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SelectedVerticesAndEdges

Repository source: SelectedVerticesAndEdges

Description

  • Thanks to Eric Monson

Other languages

See (Python), (PythonicAPI)

Question

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

Code

SelectedVerticesAndEdges.cxx

#include <vtkAnnotationLink.h>
#include <vtkGraphLayoutView.h>
#include <vtkIdTypeArray.h>
#include <vtkInteractorStyleRubberBand2D.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkRandomGraphSource.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderedGraphRepresentation.h>
#include <vtkRenderer.h>
#include <vtkSelection.h>
#include <vtkSelectionNode.h>

namespace {
class RubberBandStyle : public vtkInteractorStyleRubberBand2D
{
public:
  static RubberBandStyle* New();
  vtkTypeMacro(RubberBandStyle, vtkInteractorStyleRubberBand2D);

  virtual void OnLeftButtonUp() override
  {
    // Forward events
    vtkInteractorStyleRubberBand2D::OnLeftButtonUp();

    vtkSelection* selection = this->View->GetRepresentation()
                                  ->GetAnnotationLink()
                                  ->GetCurrentSelection();
    vtkSelectionNode* vertices = nullptr;
    vtkSelectionNode* edges = nullptr;
    if (selection->GetNode(0)->GetFieldType() == vtkSelectionNode::VERTEX)
    {
      vertices = selection->GetNode(0);
    }
    else if (selection->GetNode(0)->GetFieldType() == vtkSelectionNode::EDGE)
    {
      edges = selection->GetNode(0);
    }

    if (selection->GetNode(1)->GetFieldType() == vtkSelectionNode::VERTEX)
    {
      vertices = selection->GetNode(1);
    }
    else if (selection->GetNode(1)->GetFieldType() == vtkSelectionNode::EDGE)
    {
      edges = selection->GetNode(1);
    }

    vtkIdTypeArray* vertexList =
        dynamic_cast<vtkIdTypeArray*>(vertices->GetSelectionList());
    std::cout << "There are " << vertexList->GetNumberOfTuples()
              << " vertices selected." << std::endl;
    auto hasVertices = vertexList->GetNumberOfTuples() > 0;
    if (hasVertices)
    {
      std::cout << "Vertex Ids: ";
      for (vtkIdType i = 0; i < vertexList->GetNumberOfTuples(); i++)
      {
        if (i < vertexList->GetNumberOfTuples() - 1)
        {
          std::cout << vertexList->GetValue(i) << ", ";
        }
        else
        {
          std::cout << vertexList->GetValue(i) << std::endl;
        }
      }
    }

    vtkIdTypeArray* edgeList =
        dynamic_cast<vtkIdTypeArray*>(edges->GetSelectionList());
    std::cout << "There are " << edgeList->GetNumberOfTuples()
              << " edges selected." << std::endl;
    auto hasEdges = edgeList->GetNumberOfTuples() > 0;
    if (hasEdges)
    {
      std::cout << "Edge Ids: ";

      for (vtkIdType i = 0; i < edgeList->GetNumberOfTuples(); i++)
      {
        if (i < edgeList->GetNumberOfTuples() - 1)
        {
          std::cout << edgeList->GetValue(i) << ", ";
        }
        else
        {
          std::cout << edgeList->GetValue(i) << std::endl;
        }
      }
    }

    if (hasVertices || hasEdges)
    {
      std::cout << "- - -" << std::endl;
    }
    else
    {
      std::cout << std::endl;
    }
  }

  vtkGraphLayoutView* View;
};
vtkStandardNewMacro(RubberBandStyle);
} // namespace

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

  vtkNew<vtkRandomGraphSource> source;

  vtkNew<vtkGraphLayoutView> view;
  view->AddRepresentationFromInputConnection(source->GetOutputPort());

  view->GetRenderWindow()->SetSize(600, 600);
  view->GetRenderWindow()->SetWindowName("SelectedVerticesAndEdges");
  view->GetRenderer()->SetBackground(
      colors->GetColor3d("MidnightBlue").GetData());
  view->GetRenderer()->SetBackground2(
      colors->GetColor3d("RoyalBlue").GetData());

  vtkNew<RubberBandStyle> style;
  style->View = view;
  view->SetInteractorStyle(style);

  view->ResetCamera();
  view->Render();

  view->GetInteractor()->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(SelectedVerticesAndEdges)

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

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

Download and Build SelectedVerticesAndEdges

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

cd SelectedVerticesAndEdges/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:

./SelectedVerticesAndEdges

WINDOWS USERS

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