducing the of the steps, greatly improving efficiency.