Computer Graphics (CG) : Write C++ program to draw 2-D object and perform transformation [Scaling,Translation & Rotation].Apply the concept of operator overloading.

 

 Computer Graphics Assignment 4

Write C++ program to draw 2-D object and perform following basic transformation

a) Scaling

b) Translation

c) Rotation

Apply the concept of operator overloading.

Code :

#include<iostream>
#include<graphics.h>
#include<math.h>
using namespace std;
class transform
{
public:
int m,a[20][20],c[20][20];
int i,j,k;
public:
void object();
void accept();
void operator *(float b[20][20])
{
for(int i=0;i<m;i++)
{
for(int j=0;j<m;j++)
{
c[i][j]=0;
for(int k=0;k<m;k++)
{
c[i][j]=c[i][j]+(a[i][k]*b[k][j]);
}
}
}
}
};
void transform::object()
{
int gd,gm;
gd=DETECT;
initgraph(&gd,&gm,NULL); 
   line(300,0,300,600);
   line(0,300,600,300);
    for( i=0;i<m-1;i++)
    {
    line(300+a[i][0],300-a[i][1],300+a[i+1][0],300-a[i+1][1]);
}
line(300+a[0][0],300-a[0][1],300+a[i][0],300-a[i][1]);
for( i=0;i<m-1;i++)
{
line(300+c[i][0],300-c[i][1],300+c[i+1][0],300-c[i+1][1]);
}
line(300+c[0][0],300-c[0][1],300+c[i][0],300-c[i][1]);
int temp;
cout << "Press 1 to continue";
cin >> temp;
closegraph();
}
void transform::accept()
{
cout<<"\n";
 cout<<"Enter the Number Of Edges:";
    cin>>m;
    cout<<"\nEnter The Coordinates :";
    for(int i=0;i<m;i++)
    {
    for(int j=0;j<3;j++)
    {
    if(j>=2)
    a[i][j]=1;
    else
    cin>>a[i][j];
}
}
}
int main()
{
int ch,tx,ty,sx,sy;
float deg,theta,b[20][20];
transform t;
t.accept();
    cout<<"\nEnter your choice";
    cout<<"\n1.Translation"
          "\n2.Scaling"
  "\n3.Rotation";
  cin>>ch;
switch(ch)
{
case 1: cout<<"\nTRANSLATION OPERATION\n";
        cout<<"Enter value for tx and ty:";
        cin>>tx>>ty;
        b[0][0]=b[2][2]=b[1][1]=1;
b[0][1]=b[0][2]=b[1][0]=b[1][2]=0;
b[2][0]=tx;
b[2][1]=ty;
t * b;
t.object();
break;
    case 2: cout<<"\nSCALING OPERATION\n";
        cout<<"Enter value for sx,sy:";
        cin>>sx>>sy;
        b[0][0]=sx;
        b[1][1]=sy;
        b[0][1]=b[0][2]=b[1][0]=b[1][2]=0;
        b[2][0]=b[2][1]=0;
b[2][2] = 1;
t * b;
t.object();
break;
case 3: cout<<"\nROTATION OPERATION\n";
        cout<<"Enter value for angle:";
        cin>>deg;
theta=deg*(3.14/100);
b[0][0]=b[1][1]=cos(theta);
b[0][1]=sin(theta);
b[1][0]=sin(-theta);
b[0][2]=b[1][2]=b[2][0]=b[2][1]=0;
b[2][2]=1;
t * b;
t.object();
break;
default:
    cout<<"\nInvalid choice";
}
   getch();
   
   return 0;    
}



Input :

Provided In Image Given Below

Output :

For Tranlation :


For Scaling :


For Rotation :






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