Two Dimensional Transformations Algorithm |Computer Graphics Translate In C++

In this 2D Transformation it will perform Translation, scaling, Rotation, shearing Reflection. In these source code it has separate function for there operation example translation it has the function name translation().

Source code for translation Algorithm C Programming
#include
#include
#include
#include
int x1,y1,x2,y2;
void translation()
{
int tx,ty,xn1,xn2,yn1,yn2;
printf("Enter the Translation Vector:");
scanf("%d\n%d",&tx,&ty);
cleardevice();
outtextxy(400,100,"TRANSLATION");
xn1=x1+tx;
yn1=y1+ty;
xn2=x2+tx;
yn2=y2+ty;
line(x1,y1,x2,y2);
line(xn1,yn1,xn2,yn2);
getch();
}
void scaling()
{
int xn1,yn1,xn2,yn2;
float sx,sy;
printf("Enter the Sacling Factor:");
scanf("%f\n%f",&sx,&sy);
cleardevice();
outtextxy(300,200,"SCALING");
xn1=x1*sx;
yn1=y1*sy;
xn2=x2*sx;
yn2=y2*sy;
line(x1,y1,x2,y2);
line(xn1,yn1,xn2,yn2);
getch();
}
void rotation()
{
int r;
float rx,xn1,yn1,xn2,yn2;
printf("Enter the Angle for Rotation:");
scanf("%d",&r);
cleardevice();
outtextxy(500,200,"ROTATION");
rx=(r*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);
line(x1,y1,x2,y2);
line(xn1,yn1,xn2,yn2);
getch();
}
void shearing()
{
int sh;
float xn1,yn1,xn2,yn2;
printf("Enter the value of Shearing");
scanf("%d",&sh);
cleardevice();
outtextxy(500,100,"SHEARING");
xn1=x1+sh*y1;
yn1=y1;
xn2=x2+sh*y2;
yn2=y2;
line(x1,y1,x2,y2);
line(xn1,yn1,xn2,yn2);
getch();
}
void reflection()
{
int xn1,yn1,xn2,yn2;
cleardevice();
outtextxy(300,100,"REFLECTION");
if((x1Output Algorithm 2D Transformation CS1355-Graphics and Multimedia Lab
Translation, scaling, Rotation, shearing Reflection,