// interface for interactive camera 

#include<GL/glut.h>
#include<math.h>
#include<stdlib.h>
#include"vector3.h"

class camera
{
 public:

    // Member functions
    camera();                              //default constructor
    
    void set_view_volume(double viewandgle, double aspect_ratio,
       double near_plane, double far_plane);
    void set_camera_frame(vector3 eye, vector3 lookat, vector3 up); 
  
    // slide camera, specified by increments in each of the three directions
    void slide(double u_incrmnt, double v_incrmnt, double n_incrmnt);

    void roll(double angle);    //
    void pitch(double angle);   //  
    void yaw(double angle);     //

    // Member data made public so you could acces easy from your program
    vetor3 eye;           // camera position
    vector3 lookat;       // look at point

    vector3 n;            //
    vector3 u;            // camera frame
    vector3 v;            // 

    double viewandgle,   //
          aspect_ratio,  //
          near_plane,    // view volume
          far_plane;     //

   double zoom_factor;

private:
   set_view_mtrx();      

};