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/*===========================================================================*\
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*                                                                            *
*                              OpenFlipper                                   *
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*      Copyright (C) 2001-2014 by Computer Graphics Group, RWTH Aachen       *
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*                           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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//=============================================================================
//
//  Plugin Functions
//
//=============================================================================

#include <OpenFlipper/common/Types.hh>
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#include <OpenFlipper/common/GlobalOptions.hh>
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//#include <QGLWidget>
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#include <../ObjectTypes/TriangleMesh/TriangleMesh.hh>
#include <../ObjectTypes/PolyMesh/PolyMesh.hh>

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#include "PluginFunctions.hh"
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#include "PluginFunctionsCore.hh"
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namespace PluginFunctions {

 /** \brief DONT USE DIRECTLY!!
  *
  * This Pointer will be used to access the data trees root in the plugin. Never use it directly as
 *  the internal Structure will change. Use the Access functions instead */
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static BaseObject* objectRoot_ = 0;
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/** \brief DONT USE DIRECTLY!!
 *
 * This pointer is internally used to acces the examiner widget in the main apllication
 */
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static std::vector< glViewer* > examiner_widgets_;
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/** \brief DONT USE DIRECTLY!!
 *
 * This vector is used internally to access properties of all viewers
 */
static std::vector< Viewer::ViewerProperties* > viewerProperties_;

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/// TODO : Remove this variable and implement multiView correctly here
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static glViewer*  examiner_widget_;
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/// Contains the currently active examiner
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static unsigned int activeExaminer_ = 0;
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static bool internalLightHandling_ = true;

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/** \brief DONT USE DIRECTLY!!
 *
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 * The pointer to the beginning of the scenegraph nodes ( only the nodes belonging to objects )
 * Between the actual root node ( sceneGraphRootNode_ ) and this node global nodes could be added
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 * This pointer is internally used to access the scenegraphs root node
 */
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static SeparatorNode* dataRootNode_ = 0;

/** This node is used to add nodes between the root node of the scenegraph and the objects separator node.
* It is directly below the sceneGraphRootNode_
*/
static SeparatorNode* dataSeparatorNode_ = 0;
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/** \brief Scenegraph global nodes root
 */
static SeparatorNode* sceneGraphRootNodeGlobal_ = 0;

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/** \brief Scenegraph root node
 */
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static SeparatorNode* sceneGraphRootNode_ = 0;
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/** \brief a dummy properties object returned as a reference if the real object does not exist
 *
 */
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static Viewer::ViewerProperties dummyProperties(-1);
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/** \brief DONT USE DIRECTLY!!
 *
 * This pointer is used internally
 */
static ViewObjectMarker* defaultMarker_ = 0;

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/** \brief DONT USE DIRECTLY!!
 *
 * This pointer is used internally
 */
static QGLWidget* shareGLWidget_ = 0;

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/** This is a unique id for the running OpenFlipper instance. Use it to identify yourself on the network
*/
static int viewerId_ = 0;

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/// Number of currently open objects
static int objectCounter_ = 0;

/// Number of current target objects
static int targetCounter_ = 0;

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/// Map that holds the object handles
static std::map<int, BaseObject*> objectMap_;

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/// Map of scenegraph widget generators
QMap< std::string ,ACG::QtWidgets::SceneGraphWidgetGenerator* > sceneGraphGenerators_;

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void setDataRoot( BaseObject* _root ) {
   objectRoot_ = _root;
}

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int viewers( ) {
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  return examiner_widgets_.size();
}

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void disableExaminerLightHandling() {
  internalLightHandling_ = false;  
}

bool examinerLightHandling() {
  return internalLightHandling_;  
}

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int viewerId() {
  return viewerId_;
}

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void setViewers( std::vector< glViewer* > _viewerWidgets ) {
   PluginFunctions::examiner_widgets_ = _viewerWidgets;
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   PluginFunctions::examiner_widget_ =  examiner_widgets_[0];
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   // Generate a (hopefully) unique viewer id
   QTime time = QTime::currentTime();
   qsrand( time.hour() * 10 + time.minute() * 100 + time.second() * 1000 + time.msec() * 10000  );
   viewerId_ = qrand();
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}

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void setViewerProperties( std::vector< Viewer::ViewerProperties* > _viewerProperties ) {
   PluginFunctions::viewerProperties_ = _viewerProperties;
}

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void setActiveExaminer( const unsigned int _id ) {
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  activeExaminer_ = _id;
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}

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glViewer* viewer(int  _viewerId ) {
   if ( _viewerId < 0 || _viewerId >= (int)examiner_widgets_.size() ) {
     std::cerr << "Requested unknown viewer with id : " << _viewerId << std::endl;
     return examiner_widgets_[activeExaminer()];
   }

   return( examiner_widgets_[_viewerId] );
}

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unsigned int activeExaminer( ) {
  return activeExaminer_;
}

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QString getEncodedExaminerView() {
  return getEncodedExaminerView(activeExaminer());
}

