diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/CMakeLists.txt b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/CMakeLists.txt
deleted file mode 100644
index 668f2c2fc19..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/CMakeLists.txt
+++ /dev/null
@@ -1,37 +0,0 @@
-# Created by the script cgal_create_cmake_script
-# This is the CMake script for compiling a CGAL application.
-
-project (Periodic_4_hyperbolic_triangulation_2_demo)
-
-# Find includes in corresponding build directories
-set(CMAKE_INCLUDE_CURRENT_DIR ON)
-
-# Instruct CMake to run moc automatically when needed.
-set(CMAKE_AUTOMOC ON) 
-
-cmake_minimum_required(VERSION 2.8.11)
-if(POLICY CMP0043)
-  cmake_policy(SET CMP0043 OLD)
-endif()
-
-find_package(CGAL COMPONENTS Qt5)
-include(${CGAL_USE_FILE})
-
-find_package(Qt5 QUIET COMPONENTS Widgets)
-
-include_directories (BEFORE ../../../Hyperbolic_triangulation_2/include ../../include include)
-
-# ui files, created with Qt Designer
-qt5_wrap_ui( uis Periodic_4_hyperbolic_triangulation_2.ui )
-
-# qrc files (resources files, that contain icons, at least)
-qt5_add_resources ( RESOURCE_FILES resources/Periodic_4_hyperbolic_triangulation_2.qrc )
-
-
-# cpp files
-
-add_executable ( Periodic_4_hyperbolic_Delaunay_triangulation_2_demo Periodic_4_hyperbolic_Delaunay_triangulation_2_demo.cpp )
-qt5_use_modules( Periodic_4_hyperbolic_Delaunay_triangulation_2_demo Widgets)
-add_to_cached_list( CGAL_EXECUTABLE_TARGETS Periodic_4_hyperbolic_Delaunay_triangulation_2_demo )
-target_link_libraries( Periodic_4_hyperbolic_Delaunay_triangulation_2_demo ${CGAL_LIBRARIES} ${QT_LIBRARIES} ${CGAL_QT_LIBRARIES} )
-
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/Periodic_4_hyperbolic_Delaunay_triangulation_2_demo.cpp b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/Periodic_4_hyperbolic_Delaunay_triangulation_2_demo.cpp
deleted file mode 100644
index a123ab05ae5..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/Periodic_4_hyperbolic_Delaunay_triangulation_2_demo.cpp
+++ /dev/null
@@ -1,859 +0,0 @@
-#include <fstream>
-
-// CGAL headers
-#include <CGAL/Triangulation_vertex_base_with_info_2.h>
-#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
-#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
-#include <CGAL/Periodic_4_hyperbolic_Delaunay_triangulation_2.h> 
-#include <CGAL/Periodic_4_hyperbolic_Delaunay_triangulation_traits_2.h>
-#include <CGAL/point_generators_2.h>
-// unique words
-#include <CGAL/Square_root_2_field.h>
-#include <CGAL/Hyperbolic_octagon_translation_matrix.h>
-#include <CGAL/Hyperbolic_random_points_in_disc_2.h>
-// to be deleted (iiordano: why?)
-#include <CGAL/Qt/HyperbolicPainterOstream.h>
-// for viewportsBbox
-#include <CGAL/Qt/utility.h>
-
-// Qt headers
-#include <QtGui>
-#include <QString>
-#include <QActionGroup>
-#include <QFileDialog>
-#include <QInputDialog>
-#include <QGraphicsEllipseItem>
-
-// for filtering
-#include <set>
-#include <string>
-
-// GraphicsView items and event filters (input classes)
-#include "CGAL/Qt/TriangulationCircumcircle.h"
-#include "CGAL/Qt/TriangulationMovingPoint.h"
-#include "CGAL/Qt/TriangulationConflictZone.h"
-#include "CGAL/Qt/TriangulationRemoveVertex.h"
-#include "CGAL/Qt/TriangulationPointInputAndConflictZone.h"
-#include <CGAL/Qt/VoronoiGraphicsItem.h>
-#include <CGAL/Qt/TriangulationGraphicsItemWithColorInfo.h>     // Visualise color
-#include <CGAL/TranslationInfo.h>                               // Store color
-#include <CGAL/Qt/DemosMainWindow.h>
-
-
-#define INITIAL_RECURSION_DEPTH 4
-
-// dummy points
-#include <CGAL/Periodic_4_hyperbolic_Delaunay_triangulation_dummy.h>
-
-// the two base classes
-#include "ui_Periodic_4_hyperbolic_Delaunay_triangulation_2.h"
-
-
-
-typedef CGAL::Exact_predicates_inexact_constructions_kernel   InR;
-typedef CGAL::Exact_predicates_exact_constructions_kernel     R;
-
-typedef CGAL::Triangulation_hyperbolic_traits_2<R>            THT2;
-typedef CGAL::Periodic_4_hyperbolic_Delaunay_triangulation_traits_2<R> 
-                                                              K;
-typedef K::Point_2                                            Point;
-// keep color
-typedef TranslationInfo<std::string>                          Vb_info;
-typedef CGAL::Triangulation_vertex_base_with_info_2< Vb_info, K > 
-                                                              Vb;
-typedef CGAL::Triangulation_face_base_with_info_2 <CGAL::Hyperbolic_face_info_2, K > 
-                                                              Fb;
-typedef CGAL::Periodic_4_hyperbolic_Delaunay_triangulation_2< K, CGAL::Triangulation_data_structure_2<Vb, Fb> > 
-                                                              Delaunay;
-typedef Delaunay::Vertex_handle                               Vertex_handle;
-typedef K::Side_of_fundamental_octagon                        Side_of_fundamental_octagon;
-
-
-struct PointsComparator {
-  static double eps; 
-  
-  bool operator() (const Point& l, const Point& r) const
-  {
-    if(l.x() < r.x() - eps) {
-      return true;
-    }
-    if(l.x() < r.x() + eps) {
-      if(l.y() < r.y() - eps) {
-        return true;
-      }
-    }
-    return false;
-  }
-};
-
-double PointsComparator::eps = 0.0001;
-
-string glabels[] = { "a", "\\bar{b}", "c", "\\bar{d}", "\\bar{a}", "b", "\\bar{c}", "d" };
-
-
-void recurr(vector<Hyperbolic_octagon_translation_matrix>& v, vector<Hyperbolic_octagon_translation_matrix> g, int depth = 1) {
-  if (depth > 1) {
-    
-    recurr(v, g, depth-1);
-
-    vector<Hyperbolic_octagon_translation_matrix> tmp;
-    vector<string> tmpw;
-    for (int i = 0; i < v.size(); i++) {
-      tmp.push_back(v[i]);
-    }
-
-    for (int i = 0; i < tmp.size(); i++) {
-      for (int j = 0; j < g.size(); j++) {
-        v.push_back(tmp[i]*g[j]);
-      }
-    }
-  } else if (depth == 1) {
-    for (int i = 0; i < g.size(); i++) {
-      v.push_back(g[i]);
-    }
-  } 
-}
-
-
-void my_unique_words(std::vector<Point>& p, Point input, int depth) {
-  std::vector<Hyperbolic_octagon_translation_matrix> g;
-  get_generators(g);
-  std::vector<Hyperbolic_octagon_translation_matrix> v;
-  recurr(v, g, depth);
-  std::set<Hyperbolic_octagon_translation_matrix> s;
-
-  for (int i = 0; i < v.size(); i++) {
-    s.insert( v[i] );
-  }
-
-  //cout << "Original point and images: " << endl;
-  //cout << input.x() << ", " << input.y() << endl;
-  cout << "Translating... " << endl;
-  for (set<Hyperbolic_octagon_translation_matrix>::iterator it = s.begin(); it != s.end(); it++) {
-    Hyperbolic_octagon_translation_matrix m = *it;
-    pair<double, double> res;
-    res = m.apply(to_double(input.x()), to_double(input.y()));
-    //cout << res.first << ", " << res.second << endl;
-    p.push_back( Point(res.first, res.second) );
-  }
-  cout << "Done! Now I need to draw " << p.size() << " points..." << endl;
-
-}
-
-
-
-void apply_unique_words(std::vector<Point>& points, Point input = Point(0, 0), double threshold = 10, int word_length = 6, double d = .998)
-{
-
-  cout << "apply_unique_words called with threshold = " << threshold << ", word_length = " << word_length << ", d = " << d << endl;
-
-  static vector<Hyperbolic_octagon_translation_matrix> unique_words;
-  static bool generated = false;
-  if(generated == false) {
-    generate_unique_words(unique_words, threshold, word_length);
-    generated = true;
-  }
-  
-  //points.resize(unique_words.size());
