---

Common/vtkTetra.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkTetra.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 __vtkTetra_h
#define __vtkTetra_h

#include "vtkCell3D.h"

class vtkLine;
class vtkTriangle;
class vtkUnstructuredGrid;

class VTK_COMMON_EXPORT vtkTetra : public vtkCell3D
{
public:
  static vtkTetra *New();
  vtkTypeRevisionMacro(vtkTetra,vtkCell3D);


  virtual void GetEdgePoints(int edgeId, int* &pts);
  virtual void GetFacePoints(int faceId, int* &pts);
  virtual float *GetParametricCoords();


  int GetCellType() {return VTK_TETRA;}
  int GetNumberOfEdges() {return 6;}
  int GetNumberOfFaces() {return 4;}
  vtkCell *GetEdge(int edgeId);
  vtkCell *GetFace(int faceId);
  void Contour(float value, vtkDataArray *cellScalars, 
               vtkPointLocator *locator, vtkCellArray *verts, 
               vtkCellArray *lines, vtkCellArray *polys,
               vtkPointData *inPd, vtkPointData *outPd,
               vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd);
  void Clip(float value, vtkDataArray *cellScalars, 
            vtkPointLocator *locator, vtkCellArray *connectivity,
            vtkPointData *inPd, vtkPointData *outPd,
            vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd, 
            int insideOut);
  int EvaluatePosition(float x[3], float* closestPoint,
                       int& subId, float pcoords[3],
                       float& dist2, float *weights);
  void EvaluateLocation(int& subId, float pcoords[3], float x[3],
                        float *weights);
  int IntersectWithLine(float p1[3], float p2[3], float tol, float& t,
                        float x[3], float pcoords[3], int& subId);
  int Triangulate(int index, vtkIdList *ptIds, vtkPoints *pts);
  void Derivatives(int subId, float pcoords[3], float *values, 
                   int dim, float *derivs);

  int CellBoundary(int subId, float pcoords[3], vtkIdList *pts);
  
  int GetParametricCenter(float pcoords[3]);


  static void TetraCenter(float p1[3], float p2[3], float p3[3], float p4[3], 
                          float center[3]);


  static double Circumsphere(double  p1[3], double p2[3], double p3[3], 
                             double p4[3], double center[3]);


  static double Insphere(double  p1[3], double p2[3], double p3[3], 
                         double p4[3], double center[3]);


  static int BarycentricCoords(double x[3], double  x1[3], double x2[3], 
                               double x3[3], double x4[3], double bcoords[4]);
  

  static double ComputeVolume(double  p1[3], double p2[3], double p3[3], 
                              double p4[3]);

  int JacobianInverse(double **inverse, float derivs[12]);


  static void InterpolationFunctions(float pcoords[3], float weights[4]);
  static void InterpolationDerivs(float derivs[12]);
  static int *GetEdgeArray(int edgeId);
  static int *GetFaceArray(int faceId);

protected:
  vtkTetra();
  ~vtkTetra();

  vtkLine *Line;
  vtkTriangle *Triangle;

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

inline int vtkTetra::GetParametricCenter(float pcoords[3])
{
  pcoords[0] = pcoords[1] = pcoords[2] = 0.25;
  return 0;
}

#endif

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