中点Brehensam画圆算法

 #include<stdio.h>

 #include<stdlib.h>

 #include<graphics.h>

 #include<math.h>

 void MidBrehansemCircle(int x, int y, int radius);

 int main()

 {

     int gdriver = DETECT, gmove;

     int x, y, radius;

     printf("Please input circle corner:\n");

     scanf("%d%d", &x, &y);

     printf("Please input circle radius:\n");

     scanf("%d", &radius);

     initgraph(&gdriver, &gmove, "");

     MidBrehansemCircle(x, y, radius);

     system("pause");

     closegraph();

     return ;

 }

 void MidBrehansemCircle(int x, int y, int radius)

 {

     int d0 = -radius, di,x0=,y0=radius;

     di = d0;

     while (x0<=y0)

     {

         putpixel(x0+x, y0+y, RED);      //45-90

         putpixel(y0+y, x0+x, YELLOW);   //0-45

         putpixel(x-x0, y0 + y, BLUE);   //90-135

         putpixel( y- y0, x+x0, WHITE);  //135-180

         putpixel( x- x0,  y- y0, RED);  //225-270

         putpixel( y- y0,  x- x0, YELLOW);//180-225

         putpixel(x0+x,  y- y0, BLUE);   //270-315

         putpixel(y0+y,  x- x0, WHITE);  //315-360

         if (di >= )

         {

             di +=  * (x0 - y0) + ;

             y0--;

         }

         else

             di +=  * x0 + ;

         x0++;

     }

 }