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common/vtkCellLinks.h

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

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


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#ifndef __vtkCellLinks_h
#define __vtkCellLinks_h

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

struct _vtkLink_s {
    unsigned short ncells;
    int *cells;
};

class VTK_EXPORT vtkCellLinks : public vtkObject 
{
public:
  static vtkCellLinks *New();
  vtkTypeMacro(vtkCellLinks,vtkObject);

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

  _vtkLink_s &GetLink(int ptId) {return this->Array[ptId];};

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

  void BuildLinks(vtkDataSet *data);

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

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

  int InsertNextPoint(int numLinks);

  void InsertNextCellReference(int ptId, int cellId);

  void DeletePoint(int ptId);

  void RemoveCellReference(int cellId, int ptId);

  void AddCellReference(int cellId, int ptId);

  void ResizeCellList(int 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();
  vtkCellLinks(const vtkCellLinks&) {};
  void operator=(const vtkCellLinks&) {};

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

  void AllocateLinks(int n);

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

  _vtkLink_s *Array;   // pointer to data
  int Size;       // allocated size of data
  int MaxId;     // maximum index inserted thus far
  int Extend;     // grow array by this point
  _vtkLink_s *Resize(int sz);  // function to resize data
};


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

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

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

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

inline void vtkCellLinks::ResizeCellList(int ptId, int size)
{
  int *cells, newSize;

  newSize = this->Array[ptId].ncells + size;
  cells = new int[newSize];
  memcpy(cells, this->Array[ptId].cells, this->Array[ptId].ncells*sizeof(int));
  delete [] this->Array[ptId].cells;
  this->Array[ptId].cells = cells;
}

#endif

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