VTK
vtkCellIterator.h
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1 /*=========================================================================
2 
3  Program: Visualization Toolkit
4  Module: vtkCellIterator.h
5 
6  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
7  All rights reserved.
8  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
9 
10  This software is distributed WITHOUT ANY WARRANTY; without even
11  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
12  PURPOSE. See the above copyright notice for more information.
13 
14 =========================================================================*/
15 
68 #ifndef vtkCellIterator_h
69 #define vtkCellIterator_h
70 
71 #include "vtkCommonDataModelModule.h" // For export macro
72 #include "vtkCellType.h" // For VTK_EMPTY_CELL
73 #include "vtkObject.h"
74 #include "vtkNew.h" // For vtkNew
75 #include "vtkIdList.h" // For inline methods
76 
77 class vtkGenericCell;
78 class vtkPoints;
79 
80 class VTKCOMMONDATAMODEL_EXPORT vtkCellIterator : public vtkObject
81 {
82 public:
83  void PrintSelf(ostream& os, vtkIndent indent) override;
84  vtkAbstractTypeMacro(vtkCellIterator, vtkObject)
85 
86 
89  void InitTraversal();
90 
94  void GoToNextCell();
95 
99  virtual bool IsDoneWithTraversal() = 0;
100 
105  int GetCellType();
106 
111  int GetCellDimension();
112 
116  virtual vtkIdType GetCellId() = 0;
117 
122  vtkIdList *GetPointIds();
123 
129  vtkPoints *GetPoints();
130 
135  vtkIdList *GetFaces();
136 
142  void GetCell(vtkGenericCell *cell);
143 
148  vtkIdType GetNumberOfPoints();
149 
154  vtkIdType GetNumberOfFaces();
155 
156 protected:
157  vtkCellIterator();
158  ~vtkCellIterator() override;
159 
163  virtual void ResetToFirstCell() = 0;
164 
168  virtual void IncrementToNextCell() = 0;
169 
173  virtual void FetchCellType() = 0;
174 
178  virtual void FetchPointIds() = 0;
179 
183  virtual void FetchPoints() = 0;
184 
191  virtual void FetchFaces() { }
192 
193  int CellType;
197 
198 private:
199  vtkCellIterator(const vtkCellIterator &) = delete;
200  void operator=(const vtkCellIterator &) = delete;
201 
202  enum
203  {
204  UninitializedFlag = 0x0,
205  CellTypeFlag = 0x1,
206  PointIdsFlag = 0x2,
207  PointsFlag = 0x4,
208  FacesFlag = 0x8
209  };
210 
211  void ResetCache()
212  {
213  this->CacheFlags = UninitializedFlag;
214  this->CellType = VTK_EMPTY_CELL;
215  }
216 
217  void SetCache(unsigned char flags)
218  {
219  this->CacheFlags |= flags;
220  }
221 
222  bool CheckCache(unsigned char flags)
223  {
224  return (this->CacheFlags & flags) == flags;
225  }
226 
227  vtkNew<vtkPoints> PointsContainer;
228  vtkNew<vtkIdList> PointIdsContainer;
229  vtkNew<vtkIdList> FacesContainer;
230  unsigned char CacheFlags;
231 };
232 
233 //------------------------------------------------------------------------------
234 inline void vtkCellIterator::InitTraversal()
235 {
236  this->ResetToFirstCell();
237  this->ResetCache();
238 }
239 
240 //------------------------------------------------------------------------------
242 {
243  this->IncrementToNextCell();
244  this->ResetCache();
245 }
246 
247 //------------------------------------------------------------------------------
249 {
250  if (!this->CheckCache(CellTypeFlag))
251  {
252  this->FetchCellType();
253  this->SetCache(CellTypeFlag);
254  }
255  return this->CellType;
256 }
257 
258 //------------------------------------------------------------------------------
260 {
261  if (!this->CheckCache(PointIdsFlag))
262  {
263  this->FetchPointIds();
264  this->SetCache(PointIdsFlag);
265  }
266  return this->PointIds;
267 }
268 
269 //------------------------------------------------------------------------------
271 {
272  if (!this->CheckCache(PointsFlag))
273  {
274  this->FetchPoints();
275  this->SetCache(PointsFlag);
276  }
277  return this->Points;
278 }
279 
280 //------------------------------------------------------------------------------
282 {
283  if (!this->CheckCache(FacesFlag))
284  {
285  this->FetchFaces();
286  this->SetCache(FacesFlag);
287  }
288  return this->Faces;
289 }
290 
291 //------------------------------------------------------------------------------
293 {
294  if (!this->CheckCache(PointIdsFlag))
295  {
296  this->FetchPointIds();
297  this->SetCache(PointIdsFlag);
298  }
299  return this->PointIds->GetNumberOfIds();
300 }
301 
302 //------------------------------------------------------------------------------
304 {
305  switch (this->GetCellType())
306  {
307  case VTK_EMPTY_CELL:
308  case VTK_VERTEX:
309  case VTK_POLY_VERTEX:
310  case VTK_LINE:
311  case VTK_POLY_LINE:
312  case VTK_TRIANGLE:
313  case VTK_TRIANGLE_STRIP:
314  case VTK_POLYGON:
315  case VTK_PIXEL:
316  case VTK_QUAD:
317  case VTK_QUADRATIC_EDGE:
319  case VTK_QUADRATIC_QUAD:
324  case VTK_CUBIC_LINE:
334  return 0;
335 
336  case VTK_TETRA:
337  case VTK_QUADRATIC_TETRA:
340  return 4;
341 
342  case VTK_PYRAMID:
345  case VTK_WEDGE:
346  case VTK_QUADRATIC_WEDGE:
350  return 5;
351 
352  case VTK_VOXEL:
353  case VTK_HEXAHEDRON:
359  return 6;
360 
362  return 7;
363 
364  case VTK_HEXAGONAL_PRISM:
365  return 8;
366 
367  case VTK_POLYHEDRON: // Need to look these up
368  if (!this->CheckCache(FacesFlag))
369  {
370  this->FetchFaces();
371  this->SetCache(FacesFlag);
372  }
373  return this->Faces->GetNumberOfIds() != 0 ? this->Faces->GetId(0) : 0;
374 
375  default:
376  vtkGenericWarningMacro("Unknown cell type: " << this->CellType);
377  break;
378  }
379 
380  return 0;
381 }
382 
383 #endif //vtkCellIterator_h
vtkIdType GetNumberOfFaces()
Return the number of faces in the current cell.
abstract base class for most VTK objects
Definition: vtkObject.h:59
void PrintSelf(ostream &os, vtkIndent indent) override
Methods invoked by print to print information about the object including superclasses.
vtkPoints * Points
int vtkIdType
Definition: vtkType.h:347
provides thread-safe access to cells
void GoToNextCell()
Increment to next cell.
a simple class to control print indentation
Definition: vtkIndent.h:39
list of point or cell ids
Definition: vtkIdList.h:36
vtkIdList * GetPointIds()
Get the ids of the points in the current cell.
vtkIdList * GetFaces()
Get the faces for a polyhedral cell.
virtual void FetchFaces()
Lookup the cell faces in the data set and store them in this->Points.
int GetCellType()
Get the current cell type (e.g.
vtkPoints * GetPoints()
Get the points in the current cell.
vtkIdList * Faces
Efficient cell iterator for vtkDataSet topologies.
vtkIdList * PointIds
represent and manipulate 3D points
Definition: vtkPoints.h:39
vtkIdType GetNumberOfPoints()
Return the number of points in the current cell.