Bresenham's Circle Drawing Program (Source Code)

/*Bresenham's Circle Drawing algorithm*/

#include<dos.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
#include<iostream.h>
void main()
{
float d;
int gd,gm,x,y,midx,midy;
int r;
clrscr();

/* Read the radius of the circle
---------------------------------- */
cout<<"\tEnter the radius of a circle :";
cin>>r;

/* Initialise graphics mode
------------------------------*/
detectgraph(&gd,&gm);
initgraph(&gd,&gm,"c:\\tc\\bgi");
/* Initialise starting points
-------------------------------*/
x = 0;
y = r;
midx=getmaxx()/2;
midy=getmaxy()/2;
/* initialise the decision variable
---------------------------------------*/
d = 3 - 2 * r;
do
{ putpixel(midx+x,midy+y,BLUE);
putpixel(midx+y,midy+x,GREEN);
putpixel(midx+y,midy-x,RED);
putpixel(midx+x,midy-y,BROWN);
putpixel(midx-x,midy-y,LIGHTGRAY);
putpixel(midx-y,midy-x,LIGHTBLUE);
putpixel(midx-y,midy+x,LIGHTGREEN);
putpixel(midx-x,midy+y,LIGHTRED);
if (d <= 0)
{
d = d + 4*x + 6;
}
else
{
d = d + 4*(x-y) + 10;
y = y - 1;
}
x = x + 1;
delay(50);  /* Delay is purposely inserted to see
observe the circle drawing process */
}
while(x < y);
getch();
closegraph();
}


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