ScaleVertices

VTKExamples/Cxx/Graphs/ScaleVertices

Description

Scale the vertices based on a data array.

Other Languages

See (Python)

Question

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Code

ScaleVertices.cxx

#include <vtkSmartPointer.h>
#include <vtkRenderedGraphRepresentation.h>
#include <vtkFloatArray.h>
#include <vtkMutableUndirectedGraph.h>
#include <vtkGraphWriter.h>
#include <vtkGraphLayoutView.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkDataSetAttributes.h>
#include <vtkGraphToGlyphs.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkMutableUndirectedGraph> g =
    vtkSmartPointer<vtkMutableUndirectedGraph>::New();

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

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

  vtkSmartPointer<vtkFloatArray> scales =
    vtkSmartPointer<vtkFloatArray>::New();
  scales->SetNumberOfComponents(1);
  scales->SetName("Scales");
  scales->InsertNextValue(1.0);
  scales->InsertNextValue(4.0);

  g->GetVertexData()->AddArray(scales);

  vtkSmartPointer<vtkGraphLayoutView> layoutView =
    vtkSmartPointer<vtkGraphLayoutView>::New();
  layoutView->AddRepresentationFromInput(g);
  layoutView->ScaledGlyphsOn();
  layoutView->SetScalingArrayName("Scales");
  dynamic_cast<vtkRenderedGraphRepresentation*>(layoutView->GetRepresentation())
            ->SetGlyphType(vtkGraphToGlyphs::CIRCLE);
  layoutView->ResetCamera();
  layoutView->Render();
  layoutView->GetInteractor()->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ScaleVertices)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkIOLegacy
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  vtkViewsInfovis QUIET)
if (NOT VTK_FOUND)
  message("Skipping ScaleVertices: ${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(ScaleVertices MACOSX_BUNDLE ScaleVertices.cxx )
  target_link_libraries(ScaleVertices PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ScaleVertices MACOSX_BUNDLE ScaleVertices.cxx )
  target_link_libraries(ScaleVertices PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ScaleVertices
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ScaleVertices

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

cd ScaleVertices/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:

./ScaleVertices

WINDOWS USERS

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