dox/Filtering/vtkCellLinks.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkCellLinks.h,v $

  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 __vtkCellLinks_h
#define __vtkCellLinks_h

#include "vtkObject.h"
class vtkDataSet;
class vtkCellArray;

class VTK_FILTERING_EXPORT vtkCellLinks : public vtkObject 
{
public:

  //BTX
  class Link {
  public:
    unsigned short ncells;
    vtkIdType *cells;
  };
  //ETX

  static vtkCellLinks *New();
  vtkTypeRevisionMacro(vtkCellLinks,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  void Allocate(vtkIdType numLinks, vtkIdType ext=1000);

  Link &GetLink(vtkIdType ptId) {return this->Array[ptId];};

  unsigned short GetNcells(vtkIdType ptId) { return this->Array[ptId].ncells;};

  void BuildLinks(vtkDataSet *data);

  void BuildLinks(vtkDataSet *data, vtkCellArray *Connectivity);

  vtkIdType *GetCells(vtkIdType ptId) {return this->Array[ptId].cells;};

  vtkIdType InsertNextPoint(int numLinks);

  void InsertNextCellReference(vtkIdType ptId, vtkIdType cellId);

  void DeletePoint(vtkIdType ptId);

  void RemoveCellReference(vtkIdType cellId, vtkIdType ptId);

  void AddCellReference(vtkIdType cellId, vtkIdType ptId);

  void ResizeCellList(vtkIdType ptId, int size);

  void Squeeze();

  void Reset();

  unsigned long GetActualMemorySize();
  
  void DeepCopy(vtkCellLinks *src);

protected:
  vtkCellLinks():Array(NULL),Size(0),MaxId(-1),Extend(1000) {};
  ~vtkCellLinks();

  void IncrementLinkCount(vtkIdType ptId) { this->Array[ptId].ncells++;};

  void AllocateLinks(vtkIdType n);


  void InsertCellReference(vtkIdType ptId, unsigned short pos,
                           vtkIdType cellId);

  Link *Array;   // pointer to data
  vtkIdType Size;       // allocated size of data
  vtkIdType MaxId;     // maximum index inserted thus far
  vtkIdType Extend;     // grow array by this point
  Link *Resize(vtkIdType sz);  // function to resize data
private:
  vtkCellLinks(const vtkCellLinks&);  // Not implemented.
  void operator=(const vtkCellLinks&);  // Not implemented.
};

//----------------------------------------------------------------------------
inline void vtkCellLinks::InsertCellReference(vtkIdType ptId,
                                              unsigned short pos,
                                              vtkIdType cellId) 
{
  this->Array[ptId].cells[pos] = cellId;
}

//----------------------------------------------------------------------------
inline void vtkCellLinks::DeletePoint(vtkIdType ptId)
{
  this->Array[ptId].ncells = 0;
  delete [] this->Array[ptId].cells;
  this->Array[ptId].cells = NULL;
}

//----------------------------------------------------------------------------
inline void vtkCellLinks::InsertNextCellReference(vtkIdType ptId,
                                                  vtkIdType cellId) 
{
  this->Array[ptId].cells[this->Array[ptId].ncells++] = cellId;
}

//----------------------------------------------------------------------------
inline void vtkCellLinks::RemoveCellReference(vtkIdType cellId, vtkIdType ptId)
{
  vtkIdType *cells=this->Array[ptId].cells;
  int ncells=this->Array[ptId].ncells;

  for (int i=0; i < ncells; i++)
    {
    if (cells[i] == cellId)
      {
      for (int j=i; j < (ncells-1); j++)
        {
        cells[j] = cells[j+1];
        }
      this->Array[ptId].ncells--;
      break;
      }
    }
}

//----------------------------------------------------------------------------
inline void vtkCellLinks::AddCellReference(vtkIdType cellId, vtkIdType ptId)
{
  this->Array[ptId].cells[this->Array[ptId].ncells++] = cellId;
}

//----------------------------------------------------------------------------
inline void vtkCellLinks::ResizeCellList(vtkIdType ptId, int size)
{
  int newSize;
  vtkIdType *cells;
  
  newSize = this->Array[ptId].ncells + size;
  cells = new vtkIdType[newSize];
  memcpy(cells, this->Array[ptId].cells,
         this->Array[ptId].ncells*sizeof(vtkIdType));
  delete [] this->Array[ptId].cells;
  this->Array[ptId].cells = cells;
}

#endif

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