# FilterSelfProgress

VTKExamples/Cxx/Developers/FilterSelfProgress

### Code

FilterSelfProgress.cxx

    #include <vtkSmartPointer.h>
    #include <vtkPoints.h>
    #include <vtkPolyData.h>
    #include <vtkSphereSource.h>
    #include <vtkCallbackCommand.h>
    #include <vtkCommand.h>

    #include "vtkTestFilterSelfProgressFilter.h"

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

    int main(int /* argc */, char ** /* argv */)
    {
      vtkSmartPointer<vtkSphereSource> sphereSource =
          vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();

      vtkSmartPointer<vtkTestFilterSelfProgressFilter> testFilter =
          vtkSmartPointer<vtkTestFilterSelfProgressFilter>::New();
      testFilter->SetInputConnection(sphereSource->GetOutputPort());
      testFilter->Update();

      return EXIT_SUCCESS;
    }

vtkTestFilterSelfProgressFilter.h

    #ifndef __vtkTestFilterSelfProgressFilter_h
    #define __vtkTestFilterSelfProgressFilter_h

    #include <vtkPolyDataAlgorithm.h>

    class vtkTestFilterSelfProgressFilter : public vtkPolyDataAlgorithm
    {
    public:
      vtkTypeMacro(vtkTestFilterSelfProgressFilter,vtkAlgorithm);

      static vtkTestFilterSelfProgressFilter *New();

    protected:
      vtkTestFilterSelfProgressFilter();
      ~vtkTestFilterSelfProgressFilter() {}

      int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) override;

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

    private:
      vtkTestFilterSelfProgressFilter(const vtkTestFilterSelfProgressFilter&) = delete;
      void operator=(const vtkTestFilterSelfProgressFilter&) = delete;

    };

    #endif

vtkTestFilterSelfProgressFilter.cxx

    #include <vtkSmartPointer.h>

    #include <vtkObjectFactory.h>
    #include <vtkStreamingDemandDrivenPipeline.h>
    #include <vtkInformationVector.h>
    #include <vtkInformation.h>
    #include <vtkDataObject.h>
    #include <vtkCallbackCommand.h>

    #include "vtkTestFilterSelfProgressFilter.h"

    vtkStandardNewMacro(vtkTestFilterSelfProgressFilter);

    vtkTestFilterSelfProgressFilter::vtkTestFilterSelfProgressFilter()
    {
      vtkSmartPointer<vtkCallbackCommand> progressCallback =
          vtkSmartPointer<vtkCallbackCommand>::New();
      progressCallback->SetCallback(this->ProgressFunction);

      this->AddObserver(vtkCommand::ProgressEvent, progressCallback);
    }

    void vtkTestFilterSelfProgressFilter::ProgressFunction(vtkObject* caller, long unsigned int /* eventId */, void* /* clientData */, void* /* callData */)
    {
      vtkTestFilterSelfProgressFilter* testFilter = static_cast<vtkTestFilterSelfProgressFilter*>(caller);
      cout << "Progress: " << testFilter->GetProgress() << endl;
    }

    int vtkTestFilterSelfProgressFilter::RequestData(vtkInformation *vtkNotUsed(request),
                                                 vtkInformationVector **inputVector,
                                                 vtkInformationVector *outputVector)
    {

      // get the info objects
      vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
      vtkInformation *outInfo = outputVector->GetInformationObject(0);

      // get the input and ouptut
      vtkPolyData *input = vtkPolyData::SafeDownCast(
          inInfo->Get(vtkDataObject::DATA_OBJECT()));

      vtkPolyData *output = vtkPolyData::SafeDownCast(
          outInfo->Get(vtkDataObject::DATA_OBJECT()));

      for(vtkIdType i = 0; i < input->GetNumberOfPoints(); i++)
        {
        this->UpdateProgress(static_cast<double>(i)/input->GetNumberOfPoints());
        }

      output->ShallowCopy(input);

      return 1;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(FilterSelfProgress)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkFiltersSources QUIET)
    if (NOT VTK_FOUND)
      message("Skipping FilterSelfProgress: ${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(FilterSelfProgress MACOSX_BUNDLE FilterSelfProgress.cxx )
      target_link_libraries(FilterSelfProgress PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(FilterSelfProgress MACOSX_BUNDLE FilterSelfProgress.cxx )
      target_link_libraries(FilterSelfProgress PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS FilterSelfProgress
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build FilterSelfProgress

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

    cd FilterSelfProgress/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:

    ./FilterSelfProgress

WINDOWS USERS

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