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 :