VTK/Examples/Cxx/Utilities/WindowModifiedEvent

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VTK Examples Baseline Utilities TestWindowModified.png

This example limits the horizontal window size to 400.

WindowModifiedEvent.cxx

#include <vtkSphereSource.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkCallbackCommand.h>

void WindowModifiedCallback( vtkObject*
                      caller, long unsigned int vtkNotUsed(eventId), void* vtkNotUsed(clientData), void* vtkNotUsed(callData) )
{
  std::cout << "Window modified" << std::endl;
  std::cout << caller->GetClassName() << std::endl;
  
  vtkRenderWindow* window = static_cast<vtkRenderWindow*>(caller);
  int* windowSize = window->GetSize();
  std::cout << "Size: " << windowSize[0] << " " << windowSize[1] << std::endl;
  
  if(windowSize[0] > 400)
    {
    window->SetSize(400, windowSize[1]);
    window->Render();
    window->Modified();
    window->Render();
    
    }
}

int main(int, char *[])
{
  // Create a sphere
  vtkSmartPointer<vtkSphereSource> sphereSource = 
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->Update();

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(sphereSource->GetOutputPort());
  
  vtkSmartPointer<vtkActor> actor = 
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  // Create a renderer, render window, and interactor
  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Add the actor to the scene
  renderer->AddActor(actor);
  renderer->SetBackground(1,1,1); // Background color white
  
  vtkSmartPointer<vtkCallbackCommand> m_pModifiedCallback =
    vtkSmartPointer<vtkCallbackCommand>::New();
  m_pModifiedCallback->SetCallback (WindowModifiedCallback);
  //m_pModifiedCallback->SetClientData(this);

  renderWindow->AddObserver(vtkCommand::ModifiedEvent,m_pModifiedCallback);
  
  // Render and interact
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(WindowModifiedEvent)

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

add_executable(WindowModifiedEvent MACOSX_BUNDLE WindowModifiedEvent.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(WindowModifiedEvent ${VTK_LIBRARIES})
else()
  target_link_libraries(WindowModifiedEvent vtkHybrid vtkWidgets)
endif()

Download and Build WindowModifiedEvent

Click here to download WindowModifiedEvent. and its CMakeLists.txt file.

Once the tarball WindowModifiedEvent.tar has been downloaded and extracted,

cd WindowModifiedEvent/build 
  • If VTK is 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 ..

Build the project:

make

and run it:

./WindowModifiedEvent

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.