/// Get the encoded view for the given
QString getEncodedExaminerView(int _viewerId) {
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  QString view;
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  if ( _viewerId < 0 || _viewerId >= (int)examiner_widgets_.size() ) {
     std::cerr << "Requested unknown viewer with id : " << _viewerId << std::endl;
     examiner_widgets_[activeExaminer()]->encodeView ( view );
     return view;
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  }

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  examiner_widgets_[_viewerId]->encodeView ( view );
  return view;
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}

void setEncodedExaminerView( QString _view ) {
  setEncodedExaminerView( activeExaminer() , _view );
}

void setEncodedExaminerView(int _viewerId , QString _view ) {
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  if ( _viewerId < 0 || _viewerId >= (int)examiner_widgets_.size() ) {
     std::cerr << "Requested unknown viewer with id : " << _viewerId << std::endl;
     examiner_widgets_[activeExaminer()]->decodeView ( _view );
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  }

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  examiner_widgets_[_viewerId]->decodeView ( _view );
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}

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void setDataSeparatorNodes( SeparatorNode* _dataSeparatorNode ) {
  
  // The function should only be called once by the core. 
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  // Set the separatorNode
  PluginFunctions::dataSeparatorNode_ = _dataSeparatorNode;

  
  if ( PluginFunctions::dataSeparatorNode_->nChildren() != 1 ){
    std::cerr << "Only one child allowed for dataSeparatorNode on initialization!" << std::endl;
    std::cerr << "The Core has initialized the scenegraph in a strange way!" << std::endl;
  }
  
  // Set the root node for the data objects
  // which has to be a child of the dataSeparatorNode_
  PluginFunctions::dataRootNode_ = dynamic_cast<ACG::SceneGraph::SeparatorNode*> (*(PluginFunctions::dataSeparatorNode_->childrenBegin()) );
  
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}

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void setSceneGraphRootNode( SeparatorNode* _root_node ) {
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   PluginFunctions::sceneGraphRootNode_ = _root_node;
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}

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void setSceneGraphRootNodeGlobal( SeparatorNode* _root_node ) {
   PluginFunctions::sceneGraphRootNodeGlobal_ = _root_node;
}

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bool getPickedObject(const unsigned int _node_idx , BaseObjectData*& _object) {
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  for ( ObjectIterator o_it(PluginFunctions::ALL_OBJECTS) ; o_it != PluginFunctions::objectsEnd(); ++o_it) {
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    if ( o_it->picked( _node_idx ) ) {
      _object = *o_it;
      return true;
    }
  }
  return false;
}


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bool getSourceIdentifiers( std::vector<int>& _identifiers  ) {
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  _identifiers.clear();

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  for ( ObjectIterator o_it(PluginFunctions::ALL_OBJECTS) ; o_it != PluginFunctions::objectsEnd(); ++o_it) {
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    if ( o_it->source() )
      _identifiers.push_back ( o_it->id() );
  }
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  return ( ! _identifiers.empty() );
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}

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bool getTargetIdentifiers( std::vector<int>& _identifiers  ) {
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  _identifiers.clear();

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  for ( ObjectIterator o_it(PluginFunctions::ALL_OBJECTS) ; o_it != PluginFunctions::objectsEnd(); ++o_it) {
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    if ( o_it->target() )
      _identifiers.push_back ( o_it->id() );
  }
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  return ( !_identifiers.empty() );
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}

// ===============================================================================
// Get objects
// ===============================================================================

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bool getObject(  const int _identifier , BaseObject*& _object ) {
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  if ( _identifier == -1 )
    return false;
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  // Obsolete:
  //_object = objectRoot_->childExists( _identifier );
  
  // Search for specified object in object map:
  std::map<int, BaseObject*>::iterator it;
  it = objectMap_.find(_identifier);
  // Get object
  _object = (it != objectMap_.end() ? it->second : 0);
  
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  return ( _object != 0 );
}

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bool getObject(  const int _identifier , BaseObjectData*& _object ) {
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  if ( _identifier == -1 )
    return false;
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  // Obsolete: BaseObject* object = objectRoot_->childExists( _identifier );
  
  // Search for specified object in object map:
  std::map<int, BaseObject*>::iterator it;
  it = objectMap_.find(_identifier);
  // Get object
  BaseObject* object = (it != objectMap_.end() ? it->second : 0);
  
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  _object = dynamic_cast< BaseObjectData* >(object);
  return ( _object != 0 );
}

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int getObjectId( const QString& _name ) {
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  if(_name.isEmpty()) return -1;
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  BaseObject* object = objectRoot_->childExists( _name );
  return object ? object->id() : -1;
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}

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// ===============================================================================
// ===============================================================================

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bool objectExists(  const int _identifier ) {
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  if ( _identifier == -1 )
    return false;
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  BaseObject* object = objectRoot_->childExists( _identifier );
  return ( object != 0 );
}

//===============================================================================

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bool getAllMeshes( std::vector<int>& _identifiers  ) {
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  _identifiers.clear();

  // find changed manipulator
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  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::ALL_OBJECTS,typeId("TriangleMesh")) ;
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                                        o_it != PluginFunctions::objectsEnd(); ++o_it)  {
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    _identifiers.push_back( o_it->id() );
  }

