Orbit.h

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#ifndef ExoViewer_Orbit_h
#define ExoViewer_Orbit_h

#include "OpenGL_Includes.h"
#include <math.h>
#include <vector>
#include <vmmlib/vmmlib.hpp>
#include "OrbitDrawable.h"
#include "Camera.h"

namespace geAstro{

//struct to hold orbit information, initalized to default values (earth orbit)
struct OrbitInfo
{
    double eccentricity = 0.01;
    double semimajorAxis = 1.0;
    double inclination = 0.0004;
    double longitudeOfAscendingNode = 135.08;
    double argumentOfPeriapsis = 236.73;
    double timeOfPeriapsis = 2451546.403877783101;
    double meanMotion = 0.985;
};

class Orbit
{
public: 
    Orbit();
    ~Orbit();
    void clear(); 
    void create(OrbitInfo orbitInfo, vmml::Vector3d _center,
        std::shared_ptr<ge::Shader> _programForOrbits, vmml::Vector3d _orbitColor,
        bool _smallBodiesAsPointCloud, unsigned int _uid, unsigned int _groupuid, bool _isRealScale, double _scaleFactor); // = UINT_MAX);

    void update(double _date, bool _isRealScale, double _scaleFactor);
    void draw(std::shared_ptr<ge::Camera> _cam);

    void setOrbitColor(vmml::Vector3f _orbitColor);
    void setVisible(bool visible);

    vmml::Vector3d getPositionOnEllipsis(double _angle) const;
    double getRadiusByTrueAnomaly(double _angle) const;

    vmml::Vector3d getCenterOfGravity() const;
    void setCenterOfGravity(vmml::Vector3d _pos);

    vmml::Vector3d getCurrentBodyPosition() const;
    const OrbitInfo& getOrbitData() const;
    const OrbitDrawable& getOrbitDrawable() const;

    void reloadShader(std::shared_ptr<ge::Shader> _programForOrbits);
    //double getPeriapsis(bool _scaled=false) const;

private:
    vmml::Vector3d rescale(bool _isRealScale, vmml::Vector3d _pos, double _scaleFactor) const;
    double computeTrueAnomaly(double _date);
    std::vector<vmml::Vector3d> getOrbitPoints(unsigned int _numberOfSegements, bool _isRealScale, double _scaleFactor) const;

    OrbitInfo orbitInfo;
    OrbitDrawable drawable;

    vmml::Vector3d centerOfGravity;
    vmml::Vector3d currentBodyLocation;

};

}

#endif