# BandedPolyDataContourFilter

VTKExamples/Cxx/VisualizationAlgorithms/BandedPolyDataContourFilter

### Code

BandedPolyDataContourFilter.cxx

    #include <vtkSmartPointer.h>
    #include <vtkBandedPolyDataContourFilter.h>

    #include <vtkCellArray.h>
    #include <vtkFloatArray.h>
    #include <vtkPointData.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkCamera.h>
    #include <vtkNamedColors.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      vtkSmartPointer<vtkPoints> pts =
        vtkSmartPointer<vtkPoints>::New();
      pts->InsertPoint( 0,  0, 0, 0);
      pts->InsertPoint( 1,  0, 1, 0);
      pts->InsertPoint( 2,  0, 2, 0);
      pts->InsertPoint( 3,  1, 0, 0);
      pts->InsertPoint( 4,  1, 1, 0);
      pts->InsertPoint( 5,  1, 2, 0);
      pts->InsertPoint( 6,  2, 0, 0);
      pts->InsertPoint( 7,  2, 2, 0);
      pts->InsertPoint( 8,  3, 0, 0);
      pts->InsertPoint( 9,  3, 1, 0);
      pts->InsertPoint( 10, 3, 2, 0 );
      pts->InsertPoint( 11, 4, 0, 0);
      pts->InsertPoint( 12, 6, 0, 0 );
      pts->InsertPoint( 13, 5, 2, 0 );
      pts->InsertPoint( 14, 7, 0, 0);
      pts->InsertPoint( 15, 9, 0, 0 );
      pts->InsertPoint( 16, 7, 2, 0 );
      pts->InsertPoint( 17, 9, 2, 0 );
      pts->InsertPoint( 18, 10, 0, 0);
      pts->InsertPoint( 19, 12, 0, 0 );
      pts->InsertPoint( 20, 10, 1, 0 );
      pts->InsertPoint( 21, 12, 1, 0 );
      pts->InsertPoint( 22, 10, 2, 0 );
      pts->InsertPoint( 23, 12, 2, 0 );
      pts->InsertPoint( 24, 10, 3, 0 );
      pts->InsertPoint( 25, 12, 3, 0);

      vtkSmartPointer<vtkCellArray> polys =
        vtkSmartPointer<vtkCellArray>::New();
      polys->InsertNextCell( 4);
      polys->InsertCellPoint( 14);
      polys->InsertCellPoint( 15);
      polys->InsertCellPoint( 17);
      polys->InsertCellPoint( 16);
      polys->InsertNextCell( 3);
      polys->InsertCellPoint( 11);
      polys->InsertCellPoint( 12);
      polys->InsertCellPoint( 13);

      vtkSmartPointer<vtkFloatArray> scalars =
        vtkSmartPointer<vtkFloatArray>::New();
      scalars->SetNumberOfTuples (26);
      scalars->SetTuple1( 0, 0);
      scalars->SetTuple1( 1, 50);
      scalars->SetTuple1( 2, 100);
      scalars->SetTuple1( 3, 0);
      scalars->SetTuple1( 4, 50);
      scalars->SetTuple1( 5, 100);
      scalars->SetTuple1( 6, 10);
      scalars->SetTuple1( 7, 90);
      scalars->SetTuple1( 8, 10);
      scalars->SetTuple1( 9, 50);
      scalars->SetTuple1( 10, 90);
      scalars->SetTuple1( 11, 10);
      scalars->SetTuple1( 12, 40);
      scalars->SetTuple1( 13, 100);
      scalars->SetTuple1( 14, 0);
      scalars->SetTuple1( 15, 60);
      scalars->SetTuple1( 16, 40);
      scalars->SetTuple1( 17, 100);
      scalars->SetTuple1( 18, 0);
      scalars->SetTuple1( 19, 25);
      scalars->SetTuple1( 20, 25);
      scalars->SetTuple1( 21, 50);
      scalars->SetTuple1( 22, 50);
      scalars->SetTuple1( 23, 75);
      scalars->SetTuple1( 24, 75);
      scalars->SetTuple1( 25, 100);

      vtkSmartPointer<vtkPolyData> polyData =
        vtkSmartPointer<vtkPolyData>::New();
      polyData->SetPoints(pts);
      polyData->SetPolys(polys);
      polyData->GetPointData()->SetScalars(scalars);

      vtkSmartPointer<vtkBandedPolyDataContourFilter> bf =
        vtkSmartPointer<vtkBandedPolyDataContourFilter>::New();
      bf->SetInputData (polyData);
      bf->GenerateValues(5, 25, 75 );

      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(bf->GetOutputPort());
      mapper->SetScalarModeToUseCellData();
      mapper->SetScalarRange (0, 4);
      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);

      // Create the RenderWindow, Renderer and both Actors

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

      // Add the actors to the renderer, set the background and size
      renderer->AddActor(actor);

      renderWindow->SetSize (1200, 400);
      renderWindow->Render();
      renderer->GetActiveCamera()->Zoom(3);
      renderer->SetBackground(colors->GetColor3d("Melon").GetData());
      renderWindow->Render();
      interactor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(BandedPolyDataContourFilter)

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

    add_executable(BandedPolyDataContourFilter MACOSX_BUNDLE BandedPolyDataContourFilter.cxx )

    target_link_libraries(BandedPolyDataContourFilter ${VTK_LIBRARIES})

### Download and Build BandedPolyDataContourFilter

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

    cd BandedPolyDataContourFilter/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:

    ./BandedPolyDataContourFilter

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.