-  pair<double, double> res;
-  for(size_t i = 0; i < unique_words.size(); i++) {
-    pair<double, double> res;
-    res = unique_words[i].apply(to_double(input.x()), to_double(input.y()));
-
-    double dist = res.first*res.first + res.second*res.second;
-    if(dist < d) {
-      points.push_back( Point(res.first, res.second) );
-    }
-  }
-}
-
-void apply_unique_words_G(std::vector<Point>& points, Point input = Point(0, 0), double threshold = 6/*13.5*/, int word_length = 6/*20*/)
-{
-  static vector<Hyperbolic_octagon_translation_matrix> unique_words;
-  static bool generated = false;
-  if(generated == false) {
-    generate_unique_words(unique_words, threshold, word_length);
-    generated = true;
-    
-    // to generate all words
-    /*
-    ofstream fwords("m_w");
-    fwords << "local words;\nPrint(\"words!\\n\");\nwords := [\n";
-    for(size_t i = 0; i < unique_words.size() - 1; i++) {
-      fwords << unique_words[i].label << "," <<endl;
-    }
-    fwords << unique_words[unique_words.size() - 1].label << endl;
-    fwords << "];\nreturn words;";
-    fwords.close();
-    */
-    //
-  }
-  
-  ifstream findices("indicesG8_1");
-  long index;
-  vector<long> indices;
-  while(findices >> index) {
-    indices.push_back(index);
-  }
-  cout << "indices size " << indices.size() << endl; 
-
-  pair<double, double> res;
-  for(size_t i = 0; i < indices.size(); i++) {
-    pair<double, double> res;
-    if(indices[i] < unique_words.size() /*&& unique_words[indices[i]].length() <  13.*/) {
-      res = unique_words[indices[i]].apply(to_double(input.x()), to_double(input.y()));
-      points.push_back(Point(res.first, res.second));
-    }
-  }
-  cout << "nb of points to insert " << points.size() << endl;
-}
-
-
-class MainWindow :
-  public CGAL::Qt::DemosMainWindow,
-  public Ui::Periodic_4_hyperbolic_Delaunay_triangulation_2
-{
-  Q_OBJECT
-  
-private:  
-
-  int               recursion_depth;
-  int               cidx;
-  std::vector<int>  ccol;
-  bool              dummy_mode;
-
-  Delaunay                                                      dt;
-  QGraphicsEllipseItem                                        * disk;
-  QGraphicsScene                                                scene;  
-
-  CGAL::Qt::TriangulationGraphicsItem<Delaunay>               * dgi;
-  CGAL::Qt::VoronoiGraphicsItem<Delaunay>                     * vgi;
-  
-  // for drawing Voronoi diagram of the orbit of the origin
-  CGAL::Qt::VoronoiGraphicsItem<Delaunay>                     * origin_vgi;
-
-  CGAL::Qt::TriangulationMovingPoint<Delaunay>                * mp;
-  CGAL::Qt::TriangulationConflictZone<Delaunay>               * cz;
-  CGAL::Qt::TriangulationRemoveVertex<Delaunay>               * trv;
-  CGAL::Qt::TriangulationPointInputAndConflictZone<Delaunay>  * pi;
-  CGAL::Qt::TriangulationCircumcircle<Delaunay>               * tcc;
-public:
-  MainWindow();
-
-public slots:
-
-  void processInput(CGAL::Object o);
-
-  void on_actionMovingPoint_toggled(bool checked);
-
-  void on_actionShowConflictZone_toggled(bool checked);
-
-  void on_actionCircumcenter_toggled(bool checked);
-
-  void on_actionShowDelaunay_toggled(bool checked);
-
-  void on_actionShowVoronoi_toggled(bool checked);
-
-  void on_actionInsertPoint_toggled(bool checked);
-  
-  void on_actionInsertRandomPoints_triggered();
-
-  void on_actionInsertPointOnFundamentalSide_triggered();
-  void on_actionInsertPointOnAxis_triggered();
-
-  void on_actionInsertOrigin_triggered();
-
-  void on_actionInsertDummyPoints_triggered();
-
-  void on_actionModifyDepth_triggered();
-
-  void on_actionLoadPoints_triggered();
-
-  void on_actionSavePoints_triggered();
-
-  void on_actionClear_triggered();
-
-  void on_actionRecenter_triggered();
-
-  virtual void open(QString fileName);
-
-signals:
-  void changed();
-};
-
-
-MainWindow::MainWindow()
-  : DemosMainWindow(), dt(K(1))
-{
-  dummy_mode = false;
-  recursion_depth = INITIAL_RECURSION_DEPTH;
-  cidx = 0;
-  for (int i = 0; i < 14; i++)
-    ccol.push_back(i);
-  
-  setupUi(this);
-
-  this->graphicsView->setAcceptDrops(false);
-  
-  // Add Poincaré disk
-  qreal origin_x = 0, origin_y = 0, radius = 1, diameter = 2*radius;
-  qreal left_top_corner_x = origin_x - radius;
-  qreal left_top_corner_y = origin_y - radius;
-  qreal width = diameter, height = diameter;
-  
-  // set background
-  qreal eps = 0.01;
-  QGraphicsRectItem* rect = new QGraphicsRectItem(left_top_corner_x - eps, left_top_corner_y - eps, width + 2*eps, height + 2*eps);
-  rect->setPen(Qt::NoPen);
-  rect->setBrush(Qt::white);
-  scene.addItem(rect);
-  
-  // set disk
-  disk = new QGraphicsEllipseItem(left_top_corner_x, left_top_corner_y, width, height);
-  QPen pen;  // creates a default pen
-  pen.setWidth(0);
-  //pen.setBrush(Qt::black);
-  pen.setBrush(Qt::black);
-  disk->setPen(pen);
-
-  scene.addItem(disk);
-  
-  // another input point, instead of the origin
-  
-  //double phi = CGAL_PI / 8.;
-  //double psi = CGAL_PI / 3.;
-  //double rho = std::sqrt(cos(psi)*cos(psi) - sin(phi)*sin(phi));
-  
-  //Point origin = Point(0, 0);
-  //const Point a(cos(phi)*cos(phi + psi)/rho, sin(phi)*cos(phi + psi)/rho);
-  
-  
-  // dt to form the octagon tessellation
-  //vector<Point> origin_orbit;
-  //apply_unique_words(origin_orbit, origin, 10, 6);
-  //origin_orbit.push_back(Point(0, 0));
-  // for(long i = 0; i < origin_orbit.size(); i++) {
-  //   cout << origin_orbit[i] << endl;
-  // }
-  //cout << "nb of points on the orbit of the origin: " << origin_orbit.size() << endl;
-
-  //Delaunay* dtO = new Delaunay(K(1));
-  //dtO->insert(origin_orbit.begin(), origin_orbit.end());
-  
-  //origin_vgi = new CGAL::Qt::VoronoiGraphicsItem<Delaunay>(dtO);
-  //origin_vgi->setVisible(true);
-  
-  //QObject::connect(this, SIGNAL(changed()),
-  //                 origin_vgi, SLOT(modelChanged()));
-  
-  //QColor br(149, 179, 179);
-  //origin_vgi->setEdgesPen(QPen(br, 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
-  //scene.addItem(origin_vgi);
-  
-  
-  // Add a GraphicItem for the Delaunay triangulation
-  dgi = new CGAL::Qt::TriangulationGraphicsItem<Delaunay>(&dt);
-
-  QObject::connect(this, SIGNAL(changed()),
-		   dgi, SLOT(modelChanged()));
-
-  dgi->setVerticesPen(QPen(Qt::red, 3, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
-  dgi->setEdgesPen(QPen(QColor(200, 200, 0), 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
-  scene.addItem(dgi);
-
-  // Add a GraphicItem for the Voronoi diagram
-  vgi = new CGAL::Qt::VoronoiGraphicsItem<Delaunay>(&dt);
-
-  QObject::connect(this, SIGNAL(changed()),
-		   vgi, SLOT(modelChanged()));
-
-  QColor brown(139, 69, 19);
-  vgi->setEdgesPen(QPen(Qt::blue, 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
-  scene.addItem(vgi);
-  vgi->hide();
-
-  // Setup input handlers. They get events before the scene gets them
-  // and the input they generate is passed to the triangulation with 
-  // the signal/slot mechanism    
-  pi = new CGAL::Qt::TriangulationPointInputAndConflictZone<Delaunay>(&scene, &dt, this );
-
-  QObject::connect(pi, SIGNAL(generate(CGAL::Object)),
-		   this, SLOT(processInput(CGAL::Object)));
-
-  mp = new CGAL::Qt::TriangulationMovingPoint<Delaunay>(&dt, this);
-  // TriangulationMovingPoint<Delaunay> emits a modelChanged() signal each
-  // time the moving point moves.
-  // The following connection is for the purpose of emitting changed().
