# ShareCameraQt

VTKExamples/Cxx/Qt/ShareCameraQt

### Code

ShareCameraQt.cxx

    #include "ShareCameraQt.h"

    #include <vtkCommand.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
    ShareCameraQt::ShareCameraQt()
    {
      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);

      rightRenderer->ResetCamera();
      leftRenderer->ResetCamera();

      rightRenderer->SetActiveCamera(leftRenderer->GetActiveCamera());

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

      //this->qvtkWidgetLeft->GetRenderWindow()->AddObserver(vtkCommand::ModifiedEvent, this, &ShareCameraQt::ModifiedHandler);
      this->qvtkWidgetLeft->GetRenderWindow()->AddObserver(vtkCommand::AnyEvent, this, &ShareCameraQt::ModifiedHandler);

    }

    void ShareCameraQt::ModifiedHandler()
    {
      this->qvtkWidgetRight->GetRenderWindow()->Render();
    }

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

ShareCameraQt.h

    #ifndef ShareCameraQt_H
    #define ShareCameraQt_H

    #include <QMainWindow>
    #include "ui_ShareCameraQt.h"

    class ShareCameraQt : public QMainWindow, public Ui::ShareCameraQt
    {
      Q_OBJECT
    public:

      // Constructor/Destructor
      ShareCameraQt();
      ~ShareCameraQt() {};

    public slots:

      virtual void slotExit();

    protected:
       void ModifiedHandler();
    };

    #endif

ShareCameraQtDriver.cxx

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

    #include "ShareCameraQt.h"

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

      // QT Stuff
      QApplication app( argc, argv );

      ShareCameraQt shareCameraQt;
      shareCameraQt.show();

      return app.exec();
    }

ShareCameraQt.ui

    <?xml version="1.0" encoding="UTF-8"?>
    <ui version="4.0">
     <class>ShareCameraQt</class>
     <widget class="QMainWindow" name="ShareCameraQt">
      <property name="geometry">
       <rect>
        <x>0</x>
        <y>0</y>
        <width>990</width>
        <height>583</height>
       </rect>
      </property>
      <property name="windowTitle">
       <string>ShareCameraQt</string>
      </property>
      <property name="windowIcon">
       <iconset resource="Icons/icons.qrc">
        <normaloff>:/Icons/help.png</normaloff>:/Icons/help.png</iconset>
      </property>
      <property name="iconSize">
       <size>
        <width>22</width>
        <height>22</height>
       </size>
      </property>
      <widget class="QWidget" name="centralwidget">
       <widget class="QVTKOpenGLWidget" name="qvtkWidgetLeft">
        <property name="geometry">
         <rect>
          <x>10</x>
          <y>20</y>
          <width>511</width>
          <height>541</height>
         </rect>
        </property>
       </widget>
       <widget class="QVTKOpenGLWidget" name="qvtkWidgetRight">
        <property name="geometry">
         <rect>
          <x>540</x>
          <y>20</y>
          <width>441</width>
          <height>541</height>
         </rect>
        </property>
       </widget>
      </widget>
      <action name="actionOpenFile">
       <property name="enabled">
        <bool>true</bool>
       </property>
       <property name="icon">
        <iconset resource="Icons/icons.qrc">
         <normaloff>:/Icons/fileopen.png</normaloff>:/Icons/fileopen.png</iconset>
       </property>
       <property name="text">
        <string>Open File...</string>
       </property>
      </action>
      <action name="actionExit">
       <property name="icon">
        <iconset>
         <normaloff/>
        </iconset>
       </property>
       <property name="text">
        <string>Exit</string>
       </property>
      </action>
      <action name="actionPrint">
       <property name="icon">
        <iconset resource="Icons/icons.qrc">
         <normaloff>:/Icons/print.png</normaloff>:/Icons/print.png</iconset>
       </property>
       <property name="text">
        <string>Print</string>
       </property>
      </action>
      <action name="actionHelp">
       <property name="icon">
        <iconset resource="Icons/icons.qrc">
         <normaloff>:/Icons/help.png</normaloff>:/Icons/help.png</iconset>
       </property>
       <property name="text">
        <string>Help</string>
       </property>
      </action>
      <action name="actionSave">
       <property name="icon">
        <iconset resource="Icons/icons.qrc">
         <normaloff>:/Icons/filesave.png</normaloff>:/Icons/filesave.png</iconset>
       </property>
       <property name="text">
        <string>Save</string>
       </property>
      </action>
     </widget>
     <customwidgets>
      <customwidget>
       <class>QVTKOpenGLWidget</class>
       <extends>QWidget</extends>
       <header>QVTKOpenGLWidget.h</header>
      </customwidget>
     </customwidgets>
     <resources>
      <include location="Icons/icons.qrc"/>
     </resources>
     <connections/>
    </ui>

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

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

    PROJECT(ShareCameraQt)

    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(ShareCameraQt MACOSX_BUNDLE
        ${CXX_FILES} ${UISrcs} ${QT_WRAP})
      qt5_use_modules(ShareCameraQt Core Gui)
      target_link_libraries(ShareCameraQt ${VTK_LIBRARIES})
    else()
      QT4_WRAP_UI(UISrcs ${UI_FILES})
      QT4_WRAP_CPP(MOCSrcs ${QT_WRAP})
      add_executable(ShareCameraQt MACOSX_BUNDLE ${CXX_FILES} ${UISrcs} ${MOCSrcs})
      target_link_libraries(ShareCameraQt ${VTK_LIBRARIES})
    endif()

### Download and Build ShareCameraQt

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

     cd ShareCameraQt/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:

    ./ShareCameraQt

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.