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/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
*      Copyright (C) 2001-2010 by Computer Graphics Group, RWTH Aachen       *
*                           www.openflipper.org                              *
*                                                                            *
*--------------------------------------------------------------------------- *
*  This file is part of OpenFlipper.                                         *
*                                                                            *
*  OpenFlipper 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 with the               *
*  following exceptions:                                                     *
*                                                                            *
*  If other files instantiate templates or use macros                        *
*  or inline functions from this file, or you compile this file and          *
*  link it with other files to produce an executable, this file does         *
*  not by itself cause the resulting executable to be covered by the         *
*  GNU Lesser General Public License. This exception does not however        *
*  invalidate any other reasons why the executable file might be             *
*  covered by the GNU Lesser General Public License.                         *
*                                                                            *
*  OpenFlipper 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 LesserGeneral Public           *
*  License along with OpenFlipper. If not,                                   *
*  see <http://www.gnu.org/licenses/>.                                       *
*                                                                            *
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\*===========================================================================*/

/*===========================================================================*\
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*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                                *
*   $Date$                     *
*                                                                            *
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\*===========================================================================*/
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//=============================================================================
//
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//  CLASS glViewer - IMPLEMENTATION
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//
//=============================================================================


//== INCLUDES =================================================================

#include "QtBaseViewer.hh"
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#include "QtGLViewerLayout.hh"
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#include "CursorPainter.hh"
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#include <ACG/QtWidgets/QtWheel.hh>
#include <ACG/Scenegraph/DrawModes.hh>
#include <ACG/GL/gl.hh>

#include <iostream>
#include <string>
#include <assert.h>

#include <QMimeData>
#include <QToolButton>
#include <QFrame>

#include <QClipboard>
#include <QApplication>
#include <QSplitter>
#include <QLayout>
#include <QPushButton>
#include <QLabel>
#include <QImage>
#include <QColorDialog>
#include <QFileDialog>
#include <QToolTip>
#include <QTextStream>
#include <QDateTime>
#include <QTimer>

#include <QDesktopWidget>
#include <QMouseEvent>
#include <QVBoxLayout>
#include <QKeyEvent>
#include <QGridLayout>
#include <QContextMenuEvent>
#include <QWheelEvent>
#include <QDropEvent>
#include <QPixmap>
#include <QMenu>
#include <QVariant>
#include <QButtonGroup>
#include <QToolBar>

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#include <QGraphicsView>
#include <QGraphicsScene>
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#include <QGraphicsWidget>
#include <QGraphicsGridLayout>
#include <QGraphicsProxyWidget>
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#include <QGLFramebufferObjectFormat>
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#include <QPainter>
#include <QPaintEngine>
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#ifdef max
#  undef max
#endif

#ifdef min
#  undef min
#endif

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#include <OpenFlipper/BasePlugin/PluginFunctions.hh>
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#include <OpenFlipper/common/ViewObjectMarker.hh>
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#include <OpenFlipper/common/GlobalOptions.hh>

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#include <QGLFramebufferObject>

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//== NAMESPACES ===============================================================



//== IMPLEMENTATION ==========================================================

static const char          VIEW_MAGIC[] =
  "ACG::QtWidgets::QGLViewerWidget encoded view";

//== IMPLEMENTATION ==========================================================


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glViewer::glViewer( QGraphicsScene* _scene,
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                    QGLWidget* _glWidget,
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                    Viewer::ViewerProperties& _properties,
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                    QGraphicsWidget* _parent) :
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  QGraphicsWidget(_parent),
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  glareaGrabbed_(false),
  projectionUpdateLocked_(false),
  blending_(true),
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  glScene_(_scene),
  glWidget_(_glWidget),
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  cursorPainter_(0),
  cursorPositionValid_(false),
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  pProgram_(0),
  philipsStereoInitialized_(false),
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  pickCache_(0),
  updatePickCache_(true),
  pickCacheSupported_(true),
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  clickEvent_(QEvent::MouseButtonPress, QPoint (), Qt::NoButton, Qt::NoButton, Qt::NoModifier),
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  properties_(_properties),
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  glstate_(0),
  initialized_(false)
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{

