Viewpoint.h

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#pragma once


#include "PortablePicture.h"

class Viewpoint
{
public:
    Viewpoint() {}
/*
 * Mutators
 */
    void setExtrinsics (const ColVector3 up_vector, const Vertex center_of_projection, const Vertex lookat_point);

    void setIntrinsics (double vert_fov, double width_over_height, double near_plane, double far_plane) ;

    void loadFromFiles (const char *photo_filename, const char *silhouette_filename /* can be NULL */);


/*
 * Accessors
 */
    unsigned int getWidth()        const { return photo.getWidth(); }

    unsigned int getHeight()       const { return photo.getHeight(); }

    Vertex getLookatPoint()        const { return lookatPoint; }

    Vertex getCenterOfProjection() const { return COP; }

    ColVector3 getUpVector()       const { return upVector; }

    double getDistanceToObject()   const 
    {   
        ColVector3 diff = COP - lookatPoint;
        return diff.getLength();
    }

    RgbByte colorAt (unsigned int u, unsigned int v) const { return photo.at(v,u); }

    bool pixelIsTransparent (unsigned int u, unsigned int v) const
    {
        if (!bHasSilhouette) return false;
        return (silhouette.at(v,u) == RgbByte(0,0,0));        
    }

    bool hasSilhouette () const { return bHasSilhouette; }

/*
 * Methods
 */
    double *getModelviewMatrix () const;

    double *getProjectionMatrix() const;

    std::vector< unsigned int > imageBuffer;

    PortablePixMap photo;

private:

    // extrinsic camera information
    ColVector3 upVector;
    Vertex COP;
    Vertex lookatPoint;

    // intrinsic camera information
    double verticalFOV;
    double widthOverHeight; // aka aspect ratio
    double nearPlane;       // aka focal length
    double farPlane;  // we calculate this ourselves

    Matrix4x4d modelview;
    Matrix4x4d projection;

    // image data
    PortablePixMap silhouette;
    bool bHasSilhouette;
};

class ViewpointList : public std::vector< Viewpoint > 
{
public:
    ViewpointList() {}

    void loadFromFile (const char *filename);

private:
    void loadSettingsFromCol (const char *filename);
    void loadSettingsFromXml(const char *filename);
};

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