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  return (!_identifiers.empty());
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}

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bool getAllObjectIdentifiers( std::vector<int>& _identifiers  ) {
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  _identifiers.clear();

  // find changed manipulator
  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::ALL_OBJECTS) ;
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                                        o_it != PluginFunctions::objectsEnd(); ++o_it)  {
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    _identifiers.push_back( o_it->id() );
  }

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  return ( !_identifiers.empty() );
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}

void setBackColor( OpenMesh::Vec4f _color) {
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  for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
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    PluginFunctions::viewerProperties(i).backgroundColor(_color);
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}

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void setFixedView(int _mode, int _viewer ) {

  if ( (_viewer != ACTIVE_VIEWER ) && ( ( _viewer < 0 ) || _viewer >= (int)examiner_widgets_.size()) ){
    std::cerr << "Unable to set fixed view. Wrong viewer id (" << _viewer << ")" << std::endl;
    return;
  }

  switch ( _mode ){
    case VIEW_TOP : //TOP
      PluginFunctions::viewingDirection( ACG::Vec3d(0.0, -1.0, 0.0), ACG::Vec3d(0.0, 0.0, -1.0), _viewer );
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      PluginFunctions::allowRotation(!PluginFunctions::viewerProperties().rotationLocked(), _viewer);
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      break;
    case VIEW_BOTTOM : //BOTTOM
      PluginFunctions::viewingDirection( ACG::Vec3d(0.0, 1.0, 0.0), ACG::Vec3d(0.0, 0.0, -1.0), _viewer );
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      PluginFunctions::allowRotation(!PluginFunctions::viewerProperties().rotationLocked(), _viewer);
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      break;
    case VIEW_LEFT : //LEFT
      PluginFunctions::viewingDirection( ACG::Vec3d(1.0, 0.0, 0.0), ACG::Vec3d(0.0, 1.0, 0.0), _viewer );
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      PluginFunctions::allowRotation(!PluginFunctions::viewerProperties().rotationLocked(), _viewer);
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      break;
    case VIEW_RIGHT : //RIGHT
      PluginFunctions::viewingDirection( ACG::Vec3d(-1.0, 0.0, 0.0), ACG::Vec3d(0.0, 1.0, 0.0), _viewer );
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      PluginFunctions::allowRotation(!PluginFunctions::viewerProperties().rotationLocked(), _viewer);
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      break;
    case VIEW_FRONT : //FRONT
      PluginFunctions::viewingDirection( ACG::Vec3d(0.0, 0.0, -1.0), ACG::Vec3d(0.0, 1.0, 0.0), _viewer );
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      PluginFunctions::allowRotation(!PluginFunctions::viewerProperties().rotationLocked(), _viewer);
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      break;
    case VIEW_BACK : //BACK
      PluginFunctions::viewingDirection( ACG::Vec3d(0.0, 0.0, 1.0), ACG::Vec3d(0.0, 1.0, 0.0), _viewer );
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      PluginFunctions::allowRotation(!PluginFunctions::viewerProperties().rotationLocked(), _viewer);
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      break;
    default : //Free View
      PluginFunctions::allowRotation(true, _viewer);
      break;
  }

  if ( _viewer == ACTIVE_VIEWER )
    viewerProperties(activeExaminer()).currentViewingDirection( _mode );
  else
    viewerProperties( _viewer ).currentViewingDirection( _mode );
}

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QPoint mapToGlobal(const QPoint _point ) {
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  return examiner_widgets_[activeExaminer_]->glMapToGlobal(_point);
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}

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QPoint mapToLocal( const QPoint _point ) {
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  return examiner_widgets_[activeExaminer_]->glMapFromGlobal(_point);
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}

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void setDrawMode( const ACG::SceneGraph::DrawModes::DrawMode& _mode , int _viewer) {
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  if ( _viewer == ACTIVE_VIEWER )
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    viewerProperties(activeExaminer()).drawMode(_mode);
  else if ( _viewer == ALL_VIEWERS )
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    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
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      viewerProperties(i).drawMode(_mode);
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  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
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    viewerProperties(_viewer).drawMode(_mode);
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  else
    std::cerr << "Requested illegal viewer for setting DrawMode!!" << std::endl;

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}

/** Get the current draw Mode of the examiner widget.\n
 *
 * The DrawModes are defined at ACG/Scenegraph/DrawModes.hh \n
 * They can be combined.
 */
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ACG::SceneGraph::DrawModes::DrawMode drawMode( int _viewer ) {
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  if ( _viewer == ACTIVE_VIEWER ) {
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    return viewerProperties(activeExaminer()).drawMode();
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  } else if ( _viewer == ALL_VIEWERS )
    std::cerr << "Please select viewer to get viewing direction!" << std::endl;
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
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    return viewerProperties(_viewer).drawMode();
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  else
    std::cerr << "Requested illegal viewer for viewingDirection!!" << std::endl;
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  return viewerProperties(activeExaminer()).drawMode();
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}

