//*******PROGRAM FOR SHEARING******//
#include<graphics.h>
#include<stdlib.h>
#include<stdio.h>
#include<conio.h>
#include<iostream.h>
#include<dos.h>
#include<math.h>
int x1,y1,x2,y2,x,y,x3,y3,x4,y4,ch;
void main()
{
int gd = DETECT,gm,errorcode;
initgraph(&gd,&gm,"c:\tc\bgi");
errorcode = graphresult();
if(errorcode!=grOk)
{
printf("Graphics error:%sn",grapherrormsg(errorcode));
printf("press any key to halt:");
getch();
exit(1);
}
do
{
clrscr();
cout<<" #############MAIN-ENU###############n";
cout<<" SHEARINGn";
cout<<" 1.LINEn";
cout<<" 2.RECTANGLEn";
cout<<" 3.TRINGLEn";
cout<<"enter your choice:0 for exit:n";
cin>>ch;
switch(ch)
{
case 1:
cout<<"enter the value of line coordinates:";
cin>>x1>>y1>>x2>>y2;
cout<<"enter the value of shearing for x-axis:";
cin>>x;
cout<<"enter the value of shearing for y-axis:";
cin>>y;
cleardevice();
setcolor(4);
line(x1,y1,x2,y2);
cout<<"now hit a key to see shear in x_axis:";
getch();
setcolor(1);
line(x1,y1,x2*x,y2);
cout<<"nnow hit a key to see shear in y_axis:";
getch();
setcolor(58);
line(x1,y1,x2,y2*y);
getch();
break;
case 2:
cout<<"enter the top left coordinates:";
cin>>x1>>y1;
cout<<"enter the bottom right coordinates:";
cin>>x2>>y2;
cout<<"enter the value of shearing coordinates for x-shear:";
cin>>x;
cout<<"enter the value of shearing coordinates for y-shear:";
cin>>y;
cleardevice();
setcolor(5);
rectangle(x1,y1,x2,y2);
cout<<"now hit a key to see shear in x_axis:";
getch();
setcolor(1);
rectangle(x1,y1,x2+x*y2,y2);
cout<<"nnow hit a key to see shear in y_axis:";
getch();
setcolor(58);
rectangle(x1,y1,x2,y2+y*x2);
getch();
break;
case 3:
cout<<"enter the coordinates of triangle:n";
cin>>x1>>y1>>x2>>y2;
cin>>x3>>y3;
cout<<"enter the value of shearing coordinates for x-shear:";
cin>>x;
cout<<"enter the value of shearing coordinates for y-shear:";
cin>>y;
cleardevice();
setcolor(5);
line(x1,y1,x2,y2);
line(x1,y1,x3,y3);
line(x3,y3,x2,y2);
cout<<"nnow hit a key to see shear in x_axis:";
getch();
setcolor(10);
line(x1,y1,x2*x,y2);
line(x1,y1,x3*x,y3);
line(x3*x,y3,x2*x,y2);
cout<<"nnow hit a key to see shear in y_axis:";
getch();
setcolor(1);
line(x1,y1,x2,y2*y);
line(x1,y1,x3,y3*y);
line(x3,y3*y,x2,y2*y);
getch();
break;
case0:break;
default:cout<<"invalid choice";break;
}}while(ch!=0);
closegraph();
getch();
}