xref: /dports/math/cgal/CGAL-5.3/demo/Polyhedron/Viewer.cpp

#include "Viewer.h"
#include <CGAL/Three/Scene_draw_interface.h>
#include <QMouseEvent>
#include <QKeyEvent>
#include <QSettings>
#include <QDebug>
#include <QSettings>
#include <QOpenGLShader>
#include <QFileDialog>
#include <QOpenGLShaderProgram>
#include <QOpenGLFramebufferObject>
#include <QMessageBox>
#include <QColorDialog>
#include <QInputDialog>
#include <cmath>
#include <QApplication>
#include <QOpenGLDebugLogger>
#include <QStyleFactory>
#include <QAction>
#include <QMultipleInputDialog.h>
#include <QRegularExpressionMatch>
#ifdef CGAL_USE_WEBSOCKETS
#include <QtWebSockets/QWebSocket>
#endif

#include <CGAL/Three/Three.h>

#include "ui_LightingDialog.h"
#include "CGAL_double_edit.h"

#if defined(_WIN32)
#include <QMimeData>
#include <QByteArray>
#include <QBuffer>
#endif
#define ORIGINAL_FOV 0.94853805396568136

class Viewer_impl {
public:
  CGAL::Three::Scene_draw_interface* scene;
  Viewer *viewer;
  Viewer *shareViewer;
  bool antialiasing;
  bool twosides;
  bool macro_mode;
  bool inFastDrawing;
  bool inDrawWithNames;
  bool clipping;
  bool projection_is_ortho;
  bool cam_sharing;
  bool scene_scaling;
  GLfloat gl_point_size;
  QVector4D clipbox[6];
  QVector3D scaler;
  QPainter *painter;

  // L i g h t i n g
  QVector4D position;
  QVector4D ambient;
  QVector4D diffuse;
  QVector4D specular;
  float spec_power;

  //Back and Front Colors
  QColor front_color;
  QColor back_color;

  // M e s s a g e s
  QString message;
  bool _displayMessage;
  QTimer messageTimer;
  QOpenGLFunctions_4_3_Core* _recentFunctions;
  bool is_2d_selection_mode;

  // D e p t h  P e e l i n g
  // \param pass the current pass in the Depth Peeling (transparency) algorithm.
  // -1 means that no depth peeling is applied.
  // \param writing_depth means that the color of the faces will be drawn in a grayscale
  // according to the depth of the fragment in the shader. It is used by the transparency.
  // \param fbo contains the texture used by the Depth Peeling algorithm.
  // Should be NULL if pass <= 0;
  int current_pass;
  bool writing_depth;
  int total_pass;
  int current_total_pass;
  QOpenGLFramebufferObject* dp_fbo;
  QOpenGLDebugLogger *logger;


  //! The buffers used to draw the axis system
  QOpenGLBuffer buffer;
  //! The VAO used to draw the axis system
  QOpenGLVertexArrayObject vao;
  //! The rendering program used to draw the distance
  QOpenGLShaderProgram rendering_program_dist;
  QList<TextItem*>  distance_text;
  //! Decides if the text is displayed in the drawVisualHints function.
  bool has_text;
  //! Decides if the distance between APoint and BPoint must be drawn;
  bool distance_is_displayed;
  bool i_is_pressed;
  bool z_is_pressed;
  QImage static_image;
  //!Draws the distance between two selected points.
  void showDistance(QPoint);
  CGAL::qglviewer::Vec APoint;
  CGAL::qglviewer::Vec BPoint;
  bool is_d_pressed;
  bool extension_is_found;
  int quality;

  TextRenderer *textRenderer;
  //!Clears the distance display
  void clearDistancedisplay();
  void draw_aux(bool with_names, Viewer*);
  //! Contains all the programs for the item rendering.
  static std::vector<QOpenGLShaderProgram*> shader_programs;
  QMatrix4x4 projectionMatrix;
  void sendSnapshotToClipboard(Viewer*);
  std::vector<QOpenGLShaderProgram*>& shaderPrograms()
  {
    return shader_programs;
  }

#ifdef CGAL_USE_WEBSOCKETS
  QWebSocket m_webSocket;
#endif
  bool is_connected;
  QString session;
  QUrl m_url;
};

class LightingDialog :
    public QDialog,
    public Ui::LightingDialog
{
  Q_OBJECT
public:
  QColor ambient, diffuse, specular;
  LightingDialog(Viewer_impl* d)
  {
    setupUi(this);
    position_lineEdit->setText(QString("%1,%2,%3")
                               .arg(d->position.x())
                               .arg(d->position.y())
                               .arg(d->position.z()));
    QPalette palette;
    ambient=QColor::fromRgbF(d->ambient.x(),
                             d->ambient.y(),
                             d->ambient.z());
    palette.setColor(QPalette::Button,ambient);
    ambientButton->setPalette(palette);
    ambientButton->setStyle(QStyleFactory::create("Fusion"));

    diffuse=QColor::fromRgbF(d->diffuse.x(),
                             d->diffuse.y(),
                             d->diffuse.z());
    palette.setColor(QPalette::Button,diffuse);
    diffuseButton->setPalette(palette);
    diffuseButton->setStyle(QStyleFactory::create("Fusion"));

    specular=QColor::fromRgbF(d->specular.x(),
                              d->specular.y(),
                              d->specular.z());
    palette.setColor(QPalette::Button,specular);
    specularButton->setPalette(palette);
    specularButton->setStyle(QStyleFactory::create("Fusion"));
    spec_powrSlider->setValue(static_cast<int>(d->spec_power));

    connect(&ambient_dial, &QColorDialog::currentColorChanged, this, &LightingDialog::ambient_changed );
    connect(&diffuse_dial, &QColorDialog::currentColorChanged, this, &LightingDialog::diffuse_changed );
    connect(&spec_dial, &QColorDialog::currentColorChanged, this,    &LightingDialog::specular_changed);

    connect(ambientButton, &QPushButton::clicked,
            [this](){
      ambient_dial.setCurrentColor(ambient);
      ambient_dial.exec();
      ambient = ambient_dial.selectedColor();
      QPalette palette;
      palette.setColor(QPalette::Button, ambient);
      ambientButton->setPalette(palette);
    });
    connect(diffuseButton, &QPushButton::clicked,
            [this](){
      diffuse_dial.setCurrentColor(diffuse);
      diffuse_dial.exec();
      diffuse = diffuse_dial.selectedColor();
      QPalette palette;
      palette.setColor(QPalette::Button, diffuse);
      diffuseButton->setPalette(palette);
    });
    connect(specularButton, &QPushButton::clicked,
            [this](){
      spec_dial.setCurrentColor(specular);
      spec_dial.exec();
      specular = spec_dial.selectedColor();
      QPalette palette;
      palette.setColor(QPalette::Button, specular);
      specularButton->setPalette(palette);
    });

    //D e f a u l t - S e t t i n g s
    connect(buttonBox->button(QDialogButtonBox::StandardButton::RestoreDefaults), &QPushButton::clicked,
            [this](){
      position_lineEdit->setText(QString("0,0,1"));
      ambient=QColor(77,77,77);
      diffuse=QColor(204,204,204);
      specular=QColor(0,0,0);
      spec_powrSlider->setValue(51);
      QPalette palette;
      palette.setColor(QPalette::Button, ambient);
      ambientButton->setPalette(palette);
      palette.setColor(QPalette::Button, diffuse);
      diffuseButton->setPalette(palette);
      palette.setColor(QPalette::Button, specular);
      specularButton->setPalette(palette);
    });
  }
private Q_SLOTS:
  void diffuse_changed()
  {
    diffuse = diffuse_dial.currentColor();
    s_diffuse_changed();
  }
  void ambient_changed()
  {
    ambient = ambient_dial.currentColor();
    s_ambient_changed();
  }
  void specular_changed()
  {
    specular = spec_dial.currentColor();
    s_specular_changed();
  }
Q_SIGNALS:
  void s_diffuse_changed();
  void s_ambient_changed();
  void s_specular_changed();
private:
  QColorDialog diffuse_dial;
  QColorDialog ambient_dial;
  QColorDialog spec_dial;
};

std::vector<QOpenGLShaderProgram*> Viewer_impl::shader_programs =
    std::vector<QOpenGLShaderProgram*>(Viewer::NB_OF_PROGRAMS);
void Viewer::doBindings()
{
  QSettings viewer_settings;
  // enable anti-aliasing
  QString cam_pos = viewer_settings.value("cam_pos", QString("0.0,0.0,1.0")).toString();
  d->position = QVector4D(cam_pos.split(",").at(0).toFloat(),
                          cam_pos.split(",").at(1).toFloat(),
                          cam_pos.split(",").at(2).toFloat(),
                          1.0f);

  QString ambient = viewer_settings.value("ambient", QString("0.4,0.4,0.4")).toString();
  d->ambient = QVector4D(ambient.split(",").at(0).toFloat(),
                         ambient.split(",").at(1).toFloat(),
                         ambient.split(",").at(2).toFloat(),
                         1.0f);