-  QObject::connect(mp, SIGNAL(modelChanged()),
-		   this, SIGNAL(changed()));
-
-  trv = new CGAL::Qt::TriangulationRemoveVertex<Delaunay>(&dt, this);
-  QObject::connect(trv, SIGNAL(modelChanged()),
-		   this, SIGNAL(changed()));
-
-  tcc = new CGAL::Qt::TriangulationCircumcircle<Delaunay>(&scene, &dt, this);
-  tcc->setPen(QPen(Qt::red, 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
-
-  cz = new CGAL::Qt::TriangulationConflictZone<Delaunay>(&scene, &dt, this);
-
-  // 
-  // Manual handling of actions
-  //
-
-  QObject::connect(this->actionQuit, SIGNAL(triggered()), 
-		   this, SLOT(close()));
-
-  // We put mutually exclusive actions in an QActionGroup
-  QActionGroup* ag = new QActionGroup(this);
-  ag->addAction(this->actionInsertPoint);
-  ag->addAction(this->actionMovingPoint);
-  ag->addAction(this->actionCircumcenter);
-  ag->addAction(this->actionShowConflictZone);
-
-  // Check two actions 
-  this->actionInsertPoint->setChecked(true);
-  this->actionShowDelaunay->setChecked(true);
-
-  // //
-  // // Setup the scene and the view
-  // //
-  scene.setItemIndexMethod(QGraphicsScene::NoIndex);
-  scene.setSceneRect(left_top_corner_x, left_top_corner_y, width, height);
-  this->graphicsView->setScene(&scene);
-  this->graphicsView->setMouseTracking(true);
-  this->graphicsView->shear(230, 230);
-
-  // // The navigation adds zooming and translation functionality to the
-  // // QGraphicsView
-  this->addNavigation(this->graphicsView);
-  this->setupStatusBar();
-  this->setupOptionsMenu();
-  this->addAboutDemo(":/cgal/help/about_Delaunay_triangulation_2.html");
-  this->addAboutCGAL();
-
-  this->addRecentFiles(this->menuFile, this->actionQuit);
-  connect(this, SIGNAL(openRecentFile(QString)),
-	        this, SLOT(open(QString)));
-
-
-}
-
-
-void
-MainWindow::processInput(CGAL::Object o)
-{
-
-  typedef CGAL::Exact_predicates_inexact_constructions_kernel GT;
-  typedef GT::Point_2 Point_2;
-  Point_2 pp;
-  if (CGAL::assign(pp, o)) {
-  	Point tmp(pp.x(), pp.y());
-  	o = make_object(tmp);
-  }
-
-  Point p;
-  if(CGAL::assign(p, o)){
-    QPointF qp(CGAL::to_double(p.x()), CGAL::to_double(p.y()));
-    
-    // Cheat a little to guarantee insertion of dummy points
-    CGAL::Bounded_side side;
-    if (dummy_mode) {
-      side = CGAL::ON_BOUNDED_SIDE;
-    } else {
-      Side_of_fundamental_octagon check = Side_of_fundamental_octagon();
-      side = check(p);
-    }
-
-    // note that if the point is on the boundary then the disk contains the point
-    //if(disk->contains(qp)){
-
-    if(side != CGAL::ON_UNBOUNDED_SIDE) {
-      //dt.insert(p);
-      
-      //delete
-      vector<Point> points;
-      //apply_unique_words(points, p, 4, 1, .998);
-      my_unique_words(points, p, recursion_depth);
-
-      points.push_back(p);
-      Vertex_handle v;
-      for(size_t j = 0; j < points.size() ; j++) {
-        v = dt.insert(points[j]);
-        if (/*!dummy_mode*/ true) {
-          v->info().setColor(ccol[cidx]);
-        } else {
-          v->info().setColor(-1);  // This will default to gray
-        }
-      }
-      if (/*!dummy_mode*/ true) {
-        cidx = (cidx + 1) % ccol.size();
-      }
-      //
-    }
-    // delete
-    /*
-    else {
-      static double phi = CGAL_PI / 8.;
-      static double psi = CGAL_PI / 3.;
-      static double rho = std::sqrt(cos(psi)*cos(psi) - sin(phi)*sin(phi));
-      
-      static Point origin = Point(0, 0);
-      static Point a(cos(phi)*cos(phi + psi)/rho, sin(phi)*cos(phi + psi)/rho);
-      static Point b((cos(psi)-sin(phi))/rho, 0.);
-      
-      static Point current_point_a = origin;
-      static Point current_point_b = origin;
-      static double dT = 0.05;
-      
-      static double dx_a = dT * CGAL::to_double(a.x());
-      static double dy_a = dT * CGAL::to_double(a.y());
-      current_point_a = Point(current_point_a.x() + dx_a, current_point_a.y() + dy_a);
-      if(current_point_a.x() > a.x()) {
-        current_point_a = origin;
-      }
-      
-      static double dx_b = dT * CGAL::to_double(b.x());
-      static double dy_b = dT * CGAL::to_double(b.y());
-      current_point_b = Point(current_point_b.x() + dx_b, current_point_b.y() + dy_b);
-      std::cout << current_point_b.x() << " : " << current_point_b.y() << std::endl;
-      if(current_point_b.x() > b.x()) {
-        current_point_b = origin;
-      }
-      
-      vector<Point> points;
-    
-      // current_point_b <-> current_point_b
-      Point current_point = current_point_a;
-      apply_unique_words(points, current_point);
-      points.push_back(current_point);
-      dt.clear();
-      dt.insert(points.begin(), points.end());
-      
-    } */
-    
-  }
-  emit(changed());
-
-  cout << "v = " << dt.number_of_vertices() << ", f = " << dt.number_of_faces() << endl;
-
-}
-
-
-
-
-
-/* 
- *  Qt Automatic Connections
- *  http://doc.trolltech.com/4.4/designer-using-a-component.html#automatic-connections
- * 
- *  setupUi(this) generates connections to the slots named
- *  "on_<action_name>_<signal_name>"
- */
-void
-MainWindow::on_actionInsertPoint_toggled(bool checked)
-{
-  if(checked){
-    scene.installEventFilter(pi);
-    scene.installEventFilter(trv);
-  } else {
-    scene.removeEventFilter(pi);
-    scene.removeEventFilter(trv);
-  }
-}
-
-
-void
-MainWindow::on_actionMovingPoint_toggled(bool checked)
-{
-
-  if(checked){
-    scene.installEventFilter(mp);
-  } else {
-    scene.removeEventFilter(mp);
-  }
-}
-
-
-void
-MainWindow::on_actionShowConflictZone_toggled(bool checked)
-{
-
-  if(checked){
-    scene.installEventFilter(cz);
-  } else {
-    scene.removeEventFilter(cz);
-  }
-}
-
-void
-MainWindow::on_actionCircumcenter_toggled(bool checked)
-{
-  if(checked){
-    scene.installEventFilter(tcc);
-    tcc->show();
-  } else {  
-    scene.removeEventFilter(tcc);
-    tcc->hide();
-  }
-}
-
-
-void
-MainWindow::on_actionShowDelaunay_toggled(bool checked)
-{
-  dgi->setVisibleEdges(checked);
-}
-
-
-void
-MainWindow::on_actionShowVoronoi_toggled(bool checked)
-{
-  vgi->setVisible(checked);
-}
-
-
-void
-MainWindow::on_actionClear_triggered()
-{
-  dt.clear();
-  emit(changed());
-}
-
-
-void
-MainWindow::on_actionInsertRandomPoints_triggered()
-{
-  bool ok = false;
-  const int number_of_points = 
-    QInputDialog::getInt(this, 
-                        tr("Number of random points"),
-                        tr("Enter number of random points"),
-			     100,
-			     0,
-			     std::numeric_limits<int>::max(),
-			     1,
-			     &ok);
-
-  if(!ok) {
-    return;
-  }
-
-  // wait cursor
-  QApplication::setOverrideCursor(Qt::WaitCursor);
-
-  typedef CGAL::Exact_predicates_inexact_constructions_kernel GT;
-  typedef GT::Point_2 Point_2;
-  typedef GT::FT FT;
-
-  vector<Point_2> pts;
-  Hyperbolic_random_points_in_disc_2<GT>(pts, number_of_points);
-
-  for(int i = 0; i < number_of_points; ++i){
-    processInput(make_object(pts[i]));
-  }
-  QApplication::restoreOverrideCursor();
-  emit(changed());
-}
-
-
-
-void
-MainWindow::on_actionInsertOrigin_triggered()
-{
-
-  std::vector<Point> pts;
-  cout << "Inserting Origin now! " << endl;
-
-  cidx = 0;
-  processInput(make_object(Point(0, 0)));
-
-  cout << "Origin inserted! " << endl;
-  emit(changed());
-
-}
-
-
-void
-MainWindow::on_actionInsertPointOnAxis_triggered()
-{
-
-  std::vector<Point> pts;
-  cout << "Inserting point on axis now! " << endl;
-
-  cidx = 0;
-  processInput(make_object(Point(0, 0.29)));
-
-  cout << "Point on axis inserted! " << endl;
-  emit(changed());
-
-}
-
-void
-MainWindow::on_actionInsertPointOnFundamentalSide_triggered()
-{
-
-  std::vector<Point> pts;
-  cout << "Inserting point on side of fundamental octagon now! " << endl;
-
-  cidx = 0;
-  processInput(make_object(Point(0, sqrt(sqrt(2.)-1.))));
-
-  cout << "Point on side of fundamental octagon inserted! " << endl;
-  emit(changed());
-
-}
-
-void
-MainWindow::on_actionInsertDummyPoints_triggered()
-{
-
-  std::vector<Point> pts;
-  cout << "Inserting dummy points now! " << endl;
-  
-  dummy_mode = true;
-
-  dt.insert_dummy_points(pts);
-  for (int i = 0; i < pts.size(); i++) {
-    processInput(make_object(pts[i]));
-  }
-
-  dummy_mode = false;
-
-  cout << "Dummy points inserted! " << endl;
-  emit(changed());
-
-}
-
-
-
-void
-MainWindow::on_actionModifyDepth_triggered()
-{
-  bool ok = false;
-  const int result = 
-    QInputDialog::getInt(this, 
-                        tr("Modify recursion depth"),
-                        tr("Enter new recursion depth"),
-           recursion_depth,
-           0,
-           10,
-           1,
-           &ok);
-
-  if(!ok) {
-    return;
-  }
-
-  recursion_depth = result;
-}
-
-
-void
-MainWindow::on_actionLoadPoints_triggered()
-{
-  QString fileName = QFileDialog::getOpenFileName(this,
-						  tr("Open Points file"),
-						  ".");
-  if(! fileName.isEmpty()){
-    open(fileName);
-  }
-}
-
-
-void
-MainWindow::open(QString fileName)
-{
-  // wait cursor
-  QApplication::setOverrideCursor(Qt::WaitCursor);
-  std::ifstream ifs(qPrintable(fileName));
-  
-  K::Point p;
-  std::vector<K::Point> points;
-  while(ifs >> p) {
-    points.push_back(p);
-  }
-  dt.insert(points.begin(), points.end());
-
-  // default cursor
-  QApplication::restoreOverrideCursor();
-  this->addToRecentFiles(fileName);
-  actionRecenter->trigger();
-  emit(changed());
-    
-}
-
-void
-MainWindow::on_actionSavePoints_triggered()
-{
-/*  // dump points
-  QString fileName = QFileDialog::getSaveFileName(this,
-						  tr("Save points"),
-						  ".");
-  if(! fileName.isEmpty()){
-    std::ofstream ofs(qPrintable(fileName));
-    for(Delaunay::Finite_vertices_iterator 
-          vit = dt.finite_vertices_begin(),
-          end = dt.finite_vertices_end();
-        vit!= end; ++vit)
-    {
-      ofs << vit->point() << std::endl;
-    }
-  }
-*/  
-  
-  // take a snapshot
-  std::cout << "snapshot...";
-  
-  const QRect viewerRect = graphicsView->mapFromScene(scene.sceneRect()).boundingRect();
-  const QRect imageRect = QRect(QPoint(0, 0), viewerRect.size()); 
-  
-  QImage snapshot(imageRect.size(), QImage::Format_ARGB32);//QImage::Format_ARGB32_Premultiplied
-  
-  QPainter painter(&snapshot);
-  painter.setRenderHint(QPainter::Antialiasing);
-  //painter.setRenderHint(QPainter::SmoothPixmapTransform);
-  
-  graphicsView->render(&painter, imageRect, viewerRect);
-  bool saved = snapshot.save("mysnap.png", "PNG", 100);
-  assert(saved == true);
-  
-  std::cout << "done" << std::endl;
-}
-
-
-void
-MainWindow::on_actionRecenter_triggered()
-{
-  this->graphicsView->setSceneRect(dgi->boundingRect());
-  this->graphicsView->fitInView(dgi->boundingRect(), Qt::KeepAspectRatio);  
-}
-
-
-#include "Periodic_4_hyperbolic_Delaunay_triangulation_2_demo.moc"
-
-int main(int argc, char **argv)
-{
-  QApplication app(argc, argv);
-
-  app.setOrganizationDomain("geometryfactory.com");
-  app.setOrganizationName("GeometryFactory");
-  app.setApplicationName("Periodic_4_hyperbolic_Delaunay_triangulation_2 demo");
-
-  // Import resources from libCGALQt4.