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// Pick returning node index
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bool scenegraphPick( ACG::SceneGraph::PickTarget _pickTarget, const QPoint &_mousePos, unsigned int &_nodeIdx, unsigned int &_targetIdx, ACG::Vec3d *_hitPointPtr=0 ) {
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   return examiner_widgets_[activeExaminer_]->pick( _pickTarget,_mousePos,_nodeIdx,_targetIdx,_hitPointPtr );
}

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// Pick returning node index
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bool scenegraphPick( const unsigned int _examiner, ACG::SceneGraph::PickTarget _pickTarget, const QPoint &_mousePos, unsigned int &_nodeIdx, unsigned int &_targetIdx, ACG::Vec3d *_hitPointPtr=0 ) {
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  if ( _examiner >= examiner_widgets_.size() ) {
    std::cerr << "Wrong examiner id" << std::endl;
    return false;
  }
  return examiner_widgets_[_examiner]->pick( _pickTarget,_mousePos,_nodeIdx,_targetIdx,_hitPointPtr );
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}

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// Pick returning object and calling refine
bool scenegraphPick( const unsigned int          _examiner ,
                     ACG::SceneGraph::PickTarget _pickTarget,
                     const QPoint &              _mousePos,
                     BaseObjectData*&            _object,
                     unsigned int &              _targetIdx,
                     const bool                  _refine,
                     ACG::Vec3d *                _hitPointPtr ) {

  unsigned int nodeIdx = 0;

  bool ok = scenegraphPick(_examiner,_pickTarget,_mousePos,nodeIdx,_targetIdx,_hitPointPtr);

  // If successfully picked and object is found
  if ( ok && PluginFunctions::getPickedObject(nodeIdx, _object) ) {

    if ( _refine && (_hitPointPtr != 0) ) {

      // Map to correct coordinates in OpenGL
      double x = _mousePos.x() - examiner_widgets_[_examiner]->scenePos().x();
      double y = examiner_widgets_[_examiner]->glHeight() - (_mousePos.y() - examiner_widgets_[_examiner]->scenePos().y());

      std::cerr << "x " << x << "   y " << y << std::endl;

      ACG::Vec3d mousePoint3d = examiner_widgets_[_examiner]->unproject( ACG::Vec3d(x,y,-1.0 ) );

      ACG::Vec3d direction = (mousePoint3d - eyePos(_examiner)).normalized();

      *_hitPointPtr = _object->refinePick(_pickTarget,*_hitPointPtr, mousePoint3d , direction ,  _targetIdx );

    }

  }

  return ok;
}

// Pick returning object and calling refine
bool scenegraphPick( ACG::SceneGraph::PickTarget _pickTarget,
                     const QPoint &              _mousePos,
                     BaseObjectData*&            _object,
                     unsigned int &              _targetIdx,
                     const bool                  _refine,
                     ACG::Vec3d *                _hitPointPtr ) {

  return scenegraphPick(activeExaminer_,_pickTarget,_mousePos, _object,_targetIdx,_refine,_hitPointPtr );

}




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bool scenegraphRegionPick( ACG::SceneGraph::PickTarget                _pickTarget,
                           const QRegion&                             _region,
                           QList<QPair<unsigned int, unsigned int> >& _list,
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                           QVector<float>*                            _depths,
                           QVector<ACG::Vec3d>*                       _points)
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{
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  return examiner_widgets_[activeExaminer_]->pick_region( _pickTarget, _region, _list, _depths, _points);
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}

bool scenegraphRegionPick( const unsigned int                         _examiner,
                           ACG::SceneGraph::PickTarget                _pickTarget,
                           const QRegion&                             _region,
                           QList<QPair<unsigned int, unsigned int> >& _list,
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                           QVector<float>*                            _depths,
                           QVector<ACG::Vec3d>*                       _points)
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{
  if ( _examiner >= examiner_widgets_.size() ) {
    std::cerr << "Wrong examiner id" << std::endl;
    return false;
  }
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  return examiner_widgets_[_examiner]->pick_region( _pickTarget, _region, _list, _depths, _points);
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}
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//Warning : Dont use template function as external static pointer for examiner widget is not resolved correctly!!
void traverse( ACG::SceneGraph::MouseEventAction  &_action ) {
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  // Single pass action, as the mouse action will only update the graph.
  // If its changed, it will be set to dirty and an automatic redraw is triggered.
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  ACG::SceneGraph::traverse(sceneGraphRootNode_, _action );
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}

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const std::string pickMode () {
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  // No seperate draw modes available all should have the same so take first
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  return viewerProperties().pickMode();
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}

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void pickMode ( const std::string& _mode) {
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  // switch to default marker
  setViewObjectMarker (defaultViewObjectMarker ());
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  viewerProperties().pickMode(_mode);
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}

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Viewer::ActionMode actionMode() {
   return viewerProperties().actionMode();
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}

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void actionMode ( Viewer::ActionMode _mode) {

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  viewerProperties().actionMode(_mode);
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}

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void shareGLWidget (QGLWidget *_widget)
{
  shareGLWidget_ = _widget;
}

QGLWidget *shareGLWidget ()
{
  return shareGLWidget_;
}

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void getCurrentViewImage(QImage& _image) {
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  viewer( activeExaminer() )->snapshot( _image );
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}

