Practical-3 || Computer Graphics

Practical-3 || CG || Circle Drawing Algorithm.cpp

#include<stdio.h>
#include<iostream.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
#include<dos.h>
#include<graphics.h>
#include<ctype.h>

void circleplot(int r,int cx,int cy){
  int x=0;
  int y=r;
  int p=1-r;
  putpixel(cx,cy,WHITE);
  putpixel(x,y,WHITE);
  while(x<y){
    x=x+1;
    if(p<0){
      p=p+2*x+1;
    }
    else{
      y=y-1;
      p=p+2*x+10-2*y;
    }
    putpixel(x+cx,y+cy,WHITE);
    putpixel(-x+cx,y+cy,RED);
    putpixel(-x+cx,-y+cy,BLUE);
    putpixel(x+cx,-y+cy,GREEN);
    putpixel(y+cx,x+cy,CYAN);
    putpixel(-y+cx,x+cy,WHITE);
    putpixel(-y+cx,-x+cy,MAGENTA);
    putpixel(y+cx,-x+cy,YELLOW);
  }
}
//todo main function
void main(){
  clrscr();
  int gd=DETECT,gm;
  int r,cx,cy;
  initgraph(&gd,&gm,"C:\\TURBOC3\\BGI");
  cleardevice();
  cout<<"\n--------------Midpoint Circle Drawing Algorithm--------------";
  cout<<"\nEnter the radius of the circle\n";
  cin>>r;
  cout<<"\nEnter the coordinates of the centre of the circle\n";
  cin>>cx>>cy;
  circleplot(r,cx,cy);
  getch();
  closegraph();
}