Aim:To implement 2D Transformations

PROGRAM:

# include<iostream.h>
# include<conio.h>
# include<math.h>
# include<DOS.h>
# include<graphics.h>
void main()
{
  clrscr();
  float x1,y1,x2,y2,x3,y3;
  int gd=DETECT,gm;
  int c;
  float tt,sf,rf;
  initgraph(&gd;,&gm;,"");
  /*line(92,100,42,200);
  line(42,200,142,200);
  line(142,200,92,100);
  delay(5);*/
  cout<<"select case: 1. Translation 2. Scaling 3. Rotation";
  cin>>c;
  switch(c)
  {
    case 1: cout<<"Enter translation factor:";
     cin>>tt;
     cout<<"original figure:" ;
     line(92,100,42,200);
     line(42,200,142,200);
     line(142,200,92,100);
     cout<<"\t translated figure: ";
     x1=92+tt;
     y1=100+tt;
     x2=42+tt;
     y2=200+tt;
     x3=142+tt;
     y3=200+tt;
     cout<<"\t\t\t\t\t\t";
     

               line(x1,y1,x2,y2);
     cout<<"\t\t\t\t\t\t";
     line(x2,y2,x3,y3);
     cout<<"\t\t\t\t\t\t";
     line(x3,y3,x1,y1);
     break;

   case 2:  cout<<"Enter scaling factor:\n ";
     cin>>sf;
     cout<<"original figure:\n" ;

     line(92,100,42,200);

     line(42,200,142,200);

     line(142,200,92,100);
     cout<<"\t scaled figure:\t\t ";
     x1=92*sf;
     y1=100*sf;
     x2=42*sf;
     y2=200*sf;
     x3=142*sf;
     y3=200*sf;

     line(x1,y1,x2,y2);
      cout<<"\t\t\t\t";
     line(x2,y2,x3,y3);
      cout<<"\t\t\t\t";
     line(x3,y3,x1,y1);
     break;

   case 3:  cout<<"Enter theta value:\n ";
     cin>>rf;
     cout<<"original figure:\n" ;

     line(92,100,42,200);

     line(42,200,142,200);
               line(142,200,92,100);
     cout<<" \t\t\t\t rotated figure:\t\t ";
     x1=(92*cos(rf)-100*sin(rf));
     y1=(92*sin(rf)+100*cos(rf));
     x2=(42*cos(rf)-200*sin(rf));
     y2=(42*sin(rf)+200*cos(rf));
     x3=(142*cos(rf)-200*sin(rf));
     y3=(142*sin(rf)+200*cos(rf));
     cout<<"\t \t \t \t\t \t \t \t";

     line(x1,y1,x2,y2);
     line(x2,y2,x3,y3);
     line(x3,y3,x1,y1);
     break;

 case 4: cout<<"Invalid!!!" ;
  break;
  }
  getch();
  closegraph();
  }