# StackedBar

VTKExamples/Cxx/Plotting/StackedBar

### Code

StackedBar.cxx

    #include <vtkSmartPointer.h>

    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkChartXY.h>
    #include <vtkChartLegend.h>
    #include <vtkPlotBar.h>
    #include <vtkAxis.h>
    #include <vtkTable.h>
    #include <vtkIntArray.h>
    #include <vtkDoubleArray.h>
    #include <vtkStringArray.h>
    #include <vtkTextProperty.h>
    #include <vtkContextView.h>
    #include <vtkContextScene.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkColorSeries.h>

    const int num_months = 12;

    static const int month[] = {1,2,3,4,5,6,7,8,9,10,11,12};

    static const int book_2008[] =  {5675, 5902, 6388, 5990, 5575, 7393, 9878, 8082, 6417, 5946, 5526, 5166};
    static const int new_popular_2008[] =  {701, 687, 736, 696, 750, 814, 923, 860, 786, 735, 680, 741};
    static const int periodical_2008[] =  {184, 176, 166, 131, 171, 191, 231, 166, 197, 162, 152, 143};
    static const int audiobook_2008[] =  {903, 1038, 987, 1073, 1144, 1203, 1173, 1196, 1213, 1076, 926, 874};
    static const int video_2008[] =  {1524, 1565, 1627, 1445, 1179, 1816, 2293, 1811, 1588, 1561, 1542, 1563};

    static const int book_2009[] =  {6388, 5990, 5575, 9878, 8082, 5675, 7393, 5902, 5526, 5166, 5946, 6417};
    static const int new_popular_2009[] =  {696, 735, 786, 814, 736, 860, 750, 687, 923, 680, 741, 701};
    static const int periodical_2009[] =  {197, 166, 176, 231, 171, 152, 166, 131, 184, 191, 143, 162};
    static const int audiobook_2009[] =  {1213, 1076, 926, 987, 903, 1196, 1073, 1144, 1203, 1038, 874, 1173};
    static const int video_2009[] =  {2293, 1561, 1542, 1627, 1588, 1179, 1563, 1445, 1811, 1565, 1524, 1816};

    static void build_array(const char *name, vtkIntArray *array, const int c_array[])
    {
      array->SetName(name);
      for (int i = 0; i < num_months; ++i)
      {
        array->InsertNextValue(c_array[i]);
      }
    }

    //----------------------------------------------------------------------------
    int main(int , char * [])
    {
      // Set up a 2D scene, add an XY chart to it
      vtkSmartPointer<vtkContextView> view =
        vtkSmartPointer<vtkContextView>::New();
      view->GetRenderWindow()->SetSize(500, 350);
      vtkSmartPointer<vtkChartXY> chart =
        vtkSmartPointer<vtkChartXY>::New();
      view->GetScene()->AddItem(chart);

      // Create a table with some points in it...
      vtkSmartPointer<vtkTable> table =
        vtkSmartPointer<vtkTable>::New();

      vtkSmartPointer<vtkIntArray> arrMonth =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Month", arrMonth, month);
      table->AddColumn(arrMonth);

      vtkSmartPointer<vtkIntArray> arrBooks2008 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Books 2008", arrBooks2008, book_2008);
      table->AddColumn(arrBooks2008);
      vtkSmartPointer<vtkIntArray>arrNewPopular2008 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("New / Popular 2008", arrNewPopular2008, new_popular_2008);
      table->AddColumn(arrNewPopular2008);
      vtkSmartPointer<vtkIntArray>arrPeriodical2008 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Periodical 2008", arrPeriodical2008, periodical_2008);
      table->AddColumn(arrPeriodical2008);
      vtkSmartPointer<vtkIntArray>arrAudiobook2008 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Audiobook 2008", arrAudiobook2008, audiobook_2008);
      table->AddColumn(arrAudiobook2008);
      vtkSmartPointer<vtkIntArray> arrVideo2008 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Video 2008", arrVideo2008, video_2008);
      table->AddColumn(arrVideo2008);

      vtkSmartPointer<vtkIntArray>arrBooks2009 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Books 2009", arrBooks2009, book_2009);
      table->AddColumn(arrBooks2009);
      vtkSmartPointer<vtkIntArray> arrNewPopular2009 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("New / Popular 2009", arrNewPopular2009, new_popular_2009);
      table->AddColumn(arrNewPopular2009);
      vtkSmartPointer<vtkIntArray> arrPeriodical2009 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Periodical 2009", arrPeriodical2009, periodical_2009);
      table->AddColumn(arrPeriodical2009);
      vtkSmartPointer<vtkIntArray>arrAudiobook2009 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Audiobook 2009", arrAudiobook2009, audiobook_2009);
      table->AddColumn(arrAudiobook2009);
      vtkSmartPointer<vtkIntArray> arrVideo2009 =
        vtkSmartPointer<vtkIntArray>::New();
      build_array("Video 2009", arrVideo2009, video_2009);
      table->AddColumn(arrVideo2009);

