orbiter.h

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#ifndef _ORBITER_H
#define _ORBITER_H
 
#include "vec.h"
#include "mat.h"
 



class Orbiter
{
public:
    Orbiter( ) : m_center(), m_position(), m_rotation(), m_size(5), m_radius(5), m_width(1), m_height(1), m_fov(45) {}
    
    void lookat(  const Point& center, const float size );
    void lookat( const Point& pmin, const Point& pmax );
    
    Transform projection( const int width, const int height, const float fov );
    float znear( ) const;
    float zfar( ) const;
    
    void rotation( const float x, const float y );
    void translation( const float x, const float y );
    void move( const float z );
    
    Transform view( ) const;
    Transform projection( ) const;
    Transform viewport( ) const;
    
    void frame( const float z, Point& dO, Vector& dx, Vector& dy ) const;

    Point position( );
    vec3 translation( );
    vec2 rotation( );
        
    int read_orbiter( const char *filename );

    int write_orbiter( const char *filename );
    
    float radius() const { return m_radius;  }
    
protected:
    Point m_center;
    vec2 m_position;
    vec2 m_rotation;
    float m_size;
    float m_radius;
    
    float m_width;
    float m_height;
    float m_fov;
};

#endif