camera.h

#ifndef _CAMERA_H_
#define _CAMERA_H_

#include "vector3D.h"
#include "color.h"

class Camera
{
private:
	Vector3D position;
	Vector3D target; //Look-at point
	Vector3D up;

	Vector3D line_of_sight;
	Vector3D u, v, w; //Camera basis vectors

	unsigned char *bitmap;
    unsigned int width, height;
	float fovy;// expressed in degrees: FOV-Y; angular extent of the height of the image plane
	float focalDistance; //Distance from camera center to the image plane
	float focalWidth, focalHeight;//width and height of focal plane
	float aspect;
	int steps;

public:
	Camera(const Vector3D& _pos, const Vector3D& _target, const Vector3D& _up, float fovy, int w, int h);
	~Camera();
	const Vector3D get_ray_direction(const float i, const float j) const;
	const Vector3D& get_position() const { return position; }
	void drawPixel(int i, int j, Color c);
	unsigned char * getBitmap() {return bitmap; }
	unsigned int getWidth() {return width;}
    unsigned int getHeight(){return height;}
	void incSteps(){ steps++; }
	void resetSteps(){ steps=0; }
	int getSteps() const {
		return steps;
	}

	const Vector3D &getU() const;

	const Vector3D &getV() const;

	const Vector3D &getW() const;
};
#endif