  // widget stuff
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  createWidgets();
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  // bind GL context to GL state class
  glstate_ = new ACG::GLState();
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  properties_.setglState( glstate_ );

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  // state
  orthoWidth_       = 2.0;
  isRotating_       = false;
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  lookAround_       = false;
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  near_             = 0.1;
  far_              = 100.0;

  sceneGraphRoot_   = 0;

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  normalsMode_      = NORMALIZE_NORMALS;
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  projectionMode_   = PERSPECTIVE_PROJECTION;
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  navigationMode_   = NORMAL_NAVIGATION;
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  trackMouse_ = false;

  // stereo
  stereo_ = false;

  // Note: we start locked (initialization of updateLocked_)
  // will be unlocked in initializeGL()

  QSizePolicy sp = sizePolicy();
  sp.setHorizontalPolicy( QSizePolicy::Expanding );
  sp.setVerticalPolicy( QSizePolicy::Expanding );
  sp.setHorizontalStretch( 1 );
  sp.setVerticalStretch( 1 );
  setSizePolicy( sp );

  redrawTime_.start ();

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  // timer for animation
  timer_ = new QTimer( this );
  connect( timer_, SIGNAL(timeout()), this, SLOT( slotAnimation()) );

  allowRotation_ = true;


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  connect( &properties_,SIGNAL(updated()), this, SLOT( slotPropertiesUpdated() ) );


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  //check for updated properties once
  slotPropertiesUpdated();

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  setAcceptDrops(true);
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  setHome();
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  // initialize custom anaglyph stereo
  agTexWidth_ = 0;
  agTexHeight_ = 0;
  agTexture_[0] = 0;
  agTexture_[1] = 0;
  agProgram_ = 0;
  customAnaglyphSupported_ = false;
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  clickTimer_.setSingleShot (true);
  connect (&clickTimer_, SIGNAL(timeout ()), this, SLOT(slotClickTimeout ()));
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}


//-----------------------------------------------------------------------------


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glViewer::~glViewer()
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{
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  finiCustomAnaglyphStereo ();
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  delete glstate_;
}


//-----------------------------------------------------------------------------


QSize
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glViewer::sizeHint() const
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{
  return QSize( 600, 600 );
}

//-----------------------------------------------------------------------------


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void glViewer::makeCurrent() {
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  glWidget_->makeCurrent();
}

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void glViewer::swapBuffers() {
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  glWidget_->swapBuffers();
}


//-----------------------------------------------------------------------------


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void glViewer::sceneGraph(ACG::SceneGraph::BaseNode* _root, const bool _resetTrackBall)
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{
  sceneGraphRoot_ = _root;

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  if (sceneGraphRoot_ )
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  {
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    // set max number of render pass
    // Single pass action, this info is static during multipass
    ACG::SceneGraph::MultiPassInfoAction info_act;
    ACG::SceneGraph::traverse(sceneGraphRoot_, info_act);
    
    glstate_->set_max_render_passes(info_act.getMaxPasses());
    
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    // get scene size
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    // Single pass action, as the bounding box is not influenced by multipass traversal
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    ACG::SceneGraph::BoundingBoxAction act;
    ACG::SceneGraph::traverse(sceneGraphRoot_, act);

    ACG::Vec3d bbmin = (ACG::Vec3d) act.bbMin();
    ACG::Vec3d bbmax = (ACG::Vec3d) act.bbMax();
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    if ( ( bbmin[0] > bbmax[0] ) ||
         ( bbmin[1] > bbmax[1] ) ||
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         ( bbmin[2] > bbmax[2] )   ) {
      
      // Invalid bounding box, try to recover
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      setScenePos( ACG::Vec3d( 0.0,0.0,0.0 ) , 1.0, _resetTrackBall );
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      // Update bounding box to match the scene geometry after recovery
      bbmin = ACG::Vec3d(-1.0,-1.0,-1.0);
      bbmax = ACG::Vec3d( 1.0, 1.0, 1.0);
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    } else {
      
      // For small scenes, we set the scene radius to 10
      // otherwise we take the real radius
      if ( ( bbmax - bbmin ).max() < 10.0 )  {
        setScenePos( ( bbmin + bbmax )        * 0.5,
                     10.0,
                     _resetTrackBall);
                   
