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ConstructGraph

Repository source: ConstructGraph

Description

This example shows how to construct a simple graph.

Other languages

See (Python)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

ConstructGraph.cxx

#include <vtkForceDirectedLayoutStrategy.h>
#include <vtkGraphLayoutView.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkMutableUndirectedGraph> g;

  vtkIdType v1 = g->AddVertex();
  vtkIdType v2 = g->AddVertex();

  g->AddEdge(v1, v2);

  std::cout << "Number of vertices: " << g->GetNumberOfVertices() << std::endl;
  std::cout << "Number of edges: " << g->GetNumberOfEdges() << std::endl;

  g->AddEdge(v1, v2);

  std::cout << "Number of vertices: " << g->GetNumberOfVertices() << std::endl;
  std::cout << "Number of edges: " << g->GetNumberOfEdges() << std::endl;

  vtkNew<vtkForceDirectedLayoutStrategy> forceDirected;

  vtkNew<vtkGraphLayoutView> graphLayoutView;
  graphLayoutView->AddRepresentationFromInput(g);
  // If we create a layout object directly, just set the pointer through this
  // method.
  // graphLayoutView->SetLayoutStrategy(forceDirected);
  graphLayoutView->SetLayoutStrategyToForceDirected();
  graphLayoutView->ResetCamera();
  graphLayoutView->GetRenderer()->SetBackground(
      colors->GetColor3d("Navy").GetData());
  graphLayoutView->GetRenderer()->SetBackground2(
      colors->GetColor3d("MidnightBlue").GetData());
  graphLayoutView->GetRenderWindow()->SetWindowName("ConstructGraph");
  graphLayoutView->Render();
  graphLayoutView->GetInteractor()->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(ConstructGraph)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  InfovisLayout
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
  ViewsInfovis
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "ConstructGraph: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(ConstructGraph MACOSX_BUNDLE ConstructGraph.cxx )
  target_link_libraries(ConstructGraph PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS ConstructGraph
  MODULES ${VTK_LIBRARIES}
)

Download and Build ConstructGraph

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

cd ConstructGraph/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:

./ConstructGraph

WINDOWS USERS

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