--- /dev/null
+// ---------------------------------------------------------------------
+// $Id$
+//
+// Copyright (C) 2003 - 2013 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, 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.
+// The full text of the license can be found in the file LICENSE at
+// the top level of the deal.II distribution.
+//
+// ---------------------------------------------------------------------
+
+//
+// Test
+// DoFTools::
+// make_periodicity_constraints (const FaceIterator &,
+// const FaceIterator &,
+// dealii::ConstraintMatrix &,
+// const std::vector<bool> &,
+// bool, bool, bool)
+// for correct behaviour on non standard oriented meshes.
+//
+// like _21_b_x but use a Q3 element. For this, the face_flip has a
+// tricky component in that we need not only flip the two vertics of
+// the line, but also revert the order of the dofs located on the line
+// itself
+//
+// at the time of writing this test, this does not work correctly. the
+// mesh looks like this:
+//
+// 17-25-24-16
+// | |
+// 22 . . 20
+// | |
+// 23 . . 21
+// | |
+// 19-27-26-18
+//
+//
+// 2--10-11--3
+// | |
+// 5 . . 7
+// | |
+// 4 . . 6
+// | |
+// 0---8--9--1
+//
+// we try to match line 0->1 against line 16->17 (not the line
+// orientation) against each other, with face_flip=true. this should
+// produce constraints
+// 16->1
+// 17->0
+// 24->9
+// 25->8
+// but at the time of writing the test, it gives
+// 24->8
+// 25->9
+// instead
+
+
+#include "../tests.h"
+#include <deal.II/base/logstream.h>
+#include <deal.II/dofs/dof_handler.h>
+#include <deal.II/dofs/dof_tools.h>
+#include <deal.II/fe/fe_q.h>
+#include <deal.II/fe/fe_system.h>
+#include <deal.II/fe/component_mask.h>
+#include <deal.II/fe/mapping_q.h>
+#include <deal.II/grid/grid_tools.h>
+#include <deal.II/grid/tria.h>
+#include <deal.II/lac/constraint_matrix.h>
+
+#include <iostream>
+#include <utility>
+
+#include <fstream>
+std::ofstream logfile("dof_tools_21_b_x_q3/output");
+
+using namespace dealii;
+
+
+
+/*
+ * Generate a grid consisting of two disjoint cells, colorize the two
+ * outermost faces. They will be matched via collect_periodic_face_pairs
+ *
+ * The integer orientation determines the orientation of the second cell
+ * to get something else than the boring default orientation.
+ */
+
+/* The 2D case */
+void generate_grid(Triangulation<2> &triangulation)
+{
+ Point<2> vertices_1[]
+ =
+ {
+ Point<2> (-1.,-3.),
+ Point<2> (+1.,-3.),
+ Point<2> (-1.,-1.),
+ Point<2> (+1.,-1.),
+ Point<2> (-1.,+1.),
+ Point<2> (+1.,+1.),
+ Point<2> (-1.,+3.),
+ Point<2> (+1.,+3.),
+ };
+ std::vector<Point<2> > vertices (&vertices_1[0], &vertices_1[8]);
+
+ std::vector<CellData<2> > cells (2, CellData<2>());
+
+ /* cell 0 */
+ int cell_vertices_0[GeometryInfo<2>::vertices_per_cell] = {0, 1, 2, 3};
+
+ /* cell 1 */
+ int cell_vertices_1[GeometryInfo<2>::vertices_per_cell] = {7,6,5,4};
+
+ for (unsigned int j=0; j<GeometryInfo<2>::vertices_per_cell; ++j)
+ {
+ cells[0].vertices[j] = cell_vertices_0[j];
+ cells[1].vertices[j] = cell_vertices_1[j];
+ }
+ cells[0].material_id = 0;
+ cells[1].material_id = 0;
+
+ triangulation.create_triangulation(vertices, cells, SubCellData());
+
+ Triangulation<2>::cell_iterator cell_1 = triangulation.begin();
+ Triangulation<2>::cell_iterator cell_2 = cell_1++;
+ Triangulation<2>::face_iterator face_1;
+ Triangulation<2>::face_iterator face_2;
+
+ // Look for the two outermost faces:
+ for (unsigned int j=0; j<GeometryInfo<2>::faces_per_cell; ++j)
+ {
+ if (cell_1->face(j)->center()(1) > 2.9)
+ face_1 = cell_1->face(j);
+ if (cell_2->face(j)->center()(1) < -2.9)
+ face_2 = cell_2->face(j);
+ }
+ face_1->set_boundary_indicator(42);
+ face_2->set_boundary_indicator(43);
+}
+
+
+/*
+ * Print out all face DoFs and support points as well as the actual
+ * matching via make_periodicity_constraints
+ */
+template<int dim>
+void print_matching(DoFHandler<dim> &dof_handler)
+{
+ const FiniteElement<dim> &fe = dof_handler.get_fe();
+ MappingQ<dim> mapping(1);
+
+ ConstraintMatrix constraint_matrix;
+ std::vector<Point<dim> > support_points(dof_handler.n_dofs());
+ DoFTools::map_dofs_to_support_points<dim>(mapping, dof_handler, support_points);
+
+ // Look for the two outermost faces:
+ typename DoFHandler<dim>::face_iterator face_1 = (++dof_handler.begin(0))->face(2);
+ typename DoFHandler<dim>::face_iterator face_2 = dof_handler.begin(0)->face(2);
+
+ // Determine the orientation of the two faces:
+
+ std::vector<types::global_dof_index> dofs_1(fe.dofs_per_face);
+ std::vector<types::global_dof_index> dofs_2(fe.dofs_per_face);
+ face_1->get_dof_indices(dofs_1);
+ face_2->get_dof_indices(dofs_2);
+
+ // Print out all DoF support points on the two faces:
+ deallog << "DoFs of face_1:" << std::endl;
+ for (unsigned int i = 0; i < fe.dofs_per_face; ++i)
+ deallog << dofs_1[i] << " is located at "
+ << support_points[dofs_1[i]] << std::endl;
+ deallog << "DoFs of face_2:" << std::endl;
+ for (unsigned int i = 0; i < fe.dofs_per_face; ++i)
+ deallog << dofs_2[i] << " is located at "
+ << support_points[dofs_2[i]] << std::endl;
+
+
+ std::bitset<3> orientation;
+ orientation[0] = 1;
+ orientation[1] = 1;
+ orientation[2] = 0;
+
+ DoFTools::make_periodicity_constraints (face_1,
+ face_2,
+ constraint_matrix,
+ ComponentMask(),
+ orientation[0], orientation[1], orientation[2]);
+ constraint_matrix.print(deallog.get_file_stream());
+ constraint_matrix.close();
+ deallog << "Matching:" << std::endl;
+}
+
+
+
+int main()
+{
+ deallog << std::setprecision(4);
+ logfile << std::setprecision(4);
+ deallog.attach(logfile);
+ deallog.depth_console(0);
+ deallog.threshold_double(1.e-10);
+
+ // Generate a triangulation and match:
+ Triangulation<2> triangulation;
+ FE_Q<2> fe(3);
+ DoFHandler<2> dof_handler;
+
+ generate_grid(triangulation);
+ dof_handler.initialize(triangulation, fe);
+ print_matching(dof_handler);
+
+ return 0;
+}
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