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UsesCase_MEDmesh_1.c
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1 /* This file is part of MED.
2 *
3 * COPYRIGHT (C) 1999 - 2021 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 */
80 if (MEDmeshElementConnectivityWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0, MED_CELL, MED_TRIA3,
81 MED_NODAL, MED_FULL_INTERLACE, ntria3, triaconnectivity) < 0) {
82 MESSAGE("ERROR : triangular cells connectivity ...");
83 goto ERROR;
84 }
85 if (MEDmeshElementConnectivityWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0, MED_CELL, MED_QUAD4,
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_CARTESIAN
Definition: med.h:258
MED_NO_GROUP
#define MED_NO_GROUP
Definition: med.h:289
MED_TRIA3
#define MED_TRIA3
Definition: med.h:203
MED_FULL_INTERLACE
Definition: med.h:96
MED_SORT_DTIT
Definition: med.h:309
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
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_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:82
MED_NODAL
Definition: med.h:255
med_idt
hid_t med_idt
Definition: med.h:331
med_err
herr_t med_err
Definition: med.h:332
MED_CELL
Definition: med.h:143
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
MESSAGE
#define MESSAGE(chaine)
Definition: med_utils.h:324
med_int
int med_int
Definition: med.h:342
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
med.h
med_float
double med_float
Definition: med.h:336
MED_NO_DT
#define MED_NO_DT
Definition: med.h:320
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:123
MED_NAME_SIZE
#define MED_NAME_SIZE
Definition: med.h:81
MED_UNSTRUCTURED_MESH
Definition: med.h:131
MEDfileClose
MEDC_EXPORT med_err MEDfileClose(med_idt fid)
Fermeture d'un fichier MED.
Definition: MEDfileClose.c:30
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
MED_NO_IT
#define MED_NO_IT
Definition: med.h:321
main
int main(int argc, char **argv)
Definition: UsesCase_MEDmesh_1.c:30
med_utils.h
MED_QUAD4
#define MED_QUAD4
Definition: med.h:204
MED_NO_NAME
#define MED_NO_NAME
Definition: med.h:268