  QString diffuse = viewer_settings.value("diffuse", QString("1.0,1.0,1.0")).toString();
  d->diffuse = QVector4D(diffuse.split(",").at(0).toFloat(),
                         diffuse.split(",").at(1).toFloat(),
                         diffuse.split(",").at(2).toFloat(),
                         1.0f);

  QString specular = viewer_settings.value("specular", QString("0.0,0.0,0.0")).toString();
  d->specular = QVector4D(specular.split(",").at(0).toFloat(),
                          specular.split(",").at(1).toFloat(),
                          specular.split(",").at(2).toFloat(),
                          1.0f);

  QString front_color = viewer_settings.value("front_color", QString("1.0,0.0,0.0")).toString();
  d->front_color= QColor::fromRgbF(front_color.split(",").at(0).toFloat(),
                                   front_color.split(",").at(1).toFloat(),
                                   front_color.split(",").at(2).toFloat(),
                         1.0f);
  QString back_color = viewer_settings.value("back_color", QString("0.0,0.0,1.0")).toString();
  d->back_color= QColor::fromRgbF( back_color.split(",").at(0).toFloat(),
                                   back_color.split(",").at(1).toFloat(),
                                   back_color.split(",").at(2).toFloat(),
                         1.0f);
  d->spec_power = viewer_settings.value("spec_power", 51.8).toFloat();
  d->scene = nullptr;
  d->projection_is_ortho = false;
  d->cam_sharing = false;
  d->twosides = false;
  this->setProperty("draw_two_sides", false);
  this->setProperty("back_front_shading", false);
  d->macro_mode = false;
  d->inFastDrawing = true;
  d->inDrawWithNames = false;
  d->clipping = false;
  d->shader_programs.resize(NB_OF_PROGRAMS);
  d->textRenderer = new TextRenderer();
  d->is_2d_selection_mode = false;
  d->is_connected = false;
  d->scene_scaling = false;
  d->scaler = QVector3D(1,1,1);

  connect( d->textRenderer, SIGNAL(sendMessage(QString,int)),
           this, SLOT(printMessage(QString,int)) );
  connect(&d->messageTimer, SIGNAL(timeout()), SLOT(hideMessage()));
  setShortcut(CGAL::qglviewer::EXIT_VIEWER, 0);
  setKeyDescription(Qt::Key_T,
                    tr("Turn the camera by 180 degrees"));
  setKeyDescription(Qt::Key_M,
                    tr("Toggle macro mode: useful to view details very near from the camera, "
                       "but decrease the z-buffer precision"));
  setKeyDescription(Qt::Key_I + Qt::CTRL,
                      tr("Toggle the primitive IDs visibility of the selected Item, for the types selected in the context menu of the said item."));
  setKeyDescription(Qt::Key_D,
                      tr("Disable the distance between two points  visibility."));
  setKeyDescription(Qt::Key_F5,
                    tr("Reload selected items if possible."));

  //modify mouse bindings that have been updated
  setMouseBinding(Qt::Key(0), Qt::NoModifier, Qt::LeftButton, CGAL::qglviewer::RAP_FROM_PIXEL, true, Qt::RightButton);
  setMouseBinding(Qt::ShiftModifier, Qt::RightButton, CGAL::qglviewer::NO_CLICK_ACTION, false, Qt::NoButton);
  setMouseBindingDescription(Qt::ShiftModifier, Qt::RightButton,
                             tr("Select and pop context menu"));
  setMouseBinding(Qt::Key_R, Qt::NoModifier, Qt::LeftButton, CGAL::qglviewer::RAP_FROM_PIXEL);

  //use the new API for these
  setMouseBinding(Qt::ShiftModifier, Qt::LeftButton, CGAL::qglviewer::SELECT);

  setMouseBindingDescription(Qt::Key_I, Qt::NoModifier, Qt::LeftButton,
                             tr("Show/hide the primitive ID of the types selected in the context menu of the picked item."));
  setMouseBindingDescription(Qt::Key_D, Qt::NoModifier, Qt::LeftButton,
                             tr("Selects a point. When the second point is selected,  "
                                "displays the two points and the distance between them."));
  setMouseBindingDescription(Qt::Key_O, Qt::NoModifier, Qt::LeftButton,
                             tr("Move the camera orthogonally to the picked facet of a Scene_surface_mesh_item or "
                                "to the current selection of a Scene_points_with_normal_item."));
  setKeyDescription(Qt::Key_F5,
                    tr("Reloads the selected item if possible."));
  setKeyDescription(Qt::Key_F11,
                    tr("Toggle the viewer's fullscreen mode."));

  prev_radius = sceneRadius();
  d->has_text = false;
  d->i_is_pressed = false;
  d->z_is_pressed = false;
  d->distance_is_displayed = false;
  d->is_d_pressed = false;
  d->viewer = this;
  setTextIsEnabled(true);
}

Viewer::Viewer(QWidget* parent, bool antialiasing)
  : CGAL::Three::Viewer_interface(parent)
{
  d = new Viewer_impl;
  d->antialiasing = antialiasing;
  doBindings();
}

Viewer::Viewer(QWidget* parent,
               Viewer* sharedWidget,
               bool antialiasing)
  : CGAL::Three::Viewer_interface(parent, sharedWidget)
{
  d = new Viewer_impl;
  d->viewer = this;
  d->shareViewer = sharedWidget;
  is_sharing = true;
  d->antialiasing = antialiasing;
  this->setProperty("draw_two_sides", false);
  this->setProperty("back_front_shading", false);
  this->setProperty("helpText", QString("This is a sub-viewer. It displays the scene "
                                        "from another point of view. \n "));
  is_ogl_4_3 = sharedWidget->is_ogl_4_3;
  d->_recentFunctions = sharedWidget->d->_recentFunctions;
  doBindings();
  d->total_pass = sharedWidget->total_pass();
  setOffset(sharedWidget->offset());
}

Viewer::~Viewer()
{
  makeCurrent();
    QSettings viewer_settings;
    viewer_settings.setValue("cam_pos",
                             QString("%1,%2,%3")
                             .arg(d->position.x())
                             .arg(d->position.y())
                             .arg(d->position.z()));
    viewer_settings.setValue("ambient",
                             QString("%1,%2,%3")
                             .arg(d->ambient.x())
                             .arg(d->ambient.y())
                             .arg(d->ambient.z()));
    viewer_settings.setValue("diffuse",
                             QString("%1,%2,%3")
                             .arg(d->diffuse.x())
                             .arg(d->diffuse.y())
                             .arg(d->diffuse.z()));
    viewer_settings.setValue("specular",
                             QString("%1,%2,%3")
                             .arg(d->specular.x())
                             .arg(d->specular.y())
                             .arg(d->specular.z()));
    viewer_settings.setValue("spec_power",
                             d->spec_power);
    viewer_settings.setValue("front_color",
                             QString("%1,%2,%3")
                             .arg(d->front_color.redF())
                             .arg(d->front_color.greenF())
                             .arg(d->front_color.blueF()));
    viewer_settings.setValue("back_color",
                             QString("%1,%2,%3")
                             .arg(d->back_color.redF())
                             .arg(d->back_color.greenF())
                             .arg(d->back_color.blueF()));
    makeCurrent();
    d->vao.destroy();
    if(d->_recentFunctions)
      delete d->_recentFunctions;
    if(d->painter)
      delete d->painter;
    if(d->textRenderer)
      d->textRenderer->deleteLater();
  delete d;

}

void Viewer::setScene(CGAL::Three::Scene_draw_interface* scene)
{
  d->scene = scene;
}

bool Viewer::antiAliasing() const
{
  return d->antialiasing;
}

void Viewer::setAntiAliasing(bool b)
{
  d->antialiasing = b;
  update();
}

void Viewer::setTwoSides(bool b)
{
  this->setProperty("draw_two_sides", b);
  d->twosides = b;
  update();
}


void Viewer::setBackFrontShading(bool b)
{
  this->setProperty("back_front_shading", b);
  update();
}


void Viewer::setFastDrawing(bool b)
{
  d->inFastDrawing = b;
  update();
}

bool Viewer::inFastDrawing() const
{
  return (d->inFastDrawing
          && (camera()->frame()->isSpinning()
              || camera()->frame()->isManipulated()));
}

void Viewer::draw()
{
  glEnable(GL_DEPTH_TEST);
  d->draw_aux(false, this);
}

void Viewer::fastDraw()
{
  d->draw_aux(false, this);
}

void Viewer::init()
{
  if(!isOpenGL_4_3())
  {
    std::cerr<<"The openGL context initialization failed "
    "and the default context (2.0 ES) will be used. \n"
    " This means, among other things, that no widelines can be displayed,"
    " which makes selected edges harder to see." <<std::endl;
  }
  else
  {
    d->_recentFunctions = new QOpenGLFunctions_4_3_Core();
    d->_recentFunctions->initializeOpenGLFunctions();
  }
  d->logger = new QOpenGLDebugLogger(this);
  if(!d->logger->initialize())
    qDebug()<<"logger could not init.";
  else{
    connect(d->logger, SIGNAL(messageLogged(QOpenGLDebugMessage)), this, SLOT(messageLogged(QOpenGLDebugMessage)));
    d->logger->startLogging();
  }
  glDrawArraysInstanced = (PFNGLDRAWARRAYSINSTANCEDARBPROC)this->context()->getProcAddress("glDrawArraysInstancedARB");
  if(!glDrawArraysInstanced)
  {
      qDebug()<<"glDrawArraysInstancedARB : extension not found. Spheres will be displayed as points.";
      d->extension_is_found = false;
  }
  else
      d->extension_is_found = true;

  glVertexAttribDivisor = (PFNGLVERTEXATTRIBDIVISORARBPROC)this->context()->getProcAddress("glVertexAttribDivisorARB");
  if(!glDrawArraysInstanced)
  {
      qDebug()<<"glVertexAttribDivisorARB : extension not found. Spheres will be displayed as points.";
      d->extension_is_found = false;
  }
  else
      d->extension_is_found = true;
  QSettings settings;
  QString colorname = settings.value("background_color", "#ffffff").toString();
  QColor bc(colorname);
  setBackgroundColor(bc);
  d->vao.create();
  d->buffer.create();

