# SideBySideRenderWindowsQt

VTKExamples/Cxx/Qt/SideBySideRenderWindowsQt

### Code

SideBySideRenderWindowsQt.cxx

    #include "SideBySideRenderWindowsQt.h"

    #include <vtkDataObjectToTable.h>
    #include <vtkElevationFilter.h>
    #include "vtkGenericOpenGLRenderWindow.h"
    #include <vtkPolyDataMapper.h>
    #include <vtkQtTableView.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkSphereSource.h>
    #include <vtkCubeSource.h>
    #include <vtkSmartPointer.h>

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

      vtkNew<vtkGenericOpenGLRenderWindow> renderWindowLeft;
      this->qvtkWidgetLeft->SetRenderWindow(renderWindowLeft);

      vtkNew<vtkGenericOpenGLRenderWindow> renderWindowRight;
      this->qvtkWidgetRight->SetRenderWindow(renderWindowRight);

      // Sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
          vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();
      vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
          vtkSmartPointer<vtkPolyDataMapper>::New();
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> sphereActor =
          vtkSmartPointer<vtkActor>::New();
      sphereActor->SetMapper(sphereMapper);

      // Cube
      vtkSmartPointer<vtkCubeSource> cubeSource =
          vtkSmartPointer<vtkCubeSource>::New();
      cubeSource->Update();
      vtkSmartPointer<vtkPolyDataMapper> cubeMapper =
          vtkSmartPointer<vtkPolyDataMapper>::New();
      cubeMapper->SetInputConnection(cubeSource->GetOutputPort());
      vtkSmartPointer<vtkActor> cubeActor =
          vtkSmartPointer<vtkActor>::New();
      cubeActor->SetMapper(cubeMapper);

      // VTK Renderer
      vtkSmartPointer<vtkRenderer> leftRenderer =
          vtkSmartPointer<vtkRenderer>::New();
      leftRenderer->AddActor(sphereActor);

      vtkSmartPointer<vtkRenderer> rightRenderer =
          vtkSmartPointer<vtkRenderer>::New();

      // Add Actor to renderer
      rightRenderer->AddActor(cubeActor);

      // VTK/Qt wedded
      this->qvtkWidgetLeft->GetRenderWindow()->AddRenderer(leftRenderer);
      this->qvtkWidgetRight->GetRenderWindow()->AddRenderer(rightRenderer);

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

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

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

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

    PROJECT(SideBySideRenderWindowsQt)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    if(${VTK_VERSION} VERSION_GREATER "6" AND VTK_QT_VERSION VERSION_GREATER "4")
      # Instruct CMake to run moc automatically when needed.
      set(CMAKE_AUTOMOC ON)
      find_package(Qt5Widgets REQUIRED QUIET)
    else()
      find_package(Qt4 REQUIRED)
      include(${QT_USE_FILE})
    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)

    if(${VTK_VERSION} VERSION_GREATER "6" AND VTK_QT_VERSION VERSION_GREATER "4")
      qt5_wrap_ui(UISrcs ${UI_FILES} )
      # CMAKE_AUTOMOC in ON so the MOC headers will be automatically wrapped.
      add_executable(SideBySideRenderWindowsQt MACOSX_BUNDLE
        ${CXX_FILES} ${UISrcs} ${QT_WRAP})
      qt5_use_modules(SideBySideRenderWindowsQt Core Gui)
      target_link_libraries(SideBySideRenderWindowsQt ${VTK_LIBRARIES})
    else()
      QT4_WRAP_UI(UISrcs ${UI_FILES})
      QT4_WRAP_CPP(MOCSrcs ${QT_WRAP})
      add_executable(SideBySideRenderWindowsQt MACOSX_BUNDLE ${CXX_FILES} ${UISrcs} ${MOCSrcs})
      target_link_libraries(SideBySideRenderWindowsQt ${VTK_LIBRARIES})
    endif()

### Download and Build SideBySideRenderWindowsQt

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

     cd SideBySideRenderWindowsQt/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:

    ./SideBySideRenderWindowsQt

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.