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Viewer::ViewerProperties& viewerProperties(int _id) {
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  if ( _id >= (int)viewerProperties_.size() ) {
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    std::cerr << " Error, requested properties for non-existing Viewer!" << std::endl;
    return dummyProperties;
  }

  if ( _id == -1 )
    _id = activeExaminer_;

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  return ( *viewerProperties_[_id] );
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}

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void perspectiveProjection( int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->perspectiveProjection();
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->perspectiveProjection();
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->perspectiveProjection();
  else
    std::cerr << "Requested illegal viewer for perspectiveProjection()!!" << std::endl;
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}

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void orthographicProjection( int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->orthographicProjection();
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->orthographicProjection();
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->orthographicProjection();
  else
    std::cerr << "Requested illegal viewer for orthographicProjection()!!" << std::endl;
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}

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void setFOVY( double _fovy) {
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  // Set FOVY for all viewers
  for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
    examiner_widgets_[i]->setFOVY(_fovy);
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}

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void allowRotation(bool _mode, int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->allowRotation(_mode);
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->allowRotation(_mode);
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->allowRotation(_mode);
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  else {
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    std::cerr << "Requested illegal viewer for allowRotation!!" << std::endl;
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    return;
  }
  
  if ( _viewer == ACTIVE_VIEWER )
    viewerProperties(activeExaminer()).rotationLocked( !_mode );
  else
    viewerProperties( _viewer ).rotationLocked( !_mode );
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}

bool allowRotation( int _viewer ) {

  if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    return examiner_widgets_[_viewer]->allowRotation();
  else {

    std::cerr << "Requested illegal viewer for isRotationAllowed!!" << std::endl;
    return false;
  }
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}

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void setMainGLContext() {
  examiner_widget_->makeCurrent();
}

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void viewingDirection(const ACG::Vec3d &_dir, const ACG::Vec3d &_up , int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->viewingDirection(_dir,_up);
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->viewingDirection(_dir,_up);
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->viewingDirection(_dir,_up);
  else
    std::cerr << "Requested illegal viewer for viewingDirection!!" << std::endl;
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}

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void lookAt(const ACG::Vec3d& _eye, const ACG::Vec3d& _center, const ACG::Vec3d& _up, int _viewer) {
    
    if ( _viewer == ACTIVE_VIEWER ) {
        examiner_widgets_[activeExaminer_]->lookAt(_eye,_center, _up);
    } else if ( _viewer == ALL_VIEWERS )
        for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
            examiner_widgets_[i]->lookAt(_eye,_center, _up);
        else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
            examiner_widgets_[_viewer]->lookAt(_eye,_center, _up);
        else
            std::cerr << "Requested illegal viewer for viewingDirection!!" << std::endl;
}

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const ACG::Vec3d trackBallCenter( int _viewer ) {
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  if ( _viewer == ACTIVE_VIEWER ) {
    return examiner_widgets_[activeExaminer_]->trackBallCenter();
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      return examiner_widgets_[i]->trackBallCenter(  );
    else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
      return examiner_widgets_[_viewer]->trackBallCenter(  );
    else
      std::cerr << "Requested illegal viewer for setTrackBallCenter!!" << std::endl;
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  return examiner_widgets_[activeExaminer_]->trackBallCenter();
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}

void setTrackBallCenter(const ACG::Vec3d& _center, int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->setTrackBallCenter( _center );
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->setTrackBallCenter( _center );
    else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
      examiner_widgets_[_viewer]->setTrackBallCenter( _center );
    else
      std::cerr << "Requested illegal viewer for setTrackBallCenter!!" << std::endl;
}

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void setScenePos(const ACG::Vec3d& _center,const double _radius, int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->setScenePos( _center, _radius );
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->setScenePos( _center, _radius );
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->setScenePos( _center, _radius );
  else
    std::cerr << "Requested illegal viewer for setScenePos!!" << std::endl;
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}

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void setScenePos(const ACG::Vec3d& _center, int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->setScenePos( _center, examiner_widgets_[activeExaminer_]->scene_radius() );
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->setScenePos( _center, examiner_widgets_[i]->scene_radius() );
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->setScenePos( _center, examiner_widgets_[_viewer]->scene_radius() );
  else
    std::cerr << "Requested illegal viewer for setScenePos!!" << std::endl;
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}

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void setSceneCenter(const ACG::Vec3d& _center, int _viewer) {

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  if (_viewer == ACTIVE_VIEWER) {
    examiner_widgets_[activeExaminer_]->setSceneCenter(_center);
  } else if (_viewer == ALL_VIEWERS) {
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    for (uint i = 0; i < examiner_widgets_.size(); ++i) {
      examiner_widgets_[i]->setSceneCenter(_center);
    }
  } else if ((_viewer >= 0) && _viewer < (int) examiner_widgets_.size()) {
    examiner_widgets_[_viewer]->setSceneCenter(_center);
  } else {
    std::cerr << "Requested illegal viewer for setSceneCenter!!" << std::endl;
  }
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}

