polygon.h

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#pragma once
 
#include "form.h"
#include <cmath>
#include <iostream>
#include <vector>
 
//------------------------------------------
 
class Polygon_old
{
  public:
    Polygon_old(int n);
    void append(const Point2D& a) { _v.push_back(a); }
    int number() const { return static_cast<int>(_v.size()); }
    float perimeter() const;
    bool operator<(const Polygon_old& rhs) const { return perimeter() < rhs.perimeter(); }
 
  private:
    std::vector<Point2D> _v;
};
 
//------------------------------------------
class Polygon : public Form
{
  public:
    Polygon(int n);
    Polygon(Polygon const&) = default; 
    
    
    std::string classname() const override
    {
        return "Polygon of with "+std::to_string(number())+" vertices";
    }
 
    void append(const Point2D& a) { _v.push_back(a); _peri=-1.0F; _area=-1.0F; }
 
    int number() const { return static_cast<int>(_v.size()); }
    
 
    float perimeter() const;
    
    float area() const override;
 
    bool operator<(const Polygon& rhs) const { return perimeter() < rhs.perimeter(); }
 
  private:
    std::vector<Point2D> _v;     
    mutable float   _peri;  
    mutable float   _area;  
};