Update LCC demo

Linear_cell_complex/demo/Linear_cell_complex/CMakeLists.txt

@@ -64,7 +64,7 @@ add_executable(Linear_cell_complex_3_demo
 
 add_to_cached_list(CGAL_EXECUTABLE_TARGETS Linear_cell_complex_3_demo)
 
-target_link_libraries(Linear_cell_complex_3_demo PRIVATE
+target_link_libraries(Linear_cell_complex_3_demo PUBLIC
   CGAL::CGAL CGAL::CGAL_Qt5 Qt5::Gui Qt5::OpenGL)
 
 include(${CGAL_MODULES_DIR}/CGAL_add_test.cmake)

Linear_cell_complex/demo/Linear_cell_complex/Linear_cell_complex_3_demo.cpp

@@ -39,7 +39,7 @@ int main(int argc, char** argv)
   application.setApplicationName("3D Linear Cell Complex");
   //for windows
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 3, 0))
-  application.setAttribute(Qt::AA_UseDesktopOpenGL);
+  // application.setAttribute(Qt::AA_UseDesktopOpenGL);
 #endif
 
   // Import resources from libCGALQt5

Linear_cell_complex/demo/Linear_cell_complex/MainWindow.cpp

@@ -78,7 +78,7 @@ MainWindow::MainWindow (QWidget * parent) : CGAL::Qt::DemosMainWindow (parent),
 
   QObject::connect(&dialogmesh, SIGNAL(accepted()),
                    this, SLOT(onCreateMeshOk()));
-  this->viewer->setScene(&scene);
+  this->viewer->setScene(&scene, false);
 
   connect_actions ();
   this->addAboutDemo (":/cgal/help/about_Linear_cell_complex_3.html");

Linear_cell_complex/demo/Linear_cell_complex/Viewer.cpp

@@ -37,8 +37,8 @@ Viewer::Viewer(QWidget* parent) :
     inverse_normal(false),
     size_points(7.),
     size_edges(3.1),
-    ambient(0.6f, 0.5f, 0.5f, 0.5f),
     m_previous_scene_empty(true)
+//    ambient(0.6f, 0.5f, 0.5f, 0.5f),
 {}
 
 Viewer::~Viewer()
@@ -53,10 +53,9 @@ void Viewer::sceneChanged()
                                       CGAL::qglviewer::Vec(m_bounding_box.xmax(),
                                                      m_bounding_box.ymax(),
                                                      m_bounding_box.zmax()));
+  Base::redraw();
   if (m_previous_scene_empty)
     this->showEntireScene();
-  else
-    this->update();
 
   m_previous_scene_empty = scene->lcc->is_empty(); // for the next call to sceneChanged
 }
@@ -132,7 +131,7 @@ void Viewer::keyPressEvent(QKeyEvent *e)
     displayMessage(QString("Size of points=%1.").arg(size_points));
     update();
   }
-  else if ((e->key()==Qt::Key_PageUp) && (modifiers==Qt::NoButton))
+/*  else if ((e->key()==Qt::Key_PageUp) && (modifiers==Qt::NoButton))
   {
     ambient.setX(ambient.x()+.1);
     if (ambient.x()>1.) ambient.setX(1.);
@@ -203,9 +202,9 @@ void Viewer::keyPressEvent(QKeyEvent *e)
     displayMessage(QString("Light color=(%1 %2 %3).").
         arg(ambient.x()).arg(ambient.y()).arg(ambient.z()));
     update();
-  }
+  }*/
   else
-    CGAL::QGLViewer::keyPressEvent(e);
+    Base::keyPressEvent(e);
 }
 
 QString Viewer::helpString() const

Linear_cell_complex/demo/Linear_cell_complex/Viewer.h

@@ -51,10 +51,10 @@ public:
   Viewer(QWidget* parent);
   ~Viewer();
 
-  void setScene(Scene* scene_)
+  void setScene(Scene* scene_, bool doredraw=true)
   {
     scene = scene_;
-    set_lcc(scene->lcc);
+    set_lcc(scene->lcc, doredraw);
   }
 
 public:
@@ -92,10 +92,10 @@ private:
   double size_points;
   double size_edges;
 
-  QVector4D ambient;
+  // QVector4D ambient;
   
   bool m_previous_scene_empty;
-  bool are_buffers_initialized;
+  // bool are_buffers_initialized;
 
   //Shaders elements
   // int vertexLocation[3];

Linear_cell_complex/include/CGAL/draw_linear_cell_complex.h

@@ -103,10 +103,11 @@ public:
   }
 
 protected:
-  void set_lcc(const LCC* alcc)
+  void set_lcc(const LCC* alcc, bool doredraw=true)
   {
     lcc=alcc;
     compute_elements();
+    if (doredraw) { redraw(); }
   }
   
   void compute_face(Dart_const_handle dh)