  //setting the program used for the distance
  if(!is_linked)
  {
    //Vertex source code
    const char vertex_source_dist[] =
    {
      "#version 150  \n"
      "in vec4 vertex;\n"
      "uniform mat4 mvp_matrix;\n"
      "uniform float point_size;\n"
      "void main(void)\n"
      "{\n"
      "   gl_PointSize = point_size; \n"
      "   gl_Position = mvp_matrix * vertex; \n"
      "} \n"
      "\n"
    };
    const char vertex_source_comp_dist[] =
    {
      "attribute highp vec4 vertex;\n"
      "uniform highp mat4 mvp_matrix;\n"
      "uniform highp float point_size;\n"
      "void main(void)\n"
      "{\n"
      "   gl_PointSize = point_size; \n"
      "   gl_Position = mvp_matrix * vertex; \n"
      "} \n"
      "\n"
    };
    //Fragment source code
    const char fragment_source_dist[] =
    {
      "#version 150  \n"
      "out vec4 out_color; \n"
      "void main(void) { \n"
      "out_color = vec4(0.0,0.0,0.0,1.0); \n"
      "} \n"
      "\n"
    };
    const char fragment_source_comp_dist[] =
    {
      "void main(void) { \n"
      "gl_FragColor = vec4(0.0,0.0,0.0,1.0); \n"
      "} \n"
      "\n"
    };
    QOpenGLShader vertex_shader(QOpenGLShader::Vertex);
    QOpenGLShader fragment_shader(QOpenGLShader::Fragment);
    if(isOpenGL_4_3())
    {
      if(!vertex_shader.compileSourceCode(vertex_source_dist))
      {
        std::cerr<<"Compiling vertex source FAILED"<<std::endl;
      }

      if(!fragment_shader.compileSourceCode(fragment_source_dist))
      {
        std::cerr<<"Compiling fragmentsource FAILED"<<std::endl;
      }
    }
    else
    {
      if(!vertex_shader.compileSourceCode(vertex_source_comp_dist))
      {
        std::cerr<<"Compiling vertex source FAILED"<<std::endl;
      }

      if(!fragment_shader.compileSourceCode(fragment_source_comp_dist))
      {
        std::cerr<<"Compiling fragmentsource FAILED"<<std::endl;
      }
    }
    if(!d->rendering_program_dist.addShader(&vertex_shader))
    {
      std::cerr<<"adding vertex shader FAILED"<<std::endl;
    }
    if(!d->rendering_program_dist.addShader(&fragment_shader))
    {
      std::cerr<<"adding fragment shader FAILED"<<std::endl;
    }
    if(!d->rendering_program_dist.link())
    {
      qDebug() << d->rendering_program_dist.log();
    }
  }
  d->painter = new QPainter();
}

#include <QMouseEvent>

void Viewer::mousePressEvent(QMouseEvent* event)
{
  makeCurrent();
  if(event->button() == Qt::RightButton &&
     event->modifiers().testFlag(Qt::ShiftModifier))
  {
    select(event->pos());
    requestContextMenu(event->globalPos());
    event->accept();
  }
  else if(!event->modifiers()
          && event->button() == Qt::LeftButton
          && d->i_is_pressed)
  {
      d->scene->printPrimitiveId(event->pos(), this);
  }
  else if(!event->modifiers()
          && event->button() == Qt::LeftButton
          && d->z_is_pressed)
  {
      d->scene->zoomToPosition(event->pos(), this);
  }
  else if(!event->modifiers()
          && event->button() == Qt::LeftButton
          && d->is_d_pressed)
  {
      d->showDistance(event->pos());
      event->accept();
  }
  else{
    makeCurrent();
    CGAL::QGLViewer::mousePressEvent(event);
  }
}
void Viewer::mouseDoubleClickEvent(QMouseEvent* event)
{
  makeCurrent();
  CGAL::QGLViewer::mouseDoubleClickEvent(event);
}

#include <QContextMenuEvent>
void Viewer::contextMenuEvent(QContextMenuEvent* event)
{
  if(event->reason() != QContextMenuEvent::Mouse) {
    requestContextMenu(event->globalPos());
    event->accept();
  }
  else {
    CGAL::QGLViewer::contextMenuEvent(event);
  }
}

void Viewer::keyPressEvent(QKeyEvent* e)
{
  if(!e->modifiers()) {
    if(e->key() == Qt::Key_T) {
      turnCameraBy180Degres();
      return;
    }
    else if(e->key() == Qt::Key_M) {
      d->macro_mode = ! d->macro_mode;
      switch(camera()->type()){
      case CGAL::qglviewer::Camera::PERSPECTIVE:
        if(d->macro_mode) {
          camera()->setZNearCoefficient(0.0005f);
        } else {
          camera()->setZNearCoefficient(0.005f);
        }
        break;
        case CGAL::qglviewer::Camera::ORTHOGRAPHIC:
        if(d->macro_mode) {
          camera()->setOrthoZNear(-0.5f);
        } else {
          camera()->setOrthoZNear(0.0f);
        }
        break;
        default:
        break;
      }
      this->displayMessage(tr("Macro mode: %1").
                           arg(d->macro_mode ? tr("on") : tr("off")));



      return;
    }
    else if(e->key() == Qt::Key_I) {
          d->i_is_pressed = true;
        }
    else if(e->key() == Qt::Key_O) {
          d->z_is_pressed = true;
        }
    else if(e->key() == Qt::Key_D) {
        if(e->isAutoRepeat())
        {
            return;
        }
        if(!d->is_d_pressed)
        {
            d->clearDistancedisplay();
        }
        d->is_d_pressed = true;
        update();
        return;
    }
  }
  else if(e->key() == Qt::Key_I && e->modifiers() & Qt::ControlModifier){
    d->scene->printAllIds();
    update();
    return;
  }

  else if(e->key() == Qt::Key_C && e->modifiers() & Qt::ControlModifier){
    d->sendSnapshotToClipboard(this);
    return;
  }

  else if(e->key() == Qt::Key_S && e->modifiers() & Qt::ControlModifier){
    this->saveSnapshot();
    return;
  }

  //forward the event to the scene (item handling of the event)
  if (! d->scene->keyPressEvent(e) )
    CGAL::QGLViewer::keyPressEvent(e);
}

void Viewer::keyReleaseEvent(QKeyEvent *e)
{
  if(e->key() == Qt::Key_I) {
    d->i_is_pressed = false;
  }
  else if(e->key() == Qt::Key_O) {
    d->z_is_pressed = false;
  }
  else if(!e->modifiers() && e->key() == Qt::Key_D)
  {
    if(e->isAutoRepeat())
    {
      return;
    }
    d->is_d_pressed = false;
  }
  CGAL::QGLViewer::keyReleaseEvent(e);
}

void Viewer::turnCameraBy180Degres() {
  CGAL::qglviewer::Camera* camera = this->camera();
  using CGAL::qglviewer::ManipulatedCameraFrame;

