Computer Graphics Scan converting a Ellipse

Scan Converting a Ellipse:

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

Scan Converting a Ellipse

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:

Scan Converting a Ellipse

There two methods of defining an Ellipse:

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

Next TopicPolynomial Method

2d transformation 3d computer graphics 3d transformation animation techniques cathode ray tube circle generation algorithm color crt monitors computer animation computer graphics tutorial crt curves display processor flat panel display fractals introduction keyframing line generation algorithm polygon filling algorithm random scan display raster scan display surfaces types of curves viewing and clipping

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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