. Program To Implement Scaling,Rotation and Translation of The Triangle

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

#include<math.h>

void main()

{

            int gm;

            int gd=DETECT;

            int x1,x2,x3,y1,y2,y3,nx1,nx2,nx3,ny1,ny2,ny3,c;

            int sx,sy,xt,yt,r;

            float t;

                initgraph(&gd,&gm,"c:\\turboc3\\bgi");

            printf("\t Program for basic transactions");

            printf("\n\t Enter the points of triangle");

                setcolor(15);

                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();

                printf("\n 1.Transaction\n 2.Rotation\n 3.Scalling\n 4.Exit");

                printf("\nEnter 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("%d%d",&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();

                                                    }