XGMLReader

VTKEx/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.

Other languages

See (CSharp)

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

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 3.3 FATAL_ERROR)

project(XGMLReader)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkIOInfovis
  vtkvtkInfovisLayout
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2
  vtkvtkViewsInfovis QUIET)
if (NOT VTK_FOUND)
  message("Skipping XGMLReader: ${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(XGMLReader MACOSX_BUNDLE XGMLReader.cxx )
  target_link_libraries(XGMLReader PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(XGMLReader MACOSX_BUNDLE XGMLReader.cxx )
  target_link_libraries(XGMLReader PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS XGMLReader
    MODULES ${VTK_LIBRARIES}
    )
endif ()

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

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