ShareCameraQt

Code¶

ShareCameraQt.cxx

#include "ShareCameraQt.h"

#include <vtkCamera.h>
#include <vtkCommand.h>
#include <vtkCubeSource.h>
#include <vtkDataObjectToTable.h>
#include <vtkElevationFilter.h>
#include <vtkGenericOpenGLRenderWindow.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkQtTableView.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>

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

  vtkNew<vtkNamedColors> colors;

  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);
  sphereActor->GetProperty()->SetColor(colors->GetColor4d("Tomato").GetData());

  // 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);
  cubeActor->GetProperty()->SetColor(
      colors->GetColor4d("MediumSeaGreen").GetData());

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

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

  // Add Actor to renderer
  rightRenderer->AddActor(cubeActor);
  rightRenderer->SetBackground(colors->GetColor3d("LightSteelBlue").GetData());

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

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

  // Here we share the camera
  rightRenderer->SetActiveCamera(leftRenderer->GetActiveCamera());

  // Position the cube using the left renderer active camera
  leftRenderer->GetActiveCamera()->SetPosition(1.0, 0.8, 1.0);
  leftRenderer->GetActiveCamera()->SetFocalPoint(0, 0, 0);
  leftRenderer->ResetCamera();
  leftRenderer->GetActiveCamera()->Zoom(0.8);

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

  this->qvtkWidgetLeft->GetRenderWindow()->AddObserver(
      vtkCommand::ModifiedEvent, 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 <QVTKOpenGLNativeWidget.h>

#include "ShareCameraQt.h"

int main( int argc, char** argv )
{
  // needed to ensure appropriate OpenGL context is created for VTK rendering.
  QSurfaceFormat::setDefaultFormat(QVTKOpenGLNativeWidget::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="QVTKOpenGLNativeWidget" name="qvtkWidgetLeft">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>20</y>
      <width>511</width>
      <height>541</height>
     </rect>
    </property>
   </widget>
   <widget class="QVTKOpenGLNativeWidget" 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>QVTKOpenGLNativeWidget</class>
   <extends>QWidget</extends>
   <header>QVTKOpenGLNativeWidget.h</header>
  </customwidget>
 </customwidgets>
 <resources>
  <include location="Icons/icons.qrc"/>
 </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(ShareCameraQt)

find_package(VTK COMPONENTS

  vtkCommonColor
  vtkCommonCore
  vtkFiltersCore
  vtkFiltersSources
  vtkInfovisCore
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  vtkViewsQt
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping ShareCameraQt: ${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(ShareCameraQt MACOSX_BUNDLE
    ${CXX_FILES} ${UISrcs} ${QT_WRAP})
  qt5_use_modules(ShareCameraQt Core Gui)
  target_link_libraries(ShareCameraQt ${VTK_LIBRARIES})
else()
  # 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})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ShareCameraQt
    MODULES ${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.