C++ CODE TO IMPLEMENT AN ELLIPSE USING COMPUTER GRAPHICS

 C++ CODE TO IMPLEMENT AN ELLIPSE USING COMPUTER GRAPHICS

CODE:

#include<stdio.h>

#include<graphics.h>

int main()

{

   int gd = DETECT, gm;

   int xc,yc,x,y;float p;

   long rx,ry;

   initgraph(&gd, &gm, "C:\\TC\\BGI");

   printf("Enter coordinates of centre : ");

   scanf("%d%d",&xc,&yc);

   printf("Enter x,y radius of ellipse: ");

   scanf("%d%d",&rx,&ry);


   //Calculating points for the Region 1

   p=ry*ry-rx*rx*ry+rx*rx/4;

   x=0;y=ry;

   while(2.0*ry*ry*x <= 2.0*rx*rx*y)

   {

if(p < 0)

{

x++;

p = p+2*ry*ry*x+ry*ry;

}

else

{

x++;y--;

p = p+2*ry*ry*x-2*rx*rx*y-ry*ry;

}

putpixel(xc+x,yc+y,15);

putpixel(xc+x,yc-y,15);

putpixel(xc-x,yc+y,15);

putpixel(xc-x,yc-y,15);

   }


  //Calculating points for the Region 2

   p=ry*ry*(x+0.5)*(x+0.5)+rx*rx*(y-1)*(y-1)-rx*rx*ry*ry;

   while(y > 0)

   {

if(p <= 0)

{

x++;y--;

p = p+2*ry*ry*x-2*rx*rx*y+rx*rx;

}

else

{

y--;

p = p-2*rx*rx*y+rx*rx;

}

putpixel(xc+x,yc+y,15);

putpixel(xc+x,yc-y,15);

putpixel(xc-x,yc+y,15);

putpixel(xc-x,yc-y,15);

   }

   getch();

   closegraph();

   return 0;

}

OUTPUT:

Enter coordinates of centre : 200 200
Enter x,y radius of ellipse: 100 50




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