EventQtSlotConnect

VTKExamples/Cxx/Qt/EventQtSlotConnect

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

EventQtSlotConnect.cxx

#include "EventQtSlotConnect.h"

#include "vtkGenericOpenGLRenderWindow.h"
#include <vtkEventQtSlotConnect.h>
#include <vtkInteractorStyleTrackballActor.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
#include <vtkVersion.h>

#if VTK_VERSION_NUMBER >= 89000000000ULL
#define VTK890 1
#endif

// Constructor
EventQtSlotConnect::EventQtSlotConnect()
{
  this->setupUi(this);

  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkGenericOpenGLRenderWindow> renderWindow;
#if VTK890
  this->qvtkWidget->setRenderWindow(renderWindow);
#else
  this->qvtkWidget->SetRenderWindow(renderWindow);
#endif

  vtkNew<vtkEventQtSlotConnect> slotConnector;
  this->Connections = slotConnector;

  // Sphere
  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->Update();
  vtkNew<vtkPolyDataMapper> sphereMapper;
  sphereMapper->SetInputConnection(sphereSource->GetOutputPort());

  vtkNew<vtkActor> sphereActor;
  sphereActor->SetMapper(sphereMapper);
  sphereActor->GetProperty()->SetColor(colors->GetColor4d("Tomato").GetData());

  // VTK Renderer
  vtkNew<vtkRenderer> renderer;
  renderer->AddActor(sphereActor);
  renderer->SetBackground(colors->GetColor3d("SteelBlue").GetData());

#if VTK890
  this->qvtkWidget->renderWindow()->AddRenderer(renderer);
#else
  this->qvtkWidget->GetRenderWindow()->AddRenderer(renderer);
#endif

#if VTK890
  this->Connections->Connect(
      this->qvtkWidget->renderWindow()->GetInteractor(),
      vtkCommand::LeftButtonPressEvent, this,
      SLOT(slot_clicked(vtkObject*, unsigned long, void*, void*)));
#else
  this->Connections->Connect(
      this->qvtkWidget->GetRenderWindow()->GetInteractor(),
      vtkCommand::LeftButtonPressEvent, this,
      SLOT(slot_clicked(vtkObject*, unsigned long, void*, void*)));
#endif
};

void EventQtSlotConnect::slot_clicked(vtkObject*, unsigned long, void*, void*)
{
  std::cout << "Clicked." << std::endl;
}

EventQtSlotConnectDriver.cxx

#include <QApplication>
#include <QSurfaceFormat>
#include "EventQtSlotConnect.h"

int main(int argc, char** argv)
{
  // needed to ensure appropriate OpenGL context is created for VTK rendering.
  QSurfaceFormat::setDefaultFormat(QVTKOpenGLNativeWidget::defaultFormat());

  QApplication app(argc, argv);

  EventQtSlotConnect eventQtSlotConnect;
  eventQtSlotConnect.show();

  return app.exec();
}

EventQtSlotConnect.h

#ifndef EventQtSlotConnect_H
#define EventQtSlotConnect_H

#include "ui_EventQtSlotConnect.h"

#include <QMainWindow>

#include <vtkSmartPointer.h>
#include <vtkObject.h>
class vtkEventQtSlotConnect;

class EventQtSlotConnect : public QMainWindow, private Ui::EventQtSlotConnect
{
  Q_OBJECT
public:

  EventQtSlotConnect();

public slots:

  void slot_clicked(vtkObject*, unsigned long, void*, void*);

private:

  vtkSmartPointer<vtkEventQtSlotConnect> Connections;
};

#endif

EventQtSlotConnect.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>EventQtSlotConnect</class>
 <widget class="QMainWindow" name="EventQtSlotConnect">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>561</width>
    <height>575</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>EventQtSlotConnect</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QHBoxLayout" name="horizontalLayout">
    <item>
     <widget class="QVTKOpenGLNativeWidget" name="qvtkWidget">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Expanding" vsizetype="MinimumExpanding">
        <horstretch>0</horstretch>
        <verstretch>0</verstretch>
       </sizepolicy>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
  <action name="actionOpenFile">
   <property name="enabled">
    <bool>true</bool>
   </property>
   <property name="text">
    <string>Open File...</string>
   </property>
  </action>
  <action name="actionExit">
   <property name="text">
    <string>Exit</string>
   </property>
  </action>
  <action name="actionPrint">
   <property name="text">
    <string>Print</string>
   </property>
  </action>
  <action name="actionHelp">
   <property name="text">
    <string>Help</string>
   </property>
  </action>
  <action name="actionSave">
   <property name="text">
    <string>Save</string>
   </property>
  </action>
 </widget>
 <customwidgets>
  <customwidget>
   <class>QVTKOpenGLNativeWidget</class>
   <extends>QWidget</extends>
   <header>QVTKOpenGLNativeWidget.h</header>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

if(POLICY CMP0020)
  cmake_policy(SET CMP0020 NEW)
  cmake_policy(SET CMP0071 NEW)
endif()

PROJECT(EventQtSlotConnect)

find_package(VTK COMPONENTS

  vtkCommonColor
  vtkCommonCore
  vtkFiltersSources
  vtkGUISupportQt
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping EventQtSlotConnect: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")

if(vtkGUISupportQt_LOADED OR TARGET VTK::GUISupportQt)
  if (VTK_VERSION VERSION_LESS "8.90.0")
    # Instruct CMake to run moc automatically when needed.
    set(CMAKE_AUTOMOC ON)
  else()
     # Instruct CMake to run moc automatically when needed.
    set(CMAKE_AUTOMOC ON)
    set(CMAKE_AUTOUIC ON)
  endif()
  # We have ui files, this will bring in the macro: qt5_wrap_ui
  find_package(Qt5Widgets REQUIRED QUIET)
else()
  message(STATUS "GuiSupportQt not found.")
  return()
endif()

include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})

file(GLOB UI_FILES *.ui)
file(GLOB QT_WRAP *.h)
file(GLOB CXX_FILES *.cxx)

qt5_wrap_ui(UISrcs ${UI_FILES})

if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  # CMAKE_AUTOMOC in ON so the MOC headers will be automatically wrapped.
  add_executable(EventQtSlotConnect MACOSX_BUNDLE
    ${CXX_FILES} ${UISrcs} ${QT_WRAP})
  qt5_use_modules(EventQtSlotConnect Core Gui)
  target_link_libraries(EventQtSlotConnect ${VTK_LIBRARIES})
else()
  # CMAKE_AUTOMOC in ON so the MOC headers will be automatically wrapped.
  add_executable(EventQtSlotConnect MACOSX_BUNDLE
    ${CXX_FILES} ${UISrcs} ${QT_WRAP})
  qt5_use_modules(EventQtSlotConnect Core Gui)
  target_link_libraries(EventQtSlotConnect ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS EventQtSlotConnect
    MODULES ${VTK_LIBRARIES}
  )
endif()

Download and Build EventQtSlotConnect

Click here to download EventQtSlotConnect and its CMakeLists.txt file. Once the tarball EventQtSlotConnect.tar has been downloaded and extracted,

 cd EventQtSlotConnect/build

This example requires Qt and VTK.

If VTK and Qt are installed:

 cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

 cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

If Qt is not found on your system, you will need to tell CMake where to find qmake:

cmake -DQT_QMAKE_EXECUTABLE:FILEPATH=/usr/something/qmake  ..

Build the project:

make

and run it:

./EventQtSlotConnect

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time. You may also need to add a Qt related path.