Построить систему классов для описания плоских геометрических фигур

#include "stdafx.h"
#include <iostream>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include<conio.h>
#include<stdio.h>
using namespace std;
 
const double M_PI = 3.14;
class PGF{
double a[4][2], n, ax, ay, axn,ayn,axn1,axn2,ayn1,ayn2, cx, cy,  i;
double r;
int nf;
public:
void Vibor();
void Vvod();
void Perem();
void Izm_raz();
void Vrash();
void Vivod();
};
void main()
{ PGF a;
a.Vibor();
a.Vvod();
a.Vivod();
a.Perem();
a.Vivod();
a.Izm_raz();
a.Vivod();
a.Vrash();
a.Vivod();
}
//выбор фигуры
void PGF::Vibor()
{
cout<<endl;
cout<<"Viberite figuru: krug-1, kvadrat-2, priamoygolnik-3";
cout<<endl;
cin>>nf;
}
//создание
void PGF::Vvod()
{
if (nf==1)
{ cout<<endl;
cout<<"vvedite param kryga \n";
cout<<" cx=";
cin>>cx;cout<<" cy=";
cin>>cy;
cout<<" r=";
cin>>r;
cout<<endl;
}
if (nf==2)
{
cout<<endl;
cout<<"vvedite parametri kvadrata ";
cout<<endl;
cout<<"koordinati centra:\n cx=";
cin>>cx;
cout<<" cy=";
cin>>cy;
cout<<"vector ot centra do vershini:\n";
cout<<" ax=";
cin>>ax;cout<<" ay=";
cin>>ay;
}
if (nf==3)
{
cout<<endl;
cout<<"vvedite parametri priamoygolnika";
cout<<endl;
cout<<"koordinati centra:\n cx=";
cin>>cx;
cout<<" cy=";
cin>>cy;
cout<<"vector ot centra do vershini:\n";
cout<<" ax=";
cin>>ax;
cout<<" ay=";
cin>>ay;
}
}
//вывод
void PGF::Vivod()
{
cout<<"peremechenie figuri";
cout<<endl;
if (nf==1)
{cout<<endl;
cout<<"cx="<<cx<<" cy="<<cy<<" r="<<r;
cout<<endl;
}
if (nf==2)
{
cout<<endl;
cout<<"cx="<<cx<<" cy="<<cy<<" ax="<<ax<<" ay="<<ay;
cout<<endl;
cout<<endl;
}
if (nf==3)
{
cout<<endl;
cout<<"cx="<<cx<<" cy="<<cy<<" ax="<<ax<<" ay="<<ay;
cout<<endl;
}
}
//перемещение на плоскости
void PGF::Perem()
{ int sx,sy;
cout<<"vvedite koordinati smecheniea figuri";
cout <<endl;
cout<<"smechenie po X= ";
cin>>sx;
cout<<"smechenie po Y= ";
cin>>sy;
cx=cx+sx;
cy=cy+sy;
ax=ax+sx;
ay=ay+sy;
}
//изменение размеров
void PGF::Izm_raz()
{
double s,Ax,Ay,Bx,By,Cx,Cy,k,d,AB,BC;
if (nf==1)
{
cout<<"koeficient izmenenia radiysa kryga= ";
cout<<endl;
cin>>k;
r=r*k;
}
if (nf==2)
{
cout<<"koeficient izmenena rasstoiania do vershini kvadrata= ";
cout<<endl;
cin>>k;
ax=ax-cx;
ay=ay-cy;
ax=ax*k;
ay=ay*k;
ax=ax+cx;
ay=ay+cy;
}
if (nf==3)
{
cout<<"koeficient izmenena rasstoiania do vershini priamoygolnika= ";
cout<<endl;
cin>>k;
ax=ax-cx;
ay=ay-cy;
ax=ax*k;
ay=ay*k;
ax=ax+cx;
ay=ay+cy;
}
}
void PGF::Vrash()
{ double f,co,si;
cout<<"ygol povorota figuri (v gradysah)= ";
cin>>f;
f=f*M_PI/180;
if(nf==2 || nf==3)
{
ax=ax-cx;
ay=ay-cy;
co=cos(f);
si=sin(f);
axn1=ax*co;
axn2=ay*si;
axn=axn1-axn2;
ayn1=ax*si;
ayn2=ay*co;
ayn=ayn1+ayn2;
ax=axn+cx;
ay=ayn+cy;
}
}