  ManipulatedCameraFrame frame_from(*camera->frame());
  camera->setViewDirection(-camera->viewDirection());
  ManipulatedCameraFrame frame_to(*camera->frame());

  camera->setOrientation(frame_from.orientation());
  camera->interpolateTo(frame_to, 0.5f);
}

void Viewer_impl::draw_aux(bool with_names, Viewer* viewer)
{
  if(scene == nullptr)
    return;
  current_total_pass = viewer->inFastDrawing() ? total_pass/2 : total_pass;
  viewer->setGlPointSize(2.f);
  viewer->glEnable(GL_POLYGON_OFFSET_FILL);
  viewer->glPolygonOffset(1.0f,1.0f);

  if(!with_names && antialiasing)
  {
    viewer->glEnable(GL_BLEND);
    viewer->glEnable(GL_LINE_SMOOTH);
    viewer->glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
    //viewer->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    viewer->glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
  }
  else
  {
    viewer->glDisable(GL_BLEND);
    viewer->glDisable(GL_LINE_SMOOTH);
    viewer->glHint(GL_LINE_SMOOTH_HINT, GL_FASTEST);
    //viewer->glBlendFunc(GL_ONE, GL_ZERO);
    viewer->glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
  }
  inDrawWithNames = with_names;
  if(with_names)
    scene->drawWithNames(viewer);
  else
    scene->draw(viewer);
  viewer->glDisable(GL_POLYGON_OFFSET_FILL);
}

bool Viewer::inDrawWithNames() const {
  return d->inDrawWithNames;
}

void Viewer::drawWithNames()
{
  CGAL::QGLViewer::draw();
  d->draw_aux(true, this);
}

void Viewer::postSelection(const QPoint& pixel)
{
  Q_EMIT selected(this->selectedName());
  CGAL::qglviewer::Vec point;
  bool found = true;
  if(property("picked_point").isValid()) {
    if(!property("picked_point").toList().isEmpty())
    {
      QList<QVariant> picked_point = property("picked_point").toList();
      point = CGAL::qglviewer::Vec (picked_point[0].toDouble(),
          picked_point[1].toDouble(),
          picked_point[2].toDouble());
    }
    else{
      found = false;
    }
  }
  else{
    point = camera()->pointUnderPixel(pixel, found) - offset();
  }
  if(found) {
    QVector3D transformed_point(point.x,
                                point.y,
                                point.z);
    if(d->scene_scaling)
    {
      transformed_point = QVector3D(
            point.x+offset().x,
            point.y+offset().y,
            point.z+offset().z);
      transformed_point = transformed_point/d->scaler;
      transformed_point[0] -=offset().x ;
      transformed_point[1] -=offset().y ;
      transformed_point[2] -=offset().z ;
    }
    Q_EMIT selectedPoint(transformed_point.x(),
                         transformed_point.y(),
                         transformed_point.z());
    CGAL::qglviewer::Vec dir;
    CGAL::qglviewer::Vec orig;
    if(d->projection_is_ortho)
    {
      dir = camera()->viewDirection();
      orig = point;
    }
    else{
      orig = camera()->position() - offset();
      dir = point - orig;
    }
    this->setProperty("performing_selection", true);
    Q_EMIT selectionRay(orig.x, orig.y, orig.z,
                        dir.x, dir.y, dir.z);
    this->setProperty("performing_selection", false);
  }
}
bool CGAL::Three::Viewer_interface::readFrame(QString s, CGAL::qglviewer::Frame& frame)
{
  QStringList list = s.split(" ", CGAL_QT_SKIP_EMPTY_PARTS);
  if(list.size() != 7)
    return false;
  float vec[3];
  for(int i = 0; i < 3; ++i)
  {
    bool ok;
    vec[i] = list[i].toFloat(&ok);
    if(!ok) return false;
  }
  double orient[4];
  for(int i = 0; i < 4; ++i)
  {
    bool ok;
    orient[i] = list[i + 3].toDouble(&ok);
    if(!ok) return false;
  }
  frame.setPosition(CGAL::qglviewer::Vec(vec[0],
                                   vec[1],
                                   vec[2]));
  frame.setOrientation(orient[0],
                       orient[1],
                       orient[2],
                       orient[3]);
  return true;
}

QString CGAL::Three::Viewer_interface::dumpFrame(const CGAL::qglviewer::Frame& frame) {
  const CGAL::qglviewer::Vec pos = frame.position();
  const CGAL::qglviewer::Quaternion q = frame.orientation();

  return QString("%1 %2 %3 %4 %5 %6 %7")
    .arg(pos[0])
    .arg(pos[1])
    .arg(pos[2])
    .arg(q[0])
    .arg(q[1])
    .arg(q[2])
    .arg(q[3]);
}

bool Viewer::moveCameraToCoordinates(QString s, float animation_duration) {
  CGAL::qglviewer::Frame new_frame;
  if(readFrame(s, new_frame)) {
    camera()->interpolateTo(new_frame, animation_duration);
    return true;
  }
  else
    return false;
}

QString Viewer::dumpCameraCoordinates()
{
  if(camera()->frame()) {
    return dumpFrame(*camera()->frame());
  } else {
    return QString();
  }
}

void Viewer::attribBuffers(int program_name) const {
    //ModelViewMatrix used for the transformation of the camera.
    QMatrix4x4 mvp_mat;
    // ModelView Matrix used for the lighting system
    QMatrix4x4 mv_mat;
    // transformation of the manipulated frame
    QMatrix4x4 f_mat;
    // ModelView Matrix that is modified just for the normal matrix in case of scene scaling
    QMatrix4x4 norm_mat;

    f_mat.setToIdentity();
    //fills the MVP and MV matrices.
    GLdouble d_mat[16];
    this->camera()->getModelViewMatrix(d_mat);
    for (int i=0; i<16; ++i)
        mv_mat.data()[i] = GLfloat(d_mat[i]);
    this->camera()->getModelViewProjectionMatrix(d_mat);
    for (int i=0; i<16; ++i)
        mvp_mat.data()[i] = GLfloat(d_mat[i]);

    norm_mat = mv_mat;

    if(d->scene_scaling){
      mvp_mat.scale(d->scaler);
      mv_mat.scale(d->scaler);
      QVector3D scale_norm(1.0/d->scaler.x(), 1.0/d->scaler.y(), 1.0/d->scaler.z());
      norm_mat.scale(scale_norm);
    }

    QOpenGLShaderProgram* program = getShaderProgram(program_name);
    program->bind();
    program->setUniformValue("point_size", getGlPointSize());
    program->setUniformValue("mvp_matrix", mvp_mat);
    QMatrix4x4 id_mat;
    id_mat.setToIdentity();
    program->setUniformValue("f_matrix", id_mat);
    program->setUniformValue("is_clipbox_on", d->clipping);
    if(d->clipping)
    {
      QMatrix4x4 clipbox1;
      QMatrix4x4 clipbox2;
      for(int i=0;i<12;++i)
      {
        clipbox1.data()[i]=d->clipbox[i/4][i%4];
        clipbox2.data()[i]=d->clipbox[(i+12)/4][(i+12)%4];
      }
      program->setUniformValue("clipbox1", clipbox1);
      program->setUniformValue("clipbox2", clipbox2);
    }
    QVector4D light_pos(d->position.x(),
                        d->position.y(),
                        d->position.z(),
                        1.0f);
    switch(program_name)
    {
    case PROGRAM_WITH_LIGHT:
    case PROGRAM_SPHERES:
    case PROGRAM_CUTPLANE_SPHERES:
    case PROGRAM_NO_SELECTION:
    case PROGRAM_HEAT_INTENSITY:
      program->setUniformValue("alpha", 1.0f); //overriden in item draw() if necessary
    default:
      break;
    }
    switch(program_name)
    {
    case PROGRAM_SPHERES:
    case PROGRAM_DARK_SPHERES:
    case PROGRAM_WITH_LIGHT:
    case PROGRAM_OLD_FLAT:
      program->setUniformValue("f_matrix",f_mat);
    default:
      break;
    }

    switch(program_name)
    {
    case PROGRAM_WITH_LIGHT:
    case PROGRAM_C3T3:
    case PROGRAM_PLANE_TWO_FACES:
    case PROGRAM_INSTANCED:
    case PROGRAM_WITH_TEXTURE:
    case PROGRAM_CUTPLANE_SPHERES:
    case PROGRAM_SPHERES:
    case PROGRAM_OLD_FLAT:
    case PROGRAM_FLAT:
    case PROGRAM_NO_INTERPOLATION:
    case PROGRAM_HEAT_INTENSITY:
        program->setUniformValue("light_pos", light_pos);
        program->setUniformValue("light_diff",d->diffuse);
        program->setUniformValue("light_spec", d->specular);
        program->setUniformValue("light_amb", d->ambient);
        program->setUniformValue("spec_power", d->spec_power);
        program->setUniformValue("front_color", d->front_color);
        program->setUniformValue("back_color", d->back_color);
        program->setUniformValue("is_two_side", d->twosides);
        program->setUniformValue("back_front_shading", this->property("back_front_shading").toBool());
        break;
    }
    switch(program_name)
    {
    case PROGRAM_WITH_LIGHT:
    case PROGRAM_C3T3:
    case PROGRAM_PLANE_TWO_FACES:
    case PROGRAM_INSTANCED:
    case PROGRAM_CUTPLANE_SPHERES:
    case PROGRAM_SPHERES:
    case PROGRAM_OLD_FLAT:
    case PROGRAM_FLAT:
    case PROGRAM_NO_INTERPOLATION:
    case PROGRAM_HEAT_INTENSITY:
      program->setUniformValue("mv_matrix", mv_mat);
      program->setUniformValue("norm_matrix", norm_mat);
      break;
    case PROGRAM_WITHOUT_LIGHT:
    case PROGRAM_SOLID_WIREFRAME:
      break;
    case PROGRAM_WITH_TEXTURE:
      program->setUniformValue("mv_matrix", mv_mat);
      program->setUniformValue("norm_matrix", norm_mat);
      program->setUniformValue("s_texture",0);
      program->setUniformValue("f_matrix",f_mat);
      break;
    case PROGRAM_WITH_TEXTURED_EDGES:
        program->setUniformValue("s_texture",0);
        break;
    case PROGRAM_NO_SELECTION:
        program->setUniformValue("f_matrix",f_mat);
        break;
    }
    program->release();
}

