#ifndef CAMERA_H
#define CAMERA_H

#include "rtweekend.hpp"

struct camera {
    /* Attributes */
    point3 origin;
    point3 lower_left_corner;
    vec3 horizontal;
    vec3 vertical;    
    
    /* Constructors */
    camera()
    {
        double aspect_ratio = 16.0 / 9;
        double viewport_height = 2.0;
        double viewport_width = aspect_ratio * viewport_height;
        double focal_length = 1.0;

        origin = vec3(0,0,0);
        horizontal = vec3(viewport_width, 0, 0);
        vertical = vec3(0, viewport_height, 0);
        lower_left_corner = origin - horizontal/2 - vertical/2 - vec3(0, 0, focal_length);        
    }

    /* Methods */    

    ray get_ray(double u, double v) const
    {
        return ray(origin, lower_left_corner + u*horizontal + v*vertical - origin);
    };
       
};

#endif