glmtransform.hpp

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/*
 * ===========================================================================
 * PRODUCTION $Log: glmtransform.hpp,v $
 * PRODUCTION Revision 1000.0  2004/04/12 19:32:56  gouriano
 * PRODUCTION PRODUCTION: IMPORTED [CATCHUP_003] Dev-tree R1.1
 * PRODUCTION
 * ===========================================================================
 */

#ifndef GUI_OPENGL___GLM_TRANSFORM___HPP
#define GUI_OPENGL___GLM_TRANSFORM___HPP

/*  $Id: glmtransform.hpp,v 1000.0 2004/04/12 19:32:56 gouriano Exp $
 * ===========================================================================
 *
 *                            PUBLIC DOMAIN NOTICE
 *               National Center for Biotechnology Information
 *
 *  This software/database is a "United States Government Work" under the
 *  terms of the United States Copyright Act.  It was written as part of
 *  the author's official duties as a United States Government employee and
 *  thus cannot be copyrighted.  This software/database is freely available
 *  to the public for use. The National Library of Medicine and the U.S.
 *  Government have not placed any restriction on its use or reproduction.
 *
 *  Although all reasonable efforts have been taken to ensure the accuracy
 *  and reliability of the software and data, the NLM and the U.S.
 *  Government do not and cannot warrant the performance or results that
 *  may be obtained by using this software or data. The NLM and the U.S.
 *  Government disclaim all warranties, express or implied, including
 *  warranties of performance, merchantability or fitness for any particular
 *  purpose.
 *
 *  Please cite the author in any work or product based on this material.
 *
 * ===========================================================================
 *
 * Authors:  Mike DiCuccio, Vladimir Tereshkov
 *
 * File Description:  
 *   Arbitrary OpenGL Mouse transformations class based on CGlArcBall with addition of pan and zoom
 */


#include <corelib/ncbistd.hpp>

#include <gui/math/quat.hpp>
#include <gui/math/vect3.hpp>
#include <gui/math/matrix4.hpp>


BEGIN_NCBI_SCOPE

class CGlMTransform
{
  public:
    typedef CVect3<float> TVect;
    typedef CQuat<float>  TQuat;

    enum EMode {
        eRotate,
        ePan,
        eZoom,
        eTranslate, // pan+zoom
        eAll        // translate+rotate
    };

    // ctor
    CGlMTransform(void);
    // construct at a center and radius
    CGlMTransform(const TVect& center, float radius);
    // dtor
    ~CGlMTransform(void);

    // set the screen resolution
    void        Resolution(int x, int y);

    // place the world at a center and radius
    void        Place(const TVect& center, float radius);

    // place a world at a center, keeping the current radius
    void        Place(const TVect& center);

    // update the arc ball for a given mouse position
    void        Update(int x, int y);

    // begin a drag event
    void        BeginDrag(void);

    // end a drag event
    void        EndDrag(void);

    // determine if the arc ball is in a drag state
    bool        IsDragging(void) const;

    // apply the arcball using OpenGL
    void        ApplyGL(EMode mode = eAll) const;

    // mode switches
    void		Switch2Mode(int mode);
    void		Switch2Rotate();
    void		Switch2Pan();
    void		Switch2Zoom();

    CGlMTransform&    operator= (const CGlMTransform&);
    CGlMTransform(const CGlMTransform&);

    // access the current rotation matrix
    const CMatrix4<float>&   GetMatrix() const      { return m_MatNow; }

    // access the current translation vector
    const CVect3<float>&     GetTranslation() const { return m_Translate; }

  private:
    // current mode
    EMode m_Mode;

    // boolean flag: are we dragging?
    bool         m_IsDragging;

    // screen resolution
    int          m_ScreenX;
    int          m_ScreenY;

    // current mouse position(in scaled coordinates)
    float        m_MouseX;
    float        m_MouseY;

    // mouse position at the start of the drag cycle
    CVect4 < float> m_DragFrom;

    // center of the arcball world
    CVect4 < float> m_Center;

    // radius of the arcball world
    float        m_Radius;

    // quaternions for rotation
    TQuat m_QuatNow;
    TQuat m_QuatDown;
    TQuat m_QuatDrag;

    // current rotation matrix
    CMatrix4<float> m_MatNow;

    // zoom and pan
    CVect3<float> m_Translate;
    CVect3<float> m_TranslateDown;

    // convert screen coordinates to sphere coordinates
    CVect4<float>    x_ToSphere(float x, float y);
};


// 
// set the screen resolution
inline
void CGlMTransform::Resolution(int x, int y)
{
    m_ScreenX = x;
    m_ScreenY = y;
}

//
// determine if the arc ballis being dragged
//
inline
bool CGlMTransform::IsDragging(void) const
{
    return m_IsDragging;
}

// mode setup functions 
inline
void CGlMTransform::Switch2Mode(int mode)
{
	m_Mode = static_cast<EMode>(mode);
}

inline
void CGlMTransform::Switch2Rotate()
{
	m_Mode = eRotate;
}

inline
void CGlMTransform::Switch2Pan()
{
	m_Mode = ePan;
}

inline
void CGlMTransform::Switch2Zoom()
{
	m_Mode = eZoom;
}
    

END_NCBI_SCOPE


/*
 * ===========================================================================
 * $Log: glmtransform.hpp,v $
 * Revision 1000.0  2004/04/12 19:32:56  gouriano
 * PRODUCTION: IMPORTED [CATCHUP_003] Dev-tree R1.1
 *
 * Revision 1.1  2004/01/05 16:20:49  tereshko
 * Initial revision
 *
 * ===========================================================================
 */

#endif  // GUI_OPENGL___GLM_TRANSFORM___HPP