void Viewer::beginSelection(const QPoint &point)
{
  CGAL::QGLViewer::beginSelection(point);
  d->scene->setPickedPixel(point);
}
void Viewer::endSelection(const QPoint& point)
{
  CGAL::QGLViewer::endSelection(point);
    //redraw the true scene for the glReadPixel in postSelection();
    d->draw_aux(false, this);
}

void Viewer::drawVisualHints()
{

    CGAL::QGLViewer::drawVisualHints();

    if(d->distance_is_displayed)
    {
        glDisable(GL_DEPTH_TEST);
        QMatrix4x4 mvpMatrix;
        double mat[16];
        camera()->getModelViewProjectionMatrix(mat);
        for(int i=0; i < 16; i++)
        {
          mvpMatrix.data()[i] = (float)mat[i];
        }
        if(!isOpenGL_4_3())
        {
          //draws the distance
          //nullifies the translation
          d->rendering_program_dist.bind();
          d->rendering_program_dist.setUniformValue("mvp_matrix", mvpMatrix);
          d->rendering_program_dist.setUniformValue("point_size", GLfloat(6.0f));
          d->vao.bind();
          glDrawArrays(GL_POINTS, 0, static_cast<GLsizei>(2));
          glDrawArrays(GL_LINES, 0, static_cast<GLsizei>(2));
          d->vao.release();
          d->rendering_program_dist.release();
          glEnable(GL_DEPTH_TEST);
        }
        else
        {
          QOpenGLShaderProgram* program = getShaderProgram(PROGRAM_SOLID_WIREFRAME);
          program->bind();
          QVector2D vp(width(), height());
          program->setUniformValue("viewport", vp);
          program->setUniformValue("near",(GLfloat)camera()->zNear());
          program->setUniformValue("far",(GLfloat)camera()->zFar());
          program->setUniformValue("width", GLfloat(3.0f));
          program->setAttributeValue("colors", QColor(Qt::black));
          program->setUniformValue("mvp_matrix", mvpMatrix);
          QMatrix4x4 f_mat;
          f_mat.setToIdentity();
          program->setUniformValue("f_matrix", f_mat);
          d->vao.bind();
          glDrawArrays(GL_LINES, 0, static_cast<GLsizei>(2));
          d->vao.release();
          program->release();

          program = getShaderProgram(PROGRAM_NO_SELECTION);
          program->bind();
          program->setAttributeValue("colors", QColor(Qt::black));
          program->setAttributeValue("point_size", 6.0f);
          program->setUniformValue("mvp_matrix", mvpMatrix);
          program->setUniformValue("f_matrix", f_mat);
          d->vao.bind();
          glDrawArrays(GL_POINTS, 0, static_cast<GLsizei>(2));
          d->vao.release();
          program->release();
        }

    }
    if (!d->painter->isActive())
      d->painter->begin(this);
    //So that the text is drawn in front of everything
    d->painter->beginNativePainting();
    glDisable(GL_DEPTH_TEST);
    d->painter->endNativePainting();
    //Prints the displayMessage
    QFont font = QFont();
    QFontMetrics fm(font);
    TextItem *message_text = new TextItem(float(10 +
                                            #if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
                                                   fm.horizontalAdvance(d->message)/2)
                                            #else
                                                   fm.width(d->message)/2)
                                            #endif
                                          ,
                                          float(height()-20),
                                          0, d->message, false,
                                          QFont(), Qt::gray );
    if (d->_displayMessage)
    {
      d->textRenderer->addText(message_text);
    }
    d->textRenderer->draw(this, d->scaler);

    if (d->_displayMessage)
      d->textRenderer->removeText(message_text);
    delete message_text;
}

QOpenGLShaderProgram* Viewer::declare_program(int name,
                                      const char* v_shader,
                                      const char* f_shader) const
{
  // workaround constness issues in Qt
  Viewer* viewer = const_cast<Viewer*>(this);

  if(d->shader_programs[name])
  {
    return d->shader_programs[name];
  }

  else
  {

    QOpenGLShaderProgram *program = new QOpenGLShaderProgram(viewer);
    if(!program->addShaderFromSourceFile(QOpenGLShader::Vertex,v_shader))
    {
      std::cerr<<"adding vertex shader FAILED"<<std::endl;
    }
    if(!program->addShaderFromSourceFile(QOpenGLShader::Fragment,f_shader))
    {
      std::cerr<<"adding fragment shader FAILED"<<std::endl;
    }
    if(isOpenGL_4_3())
    {
      if(strcmp(f_shader,":/cgal/Polyhedron_3/resources/shader_flat.frag" ) == 0)
      {
        if(!program->addShaderFromSourceFile(QOpenGLShader::Geometry,":/cgal/Polyhedron_3/resources/shader_flat.geom" ))
        {
          std::cerr<<"adding geometry shader FAILED"<<std::endl;
        }
      }
      if(strcmp(f_shader,":/cgal/Polyhedron_3/resources/solid_wireframe_shader.frag" ) == 0)
      {
        if(!program->addShaderFromSourceFile(QOpenGLShader::Geometry,":/cgal/Polyhedron_3/resources/solid_wireframe_shader.geom" ))
        {
          std::cerr<<"adding geometry shader FAILED"<<std::endl;
        }
      }
      if(strcmp(f_shader,":/cgal/Polyhedron_3/resources/no_interpolation_shader.frag" ) == 0)
      {
        if(!program->addShaderFromSourceFile(QOpenGLShader::Geometry,":/cgal/Polyhedron_3/resources/no_interpolation_shader.geom" ))
        {
          std::cerr<<"adding geometry shader FAILED"<<std::endl;
        }
      }
    }
    program->bindAttributeLocation("colors", 1);
    program->link();
    d->shader_programs[name] = program;
    return program;
  }
}
QOpenGLShaderProgram* Viewer::getShaderProgram(int name) const
{
  switch(name)
  {
  case PROGRAM_C3T3:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_c3t3.vert" , ":/cgal/Polyhedron_3/resources/shader_c3t3.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_c3t3.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_c3t3.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("hasCutPlane", true);
    program->setProperty("hasTransparency", true);
    program->setProperty("hasCenter", true);
    program->setProperty("hasSurfaceMode", true);
    return program;
  }
  case PROGRAM_C3T3_EDGES:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_c3t3_edges.vert" , ":/cgal/Polyhedron_3/resources/shader_c3t3_edges.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_c3t3_edges.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_c3t3_edges.frag");
    program->setProperty("hasCutPlane", true);
    program->setProperty("hasSurfaceMode", true);
    return program;
  }
  case PROGRAM_WITH_LIGHT:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_with_light.vert" , ":/cgal/Polyhedron_3/resources/shader_with_light.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_light.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_light.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("hasTransparency", true);
    program->setProperty("hasFMatrix", true);
    return program;
  }
  case PROGRAM_HEAT_INTENSITY:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/heat_intensity_shader.vert" , ":/cgal/Polyhedron_3/resources/heat_intensity_shader.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/heat_intensity_shader.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/heat_intensity_shader.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("hasTransparency", true);
    program->setProperty("hasDistanceValues", true);
    return program;
  }
  case PROGRAM_WITHOUT_LIGHT:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_without_light.vert" , ":/cgal/Polyhedron_3/resources/shader_without_light.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_without_light.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_without_light.frag");
    program->setProperty("hasFMatrix", true);
    return program;
  }
  case PROGRAM_NO_SELECTION:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_without_light.vert" , ":/cgal/Polyhedron_3/resources/shader_no_light_no_selection.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_without_light.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_no_light_no_selection.frag");
    program->setProperty("hasFMatrix", true);
    program->setProperty("hasTransparency", true);
    return program;
  }
  case PROGRAM_WITH_TEXTURE:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_with_texture.vert" , ":/cgal/Polyhedron_3/resources/shader_with_texture.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_texture.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_texture.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("hasFMatrix", true);
    program->setProperty("hasTexture", true);
    return program;
  }
  case PROGRAM_PLANE_TWO_FACES:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ?declare_program(name, ":/cgal/Polyhedron_3/resources/shader_without_light.vert" , ":/cgal/Polyhedron_3/resources/shader_plane_two_faces.frag")
       : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_without_light.vert" ,
                         ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_plane_two_faces.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("hasFMatrix", true);
    return program;
  }
  case PROGRAM_WITH_TEXTURED_EDGES:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_with_textured_edges.vert" , ":/cgal/Polyhedron_3/resources/shader_with_textured_edges.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_textured_edges.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_textured_edges.frag");
    program->setProperty("hasFMatrix", true);
    program->setProperty("hasTexture", true);
    return program;
  }
  case PROGRAM_INSTANCED:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_instanced.vert" , ":/cgal/Polyhedron_3/resources/shader_with_light.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_instanced.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_light.frag");

