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WindowModifiedEvent

vtk-examples/Cxx/Utilities/WindowModifiedEvent


Description

This example limits the horizontal window size to 400.

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

WindowModifiedEvent.cxx

#include <vtkActor.h>
#include <vtkCallbackCommand.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.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*[])
{
  vtkNew<vtkNamedColors> colors;

  // Create a sphere
  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->Update();

  // Create a mapper and actor
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(sphereSource->GetOutputPort());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("Peacock").GetData());

  // Create a renderer, render window, and interactor
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("WindowModifiedEvent");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Add the actor to the scene
  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("MistyRose").GetData());

  vtkNew<vtkCallbackCommand> m_pModifiedCallback;
  m_pModifiedCallback->SetCallback(WindowModifiedCallback);
  // m_pModifiedCallback->SetClientData(this);

  renderWindow->AddObserver(vtkCommand::ModifiedEvent, m_pModifiedCallback);

  // Render and interact
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(WindowModifiedEvent)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping WindowModifiedEvent: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(WindowModifiedEvent MACOSX_BUNDLE WindowModifiedEvent.cxx )
  target_link_libraries(WindowModifiedEvent PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(WindowModifiedEvent MACOSX_BUNDLE WindowModifiedEvent.cxx )
  target_link_libraries(WindowModifiedEvent PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS WindowModifiedEvent
    MODULES ${VTK_LIBRARIES}
    )
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

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