vtkCellLinks.h

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

  Program:   Visualization Toolkit
  Module:    vtkCellLinks.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 vtkCellLinks_h
#define vtkCellLinks_h

#include "vtkAbstractCellLinks.h"
#include "vtkCommonDataModelModule.h" // For export macro

class vtkDataSet;
class vtkCellArray;

class VTKCOMMONDATAMODEL_EXPORT vtkCellLinks : public vtkAbstractCellLinks
{
public:
  class Link
  {
  public:
    vtkIdType ncells;
    vtkIdType* cells;
  };


  static vtkCellLinks* New();
  vtkTypeMacro(vtkCellLinks, vtkAbstractCellLinks);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  void BuildLinks(vtkDataSet* data) override;

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

  void Initialize() override;

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

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

  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() override;

  void Reset() override;

  unsigned long GetActualMemorySize() override;

  void DeepCopy(vtkAbstractCellLinks* src) override;

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

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

  void AllocateLinks(vtkIdType n);

  void InsertCellReference(vtkIdType ptId, vtkIdType 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&) = delete;
  void operator=(const vtkCellLinks&) = delete;
};

//----------------------------------------------------------------------------
inline void vtkCellLinks::InsertCellReference(vtkIdType ptId, vtkIdType 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 = nullptr;
}

//----------------------------------------------------------------------------
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;
  vtkIdType ncells = this->Array[ptId].ncells;

  for (vtkIdType i = 0; i < ncells; i++)
  {
    if (cells[i] == cellId)
    {
      for (vtkIdType 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)
{
  vtkIdType newSize = this->Array[ptId].ncells + size;
  vtkIdType* cells = new vtkIdType[newSize];
  memcpy(cells, this->Array[ptId].cells,
    static_cast<size_t>(this->Array[ptId].ncells) * sizeof(vtkIdType));
  delete[] this->Array[ptId].cells;
  this->Array[ptId].cells = cells;
}

#endif