    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("isInstanced", true);
    return program;
  }
  case PROGRAM_INSTANCED_WIRE:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_instanced.vert" , ":/cgal/Polyhedron_3/resources/shader_without_light.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_instanced.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_without_light.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("hasCenter", true);
    program->setProperty("isInstanced", true);
    return program;
  }
  case PROGRAM_CUTPLANE_SPHERES:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_c3t3_spheres.vert" , ":/cgal/Polyhedron_3/resources/shader_c3t3.frag")
        : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_c3t3_spheres.vert" ,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_c3t3.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("hasCenter", true);
    program->setProperty("hasRadius", true);
    program->setProperty("isInstanced", true);
    program->setProperty("hasCutPlane", true);
    return program;
  }
  case PROGRAM_SPHERES:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ?declare_program(name, ":/cgal/Polyhedron_3/resources/shader_spheres.vert" , ":/cgal/Polyhedron_3/resources/shader_with_light.frag")
       : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_spheres.vert" ,
                         ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_light.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("hasCenter", true);
    program->setProperty("hasRadius", true);
    program->setProperty("hasTransparency", true);
    program->setProperty("isInstanced", true);
    program->setProperty("hasFMatrix", true);
    return program;
  }
  case PROGRAM_DARK_SPHERES:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ?declare_program(name, ":/cgal/Polyhedron_3/resources/shader_dark_spheres.vert" , ":/cgal/Polyhedron_3/resources/shader_no_light_no_selection.frag")
       : declare_program(name, ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_dark_spheres.vert" ,
                         ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_no_light_no_selection.frag");
    program->setProperty("hasCenter", true);
    program->setProperty("hasRadius", true);
    program->setProperty("isInstanced", true);
    program->setProperty("hasFMatrix", true);
    return program;
  }
  case PROGRAM_FLAT:
  {
    if(!isOpenGL_4_3())
    {
      std::cerr<<"An OpenGL context of version 4.3 is required for the program ("<<name<<")."<<std::endl;
      return nullptr;
    }
    QOpenGLShaderProgram* program = declare_program(name, ":/cgal/Polyhedron_3/resources/shader_flat.vert", ":/cgal/Polyhedron_3/resources/shader_flat.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    return program;
  }
  case PROGRAM_OLD_FLAT:
  {
    QOpenGLShaderProgram* program = isOpenGL_4_3()
        ? declare_program(name, ":/cgal/Polyhedron_3/resources/shader_with_light.vert", ":/cgal/Polyhedron_3/resources/shader_old_flat.frag")
        : declare_program(name,
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_with_light.vert",
                          ":/cgal/Polyhedron_3/resources/compatibility_shaders/shader_old_flat.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    return program;
  }
  case PROGRAM_SOLID_WIREFRAME:
  {
    if(!isOpenGL_4_3())
    {
      std::cerr<<"An OpenGL context of version 4.3 is required for the program ("<<name<<")."<<std::endl;
      return nullptr;
    }
    QOpenGLShaderProgram* program = declare_program(name,
                                                    ":/cgal/Polyhedron_3/resources/solid_wireframe_shader.vert",
                                                    ":/cgal/Polyhedron_3/resources/solid_wireframe_shader.frag");
    program->setProperty("hasViewport", true);
    program->setProperty("hasWidth", true);
    program->setProperty("hasFMatrix", true);
    return program;
  }
  case PROGRAM_NO_INTERPOLATION:
  {
    if(!isOpenGL_4_3())
    {
      std::cerr<<"An OpenGL context of version 4.3 is required for the program ("<<name<<")."<<std::endl;
      return nullptr;
    }
    QOpenGLShaderProgram* program = declare_program(name,
                                                    ":/cgal/Polyhedron_3/resources/no_interpolation_shader.vert",
                                                    ":/cgal/Polyhedron_3/resources/no_interpolation_shader.frag");
    program->setProperty("hasLight", true);
    program->setProperty("hasNormals", true);
    program->setProperty("drawLinesAdjacency", true);
    return program;
  }
  default:
    std::cerr<<"ERROR : Program not found."<<std::endl;
    return nullptr;
  }
}

void Viewer::wheelEvent(QWheelEvent* e)
{
  if(e->modifiers().testFlag(Qt::ShiftModifier))
  {
    double delta = e->angleDelta().y();
    if(delta>0)
    {
      switch(camera()->type())
      {
      case CGAL::qglviewer::Camera::ORTHOGRAPHIC:
        camera()->setOrthoZNear(camera()->orthoZNear() + 0.01);
        break;
      case CGAL::qglviewer::Camera::PERSPECTIVE:
        camera()->setZNearCoefficient(camera()->zNearCoefficient() * 1.01);
        break;
      default:
        break;
      }
    }
    else
      switch(camera()->type())
      {
      case CGAL::qglviewer::Camera::ORTHOGRAPHIC:
        camera()->setOrthoZNear(camera()->orthoZNear() - 0.01);
        break;
      case CGAL::qglviewer::Camera::PERSPECTIVE:
        camera()->setZNearCoefficient(camera()->zNearCoefficient() / 1.01);
        break;
      default:
        break;
      }
    update();
  }
  else
    CGAL::QGLViewer::wheelEvent(e);
}

bool Viewer::testDisplayId(double x, double y, double z)
{
    return d->scene->testDisplayId(x,y,z,this);
}

QPainter* Viewer::getPainter(){return d->painter;}

void Viewer::paintEvent(QPaintEvent *)
{
  paintGL();
}

void Viewer::paintGL()
{
  makeCurrent();
  if (!d->painter->isActive())
    d->painter->begin(this);
  if(d->is_2d_selection_mode)
  {
    d->painter->drawImage(QPoint(0,0), d->static_image);
  }
  else
  {
    d->painter->beginNativePainting();
    glClearColor(GLfloat(backgroundColor().redF()),
                 GLfloat(backgroundColor().greenF()),
                 GLfloat(backgroundColor().blueF()),
                 1.f);
    glClearDepthf(1.0f);
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    //set the default frustum
    if(d->projection_is_ortho)
      camera()->setType(CGAL::qglviewer::Camera::ORTHOGRAPHIC);
    else
      camera()->setType(CGAL::qglviewer::Camera::PERSPECTIVE);
    preDraw();
    draw();
    postDraw();
    d->painter->endNativePainting();
  }
  d->painter->end();
  doneCurrent();
}

void Viewer::displayMessage(const QString &_message, int delay)
{
          d->message = _message;
          d->_displayMessage = true;
          // Was set to single shot in defaultConstructor.
          d->messageTimer.start(delay);
          if (textIsEnabled())
                  update();
}
void Viewer::hideMessage()
{
        d->_displayMessage = false;
        if (textIsEnabled())
                update();
}
void Viewer::printMessage(QString _message, int ms_delay)
{
  displayMessage(_message, ms_delay);
}

void Viewer_impl::showDistance(QPoint pixel)
{
    static bool isAset = false;
    bool found;
    CGAL::qglviewer::Vec point;
    point = viewer->camera()->pointUnderPixel(pixel, found);
    if(!isAset && found)
    {
        //set APoint
        APoint = point;
        isAset = true;
        clearDistancedisplay();
    }
    else if (found)
    {
        //set BPoint
        BPoint = point;
        isAset = false;

        // fills the buffers
        std::vector<float> v;
        v.resize(6);
        v[0] = float(APoint.x); v[1] = float(APoint.y); v[2] = float(APoint.z);
        v[3] = float(BPoint.x); v[4] = float(BPoint.y); v[5] = float(BPoint.z);

        vao.bind();
        buffer.bind();
        buffer.allocate(v.data(),6*sizeof(float));
        rendering_program_dist.enableAttributeArray("vertex");
        rendering_program_dist.setAttributeBuffer("vertex",GL_FLOAT,0,3);
        buffer.release();
        vao.release();
        distance_is_displayed = true;
        double dist = std::sqrt((BPoint.x-APoint.x)/scaler.x()*(BPoint.x-APoint.x)/scaler.x() + (BPoint.y-APoint.y)/scaler.y()*(BPoint.y-APoint.y)/scaler.y() + (BPoint.z-APoint.z)/scaler.z()*(BPoint.z-APoint.z)/scaler.z());
        QFont font;
        font.setBold(true);
        TextItem *ACoord = new TextItem(float(APoint.x),
                                        float(APoint.y),
                                        float(APoint.z),
                                        QString("A(%1,%2,%3)")
                                        .arg(APoint.x/scaler.x()-viewer->offset().x, 0, 'g', 10)
                                        .arg(APoint.y/scaler.y()-viewer->offset().y, 0, 'g', 10)
                                        .arg(APoint.z/scaler.z()-viewer->offset().z, 0, 'g', 10), true, font, Qt::red, true);
        distance_text.append(ACoord);
        TextItem *BCoord = new TextItem(float(BPoint.x),
                                        float(BPoint.y),
                                        float(BPoint.z),
                                        QString("B(%1,%2,%3)")
                                        .arg(BPoint.x/scaler.x()-viewer->offset().x, 0, 'g', 10)
                                        .arg(BPoint.y/scaler.y()-viewer->offset().y, 0, 'g', 10)
                                        .arg(BPoint.z/scaler.z()-viewer->offset().z, 0, 'g', 10), true, font, Qt::red, true);

        distance_text.append(BCoord);
        CGAL::qglviewer::Vec centerPoint = 0.5*(BPoint+APoint);
        TextItem *centerCoord = new TextItem(float(centerPoint.x),
                                             float(centerPoint.y),
                                             float(centerPoint.z),
                                             QString(" distance: %1").arg(dist), true, font, Qt::red, true);

        distance_text.append(centerCoord);
        Q_FOREACH(TextItem* ti, distance_text)
          textRenderer->addText(ti);
        Q_EMIT(viewer->sendMessage(QString("First point : A(%1,%2,%3), second point : B(%4,%5,%6), distance between them : %7")
                  .arg(APoint.x/scaler.x()-viewer->offset().x)
                  .arg(APoint.y/scaler.y()-viewer->offset().y)
                  .arg(APoint.z/scaler.z()-viewer->offset().z)
                  .arg(BPoint.x/scaler.x()-viewer->offset().x)
                  .arg(BPoint.y/scaler.y()-viewer->offset().y)
                  .arg(BPoint.z/scaler.z()-viewer->offset().z)
                  .arg(dist, 0, 'g', 10)));
    }

