dox/Filtering/vtkCell.h

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

  Program:   Visualization Toolkit
  Module:    vtkCell.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 __vtkCell_h
#define __vtkCell_h

#define VTK_CELL_SIZE 512
#define VTK_TOL 1.e-05 // Tolerance for geometric calculation

#include "vtkObject.h"

#include "vtkIdList.h" // Needed for inline methods
#include "vtkCellType.h" // Needed to define cell types

class vtkCellArray;
class vtkCellData;
class vtkDataArray;
class vtkPointData;
class vtkIncrementalPointLocator;
class vtkPoints;

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

  void Initialize(int npts, vtkIdType *pts, vtkPoints *p);

  virtual void ShallowCopy(vtkCell *c);

  virtual void DeepCopy(vtkCell *c);

  virtual int GetCellType() = 0;

  virtual int GetCellDimension() = 0;

  virtual int IsLinear() {return 1;}


  virtual int RequiresInitialization() {return 0;}
  virtual void Initialize() {}

  virtual int IsExplicitCell() {return 0;}


  virtual int RequiresExplicitFaceRepresentation() {return 0;}
  virtual void SetFaces(vtkIdType *vtkNotUsed(faces)) {}
  virtual vtkIdType *GetFaces() {return NULL;}

  vtkPoints *GetPoints() {return this->Points;}

  vtkIdType GetNumberOfPoints() {return this->PointIds->GetNumberOfIds();}

  virtual int GetNumberOfEdges() = 0;

  virtual int GetNumberOfFaces() = 0;

  vtkIdList *GetPointIds() {return this->PointIds;}

  vtkIdType GetPointId(int ptId) {return this->PointIds->GetId(ptId);}

  virtual vtkCell *GetEdge(int edgeId) = 0;

  virtual vtkCell *GetFace(int faceId) = 0;

  virtual int CellBoundary(int subId, double pcoords[3], vtkIdList *pts) = 0;


  virtual int EvaluatePosition(double x[3], double* closestPoint, 
                               int& subId, double pcoords[3], 
                               double& dist2, double *weights) = 0;


  virtual void EvaluateLocation(int& subId, double pcoords[3], 
                                double x[3], double *weights) = 0;


  virtual void Contour(double value, vtkDataArray *cellScalars, 
                       vtkIncrementalPointLocator *locator, vtkCellArray *verts,
                       vtkCellArray *lines, vtkCellArray *polys, 
                       vtkPointData *inPd, vtkPointData *outPd,
                       vtkCellData *inCd, vtkIdType cellId,
                       vtkCellData *outCd) = 0;


  virtual void Clip(double value, vtkDataArray *cellScalars, 
                    vtkIncrementalPointLocator *locator, vtkCellArray *connectivity,
                    vtkPointData *inPd, vtkPointData *outPd,
                    vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd, 
                    int insideOut) = 0;


  virtual int IntersectWithLine(double p1[3], double p2[3], 
                                double tol, double& t, double x[3], 
                                double pcoords[3], int& subId) = 0;

  virtual int Triangulate(int index, vtkIdList *ptIds, vtkPoints *pts) = 0;


  virtual void Derivatives(int subId, double pcoords[3], double *values, 
                           int dim, double *derivs) = 0;


  void GetBounds(double bounds[6]);


  double *GetBounds();


  double GetLength2();


  virtual int GetParametricCenter(double pcoords[3]);


  virtual double GetParametricDistance(double pcoords[3]);


  virtual int IsPrimaryCell() {return 1;}


  virtual double *GetParametricCoords();


  virtual void InterpolateFunctions(double pcoords[3], double weights[3])
    {
    (void)pcoords;
    (void)weights;
    }
  virtual void InterpolateDerivs(double pcoords[3], double derivs[3])
    {
    (void)pcoords;
    (void)derivs;
    }

  // left public for quick computational access
  vtkPoints *Points;
  vtkIdList *PointIds;

protected:
  vtkCell();
  ~vtkCell();

  double Bounds[6];

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

#endif

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