      } else {
        setScenePos( ( bbmin + bbmax )        * 0.5,
                     ( bbmax - bbmin ).norm() * 0.5,
                     _resetTrackBall); 
      }
                   
    }
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    // remember the new bounding box for the state
    glstate_->set_bounding_box(bbmin,bbmax);
    
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  }
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  updateGL();

  emit(signalSceneGraphChanged(sceneGraphRoot_));
}


//-----------------------------------------------------------------------------


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void glViewer::trackMouse(bool _track)
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{
  trackMouse_ = _track;
}


//-----------------------------------------------------------------------------

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void glViewer::perspectiveProjection()
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{
  projectionMode(PERSPECTIVE_PROJECTION);
  updateGL();
}


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void glViewer::orthographicProjection()
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{
  projectionMode(ORTHOGRAPHIC_PROJECTION);
  updateGL();
}


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void glViewer::toggleProjectionMode()
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{
  if (projectionMode_ == ORTHOGRAPHIC_PROJECTION)
    projectionMode(PERSPECTIVE_PROJECTION);
  else
    projectionMode(ORTHOGRAPHIC_PROJECTION);

  updateGL();
}


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void glViewer::projectionMode(ProjectionMode _p)
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{
  if ((projectionMode_ = _p) == ORTHOGRAPHIC_PROJECTION)
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    emit projectionModeChanged( true );
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  else
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    emit projectionModeChanged( false );
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  updateProjectionMatrix();
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  emit viewChanged();
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}

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void glViewer::toggleNavigationMode()
{
  if (navigationMode_ == NORMAL_NAVIGATION)
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    navigationMode(FIRSTPERSON_NAVIGATION);
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  else
    navigationMode(NORMAL_NAVIGATION);
}


void glViewer::navigationMode(NavigationMode _n)
{
  if ((navigationMode_ = _n) == NORMAL_NAVIGATION)
    emit navigationModeChanged( true );
  else
    emit navigationModeChanged( false );
}

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void glViewer::setFOVY(double _fovy) {
    
  if(_fovy <= 0.0 || _fovy >= 180) {
    std::cerr << "Error: Minimum or maximum fovy angle exceeded!" << std::endl;
    return;
  }
  
  OpenFlipperSettings().setValue("Core/Projection/FOVY", _fovy);
  updateProjectionMatrix();
}

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void glViewer::updateProjectionMatrix()
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{
  if( projectionUpdateLocked_ )
    return;

  makeCurrent();

  glstate_->reset_projection();

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  // In scereo mode we have to use a perspective matrix
  if (stereo_ || projectionMode_ == PERSPECTIVE_PROJECTION)
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  {
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    double aspect;

    if (isVisible() && glWidth() && glHeight())
      aspect = (double) glWidth() / (double) glHeight();
    else
      aspect = 1.0;

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    // Get fovy
    double fovy = OpenFlipperSettings().value("Core/Projection/FOVY", 45.0).toDouble();

    glstate_->perspective(fovy, (GLdouble) aspect,
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                          near_, far_);
  }
  else
  {
    double aspect;
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    if (isVisible() && glWidth() && glHeight())
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      aspect = (double) glWidth() / (double) glHeight();
    else
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      aspect = 1.0;
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    glstate_->ortho( -orthoWidth_, orthoWidth_,
                     -orthoWidth_/aspect, orthoWidth_/aspect,
                     near_, far_ );
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  }
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}


//-----------------------------------------------------------------------------


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void glViewer::setScenePos(const ACG::Vec3d& _center, double _radius, const bool _resetTrackBall)
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{
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  if(_resetTrackBall) {
    trackball_center_ = _center;
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  }

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  scene_center_ = _center;

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  scene_radius_ = trackball_radius_ = _radius;

  ACG::Vec3d c = glstate_->modelview().transform_point(scene_center_);

