Computer graphics program - Bresenham Circle Drawing Algorithm.

Bresenham’s Circle Drawing Algorithm.

Code

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>

void main()

{

int gd=DETECT,gm;

float  r,X,Y,x,y,P,tx,ty;

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

detectgraph(&gd,&gm);

cleardevice();

printf("BRESENHAM CIRCLE DRAWING ALGORITHM\n");

printf("\nEnter radius of the circle     : ");

scanf("%f",&r);

printf("\nEnter the center of the circle : ");

printf("\nx-coordinate:");

scanf("%f",&X);

printf("\ny-coordinate:");

scanf("%f",&Y);

cleardevice();

x = 0;

y = r;

P = 3 - 2*r;

putpixel(X,Y,15);

while(x<=y)

{

if(P<0)

{

P = P+4*(x+1)+2;

}

else

{

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

 y--;

}

x++;

putpixel((X+x),(Y+y),15);

putpixel((X+x),(Y-y),15);

putpixel((X-x),(Y+y),15);

putpixel((X-x),(Y-y),15);

putpixel((X+y),(Y+x),15);

putpixel((X+y),(Y-x),15);

putpixel((X-y),(Y+x),15);

putpixel((X-y),(Y-x),15);

}

getch();

}