VTK/Examples/Cxx/Graphs/EdgeWeights

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VTK Examples Baseline Graphs TestWeights.png

EdgeWeights.cxx

#include <vtkSmartPointer.h>
#include <vtkDataSetAttributes.h>
#include <vtkDoubleArray.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkCircularLayoutStrategy.h>
#include <vtkDoubleArray.h>
#include <vtkGraphLayoutView.h>
#include <vtkIntArray.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkRenderWindowInteractor.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkMutableUndirectedGraph> g = 
    vtkSmartPointer<vtkMutableUndirectedGraph>::New();
 
  // Create 3 vertices
  vtkIdType v1 = g->AddVertex();
  vtkIdType v2 = g->AddVertex();
  vtkIdType v3 = g->AddVertex();
 
  // Create a fully connected graph
  g->AddEdge(v1, v2);
  g->AddEdge(v2, v3);
  g->AddEdge(v1, v3);
 
  // Create the edge weight array
  vtkSmartPointer<vtkDoubleArray> weights = 
    vtkSmartPointer<vtkDoubleArray>::New();
  weights->SetNumberOfComponents(1);
  weights->SetName("Weights");
 
  // Set the edge weights
  weights->InsertNextValue(1.0);
  weights->InsertNextValue(1.0);
  weights->InsertNextValue(2.0);
 
  // Add the edge weight array to the graph
  g->GetEdgeData()->AddArray(weights);
 
  std::cout << "Number of Weights: "
            << vtkDoubleArray::SafeDownCast(
              g->GetEdgeData()->GetArray("Weights"))->GetNumberOfTuples()
            << std::endl;
 
  for(vtkIdType i = 0; i < weights->GetNumberOfTuples(); i++)
    {
    double w = weights->GetValue(i);
    std::cout << "Weight " << i << " : " << w << std::endl;
    }
 
  vtkSmartPointer<vtkGraphLayoutView> graphLayoutView = 
    vtkSmartPointer<vtkGraphLayoutView>::New();
  graphLayoutView->AddRepresentationFromInput(g);
  graphLayoutView->SetEdgeLabelVisibility(true);
  graphLayoutView->SetEdgeLabelArrayName("Weights");
  graphLayoutView->ResetCamera();
  graphLayoutView->Render();
  graphLayoutView->GetInteractor()->Start();
 
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(EdgeWeights)

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

add_executable(EdgeWeights MACOSX_BUNDLE EdgeWeights.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(EdgeWeights ${VTK_LIBRARIES})
else()
  target_link_libraries(EdgeWeights vtkHybrid vtkWidgets)
endif()

Download and Build EdgeWeights

Click here to download EdgeWeights. and its CMakeLists.txt file.

Once the tarball EdgeWeights.tar has been downloaded and extracted,

cd EdgeWeights/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:

./EdgeWeights

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.