vtkTreeLevelsFilter.cxx

/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkTreeLevelsFilter.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/

#include "vtkTreeLevelsFilter.h"

#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkMath.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkIntArray.h"
#include "vtkDataArray.h"

#include "vtkTree.h"
#include "vtkGraph.h"

vtkStandardNewMacro(vtkTreeLevelsFilter);

vtkTreeLevelsFilter::vtkTreeLevelsFilter() = default;

int vtkTreeLevelsFilter::RequestData(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  // Storing the inputTree and outputTree handles
  vtkTree *inputTree = vtkTree::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkTree *outputTree = vtkTree::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));

  // Copy the input to the output.
  outputTree->ShallowCopy(inputTree);

  // Add the 1-tuple array that will store the level from
  // the root down (root = 0, and +1 for each level down)
  vtkIntArray *levelArray = vtkIntArray::New();
  levelArray->SetName("level");
  levelArray->SetNumberOfComponents(1);
  levelArray->SetNumberOfTuples(outputTree->GetNumberOfVertices());
  vtkDataSetAttributes *data = outputTree->GetVertexData();
  data->AddArray(levelArray);

  // Add the 1-tuple array that will marks each
  // leaf with a '1' and everything else with a '0'
  vtkIntArray *leafArray = vtkIntArray::New();
  leafArray->SetName("leaf");
  leafArray->SetNumberOfComponents(1);
  leafArray->SetNumberOfTuples(outputTree->GetNumberOfVertices());
  data->AddArray(leafArray);

  for (vtkIdType i = 0; i < outputTree->GetNumberOfVertices(); i++)
  {
    levelArray->SetValue(i, outputTree->GetLevel(i));
    leafArray->SetValue(i, outputTree->IsLeaf(i));
  }

  // Set levels as the active point scalar
  data->SetActiveScalars("level");

  // Clean up
  levelArray->Delete();
  leafArray->Delete();

  return 1;
}

void vtkTreeLevelsFilter::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);
}