vtkQuadraticTriangle.h

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

  Program:   Visualization Toolkit
  Module:    vtkQuadraticTriangle.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 vtkQuadraticTriangle_h
#define vtkQuadraticTriangle_h

#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkNonLinearCell.h"

class vtkQuadraticEdge;
class vtkTriangle;
class vtkDoubleArray;

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


  int GetCellType() override {return VTK_QUADRATIC_TRIANGLE;};
  int GetCellDimension() override {return 2;}
  int GetNumberOfEdges() override {return 3;}
  int GetNumberOfFaces() override {return 0;}
  vtkCell *GetEdge(int edgeId) override;
  vtkCell *GetFace(int) override {return nullptr;}

  int CellBoundary(int subId, const double pcoords[3], vtkIdList *pts) override;
  void Contour(double value, vtkDataArray *cellScalars,
               vtkIncrementalPointLocator *locator, vtkCellArray *verts,
               vtkCellArray *lines, vtkCellArray *polys,
               vtkPointData *inPd, vtkPointData *outPd,
               vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd) override;
  int EvaluatePosition(const double x[3], double closestPoint[3],
                       int& subId, double pcoords[3],
                       double& dist2, double weights[]) override;
  void EvaluateLocation(int& subId, const double pcoords[3], double x[3],
                        double *weights) override;
  int Triangulate(int index, vtkIdList *ptIds, vtkPoints *pts) override;
  void Derivatives(int subId, const double pcoords[3], const double *values,
                   int dim, double *derivs) override;
  double *GetParametricCoords() override;

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

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


  int GetParametricCenter(double pcoords[3]) override;

  double GetParametricDistance(const double pcoords[3]) override;

  static void InterpolationFunctions(const double pcoords[3], double weights[6]);
  static void InterpolationDerivs(const double pcoords[3], double derivs[12]);

  void InterpolateFunctions(const double pcoords[3], double weights[6]) override
  {
    vtkQuadraticTriangle::InterpolationFunctions(pcoords,weights);
  }
  void InterpolateDerivs(const double pcoords[3], double derivs[12]) override
  {
    vtkQuadraticTriangle::InterpolationDerivs(pcoords,derivs);
  }

protected:
  vtkQuadraticTriangle();
  ~vtkQuadraticTriangle() override;

  vtkQuadraticEdge *Edge;
  vtkTriangle      *Face;
  vtkDoubleArray    *Scalars; //used to avoid New/Delete in contouring/clipping

private:
  vtkQuadraticTriangle(const vtkQuadraticTriangle&) = delete;
  void operator=(const vtkQuadraticTriangle&) = delete;
};
//----------------------------------------------------------------------------
inline int vtkQuadraticTriangle::GetParametricCenter(double pcoords[3])
{
  pcoords[0] = pcoords[1] = 1./3;
  pcoords[2] = 0.0;
  return 0;
}


#endif