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const ACG::Vec3d sceneCenter(int _viewer) {
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  if (_viewer == ACTIVE_VIEWER) {
    return examiner_widgets_[activeExaminer_]->scene_center();
  } else if (_viewer == ALL_VIEWERS)
    std::cerr << "Please select viewer to get sceneCenter!" << std::endl;
  else if ((_viewer >= 0) && _viewer < (int) examiner_widgets_.size())
    return examiner_widgets_[_viewer]->scene_center();
  else
    std::cerr << "Requested illegal viewer for sceneCenter!!" << std::endl;

  return examiner_widgets_[activeExaminer_]->scene_center();
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}

double sceneRadius() {
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   return examiner_widgets_[activeExaminer_]->scene_radius();
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}

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double sceneRadius( int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    return examiner_widgets_[activeExaminer_]->scene_radius();
  } else if ( _viewer == ALL_VIEWERS )
    std::cerr << "Illegal request for scene radius. Please select one viewer!" << std::endl;
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    return examiner_widgets_[_viewer]->scene_radius();
  else
    std::cerr << "Requested illegal viewer for translate!!" << std::endl;
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  return -1;
}

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void setSceneRadius(double _radius, int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
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    examiner_widgets_[activeExaminer_]->setSceneRadius(_radius);
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  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
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      examiner_widgets_[i]->setSceneRadius(_radius);
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  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
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    examiner_widgets_[_viewer]->setSceneRadius(_radius);
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  else
    std::cerr << "Requested illegal viewer for translate!!" << std::endl;
}

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void translate( const ACG::Vec3d &_vector , int _viewer ) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->translate(_vector);
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->translate(_vector);
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->translate(_vector);
  else
    std::cerr << "Requested illegal viewer for translate!!" << std::endl;
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}

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void rotate(const ACG::Vec3d&  _axis,
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            const double       _angle,
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            const ACG::Vec3d&  _center,
            int                _viewer )
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{
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  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->rotate(_axis,_angle,_center);
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->rotate(_axis,_angle,_center);
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->rotate(_axis,_angle,_center);
  else
    std::cerr << "Requested illegal viewer for rotate!!" << std::endl;
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}

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void viewHome(int _viewer) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->home();
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->home();
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->home();
  else
    std::cerr << "Requested illegal viewer for viewHome!!" << std::endl;
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}

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void viewAll(int _viewer) {
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->viewAll();
  } else if ( _viewer == ALL_VIEWERS )
    for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
      examiner_widgets_[i]->viewAll();
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->viewAll();
  else
    std::cerr << "Requested illegal viewer for viewAll!!" << std::endl;
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}

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ACG::Vec3d viewingDirection(int _viewer) {
  if ( _viewer == ACTIVE_VIEWER ) {
    return viewerProperties(activeExaminer_).glState().viewing_direction();
  } else if ( _viewer == ALL_VIEWERS )
    std::cerr << "Please select viewer to get viewing direction!" << std::endl;
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    return viewerProperties(_viewer).glState().viewing_direction();
  else
    std::cerr << "Requested illegal viewer for viewingDirection!!" << std::endl;

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  return viewerProperties().glState().viewing_direction();
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}

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bool isProjectionOrthographic( int _viewer ) {

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  if ( _viewer == ACTIVE_VIEWER) {
    return (examiner_widgets_[activeExaminer_]->projectionMode() == 0);
  } else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() ){
    return ( examiner_widgets_[_viewer]->projectionMode() == 0); //ORTHOGRAPHIC_PROJECTION ?
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  } else
    std::cerr << "Requested illegal viewer for isProjectionOrthographic!!" << std::endl;

  return false;
}

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ACG::Vec3d eyePos(int _viewer) {
  if ( _viewer == ACTIVE_VIEWER ) {
    return viewerProperties(activeExaminer_).glState().eye();
  } else if ( _viewer == ALL_VIEWERS )
    std::cerr << "Please select viewer to get eyePos!" << std::endl;
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    return viewerProperties(_viewer).glState().eye();
  else
    std::cerr << "Requested illegal viewer for eyePos!!" << std::endl;

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  return viewerProperties().glState().eye();
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}

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ACG::Vec3d upVector(int _viewer) {
  if ( _viewer == ACTIVE_VIEWER ) {
    return viewerProperties(activeExaminer_).glState().up();
  } else if ( _viewer == ALL_VIEWERS )
    std::cerr << "Please select viewer to get up vector!" << std::endl;
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    return viewerProperties(_viewer).glState().up();
  else
    std::cerr << "Requested illegal viewer for up vector!!" << std::endl;

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  return viewerProperties().glState().up();
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}

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/** \brief Get field of view angle
 */
DLLEXPORT
double fovy(int _viewer) {
    if ( _viewer == ACTIVE_VIEWER ) {
      return viewerProperties(activeExaminer_).glState().fovy();
    } else if ( _viewer == ALL_VIEWERS )
      std::cerr << "Please select viewer to get fovy!" << std::endl;
    else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
      return viewerProperties(_viewer).glState().fovy();
    else
      std::cerr << "Requested illegal viewer for fovy!!" << std::endl;

    return viewerProperties().glState().fovy();
}

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void setViewObjectMarker(ViewObjectMarker * _marker)
{
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  for ( uint i = 0 ; i < examiner_widgets_.size(); ++i )
    PluginFunctions::viewerProperties(i).objectMarker(_marker);
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}

void setDefaultViewObjectMarker(ViewObjectMarker * _marker)
{
  defaultMarker_ = _marker;
}