-  // See http://doc.trolltech.com/4.4/qdir.html#Q_INIT_RESOURCE
-  //Q_INIT_RESOURCE(File);
-  //Q_INIT_RESOURCE(Triangulation_2);
-  //Q_INIT_RESOURCE(Input);
-  //Q_INIT_RESOURCE(CGAL);
-
-  MainWindow mainWindow;
-  mainWindow.show();
-
-  QStringList args = app.arguments();
-  args.removeAt(0);
-  Q_FOREACH(QString filename, args) {
-    mainWindow.open(filename);
-  }
-
-  return app.exec();
-}
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/CGAL.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/CGAL.qrc
deleted file mode 100644
index ef08023c288..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/CGAL.qrc
+++ /dev/null
@@ -1,10 +0,0 @@
-<RCC>
-  <qresource prefix="/cgal/help" >
-    <file>about_CGAL.html</file>
-  </qresource>
-  <qresource prefix="/cgal/logos">
-    <file alias="CGAL.gif" >cgal_logo_ipe_2013.png</file>
-    <file alias="CGAL.png" >cgal_logo_ipe_2013.png</file>
-    <file alias="cgal_icon" >cgal_logo.xpm</file>
-  </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Delaunay_triangulation_2.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Delaunay_triangulation_2.png
deleted file mode 100644
index 36b51cf599e..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Delaunay_triangulation_2.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Delaunay_triangulation_2.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Delaunay_triangulation_2.qrc
deleted file mode 100644
index adaf1425154..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Delaunay_triangulation_2.qrc
+++ /dev/null
@@ -1,12 +0,0 @@
-<RCC>
-  <qresource prefix="/cgal/Actions" >
-    <file>conflict_zone.png</file>
-    <file>moving_point.png</file>
-    <file>triangulation.png</file>
-    <file>circumcenter.png</file>
-  </qresource>
-  <qresource prefix="/cgal/help" >
-    <file alias="about_CGAL.html">about_CGAL.html</file>
-    <file>about_Delaunay_triangulation_2.html</file>
-  </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/File.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/File.qrc
deleted file mode 100644
index 61d8ef4f390..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/File.qrc
+++ /dev/null
@@ -1,7 +0,0 @@
-<RCC>
-    <qresource prefix="/cgal/fileToolbar" >
-        <file>fileNew.png</file>
-        <file>fileOpen.png</file>
-        <file>fileSave.png</file>
-    </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G.png
deleted file mode 100644
index 719525886db..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G16.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G16.png
deleted file mode 100644
index 07704340074..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G16.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G2.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G2.png
deleted file mode 100644
index 76b3163d901..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G2.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G4.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G4.png
deleted file mode 100644
index 865e84b4c48..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G4.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G8.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G8.png
deleted file mode 100644
index 4f5c3ea3d01..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/G8.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Input.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Input.qrc
deleted file mode 100644
index 8a49bd278b3..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Input.qrc
+++ /dev/null
@@ -1,7 +0,0 @@
-<RCC>
-  <qresource prefix="/cgal/Input" >
-    <file>inputPoint.png</file>
-    <file alias="zoom-best-fit" >fit-page-32.png</file>
-    <file>inputPolyline.png</file>
-  </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Periodic_4_hyperbolic_triangulation_2.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Periodic_4_hyperbolic_triangulation_2.qrc
deleted file mode 100644
index ccd4a3e3bb7..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Periodic_4_hyperbolic_triangulation_2.qrc
+++ /dev/null
@@ -1,13 +0,0 @@
-<RCC>
-  <qresource prefix="/cgal/Actions">
-    <file>G2.png</file>
-    <file>G4.png</file>
-    <file>G8.png</file>
-    <file>G16.png</file>
-    <file>G.png</file>
-    <file>a.png</file>
-    <file>b.png</file>
-    <file>c.png</file>
-    <file>d.png</file>
-  </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Triangulation_2.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Triangulation_2.qrc
deleted file mode 100644
index 0daea7f0665..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Triangulation_2.qrc
+++ /dev/null
@@ -1,6 +0,0 @@
-<RCC>
-    <qresource prefix="/cgal/Triangulation_2" >
-        <file>Delaunay_triangulation_2.png</file>
-        <file>Voronoi_diagram_2.png</file>
-    </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Voronoi_diagram_2.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Voronoi_diagram_2.png
deleted file mode 100644
index 62437e6bfc9..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/Voronoi_diagram_2.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/a.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/a.png
deleted file mode 100644
index 40dab5cf244..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/a.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/about_CGAL.html b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/about_CGAL.html
deleted file mode 100644
index 6b2b2a5d943..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/about_CGAL.html
+++ /dev/null
@@ -1,8 +0,0 @@
-<html>
-  <body>
-    <p><img src=":/cgal/logos/CGAL.png"></p>
-    <h2>Computational Geometry Algorithms Library<!--CGAL_VERSION--></h2>
-    <p>CGAL provides efficient and reliable geometric algorithms in the form of a C++ library.</p>
-    <p>For more information visit <a href="http://www.cgal.org/">www.cgal.org</a></p>
-  </body>
-</html>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/b.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/b.png
deleted file mode 100644
index 47e246a4a2c..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/b.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/c.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/c.png
deleted file mode 100644
index 63574ac570c..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/c.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/cgal_logo.xpm b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/cgal_logo.xpm
deleted file mode 100644
index 6a69b3d67e1..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/cgal_logo.xpm
+++ /dev/null
@@ -1,24 +0,0 @@
-/* XPM */
-const char * demoicon_xpm[] = {
-/* columns rows colors chars-per-pixel */
-"16 16 3 1",
-" 	c None",
-".	c #FFFF00",
-"+	c #000000",
-/* pixels */
-"................",
-"...++++...++++..",
-"..+....+.+....+.",
-"..+......+......",
-"..+......+..+++.",
-"..+......+....+.",
-"..+....+.+....+.",
-"...++++...++++..",
-"................",
-"...++++...+.....",
-"..+....+..+.....",
-"..+....+..+.....",
-"..++++++..+.....",
-"..+....+..+.....",
-"..+....+..+++++.",
-"................"};
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/cgal_logo_ipe_2013.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/cgal_logo_ipe_2013.png
deleted file mode 100644
index 15fe4edb6af..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/cgal_logo_ipe_2013.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/circumcenter.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/circumcenter.png
deleted file mode 100644
index f743b7a64ca..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/circumcenter.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/conflict_zone.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/conflict_zone.png
deleted file mode 100644
index 5fd4d5b4ce6..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/conflict_zone.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/constrained_triangulation.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/constrained_triangulation.png
deleted file mode 100644
index 3a49172fa17..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/constrained_triangulation.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/d.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/d.png
deleted file mode 100644
index 9bf6f7d9bb0..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/d.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileNew.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileNew.png
deleted file mode 100644
index af5d1221412..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileNew.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileOpen.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileOpen.png
deleted file mode 100644
index fc6f17e9774..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileOpen.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileSave.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileSave.png
deleted file mode 100644
index 8feec99bee8..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fileSave.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fit-page-32.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fit-page-32.png
deleted file mode 100644
index 98bc12d3ed6..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/fit-page-32.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/inputPoint.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/inputPoint.png
deleted file mode 100644
index e9d53a20571..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/inputPoint.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/inputPolyline.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/inputPolyline.png
deleted file mode 100644
index 63d0a08cca3..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/inputPolyline.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/license.txt b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/license.txt
deleted file mode 100644
index ff11c043161..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/license.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-The following files have been copied from Qt Free Edition version 4.4:
-  fileNew.png
-  fileOpen.png
-  fileSave.png,
-  fit-page-32.png 
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/moving_point.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/moving_point.png
deleted file mode 100644
index 44f431d9843..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/moving_point.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/triangulation.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/triangulation.png
deleted file mode 100644
index ce082a6e08f..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/triangulation.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/zoom-best-fit.png b/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/zoom-best-fit.png
deleted file mode 100644
index 0df9f01776c..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/Periodic_4_hyperbolic_triangulation_2/backup/icons/zoom-best-fit.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/CMakeLists.txt b/Periodic_4_hyperbolic_triangulation_2/demo/temp/CMakeLists.txt
deleted file mode 100644
index 09983354192..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/CMakeLists.txt
+++ /dev/null
@@ -1,38 +0,0 @@
-# Created by the script cgal_create_cmake_script
-# This is the CMake script for compiling a CGAL application.
