# DataAnimationSubclass

VTKExamples/Cxx/Utilities/DataAnimationSubclass

### Code

DataAnimationSubclass.cxx

    #include <vtkSmartPointer.h>
    #include <vtkObjectFactory.h>
    #include <vtkSphereSource.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkProgrammableFilter.h>
    #include <vtkCommand.h>

    class CommandSubclass : public vtkCommand
    {
      public:
      vtkTypeMacro(CommandSubclass, vtkCommand);
      static CommandSubclass *New()
      {
        return new CommandSubclass;
      }

      void Execute(vtkObject *caller, unsigned long vtkNotUsed(eventId),
                           void *vtkNotUsed(callData))
      {
        std::cout << "timer callback" << std::endl;

        vtkRenderWindowInteractor *iren =
          static_cast<vtkRenderWindowInteractor*>(caller);

        this->ProgrammableFilter->Modified();

        iren->Render();

      }

      vtkSmartPointer<vtkProgrammableFilter> ProgrammableFilter;

    };

    unsigned int counter; //global

    void AdjustPoints(void* arguments)
    {
      std::cout << "AdjustPoints" << std::endl;
      vtkProgrammableFilter* programmableFilter =
          static_cast<vtkProgrammableFilter*>(arguments);

      vtkPoints* inPts = programmableFilter->GetPolyDataInput()->GetPoints();
      vtkIdType numPts = inPts->GetNumberOfPoints();
      vtkSmartPointer<vtkPoints> newPts =
          vtkSmartPointer<vtkPoints>::New();
      newPts->SetNumberOfPoints(numPts);

      for(vtkIdType i = 0; i < numPts; i++)
      {
        double p[3];
        inPts->GetPoint(i, p);
        newPts->SetPoint(i, p);
      }

      double p0[3];
      inPts->GetPoint(0, p0);
      p0[2] = p0[2] + counter * 0.1;
      newPts->SetPoint(0, p0);

      programmableFilter->GetPolyDataOutput()->CopyStructure(programmableFilter->GetPolyDataInput());
      programmableFilter->GetPolyDataOutput()->SetPoints(newPts);
      counter++;
    }

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

      vtkSmartPointer<vtkProgrammableFilter> programmableFilter =
        vtkSmartPointer<vtkProgrammableFilter>::New();
      programmableFilter->SetInputConnection(sphereSource->GetOutputPort());
      programmableFilter->SetExecuteMethod(AdjustPoints, programmableFilter);

      // Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(programmableFilter->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);

      // Initialize must be called prior to creating timer events.
      renderWindowInteractor->Initialize();
      renderWindowInteractor->CreateRepeatingTimer(500);

      vtkSmartPointer<CommandSubclass> timerCallback =
        vtkSmartPointer<CommandSubclass>::New();
      timerCallback->ProgrammableFilter = programmableFilter;

      renderWindowInteractor->AddObserver ( vtkCommand::TimerEvent, timerCallback );

      // Add the actor to the scene
      renderer->AddActor(actor);
      renderer->SetBackground(1,1,1); // Background color white

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(DataAnimationSubclass)

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

    add_executable(DataAnimationSubclass MACOSX_BUNDLE DataAnimationSubclass.cxx )

    target_link_libraries(DataAnimationSubclass ${VTK_LIBRARIES})

### Download and Build DataAnimationSubclass

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

    cd DataAnimationSubclass/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:

    ./DataAnimationSubclass

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.