form.h

Go to the documentation of this file.

#ifndef FORM_H_INCLUDED
#define FORM_H_INCLUDED
 
#include <cmath>
#include <iostream>
#include <string>
//using namespace std;
 
class Form
{
public:
 
    Form(float x, float y) : _x(x), _y(y) {}
 
    Form(const Form &rhs) : _x(rhs._x), _y(rhs._y) {}
    //   Get center coordinates
    float GetX() const
    {
        return _x;
    }
    float GetY() const
    {
        return _y;
    }
    //   String with info
    virtual std::string classname() const
    {
        return "geometric form";
    }
    //   Area
    virtual float area() const = 0;
 
    virtual ~Form();
 
private:
    float _x, _y;  // Mittelpunktskoordinaten
};
 
//  class Quadrat (definieren)
class Quadrat: public Form
{
public:
    Quadrat(float x, float y, float seite) : Form(x,y), _edge(seite) {}
    std::string classname() const override
    {
        return "Square";
    }
    float area() const override;
 
private:
    float _edge;
};
 
class Circle: public Form
{
public:
    Circle(float x, float y, float radius) : Form(x,y), _radius(radius) {}
    std::string classname() const override
    {
        return "Circle";
    }
    float area() const override;
 
private:
    float _radius;
};
 
//  further operators (what is needed?)
 
bool operator<(const Form &a, const Form &b);
 
inline
float euclid_dist(const Form &a, const Form &b)
{
    return std::sqrt( (b.GetX()-a.GetX())*(b.GetX()-a.GetX()) + (b.GetY()-a.GetY())*(b.GetY()-a.GetY()) );
}
 
// via pointer arguments
bool kleiner(const Form *a, const Form *b);
 
inline
float euclid_dist(const Form *a, const Form *b)  // distance(iterator, iterator) exists already in STL !!
{
    std::cout << "###";
    return euclid_dist(*a, *b);
}
 
 
std::ostream& operator<<(std::ostream& s, const Form& rhs);
 
 
#endif // FORM_H_INCLUDED