glc_trackballmover.cpp

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/****************************************************************************

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 Version 2.0.0, packaged on July 2010.

 http://glc-lib.sourceforge.net

 GLC-lib is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 3 of the License, or
 (at your option) any later version.

 GLC-lib is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with GLC-lib; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *****************************************************************************/

#include "glc_trackballmover.h"
#include "glc_viewport.h"

// Default constructor
GLC_TrackBallMover::GLC_TrackBallMover(GLC_Viewport* pViewport, const QList<GLC_RepMover*>& repsList)
: GLC_Mover(pViewport, repsList)
, m_Ratio(0.95)
{
        GLC_Mover::m_MoverInfo.m_MatrixInfo.append(GLC_Matrix4x4());
        GLC_Mover::m_MoverInfo.m_VectorInfo.append(GLC_Vector3d());
}

// Copy constructor
GLC_TrackBallMover::GLC_TrackBallMover(const GLC_TrackBallMover& mover)
: GLC_Mover(mover)
, m_Ratio(mover.m_Ratio)
{

}

GLC_TrackBallMover::~GLC_TrackBallMover()
{

}

// Get Functions

// Return a clone of the mover
GLC_Mover* GLC_TrackBallMover::clone() const
{
        return new GLC_TrackBallMover(*this);
}

// Set Functions

// Initialized the mover
void GLC_TrackBallMover::init(QMouseEvent * e)
{
        GLC_Mover::m_PreviousVector.setVect(mapForTracking(static_cast<double>(e->x()), static_cast<double>(e->y())));

        const double Angle= acos(glc::Z_AXIS * GLC_Mover::m_PreviousVector);
        const GLC_Vector3d AxeRot(glc::Z_AXIS ^ GLC_Mover::m_PreviousVector);

        GLC_Matrix4x4 Matrice(AxeRot, Angle);

        GLC_Mover::m_MoverInfo.m_MatrixInfo.first()= Matrice;
        GLC_Mover::m_MoverInfo.m_VectorInfo.first()= GLC_Mover::m_PreviousVector;
        // Update trackball representations
        initRepresentation();
}

// Move the camera
bool GLC_TrackBallMover::move(QMouseEvent * e)
{
        const GLC_Vector3d VectCurOrbit(mapForTracking(static_cast<double>(e->x()), static_cast<double>(e->y())));

        // Update camera position (orbit)
        GLC_Mover::m_pViewport->cameraHandle()->orbit(GLC_Mover::m_PreviousVector, VectCurOrbit);

        // Update arcs of circle's positionning matrix
        const GLC_Matrix4x4 MatRot(GLC_Mover::m_PreviousVector, VectCurOrbit);

        GLC_Mover::m_MoverInfo.m_MatrixInfo.first()= MatRot;
        updateRepresentation();

        // Previous vector become current vector
        GLC_Mover::m_PreviousVector = VectCurOrbit;

        return true;
}

// Private services Functions

// Convert mouse View coordinate to tracking coordinate (Centred and betwen (-1,-1) and (1,1))
GLC_Vector3d GLC_TrackBallMover::mapForTracking( double x, double y) const
{
        double AspectRatio;
        const double winHSize= static_cast<double>(GLC_Mover::m_pViewport->viewHSize());
        const double winVSize= static_cast<double>(GLC_Mover::m_pViewport->viewVSize());

        // Change origine and cover
        if (winHSize < winVSize)
        {
                AspectRatio= winVSize / winHSize;
                x= ( (x - winHSize  / 2.0 ) / ( winHSize / 2.0) ) / m_Ratio;
                y= AspectRatio * ( ( winVSize / 2.0 - y) / ( winVSize / 2.0 ) ) / m_Ratio;
        }
        else
        {
                AspectRatio= winHSize / winVSize;
                x= AspectRatio * ( (x - winHSize  / 2.0 ) / ( winHSize / 2.0) ) / m_Ratio;
                y= ( (winVSize / 2.0 - y) / (winVSize / 2.0 ) ) / m_Ratio;
        }

        // Distance between pick point and origine can't be over then 1 (1 is radius of orbit circle)
        GLC_Vector3d mousePos(x, y, 0.0);
        if (mousePos.length() > 1.0)
        {
                mousePos.setLength(1.0);
        }
        else
        {
                mousePos.setZ(sqrt(1.0 - mousePos.x() *  mousePos.x() - mousePos.y() * mousePos.y()));
        }

        return mousePos;

}