}

void Viewer_impl::clearDistancedisplay()
{
  distance_is_displayed = false;
  Q_FOREACH(TextItem* ti, distance_text)
  {
    textRenderer->removeText(ti);
    delete ti;
  }
  distance_text.clear();
}

void Viewer_impl::sendSnapshotToClipboard(Viewer *viewer)
{
  QImage * snap = viewer->takeSnapshot(CGAL::qglviewer::TRANSPARENT_BACKGROUND, 2*viewer->size(), 1, true);
  if(snap)
  {
#if defined(_WIN32)
    QApplication::clipboard()->setImage(*snap);
    QMimeData *mimeData = new QMimeData();
    QByteArray ba;
    QBuffer buffer(&ba);
    buffer.open(QIODevice::WriteOnly);
    snap->save(&buffer, "PNG"); // writes image into ba in PNG format
    buffer.close();
    mimeData->setData("PNG", ba);
    //According to the doc, the ownership of mime_data is transferred to
    //clipboard, so this is not a memory leak.
    QApplication::clipboard()->setMimeData(mimeData);
#else
    QApplication::clipboard()->setImage(*snap);
#endif
    delete snap;
  }
}
void Viewer::SetOrthoProjection(bool b)
{
  d->projection_is_ortho = b;
  update();
}

void Viewer::updateIds(CGAL::Three::Scene_item * item)
{
  //all ids are computed when they are displayed the first time.
  //Calling printPrimitiveIds twice hides and show the ids again, so they are re-computed.

  d->scene->updatePrimitiveIds(item);
  d->scene->updatePrimitiveIds(item);
}


TextRenderer* Viewer::textRenderer()
{
  return d->textRenderer;
}

bool Viewer::isExtensionFound()
{
  return d->extension_is_found;

}

void Viewer::disableClippingBox()
{
  d->clipping = false;
}

void Viewer::enableClippingBox(QVector4D box[6])
{
  d->clipping = true;
  for(int i=0; i<6; ++i)
    d->clipbox[i] = box[i];
}

QOpenGLFunctions_4_3_Core *Viewer::openGL_4_3_functions() { return d->_recentFunctions; }

void Viewer::set2DSelectionMode(bool b) { d->is_2d_selection_mode = b; }

void Viewer::setStaticImage(QImage image) { d->static_image = image; }

const QImage& Viewer:: staticImage() const { return d->static_image; }


void Viewer::setCurrentPass(int pass) { d->current_pass = pass; }

void Viewer::setDepthWriting(bool writing_depth) { d->writing_depth = writing_depth; }

void Viewer::setDepthPeelingFbo(QOpenGLFramebufferObject* fbo) { d->dp_fbo = fbo; }

int Viewer::currentPass()const{ return d->current_pass; }
bool Viewer::isDepthWriting()const{ return d->writing_depth; }
QOpenGLFramebufferObject *Viewer::depthPeelingFbo(){ return d->dp_fbo; }
float Viewer::total_pass()
{
  return d->current_total_pass * 1.0f;
}
void Viewer::setTotalPass(int p)
{
  d->total_pass = p;
  update();
}

void Viewer::messageLogged(QOpenGLDebugMessage msg)
{
  //filter out useless warning
  // From those two links, we decided we didn't care for this warning:
  // https://community.khronos.org/t/vertex-shader-in-program-2-is-being-recompiled-based-on-gl-state/76019
  // https://stackoverflow.com/questions/12004396/opengl-debug-context-performance-warning
  if(msg.message().contains("is being recompiled"))
    return;
  QString error;

  // Format based on severity
  switch (msg.severity())
  {
  case QOpenGLDebugMessage::NotificationSeverity:
    return;
    break;
  case QOpenGLDebugMessage::HighSeverity:
    error += "GL ERROR :";
    break;
  case QOpenGLDebugMessage::MediumSeverity:
    error += "GL WARNING :";
    break;
  case QOpenGLDebugMessage::LowSeverity:
    error += "GL NOTE :";
    break;
  default:
    break;
  }

  error += " (";

  // Format based on source
#define CASE(c) case QOpenGLDebugMessage::c: error += #c; break
  switch (msg.source())
  {
  CASE(APISource);
  CASE(WindowSystemSource);
  CASE(ShaderCompilerSource);
  CASE(ThirdPartySource);
  CASE(ApplicationSource);
  CASE(OtherSource);
  CASE(InvalidSource);
  default:
    break;
  }
#undef CASE

  error += " : ";

  // Format based on type
#define CASE(c) case QOpenGLDebugMessage::c: error += #c; break
  switch (msg.type())
  {
  CASE(ErrorType);
  CASE(DeprecatedBehaviorType);
  CASE(UndefinedBehaviorType);
  CASE(PortabilityType);
  CASE(PerformanceType);
  CASE(OtherType);
  CASE(MarkerType);
  CASE(GroupPushType);
  CASE(GroupPopType);
  default:
    break;
  }
#undef CASE

  error += ")";
  qDebug() << qPrintable(error) << "\n" << qPrintable(msg.message()) << "\n";
}

void Viewer::setLighting()
{

  //save current settings;
  float prev_spec = d->spec_power;
  QVector4D prev_pos = d->position;
  QVector4D prev_ambient = d->ambient;
  QVector4D prev_diffuse = d->diffuse;
  QVector4D prev_spec_color = d->specular;
  //open dialog
  LightingDialog* dialog = new LightingDialog(d);
  //set specular
  connect(dialog->spec_powrSlider, &QSlider::valueChanged,
          [this, dialog]()
  {
    d->spec_power = dialog->spec_powrSlider->value();
    update();
  });
  //set position
  connect(dialog->position_lineEdit, &QLineEdit::editingFinished,
          [this, dialog]()
  {
    QStringList list = dialog->position_lineEdit->text().split(QRegExp(","), CGAL_QT_SKIP_EMPTY_PARTS);
    if (list.isEmpty()) return;
    if (list.size()!=3){
      QMessageBox *msgBox = new QMessageBox;
      msgBox->setWindowTitle("Error");
      msgBox->setText("ERROR : Input should consists of 3 floats.");
      msgBox->exec();
      return;
    }
    float coords[3];
    for(int j=0; j<3; ++j)
    {
      bool ok;
      coords[j] = list.at(j).toFloat(&ok);
      if(!ok)
      {
          QMessageBox *msgBox = new QMessageBox;
          msgBox->setWindowTitle("Error");
          msgBox->setText("ERROR : Coordinates are invalid.");
          msgBox->exec();
          return;
      }
    }
    d->position = QVector4D(coords[0], coords[1], coords[2], 1.0f);
    update();
  });


  //set ambient
  connect(dialog, &LightingDialog::s_ambient_changed,
          [this, dialog](){
    d->ambient=QVector4D((float)dialog->ambient.redF(),
                         (float)dialog->ambient.greenF(),
                         (float)dialog->ambient.blueF(),
                         1.0f);
    update();
  });

  //set diffuse
  connect(dialog, &LightingDialog::s_diffuse_changed,
          [this, dialog](){
    d->diffuse=QVector4D((float)dialog->diffuse.redF(),
                         (float)dialog->diffuse.greenF(),
                         (float)dialog->diffuse.blueF(),
                         1.0f);
    update();
  });
  //set specular
  connect(dialog, &LightingDialog::s_specular_changed,
          [this, dialog](){
    d->specular=QVector4D((float)dialog->specular.redF(),
                          (float)dialog->specular.greenF(),
                          (float)dialog->specular.blueF(),
                         1.0f);
    update();

  });

  //reset default
  connect(dialog->buttonBox->button(QDialogButtonBox::StandardButton::RestoreDefaults), &QPushButton::clicked,
          [this](){
    d->position = QVector4D(0,0,1,1);
    d->ambient=QVector4D(77.0f/255,77.0f/255,77.0f/255, 1.0);
    d->diffuse=QVector4D(204.0f/255,204.0f/255,204.0f/255,1.0);
    d->specular=QVector4D(0,0,0,1.0);
    d->spec_power = 51;
    update();

  });
  if(!dialog->exec())
  {
    //restore previous settings
    d->spec_power = prev_spec;
    d->position = prev_pos;
    d->ambient = prev_ambient;
    d->diffuse = prev_diffuse;
    d->specular = prev_spec_color;
    return;
  }
}

void Viewer::setBackFrontColors()
{

  //save current settings;

