# Implementation of Bresenham's circle drawing algorithm [CS1255 - Graphics and Multimedia Lab]

AIM:
To write a "C++" program for the implementation of Bresenham's circle drawing algorithm in CS1255 - Graphics and Multimedia Lab.

SOURCE CODE:

#include<iostream.h>
#include<graphics.h>
#include<conio.h>
#include<math.h>
#include<stdio.h>
class MyCircle
{
int x,y,r,d,x1,y1;
public:
MyCircle();
void ShowCircle();
};
MyCircle::MyCircle()
{
x=0;
y=0;
cout<<"\nEnter the coordinates of the circle : ";
cin>>x>>y;
cout<<"\nEnter the radius of the circle : ";
cin>>r;
}
void MyCircle::ShowCircle()
{
char *s;
x1=0;
y1=r;
d=3-2*r;
while(x1<y1)
{
putpixel((x+x1+320),(-y+y1+240),5);
putpixel((x-x1+320),(-y+y1+240),5);
putpixel((x+x1+320),(-y-y1+240),5);
putpixel((x-x1+320),(-y-y1+240),5);
putpixel((x+y1+320),(-y+x1+240),5);
putpixel((x-y1+320),(-y+x1+240),5);
putpixel((x+y1+320),(-y-x1+240),5);
putpixel((x-y1+320),(-y-x1+240),5);
if(d<0)
d+=4*x1+6;
else
{
d+=4*(x1-y1)+10;
y1--;
}
x1++;
}
setcolor(5);
outtextxy(318+x,235+y,"");
setcolor(90);
sprintf(s,"Center(%d,%d)",x,y);
outtextxy(20,10,"The center is at");
outtextxy(20,20,s);
outtextxy(20,30,s);
outtextxy(218,10,"BRESENHAM'S CIRCLE ALGORITHM");
getch();
}
void main()
{
int gd=DETECT,gm,i,j;
clrscr();
MyCircle c;
initgraph(&gd,&gm,"C:/TC/BGI");
cleardevice();
rectangle(120,40,320,240);
rectangle(320,40,520,240);
rectangle(120,240,320,440);
rectangle(320,240,520,440);
for(i=130;i<=520;i+=10)
for(j=50;j<=430;j+=10)
putpixel(i,j,75);
for(i=128;i<=510;i+=10)
{
if(i==318)
continue;
outtextxy(i,237,"+");
}
for(i=47;i<=430;i+=10)
{
if(i==237)
continue;
outtextxy(317,i,"-");
}
outtextxy(310,230,"0");
outtextxy(530,240,"x");
outtextxy(320,450,"-y");
outtextxy(100,240,"-x");
outtextxy(320,30,"y");
c.ShowCircle();
closegraph();
}

OUTPUT:

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