Implementation of Bresenhams algorithm - Circle

 1.b.) Implementation of Bresenhams algorithm - Circle  

Program : 

#include "stdio.h"

#include "conio.h"

#include "math.h"

#include "graphics.h"

          main()

          {

                    int gd=DETECT,gm;

                    int xcenter,ycenter,radius;

                    int p,x,y;

                    initgraph(&gd,&gm,"h:\\tc\\bgi");

                    x=0;

                    printf("\n Enter The Radius Value: ");

                    scanf("%d",&radius);

                    y=radius;

                    printf("\n Enter The xcenter and ycenter Values: ");

                    scanf("%d%d",&xcenter,&ycenter);

                    plotpoints(xcenter,ycenter,x,y);

                    p=1-radius;

                    while(x<y)

                    {

                             if(p<0)

                                       x=x+1;

                             else

                              {

                                       x=x+1;

                                       y=y-1;

                             }

                             if(p<0)

                                       p=p+2*x+1;

                             else

                                       p=p+2*(x-y)+1;

                     plotpoints(xcenter,ycenter,x,y);

                   }

            getch();

            return(0);

          }

          int plotpoints(int xcenter,int ycenter,int x,int y) 

           {

                    putpixel(xcenter+x,ycenter+y,1);

                    putpixel(xcenter-x,ycenter+y,1);

                    putpixel(xcenter+x,ycenter-y,1);

                    putpixel(xcenter-x,ycenter-y,1);

                    putpixel(xcenter+y,ycenter+x,1);

                    putpixel(xcenter-y,ycenter+x,1);

                    putpixel(xcenter+y,ycenter-x,1);

                    putpixel(xcenter-y,ycenter-x,1);

                    return;

          }

Output :

Enter The Radius Value                       :     80

                   

Enter The xcenter and ycenter Values :      230    260