-
-project (Periodic_4_hyperbolic_triangulation_2_demo)
-
-# Find includes in corresponding build directories
-set(CMAKE_INCLUDE_CURRENT_DIR ON)
-
-# Instruct CMake to run moc automatically when needed.
-set(CMAKE_AUTOMOC ON)
-SET(CMAKE_AUTOUIC ON)  
-
-cmake_minimum_required(VERSION 2.8.11)
-if(POLICY CMP0043)
-  cmake_policy(SET CMP0043 OLD)
-endif()
-
-find_package(CGAL COMPONENTS Qt5)
-include(${CGAL_USE_FILE})
-
-find_package(Qt5 QUIET COMPONENTS Widgets)
-
-include_directories (BEFORE ../../include include ../../../Hyperbolic_triangulation_2/include)
-
-# ui files, created with Qt Designer
-qt5_wrap_ui( uis Periodic_4_hyperbolic_triangulation_2.ui )
-
-# qrc files (resources files, that contain icons, at least)
-qt5_add_resources ( RESOURCE_FILES resources/Periodic_4_hyperbolic_triangulation_2.qrc )
-
-
-# cpp files
-add_executable ( Periodic_4_hyperbolic_triangulation_2_demo Periodic_4_hyperbolic_triangulation_2_demo.cpp )
-qt5_use_modules( Periodic_4_hyperbolic_triangulation_2_demo Widgets)
-add_to_cached_list( CGAL_EXECUTABLE_TARGETS Periodic_4_hyperbolic_triangulation_2_demo )
-target_link_libraries( Periodic_4_hyperbolic_triangulation_2_demo ${CGAL_LIBRARIES} ${QT_LIBRARIES} ${CGAL_QT_LIBRARIES} )
-
-
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/Periodic_4_hyperbolic_triangulation_2.ui b/Periodic_4_hyperbolic_triangulation_2/demo/temp/Periodic_4_hyperbolic_triangulation_2.ui
deleted file mode 100644
index f215757914e..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/Periodic_4_hyperbolic_triangulation_2.ui
+++ /dev/null
@@ -1,438 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <author>GeometryFactory</author>
- <class>Periodic_4_hyperbolic_triangulationo_2_demo</class>
- <widget class="QMainWindow" name="Periodic_4_hyperbolic_triangulationo_2_demo">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>800</width>
-    <height>600</height>
-   </rect>
-  </property>
-  <property name="windowTitle">
-   <string>Periodic hyperbolic Delaunay triangulation</string>
-  </property>
-  <property name="windowIcon">
-   <iconset resource="icons/CGAL.qrc">
-    <normaloff>:/cgal/logos/cgal_icon</normaloff>:/cgal/logos/cgal_icon</iconset>
-  </property>
-  <widget class="QWidget" name="centralwidget">
-   <layout class="QGridLayout">
-    <item row="0" column="0">
-     <widget class="QGraphicsView" name="graphicsView">
-      <property name="focusPolicy">
-       <enum>Qt::StrongFocus</enum>
-      </property>
-      <property name="verticalScrollBarPolicy">
-       <enum>Qt::ScrollBarAlwaysOn</enum>
-      </property>
-      <property name="horizontalScrollBarPolicy">
-       <enum>Qt::ScrollBarAlwaysOn</enum>
-      </property>
-      <property name="transformationAnchor">
-       <enum>QGraphicsView::NoAnchor</enum>
-      </property>
-     </widget>
-    </item>
-   </layout>
-  </widget>
-  <widget class="QStatusBar" name="statusbar"/>
-  <widget class="QToolBar" name="fileToolBar">
-   <property name="windowTitle">
-    <string>File Tools</string>
-   </property>
-   <attribute name="toolBarArea">
-    <enum>TopToolBarArea</enum>
-   </attribute>
-   <attribute name="toolBarBreak">
-    <bool>false</bool>
-   </attribute>
-   <addaction name="actionClear"/>
-   <addaction name="actionLoadPoints"/>
-   <addaction name="actionSavePoints"/>
-  </widget>
-  <widget class="QToolBar" name="toolBar">
-   <property name="windowTitle">
-    <string>Visualization Tools</string>
-   </property>
-   <attribute name="toolBarArea">
-    <enum>TopToolBarArea</enum>
-   </attribute>
-   <attribute name="toolBarBreak">
-    <bool>false</bool>
-   </attribute>
-   <addaction name="actionInsertPoint"/>
-   <addaction name="actionDo_translation_a"/>
-   <addaction name="actionDo_translation_b"/>
-   <addaction name="actionDo_translation_c"/>
-   <addaction name="actionDo_translation_d"/>
-   <addaction name="actionMovingPoint"/>
-   <addaction name="actionCircumcenter"/>
-   <addaction name="actionShowConflictZone"/>
-   <addaction name="separator"/>
-   <addaction name="actionShowDelaunay"/>
-   <addaction name="actionShowVoronoi"/>
-   <addaction name="separator"/>
-   <addaction name="actionRecenter"/>
-  </widget>
-  <widget class="QMenuBar" name="menubar">
-   <property name="geometry">
-    <rect>
-     <x>0</x>
-     <y>0</y>
-     <width>800</width>
-     <height>22</height>
-    </rect>
-   </property>
-   <widget class="QMenu" name="menuFile">
-    <property name="title">
-     <string>&amp;File</string>
-    </property>
-    <addaction name="separator"/>
-    <addaction name="actionClear"/>
-    <addaction name="actionLoadPoints"/>
-    <addaction name="actionSavePoints"/>
-    <addaction name="separator"/>
-    <addaction name="actionQuit"/>
-   </widget>
-   <widget class="QMenu" name="menuEdit">
-    <property name="title">
-     <string>&amp;Edit</string>
-    </property>
-    <addaction name="actionInsertRandomPoints"/>
-    <addaction name="actionModify_recursion_depth"/>
-   </widget>
-   <widget class="QMenu" name="menuTools">
-    <property name="title">
-     <string>&amp;Tools</string>
-    </property>
-    <addaction name="actionInsertPoint"/>
-    <addaction name="actionDo_translation_a"/>
-    <addaction name="actionDo_translation_b"/>
-    <addaction name="actionDo_translation_c"/>
-    <addaction name="actionDo_translation_d"/>
-    <addaction name="actionG"/>
-    <addaction name="actionG2"/>
-    <addaction name="actionG4"/>
-    <addaction name="actionG8"/>
-    <addaction name="actionG16"/>
-    <addaction name="actionMovingPoint"/>
-    <addaction name="actionCircumcenter"/>
-    <addaction name="actionShowConflictZone"/>
-    <addaction name="separator"/>
-    <addaction name="actionShowDelaunay"/>
-    <addaction name="actionShowVoronoi"/>
-    <addaction name="separator"/>
-    <addaction name="actionRecenter"/>
-   </widget>
-   <addaction name="menuFile"/>
-   <addaction name="menuEdit"/>
-   <addaction name="menuTools"/>
-  </widget>
-  <action name="actionAbout">
-   <property name="text">
-    <string>&amp;About</string>
-   </property>
-  </action>
-  <action name="actionAboutCGAL">
-   <property name="text">
-    <string>About &amp;CGAL</string>
-   </property>
-  </action>
-  <action name="actionQuit">
-   <property name="text">
-    <string>&amp;Quit</string>
-   </property>
-   <property name="shortcut">
-    <string>Ctrl+Q</string>
-   </property>
-  </action>
-  <action name="actionInsertRandomPoints">
-   <property name="text">
-    <string>&amp;Insert random points</string>
-   </property>
-   <property name="shortcut">
-    <string>Ctrl+I</string>
-   </property>
-  </action>
-  <action name="actionChangeRecursionDepth">
-   <property name="text">
-    <string>&amp;Change recursion depth</string>
-   </property>
-  </action>
-  <action name="actionMovingPoint">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Delaunay_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/moving_point.png</normaloff>:/cgal/Actions/moving_point.png</iconset>
-   </property>
-   <property name="text">
-    <string>&amp;Simulate insertion</string>
-   </property>
-   <property name="toolTip">
-    <string comment="The comment">Simulate Insertion</string>
-   </property>
-   <property name="statusTip">
-    <string comment="and its comment">Move mouse with left button pressed to see where point would be inserted</string>
-   </property>
-   <property name="whatsThis">
-    <string comment="what">whats this</string>
-   </property>
-  </action>
-  <action name="actionInsertPoint">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="checked">
-    <bool>false</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Input.qrc">
-     <normaloff>:/cgal/Input/inputPoint.png</normaloff>:/cgal/Input/inputPoint.png</iconset>
-   </property>
-   <property name="text">
-    <string>&amp;Insert Point</string>
-   </property>
-   <property name="toolTip">
-    <string>Insert Point</string>
-   </property>
-   <property name="statusTip">
-    <string>Left: Insert vtx</string>
-   </property>
-  </action>
-  <action name="actionClear">
-   <property name="icon">
-    <iconset resource="icons/File.qrc">
-     <normaloff>:/cgal/fileToolbar/fileNew.png</normaloff>:/cgal/fileToolbar/fileNew.png</iconset>
-   </property>
-   <property name="text">
-    <string>&amp;Clear</string>
-   </property>
-   <property name="shortcut">
-    <string>Ctrl+C</string>
-   </property>
-  </action>
-  <action name="actionShowVoronoi">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="checked">
-    <bool>false</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Triangulation_2.qrc">
-     <normaloff>:/cgal/Triangulation_2/Voronoi_diagram_2.png</normaloff>:/cgal/Triangulation_2/Voronoi_diagram_2.png</iconset>
-   </property>
-   <property name="text">
-    <string>Show &amp;Voronoi Diagram</string>
-   </property>
-   <property name="shortcut">
-    <string>Ctrl+V</string>
-   </property>
-  </action>
-  <action name="actionShowDelaunay">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Delaunay_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/triangulation.png</normaloff>:/cgal/Actions/triangulation.png</iconset>
-   </property>
-   <property name="text">
-    <string>Show &amp;Delaunay Triangulation</string>
-   </property>
-   <property name="shortcut">
-    <string>Ctrl+D</string>
-   </property>
-  </action>
-  <action name="actionLoadPoints">
-   <property name="icon">
-    <iconset resource="icons/File.qrc">
-     <normaloff>:/cgal/fileToolbar/fileOpen.png</normaloff>:/cgal/fileToolbar/fileOpen.png</iconset>
-   </property>
-   <property name="text">
-    <string>&amp;Load Points...</string>
-   </property>
-   <property name="shortcut">
-    <string>Ctrl+L</string>
-   </property>
-  </action>
-  <action name="actionSavePoints">
