camera.h

#ifndef CAMERA_H
#define CAMERA_H

#include "mathlib.h"

class STOASTLIB Camera
{
    public:
    Camera()
        {
        pixelSize = 1.0;
        }
    Camera( int w_, int h_,
        const RVector & pos_, 
        const RVector & x_, const RVector & y_, const RVector & z_,
        double pixSize = 1.0)
        : w(w_), h(h_), pos(pos_), x(x_), y(y_), z(z_), pixelSize(pixSize)
        {
        }
    void init(int w_, int h_, double f_, 
        const RVector & pos_, 
        const RVector & x_, const RVector & y_, const RVector & z_)
    {
        w=w_; h=h_;
        pos=pos_; x=x_; y=y_; z=z_;
    }
    virtual void getRayVector(const double ix, const double iy, RVector & rayStart, RVector & rayDir) const = 0;
    virtual void getPixelCoords(const RVector & p, double & ix, double & iy) const = 0;
    RVector getPos() const {return pos;}
    RVector getUp() const {return y;}
    RVector getViewDir() const {return z;}
    int getImageWidth() const {return w;}
    int getImageHeight() const {return h;}
    double getAspect() const;
    virtual double getFoVy() const { return 0; }
    double getPixelSize() {return pixelSize;}

    protected:
    int w, h;
    RVector pos, x, y, z;
    double pixelSize;
};

class STOASTLIB PinholeCamera : public Camera
{
    public:
    PinholeCamera(){}
    PinholeCamera(  int w_, int h_, double f_, 
            const RVector & pos_, 
            const RVector & x_, const RVector & y_, 
            const RVector & z_,
            double pixSize = 1.0)
        : Camera(w_, h_, pos_, x_, y_, z_, pixSize), f(f_)
        {
        }
    void getRayVector(const double ix, const double iy, RVector & rayStart, RVector & rayDir) const;
    void getPixelCoords(const RVector & p, double & ix, double & iy) const;
    double getFoVy() const; 

    protected:
    double f;   
};

class STOASTLIB OrthoCamera : public Camera
{
    public:
    OrthoCamera(){}
    OrthoCamera(int w_, int h_, double pixSize,
        const RVector & pos_, 
        const RVector & x_, const RVector & y_, const RVector & z_)
        : Camera(w_, h_, pos_, x_, y_, z_, pixSize)
    {
    }
    void getRayVector(const double ix, const double iy, RVector & rayStart, RVector & rayDir) const;
    void getPixelCoords(const RVector & p, double & ix, double & iy) const;
};

#endif