  QColor prev_front_color = d->front_color;
  QColor prev_back_color = d->back_color;
  QDialog *dialog = new QDialog(this);
  QDialogButtonBox* buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok
                                   | QDialogButtonBox::Cancel, dialog);

  connect(buttonBox, &QDialogButtonBox::accepted, dialog, &QDialog::accept);
  connect(buttonBox, &QDialogButtonBox::rejected, dialog, &QDialog::reject);

  QGridLayout* layout = new QGridLayout(dialog);
  layout->addWidget(new QLabel("Front color: ",dialog),0,0);
  QPalette front_palette;
  front_palette.setColor(QPalette::Button, d->front_color);
  QPushButton* frontButton = new QPushButton(dialog);
  frontButton->setPalette(front_palette);
  QPalette back_palette;
  back_palette.setColor(QPalette::Button, d->back_color);
  QPushButton* backButton = new QPushButton(dialog);
  backButton->setPalette(back_palette);
  layout->addWidget(frontButton,0,1);
  layout->addWidget(new QLabel("Back color: ",dialog),1,0);
  layout->addWidget(backButton,1,1);
  layout->addWidget(buttonBox);
  dialog->setLayout(layout);
  connect(frontButton, &QPushButton::clicked,
          [this, dialog, frontButton](){
    QColorDialog *color_dial = new QColorDialog(dialog);
    color_dial->exec();
    QColor front_color = color_dial->selectedColor();
    QPalette palette;
    palette.setColor(QPalette::Button, front_color);
    frontButton->setPalette(palette);
    d->front_color= front_color;
  });
  connect(backButton, &QPushButton::clicked,
          [this, dialog, backButton](){
    QColorDialog *color_dial = new QColorDialog(dialog);
    color_dial->exec();
    QColor back_color = color_dial->selectedColor();
    QPalette palette;
    palette.setColor(QPalette::Button, back_color);
    backButton->setPalette(palette);
    d->back_color= back_color;

  });
  if(!dialog->exec())
  {
    //restore previous settings
    d->front_color= prev_front_color;
    d->back_color= prev_back_color;
    return;
  }
}

void Viewer::setGlPointSize(const GLfloat &p) { d->gl_point_size = p; }

const GLfloat& Viewer::getGlPointSize() const { return d->gl_point_size; }

void Viewer::resetFov()
{
  camera()->setHorizontalFieldOfView(ORIGINAL_FOV);
}

void Viewer::initializeGL()
{
  QGLViewer::initializeGL();
  doneInitGL(this);
}

void Viewer::makeCurrent()
{
  CGAL::Three::Three::setCurrentViewer(this);
  QOpenGLWidget::makeCurrent();
}

QVector4D* Viewer::clipBox() const
{
  return d->clipbox;
}

bool Viewer::isClipping() const
{
  return d->clipping;
}

void Viewer::scaleScene()
{
  CGAL::Bbox_3 bbox = CGAL::Three::Three::scene()->bbox();
  if(!d->scene_scaling)
  {
    QMultipleInputDialog dialog ("Scale Scene", CGAL::Three::Three::mainWindow());
    DoubleEdit* x_val = dialog.add<DoubleEdit> ("Scale along X");
    DoubleEdit* y_val = dialog.add<DoubleEdit> ("Scale along Y");
    DoubleEdit* z_val = dialog.add<DoubleEdit> ("Scale along Z");
    x_val->setMinimum(0);
    y_val->setMinimum(0);
    z_val->setMinimum(0);
    if(bbox != CGAL::Bbox_3(0,0,0,0,0,0))
    {
      QPushButton* norm_button = dialog.add<QPushButton> ("");
      norm_button->setText("Normalize");
      norm_button->setToolTip("Automatically fill values to display the scene in a unit cube.");

      connect(norm_button, &QPushButton::clicked, this,
              [x_val, y_val, z_val, &bbox](){
        x_val->setValue(1.0/(bbox.xmax()-bbox.xmin()));
        y_val->setValue(1.0/(bbox.ymax()-bbox.ymin()));
        z_val->setValue(1.0/(bbox.zmax()-bbox.zmin()));
      });
    }
    if (dialog.exec() != QDialog::Accepted)
    {
      parent()->findChild<QAction*>("actionScaleScene")->setChecked(false);
      return;
    }
    d->scaler.setX(x_val->text()==""?1.0:x_val->value());
    d->scaler.setY(y_val->text()==""?1.0:y_val->value());
    d->scaler.setZ(z_val->text()==""?1.0:z_val->value());

    if(d->scaler.x() == 0.0 || d->scaler.y() == 0.0 || d->scaler.z()== 0.0)
    {
      parent()->findChild<QAction*>("actionScaleScene")->setChecked(false);
      return;
    }
  }
  else
    d->scaler = QVector3D(1,1,1);

  CGAL::qglviewer::Vec vmin(((float)bbox.xmin()+offset().x)*d->scaler.x(), ((float)bbox.ymin()+offset().y)*d->scaler.y(), ((float)bbox.zmin()+offset().z)*d->scaler.z()),
      vmax(((float)bbox.xmax()+offset().x)*d->scaler.x(), ((float)bbox.ymax()+offset().y)*d->scaler.y(), ((float)bbox.zmax()+offset().z)*d->scaler.z());
  camera()->setPivotPoint((vmin+vmax)*0.5);
  camera()->setSceneBoundingBox(vmin, vmax);
  camera()->fitBoundingBox(vmin, vmax);
  d->scene_scaling = !d->scene_scaling;
}
#ifdef CGAL_USE_WEBSOCKETS
void Viewer::setShareCam(bool b, QString session)
{
  static bool init = false;
  if(b)
  {
    d->cam_sharing = b;
    d->session = session;
    QString ws_url
        = CGAL::Three::Three::mainWindow()->property("ws_url").toString();
    if(ws_url.isEmpty())
    {
      QMessageBox::warning(this, "Error", "No Server configured. Please go to Edit->Preferences->Network Settings and fill the \"Camera Synchronization Server\" Field.");
    }
    else{
      if(!init)
      {
        connect(&d->m_webSocket, &QWebSocket::connected, this, &Viewer::onSocketConnected);
        connect(&d->m_webSocket, &QWebSocket::disconnected, this,[this]()
        {
          d->is_connected = false;
          Viewer::socketClosed();
        });
        init = true;
      }
      d->m_webSocket.open(QUrl(ws_url));
      QApplication::setOverrideCursor(Qt::WaitCursor);
      QTimer::singleShot(1000, this, [this](){
        QApplication::restoreOverrideCursor();
        if(!d->is_connected){
          QMessageBox::warning(CGAL::Three::Three::mainWindow(),
                               "Connection failure",
                               "The requested server was not found.");
          setShareCam(false, "");
        }
      });
    }
  }
  else
  {
    QAction* action = findChild<QAction*>("actionShareCamera");
    action->setChecked(false);
    d->m_webSocket.close();
  }
}

void Viewer::onSocketConnected()
{
  connect(&d->m_webSocket, &QWebSocket::textMessageReceived,
          this, &Viewer::onTextMessageSocketReceived);
  connect(camera()->frame(), &CGAL::qglviewer::ManipulatedCameraFrame::manipulated,
          this, [this](){
    if(d->cam_sharing){
      QString cam_state = QString("[%1] %2").arg(d->session).arg(dumpCameraCoordinates());
      //send to server
      d->m_webSocket.sendTextMessage(cam_state);
    }
  });
  d->is_connected = true;
}

void Viewer::onTextMessageSocketReceived(QString message)
{
  QString session;
  QString position;
  QRegularExpression re("\\[(.*)\\] (.*)");
  QRegularExpressionMatch match = re.match(message);
  session = match.captured(1);
  position = match.captured(2);
  if(session != d->session){
    return;
  }
  QStringList sl = position.split(" ");
  if(sl.size() != 7)
    return;

  CGAL::qglviewer::Vec pos(sl[0].toDouble(),sl[1].toDouble(),sl[2].toDouble());
  CGAL::qglviewer::Quaternion q(sl[3].toDouble(),sl[4].toDouble(),
      sl[5].toDouble(),sl[6].toDouble());
  camera()->frame()->setPositionAndOrientation(pos, q);
  update();
}
#endif

const QVector3D& Viewer::scaler()const { return d->scaler; }
void Viewer::showEntireScene()
{
  CGAL::QGLViewer::showEntireScene();
  CGAL::Bbox_3 bbox = CGAL::Three::Three::scene()->bbox();

  CGAL::qglviewer::Vec vmin(((float)bbox.xmin()+offset().x)*d->scaler.x(), ((float)bbox.ymin()+offset().y)*d->scaler.y(), ((float)bbox.zmin()+offset().z)*d->scaler.z()),
      vmax(((float)bbox.xmax()+offset().x)*d->scaler.x(), ((float)bbox.ymax()+offset().y)*d->scaler.y(), ((float)bbox.zmax()+offset().z)*d->scaler.z());
  camera()->setPivotPoint((vmin+vmax)*0.5);
  camera()->setSceneBoundingBox(vmin, vmax);
  camera()->fitBoundingBox(vmin, vmax);
}
#include "Viewer.moc"