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_GRID_H
      21             : #define LIBMESH_QUADRATURE_GRID_H
      22             : 
      23             : // Local includes
      24             : #include "libmesh/quadrature.h"
      25             : 
      26             : namespace libMesh
      27             : {
      28             : 
      29             : /**
      30             :  * This class creates quadrature points on a uniform grid, with
      31             :  * order+1 points on an edge.
      32             :  *
      33             :  * Unlike most libMesh quadrature rules, QGrid does *not* reduce the
      34             :  * integration error exponentially on smooth functions as you increase
      35             :  * the quadrature order.  Instead, it reduces the error quadratically.
      36             :  * However, this error reduction is more reliable on non-smooth
      37             :  * functions.
      38             :  *
      39             :  * This quadrature type may be useful if you are integrating functions
      40             :  * which have discontinuities or discontinuous derivatives on scales
      41             :  * smaller than your element size.
      42             :  *
      43             :  * \author Roy Stogner
      44             :  * \date 2005
      45             :  * \brief Implements grid-based quadrature rules suitable for non-smooth functions.
      46             :  */
      47             : class QGrid final : public QBase
      48             : {
      49             : public:
      50             : 
      51             :   /**
      52             :    * Constructor.  Declares the order of the quadrature rule.
      53             :    */
      54      166682 :   QGrid (unsigned int dim,
      55      166682 :          Order order=INVALID_ORDER) :
      56      166682 :     QBase(dim, order)
      57             :   {
      58      166682 :     if (dim == 1)
      59        2556 :       init(EDGE2);
      60      166682 :   }
      61             : 
      62             :   /**
      63             :    * Copy/move ctor, copy/move assignment operator, and destructor are
      64             :    * all explicitly defaulted for this simple class.
      65             :    */
      66           0 :   QGrid (const QGrid &) = default;
      67             :   QGrid (QGrid &&) = default;
      68             :   QGrid & operator= (const QGrid &) = default;
      69             :   QGrid & operator= (QGrid &&) = default;
      70      166844 :   virtual ~QGrid() = default;
      71             : 
      72             :   /**
      73             :    * \returns \p QGRID.
      74             :    */
      75             :   virtual QuadratureType type() const override;
      76             : 
      77             :   virtual std::unique_ptr<QBase> clone() const override;
      78             : 
      79             : private:
      80             : 
      81             :   virtual void init_1D () override;
      82             :   virtual void init_2D () override;
      83             :   virtual void init_3D () override;
      84             : };
      85             : 
      86             : } // namespace libMesh
      87             : 
      88             : #endif // LIBMESH_QUADRATURE_GRID_H