vtkUnstructuredGridCellIterator.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkUnstructuredGridCellIterator.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 vtkUnstructuredGridCellIterator_h
#define vtkUnstructuredGridCellIterator_h
 
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkCellIterator.h"
#include "vtkSmartPointer.h" // For vtkSmartPointer
 
class vtkCellArray;
class vtkUnsignedCharArray;
class vtkUnstructuredGrid;
class vtkPoints;
 
class VTKCOMMONDATAMODEL_EXPORT vtkUnstructuredGridCellIterator :
    public vtkCellIterator
{
public:
  static vtkUnstructuredGridCellIterator *New();
  vtkTypeMacro(vtkUnstructuredGridCellIterator, vtkCellIterator)
  virtual void PrintSelf(ostream &os, vtkIndent indent);
 
  bool IsDoneWithTraversal();
  vtkIdType GetCellId();
 
protected:
  vtkUnstructuredGridCellIterator();
  ~vtkUnstructuredGridCellIterator();
 
  void ResetToFirstCell();
  void IncrementToNextCell();
  void FetchCellType();
  void FetchPointIds();
  void FetchPoints();
  void FetchFaces();
 
  friend class vtkUnstructuredGrid;
  void SetUnstructuredGrid(vtkUnstructuredGrid *ug);
 
  unsigned char *CellTypeBegin;
  unsigned char *CellTypePtr;
  unsigned char *CellTypeEnd;
 
  vtkIdType *ConnectivityBegin;
  vtkIdType *ConnectivityPtr;
  vtkIdType *FacesBegin;
  vtkIdType *FacesLocsBegin;
  vtkIdType *FacesLocsPtr;
 
  // Cache misses make updating ConnectivityPtr in IncrementToNextCell too
  // expensive, so we wait to walk through the array until the point ids are
  // needed. This variable keeps track of how far we need to increment.
  vtkIdType SkippedCells;
  void CatchUpSkippedCells();
 
  vtkSmartPointer<vtkPoints> UnstructuredGridPoints;
 
private:
  vtkUnstructuredGridCellIterator(const vtkUnstructuredGridCellIterator &); // Not implemented.
  void operator=(const vtkUnstructuredGridCellIterator &);   // Not implemented.
};
 
#endif //vtkUnstructuredGridCellIterator_h