face_quad.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2014 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef LIBMESH_FACE_QUAD_H
#define LIBMESH_FACE_QUAD_H


// Local includes
#include "libmesh/libmesh_common.h"
#include "libmesh/face.h"

// C++ includes

namespace libMesh
{


// Forward declarations


class Quad : public Face
{
public:

  Quad (const unsigned int nn, Elem* p, Node** nodelinkdata) :
    Face(nn, Quad::n_sides(), p, _elemlinks_data, nodelinkdata) {}

  unsigned int n_nodes() const { return 4; }

  unsigned int n_sides() const { return 4; }

  unsigned int n_vertices() const { return 4; }

  unsigned int n_edges() const { return 4; }

  unsigned int n_children() const { return 4; }

  /*
   * @returns true iff the specified child is on the
   * specified side
   */
  virtual bool is_child_on_side(const unsigned int c,
                                const unsigned int s) const;

  virtual unsigned int opposite_side(const unsigned int s) const;

  virtual unsigned int opposite_node(const unsigned int n,
                                     const unsigned int s) const;

  dof_id_type key (const unsigned int s) const;

  UniquePtr<Elem> side (const unsigned int i) const;

  Real quality (const ElemQuality q) const;

  std::pair<Real, Real> qual_bounds (const ElemQuality q) const;

protected:

  Elem* _elemlinks_data[5+(LIBMESH_DIM>2)];

  static const unsigned short int _second_order_adjacent_vertices[4][2];

  static const unsigned short int _second_order_vertex_child_number[9];

  static const unsigned short int _second_order_vertex_child_index[9];
};


// ------------------------------------------------------------
// Quad class member functions


} // namespace libMesh

#endif // LIBMESH_FACE_QUAD_H