Computer Graphics Scan converting a Ellipse

by Online Tutorials Library July 14, 2022

Scan Converting a Ellipse:

The ellipse is also a symmetric figure like a circle but is four-way symmetry rather than eight-way.

Program to Implement Ellipse Drawing Algorithm:

  #include  #include  #include  #include  void disp();  float x,y;  intxc,yc;  void main()  {                  intgd=DETECT,gm,a,b;                  float p1,p2;                  clrscr();                  initgraph(&gd,&gm,”c:\turboc3\bgi”);                  printf(“*** Ellipse Generating Algorithm ***n”);                  printf(“Enter the value of Xct”);                  scanf(“%d”,&xc);                  printf(“Enter the value of yct”);                  scanf(“%d”,&yc);                  printf(“Enter X axis lengtht”);                  scanf(“%d”,&a);                  printf(“Enter Y axis lengtht”);                  scanf(“%d”,&b);                  x=0;y=b;                  disp();                  p1=(b*b)-(a*a*b)+(a*a)/4;                  while((2.0*b*b*x)<=(2.0*a*a*y))                  {                                  x++;                                  if(p1<=0)                                  p1=p1+(2.0*b*b*x)+(b*b);                                  else  {                                                  y–;                                                  p1=p1+(2.0*b*b*x)+(b*b)-(2.0*a*a*y);   }                                 disp();                                 x=-x;                                 disp();                                 x=-x;                                 delay(50);                   }                   x=a;                   y=0;                   disp();                   p2=(a*a)+2.0*(b*b*a)+(b*b)/4;                   while((2.0*b*b*x)>(2.0*a*a*y))                  {                                  y++;                                  if(p2>0)                                  p2=p2+(a*a)-(2.0*a*a*y);                                  else  {                                                  x–;                                                  p2=p2+(2.0*b*b*x)-(2.0*a*a*y)+(a*a);   }                                  disp();                                  y=-y;                                  disp();                                  y=-y;                                  delay(50);                 }                  getch();                  closegraph();  }   void disp()  {                putpixel(xc+x,yc+y,7);                 putpixel(xc-x,yc+y,7);                 putpixel(xc+x,yc-y,7);            putpixel(xc+x,yc-y,7);    }  

Output:

There two methods of defining an Ellipse:

Polynomial Method of defining an Ellipse
Trigonometric method of defining an Ellipse

Next TopicPolynomial Method

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Computer Graphics Scan converting a Ellipse

Scan Converting a Ellipse:

Program to Implement Ellipse Drawing Algorithm:

Why is my Internet connection so slow

BGP | Border Gateway Protocol

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