      // Create a color series to use with our stacks.
      vtkSmartPointer<vtkColorSeries> colorSeries1 =
        vtkSmartPointer<vtkColorSeries>::New();
      colorSeries1->SetColorScheme(vtkColorSeries::WILD_FLOWER);

      // Add multiple line plots, setting the colors etc
      vtkPlotBar *bar = 0;

      bar = vtkPlotBar::SafeDownCast(chart->AddPlot(vtkChart::BAR));
      bar->SetColorSeries(colorSeries1);
      bar->SetInputData(table, "Month", "Books 2008");
      bar->SetInputArray(2,"New / Popular 2008");
      bar->SetInputArray(3,"Periodical 2008");
      bar->SetInputArray(4,"Audiobook 2008");
      bar->SetInputArray(5,"Video 2008");

      vtkSmartPointer<vtkColorSeries> colorSeries2 =
        vtkSmartPointer<vtkColorSeries>::New();
      colorSeries2->SetColorScheme(vtkColorSeries::WILD_FLOWER);

      bar = vtkPlotBar::SafeDownCast(chart->AddPlot(vtkChart::BAR));
      bar->SetColorSeries(colorSeries2);
      bar->SetInputData(table, "Month", "Books 2009");
      bar->SetInputArray(2,"New / Popular 2009");
      bar->SetInputArray(3,"Periodical 2009");
      bar->SetInputArray(4,"Audiobook 2009");
      bar->SetInputArray(5,"Video 2009");

      chart->SetShowLegend(true);
      vtkAxis *axis = chart->GetAxis(vtkAxis::BOTTOM);
      axis->SetBehavior(1);
      axis->SetMaximum(13.0);
      axis->SetTitle("Month");
      chart->GetAxis(vtkAxis::LEFT)->SetTitle("");
      chart->SetTitle("Circulation 2008, 2009");

      // Set up the legend to be off to the top right of the viewport.
      chart->GetLegend()->SetInline(false);
      chart->GetLegend()->SetHorizontalAlignment(vtkChartLegend::RIGHT);
      chart->GetLegend()->SetVerticalAlignment(vtkChartLegend::TOP);

      // Set up some custom labels for months.
      vtkSmartPointer<vtkDoubleArray> dates =
          vtkSmartPointer<vtkDoubleArray>::New();
      vtkSmartPointer<vtkStringArray> strings =
          vtkSmartPointer<vtkStringArray>::New();
      dates->InsertNextValue(1);
      strings->InsertNextValue("January");
      dates->InsertNextValue(2);
      strings->InsertNextValue("February");
      dates->InsertNextValue(3);
      strings->InsertNextValue("March");
      dates->InsertNextValue(4);
      strings->InsertNextValue("April");
      dates->InsertNextValue(5);
      strings->InsertNextValue("May");
      dates->InsertNextValue(6);
      strings->InsertNextValue("June");
      dates->InsertNextValue(7);
      strings->InsertNextValue("July");
      dates->InsertNextValue(8);
      strings->InsertNextValue("August");
      dates->InsertNextValue(9);
      strings->InsertNextValue("September");
      dates->InsertNextValue(10);
      strings->InsertNextValue("October");
      dates->InsertNextValue(11);
      strings->InsertNextValue("November");
      dates->InsertNextValue(12);
      strings->InsertNextValue("December");
      axis->SetCustomTickPositions(dates, strings);
      axis->GetLabelProperties()->SetOrientation(90);
      axis->GetLabelProperties()->SetVerticalJustification(VTK_TEXT_CENTERED);
      axis->GetLabelProperties()->SetJustification(VTK_TEXT_RIGHT);

      //Finally render the scene and compare the image to a reference image
      view->GetRenderWindow()->SetMultiSamples(0);
      view->GetRenderWindow()->Render();
      view->GetInteractor()->Initialize();
      view->GetInteractor()->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(StackedBar)

    find_package(VTK COMPONENTS
      vtkChartsCore
      vtkCommonColor
      vtkCommonCore
      vtkCommonDataModel
      vtkInteractionStyle
      vtkRenderingContext2D
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2
      vtkViewsContext2D QUIET)
    if (NOT VTK_FOUND)
      message("Skipping StackedBar: ${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(StackedBar MACOSX_BUNDLE StackedBar.cxx )
      target_link_libraries(StackedBar PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(StackedBar MACOSX_BUNDLE StackedBar.cxx )
      target_link_libraries(StackedBar PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS StackedBar
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build StackedBar

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

    cd StackedBar/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:

    ./StackedBar

WINDOWS USERS

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