ViewObjectMarker * defaultViewObjectMarker()
{
  return defaultMarker_;
}


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ACG::SceneGraph::BaseNode* getSceneGraphRootNode() {
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   return PluginFunctions::sceneGraphRootNode_;
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}

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ACG::SceneGraph::BaseNode* getRootNode() {
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  return PluginFunctions::dataRootNode_;
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}

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void addGlobalStatusNode(ACG::SceneGraph::BaseNode* _node) {
 if (PluginFunctions::sceneGraphRootNode_){
    
    // get the current parent Node 
    ACG::SceneGraph::BaseNode* parent = sceneGraphRootNodeGlobal_->parent();

    // Move the node to the new parent
    _node->set_parent(parent);
    
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    // move sceneGraphRootNodeGlobal_ to the new parent
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    sceneGraphRootNodeGlobal_->set_parent(_node);
  }
}

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void addGlobalNode(ACG::SceneGraph::BaseNode* _node){
  if (PluginFunctions::sceneGraphRootNode_)
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    _node->set_parent( PluginFunctions::sceneGraphRootNodeGlobal_ );
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}


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void addObjectRenderingNode(ACG::SceneGraph::BaseNode* _node){
  if (PluginFunctions::sceneGraphRootNode_){
    
    // get the current parent Node 
    ACG::SceneGraph::BaseNode* parent = dataRootNode_->parent();

    // Move the node to the new parent
    _node->set_parent(parent);
    
    // move dataRootNode_ to the new parent
    dataRootNode_->set_parent(_node);
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  }
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}

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int objectCount() {
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  return(objectCounter_);
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}



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int targetCount() {
  return ( targetCounter_ );
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}

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int sourceCount() {
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  int count = 0;

  // find changed manipulator
  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::SOURCE_OBJECTS) ;
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                                        o_it != PluginFunctions::objectsEnd(); ++o_it)  {
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    ++count;
  }

  return ( count );
}

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int visibleCount() {
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  int count = 0;

  // find changed manipulator
  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::ALL_OBJECTS) ;
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                                        o_it != PluginFunctions::objectsEnd(); ++o_it)  {
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    if ( o_it->visible() )
    ++count;
  }

  return ( count );

}


/** Returns a vector containing all currently available objects
 *
 * @param _objects vector of all objects
 */
void get_all_objects( std::vector < BaseObjectData*>& _objects ) {

   _objects.clear();

  // find changed manipulator
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  for ( PluginFunctions::ObjectIterator o_it(PluginFunctions::ALL_OBJECTS,DATA_ALL) ;
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                                        o_it != PluginFunctions::objectsEnd(); ++o_it)  {
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    _objects.push_back( *o_it );
  }

}

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/// Fly to point and viewing direction (animated).
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void flyTo (const ACG::Vec3d &_position, const ACG::Vec3d &_center, double _time) {
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   examiner_widgets_[activeExaminer_]->flyTo(_position,_center,_time);
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}

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/// Fly to point and keep viewing direction (animated).
void flyTo (const ACG::Vec3d &_center, bool _move_back, double _time) {
  ACG::Vec3d eye = PluginFunctions::viewerProperties().glState().eye();
  ACG::Vec3d t = _center - eye;
  ACG::Vec3d e = eye + t * (_move_back ? -0.5f : 0.5f);
  examiner_widgets_[activeExaminer_]->flyTo(e, _center, _time);
}


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/// Take a snapshot of a viewer
void viewerSnapshot(int _viewer, QImage& _image, int _width, int _height, bool _alpha,
                    bool _hideCoordsys, int _samples) {
    
  if ( _viewer == ACTIVE_VIEWER ) {
    examiner_widgets_[activeExaminer_]->snapshot(_image, _width, _height, _alpha, _hideCoordsys, _samples);
  } else if ( _viewer == ALL_VIEWERS )
    std::cerr << "Please select viewer to get snapshot!" << std::endl;
  else if ( ( _viewer >= 0 ) && _viewer < (int)examiner_widgets_.size() )
    examiner_widgets_[_viewer]->snapshot(_image, _width, _height, _alpha, _hideCoordsys, _samples);
  else
    std::cerr << "Requested illegal viewer for snapshot!!" << std::endl;
}

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// ===============================================================================
// Getting data from objects and casting between them
// ===============================================================================

BaseObjectData* baseObjectData( BaseObject* _object ){
  if ( _object == 0 )
    return 0;
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  return dynamic_cast< BaseObjectData* >(_object);
}

// ===============================================================================
// Get the root of the object structure
// ===============================================================================
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BaseObject*& objectRoot() {
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  return (objectRoot_);
}

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void increaseObjectCount() {
  objectCounter_++;
}

