glc_zoommover.cpp

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00001 /****************************************************************************
00002 
00003  This file is part of the GLC-lib library.
00004  Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
00005  http://glc-lib.sourceforge.net
00006 
00007  GLC-lib is free software; you can redistribute it and/or modify
00008  it under the terms of the GNU Lesser General Public License as published by
00009  the Free Software Foundation; either version 3 of the License, or
00010  (at your option) any later version.
00011 
00012  GLC-lib is distributed in the hope that it will be useful,
00013  but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  GNU Lesser General Public License for more details.
00016 
00017  You should have received a copy of the GNU Lesser General Public License
00018  along with GLC-lib; if not, write to the Free Software
00019  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
00020 
00021  *****************************************************************************/
00022 
00023 #include "glc_zoommover.h"
00024 #include "glc_viewport.h"
00025 
00026 // Default constructor
00027 GLC_ZoomMover::GLC_ZoomMover(GLC_Viewport* pViewport, const QList<GLC_RepMover*>& repsList)
00028 : GLC_Mover(pViewport, repsList)
00029 , m_MaxZoomFactor(3.0)
00030 {
00031 
00032 }
00033 
00034 // Copy constructor
00035 GLC_ZoomMover::GLC_ZoomMover(const GLC_ZoomMover& mover)
00036 : GLC_Mover(mover)
00037 , m_MaxZoomFactor(mover.m_MaxZoomFactor)
00038 {
00039 
00040 }
00041 
00042 GLC_ZoomMover::~GLC_ZoomMover()
00043 {
00044 
00045 }
00046 
00047 
00049 // Get Functions
00051 
00052 // Return a clone of the mover
00053 GLC_Mover* GLC_ZoomMover::clone() const
00054 {
00055         return new GLC_ZoomMover(*this);
00056 }
00057 
00059 // Set Functions
00061 
00062 // Initialized the mover
00063 void GLC_ZoomMover::init(const GLC_UserInput& userInput)
00064 {
00065         // Change origine (view center) and cover between -1 and 1
00066         const double vSize= static_cast<double>(m_pViewport->viewVSize());
00067         m_PreviousVector.setY((vSize / 2.0 - userInput.y()) / ( vSize / 2.0));
00068 }
00069 
00070 // Move the camera
00071 bool GLC_ZoomMover::move(const GLC_UserInput& userInput)
00072 {
00073         // Change origine (View Center) and cover (from -1 to 1)
00074         const double vSize= static_cast<double>(m_pViewport->viewVSize());
00075         const double Posy= (vSize / 2.0 - userInput.y()) / ( vSize / 2.0);
00076 
00077         // Compute zoom factor between (1 / MAXZOOMFACTOR) and (MAXZOOMFACTOR)
00078         double ZoomFactor= Posy - m_PreviousVector.y();
00079 
00080         if (ZoomFactor > 0)
00081         {
00082                 ZoomFactor= (m_MaxZoomFactor - 1.0) * ZoomFactor + 1.0;
00083         }
00084         else
00085         {
00086                 ZoomFactor= 1.0 / ( (m_MaxZoomFactor - 1.0) * fabs(ZoomFactor) + 1.0 );
00087         }
00088 
00089         m_pViewport->cameraHandle()->zoom(ZoomFactor);
00090 
00091         m_PreviousVector.setY(Posy);
00092 
00093         return true;
00094 }

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©2005-2011 Laurent Ribon