---

Common/vtkCell.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkCell.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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 vtkPointLocator;
class vtkPoints;

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

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

#ifndef VTK_REMOVE_LEGACY_CODE

  virtual vtkCell* MakeObject();
#endif

  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;}

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

  int 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, float pcoords[3], vtkIdList *pts) = 0;


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


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


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


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


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

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


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


  void GetBounds(float bounds[6]);


  float *GetBounds();


  float GetLength2();


  virtual int GetParametricCenter(float pcoords[3]);



  static char HitBBox(float bounds[6], float origin[3], float dir[3], 
                      float coord[3], float& t);

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

protected:
  vtkCell();
  ~vtkCell();

  float Bounds[6];
private:
  vtkCell(const vtkCell&);  // Not implemented.
  void operator=(const vtkCell&);  // Not implemented.
};

#endif

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