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Merge pull request #13027 from bangerth/face_number
Allow accessing face numbers in data postprocessors
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| Original file line number | Diff line number | Diff line change |
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| New: The DataPostprocessorInputs::CommonInputs class now also | ||
| stores the face number that is currently being worked on when | ||
| using a DataOutFaces object. This allows accessing face-related | ||
| data like the boundary id from a DataPostprocessor. | ||
| <br> | ||
| (Wolfgang Bangerth, 2021/12/03) |
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118 changes: 118 additions & 0 deletions
118
tests/data_out/data_out_faces_postprocessor_boundary_id.cc
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| // --------------------------------------------------------------------- | ||
| // | ||
| // Copyright (C) 2016 - 2018 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.md at | ||
| // the top level directory of deal.II. | ||
| // | ||
| // --------------------------------------------------------------------- | ||
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| // Tests DataPostprocessor: access the cell and face we are currently | ||
| // working on for a scalar finite element field and DataOutFaces. This | ||
| // is then used to output the boundary id of a face. | ||
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| #include <deal.II/base/function.h> | ||
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| #include <deal.II/dofs/dof_accessor.h> | ||
| #include <deal.II/dofs/dof_handler.h> | ||
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| #include <deal.II/fe/fe_dgq.h> | ||
| #include <deal.II/fe/fe_system.h> | ||
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| #include <deal.II/grid/grid_generator.h> | ||
| #include <deal.II/grid/tria.h> | ||
| #include <deal.II/grid/tria_accessor.h> | ||
| #include <deal.II/grid/tria_iterator.h> | ||
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| #include <deal.II/lac/vector.h> | ||
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| #include <deal.II/numerics/data_out_faces.h> | ||
| #include <deal.II/numerics/data_postprocessor.h> | ||
| #include <deal.II/numerics/matrix_tools.h> | ||
| #include <deal.II/numerics/vector_tools.h> | ||
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| #include "../tests.h" | ||
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| std::ofstream logfile("output"); | ||
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| template <int dim> | ||
| class BoundaryIds : public DataPostprocessorScalar<dim> | ||
| { | ||
| public: | ||
| BoundaryIds() | ||
| : DataPostprocessorScalar<dim>("boundary_id", update_quadrature_points) | ||
| {} | ||
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| virtual void | ||
| evaluate_scalar_field( | ||
| const DataPostprocessorInputs::Scalar<dim> &inputs, | ||
| std::vector<Vector<double>> &computed_quantities) const override | ||
| { | ||
| AssertDimension(computed_quantities.size(), inputs.solution_values.size()); | ||
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| // Get the cell and face we are currently dealing with: | ||
| const typename DoFHandler<dim>::active_cell_iterator cell = | ||
| inputs.template get_cell<dim>(); | ||
| const unsigned int face = inputs.get_face_number(); | ||
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| // Then fill the output fields with the boundary_id of the face | ||
| for (auto &output : computed_quantities) | ||
| { | ||
| AssertDimension(output.size(), 1); | ||
| output(0) = cell->face(face)->boundary_id(); | ||
| } | ||
| } | ||
| }; | ||
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| template <int dim> | ||
| void | ||
| test() | ||
| { | ||
| Triangulation<dim> triangulation; | ||
| FE_DGQ<dim> fe(1); | ||
| DoFHandler<dim> dof_handler(triangulation); | ||
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| GridGenerator::hyper_cube(triangulation, 0, 1, true); | ||
| triangulation.refine_global(1); | ||
| triangulation.begin_active()->set_refine_flag(); | ||
| triangulation.execute_coarsening_and_refinement(); | ||
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| dof_handler.distribute_dofs(fe); | ||
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| // Create a dummy vector. We will ignore its contents. | ||
| Vector<double> solution(dof_handler.n_dofs()); | ||
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| BoundaryIds<dim> p; | ||
| DataOutFaces<dim> data_out; | ||
| data_out.attach_dof_handler(dof_handler); | ||
| data_out.add_data_vector(solution, p); | ||
| data_out.build_patches(); | ||
| data_out.write_gnuplot(logfile); | ||
| } | ||
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| int | ||
| main() | ||
| { | ||
| logfile << std::setprecision(2); | ||
| deallog << std::setprecision(2); | ||
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| test<2>(); | ||
| test<2>(); | ||
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| return 0; | ||
| } |
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