-   <property name="icon">
-    <iconset resource="icons/File.qrc">
-     <normaloff>:/cgal/fileToolbar/fileSave.png</normaloff>:/cgal/fileToolbar/fileSave.png</iconset>
-   </property>
-   <property name="text">
-    <string>&amp;Save Points...</string>
-   </property>
-   <property name="shortcut">
-    <string>Ctrl+S</string>
-   </property>
-  </action>
-  <action name="actionCircumcenter">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset>
-     <normaloff>:/cgal/Actions/icons/circumcenter.png</normaloff>:/cgal/Actions/icons/circumcenter.png</iconset>
-   </property>
-   <property name="text">
-    <string>&amp;Circumcenter</string>
-   </property>
-   <property name="toolTip">
-    <string>Draw circumcenter</string>
-   </property>
-  </action>
-  <action name="actionRecenter">
-   <property name="icon">
-    <iconset resource="icons/Input.qrc">
-     <normaloff>:/cgal/Input/zoom-best-fit</normaloff>:/cgal/Input/zoom-best-fit</iconset>
-   </property>
-   <property name="text">
-    <string>Re&amp;center the viewport</string>
-   </property>
-   <property name="shortcut">
-    <string>Ctrl+R</string>
-   </property>
-  </action>
-  <action name="actionShowConflictZone">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset>
-     <normaloff>:/cgal/Actions/icons/conflict_zone.png</normaloff>:/cgal/Actions/icons/conflict_zone.png</iconset>
-   </property>
-   <property name="text">
-    <string>Show Conflict Zone</string>
-   </property>
-  </action>
-  <action name="actionDo_translation_a">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/a.png</normaloff>:/cgal/Actions/a.png</iconset>
-   </property>
-   <property name="text">
-    <string>Do translation &quot;a&quot;</string>
-   </property>
-  </action>
-  <action name="actionDo_translation_b">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/b.png</normaloff>:/cgal/Actions/b.png</iconset>
-   </property>
-   <property name="text">
-    <string>Do translation &quot;b&quot;</string>
-   </property>
-  </action>
-  <action name="actionDo_translation_c">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/c.png</normaloff>:/cgal/Actions/c.png</iconset>
-   </property>
-   <property name="text">
-    <string>Do translation &quot;c&quot;</string>
-   </property>
-  </action>
-  <action name="actionDo_translation_d">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/d.png</normaloff>:/cgal/Actions/d.png</iconset>
-   </property>
-   <property name="text">
-    <string>Do translation &quot;d&quot;</string>
-   </property>
-  </action>
-  <action name="actionG">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/G.png</normaloff>:/cgal/Actions/G.png</iconset>
-   </property>
-   <property name="text">
-    <string>G</string>
-   </property>
-  </action>
-  <action name="actionG2">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/G2.png</normaloff>:/cgal/Actions/G2.png</iconset>
-   </property>
-   <property name="text">
-    <string>G2</string>
-   </property>
-  </action>
-  <action name="actionG4">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/G4.png</normaloff>:/cgal/Actions/G4.png</iconset>
-   </property>
-   <property name="text">
-    <string>G4</string>
-   </property>
-  </action>
-  <action name="actionG8">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/G8.png</normaloff>:/cgal/Actions/G8.png</iconset>
-   </property>
-   <property name="text">
-    <string>G8</string>
-   </property>
-  </action>
-  <action name="actionG16">
-   <property name="checkable">
-    <bool>true</bool>
-   </property>
-   <property name="icon">
-    <iconset resource="icons/Periodic_4_hyperbolic_triangulation_2.qrc">
-     <normaloff>:/cgal/Actions/G16.png</normaloff>:/cgal/Actions/G16.png</iconset>
-   </property>
-   <property name="text">
-    <string>G16</string>
-   </property>
-  </action>
-  <action name="actionModify_recursion_depth">
-   <property name="text">
-    <string>Modify recursion depth</string>
-   </property>
-  </action>
- </widget>
- <resources>
-  <include location="icons/Periodic_4_hyperbolic_triangulation_2.qrc"/>
-  <include location="icons/Delaunay_triangulation_2.qrc"/>
-  <include location="icons/Triangulation_2.qrc"/>
-  <include location="icons/Input.qrc"/>
-  <include location="icons/File.qrc"/>
-  <include location="icons/CGAL.qrc"/>
- </resources>
- <connections/>
-</ui>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/Periodic_4_hyperbolic_triangulation_2_demo.cpp b/Periodic_4_hyperbolic_triangulation_2/demo/temp/Periodic_4_hyperbolic_triangulation_2_demo.cpp
deleted file mode 100644
index 67783e71b04..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/Periodic_4_hyperbolic_triangulation_2_demo.cpp
+++ /dev/null
@@ -1,461 +0,0 @@
-#include <fstream>
-
-// CGAL headers
-#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
-#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
-#include <CGAL/Delaunay_hyperbolic_triangulation_2.h>
-//#include <CGAL/Periodic_4_Delaunay_hyperbolic_triangulation_2.h>
-#include <CGAL/Triangulation_hyperbolic_traits_2.h>
-
-// to be deleted
-#include <CGAL/Qt/HyperbolicPainterOstream.h>
-//
-
-#include <CGAL/point_generators_2.h>
-
-// Qt headers
-#include <QtGui>
-#include <QString>
-#include <QActionGroup>
-#include <QFileDialog>
-#include <QInputDialog>
-#include <QGraphicsEllipseItem>
-
-// GraphicsView items and event filters (input classes)
-#include <CGAL/Qt/TriangulationCircumcircle.h>
-#include <CGAL/Qt/TriangulationMovingPoint.h>
-#include <CGAL/Qt/TriangulationConflictZone.h>
-#include <CGAL/Qt/TriangulationRemoveVertex.h>
-#include <CGAL/Qt/TriangulationPointInputAndConflictZone.h>
-#include <CGAL/Qt/TriangulationGraphicsItem.h>
-#include <CGAL/Qt/VoronoiGraphicsItem.h>
-
-// for viewportsBbox
-#include <CGAL/Qt/utility.h>
-  
-// the two base classes
-#include "ui_Periodic_4_hyperbolic_triangulation_2.h"
-#include <CGAL/Qt/DemosMainWindow.h>
-
-typedef CGAL::Exact_predicates_inexact_constructions_kernel       R;
-typedef CGAL::Triangulation_hyperbolic_traits_2<R>                K;
-
-typedef K::Point_2                                                Point_2;
-typedef K::Iso_rectangle_2                                        Iso_rectangle_2;
- 
-//typedef CGAL::Periodic_4_Delaunay_hyperbolic_triangulation_2<K>   Delaunay;
-typedef CGAL::Delaunay_hyperbolic_triangulation_2<K>              Delaunay;
-
-class MainWindow :
-  public CGAL::Qt::DemosMainWindow,
-  public Ui::Periodic_4_hyperbolic_triangulationo_2_demo
-{
-  Q_OBJECT
-  
-private:  
-  Delaunay                                                      dt;
-  QGraphicsEllipseItem*                                         disk;
-  QGraphicsScene                                                scene;  
-
-  CGAL::Qt::TriangulationGraphicsItem<Delaunay>               * dgi;
-  CGAL::Qt::VoronoiGraphicsItem<Delaunay>                     * vgi;
-
-  CGAL::Qt::TriangulationMovingPoint<Delaunay>                * mp;
-  CGAL::Qt::TriangulationConflictZone<Delaunay>               * cz;
-  CGAL::Qt::TriangulationRemoveVertex<Delaunay>               * trv;
-  CGAL::Qt::TriangulationPointInputAndConflictZone<Delaunay>  * pi;
-  CGAL::Qt::TriangulationCircumcircle<Delaunay>               *tcc;
-public:
-  MainWindow();
-
-public slots:
-
-  void processInput(CGAL::Object o);
-
-  void on_actionMovingPoint_toggled(bool checked);
-
-  void on_actionShowConflictZone_toggled(bool checked);
-
-  void on_actionCircumcenter_toggled(bool checked);
-
-  void on_actionShowDelaunay_toggled(bool checked);
-
-  void on_actionShowVoronoi_toggled(bool checked);
-
-  void on_actionInsertPoint_toggled(bool checked);
-  
-  void on_actionInsertRandomPoints_triggered();
-
-  void on_actionModify_recursion_depth_triggered();
-
-  void on_actionLoadPoints_triggered();
-
-  void on_actionSavePoints_triggered();
-
-  void on_actionClear_triggered();
-
-  void on_actionRecenter_triggered();
-
-  virtual void open(QString fileName);
-
-signals:
-  void changed();
-};
-
-MainWindow::MainWindow()
-  : DemosMainWindow(), dt(K(1))
-{
-  setupUi(this);
-
-  this->graphicsView->setAcceptDrops(false);
-  
-  // Add Poincaré disk
-  qreal origin_x = 0, origin_y = 0, radius = 1, diameter = 2*radius;
-  qreal left_top_corner_x = origin_x - radius;
-  qreal left_top_corner_y = origin_y - radius;
-  qreal width = diameter, height = diameter;
-  
-  disk = new QGraphicsEllipseItem(left_top_corner_x, left_top_corner_y, width, height);
-
-  QPen pen;  // creates a default pen
-  pen.setWidth(0);
-  pen.setBrush(Qt::black);
-  disk->setPen(pen);
-  
-  scene.addItem(disk);
-  
-  // delete:
-  //
-    
-  // Add a GraphicItem for the Delaunay triangulation
-  dgi = new CGAL::Qt::TriangulationGraphicsItem<Delaunay>(&dt);
-
-  QObject::connect(this, SIGNAL(changed()),
-		   dgi, SLOT(modelChanged()));
-
-  dgi->setVerticesPen(QPen(Qt::red, 3, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
-  scene.addItem(dgi);
-
-  // Add a GraphicItem for the Voronoi diagram
-  vgi = new CGAL::Qt::VoronoiGraphicsItem<Delaunay>(&dt);
-
-  QObject::connect(this, SIGNAL(changed()),
-		   vgi, SLOT(modelChanged()));
-
-  vgi->setEdgesPen(QPen(Qt::blue, 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
-  scene.addItem(vgi);
-  vgi->hide();
-
-  // Setup input handlers. They get events before the scene gets them
-  // and the input they generate is passed to the triangulation with 
-  // the signal/slot mechanism    
-  pi = new CGAL::Qt::TriangulationPointInputAndConflictZone<Delaunay>(&scene, &dt, this );
-
-  QObject::connect(pi, SIGNAL(generate(CGAL::Object)),
-		   this, SLOT(processInput(CGAL::Object)));
-
-  mp = new CGAL::Qt::TriangulationMovingPoint<Delaunay>(&dt, this);
-  // TriangulationMovingPoint<Delaunay> emits a modelChanged() signal each
-  // time the moving point moves.
