2D_Transformations.C

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include<math.h>
void main()
{
  int gdriver = DETECT, gmode;
  int x1,x2,x3,y1,y2,y3,nx1,nx2,nx3,ny1,ny2,ny3,c;
  int xt,yt,r;
  float t,sx,sy;
  initgraph(&gdriver, &gmode, "C:\\TURBOC3\\BGI");
  printf("\nEnter the points of triangle:\t");
  setcolor(15);
  scanf("%d%d",&x1,&y1);
  scanf("%d%d",&x2,&y2);
  scanf("%d%d",&x3,&y3);
  line(x1,y1,x2,y2);
  line(x2,y2,x3,y3);
  line(x3,y3,x1,y1);
  getch();
  printf("\n 1.Translation\n 2.Rotation\n 3.Scalling\n 4.exit");
  printf("\n Enter your choice:");
  scanf("%d",&c);
  switch(c)
{
    case 1:
	printf("\n Enter the translation factor: ");
	scanf("%d%d",&xt,&yt);
	nx1=x1+xt;
	ny1=y1+yt;
	nx2=x2+xt;
	ny2=y2+yt;
	nx3=x3+xt;
	ny3=y3+yt;
	line(nx1,ny1,nx2,ny2);
	line(nx2,ny2,nx3,ny3);
	line(nx3,ny3,nx1,ny1);
	getch();
	break;

     case 2:
	 printf("\n Enter the angle of rotation: ");
	 scanf("%d",&r);
	 t=3.14*r/180;
	 nx1=abs(x1*cos(t)-y1*sin(t));
	 ny1=abs(x1*sin(t)+y1*cos(t));
	 nx2=abs(x2*cos(t)-y2*sin(t));
	 ny2=abs(x2*sin(t)+y2*cos(t));
	  nx3=abs(x3*cos(t)-y3*sin(t));
	  ny3=abs(x3*sin(t)+y3*cos(t));
	  line(nx1,ny1,nx2,ny2);
	  line(nx2,ny2,nx3,ny3);
	  line(nx3,ny3,nx1,ny1);
	  getch();
	  break;

     case 3:
	  printf("\n Enter the scalling factor: ");
	  scanf("%f%f",&sx,&sy);
	  nx1=x1*sx;
	  ny1=y2*sy;
	  nx2=x2*sx;
	  ny2=y2*sy;
	  nx3=x3*sx;
	  ny3=y3*sy;
	  line(nx1,ny1,nx2,ny2);
	  line(nx2,ny2,nx3,ny3);
	  line(nx3,ny3,nx1,ny1);
	  getch();
	  break;

     case 4:
	  break;
     default:
	  printf("Enter the correct choice");
}
   closegraph();
}