Bresenham算法画直线的函数的问题

Question

菜鸟一枚。。看了一下Bresenham算法的推导。。自己写了个画直线的函数，但就是和例题中画线函数（也是用Bresenham）画出来的图形不一样。求大神指点。。

int Draw_Line2(int x0, int y0,  int x1, int y1,  DWORD color,  UCHAR *vb_start, int lpitch) {  if (x0 > x1)//确保dx>0;  {   int temp = x0; x0 = x1; x1 = temp;   temp = y0; y0 = y1; y1 = temp;  }  int x = x0, y = y0;  int   dx = x1 - x0;  int   dy = y1 - y0;    vb_start = vb_start + x0 + y0*lpitch;  int Sub;  if (dy > 0)  {   if (dx > dy)   {    Sub = (dy << 1) - dx;    while (x++ <= x1)    {     *vb_start = color;     ++vb_start;     if (Sub > 0)     {      vb_start += lpitch;      Sub += (dy << 1) -( dx << 1);     }     else      Sub += (dy << 1);

Answer 1

好歹用个代码格式..这样的排版没人愿意看的....