Implementation of 2D Transformation for Rectangle [CS1255 - Graphics and Multimedia Lab]

AIM:
To write a "C++" program for the implementation of 2D Transformation for Rectangle in CS1255 - Graphics and Multimedia Lab.

SOURCE CODE:

#include<stdio.h>
#include<graphics.h>
#include<stdlib.h>
#include<math.h>
#include<conio.h>
int x1,y1,x2,y2,midx,midy;
void axis();
void translation()
{
int tx,ty,xn1,yn1,xn2,yn2;
printf("\n Enter the translation:\n");
scanf("%d%d",&tx,&ty);
cleardevice();
outtextxy(400,100,"TRANSLATION");
xn1=x1+tx;
yn1=y1+ty;
xn2=x2+tx;
yn2=y2+ty;
axis();
rectangle(xn1,yn1,xn2,yn2);
getch();
}

void scaling()
{
float xn1,yn1,xn2,yn2;
float sx,sy;
printf("Enter the scaling factor");
scanf("%f%f",&sx,&sy);
cleardevice();
outtextxy(300,200,"SCALING");
xn1=x1*sx;
yn1=y1*sy;
xn2=x2*sx;
yn2=y2*sy;
axis();
rectangle(xn1,yn1,xn2,yn2);
getch();
}

void rotation()
{
int ang;
float rx,xn1,yn1,xn2,yn2,x1n1,y1n1,x2n2,y2n2;
printf("\n Enter the angle for rotation:\n");
scanf("%d",&ang);
cleardevice();
outtextxy(500,200,"ROTATION");
rx=(ang*3.14)/180;
xn1=x1*cos(rx)-y1*sin(rx);
yn1=y1*cos(rx)+x1*sin(rx);
xn2=x2*cos(rx)-y2*sin(rx);
yn2=y2*cos(rx)+x2*sin(rx);
x1n1=x2*cos(rx)-y1*sin(rx);
y1n1=y1*cos(rx)+x2*sin(rx);
x2n2=x1*cos(rx)-y2*sin(rx);
y2n2=y2*cos(rx)+x1*sin(rx);
axis();
line(xn1,yn1,x1n1,y1n1);
line(x1n1,y1n1,xn2,yn2);
line(xn2,yn2,x2n2,y2n2);
line(x2n2,y2n2,xn1,yn1);
getch();
}

void shearing()
{
float sh;
float xn1,yn1,xn2,yn2,x1n1,y1n1,x2n2,y2n2;
printf("\n Enter the value for shearing:\n");
scanf("%f",&sh);
cleardevice();
outtextxy(500,100,"SHEARING");
xn1=x1+sh*y1;
yn1=y1;
xn2=x2+sh*y2;
yn2=y2;
x1n1=x2+sh*y1;
y1n1=y1;
x2n2=x1+sh*y2;
y2n2=y2;
axis();
line(xn1,yn1,x1n1,y1n1);
line(x1n1,y1n1,xn2,yn2);
line(xn2,yn2,x2n2,y2n2);
line(x2n2,y2n2,xn1,yn1);
getch();
}

void reflection()
{
int xn1,yn1,xn2,yn2;
cleardevice();
outtextxy(300,100,"REFLECTION");
if((x1<y1)^(x1<y1))
{
xn1=x1+100;
xn2=x2+100;
yn1=y1;
yn2=y2;
}
else
{
xn1=x1;
xn2=x2;
yn1=y1+100;
yn2=y2+100;
}
axis();
rectangle(xn1,yn1,xn2,yn2);
getch();
}

void get()
{
printf("\n Enter the coordinates x1,y1,x2,y2");
scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
outtextxy(200,100,"ORIGINAL OBJECT");
x1= getmaxx() / 2-x1;
y1= getmaxy() / 2-y1;
x2 = getmaxx() / 2+x2;
y2 = getmaxy() / 2+y2;
axis();
getch();
}

void axis()
{
midx=getmaxx() / 2;
midy=getmaxy() / 2;
line(0,midy,midx*2,midy);
line(midx,0,midx,midy*2);
rectangle(x1,y1,x2,y2);
}

void main()
{
int ch,gd=DETECT,gm;
initgraph(&gd,&gm,"c:\\tc\\bgi");
get();
do
{
cleardevice();
outtextxy(10,10,"1)TRANSLATION");
outtextxy(10,20,"2)SCALING");
outtextxy(10,30,"3)ROTATION");
outtextxy(10,40,"4)SHEARING");
outtextxy(10,50,"5)REFLECTION");
outtextxy(10,60,"6)EXIT");
outtextxy(10,70,"ENTER UR CHOICE:");
scanf("%d",&ch);
switch(ch)
{
case 1:
translation();
break;
case 2:
scaling();
break;
case 3:
rotation();
break;
case 4:
shearing();
break;
case 5:
reflection();
break;
case 6:
exit(0);
}
}while(ch<6);
}

OUTPUT: