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UsesCase_MEDmesh_1.c
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1 /* This file is part of MED.
2  *
3  * COPYRIGHT (C) 1999 - 2023 EDF R&D, CEA/DEN
4  * MED is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU Lesser General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  *
9  * MED 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
12  * GNU Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public License
15  * along with MED. If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 /*
19  * How to create an unstructured mesh
20  *
21  * Use case 1 : a 2D unstructured mesh with 15 nodes, 8 triangular cells, 4 triangular cells
22  */
23 
24 #include <med.h>
25 #define MESGERR 1
26 #include <med_utils.h>
27 
28 #include <string.h>
29 
30 int main (int argc, char **argv) {
31  med_idt fid;
32  const char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
33  const med_int spacedim = 2;
34  const med_int meshdim = 2;
35  /* 12345678901234561234567890123456 */
36  const char axisname[2*MED_SNAME_SIZE+1] = "x y ";
37  const char unitname[2*MED_SNAME_SIZE+1] = "cm cm ";
38  const med_float coordinates[30] = { 2.,1., 7.,1., 12.,1., 17.,1., 22.,1.,
39  2.,6., 7.,6., 12.,6., 17.,6., 22.,6.,
40  2.,11., 7.,11., 12.,11., 17.,11., 22.,11.};
41  const med_int nnodes = 15;
42  const med_int triaconnectivity[24] = { 1,7,6, 2,7,1, 3,7,2, 8,7,3,
43  13,7,8, 12,7,13, 11,7,12, 6,7,11 };
44  const med_int ntria3 = 8;
45  const med_int quadconnectivity[16] = {3,4,9,8, 4,5,10,9,
46  15,14,9,10, 13,8,9,14};
47  const med_int nquad4 = 4;
48  med_err ret=-1;
49 
50  /* open MED file */
51  fid = MEDfileOpen("UsesCase_MEDmesh_1.med",MED_ACC_CREAT);
52  if (fid < 0) {
53  MESSAGE("ERROR : file creation ...");
54  goto ERROR;
55  }
56 
57  /* write a comment in the file */
58  if (MEDfileCommentWr(fid,"A 2D unstructured mesh : 15 nodes, 12 cells") < 0) {
59  MESSAGE("ERROR : write file description ...");
60  goto ERROR;
61  }
62 
63  /* mesh creation : a 2D unstructured mesh */
64  if (MEDmeshCr(fid, meshname, spacedim, meshdim, MED_UNSTRUCTURED_MESH,
65  "A 2D unstructured mesh","",MED_SORT_DTIT,MED_CARTESIAN, axisname, unitname) < 0) {
66  MESSAGE("ERROR : mesh creation ...");
67  goto ERROR;
68  }
69 
70  /* nodes coordinates in a cartesian axis in full interlace mode
71  (X1,Y1, X2,Y2, X3,Y3, ...) with no iteration and computation step
72  */
73  if (MEDmeshNodeCoordinateWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0,
74  MED_FULL_INTERLACE, nnodes, coordinates) < 0) {
75  MESSAGE("ERROR : nodes coordinates ...");
76  goto ERROR;
77  }
78 
79  /* cells connectiviy is defined in nodal mode with no iteration and computation step */
81  MED_NODAL, MED_FULL_INTERLACE, ntria3, triaconnectivity) < 0) {
82  MESSAGE("ERROR : triangular cells connectivity ...");
83  goto ERROR;
84  }
86  MED_NODAL, MED_FULL_INTERLACE, nquad4, quadconnectivity) < 0) {
87  MESSAGE("ERROR : quadrangular cells connectivity ...");
88  goto ERROR;
89  }
90 
91  /* create family 0 : by default, all mesh entities family number is 0 */
92  if (MEDfamilyCr(fid, meshname,MED_NO_NAME, 0, 0, MED_NO_GROUP) < 0) {
93  MESSAGE("ERROR : family 0 creation ...");
94  goto ERROR;
