glc_zoommover.cpp

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

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 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_zoommover.h"
#include "glc_viewport.h"

// Default constructor
GLC_ZoomMover::GLC_ZoomMover(GLC_Viewport* pViewport, const QList<GLC_RepMover*>& repsList)
: GLC_Mover(pViewport, repsList)
, m_MaxZoomFactor(3.0)
{

}

// Copy constructor
GLC_ZoomMover::GLC_ZoomMover(const GLC_ZoomMover& mover)
: GLC_Mover(mover)
, m_MaxZoomFactor(mover.m_MaxZoomFactor)
{

}

GLC_ZoomMover::~GLC_ZoomMover()
{

}


// Get Functions

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

// Set Functions

// Initialized the mover
void GLC_ZoomMover::init(const GLC_UserInput& userInput)
{
        // Change origine (view center) and cover between -1 and 1
        const double vSize= static_cast<double>(m_pViewport->viewVSize());
        m_PreviousVector.setY((vSize / 2.0 - userInput.y()) / ( vSize / 2.0));
}

// Move the camera
bool GLC_ZoomMover::move(const GLC_UserInput& userInput)
{
        // Change origine (View Center) and cover (from -1 to 1)
        const double vSize= static_cast<double>(m_pViewport->viewVSize());
        const double Posy= (vSize / 2.0 - userInput.y()) / ( vSize / 2.0);

        // Compute zoom factor between (1 / MAXZOOMFACTOR) and (MAXZOOMFACTOR)
        double ZoomFactor= Posy - m_PreviousVector.y();

        if (ZoomFactor > 0)
        {
                ZoomFactor= (m_MaxZoomFactor - 1.0) * ZoomFactor + 1.0;
        }
        else
        {
                ZoomFactor= 1.0 / ( (m_MaxZoomFactor - 1.0) * fabs(ZoomFactor) + 1.0 );
        }

        m_pViewport->cameraHandle()->zoom(ZoomFactor);

        m_PreviousVector.setY(Posy);

        return true;
}