# ParallelCoordinatesView

VTKExamples/Cxx/InfoVis/ParallelCoordinatesView

### Code

ParallelCoordinatesView.cxx

    #include <vtkVersion.h>

    #include <vtkSmartPointer.h>
    #include <vtkPolyData.h>
    #include <vtkDelimitedTextReader.h>
    #include <vtkTable.h>
    #include <vtkPointData.h>

    #include <vtkParallelCoordinatesView.h>
    #include <vtkParallelCoordinatesRepresentation.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>

    #include <vtkStringArray.h>
    #include <vtkDoubleArray.h>
    #include <vtkFloatArray.h>
    #include <vtkIntArray.h>

    #include <vtksys/SystemTools.hxx>

    int main(int argc, char* argv[])
    {
      vtkSmartPointer<vtkTable> table =
        vtkSmartPointer<vtkTable>::New();
      std::string title;

      if(argc > 1)
      {
        std::string inputFilename;
        inputFilename = argv[1];
        vtkSmartPointer<vtkDelimitedTextReader> reader =
          vtkSmartPointer<vtkDelimitedTextReader>::New();
        reader->SetFileName(inputFilename.c_str());
        reader->SetHaveHeaders(1);
        reader->DetectNumericColumnsOn();
        reader->SetFieldDelimiterCharacters(",");
        reader->Update();
        table = reader->GetOutput();
        title = vtksys::SystemTools::GetFilenameWithoutExtension(
          vtksys::SystemTools::GetFilenameName(inputFilename));
      }
      else
      {
        title = "Generated Data";
        vtkSmartPointer<vtkIntArray> array1 =
          vtkSmartPointer<vtkIntArray>::New();
        array1->SetName("Array1");
        array1->SetNumberOfComponents(1);
        array1->InsertNextValue(0);
        array1->InsertNextValue(1);
        array1->InsertNextValue(2);
        array1->InsertNextValue(3);
        array1->InsertNextValue(4);

        vtkSmartPointer<vtkFloatArray> array2 =
          vtkSmartPointer<vtkFloatArray>::New();
        array2->SetName("Array2");
        array2->SetNumberOfComponents(1);
        array2->InsertNextValue(-0);
        array2->InsertNextValue(-1);
        array2->InsertNextValue(-2);
        array2->InsertNextValue(-3);
        array2->InsertNextValue(-4);

        vtkSmartPointer<vtkDoubleArray> array3 =
          vtkSmartPointer<vtkDoubleArray>::New();
        array3->SetName("Array3");
        array3->SetNumberOfComponents(1);
        array3->InsertNextValue(0);
        array3->InsertNextValue(1);
        array3->InsertNextValue(4);
        array3->InsertNextValue(9);
        array3->InsertNextValue(16);

        table->AddColumn(array1);
        table->AddColumn(array2);
        table->AddColumn(array3);
      }

      vtkSmartPointer<vtkPolyData> polydata =
        vtkSmartPointer<vtkPolyData>::New();

      for (vtkIdType i = 0; i < table->GetNumberOfColumns(); ++i)
      {
        if (vtkStringArray::SafeDownCast(table->GetColumn(i)))
        {
          std::cout << i << " is "
                    << "StringArray named ";
        }
        else if (vtkDoubleArray::SafeDownCast(table->GetColumn(i)))
        {
          std::cout << i << " is "
                    << "DoubleArray named ";
        }
        else if (vtkFloatArray::SafeDownCast(table->GetColumn(i)))
        {
          std::cout << i << " is "
                    << "DoubleArray named ";
        }
        else if (vtkIntArray::SafeDownCast(table->GetColumn(i)))
        {
          std::cout << i << " is "
                    << "IntArray named ";
        }
        else
        {
          std::cout << i << " is "
                    << "Unknown type named ";
        }
        std::cout << "\"" << table->GetColumn(i)->GetName() << "\"" << std::endl;

        polydata->GetPointData()->AddArray(table->GetColumn(i));

      }

      vtkSmartPointer<vtkParallelCoordinatesRepresentation> rep =
        vtkSmartPointer<vtkParallelCoordinatesRepresentation>::New();

    #if VTK_MAJOR_VERSION <= 5
      rep->SetInputConnection(polydata->GetProducerPort());
    #else
      rep->SetInputData(polydata);
    #endif

      // List all of the attribute arrays you want plotted in parallel coordinates
      // Set up the parallel coordinates Representation to be used in the View
      for (vtkIdType i = 0; i < table->GetNumberOfColumns(); ++i)
      {
        if (vtkStringArray::SafeDownCast(table->GetColumn(i)))
        {
          continue;
        }
        else
        {
          rep->SetInputArrayToProcess(i, 0, 0, 0, table->GetColumn(i)->GetName());
        }
      }
      rep->UseCurvesOn();
      rep->SetFontSize(.5);
      rep->SetPlotTitle(title.c_str());
      rep->SetLineOpacity(0.5);
      rep->SetLineColor(0.89, 0.81, 0.3);
      rep->SetAxisColor(1.0, 0.3882, 0.2784);
      rep->SetAxisLabelColor(1, 1, 1);

      // Set up the Parallel Coordinates View and hook in the Representation
      vtkSmartPointer<vtkParallelCoordinatesView> view =
        vtkSmartPointer<vtkParallelCoordinatesView>::New();
      view->SetRepresentation(rep);
      view->SetInspectMode(1);
      view->SetDisplayHoverText(1);

      // Brush Mode determines the type of interaction you perform to select data
      view->SetBrushModeToLasso();
      view->SetBrushOperatorToReplace();

      // Set up render window
      view->GetRenderWindow()->SetSize(600,300);
      view->ResetCamera();
      view->Render();

      // Start interaction event loop
      view->GetInteractor()->Start();
      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ParallelCoordinatesView)

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

    add_executable(ParallelCoordinatesView MACOSX_BUNDLE ParallelCoordinatesView.cxx)

    target_link_libraries(ParallelCoordinatesView ${VTK_LIBRARIES})

### Download and Build ParallelCoordinatesView

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

    cd ParallelCoordinatesView/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:

    ./ParallelCoordinatesView

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.