#include<graphics.h>
#include<iostream>
#include<stdlib.h>
#include<math.h>

using namespace std;

class dline
{
    protected:
        int x0,y0,x1,y1,x2,y2, colour;
    public:
        dline()
            {
                    x1=0;
             y1=0;
             x2=0;
             y2=0;
            }
    void setcolor(int color)
        {
            colour =color;
        }

    void setoff1(int xx,int yy)
    { 
        x0=xx;
        y0=yy;
    }
    void setline(float x1,float y1, float xx,float yy)
 
    { 
        x1=x1+x0; y1=y0-y1; x2=xx+x0, y2=y0-yy;
    } 
     
    void drawl(float x1,float y1, float xx,float yy)
    {
        float x,y,dx,dy,len;
        int i;     
        dx=abs(x2-x1);
        dy=abs(y2-y1);
     
        if(dx >= dy)
        {

            len=dx;
        }
        else
        {
            len=dy;
        }
        dx=(x2-x1)/len;
        dy=(y2-y1)/len;
        x = x1 + 0.5;
        y = y1 + 0.5; 
     
          putpixel(x,y,colour);
            x = x + dx;
            y = y + dy;
          
    }
};
class mcircle:public dline
    {
    private: int x0,y0;
    public:
    mcircle():dline()
    {
        x0=0;
    y0=0;
    }
    void setoff(int xx,int yy)
    { 
        x0=xx;
        y0=yy;
    }
  
    void drawc(float x1, float y1, int r)
    {
        int i, x, y;
        float d;    
        x=0, y=r;
        d = 1.25 - r;           
        dline::setline(x,y,x,y);
        do
        {
          
          
        dline::drawl(x1+x0+x, y0-y1+y,x1+x0+x, y0-y1+y);
            dline::drawl(x1+x0+y, y0-y1+x,x1+x0+y, y0-y1+x);
            dline::drawl(x1+x0+y, y0-y1-x,x1+x0+y, y0-y1-x);
            dline::drawl(x1+x0+x, y0-y1-y,x1+x0+x, y0-y1-y);
            dline::drawl(x1+x0-x, y0-y1-y,x1+x0-x, y0-y1-y);
            dline::drawl(x1+x0-y, y0-y1-x,x1+x0-y, y0-y1-x);
            dline::drawl(x1+x0-y, y0-y1+x,x1+x0-y, y0-y1+x);
            dline::drawl(x1+x0-x, y0-y1+y,x1+x0-x, y0-y1+y);
         

            if(d<0)
            {
                x = x + 1;
                d = d + (2*x) + 3;
            }
            else
            {
                x = x + 1;
                y = y - 1;
                d = d + (2*x-2*y) + 3;
            }

        }while(x<=y);
    }  
  
};


int main()
{
  
    int gd=DETECT,gm=VGAMAX;
    int i, x, y, r, xmax,ymax,xmid,ymid;
    char a;
  
    initgraph(&gd,&gm,NULL);
    dline l;  
    mcircle c;
    xmax = getmaxx();
        ymax = getmaxy();
        xmid = xmax /2;
        ymid = ymax /2;

        line(xmid,0,xmid,ymax); 
        line(0,ymid,xmax,ymid);
  
   do
   {  
    cout<<"\n Enter x: "; cin>>x;
    cout<<"\n Enter y: "; cin>>y;
    cout<<"\n Enter radius: "; cin>>r;
  
    c.setoff(xmid, ymid);
    l.setoff1(xmid, ymid);
    l.setcolor(15);
    c.drawc(x,y,r);
  
    cout<<"\nDO U Want To Continue y OR n: ";
    cin>>a;
    }while(a!='n');
  
    delay(1000);
    getch();
    closegraph();
    return 0;
}