# TreeMapView

VTKExamples/Cxx/InfoVis/TreeMapView

### Description

Fix: use a much simpler tree and generate the tree in the code instead of reading files.

### Code

TreeMapView.cxx

    #include <vtkDataRepresentation.h>
    #include <vtkRenderWindow.h>
    #include <vtkRegressionTestImage.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkTestUtilities.h>
    #include <vtkTreeMapView.h>
    #include <vtkViewTheme.h>
    #include <vtkXMLTreeReader.h>
    #include <vtkSmartPointer.h>
    #include <vtkTesting.h>

    int main(int argc, char* argv[])
    {
      vtkSmartPointer<vtkTesting> testHelper =
        vtkSmartPointer<vtkTesting>::New();
      testHelper->AddArguments(argc,const_cast<const char **>(argv));
      std::string dataRoot = testHelper->GetDataRoot();
      std::string treeFileName = dataRoot + "/Data/Infovis/XML/vtkclasses.xml";
      std::string graphFileName = dataRoot + "/Data/Infovis/XML/vtklibrary.xml";

      if (argc > 2)
      {
        treeFileName = argv[1];  // vtkclasses.xml
        graphFileName = argv[2]; // vtklibrary.xml
      }

      // We need to put the graph and tree edges in different domains.
      vtkSmartPointer<vtkXMLTreeReader> reader1 =
        vtkSmartPointer<vtkXMLTreeReader>::New();
      reader1->SetFileName(treeFileName.c_str());
      reader1->SetEdgePedigreeIdArrayName("tree edge");
      reader1->GenerateVertexPedigreeIdsOff();
      reader1->SetVertexPedigreeIdArrayName("id");

      vtkSmartPointer<vtkXMLTreeReader> reader2 =
        vtkSmartPointer<vtkXMLTreeReader>::New();
      reader2->SetFileName(graphFileName.c_str());
      reader2->SetEdgePedigreeIdArrayName("graph edge");
      reader2->GenerateVertexPedigreeIdsOff();
      reader2->SetVertexPedigreeIdArrayName("id");

      reader1->Update();
      reader2->Update();

      vtkSmartPointer<vtkTreeMapView> view =
        vtkSmartPointer<vtkTreeMapView>::New();
      view->DisplayHoverTextOff();
      view->SetTreeFromInputConnection(reader2->GetOutputPort());
      view->SetGraphFromInputConnection(reader1->GetOutputPort());

      view->SetAreaColorArrayName("level");
      view->SetEdgeColorToSplineFraction();
      view->SetColorEdges(true);
      view->SetAreaLabelArrayName("id");
      view->SetAreaHoverArrayName("id");
      view->SetAreaLabelVisibility(true);
      view->SetAreaSizeArrayName("VertexDegree");

      // Apply a theme to the views
      vtkViewTheme* const theme = vtkViewTheme::CreateMellowTheme();
      view->ApplyViewTheme(theme);
      theme->Delete();

      view->GetRenderWindow()->SetMultiSamples(0);
      view->GetRenderWindow()->SetAlphaBitPlanes(1);
      view->Update();
      view->ResetCamera();

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(TreeMapView)

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

    add_executable(TreeMapView MACOSX_BUNDLE TreeMapView.cxx )

    target_link_libraries(TreeMapView ${VTK_LIBRARIES})

### Download and Build TreeMapView

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

    cd TreeMapView/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:

    ./TreeMapView

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.