Computer Graphics Lab

#include<graphics.h>
#include<conio.h>
#include<stdio.h>

void plotpoints(int x,int y,int cx,int cy)
{
putpixel(cx+x,cy+y,4);
putpixel(cx-x,cy+y,4);
putpixel(cx+x,cy-y,4);
putpixel(cx-x,cy-y,4);
putpixel(cx+y,cy+x,4);
putpixel(cx-y,cy+x,4);
putpixel(cx+y,cy-x,4);
putpixel(cx-y,cy-x,4);
}

void main()
{
int cx,cy,x=0,y,r,p;
int gd=DETECT,gm=DETECT;

clrscr();

printf("Enter the center n");
scanf("%d%d",&cx,&cy);
printf("Enter the radius : ");
scanf("%d",&r);

y=r;
p=1-r;

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

while(x<y)
{
plotpoints(x,y,cx,cy);
x++;
if(p<0)
p+=2*x+1;
else
{
y--;
p+=2*(x-y)+1;
}
}

getch();

}