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

  Program:   Visualization Toolkit
  Module:    vtkQuadraticHexahedron.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.

=========================================================================*/
/**
 * @class   vtkQuadraticHexahedron
 * @brief   cell represents a parabolic, 20-node isoparametric hexahedron
 *
 * vtkQuadraticHexahedron is a concrete implementation of vtkNonLinearCell to
 * represent a three-dimensional, 20-node isoparametric parabolic
 * hexahedron. The interpolation is the standard finite element, quadratic
 * isoparametric shape function. The cell includes a mid-edge node. The
 * ordering of the twenty points defining the cell is point ids (0-7,8-19)
 * where point ids 0-7 are the eight corner vertices of the cube; followed by
 * twelve midedge nodes (8-19). Note that these midedge nodes correspond lie
 * on the edges defined by (0,1), (1,2), (2,3), (3,0), (4,5), (5,6), (6,7),
 * (7,4), (0,4), (1,5), (2,6), (3,7).
 *
 * @sa
 * vtkQuadraticEdge vtkQuadraticTriangle vtkQuadraticTetra
 * vtkQuadraticQuad vtkQuadraticPyramid vtkQuadraticWedge
 */

#ifndef vtkQuadraticHexahedron_h
#define vtkQuadraticHexahedron_h

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

class vtkQuadraticEdge;
class vtkQuadraticQuad;
class vtkHexahedron;
class vtkDoubleArray;

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

  //@{
  /**
   * Implement the vtkCell API. See the vtkCell API for descriptions
   * of these methods.
   */
  int GetCellType() override { return VTK_QUADRATIC_HEXAHEDRON; }
  int GetCellDimension() override { return 3; }
  int GetNumberOfEdges() override { return 12; }
  int GetNumberOfFaces() override { return 6; }
  vtkCell* GetEdge(int) override;
  vtkCell* GetFace(int) override;
  //@}

  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;

  /**
   * Clip this quadratic hexahedron using scalar value provided. Like
   * contouring, except that it cuts the hex to produce linear
   * tetrahedron.
   */
  void Clip(double value, vtkDataArray* cellScalars, vtkIncrementalPointLocator* locator,
    vtkCellArray* tetras, vtkPointData* inPd, vtkPointData* outPd, vtkCellData* inCd,
    vtkIdType cellId, vtkCellData* outCd, int insideOut) override;

  /**
   * Line-edge intersection. Intersection has to occur within [0,1] parametric
   * coordinates and with specified tolerance.
   */
  int IntersectWithLine(const double p1[3], const double p2[3], double tol, double& t, double x[3],
    double pcoords[3], int& subId) override;

  static void InterpolationFunctions(const double pcoords[3], double weights[20]);
  static void InterpolationDerivs(const double pcoords[3], double derivs[60]);
  //@{
  /**
   * Compute the interpolation functions/derivatives
   * (aka shape functions/derivatives)
   */
  void InterpolateFunctions(const double pcoords[3], double weights[20]) override
  {
    vtkQuadraticHexahedron::InterpolationFunctions(pcoords, weights);
  }
  void InterpolateDerivs(const double pcoords[3], double derivs[60]) override
  {
    vtkQuadraticHexahedron::InterpolationDerivs(pcoords, derivs);
  }
  //@}
  //@{
  /**
   * Return the ids of the vertices defining edge/face (`edgeId`/`faceId').
   * Ids are related to the cell, not to the dataset.
   *
   * @note The return type changed. It used to be int*, it is now const vtkIdType*.
   * This is so ids are unified between vtkCell and vtkPoints.
   */
  static const vtkIdType* GetEdgeArray(vtkIdType edgeId);
  static const vtkIdType* GetFaceArray(vtkIdType faceId);
  //@}

  /**
   * Given parametric coordinates compute inverse Jacobian transformation
   * matrix. Returns 9 elements of 3x3 inverse Jacobian plus interpolation
   * function derivatives.
   */
  void JacobianInverse(const double pcoords[3], double** inverse, double derivs[60]);

protected:
  vtkQuadraticHexahedron();
  ~vtkQuadraticHexahedron() override;

  vtkQuadraticEdge* Edge;
  vtkQuadraticQuad* Face;
  vtkHexahedron* Hex;
  vtkPointData* PointData;
  vtkCellData* CellData;
  vtkDoubleArray* CellScalars;
  vtkDoubleArray* Scalars;

  void Subdivide(
    vtkPointData* inPd, vtkCellData* inCd, vtkIdType cellId, vtkDataArray* cellScalars);

private:
  vtkQuadraticHexahedron(const vtkQuadraticHexahedron&) = delete;
  void operator=(const vtkQuadraticHexahedron&) = delete;
};

#endif
