vtkCellArrayIterator.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkCellArrayIterator_h
#define vtkCellArrayIterator_h
 
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkObject.h"
 
#include "vtkCellArray.h"    // Needed for inline methods
#include "vtkIdList.h"       // Needed for inline methods
#include "vtkSmartPointer.h" // For vtkSmartPointer
 
#include <cassert>     // for assert
#include <type_traits> // for std::enable_if
 
VTK_ABI_NAMESPACE_BEGIN
class VTKCOMMONDATAMODEL_EXPORT vtkCellArrayIterator : public vtkObject
{
public:
 
  vtkTypeMacro(vtkCellArrayIterator, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
  static vtkCellArrayIterator* New();
 
  vtkCellArray* GetCellArray() { return this->CellArray; }
 
  void GoToCell(vtkIdType cellId)
  {
    this->CurrentCellId = cellId;
    this->NumberOfCells = this->CellArray->GetNumberOfCells();
    assert(cellId <= this->NumberOfCells);
  }
 
 
  void GetCellAtId(vtkIdType cellId, vtkIdType& numCellPts, vtkIdType const*& cellPts)
  {
    this->GoToCell(cellId);
    this->GetCurrentCell(numCellPts, cellPts);
  }
  void GetCellAtId(vtkIdType cellId, vtkIdList* cellIds)
  {
    this->GoToCell(cellId);
    this->GetCurrentCell(cellIds);
  }
  vtkIdList* GetCellAtId(vtkIdType cellId)
  {
    this->GoToCell(cellId);
    return this->GetCurrentCell();
  }
 
  void GoToFirstCell()
  {
    this->CurrentCellId = 0;
    this->NumberOfCells = this->CellArray->GetNumberOfCells();
  }
 
  void GoToNextCell() { ++this->CurrentCellId; }
 
  bool IsDoneWithTraversal() { return this->CurrentCellId >= this->NumberOfCells; }
 
  vtkIdType GetCurrentCellId() const { return this->CurrentCellId; }
 
 
  void GetCurrentCell(vtkIdType& cellSize, vtkIdType const*& cellPoints)
  {
    assert(this->CurrentCellId < this->NumberOfCells);
    // Either refer to vtkCellArray storage buffer, or copy into local buffer
    if (this->CellArray->IsStorageShareable())
    {
      this->CellArray->GetCellAtId(this->CurrentCellId, cellSize, cellPoints);
    }
    else // or copy into local iterator buffer.
    {
      this->CellArray->GetCellAtId(this->CurrentCellId, this->TempCell);
      cellSize = this->TempCell->GetNumberOfIds();
      cellPoints = this->TempCell->GetPointer(0);
    }
  }
  void GetCurrentCell(vtkIdList* ids)
  {
    assert(this->CurrentCellId < this->NumberOfCells);
    this->CellArray->GetCellAtId(this->CurrentCellId, ids);
  }
  vtkIdList* GetCurrentCell()
  {
    assert(this->CurrentCellId < this->NumberOfCells);
    this->CellArray->GetCellAtId(this->CurrentCellId, this->TempCell);
    return this->TempCell;
  }
 
  void ReplaceCurrentCell(vtkIdList* list)
  {
    assert(this->CurrentCellId < this->NumberOfCells);
    this->CellArray->ReplaceCellAtId(this->CurrentCellId, list);
  }
 
  void ReplaceCurrentCell(vtkIdType npts, const vtkIdType* pts)
  {
    assert(this->CurrentCellId < this->NumberOfCells);
    this->CellArray->ReplaceCellAtId(this->CurrentCellId, npts, pts);
  }
 
  void ReverseCurrentCell()
  {
    assert(this->CurrentCellId < this->NumberOfCells);
    this->CellArray->ReverseCellAtId(this->CurrentCellId);
  }
 
  friend class vtkCellArray;
 
protected:
  vtkCellArrayIterator() = default;
  ~vtkCellArrayIterator() override = default;
 
  vtkSetMacro(CellArray, vtkCellArray*);
 
  vtkSmartPointer<vtkCellArray> CellArray;
  vtkNew<vtkIdList> TempCell;
  vtkIdType CurrentCellId;
  vtkIdType NumberOfCells;
 
private:
  vtkCellArrayIterator(const vtkCellArrayIterator&) = delete;
  void operator=(const vtkCellArrayIterator&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif // vtkCellArrayIterator_h