  // Set far plane
  far_    = std::max(0.0002f * scene_radius_,  -(c[2] - scene_radius_));
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  // Set near plane
  near_   = std::max(0.0001f * scene_radius_,  -(c[2] + scene_radius_));
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  updateProjectionMatrix();
  updateGL();

  emit viewChanged();
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}

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//-----------------------------------------------------------------------------

void glViewer::setSceneCenter( const ACG::Vec3d& _center ) {

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	scene_center_ = _center;
}

//-----------------------------------------------------------------------------

void glViewer::setTrackBallCenter( const ACG::Vec3d& _center ) {
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  trackball_center_ = _center;
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}
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//----------------------------------------------------------------------------


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void glViewer::viewingDirection( const ACG::Vec3d& _dir, const ACG::Vec3d& _up )
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{
  // calc eye point for this direction
  ACG::Vec3d eye = scene_center_ - _dir*(3.0*scene_radius_);

  glstate_->reset_modelview();
  glstate_->lookAt((ACG::Vec3d)eye, (ACG::Vec3d)scene_center_, (ACG::Vec3d)_up);
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  emit viewChanged();
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}

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//-----------------------------------------------------------------------------

void glViewer::lookAt(const ACG::Vec3d& _eye, const ACG::Vec3d& _center, const ACG::Vec3d& _up) {
    
    glstate_->reset_modelview();
    glstate_->lookAt(_eye, _center, _up);
    
    scene_center_ = _center;
    scene_radius_ = (scene_center_ - _eye).norm();
    
    emit viewChanged();
}
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//-----------------------------------------------------------------------------

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void glViewer::normalsMode(NormalsMode _mode)
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{
  makeCurrent();

  switch(normalsMode_ = _mode)
  {
    case DONT_TOUCH_NORMALS:
      glDisable(GL_NORMALIZE);
      break;

    case NORMALIZE_NORMALS:
      glEnable(GL_NORMALIZE);
      break;
  }

  updateGL();
}


//-----------------------------------------------------------------------------


void
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glViewer::copyToImage( QImage& _image,
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		       unsigned int _l, unsigned int _t,
		       unsigned int _w, unsigned int _h,
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			   GLenum /* _buffer */ )
{
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//    qApp->processEvents();
//    makeCurrent();

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  _image = glWidget_->grabFrameBuffer(true).copy (_l, _t, _w, _h).convertToFormat (QImage::Format_RGB32);
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}


//-----------------------------------------------------------------------------


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void glViewer::updateGL()
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{
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  if (!properties_.updateLocked() && isVisible() )
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  {
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    updatePickCache_ = true;
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    update();
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    emit viewUpdated();
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  }
}



//-----------------------------------------------------------------------------


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void glViewer::drawScene()
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{
  QTime  timer;
  timer.start();


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  // *****************************************************************
  // Adjust clipping planes
  // *****************************************************************
  // Far plane
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  ACG::Vec3d c = glstate_->modelview().transform_point(scene_center_);
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  // Set far plane
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  far_    = std::max(0.0002f * scene_radius_,  -(c[2] - scene_radius_));
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  // Set near plane
  near_   = std::max(0.0001f * scene_radius_,  -(c[2] + scene_radius_));

  // measure distance from scene center ( as projection onto the z-Axis )
//   if ( -c[2] < scene_radius_ ) {
//     std::cerr << "Camera in scene radius" << std::endl;
//
//   }
//
//   std::cerr << "-c[2]   : " << -c[2] << std::endl;
//   std::cerr << "radius  : " << scene_radius_ << std::endl;
//   std::cerr << "z-range : " << far_ - near_ << std::endl;
//   std::cerr << "Near    : " << near_ << std::endl;
//   std::cerr << "Far     : " << far_ << std::endl;
//   near_   = std::max(far_ / 256.0f,  -(c[2] + scene_radius_));

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  updateProjectionMatrix();

  // store time since last repaint in gl state and restart timer
  glstate_->set_msSinceLastRedraw (redrawTime_.restart ());

  // draw mono or stereo
  makeCurrent();
  if (stereo_) drawScene_stereo();
  else         drawScene_mono();

  glFinish();
  frame_time_ = timer.elapsed();
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}


