# FilterProgress

VTKExamples/Cxx/Developers/FilterProgress

### Code

FilterProgress.cxx

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

    #include <vtkTestFilterProgressFilter.h>

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

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

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

      return EXIT_SUCCESS;
    }

vtkTestFilterProgressFilter.h

    #ifndef __vtkTestFilterProgressFilter_h
    #define __vtkTestFilterProgressFilter_h

    #include <vtkPolyDataAlgorithm.h>

    class vtkTestFilterProgressFilter : public vtkPolyDataAlgorithm
    {
    public:
      static vtkTestFilterProgressFilter *New();
      vtkTypeMacro(vtkTestFilterProgressFilter,vtkAlgorithm);

    protected:
      vtkTestFilterProgressFilter();
      ~vtkTestFilterProgressFilter() VTK_OVERRIDE {}

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

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

    private:
      vtkTestFilterProgressFilter(const vtkTestFilterProgressFilter&) VTK_DELETE_FUNCTION;
      void operator=(const vtkTestFilterProgressFilterr&) VTK_DELETE_FUNCTION;

    };

    #endif

vtkTestFilterProgressFilter.cxx

    #include <vtkSmartPointer.h>

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

    #include "vtkTestFilterProgressFilter.h"

    vtkStandardNewMacro(vtkTestFilterProgressFilter);

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

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

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

    int vtkTestFilterProgressFilter::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 2.8)

    PROJECT(FilterProgress)

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

    add_executable(FilterProgress MACOSX_BUNDLE FilterProgress.cxx  vtkTestFilterProgressFilter.cxx)

    target_link_libraries(FilterProgress ${VTK_LIBRARIES})

### Download and Build FilterProgress

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

    cd FilterProgress/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:

    ./FilterProgress

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.