VTK/Examples/Cxx/PolyData/ExtractSelectionOriginalId

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkPointData.h>
#include <vtkIdTypeArray.h>
#include <vtkInformation.h>
#include <vtkPointSource.h>
#include <vtkExtractSelection.h>
#include <vtkSelection.h>
#include <vtkSelectionNode.h>
#include <vtkPolyData.h>
#include <vtkUnstructuredGrid.h>
#include <vtkIdTypeArray.h>
#include <vtkDataSetMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
#include <vtkVertexGlyphFilter.h>
 
int main(int, char *[])
{
  vtkSmartPointer<vtkPointSource> pointSource =
    vtkSmartPointer<vtkPointSource>::New();
  pointSource->SetNumberOfPoints(50);
  pointSource->Update();
 
  std::cout << "There are " << pointSource->GetOutput()->GetNumberOfPoints()
            << " input points." << std::endl;
 
  vtkSmartPointer<vtkIdTypeArray> ids =
    vtkSmartPointer<vtkIdTypeArray>::New();
  ids->SetNumberOfComponents(1);
 
  //set values
  for(unsigned int i = 10; i < 20; i++)
    {
    ids->InsertNextValue(i);
    }
 
  vtkSmartPointer<vtkSelectionNode> selectionNode =
      vtkSmartPointer<vtkSelectionNode>::New();
  selectionNode->SetFieldType(vtkSelectionNode::POINT);
  selectionNode->SetContentType(vtkSelectionNode::INDICES);
  selectionNode->SetSelectionList(ids);
 
  vtkSmartPointer<vtkSelection> selection =
      vtkSmartPointer<vtkSelection>::New();
  selection->AddNode(selectionNode);
 
  vtkSmartPointer<vtkExtractSelection> extractSelection =
      vtkSmartPointer<vtkExtractSelection>::New();
 
  extractSelection->SetInputConnection(0, pointSource->GetOutputPort());
#if VTK_MAJOR_VERSION <= 5
  extractSelection->SetInput(1, selection);
#else
  extractSelection->SetInputData(1, selection);
#endif
  extractSelection->Update();
 
  //in selection
  vtkSmartPointer<vtkUnstructuredGrid> selected =
    vtkSmartPointer<vtkUnstructuredGrid>::New();
  selected->ShallowCopy(extractSelection->GetOutput());
 
  std::cout << "There are " << selected->GetNumberOfPoints()
            << " points in the selection." << std::endl;
 
  selected->Print(std::cout);
 
  vtkIdTypeArray* originalIds = vtkIdTypeArray::SafeDownCast(selected->GetPointData()->GetArray("vtkOriginalPointIds"));
 
  for(vtkIdType i = 0; i < originalIds->GetNumberOfTuples(); i++)
    {
    std::cout << "Point " << i << " was originally point " << originalIds->GetValue(i) << std::endl;
    }
 
  for(vtkIdType i = 0; i < originalIds->GetNumberOfTuples(); i++)
    {
    vtkIdType query = originalIds->GetValue(i);
    for(vtkIdType j = 0; j < originalIds->GetNumberOfTuples(); j++)
      {
      if(originalIds->GetValue(j) == query)
        {
        std::cout << "Original point " << query << " is now " << j << std::endl;
        }
      }
    }
 
  vtkSmartPointer<vtkDataSetMapper> inputMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  inputMapper->SetInputConnection(pointSource->GetOutputPort());
  vtkSmartPointer<vtkActor> inputActor =
    vtkSmartPointer<vtkActor>::New();
  inputActor->SetMapper(inputMapper);
 
  vtkSmartPointer<vtkDataSetMapper> selectedMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  selectedMapper->SetInputConnection(selected->GetProducerPort());
#else
  selectedMapper->SetInputData(selected);
#endif
  vtkSmartPointer<vtkActor> selectedActor =
    vtkSmartPointer<vtkActor>::New();
  selectedActor->SetMapper(selectedMapper);
 
  // There will be one render window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(900, 300);
 
  // And one interactor
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
  double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
 
  // Setup the renderers
  vtkSmartPointer<vtkRenderer> leftRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(leftRenderer);
  leftRenderer->SetViewport(leftViewport);
  leftRenderer->SetBackground(.6, .5, .4);
 
  vtkSmartPointer<vtkRenderer> rightRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(rightRenderer);
  rightRenderer->SetViewport(rightViewport);
  rightRenderer->SetBackground(.4, .5, .6);
 
  leftRenderer->AddActor(inputActor);
  rightRenderer->AddActor(selectedActor);
 
  leftRenderer->ResetCamera();
  rightRenderer->ResetCamera();
 
  renderWindow->Render();
  interactor->Start();
 
  return EXIT_SUCCESS;
}