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VisualizeGraph

vtk-examples/Cxx/Graphs/VisualizeGraph


Description

This example shows how to construct a graph and visualize it. You can select edges and vertices with the mouse.

Other languages

See (Python), (Java)

Question

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

Code

VisualizeGraph.cxx

#include <vtkSmartPointer.h>
#include <vtkGraphLayoutStrategy.h>
#include <vtkGraphLayoutView.h>
#include <vtkGraphWriter.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSimple2DLayoutStrategy.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkNamedColors.h>

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

  vtkNew<vtkMutableUndirectedGraph> g;

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

  g->AddEdge(v1, v2);
  g->AddEdge(v1, v2);

  vtkNew<vtkGraphLayoutView> graphLayoutView;
  graphLayoutView->AddRepresentationFromInput(g);
  graphLayoutView->SetLayoutStrategy("Simple 2D");
  graphLayoutView->GetRenderer()->SetBackground(
      colors->GetColor3d("SaddleBrown").GetData());
  graphLayoutView->GetRenderer()->SetBackground2(
      colors->GetColor3d("Wheat").GetData());
  graphLayoutView->GetRenderWindow()->SetWindowName("VisualizeGraph");
  graphLayoutView->ResetCamera();
  graphLayoutView->Render();

  dynamic_cast<vtkSimple2DLayoutStrategy*>(graphLayoutView->GetLayoutStrategy())
      ->SetRandomSeed(0);
  graphLayoutView->GetInteractor()->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(VisualizeGraph)

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

if (NOT VTK_FOUND)
  message(FATAL_ERROR "VisualizeGraph: 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(VisualizeGraph MACOSX_BUNDLE VisualizeGraph.cxx )
  target_link_libraries(VisualizeGraph PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS VisualizeGraph
  MODULES ${VTK_LIBRARIES}
)

Download and Build VisualizeGraph

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

cd VisualizeGraph/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:

./VisualizeGraph

WINDOWS USERS

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