//-----------------------------------------------------------------------------


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void glViewer::drawScene_mono()
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{
  if (sceneGraphRoot_)
  {
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    if (! properties_.renderPicking() ) {
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      ViewObjectMarker *oM = properties_.objectMarker();
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      GLuint refBits = 0;
      QSet<GLuint> references;

      if (oM)
      {
        glClear (GL_STENCIL_BUFFER_BIT);
        glEnable (GL_STENCIL_TEST);
        glStencilOp (GL_KEEP, GL_KEEP, GL_ZERO);
        glStencilFunc (GL_ALWAYS, 0, ~0);

        for (PluginFunctions::ObjectIterator o_it(PluginFunctions::ALL_OBJECTS, DATA_ALL) ;
                                             o_it != PluginFunctions::objectsEnd(); ++o_it)
        {
          bool ok;
          GLuint ref;

          ok = oM->stencilRefForObject(*o_it, ref);

          if (ok)
          {
            o_it->stencilRefNode ()->setReference (ref);
            o_it->stencilRefNode ()->show ();
            refBits |= ref;
            references << ref;
          }
          else
            o_it->stencilRefNode ()->hide ();
        }
      }

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      ACG::SceneGraph::DrawAction action( properties_.drawMode(), *glstate_ , false);
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      ACG::SceneGraph::traverse_multipass(sceneGraphRoot_, action, *glstate_, properties_.drawMode() );
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      if( blending_ )
      {
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        ACG::SceneGraph::DrawAction action(properties_.drawMode(), *glstate_, true);
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        ACG::SceneGraph::traverse_multipass(sceneGraphRoot_, action, *glstate_, properties_.drawMode());
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      }
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      if (oM)
      {
        if (oM->type() == ViewObjectMarker::PerBit)
        {
          references.clear ();
          for (unsigned int i = 0; i < sizeof (GLuint) * 8; i++)
            if (refBits & (1 << i))
              references << (1 << i);
        }

        glPushAttrib(GL_ALL_ATTRIB_BITS);

        glEnable(GL_BLEND);
        glDisable(GL_DEPTH_TEST);
        glDisable(GL_LIGHTING);
        glDisable(GL_DITHER);

        int vp_l, vp_b, vp_w, vp_h;
        glstate_->get_viewport (vp_l, vp_b, vp_w, vp_h);

        glMatrixMode(GL_PROJECTION);
        glPushMatrix ();
        glLoadIdentity();
        glOrtho(0, vp_w, vp_h, 0, 0, 1.0);
        glMatrixMode(GL_MODELVIEW);
        glPushMatrix ();
        glLoadIdentity();

        glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);

        foreach (unsigned int ref, references)
        {
          bool ok;
          GLenum sfactor;
          GLenum dfactor;
          ACG::Vec4f color;
          unsigned int mask = ~0;

          if (oM->type() == ViewObjectMarker::PerBit)
          {
            ok = oM->blendForStencilRefBit (ref, sfactor, dfactor, color);
            mask = ref;
          }
          else
            ok = oM->blendForStencilRefNumber (ref, sfactor, dfactor, color);

          if (!ok)
            continue;

          glStencilFunc (GL_EQUAL, ref, mask);

          glBlendFunc (sfactor, dfactor);
          glColor4f (color[0], color [1], color [2], color[3]);

          glBegin (GL_QUADS);
          glVertex2i(0, 0);
          glVertex2i(0, vp_h);
          glVertex2i(vp_w, vp_h);
          glVertex2i(vp_w, 0);
          glEnd ();

        }

        glMatrixMode(GL_PROJECTION);
        glPopMatrix ();
        glMatrixMode(GL_MODELVIEW);
        glPopMatrix ();

        glPopAttrib ();
        glDisable (GL_STENCIL_TEST);
      }
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    } else {

      // prepare GL state
      makeCurrent();

      glDisable(GL_LIGHTING);
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      glDisable(GL_BLEND);
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      glClear(GL_DEPTH_BUFFER_BIT);
      glInitNames();
      glPushName((GLuint) 0);

