# XGMLReader

VTKExamples/Cxx/InfoVis/XGMLReader

### Description

This example reads and displays the graph from a gml file. You can test this with VTKData/Data/Infovis/fsm.gml.

### Code

XGMLReader.cxx

    #include <vtkPolyData.h>
    #include <vtkXGMLReader.h>
    #include <vtkSmartPointer.h>
    #include <vtkUndirectedGraph.h>
    #include <vtkGraphLayoutStrategy.h>
    #include <vtkGraphLayoutView.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkSimple2DLayoutStrategy.h>

    int main(int argc, char *argv[])
    {
      if(argc != 2)
      {
        std::cout << "Required parameters: Filename" << std::endl;
        return EXIT_FAILURE;
      }

      std::string inputFilename = argv[1];

      vtkSmartPointer<vtkXGMLReader> reader =
        vtkSmartPointer<vtkXGMLReader>::New();
      reader->SetFileName(inputFilename.c_str());
      reader->Update();

      vtkUndirectedGraph* g = reader->GetOutput();

      vtkSmartPointer<vtkGraphLayoutView> graphLayoutView =
        vtkSmartPointer<vtkGraphLayoutView>::New();
      graphLayoutView->AddRepresentationFromInput(g);
      graphLayoutView->SetLayoutStrategy("Simple 2D");
      graphLayoutView->ResetCamera();
      graphLayoutView->Render();

      graphLayoutView->GetInteractor()->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(XGMLReader)

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

    add_executable(XGMLReader MACOSX_BUNDLE XGMLReader.cxx )

    target_link_libraries(XGMLReader ${VTK_LIBRARIES})

### Download and Build XGMLReader

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

    cd XGMLReader/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:

    ./XGMLReader

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.