-  // The following connection is for the purpose of emitting changed().
-  QObject::connect(mp, SIGNAL(modelChanged()),
-		   this, SIGNAL(changed()));
-
-  trv = new CGAL::Qt::TriangulationRemoveVertex<Delaunay>(&dt, this);
-  QObject::connect(trv, SIGNAL(modelChanged()),
-		   this, SIGNAL(changed()));
-
-  tcc = new CGAL::Qt::TriangulationCircumcircle<Delaunay>(&scene, &dt, this);
-  tcc->setPen(QPen(Qt::red, 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
-
-  cz = new CGAL::Qt::TriangulationConflictZone<Delaunay>(&scene, &dt, this);
-
-  // 
-  // Manual handling of actions
-  //
-
-  QObject::connect(this->actionQuit, SIGNAL(triggered()), 
-		   this, SLOT(close()));
-
-  // We put mutually exclusive actions in an QActionGroup
-  QActionGroup* ag = new QActionGroup(this);
-  ag->addAction(this->actionInsertPoint);
-  ag->addAction(this->actionMovingPoint);
-  ag->addAction(this->actionCircumcenter);
-  ag->addAction(this->actionShowConflictZone);
-
-  // Check two actions 
-  this->actionInsertPoint->setChecked(true);
-  this->actionShowDelaunay->setChecked(true);
-
-  //
-  // Setup the scene and the view
-  //
-  scene.setItemIndexMethod(QGraphicsScene::NoIndex);
-  scene.setSceneRect(left_top_corner_x, left_top_corner_y, width, height);
-  this->graphicsView->setScene(&scene);
-  this->graphicsView->setMouseTracking(true);
-  
-  // we want to adjust the coordinates of QGraphicsView to the coordinates of QGraphicsScene
-  // the following line must do this:
-  //   this->graphicsView->fitInView( scene.sceneRect(), Qt::KeepAspectRatio);
-  // It does not do this sufficiently well.
-  // Current solution:
-  this->graphicsView->shear(230, 230);
-  
-  // adjust the coordinate system
-  this->graphicsView->rotate(90);
-                                                      
-  // The navigation adds zooming and translation functionality to the
-  // QGraphicsView
-  this->addNavigation(this->graphicsView);
-
-  this->setupStatusBar();
-  this->setupOptionsMenu();
-  this->addAboutDemo(":/cgal/help/about_Delaunay_triangulation_2.html");
-  this->addAboutCGAL();
-
-  this->addRecentFiles(this->menuFile, this->actionQuit);
-  connect(this, SIGNAL(openRecentFile(QString)),
-	  this, SLOT(open(QString)));
-}
-
-
-void
-MainWindow::processInput(CGAL::Object o)
-{
-  Point_2 p;
-  if(CGAL::assign(p, o)){
-    QPointF qp(CGAL::to_double(p.x()), CGAL::to_double(p.y()));
-    
-    // note that if the point is on the boundary then the disk contains the point
-    if(disk->contains(qp)){
-      dt.insert(p);
-    }
-  }
-  emit(changed());
-}
-
-
-/* 
- *  Qt Automatic Connections
- *  http://doc.trolltech.com/4.4/designer-using-a-component.html#automatic-connections
- * 
- *  setupUi(this) generates connections to the slots named
- *  "on_<action_name>_<signal_name>"
- */
-void
-MainWindow::on_actionInsertPoint_toggled(bool checked)
-{
-  if(checked){
-    scene.installEventFilter(pi);
-    scene.installEventFilter(trv);
-  } else {
-    scene.removeEventFilter(pi);
-    scene.removeEventFilter(trv);
-  }
-}
-
-
-void
-MainWindow::on_actionMovingPoint_toggled(bool checked)
-{
-
-  if(checked){
-    scene.installEventFilter(mp);
-  } else {
-    scene.removeEventFilter(mp);
-  }
-}
-
-
-void
-MainWindow::on_actionShowConflictZone_toggled(bool checked)
-{
-
-  if(checked){
-    scene.installEventFilter(cz);
-  } else {
-    scene.removeEventFilter(cz);
-  }
-}
-
-void
-MainWindow::on_actionCircumcenter_toggled(bool checked)
-{
-  if(checked){
-    scene.installEventFilter(tcc);
-    tcc->show();
-  } else {  
-    scene.removeEventFilter(tcc);
-    tcc->hide();
-  }
-}
-
-
-void
-MainWindow::on_actionShowDelaunay_toggled(bool checked)
-{
-  dgi->setVisibleEdges(checked);
-}
-
-
-void
-MainWindow::on_actionShowVoronoi_toggled(bool checked)
-{
-  vgi->setVisible(checked);
-}
-
-
-void
-MainWindow::on_actionClear_triggered()
-{
-  dt.clear();
-  emit(changed());
-}
-
-
-void
-MainWindow::on_actionModify_recursion_depth_triggered()
-{
-    bool ok = false;
-    const int depth = 
-      QInputDialog::getInt(this, 
-                        tr("Recursion depth"),
-                        tr("Enter new value for recursion depth"),
-           0,
-           0,
-           std::numeric_limits<int>::max(),
-           1,
-           &ok);
-
-    if (!ok) {
-      return;
-    }
-
-    //dt.Set_recursion_depth(depth);
-}
-
-
-void
-MainWindow::on_actionInsertRandomPoints_triggered()
-{
-  CGAL::Random_points_in_disc_2<Point_2, CGAL::Creator_uniform_2<int, Point_2> > pg(1.0);
-  bool ok = false;
-  const int number_of_points = 
-    QInputDialog::getInt(this, 
-                        tr("Number of random points"),
-                        tr("Enter number of random points"),
-			     100,
-			     0,
-			     std::numeric_limits<int>::max(),
-			     1,
-			     &ok);
-
-  if(!ok) {
-    return;
-  }
-
-  // wait cursor
-  QApplication::setOverrideCursor(Qt::WaitCursor);
-  std::vector<Point_2> points;
-  points.reserve(number_of_points);
-  for(int i = 0; i < number_of_points; ++i){
-    points.push_back(*pg++);
-  }
-  dt.insert(points.begin(), points.end());
-  // default cursor
-  QApplication::restoreOverrideCursor();
-  emit(changed());
-}
-
-
-void
-MainWindow::on_actionLoadPoints_triggered()
-{
-  QString fileName = QFileDialog::getOpenFileName(this,
-						  tr("Open Points file"),
-						  ".");
-  if(! fileName.isEmpty()){
-    open(fileName);
-  }
-}
-
-
-void
-MainWindow::open(QString fileName)
-{
-  // wait cursor
-  QApplication::setOverrideCursor(Qt::WaitCursor);
-  std::ifstream ifs(qPrintable(fileName));
-  
-  K::Point_2 p;
-  std::vector<K::Point_2> points;
-  while(ifs >> p) {
-    points.push_back(p);
-  }
-  dt.insert(points.begin(), points.end());
-
-  // default cursor
-  QApplication::restoreOverrideCursor();
-  this->addToRecentFiles(fileName);
-  actionRecenter->trigger();
-  emit(changed());
-    
-}
-
-void
-MainWindow::on_actionSavePoints_triggered()
-{
-  QString fileName = QFileDialog::getSaveFileName(this,
-						  tr("Save points"),
-						  ".");
-  if(! fileName.isEmpty()){
-    std::ofstream ofs(qPrintable(fileName));
-    for(Delaunay::Finite_vertices_iterator 
-          vit = dt.finite_vertices_begin(),
-          end = dt.finite_vertices_end();
-        vit!= end; ++vit)
-    {
-      ofs << vit->point() << std::endl;
-    }
-  }
-}
-
-
-void
-MainWindow::on_actionRecenter_triggered()
-{
-  this->graphicsView->setSceneRect(dgi->boundingRect());
-  this->graphicsView->fitInView(dgi->boundingRect(), Qt::KeepAspectRatio);  
-}
-
-
-#include "Periodic_4_hyperbolic_triangulation_2_demo.moc"
-
-int main(int argc, char **argv)
-{
-  QApplication app(argc, argv);
-
-  app.setOrganizationDomain("geometryfactory.com");
-  app.setOrganizationName("GeometryFactory");
-  app.setApplicationName("Delaunay_triangulation_2 demo");
-
-  // Import resources from libCGALQt4.