      // do the picking
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      glstate_->pick_init (true);
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      ACG::SceneGraph::PickAction action(*glstate_, properties_.renderPickingMode(), properties_.drawMode());
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      ACG::SceneGraph::traverse_multipass(sceneGraphRoot_, action,*glstate_);
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      glEnable(GL_LIGHTING);
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      glEnable(GL_BLEND);
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    }
  }
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  if (cursorPainter_ && cursorPainter_->enabled () && cursorPositionValid_)
  {
    glstate_->push_modelview_matrix ();
    // reset view transformation
    glstate_->reset_modelview ();
    // translate cursor position to 0,0
    glstate_->translate (cursorPoint3D_[0], cursorPoint3D_[1], cursorPoint3D_[2]);
    // paint cursor
    cursorPainter_->paintCursor (glstate_);
    glstate_->pop_modelview_matrix ();
  }
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}


//-----------------------------------------------------------------------------


void
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glViewer::drawScene_stereo()
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{
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  if (OpenFlipper::Options::stereoMode () == OpenFlipper::Options::OpenGL && OpenFlipper::Options::glStereo ())
  {
    drawScene_glStereo ();
    return;
  }
  else if (OpenFlipper::Options::stereoMode () == OpenFlipper::Options::AnaglyphCustom && customAnaglyphSupported_)
  {
    drawScene_customAnaglyphStereo ();

    // if somthing went wrong, fallback to normal anaglyph
    if (customAnaglyphSupported_)
      return;
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  } else if (OpenFlipper::Options::stereoMode () == OpenFlipper::Options::Philips )
  {
    drawScenePhilipsStereo ();
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    return;
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  }
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  drawScene_anaglyphStereo ();
}
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//-----------------------------------------------------------------------------


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void glViewer::setHome()
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{
  home_modelview_          = glstate_->modelview();
  home_inverse_modelview_  = glstate_->inverse_modelview();
  homeOrthoWidth_          = orthoWidth_;
  home_center_             = trackball_center_;
  home_radius_             = trackball_radius_;
}


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void glViewer::home()
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{
  makeCurrent();
  glstate_->set_modelview(home_modelview_, home_inverse_modelview_);
  orthoWidth_ = homeOrthoWidth_;
  trackball_center_ = home_center_;
  trackball_radius_ = home_radius_;
  updateProjectionMatrix();
  updateGL();
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  emit viewChanged();
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}


//-----------------------------------------------------------------------------


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void glViewer::viewAll()
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{
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	makeCurrent();
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	// update scene graph (get new bounding box and set projection right, including near and far plane)
	properties_.lockUpdate();
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	// move center (in camera coords) to origin and translate in -z dir
	translate(-(glstate_->modelview().transform_point(scene_center_))
			- ACG::Vec3d(0.0, 0.0, 3.0 * scene_radius_));

	orthoWidth_ = 1.1 * scene_radius_;
	double aspect = (double) glWidth() / (double) glHeight();
	if (aspect > 1.0)
		orthoWidth_ *= aspect;

	sceneGraph(PluginFunctions::getSceneGraphRootNode(), true);

	properties_.unLockUpdate();
	updateProjectionMatrix();
	updateGL();
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    emit viewChanged();
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}


//-----------------------------------------------------------------------------


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void glViewer::flyTo(const QPoint& _pos, bool _move_back)
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{
  makeCurrent();

  unsigned int nodeIdx, targetIdx;
  ACG::Vec3d hitPoint;

  if (pick( ACG::SceneGraph::PICK_ANYTHING, _pos, nodeIdx, targetIdx, &hitPoint))
  {
    if (projectionMode_ == PERSPECTIVE_PROJECTION)
    {
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      ACG::Vec3d eye(glstate_->eye());
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      ACG::Vec3d t = hitPoint - eye;
      ACG::Vec3d e = eye + t * (_move_back ? -0.5f : 0.5f);
      flyTo(e, hitPoint, 300);
    }
    else
    {
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      // Project hitpoint to get depth
      ACG::Vec3d hitPointProjected = glstate_->project(hitPoint);

      // Create projected center point with same depth as hitpoint
      ACG::Vec3d centerPointProjected = hitPointProjected;
      centerPointProjected[0] = glstate_->viewport_width() / 2.0 ;
      centerPointProjected[1] = glstate_->viewport_height() / 2.0 ;

