# QtBarChart

VTKExamples/Cxx/Qt/QtBarChart

### Code

QtBarChart.cxx

    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkSmartPointer.h>
    #include <vtkChartXY.h>
    #include <vtkPlot.h>
    #include <vtkTable.h>
    #include <vtkIntArray.h>
    #include <vtkContextView.h>
    #include <vtkContextScene.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkVersion.h>

    #define VTK_CREATE(type, name) \
      vtkSmartPointer<type> name = vtkSmartPointer<type>::New()

    // Monthly circulation data
    static int data_2008[] = {10822, 10941, 9979, 10370, 9460, 11228, 15093, 12231, 10160, 9816, 9384, 7892};
    static int data_2009[] = {9058, 9474, 9979, 9408, 8900, 11569, 14688, 12231, 10294, 9585, 8957, 8590};
    static int data_2010[] = {9058, 10941, 9979, 10270, 8900, 11228, 14688, 12231, 10160, 9585, 9384, 8590};

    int main(int, char*[] )
    {
      // Set up a 2D scene, add an XY chart to it
      VTK_CREATE(vtkContextView, view);
      view->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
      view->GetRenderWindow()->SetSize(400, 300);
      VTK_CREATE(vtkChartXY, chart);
      view->GetScene()->AddItem(chart);

      // Create a table with some points in it...
      VTK_CREATE(vtkTable, table);

      VTK_CREATE(vtkIntArray, arrMonth);
      arrMonth->SetName("Month");
      table->AddColumn(arrMonth);

      VTK_CREATE(vtkIntArray, arr2008);
      arr2008->SetName("2008");
      table->AddColumn(arr2008);

      VTK_CREATE(vtkIntArray, arr2009);
      arr2009->SetName("2009");
      table->AddColumn(arr2009);

      VTK_CREATE(vtkIntArray, arr2010);
      arr2010->SetName("2010");
      table->AddColumn(arr2010);

      table->SetNumberOfRows(12);
      for (int i = 0; i < 12; i++)
      {
        table->SetValue(i,0,i+1);
        table->SetValue(i,1,data_2008[i]);
        table->SetValue(i,2,data_2009[i]);
        table->SetValue(i,3,data_2010[i]);
      }

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

      line = chart->AddPlot(vtkChart::BAR);
    #if VTK_MAJOR_VERSION <= 5
      line->SetInput(table, 0, 1);
    #else
      line->SetInputData(table, 0, 1);
    #endif
      line->SetColor(0, 255, 0, 255);

      line = chart->AddPlot(vtkChart::BAR);
    #if VTK_MAJOR_VERSION <= 5
      line->SetInput(table, 0, 2);
    #else
      line->SetInputData(table, 0, 2);
    #endif
      line->SetColor(255, 0, 0, 255);

      line = chart->AddPlot(vtkChart::BAR);
    #if VTK_MAJOR_VERSION <= 5
      line->SetInput(table, 0, 3);
    #else
      line->SetInputData(table, 0, 3);
    #endif
      line->SetColor(0, 0, 255, 255);

      // 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 2.8)

    PROJECT(QtBarChart)

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

    add_executable(QtBarChart MACOSX_BUNDLE QtBarChart.cxx )

    target_link_libraries(QtBarChart ${VTK_LIBRARIES})

### Download and Build QtBarChart

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

    cd QtBarChart/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:

    ./QtBarChart

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.