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             : // Local includes
      21             : #include "libmesh/quadrature_grid.h"
      22             : #include "libmesh/enum_to_string.h"
      23             : 
      24             : namespace libMesh
      25             : {
      26             : 
      27        1278 : void QGrid::init_2D()
      28             : {
      29             : #if LIBMESH_DIM > 1
      30             : 
      31        1278 :   switch (_type)
      32             :     {
      33             : 
      34             : 
      35             :       //---------------------------------------------
      36             :       // Quadrilateral quadrature rules
      37         639 :     case QUAD4:
      38             :     case QUADSHELL4:
      39             :     case QUAD8:
      40             :     case QUADSHELL8:
      41             :     case QUAD9:
      42             :     case QUADSHELL9:
      43             :       {
      44             :         // We compute the 2D quadrature rule as a tensor
      45             :         // product of the 1D quadrature rule.
      46             :         //
      47             :         // We ignore p_level in QGrid, since the "order" here is a
      48             :         // user-requested number of grid points, nothing to do with
      49             :         // the order of exactly-integrated polynomial spaces
      50         657 :         QGrid q1D(1, _order);
      51         639 :         tensor_product_quad( q1D );
      52          18 :         return;
      53             :       }
      54             : 
      55             : 
      56             :       //---------------------------------------------
      57             :       // Triangle quadrature rules
      58         639 :     case TRI3:
      59             :     case TRISHELL3:
      60             :     case TRI3SUBDIVISION:
      61             :     case TRI6:
      62             :     case TRI7:
      63             :       {
      64         639 :         const unsigned int np = (_order + 1)*(_order + 2)/2;
      65         639 :         const Real weight = Real(0.5)/np;
      66         639 :         const Real dx = Real(1)/(_order+1);
      67         639 :         _points.resize(np);
      68         639 :         _weights.resize(np);
      69             : 
      70          18 :         unsigned int pt = 0;
      71        4491 :         for (int i = 0; i != _order + 1; ++i)
      72             :           {
      73       19383 :             for (int j = 0; j != _order + 1 - i; ++j)
      74             :               {
      75       15549 :                 _points[pt](0) = (i+0.5)*dx;
      76       15549 :                 _points[pt](1) = (j+0.5)*dx;
      77       15549 :                 _weights[pt] = weight;
      78       15549 :                 pt++;
      79             :               }
      80             :           }
      81          18 :         return;
      82             :       }
      83             : 
      84             :       //---------------------------------------------
      85             :       // Unsupported type
      86           0 :     default:
      87           0 :       libmesh_error_msg("Element type not supported!:" << Utility::enum_to_string(_type));
      88             :     }
      89             : #endif
      90             : }
      91             : 
      92             : } // namespace libMesh