      // unproject center point
      ACG::Vec3d centerPointUnProjected = glstate_->unproject(centerPointProjected);
      
      // translation vector to make hitpoint project to center point (both need same depth)
      ACG::Vec3d t = hitPoint - centerPointUnProjected;

      // Transform to correct translation vector with modelview.
      t = glstate_->modelview().transform_vector(t);
      
      // originalWidth 
      double orthoWidthOriginal = orthoWidth_;
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      // Set the double click point as the new trackball center
      // Rotations will use this point as the center.
      trackball_center_ = hitPoint;
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      // how many frames in _time ms ?
      unsigned int  frames = (unsigned int)(300 / frame_time_);
      if (frames > 1000) frames=1000;
      
      // animate it
      if (frames > 10)
      {
        
        for (unsigned int i=1; i<frames; ++i)
        {
          // zoom back one frame 
          if ( _move_back ) {
            // Move back by factor 2
            orthoWidth_ = orthoWidthOriginal * (1.0 + 1.0 / (double)frames * i );
          } else
            // Move forward with factor 0.5
            orthoWidth_ = orthoWidthOriginal * (1.0 - 0.5 / (double)frames * i );
          
          // apply translation
          translate(t * (- 1.0 / (double)frames  ) );
          
          update();
          qApp->processEvents();
        }
        updatePickCache_ = true;
      } else {
        
        // direct translation
        translate(-t);
        
        // set the zoom factor when no animation is performed
        orthoWidth_ *= _move_back ? 2.0 : -0.5;
        
      }
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      // Update the projection matrix
      updateProjectionMatrix();

      // Redraw scene
      updateGL();
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      emit viewChanged();
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    }

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  }
}


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void glViewer::flyTo(const ACG::Vec3d&  _position,
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			 const ACG::Vec3d&  _center,
			 double        _time)
{
  makeCurrent();

  // compute rotation
  ACG::Vec3d c = glstate_->modelview().transform_point(_center);
  ACG::Vec3d p = glstate_->modelview().transform_point(_position);
  ACG::Vec3d view =(p-c).normalize();
  ACG::Vec3d z(0,0,1);
  ACG::Vec3d axis = (z % -view).normalize();
  double angle = acos(std::max(-1.0,
			      std::min(1.0,
				       (z | view)))) / M_PI * 180.0;

  if (angle > 175)
    axis  = ACG::Vec3d(0,1,0);


  // compute translation
  ACG::Vec3d target = glstate_->modelview().transform_point(_center);
  ACG::Vec3d trans ( -target[0],
		-target[1],
		-target[2] - (_position-_center).norm() );



  // how many frames in _time ms ?
  unsigned int  frames = (unsigned int)(_time / frame_time_);
  if (frames > 1000) frames=1000;




  // animate it
  if (frames > 10)
  {
    ACG::Vec3d t = trans / (double)frames;
    double a = angle / (double)frames;

    for (unsigned int i=0; i<frames; ++i)
    {
      translate(t);
      if (fabs(a) > FLT_MIN)
	     rotate(axis, a, _center);

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      update();
      qApp->processEvents();
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    }
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    updatePickCache_ = true;
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  }


  // no animation
  else
  {
    translate(trans);
    if (fabs(angle) > FLT_MIN)
      rotate(axis, angle, _center);

    updateGL();
  }


  trackball_center_ = _center;
  trackball_radius_ = std::max(scene_radius_,
			       (_center-_position).norm()*0.9f);
}


//-----------------------------------------------------------------------------


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void glViewer::setView(const ACG::GLMatrixd& _modelview,
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			                  const ACG::GLMatrixd& _inverse_modelview)
{
  makeCurrent();
  glstate_->set_modelview(_modelview, _inverse_modelview);
  updateGL();
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  emit viewChanged();
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}


//-----------------------------------------------------------------------------


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void glViewer::initializeGL()
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{

  // lock update
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  properties_.lockUpdate();
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  // init GL state
  glstate_->initialize();

  // OpenGL state
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_LIGHTING);
  glDisable(GL_DITHER);
  glShadeModel( GL_FLAT );


  projectionMode(   projectionMode_   );
  normalsMode(      normalsMode_      );

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  // Update all settings which