-  // See http://doc.trolltech.com/4.4/qdir.html#Q_INIT_RESOURCE
-  Q_INIT_RESOURCE(File);
-  Q_INIT_RESOURCE(Triangulation_2);
-  Q_INIT_RESOURCE(Input);
-  Q_INIT_RESOURCE(CGAL);
-
-  MainWindow mainWindow;
-  mainWindow.show();
-
-  QStringList args = app.arguments();
-  args.removeAt(0);
-  Q_FOREACH(QString filename, args) {
-    mainWindow.open(filename);
-  }
-
-  return app.exec();
-}
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/CGAL.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/CGAL.qrc
deleted file mode 100644
index ef08023c288..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/CGAL.qrc
+++ /dev/null
@@ -1,10 +0,0 @@
-<RCC>
-  <qresource prefix="/cgal/help" >
-    <file>about_CGAL.html</file>
-  </qresource>
-  <qresource prefix="/cgal/logos">
-    <file alias="CGAL.gif" >cgal_logo_ipe_2013.png</file>
-    <file alias="CGAL.png" >cgal_logo_ipe_2013.png</file>
-    <file alias="cgal_icon" >cgal_logo.xpm</file>
-  </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Delaunay_triangulation_2.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Delaunay_triangulation_2.png
deleted file mode 100644
index 36b51cf599e..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Delaunay_triangulation_2.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Delaunay_triangulation_2.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Delaunay_triangulation_2.qrc
deleted file mode 100644
index adaf1425154..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Delaunay_triangulation_2.qrc
+++ /dev/null
@@ -1,12 +0,0 @@
-<RCC>
-  <qresource prefix="/cgal/Actions" >
-    <file>conflict_zone.png</file>
-    <file>moving_point.png</file>
-    <file>triangulation.png</file>
-    <file>circumcenter.png</file>
-  </qresource>
-  <qresource prefix="/cgal/help" >
-    <file alias="about_CGAL.html">about_CGAL.html</file>
-    <file>about_Delaunay_triangulation_2.html</file>
-  </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/File.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/File.qrc
deleted file mode 100644
index 61d8ef4f390..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/File.qrc
+++ /dev/null
@@ -1,7 +0,0 @@
-<RCC>
-    <qresource prefix="/cgal/fileToolbar" >
-        <file>fileNew.png</file>
-        <file>fileOpen.png</file>
-        <file>fileSave.png</file>
-    </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G.png
deleted file mode 100644
index 719525886db..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G16.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G16.png
deleted file mode 100644
index 07704340074..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G16.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G2.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G2.png
deleted file mode 100644
index 76b3163d901..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G2.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G4.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G4.png
deleted file mode 100644
index 865e84b4c48..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G4.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G8.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G8.png
deleted file mode 100644
index 4f5c3ea3d01..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/G8.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Input.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Input.qrc
deleted file mode 100644
index 8a49bd278b3..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Input.qrc
+++ /dev/null
@@ -1,7 +0,0 @@
-<RCC>
-  <qresource prefix="/cgal/Input" >
-    <file>inputPoint.png</file>
-    <file alias="zoom-best-fit" >fit-page-32.png</file>
-    <file>inputPolyline.png</file>
-  </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Periodic_4_hyperbolic_triangulation_2.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Periodic_4_hyperbolic_triangulation_2.qrc
deleted file mode 100644
index ccd4a3e3bb7..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Periodic_4_hyperbolic_triangulation_2.qrc
+++ /dev/null
@@ -1,13 +0,0 @@
-<RCC>
-  <qresource prefix="/cgal/Actions">
-    <file>G2.png</file>
-    <file>G4.png</file>
-    <file>G8.png</file>
-    <file>G16.png</file>
-    <file>G.png</file>
-    <file>a.png</file>
-    <file>b.png</file>
-    <file>c.png</file>
-    <file>d.png</file>
-  </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Triangulation_2.qrc b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Triangulation_2.qrc
deleted file mode 100644
index 0daea7f0665..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Triangulation_2.qrc
+++ /dev/null
@@ -1,6 +0,0 @@
-<RCC>
-    <qresource prefix="/cgal/Triangulation_2" >
-        <file>Delaunay_triangulation_2.png</file>
-        <file>Voronoi_diagram_2.png</file>
-    </qresource>
-</RCC>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Voronoi_diagram_2.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Voronoi_diagram_2.png
deleted file mode 100644
index 62437e6bfc9..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/Voronoi_diagram_2.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/a.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/a.png
deleted file mode 100644
index 40dab5cf244..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/a.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/about_CGAL.html b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/about_CGAL.html
deleted file mode 100644
index 6b2b2a5d943..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/about_CGAL.html
+++ /dev/null
@@ -1,8 +0,0 @@
-<html>
-  <body>
-    <p><img src=":/cgal/logos/CGAL.png"></p>
-    <h2>Computational Geometry Algorithms Library<!--CGAL_VERSION--></h2>
-    <p>CGAL provides efficient and reliable geometric algorithms in the form of a C++ library.</p>
-    <p>For more information visit <a href="http://www.cgal.org/">www.cgal.org</a></p>
-  </body>
-</html>
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/b.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/b.png
deleted file mode 100644
index 47e246a4a2c..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/b.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/c.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/c.png
deleted file mode 100644
index 63574ac570c..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/c.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/cgal_logo.xpm b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/cgal_logo.xpm
deleted file mode 100644
index 6a69b3d67e1..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/cgal_logo.xpm
+++ /dev/null
@@ -1,24 +0,0 @@
-/* XPM */
-const char * demoicon_xpm[] = {
-/* columns rows colors chars-per-pixel */
-"16 16 3 1",
-" 	c None",
-".	c #FFFF00",
-"+	c #000000",
-/* pixels */
-"................",
-"...++++...++++..",
-"..+....+.+....+.",
-"..+......+......",
-"..+......+..+++.",
-"..+......+....+.",
-"..+....+.+....+.",
-"...++++...++++..",
-"................",
-"...++++...+.....",
-"..+....+..+.....",
-"..+....+..+.....",
-"..++++++..+.....",
-"..+....+..+.....",
-"..+....+..+++++.",
-"................"};
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/cgal_logo_ipe_2013.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/cgal_logo_ipe_2013.png
deleted file mode 100644
index 15fe4edb6af..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/cgal_logo_ipe_2013.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/circumcenter.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/circumcenter.png
deleted file mode 100644
index f743b7a64ca..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/circumcenter.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/conflict_zone.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/conflict_zone.png
deleted file mode 100644
index 5fd4d5b4ce6..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/conflict_zone.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/constrained_triangulation.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/constrained_triangulation.png
deleted file mode 100644
index 3a49172fa17..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/constrained_triangulation.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/d.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/d.png
deleted file mode 100644
index 9bf6f7d9bb0..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/d.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileNew.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileNew.png
deleted file mode 100644
index af5d1221412..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileNew.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileOpen.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileOpen.png
deleted file mode 100644
index fc6f17e9774..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileOpen.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileSave.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileSave.png
deleted file mode 100644
index 8feec99bee8..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fileSave.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fit-page-32.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fit-page-32.png
deleted file mode 100644
index 98bc12d3ed6..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/fit-page-32.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/inputPoint.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/inputPoint.png
deleted file mode 100644
index e9d53a20571..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/inputPoint.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/inputPolyline.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/inputPolyline.png
deleted file mode 100644
index 63d0a08cca3..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/inputPolyline.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/license.txt b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/license.txt
deleted file mode 100644
index ff11c043161..00000000000
--- a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/license.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-The following files have been copied from Qt Free Edition version 4.4:
-  fileNew.png
-  fileOpen.png
-  fileSave.png,
-  fit-page-32.png 
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/moving_point.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/moving_point.png
deleted file mode 100644
index 44f431d9843..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/moving_point.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/triangulation.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/triangulation.png
deleted file mode 100644
index ce082a6e08f..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/triangulation.png and /dev/null differ
diff --git a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/zoom-best-fit.png b/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/zoom-best-fit.png
deleted file mode 100644
index 0df9f01776c..00000000000
Binary files a/Periodic_4_hyperbolic_triangulation_2/demo/temp/icons/zoom-best-fit.png and /dev/null differ