InteractorStyleUser

VTKEx/Cxx/Interaction/InteractorStyleUser

Description

This style is designed to NOT provide any default functionality. You must specify how to handle every event that you want handled.

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

InteractorStyleUser.cxx

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

static void ClickCallbackFunction ( vtkObject* caller,
                                    long unsigned int eventId,
                                    void* clientData,
                                    void* callData );

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

  // Visualize
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(sphereSource->GetOutputPort());

  vtkSmartPointer<vtkActor> actor = 
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);

  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(1,1,1); // Background color white

  renderWindow->Render();

  vtkSmartPointer<vtkCallbackCommand> clickCallback = 
    vtkSmartPointer<vtkCallbackCommand>::New();
  clickCallback->SetCallback(ClickCallbackFunction);

  renderWindowInteractor->AddObserver ( vtkCommand::LeftButtonPressEvent, clickCallback );

  vtkSmartPointer<vtkInteractorStyleUser> style = 
    vtkSmartPointer<vtkInteractorStyleUser>::New();
  renderWindowInteractor->SetInteractorStyle(style);

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}


void ClickCallbackFunction (vtkObject *,
                            long unsigned int,
                            void *,
                            void *)
{
  std::cout << "Click callback" << std::endl;

  // We can get the calling object like this:
  // vtkRenderWindowInteractor *iren = 
  //  static_cast<vtkRenderWindowInteractor*>(caller);
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(InteractorStyleUser)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkFiltersSources
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping InteractorStyleUser: ${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(InteractorStyleUser MACOSX_BUNDLE InteractorStyleUser.cxx )
  target_link_libraries(InteractorStyleUser PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(InteractorStyleUser MACOSX_BUNDLE InteractorStyleUser.cxx )
  target_link_libraries(InteractorStyleUser PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS InteractorStyleUser
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build InteractorStyleUser

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

cd InteractorStyleUser/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:

./InteractorStyleUser

WINDOWS USERS

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