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# RenderWindowUIMultipleInheritance

VTKEx/Cxx/Qt/RenderWindowUIMultipleInheritance

Question

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### Code

RenderWindowUIMultipleInheritance.cxx

    #include "RenderWindowUIMultipleInheritance.h"

    #include <vtkGenericOpenGLRenderWindow.h>
    #include <vtkNamedColors.h>
    #include <vtkNew.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkSmartPointer.h>
    #include <vtkSphereSource.h>
    #include <vtkVersion.h>

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

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

      vtkNew<vtkNamedColors> colors;

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

      // Sphere
      auto sphereSource = vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();
      auto sphereMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
      auto sphereActor = vtkSmartPointer<vtkActor>::New();
      sphereActor->SetMapper(sphereMapper);
      sphereActor->GetProperty()->SetColor(colors->GetColor4d("Tomato").GetData());

      // VTK Renderer
      auto renderer = vtkSmartPointer<vtkRenderer>::New();
      renderer->AddActor(sphereActor);
      renderer->SetBackground(colors->GetColor3d("SteelBlue").GetData());

      // VTK/Qt wedded
    #if VTK890
      this->qvtkWidget->renderWindow()->AddRenderer(renderer);
      this->qvtkWidget->renderWindow()->SetWindowName(
          "RenderWindowUIMultipleInheritance");
    #else
      this->qvtkWidget->GetRenderWindow()->AddRenderer(renderer);
      this->qvtkWidget->GetRenderWindow()->SetWindowName(
          "RenderWindowUIMultipleInheritance");
    #endif

      // Set up action signals and slots
      connect(this->actionExit, SIGNAL(triggered()), this, SLOT(slotExit()));
    };

    void RenderWindowUIMultipleInheritance::slotExit()
    {
      qApp->exit();
    }

RenderWindowUIMultipleInheritance.h

    #ifndef RenderWindowUIMultipleInheritance_H
    #define RenderWindowUIMultipleInheritance_H

    #include "ui_RenderWindowUIMultipleInheritance.h"

    #include <QMainWindow>

    class RenderWindowUIMultipleInheritance
      : public QMainWindow,
        private Ui::RenderWindowUIMultipleInheritance
    {
      Q_OBJECT
    public:
      RenderWindowUIMultipleInheritance();

    public slots:

      void slotExit();
    };

    #endif

RenderWindowUIMultipleInheritance.ui

    <?xml version="1.0" encoding="UTF-8"?>
    <ui version="4.0">
     <class>RenderWindowUIMultipleInheritance</class>
     <widget class="QMainWindow" name="RenderWindowUIMultipleInheritance">
      <property name="geometry">
       <rect>
        <x>0</x>
        <y>0</y>
        <width>541</width>
        <height>583</height>
       </rect>
      </property>
      <property name="windowTitle">
       <string>RenderWindowUIMultipleInheritance</string>
      </property>
      <widget class="QWidget" name="centralwidget">
       <widget class="QVTKOpenGLNativeWidget" name="qvtkWidget">
        <property name="geometry">
         <rect>
          <x>10</x>
          <y>20</y>
          <width>511</width>
          <height>541</height>
         </rect>
        </property>
       </widget>
      </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>

     </resources>
     <connections/>
    </ui>

RenderWindowUIMultipleInheritanceDriver.cxx

    #include <QApplication>
    #include <QSurfaceFormat>
    #include <QVTKOpenGLNativeWidget.h>

    #include "RenderWindowUIMultipleInheritance.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);

      RenderWindowUIMultipleInheritance renderWindowUIMultipleInheritance;
      renderWindowUIMultipleInheritance.show();

      return app.exec();
    }

### 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(RenderWindowUIMultipleInheritance)

    find_package(VTK COMPONENTS

      vtkCommonColor
      vtkCommonCore
      vtkFiltersSources
      vtkInteractionStyle
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2
      QUIET
    )

    if (NOT VTK_FOUND)
      message("Skipping RenderWindowUIMultipleInheritance: ${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(RenderWindowUIMultipleInheritance MACOSX_BUNDLE
        ${CXX_FILES} ${UISrcs} ${QT_WRAP})
      qt5_use_modules(RenderWindowUIMultipleInheritance Core Gui)
      target_link_libraries(RenderWindowUIMultipleInheritance ${VTK_LIBRARIES})
    else()
      # CMAKE_AUTOMOC in ON so the MOC headers will be automatically wrapped.
      add_executable(RenderWindowUIMultipleInheritance MACOSX_BUNDLE
        ${CXX_FILES} ${UISrcs} ${QT_WRAP})
      qt5_use_modules(RenderWindowUIMultipleInheritance Core Gui)
      target_link_libraries(RenderWindowUIMultipleInheritance ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS RenderWindowUIMultipleInheritance
        MODULES ${VTK_LIBRARIES}
      )
    endif()

### Download and Build RenderWindowUIMultipleInheritance

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

     cd RenderWindowUIMultipleInheritance/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:

    ./RenderWindowUIMultipleInheritance

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.