4 Bresenham's Circle Drawing Algorithm Using C Programming

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

void main() {

int gd = DETECT, gm;

int x, y, r;

void cir(int, int, int);

printf("Enter the Mid points and Radious:");

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

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

cir(x, y, r);

getch();

closegraph();

}

void cir(int x1, int y1, int r) {

int x = 0, y = r, p = 1 - r;

void cliplot(int, int, int, int);

cliplot(x1, y1, x, y);

while (x < y) {

x++;

if (p < 0)

p += 2 * x + 1;

else {

y--;

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

}

cliplot(x1, y1, x, y);

}

}

void cliplot(int xctr, int yctr, int x, int y) {

putpixel(xctr + x, yctr + y, 1);

putpixel(xctr - x, yctr + y, 1);

putpixel(xctr + x, yctr - y, 1);

putpixel(xctr - x, yctr - y, 1);

putpixel(xctr + y, yctr + x, 1);

putpixel(xctr - y, yctr + x, 1);

putpixel(xctr + y, yctr - x, 1);

putpixel(xctr - y, yctr - x, 1);

getch();

}