quadrature_gm_2D.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 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
 
 
 
// Local includes
#include "libmesh/quadrature_gm.h"
#include "libmesh/enum_to_string.h"
 
namespace libMesh
{
 
void QGrundmann_Moller::init_2D()
{
  // Nearly all GM rules contain negative weights, so if you are not
  // allowing rules with negative weights, we cannot continue!
  libmesh_error_msg_if(!allow_rules_with_negative_weights,
                       "You requested a Grundmann-Moller rule but\n"
                       << "are not allowing rules with negative weights!\n"
                       << "Either select a different quadrature class or\n"
                       << "set allow_rules_with_negative_weights==true.");
 
  switch (_type)
    {
    case TRI3:
    case TRISHELL3:
    case TRI3SUBDIVISION:
    case TRI6:
    case TRI7:
      {
        switch(get_order())
          {
 
          default:
            {
              // Untested above _order=23 but should work...
              gm_rule(get_order()/2, /*dim=*/2);
              return;
            }
          } // end switch (order)
      } // end case TRI
 
    default:
      libmesh_error_msg("ERROR: Unsupported element type: " << Utility::enum_to_string(_type));
    } // end switch (_type)
}
 
} // namespace libMesh