# StackedPlot

VTKExamples/Cxx/Plotting/StackedPlot

### Code

StackedPlot.cxx

    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkSmartPointer.h>
    #include <vtkChartXY.h>
    #include <vtkPlot.h>
    #include <vtkAxis.h>
    #include <vtkPlotStacked.h>
    #include <vtkColor.h>
    #include <vtkColorSeries.h>
    #include <vtkTable.h>
    #include <vtkIntArray.h>
    #include <vtkDoubleArray.h>
    #include <vtkStringArray.h>
    #include <vtkContextView.h>
    #include <vtkContextScene.h>
    #include <vtkRenderWindowInteractor.h>

    // Monthly checkout data
    static const char *month_labels[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
                                         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
    static int book[] =       {5675, 5902, 6388, 5990, 5575, 7393, 9878, 8082, 6417, 5946, 5526, 5166};
    static int new_popular[] = {701,  687,  736,  696,  750,  814,  923,  860,  786,  735,  680,  741};
    static int periodical[] =  {184,  176,  166,  131,  171,  191,  231,  166,  197,  162,  152,  143};
    static int audiobook[] =   {903, 1038,  987, 1073, 1144, 1203, 1173, 1196, 1213, 1076,  926,  874};
    static int video[] =      {1524, 1565, 1627, 1445, 1179, 1816, 2293, 1811, 1588, 1561, 1542, 1563};

    //----------------------------------------------------------------------------
    int main(int, char*[])
    {
      // Set up a 2D scene, add an XY chart to it
      vtkSmartPointer<vtkContextView> view =
        vtkSmartPointer<vtkContextView>::New();
      view->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
      view->GetRenderWindow()->SetSize(400, 300);
      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<vtkStringArray> arrMonthLabel =
        vtkSmartPointer<vtkStringArray>::New();
      arrMonthLabel->SetNumberOfValues(12);

      vtkSmartPointer<vtkDoubleArray> arrXTickPositions =
        vtkSmartPointer<vtkDoubleArray>::New();
      arrXTickPositions->SetNumberOfValues(12);

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

      vtkSmartPointer<vtkIntArray> arrBook =
        vtkSmartPointer<vtkIntArray>::New();
      arrBook->SetName("Books");
      table->AddColumn(arrBook);

      vtkSmartPointer<vtkIntArray> arrNewPopularBook =
        vtkSmartPointer<vtkIntArray>::New();
      arrNewPopularBook->SetName("New / Popular");
      table->AddColumn(arrNewPopularBook);

      vtkSmartPointer<vtkIntArray> arrPeriodical =
        vtkSmartPointer<vtkIntArray>::New();
      arrPeriodical->SetName("Periodical");
      table->AddColumn(arrPeriodical);

      vtkSmartPointer<vtkIntArray> arrAudiobook =
        vtkSmartPointer<vtkIntArray>::New();
      arrAudiobook->SetName("Audiobook");
      table->AddColumn(arrAudiobook);

      vtkSmartPointer<vtkIntArray> arrVideo =
        vtkSmartPointer<vtkIntArray>::New();
      arrVideo->SetName("Video");
      table->AddColumn(arrVideo);

      table->SetNumberOfRows(12);
      for (int i = 0; i < 12; i++)
      {
        arrMonthLabel->SetValue(i,month_labels[i]);
        arrXTickPositions->SetValue(i,i);

        arrBook->SetValue(i,book[i]);
        arrNewPopularBook->SetValue(i,new_popular[i]);
        arrPeriodical->SetValue(i,periodical[i]);
        arrAudiobook->SetValue(i,audiobook[i]);
        arrVideo->SetValue(i,video[i]);
      }

      // Set the Month Labels
      chart->GetAxis(1)->SetCustomTickPositions(arrXTickPositions, arrMonthLabel);
      chart->GetAxis(1)->SetMaximum(11);

      chart->GetAxis(1)->SetRange(0, 11);
      chart->GetAxis(1)->SetBehavior(vtkAxis::FIXED);
      chart->GetAxis(1)->SetTitle("Month");

      chart->SetShowLegend(true);

      chart->GetAxis(0)->SetTitle("Checkouts");

      // Add multiple line plots, setting the colors etc
      vtkPlotStacked *stack = 0;

      // Books
      stack = vtkPlotStacked::SafeDownCast(chart->AddPlot(vtkChart::STACKED));
      stack->SetUseIndexForXSeries(true);
      stack->SetInputData(table);
      stack->SetInputArray(1,"Books");
      stack->SetInputArray(2,"New / Popular");
      stack->SetInputArray(3,"Periodical");
      stack->SetInputArray(4,"Audiobook");
      stack->SetInputArray(5,"Video");

      vtkSmartPointer<vtkColorSeries> colorSeries =
        vtkSmartPointer<vtkColorSeries>::New();
      colorSeries->SetColorScheme(vtkColorSeries::WILD_FLOWER);
      stack->SetColorSeries(colorSeries);

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

      view->GetInteractor()->Initialize();
      view->GetInteractor()->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(StackedPlot)

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

### Download and Build StackedPlot

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

    cd StackedPlot/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:

    ./StackedPlot

WINDOWS USERS

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