x010.h

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#pragma once

#include "xerror.h"
#include "xtools.h"
#include <array>
#include <cmath>
#include <iostream>

namespace nmx::apps::x010 {
class Spring
{
private:
    double _k; //Federkonstante
    double _elongation = 0; //Auslenkung
    //Kraft, elastische potenzielle Energie
    double _force = 0, _ePotential = 0;

public:
    Spring(double k)
        : _k{ k } {
        if (_k <= 0) {
            throw std::domain_error(__func__);
        }
    }

    void set_elongation(double x) {
        _elongation = x; //neue Auslenkung
        _force = -_k * x; //aktualisiere Kraft
        //aktualisiere potenzielle Energie
        _ePotential = 0.5 * _k * pow(_elongation, 2);
    }

    double k() const { return _k; }

    double elongation() const { return _elongation; }

    double force() const { return _force; }

    double e_potential() const { return _ePotential; }

    auto values() const { //
        return std::array{ _elongation, _force, _ePotential };
    }

    inline static Spring add_paralell(const Spring &s1, const Spring &s2) {
        double k = s1.k() + s2.k();
        return Spring{ k }; //Kopierkonstruktor automatisch generiert
    }

    inline static Spring add_series(const Spring &s1, const Spring s2) {
        double tmp = 1. / s1.k() + 1. / s2.k();
        //Kopierkonstruktor automatisch generiert
        return Spring{ 1 / tmp };
    }
}; //Spring

inline void ex1() {
    const Spring s1{ 200 }, s2{ 100 }, s3{ 100 };
    Spring s = Spring::add_paralell(s1, s2);
    s = Spring::add_series(s3, s);
    //Auslenkung
    const double x = 0.10;
    std::cout << "k1=" << s1.k() << " N/m,";
    std::cout << "k2=" << s2.k() << " N/m,";
    std::cout << "k3=" << s3.k() << " N/m" << std::endl;
    std::cout << "k=" << s.k() << " N/m" << std::endl;
    //Feder wird gedehnt
    s.set_elongation(x);
    std::cout << "x=" << x << " m," //
              << "F=" << s.force() << " N," //
              << "U=" << s.e_potential() << " J" << std::endl;
}
} // namespace nmx::apps::x010