glViewAttrib.h

/********************************************************************/
/* Copyright (c) 2015 DG Technologies Inc. and Yuzi Mizuno          */
/* All rights reserved.                                             */
/********************************************************************/
#ifndef _MGGLViewAttrib_HH_
#define _MGGLViewAttrib_HH_

#include "mg/Position.h"
#include "mgGL/ConstructionPlane.h"
#include <iosfwd>

class MGOfstream;
class MGIfstream;
class MGBox;
class MGOpenGLView;


class MG_DLL_DECLR MGglViewAttrib{

public:
    
MG_DLL_DECLR friend std::ostream& operator<< (std::ostream& out, const MGglViewAttrib& atr);

MG_DLL_DECLR friend MGOfstream& operator<< (MGOfstream& buf, const MGglViewAttrib& atr);
MG_DLL_DECLR friend MGIfstream& operator>> (MGIfstream& buf, MGglViewAttrib& atr);

MGglViewAttrib(bool is_perspective=true);
MGglViewAttrib(const MGBox& box, const MGColor* gridColors=0);
MGglViewAttrib(const MGOpenGLView& glview);



void copy(const MGOpenGLView& glview);

const MGPosition& center()const{return m_center;};
MGPosition& center(){return m_center;};

void compute_viewing_environment(
    const MGBox& box
);

const MGConstructionPlane& cplane()const{return m_cplane;};
MGConstructionPlane& cplane(){return m_cplane;};

double diameter()const{return m_diameter;};
double& diameter(){return m_diameter;};

const MGPosition& eye_position()const{return m_eyeP;}
MGPosition& eye_position(){return m_eyeP;}

bool is_perspective() const{return m_perspective;};

void set_center(const MGPosition& pos){ m_center=pos;}

void setEyePositionUpVector(
    const MGPosition& eyeP,
    const MGVector& upVector
);

void set_fovy(double fovy){m_fovy=fovy;};

void setHomeMatrix();

void set_perspective(bool pers, double fovy=45.);

void set_view_up_vector(const MGVector& up){m_up_vector=up;};

MGCL::VIEWMODE viewMode()const{return m_viewMode;};

const MGVector& view_up_vector()const{return m_up_vector;};
MGVector& view_up_vector(){return m_up_vector;};

double view_volume_far()const{return m_far;}

double view_volume_height()const{return m_diameter/m_scale;}

double view_volume_near()const{return m_near;}

private:
    MGCL::VIEWMODE m_viewMode;
    MGConstructionPlane m_cplane;

    bool m_perspective; 
    double m_fovy;      

    double m_near, m_far;
    MGPosition m_eyeP;  
    MGVector m_up_vector;

    MGPosition m_center;
    double m_diameter;  

    double m_scale;     
    double m_cx, m_cy;  


    glm::mat4 m_PreCenterMat;
    glm::mat4 m_modelViewMat;


friend class MGOpenGLView;

};
#define INITIAL_SCALE 6.
 // end of DisplayHandling group
#endif