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Use meshfunction to mark subdomains
author Eugenio Gianniti <eugenio.gianniti@mail.polimi.it>
date Thu, 07 Aug 2014 19:21:36 +0200
parents 598c5e9e0a9e
children 41b76530fe5e
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1 /*
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2 Copyright (C) 2014 Eugenio Gianniti <eugenio.gianniti@mail.polimi.it>
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3
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4 This program is free software; you can redistribute it and/or modify it under
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5 the terms of the GNU General Public License as published by the Free Software
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6 Foundation; either version 3 of the License, or (at your option) any later
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7 version.
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8
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9 This program is distributed in the hope that it will be useful, but WITHOUT
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10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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12 details.
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13
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14 You should have received a copy of the GNU General Public License along with
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15 this program; if not, see <http://www.gnu.org/licenses/>.
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16 */
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17
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18 #include <dolfin.h>
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19 #include "mesh.h"
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20 #include "meshfunction.h"
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21 #include "dolfin_compat.h"
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22
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23 DEFUN_DLD (MeshFunction, args, nargout, "-*- texinfo -*-\n\
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24 @deftypefn {Function File} {[@var{meshfunc}]} = \
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25 MeshFunction (@var{Mesh}, @var{filename})\n\
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26 @deftypefnx {Function File} {[@var{meshfunc}]} = \
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27 MeshFunction (@var{type}, @var{Mesh}, @var{filename})\n\
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28 Initialize a meshfunction with the values contained in a XDMF file.\n\
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29 The output @var{meshfunc} is an object which contains a representation of the \
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30 meshfunction in @var{filename} which can be used to mark subdomains or \
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31 facets where Dirichlet boundary conditions are to be applied.\n\
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32 Optionally, you can set a label identifying the @var{type} of markers, \
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33 in order to use @var{meshfunc} to mark subdomains in BilinearForm or \
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34 LinearForm. Three labels are recognized: ""dx"" for cell markers, \
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35 ""ds"" for exterior facets and ""dS"" for interior facets.\n\
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36 @seealso{DirichletBC, save, BilinearForm, LinearForm}\n\
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37 @end deftypefn")
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38 {
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39
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40 int nargin = args.length ();
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41 octave_value retval;
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42
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43 if (nargin < 2 || nargin > 3 || nargout > 1)
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44 print_usage ();
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45 else
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46 {
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47 if (! mesh_type_loaded)
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48 {
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49 mesh::register_type ();
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50 mesh_type_loaded = true;
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51 mlock ();
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52 }
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53
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54 if (! meshfunction_type_loaded)
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55 {
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56 meshfunction::register_type ();
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57 meshfunction_type_loaded = true;
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58 mlock ();
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59 }
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60
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61 octave_idx_type offset = 0;
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62 std::string label;
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63
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64 if (args(0).is_string ())
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65 {
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66 label = args(0).string_value ();
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67 offset = 1;
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68 }
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69
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70 if (args(0 + offset).type_id () == mesh::static_type_id ()
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71 && args(1 + offset).is_string ())
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72 {
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73 std::string filename = args(1 + offset).string_value ();
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74 mesh const & msh_arg =
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75 static_cast<mesh const &> (args(0 + offset).get_rep ());
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76
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77 if (!error_state)
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78 {
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79 SHARED_PTR <dolfin::Mesh const> const &
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80 pmsh = msh_arg.get_pmsh ();
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81 filename += ".xdmf";
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82
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83 try
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84 { retval = new meshfunction (label, pmsh, filename); }
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85 catch (std::runtime_error &)
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86 { error ("error reading file"); }
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87 }
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88 }
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89 else
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90 error ("invalid input arguments");
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91 }
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92
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93 return retval;
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94 }