Program to draw Circle using Bresenham Algorithm

Code for header file “Myhd.h”

#include<conio.h>

#include <stdio.h>

#include <dos.h>

#include <graphics.h>

void circleBres(int, int, int);

void drawCircle(int, int, int, int);

void circleBres(int xc, int yc, int r)

{

int x = 0, y = r;

int d = 3 - 2 * r;

while (x < y)

{

drawCircle(xc, yc, x, y);

x++;

if (d < 0)

d = d + 4 * x + 6;

else

{

y--;

d = d + 4 * (x - y) + 10;

}

drawCircle(xc, yc, x, y);

}

}

void drawCircle(int xc, int yc, int x, int y)

{

putpixel(xc+x, yc+y, RED);

putpixel(xc-x, yc+y, RED);

putpixel(xc+x, yc-y, RED);

putpixel(xc-x, yc-y, RED);

putpixel(xc+y, yc+x, RED);

putpixel(xc-y, yc+x, RED);

putpixel(xc+y, yc-x, RED);

putpixel(xc-y, yc-x, RED);

}   

                  

Code For Main Program  

#include<conio.h>

#include <stdio.h>

#include <dos.h>

#include <graphics.h>

#include"z:myhd.h"

void main()

{

int xc, yc, r;

int gd = DETECT, gm;

initgraph(&gd, &gm, "");

printf("Enter center coordinates of circle: ");

scanf("%d %d", &xc, &yc);

printf("Enter radius of circle: ");

scanf("%d", &r);

circleBres(xc, yc, r);

getch();

}  

OUTPUT: