dox/Filtering/vtkPolyData.h

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

  Program:   Visualization Toolkit
  Module:    vtkPolyData.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 __vtkPolyData_h
#define __vtkPolyData_h

#include "vtkPointSet.h"

#include "vtkCellTypes.h" // Needed for inline methods
#include "vtkCellLinks.h" // Needed for inline methods

class vtkVertex;
class vtkPolyVertex;
class vtkLine;
class vtkPolyLine;
class vtkTriangle;
class vtkQuad;
class vtkPolygon;
class vtkTriangleStrip;
class vtkEmptyCell;

class VTK_FILTERING_EXPORT vtkPolyData : public vtkPointSet
{
public:
  static vtkPolyData *New();

  vtkTypeMacro(vtkPolyData,vtkPointSet);
  void PrintSelf(ostream& os, vtkIndent indent);

  int GetDataObjectType() {return VTK_POLY_DATA;}

  void CopyStructure(vtkDataSet *ds);


  vtkIdType GetNumberOfCells();
  vtkCell *GetCell(vtkIdType cellId);
  void GetCell(vtkIdType cellId, vtkGenericCell *cell);
  int GetCellType(vtkIdType cellId);
  void GetCellBounds(vtkIdType cellId, double bounds[6]);
  void GetCellNeighbors(vtkIdType cellId, vtkIdList *ptIds,
                        vtkIdList *cellIds);


  void CopyCells(vtkPolyData *pd, vtkIdList *idList,
                 vtkPointLocator *locator = NULL);
  
  void GetCellPoints(vtkIdType cellId, vtkIdList *ptIds);

  void GetPointCells(vtkIdType ptId, vtkIdList *cellIds);

  void ComputeBounds();
  
  void Squeeze();

  int GetMaxCellSize();

  void SetVerts (vtkCellArray* v);

  vtkCellArray *GetVerts();

  void SetLines (vtkCellArray* l);

  vtkCellArray *GetLines();

  void SetPolys (vtkCellArray* p);

  vtkCellArray *GetPolys();
  
  void SetStrips (vtkCellArray* s);

  vtkCellArray *GetStrips();


  vtkIdType GetNumberOfVerts();
  vtkIdType GetNumberOfLines();
  vtkIdType GetNumberOfPolys();
  vtkIdType GetNumberOfStrips();

  void Allocate(vtkIdType numCells=1000, int extSize=1000);


  void Allocate(vtkPolyData *inPolyData, vtkIdType numCells=1000, 
                int extSize=1000);

  int InsertNextCell(int type, int npts, vtkIdType *pts);

  int InsertNextCell(int type, vtkIdList *pts);

  void Reset();

  void BuildCells();

  void BuildLinks(int initialSize=0);

  void DeleteCells();

  void DeleteLinks();
  

  void GetPointCells(vtkIdType ptId, unsigned short& ncells,
                     vtkIdType* &cells);


  void GetCellEdgeNeighbors(vtkIdType cellId, vtkIdType p1, vtkIdType p2,
                            vtkIdList *cellIds);

  void GetCellPoints(vtkIdType cellId, vtkIdType& npts, vtkIdType* &pts);

  int IsTriangle(int v1, int v2, int v3);

  int IsEdge(vtkIdType p1, vtkIdType p2);

  int IsPointUsedByCell(vtkIdType ptId, vtkIdType cellId);

  void ReplaceCell(vtkIdType cellId, int npts, vtkIdType *pts);


  void ReplaceCellPoint(vtkIdType cellId, vtkIdType oldPtId,
                        vtkIdType newPtId);
  
  void ReverseCell(vtkIdType cellId);


  void DeletePoint(vtkIdType ptId);
  void DeleteCell(vtkIdType cellId);

  void RemoveDeletedCells();


  int InsertNextLinkedPoint(int numLinks); 
  int InsertNextLinkedPoint(double x[3], int numLinks); 
  
  int InsertNextLinkedCell(int type, int npts, vtkIdType *pts); 

  void ReplaceLinkedCell(vtkIdType cellId, int npts, vtkIdType *pts);

  void RemoveCellReference(vtkIdType cellId);

  void AddCellReference(vtkIdType cellId);

  void RemoveReferenceToCell(vtkIdType ptId, vtkIdType cellId);

  void AddReferenceToCell(vtkIdType ptId, vtkIdType cellId);

  void ResizeCellList(vtkIdType ptId, int size);

  virtual void Initialize();

  void GetUpdateExtent(int &piece, int &numPieces, int &ghostLevel);


  virtual int* GetUpdateExtent();
  virtual void GetUpdateExtent(int& x0, int& x1, int& y0, int& y1,
                               int& z0, int& z1);
  virtual void GetUpdateExtent(int extent[6]);


  virtual int GetPiece();
  virtual int GetNumberOfPieces();

  virtual int GetGhostLevel();
  
  unsigned long GetActualMemorySize();
  

  void ShallowCopy(vtkDataObject *src);  
  void DeepCopy(vtkDataObject *src);

  void RemoveGhostCells(int level);

  //BTX

  static vtkPolyData* GetData(vtkInformation* info);
  static vtkPolyData* GetData(vtkInformationVector* v, int i=0);
  //ETX


  enum
    {
    ERR_NO_SUCH_FIELD = -4,
    ERR_INCORRECT_FIELD = -3,
    ERR_NON_MANIFOLD_STAR = -2,
    REGULAR_POINT = -1,
    MINIMUM = 0,
    SADDLE = 1,
    MAXIMUM = 2
    };
  //ETX
  int GetScalarFieldCriticalIndex (vtkIdType pointId, 
                                   vtkDataArray *scalarField);
  int GetScalarFieldCriticalIndex (vtkIdType pointId, int fieldId);
  int GetScalarFieldCriticalIndex (vtkIdType pointId, const char* fieldName);

protected:
  vtkPolyData();
  ~vtkPolyData();

  // constant cell objects returned by GetCell called.
  vtkVertex *Vertex;
  vtkPolyVertex *PolyVertex;
  vtkLine *Line;
  vtkPolyLine *PolyLine;
  vtkTriangle *Triangle;
  vtkQuad *Quad;
  vtkPolygon *Polygon;
  vtkTriangleStrip *TriangleStrip;
  vtkEmptyCell *EmptyCell;
  
  // points inherited
  // point data (i.e., scalars, vectors, normals, tcoords) inherited
  vtkCellArray *Verts;
  vtkCellArray *Lines;
  vtkCellArray *Polys;
  vtkCellArray *Strips;

  // dummy static member below used as a trick to simplify traversal
  static vtkCellArray *Dummy;

  // supporting structures for more complex topological operations
  // built only when necessary
  vtkCellTypes *Cells;
  vtkCellLinks *Links;

  // This method is called during an update.  
  // If the CropFilter is set, the user reqquested a piece which the 
  // source cannot generate, then it will break up the
  // data set in order to satisfy the request.
  virtual void Crop();


private:
  // Hide these from the user and the compiler.
  

  void GetCellNeighbors(vtkIdType cellId, vtkIdList& ptIds, vtkIdList& cellIds)
    {this->GetCellNeighbors(cellId, &ptIds, &cellIds);}

  void Cleanup();

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

inline void vtkPolyData::GetPointCells(vtkIdType ptId, unsigned short& ncells, 
                                       vtkIdType* &cells)
{
  ncells = this->Links->GetNcells(ptId);
  cells = this->Links->GetCells(ptId);
}

inline int vtkPolyData::IsTriangle(int v1, int v2, int v3)
{
  unsigned short int n1;
  int i, j, tVerts[3];
  vtkIdType *cells, *tVerts2, n2;
  
  tVerts[0] = v1;
  tVerts[1] = v2;
  tVerts[2] = v3;

  for (i=0; i<3; i++) 
    {
    this->GetPointCells(tVerts[i], n1, cells);
    for (j=0; j<n1; j++) 
      {
      this->GetCellPoints(cells[j], n2, tVerts2);
      if ( (tVerts[0] == tVerts2[0] || tVerts[0] == tVerts2[1] ||
            tVerts[0] == tVerts2[2]) &&
           (tVerts[1] == tVerts2[0] || tVerts[1] == tVerts2[1] ||
            tVerts[1] == tVerts2[2]) &&
           (tVerts[2] == tVerts2[0] || tVerts[2] == tVerts2[1] ||
            tVerts[2] == tVerts2[2]) )
        {
        return 1;
        }
      }
    }
  return 0;
}

inline int vtkPolyData::IsPointUsedByCell(vtkIdType ptId, vtkIdType cellId)
{
  vtkIdType *pts, npts;
  
  this->GetCellPoints(cellId, npts, pts);
  for (vtkIdType i=0; i < npts; i++)
    {
    if ( pts[i] == ptId )
      {
      return 1;
      }
    }

  return 0;
}

inline void vtkPolyData::DeletePoint(vtkIdType ptId)
{
  this->Links->DeletePoint(ptId);
}

inline void vtkPolyData::DeleteCell(vtkIdType cellId)
{
  this->Cells->DeleteCell(cellId);
}

inline void vtkPolyData::RemoveCellReference(vtkIdType cellId)
{
  vtkIdType *pts, npts;
  
  this->GetCellPoints(cellId, npts, pts);
  for (vtkIdType i=0; i<npts; i++)
    {
    this->Links->RemoveCellReference(cellId, pts[i]);
    }
}

inline void vtkPolyData::AddCellReference(vtkIdType cellId)
{
  vtkIdType *pts, npts;
  
  this->GetCellPoints(cellId, npts, pts);
  for (vtkIdType i=0; i<npts; i++)
    {
    this->Links->AddCellReference(cellId, pts[i]);
    }
}

inline void vtkPolyData::ResizeCellList(vtkIdType ptId, int size)
{
  this->Links->ResizeCellList(ptId,size);
}

inline void vtkPolyData::ReplaceCellPoint(vtkIdType cellId, vtkIdType oldPtId,
                                          vtkIdType newPtId)
{
  int i;
  vtkIdType *verts, nverts;
  
  this->GetCellPoints(cellId,nverts,verts);
  for ( i=0; i < nverts; i++ )
    {
    if ( verts[i] == oldPtId ) 
      {
      verts[i] = newPtId; // this is very nasty! direct write!
      return;
      }
    }
}

#endif

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