// Increase the number of current Object
void decreaseObjectCount() {
  objectCounter_--;
  
  if ( objectCounter_ < 0 )
    std::cerr << "Deleted more objects than created!!!" << std::endl;
}

void increaseTargetCount() {
  targetCounter_++;
}

// Increase the number of current Object
void decreaseTargetCount() {
  targetCounter_--;
  
  if ( targetCounter_ < 0 )
    std::cerr << "target object counter underflow!!!" << std::endl;
}

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// ===============================================================================
// Add an object to the internal object map
// ===============================================================================
void addObjectToMap(int _objectId, BaseObject* _object) {
    
    // Look if object's id already exists in map
    std::map<int, BaseObject*>::iterator it;
    it = objectMap_.find(_objectId);
    // If so return
    if(it != objectMap_.end()) return;
    
    // Add new object to map
    objectMap_.insert(std::pair<int, BaseObject*>(_objectId, _object));
}

// ===============================================================================
// Remove an object from the internal object map
// ===============================================================================
void removeObjectFromMap(int _objectId) {
    
    // Look if object exists in map
    std::map<int, BaseObject*>::iterator it;
    it = objectMap_.find(_objectId);
    
    // Erase entry
    if(it != objectMap_.end()) objectMap_.erase(it);
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}
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void addSceneGraphGenerator(ACG::QtWidgets::SceneGraphWidgetGenerator* _generator) {
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   // Check if we already have a generator for this type.
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  if ( sceneGraphGenerators_.contains( _generator->handles() ) ) 
    return;
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  // Store the generator
  sceneGraphGenerators_[_generator->handles() ] = _generator;
}


QMap< std::string ,ACG::QtWidgets::SceneGraphWidgetGenerator* > getSceneGraphGeneratorList(){
  return sceneGraphGenerators_;
}

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QString getOpenFileName(const QString &configProperty,
                        QWidget * parent, const QString & caption,
                        const QString & defaultDir, const QString & filter,
                        QString * selectedFilter, QFileDialog::Options options) {

    const QString dir = OpenFlipperSettings().value(configProperty, defaultDir).toString();
    const QString result = QFileDialog::getOpenFileName(parent, caption, dir,
                                                        filter, selectedFilter, options);
    if (result.length())
        OpenFlipperSettings().setValue(configProperty, result);
    return result;
}

QString getSaveFileName(const QString &configProperty,
                        QWidget * parent, const QString & caption,
                        const QString & defaultDir, const QString & filter,
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                        QString * selectedFilter, QFileDialog::Options options,
                        const QString & defaultSuffix) {
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    const QString dir = OpenFlipperSettings().value(configProperty, defaultDir).toString();
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    /*
     * We don't use this convenience wrapper any more since it
     * prevents us from setting the default suffix.
     *
     * const QString result = QFileDialog::getSaveFileName(
     *     parent, caption, dir, filter, selectedFilter, options);
     */

    QFileDialog dialog(parent, caption, dir, filter);
    dialog.setOptions(options);
    dialog.setAcceptMode(QFileDialog::AcceptSave);
    if (selectedFilter && !selectedFilter->isEmpty())
        dialog.selectNameFilter(*selectedFilter);
    dialog.setDefaultSuffix(defaultSuffix);
    if (dialog.exec() == QDialog::Accepted) {
        if (selectedFilter)
            *selectedFilter = dialog.selectedNameFilter();
        QString result = dialog.selectedFiles().value(0);
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        OpenFlipperSettings().setValue(configProperty, result);
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        return result;
    }
    return QString();
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}

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QStringList collectObjectComments(bool visibleOnly, bool targetedOnly) {
    QStringList result;
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    for (ObjectIterator o_it(targetedOnly ? TARGET_OBJECTS : ALL_OBJECTS, DATA_ALL) ; o_it != objectsEnd(); ++o_it) {
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        if (visibleOnly && !o_it->visible()) continue;

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        result.append(o_it->getAllCommentsFlat());
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    }
    return result;
}

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QStringList collectObjectMaterials(bool visibleOnly, bool targetedOnly) {
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    if (!ACG::SceneGraph::Material::support_json_serialization())
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        return QStringList();

    QStringList result;
    for (ObjectIterator o_it(targetedOnly ? TARGET_OBJECTS : ALL_OBJECTS, DATA_ALL) ; o_it != objectsEnd(); ++o_it) {

        if (visibleOnly && !o_it->visible()) continue;

        QString materialStr(QObject::tr("<not available>"));
        if (!o_it->materialNode())
            materialStr = QObject::tr("<not available: materialNode == null>");
        else
            materialStr = o_it->materialNode()->material().serializeToJson();

        if (!result.empty())
            result.last().append(QString::fromUtf8(","));
        result.append(QString::fromUtf8("\"%1\": %2").arg(o_it->name()).arg(materialStr));
    }
    return result;
}

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void invalidatePickCaches() {
    for(size_t i = 0; i < examiner_widgets_.size(); ++i) {
        examiner_widgets_[i]->invalidatePickCache();
    }
}

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} // End namespace PluginFunctions