dox/Filtering/vtkBiQuadraticQuad.h

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

  Program:   Visualization Toolkit
  Module:    vtkBiQuadraticQuad.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 __vtkBiQuadraticQuad_h
#define __vtkBiQuadraticQuad_h

#include "vtkNonLinearCell.h"

class vtkQuadraticEdge;
class vtkQuad;
class vtkTriangle;
class vtkDoubleArray;

class VTK_FILTERING_EXPORT vtkBiQuadraticQuad : public vtkNonLinearCell
{
public:
  static vtkBiQuadraticQuad *New ();
  vtkTypeMacro(vtkBiQuadraticQuad,vtkNonLinearCell);
  void PrintSelf (ostream & os, vtkIndent indent);


  int GetCellType () { return VTK_BIQUADRATIC_QUAD; }
  int GetCellDimension () { return 2; }
  int GetNumberOfEdges () { return 4; }
  int GetNumberOfFaces () { return 0; }
  vtkCell *GetEdge (int);
  vtkCell *GetFace (int) { return 0; }

  int CellBoundary (int subId, double pcoords[3], vtkIdList * pts);
  int EvaluatePosition (double x[3], double *closestPoint,
                        int &subId, double pcoords[3],
                        double &dist2, double *weights);
  void EvaluateLocation (int &subId, double pcoords[3], double x[3],
                         double *weights);
  int Triangulate (int index, vtkIdList * ptIds, vtkPoints * pts);
  void Derivatives (int subId, double pcoords[3], double *values,
                    int dim, double *derivs);
  virtual double *GetParametricCoords();

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


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


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

  int GetParametricCenter(double pcoords[3]);

  static void InterpolationFunctions (double pcoords[3], double weights[9]);
  static void InterpolationDerivs (double pcoords[3], double derivs[18]);

  virtual void InterpolateFunctions (double pcoords[3], double weights[9])
    {
    vtkBiQuadraticQuad::InterpolationFunctions(pcoords,weights);
    }
  virtual void InterpolateDerivs (double pcoords[3], double derivs[18])
    {
    vtkBiQuadraticQuad::InterpolationDerivs(pcoords,derivs);
    }

protected:
  vtkBiQuadraticQuad();
  ~vtkBiQuadraticQuad();

  vtkQuadraticEdge *Edge;
  vtkQuad          *Quad;
  vtkTriangle      *Triangle;
  vtkDoubleArray   *Scalars;

private:
  vtkBiQuadraticQuad(const vtkBiQuadraticQuad&);  // Not implemented.
  void operator=(const vtkBiQuadraticQuad&);  // Not implemented.
};
//----------------------------------------------------------------------------
inline int vtkBiQuadraticQuad::GetParametricCenter(double pcoords[3])
{
  pcoords[0] = pcoords[1] = 0.5;
  pcoords[2] = 0.;
  return 0;
}

#endif