vtkSimpleScalarTree.h

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

  Program:   Visualization Toolkit
  Module:    vtkSimpleScalarTree.h

  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.

=========================================================================*/
#ifndef vtkSimpleScalarTree_h
#define vtkSimpleScalarTree_h

#include "vtkCommonExecutionModelModule.h" // For export macro
#include "vtkScalarTree.h"

class vtkScalarNode;

class VTKCOMMONEXECUTIONMODEL_EXPORT vtkSimpleScalarTree : public vtkScalarTree
{
public:
  static vtkSimpleScalarTree *New();


  vtkTypeMacro(vtkSimpleScalarTree,vtkScalarTree);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  vtkSetClampMacro(BranchingFactor,int,2,VTK_INT_MAX);
  vtkGetMacro(BranchingFactor,int);


  vtkGetMacro(Level,int);


  vtkSetClampMacro(MaxLevel,int,1,VTK_INT_MAX);
  vtkGetMacro(MaxLevel,int);

  void BuildTree() override;

  void Initialize() override;

  void InitTraversal(double scalarValue) override;

  vtkCell *GetNextCell(vtkIdType &cellId, vtkIdList* &ptIds,
                               vtkDataArray *cellScalars) override;

  // The following methods supports parallel (threaded)
  // applications. Basically batches of cells (which represent a
  // portion of the whole dataset) are available for processing in a
  // parallel For() operation.

  vtkIdType GetNumberOfCellBatches() override;

  const vtkIdType* GetCellBatch(vtkIdType batchNum,
                                        vtkIdType& numCells) override;

protected:
  vtkSimpleScalarTree();
  ~vtkSimpleScalarTree() override;

  int MaxLevel;
  int Level;
  int BranchingFactor; //number of children per node
  vtkScalarNode *Tree; //pointerless scalar range tree
  int TreeSize; //allocated size of tree
  vtkIdType LeafOffset; //offset to leaf nodes of tree

private:
  vtkIdType NumCells; //the number of cells in this dataset
  vtkIdType TreeIndex; //traversal location within tree
  int       ChildNumber; //current child in traversal
  vtkIdType CellId; //current cell id being examined
  int       FindStartLeaf(vtkIdType index, int level);
  int       FindNextLeaf(vtkIdType index,int level);

  vtkIdType *CandidateCells; //to support parallel computing
  vtkIdType  NumCandidates;

private:
  vtkSimpleScalarTree(const vtkSimpleScalarTree&) = delete;
  void operator=(const vtkSimpleScalarTree&) = delete;
};

#endif