2 Dimensional Transformation

2 Dimensional Transformation

#include<stdio.h>
#include<graphics.h>
#include<stdlib.h>
#include<conio.h>   
#include<math.h>
void main()
{
    int gd=DETECT,gm;
    int x1,x2,x3,y1,y2,y3,nx1,nx2,nx3,ny1,ny2,ny3,c,sx,sy,xt,yt,r,p,q;
    float t,Angle;
    char ch,y;
    clrscr();
    initgraph(&gd,&gm,"C:\\Turboc3\\BGI");
    printf("\t PROGRAM FOR BASIC TRANSFORMATION");
    printf("\n Enter the points of triangle\n");
    scanf("%d %d %d %d %d %d",&x1,&y1,&x2,&y2,&x3,&y3);
    line(x1,y1,x2,y2);
    line(x2,y2,x3,y3);
    line(x3,y3,x1,y1);
    getch();
    ch='y';
    while(ch=='y')
    {
        printf("\n select the transformation\n");
        printf("1. Translation \n 2. Rotation \n 3.Scaling \n 4. Exit\n");
        printf("Enter your choice");
        scanf("%d",&c);
        switch(c)
        {
            case 1:
                cleardevice();
                printf("\n Enter the translation factor\n ");
                scanf("%d %d",&xt,&yt);
                 nx1=x1+xt;
                 ny1=y1+yt;
                 nx2=x2+xt;
                 ny2=y2+yt;
                 nx3=x3+xt;
                 ny3=y3+yt;
                cleardevice();
                line(x1,y1,x2,y2);
                line(x2,y2,x3,y3);
                line(x3,y3,x1,y1);
                line(nx1,ny1,nx2,ny2);
                line(nx2,ny2,nx3,ny3);
                line(nx3,ny3,nx1,ny1);
                getch();
                break;
            case 2:
                cleardevice();
                printf("\n Enter the angle of rotation\n");
                scanf("%d",&r);
                Angle=3.14*r/180;
                //t=Angle;
                p=x2;q=y2;
                nx1 = p + (x1 - p) * cos(Angle)-(y1 - q) * sin(Angle);
                ny1 = q + (x1 - p) * sin(Angle)+(y1 - q) * cos(Angle);
                nx2 = p + (x2 - p) * cos(Angle)-(y2 - q) * sin(Angle);
                ny2 = q + (x2 - p) * sin(Angle)+(y2 - q) * cos(Angle);
                nx3 = p + (x3 - p) * cos(Angle)-(y3 - q) * sin(Angle);
                ny3 = q + (x3 - p) * sin(Angle)+(y3 - q) * cos(Angle);
                cleardevice();
                line(x1,y1,x2,y2);
                line(x2,y2,x3,y3);
                line(x3,y3,x1,y1);
                line(nx1,ny1,nx2,ny2);
                line(nx2,ny2,nx3,ny3);
                line(nx3,ny3,nx1,ny1);
                getch();
                break;
            case 3:
                cleardevice();
                    printf("Enter the scaling factor\n");
                scanf("%d %d",&sx,&sy);
                nx1=x1*sx;
                ny1=y1*sy;
                nx2=x2*sx;
                ny2=y2*sy;
                nx3=x3*sx;
                ny3=y3*sy;
                cleardevice();
                line(x1,y1,x2,y2);
                line(x2,y2,x3,y3);
                line(x3,y3,x1,y1);
                line(nx1,ny1,nx2,ny2);
                line(nx2,ny2,nx3,ny3);
                line(nx3,ny3,nx1,ny1);
                getch();
                break;
            case 4exit(0);
                default:
                cleardevice();
                printf("\n Enter the correct choice");
        }
        printf("\n Do you want to continue Y/N");
        scanf("%s",&ch);
    }
    getch();
    closegraph();
}

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