x012.h

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#pragma once

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

namespace nmx::apps::x012 {

class RightTriangle
{
private:
    //speichere Seiten
    std::array<double, 3> _sides;
    //speichere Winkel
    std::array<double, 3> _angles;
    //Fläche, Umfang
    double _area, _perimeter;

public:
    inline RightTriangle(double a, double b) {
        if (a <= 0.0 || b <= 0.0) {
            throw std::domain_error(__func__);
        }
        const double c = std::hypot(a, b);
        _sides = { a, b, c };
        _angles = { asin(a / c), asin(b / c), 0.5 * Math::PI };
        _area = 0.5 * a * b;
        _perimeter = a + b + c;
    }

    enum Idx { a, b, c };

    inline const auto &sides() const { return _sides; }

    inline auto side(Idx idx) const { return _sides.at(idx); }

    inline const auto &angles() const { return _angles; }

    inline auto angle(Idx idx) const { return _angles.at(idx); }

    inline double area() const { return _area; }

    inline double perimeter() const { return _perimeter; }

    friend std::ostream &operator<<(std::ostream &os, const RightTriangle &t) {
        using Idx = RightTriangle::Idx;
        os << "{" << t.side(Idx::a) << ",";
        os << t.side(Idx::b) << ",";
        os << t.side(Idx::c) << "}" << std::endl;
        os << "{" << t.angle(Idx::a) << ",";
        os << t.angle(Idx::b) << ",";
        os << t.angle(Idx::c) << "}" << std::endl;
        os << "{" << t.area() << "," //
           << t.perimeter() << "}" << std::endl;
        return os;
    }
}; //RightTriangle

inline void ex1() {
    using Triangle = RightTriangle;
    Triangle tr0{ 1, 2 };
    std::cout << tr0;
    //kopiere Dreieck
    Triangle tr1 = tr0;
    std::cout << "-------------------------------\n";
    std::cout << tr1;
}

} // namespace nmx::apps::x012