dox/Filtering/vtkCellArray.h

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

  Program:   Visualization Toolkit
  Module:    vtkCellArray.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 __vtkCellArray_h
#define __vtkCellArray_h

#include "vtkObject.h"

#include "vtkIdTypeArray.h" // Needed for inline methods
#include "vtkCell.h" // Needed for inline methods

class VTK_FILTERING_EXPORT vtkCellArray : public vtkObject
{
public:
  vtkTypeMacro(vtkCellArray,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkCellArray *New();


  int Allocate(const vtkIdType sz, const int ext=1000)
    {return this->Ia->Allocate(sz,ext);}

  void Initialize();


  vtkGetMacro(NumberOfCells, vtkIdType);


  vtkSetMacro(NumberOfCells, vtkIdType);


  vtkIdType EstimateSize(vtkIdType numCells, int maxPtsPerCell)
    {return numCells*(1+maxPtsPerCell);}

  void InitTraversal() {this->TraversalLocation=0;};

  int GetNextCell(vtkIdType& npts, vtkIdType* &pts);

  int GetNextCell(vtkIdList *pts);


  vtkIdType GetSize()
    {return this->Ia->GetSize();}


  vtkIdType GetNumberOfConnectivityEntries()
    {return this->Ia->GetMaxId()+1;}

  void GetCell(vtkIdType loc, vtkIdType &npts, vtkIdType* &pts);

  void GetCell(vtkIdType loc, vtkIdList* pts);

  vtkIdType InsertNextCell(vtkCell *cell);

  vtkIdType InsertNextCell(vtkIdType npts, const vtkIdType* pts);

  vtkIdType InsertNextCell(vtkIdList *pts);

  vtkIdType InsertNextCell(int npts);

  void InsertCellPoint(vtkIdType id);

  void UpdateCellCount(int npts);


  vtkIdType GetInsertLocation(int npts)
    {return (this->InsertLocation - npts - 1);};


  vtkIdType GetTraversalLocation()
    {return this->TraversalLocation;}
  void SetTraversalLocation(vtkIdType loc)
    {this->TraversalLocation = loc;}


  vtkIdType GetTraversalLocation(vtkIdType npts)
    {return(this->TraversalLocation-npts-1);}

  void ReverseCell(vtkIdType loc);

  void ReplaceCell(vtkIdType loc, int npts, const vtkIdType *pts);

  int GetMaxCellSize();


  vtkIdType *GetPointer()
    {return this->Ia->GetPointer(0);}

  vtkIdType *WritePointer(const vtkIdType ncells, const vtkIdType size);

  void SetCells(vtkIdType ncells, vtkIdTypeArray *cells);

  void DeepCopy(vtkCellArray *ca);


  vtkIdTypeArray* GetData()
    {return this->Ia;}

  void Reset();


  void Squeeze()
    {this->Ia->Squeeze();}

  unsigned long GetActualMemorySize();

protected:
  vtkCellArray();
  ~vtkCellArray();

  vtkIdType NumberOfCells;
  vtkIdType InsertLocation;     //keep track of current insertion point
  vtkIdType TraversalLocation;   //keep track of traversal position
  vtkIdTypeArray *Ia;

private:
  vtkCellArray(const vtkCellArray&);  // Not implemented.
  void operator=(const vtkCellArray&);  // Not implemented.
};


//----------------------------------------------------------------------------
inline vtkIdType vtkCellArray::InsertNextCell(vtkIdType npts,
                                              const vtkIdType* pts)
{
  vtkIdType i = this->Ia->GetMaxId() + 1;
  vtkIdType *ptr = this->Ia->WritePointer(i, npts+1);

  for ( *ptr++ = npts, i = 0; i < npts; i++)
    {
    *ptr++ = *pts++;
    }

  this->NumberOfCells++;
  this->InsertLocation += npts + 1;

  return this->NumberOfCells - 1;
}

//----------------------------------------------------------------------------
inline vtkIdType vtkCellArray::InsertNextCell(int npts)
{
  this->InsertLocation = this->Ia->InsertNextValue(npts) + 1;
  this->NumberOfCells++;

  return this->NumberOfCells - 1;
}

//----------------------------------------------------------------------------
inline void vtkCellArray::InsertCellPoint(vtkIdType id)
{
  this->Ia->InsertValue(this->InsertLocation++, id);
}

//----------------------------------------------------------------------------
inline void vtkCellArray::UpdateCellCount(int npts)
{
  this->Ia->SetValue(this->InsertLocation-npts-1, npts);
}

//----------------------------------------------------------------------------
inline vtkIdType vtkCellArray::InsertNextCell(vtkIdList *pts)
{
  return this->InsertNextCell(pts->GetNumberOfIds(), pts->GetPointer(0));
}

//----------------------------------------------------------------------------
inline vtkIdType vtkCellArray::InsertNextCell(vtkCell *cell)
{
  return this->InsertNextCell(cell->GetNumberOfPoints(),
                              cell->PointIds->GetPointer(0));
}

//----------------------------------------------------------------------------
inline void vtkCellArray::Reset()
{
  this->NumberOfCells = 0;
  this->InsertLocation = 0;
  this->TraversalLocation = 0;
  this->Ia->Reset();
}

//----------------------------------------------------------------------------
inline int vtkCellArray::GetNextCell(vtkIdType& npts, vtkIdType* &pts)
{
  if ( this->Ia->GetMaxId() >= 0 &&
       this->TraversalLocation <= this->Ia->GetMaxId() )
    {
    npts = this->Ia->GetValue(this->TraversalLocation++);
    pts = this->Ia->GetPointer(this->TraversalLocation);
    this->TraversalLocation += npts;
    return 1;
    }
  npts=0;
  pts=0;
  return 0;
}

//----------------------------------------------------------------------------
inline void vtkCellArray::GetCell(vtkIdType loc, vtkIdType &npts,
                                  vtkIdType* &pts)
{
  npts = this->Ia->GetValue(loc++);
  pts  = this->Ia->GetPointer(loc);
}

//----------------------------------------------------------------------------
inline void vtkCellArray::ReverseCell(vtkIdType loc)
{
  int i;
  vtkIdType tmp;
  vtkIdType npts=this->Ia->GetValue(loc);
  vtkIdType *pts=this->Ia->GetPointer(loc+1);
  for (i=0; i < (npts/2); i++)
    {
    tmp = pts[i];
    pts[i] = pts[npts-i-1];
    pts[npts-i-1] = tmp;
    }
}

//----------------------------------------------------------------------------
inline void vtkCellArray::ReplaceCell(vtkIdType loc, int npts,
                                      const vtkIdType *pts)
{
  vtkIdType *oldPts=this->Ia->GetPointer(loc+1);
  for (int i=0; i < npts; i++)
    {
    oldPts[i] = pts[i];
    }
}

//----------------------------------------------------------------------------
inline vtkIdType *vtkCellArray::WritePointer(const vtkIdType ncells,
                                             const vtkIdType size)
{
  this->NumberOfCells = ncells;
  this->InsertLocation = 0;
  this->TraversalLocation = 0;
  return this->Ia->WritePointer(0,size);
}

#endif

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