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UsesCase_MEDmesh_4.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 /*
20  * How to create a structured mesh
21  *
22  * Use case 4 : write a 2D structured mesh (5x3 cartesian grid)
23  */
24 
25 #include <med.h>
26 #define MESGERR 1
27 #include <med_utils.h>
28 
29 #include <string.h>
30 
31 int main (int argc, char **argv) {
32  med_idt fid;
33  const char meshname[MED_NAME_SIZE+1] = "2D structured mesh";
34  const med_int spacedim = 2;
35  const med_int meshdim = 2;
36  const char axisname[2*MED_SNAME_SIZE+1] = "x y ";
37  const char unitname[2*MED_SNAME_SIZE+1] = "cm cm ";
38  med_int axis, size ;
39  const med_float cooXaxis[5] = {1.,2.,3.,4.,5.};
40  const med_float cooYaxis[3] = {1.,2.,3.};
41  const med_int nquad4 = 8;
42  /* 12345678901234561234567890123456123456789012345612345678901234561234567890123456123456789012345612345678901234561234567890123456 */
43  const char cellsnames[8*MED_SNAME_SIZE+1] = "CELL_1 CELL_2 CELL_3 CELL_4 CELL_5 CELL_6 CELL_7 CELL_8 ";
44  const char familyname [MED_NAME_SIZE+1] = "CART_GRID_QUAD_FAMILY";
45  const char groupname [MED_LNAME_SIZE+1] = "CART_GRID_GROUP";
46  const med_int familynumbers[8] = { -1, -1, -1, -1, -1, -1, -1, -1 };
47  int ret=-1;
48 
49  /* MED file creation */
50  fid = MEDfileOpen("UsesCase_MEDmesh_4.med",MED_ACC_CREAT);
51  if (fid < 0) {
52  MESSAGE("ERROR : file creation ...");
53  goto ERROR;
54  }
55 
56  /* create the structured mesh in the MED file */
57  if (MEDmeshCr(fid, meshname, spacedim, meshdim, MED_STRUCTURED_MESH,
58  "A 2D structured mesh","",MED_SORT_DTIT,
59  MED_CARTESIAN, axisname, unitname) < 0) {
60  MESSAGE("ERROR : mesh creation ...");
61  goto ERROR;
62  }
63 
64  /* specify the grid type : MED_CARTESIAN_GRID */
65  if (MEDmeshGridTypeWr(fid,meshname, MED_CARTESIAN_GRID) < 0) {
66  MESSAGE("ERROR : write grid type ...");
67  goto ERROR;
68  }
69 
70  /* write axis "X" and "Y" coordinates */
71  axis = 1;
72  size = 5;
73  if (MEDmeshGridIndexCoordinateWr(fid, meshname, MED_NO_DT, MED_NO_IT,0.0,
74  axis, size, cooXaxis) < 0) {
75  MESSAGE("ERROR : write of axis X coordinates ...");
76  goto ERROR;
77  }
78  axis++;
79  size = 3;
80  if (MEDmeshGridIndexCoordinateWr(fid, meshname, MED_NO_DT, MED_NO_IT,0.0,
81  axis, size, cooYaxis) < 0) {
82  MESSAGE("ERROR : write of axis Y coordinates ...");
83  goto ERROR;
84  }
85 
86  /* optionnal : names for nodes or elements */
87  /* In this case, a name is given to the cells of the mesh */
88  if (MEDmeshEntityNameWr(fid, meshname, MED_NO_DT, MED_NO_IT,
89  MED_CELL, MED_QUAD4, nquad4, cellsnames) < 0) {
90  MESSAGE("ERROR : cells names ...");
91  goto ERROR;
92  }
93 
94  /* We have to create family 0 : by default, all mesh entities family number is 0 */
95  if (MEDfamilyCr(fid, meshname, MED_NO_NAME, 0, 0, MED_NO_GROUP) < 0) {
96  MESSAGE("ERROR : family 0 creation ...");
97  goto ERROR;
98  }
99 
100  /* We decide to create a family for boundary quad4 :
101  by convention a nodes family number is > 0 and an element family number is < 0 */
102  if (MEDfamilyCr(fid, meshname,familyname, 1, -1, groupname) < 0) {
103  MESSAGE("ERROR : family creation ...");
104  goto ERROR;
105  }
106 
107  /* Then we write family number for quad4 */
108  if (MEDmeshEntityFamilyNumberWr(fid, meshname, MED_NO_DT, MED_NO_IT,
109  MED_CELL, MED_QUAD4, nquad4, familynumbers) < 0) {
110  MESSAGE("ERROR : nodes family numbers ...");
111  goto ERROR;
112  }
113 
114  ret = 0;
115  ERROR:
116 
117  /* close MED file */
118  if (MEDfileClose(fid) < 0) {
119  MESSAGE("ERROR : close file ...");
120  ret = -1;
121  }
122 
123  return ret;
124 }
125 
MED_NO_GROUP
#define MED_NO_GROUP
Definition: med.h:291
MED_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:84
med_idt
hid_t med_idt
Definition: med.h:333
MED_STRUCTURED_MESH
Definition: med.h:133
MESSAGE
#define MESSAGE(chaine)
Definition: med_utils.h:324
med_int
int med_int
Definition: med.h:344
MED_SORT_DTIT
Definition: med.h:311
MEDmeshEntityFamilyNumberWr
MEDC_EXPORT med_err MEDmeshEntityFamilyNumberWr(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_geometry_type geotype, const med_int nentity, const med_int *const number)
Cette routine permet l'écriture des numéros de famille d'un type d'entité d'un maillage.
Definition: MEDmeshEntityFamilyNumberWr.c:39
med_float
double med_float
Definition: med.h:338
MED_NO_DT
#define MED_NO_DT
Definition: med.h:322
MEDmeshGridIndexCoordinateWr
MEDC_EXPORT med_err MEDmeshGridIndexCoordinateWr(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_float dt, const med_int axis, const med_int indexsize, const med_float *const gridindex)
Cette routine permet l'écriture des coordonnées des noeuds d'un maillage structuré selon un axe du re...
Definition: MEDmeshGridIndexCoordinateWr.c:43
MEDfileClose
MEDC_EXPORT med_err MEDfileClose(med_idt fid)
Fermeture d'un fichier MED.
Definition: MEDfileClose.c:30
MED_CARTESIAN_GRID
Definition: med.h:139
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_LNAME_SIZE
#define MED_LNAME_SIZE
Definition: med.h:85
MED_NAME_SIZE
#define MED_NAME_SIZE
Definition: med.h:83
MED_CARTESIAN
Definition: med.h:260
med_utils.h
MEDmeshEntityNameWr
MEDC_EXPORT med_err MEDmeshEntityNameWr(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_geometry_type geotype, const med_int nentity, const char *const name)
Cette routine permet d'écrire les noms d'un type d'entité d'un maillage.
Definition: MEDmeshEntityNameWr.c:39
MEDmeshGridTypeWr
MEDC_EXPORT med_err MEDmeshGridTypeWr(const med_idt fid, const char *const meshname, const med_grid_type gridtype)
Cette routine permet de définir le type d'un maillage structuré (MED_STRUCTURED_MESH).
Definition: MEDmeshGridTypeWr.c:37
med.h
MED_NO_IT
#define MED_NO_IT
Definition: med.h:323
MEDfileOpen
MEDC_EXPORT med_idt MEDfileOpen(const char *const filename, const med_access_mode accessmode)
Ouverture d'un fichier MED.
Definition: MEDfileOpen.c:42
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
main
int main(int argc, char **argv)
Definition: UsesCase_MEDmesh_4.c:31