95  }
96 
97  ret = 0;
98  ERROR :
99 
100  /* close MED file */
101  if (MEDfileClose(fid) < 0) {
102  MESSAGE("ERROR : close file ...");
103  return -1;
104  }
105 
106  return ret;
107 }
MED_NO_GROUP
#define MED_NO_GROUP
Definition: med.h:291
MED_TRIA3
#define MED_TRIA3
Definition: med.h:205
MED_UNSTRUCTURED_MESH
Definition: med.h:133
MED_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:84
med_idt
hid_t med_idt
Definition: med.h:333
med_err
herr_t med_err
Definition: med.h:334
MESSAGE
#define MESSAGE(chaine)
Definition: med_utils.h:324
MED_FULL_INTERLACE
Definition: med.h:98
med_int
int med_int
Definition: med.h:344
MED_SORT_DTIT
Definition: med.h:311
med_float
double med_float
Definition: med.h:338
MED_NO_DT
#define MED_NO_DT
Definition: med.h:322
MEDmeshElementConnectivityWr
MEDC_EXPORT med_err MEDmeshElementConnectivityWr(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_float dt, const med_entity_type entitype, const med_geometry_type geotype, const med_connectivity_mode cmode, const med_switch_mode switchmode, const med_int nentity, const med_int *const connectivity)
Cette routine permet d'écrire dans un maillage le tableau des connectivités pour un type géométrique ...
Definition: MEDmeshElementConnectivityWr.c:42
MEDfileClose
MEDC_EXPORT med_err MEDfileClose(med_idt fid)
Fermeture d'un fichier MED.
Definition: MEDfileClose.c:30
MEDfamilyCr
MEDC_EXPORT med_err MEDfamilyCr(const med_idt fid, const char *const meshname, const char *const familyname, const med_int familynumber, const med_int ngroup, const char *const groupname)
Cette routine permet la création d'une famille portant sur les entités d'un maillage.
Definition: MEDfamilyCr.c:40
MEDmeshCr
MEDC_EXPORT med_err MEDmeshCr(const med_idt fid, const char *const meshname, const med_int spacedim, const med_int meshdim, const med_mesh_type meshtype, const char *const description, const char *const dtunit, const med_sorting_type sortingtype, const med_axis_type axistype, const char *const axisname, const char *const axisunit)
Cette routine permet de créer un maillage dans un fichier.
Definition: MEDmeshCr.c:45
MED_CELL
Definition: med.h:145
MED_NAME_SIZE
#define MED_NAME_SIZE
Definition: med.h:83
MED_CARTESIAN
Definition: med.h:260
med_utils.h
med.h
MED_NO_IT
#define MED_NO_IT
Definition: med.h:323
MEDfileCommentWr
MEDC_EXPORT med_err MEDfileCommentWr(const med_idt fid, const char *const comment)
Ecriture d'un descripteur dans un fichier MED.
Definition: MEDfileCommentWr.c:34
MEDfileOpen
MEDC_EXPORT med_idt MEDfileOpen(const char *const filename, const med_access_mode accessmode)
Ouverture d'un fichier MED.
Definition: MEDfileOpen.c:42
main
int main(int argc, char **argv)
Definition: UsesCase_MEDmesh_1.c:30
MEDmeshNodeCoordinateWr
MEDC_EXPORT med_err MEDmeshNodeCoordinateWr(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_float dt, const med_switch_mode switchmode, const med_int nentity, const med_float *const coordinates)
Cette routine permet d'écrire dans un maillage le tableau des coordonnées des noeuds,...
Definition: MEDmeshNodeCoordinateWr.c:45
MED_ACC_CREAT
Definition: med.h:125
MED_QUAD4
#define MED_QUAD4
Definition: med.h:206
MED_NO_NAME
#define MED_NO_NAME
Definition: med.h:270
MED_NODAL
Definition: med.h:257