Line data    Source code

       1             : // The libMesh Finite Element Library.
       2             : // Copyright (C) 2002-2025 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
       3             : 
       4             : // This library is free software; you can redistribute it and/or
       5             : // modify it under the terms of the GNU Lesser General Public
       6             : // License as published by the Free Software Foundation; either
       7             : // version 2.1 of the License, or (at your option) any later version.
       8             : 
       9             : // This library is distributed in the hope that it will be useful,
      10             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             : // Lesser General Public License for more details.
      13             : 
      14             : // You should have received a copy of the GNU Lesser General Public
      15             : // License along with this library; if not, write to the Free Software
      16             : // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
      17             : 
      18             : 
      19             : 
      20             : #ifndef LIBMESH_QUADRATURE_GAUSS_H
      21             : #define LIBMESH_QUADRATURE_GAUSS_H
      22             : 
      23             : // Local includes
      24             : #include "libmesh/quadrature.h"
      25             : 
      26             : namespace libMesh
      27             : {
      28             : 
      29             : /**
      30             :  * This class implements specific orders of Gauss quadrature.  The
      31             :  * rules of Order \p p are capable of integrating polynomials of
      32             :  * degree \p p exactly.
      33             :  *
      34             :  * \author Benjamin Kirk
      35             :  * \author John W. Peterson
      36             :  * \date 2003
      37             :  * \brief Implements 1, 2, and 3D "Gaussian" quadrature rules.
      38             :  */
      39             : class QGauss : public QBase
      40             : {
      41             : public:
      42             : 
      43             :   /**
      44             :    * Constructor.  Declares the order of the quadrature rule.  We
      45             :    * explicitly call the \p init function in 1D since the other
      46             :    * tensor-product rules require this one.
      47             :    *
      48             :    * \note The element type, EDGE2, will not be used internally,
      49             :    * however if we called the function with INVALID_ELEM it would try
      50             :    * to be smart and return, thinking it had already done the work.
      51             :    */
      52    10979895 :   QGauss (unsigned int dim,
      53    11017562 :           Order order=INVALID_ORDER) :
      54    11017562 :     QBase(dim, order)
      55             :   {
      56    10979895 :     if (dim == 1)
      57     5185366 :       init(EDGE2);
      58    10979895 :   }
      59             : 
      60             :   /**
      61             :    * Copy/move ctor, copy/move assignment operator, and destructor are
      62             :    * all explicitly defaulted for this simple class.
      63             :    */
      64           0 :   QGauss (const QGauss &) = default;
      65             :   QGauss (QGauss &&) = default;
      66             :   QGauss & operator= (const QGauss &) = default;
      67             :   QGauss & operator= (QGauss &&) = default;
      68     5250891 :   virtual ~QGauss() = default;
      69             : 
      70             :   /**
      71             :    * \returns \p QGAUSS.
      72             :    */
      73             :   virtual QuadratureType type() const override;
      74             : 
      75             :   virtual std::unique_ptr<QBase> clone() const override;
      76             : 
      77             : private:
      78             : 
      79             :   virtual void init_1D () override;
      80             :   virtual void init_2D () override;
      81             :   virtual void init_3D () override;
      82             : 
      83             :   /**
      84             :    * The Dunavant rules are for triangles. This function takes
      85             :    * permutation points and weights in a specific format as input and
      86             :    * fills the _points and _weights vectors.
      87             :    */
      88             :   void dunavant_rule(const Real rule_data[][4],
      89             :                      const unsigned int n_pts);
      90             : 
      91             :   void dunavant_rule2(const Real * wts,
      92             :                       const Real * a,
      93             :                       const Real * b,
      94             :                       const unsigned int * permutation_ids,
      95             :                       const unsigned int n_wts);
      96             : 
      97             :   /**
      98             :    * The Keast rules are for tets. This function takes permutation
      99             :    * points and weights in a specific format as input and fills the
     100             :    * _points and _weights vectors.
     101             :    */
     102             :   void keast_rule(const Real rule_data[][4],
     103             :                   const unsigned int n_pts);
     104             : };
     105             : 
     106             : } // namespace libMesh
     107             : 
     108             : #endif // LIBMESH_QUADRATURE_GAUSS_H