ColorVertexLabels

VTKExamples/Cxx/Graphs/ColorVertexLabels


Code

ColorVertexLabels.cxx

#include <vtkSmartPointer.h>
#include <vtkIntArray.h>
#include <vtkDataSetAttributes.h>
#include <vtkGraphLayoutView.h>
#include <vtkMutableDirectedGraph.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderedGraphRepresentation.h>
#include <vtkTextProperty.h>

int main(int, char *[])
{
  // Create a graph
  vtkSmartPointer<vtkMutableDirectedGraph> graph =
    vtkSmartPointer<vtkMutableDirectedGraph>::New();

  vtkIdType v1 = graph->AddVertex();
  vtkIdType v2 = graph->AddVertex();
  graph->AddEdge(v1,v2);

  // Create an array for the vertex labels
  vtkSmartPointer<vtkIntArray> vertexIDs =
    vtkSmartPointer<vtkIntArray>::New();
  vertexIDs->SetNumberOfComponents(1);
  vertexIDs->SetName("VertexIDs");

  // Set the vertex labels
  vertexIDs->InsertNextValue(0);
  vertexIDs->InsertNextValue(1);

  // Add the array to the graph
  graph->GetVertexData()->AddArray(vertexIDs);

  vtkSmartPointer<vtkGraphLayoutView> graphLayoutView =
    vtkSmartPointer<vtkGraphLayoutView>::New();
  graphLayoutView->AddRepresentationFromInput(graph);
  graphLayoutView->SetVertexLabelVisibility(true);
  vtkRenderedGraphRepresentation::SafeDownCast(graphLayoutView->GetRepresentation())
            ->GetVertexLabelTextProperty()->SetColor(1,0,0);
  graphLayoutView->SetLayoutStrategyToSimple2D();
  graphLayoutView->SetVertexLabelArrayName("VertexIDs");
  graphLayoutView->ResetCamera();
  graphLayoutView->Render();
  graphLayoutView->GetInteractor()->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ColorVertexLabels)

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

Download and Build ColorVertexLabels

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

cd ColorVertexLabels/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:

./ColorVertexLabels

WINDOWS USERS

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