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UsesCase_MEDmesh_16.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 with polyhedrons
20 *
21 * Use case 16 : read a 3D unstructured mesh with 2 polyhedrons
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] = "3D Unstructured Mesh With 2 polyhedrons";
33 char meshdescription[MED_COMMENT_SIZE+1];
34 med_int meshdim;
35 med_int spacedim;
36 med_sorting_type sortingtype;
37 med_int nstep;
38 med_mesh_type meshtype;
39 med_axis_type axistype;
40 char axisname[3*MED_SNAME_SIZE+1];
41 char unitname[3*MED_SNAME_SIZE+1];
42 char dtunit[MED_SNAME_SIZE+1];
43 med_float *coordinates = NULL;
44 med_int nnodes = 0;
45 med_int npoly = 0;
46 med_int faceindexsize;
47 med_int nodeindexsize;
48 med_int *faceindex = NULL;
49 med_int *nodeindex = NULL;
50 med_int *connectivity = NULL;
51 med_int connectivitysize;
52 med_bool coordinatechangement;
53 med_bool geotransformation;
54 int i;
55 int k,ind1,ind2;
56 int j, jind1,jind2;
57
58 /* open MED file with READ ONLY access mode */
59 fid = MEDfileOpen("./UsesCase_MEDmesh_15.med",MED_ACC_RDONLY);
60 if (fid < 0) {
61 MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
62 return -1;
63 }
64
65 /*
66 * ... we know that the MED file has only one mesh,
67 * a real code would check ...
68 */
69
70 /* read mesh informations : mesh dimension, space dimension ... */
71 if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription,
72 dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
73 MESSAGE("ERROR : mesh info ...");
74 return -1;
75 }
76
77 /* read how many nodes are in the mesh */
78 if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_POINT1,
79 MED_COORDINATE, MED_NO_CMODE,&coordinatechangement, &geotransformation)) < 0)
80 { MESSAGE("ERROR : number of nodes ...");
81 return -1;
82 }
83
84 /*
85 * ... we know that we only have MED_POLYHEDRON cells in the mesh,
86 * a real code would check for MED geometry cell types ...
87 */
88
89 /* We read how many polyhedrons are in the mesh (using nodal connectivity mode) */
90 /* We get the size of the polyhedrons/face index array.
91 * As an index of the face index array give the location of the first face and so the
92 * number of polyhedrons
93 */
94 if ((faceindexsize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
95 MED_CELL,MED_POLYHEDRON,MED_INDEX_FACE,MED_NODAL,
96 &coordinatechangement, &geotransformation)) < 0)
97 { MESSAGE("ERROR : read number of polyhedrons ...");
98 return -1;
99 }
100 npoly = faceindexsize-1;
101 ISCRUTE(npoly);
102
103 if ((nodeindexsize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
104 MED_CELL,MED_POLYHEDRON,MED_INDEX_NODE,MED_NODAL,
105 &coordinatechangement, &geotransformation)) < 0)
106 { MESSAGE("ERROR : read number of polyhedrons ...");
107 return -1;
108 }
109 ISCRUTE(nodeindexsize);
110
111 /* how many nodes for the polyhedron connectivity ? */
112 if ((connectivitysize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
113 MED_CELL,MED_POLYHEDRON,MED_CONNECTIVITY,MED_NODAL,
114 &coordinatechangement, &geotransformation)) < 0)
115 { MESSAGE("ERROR : read connectivity size ...");
116 return -1;
117 }
118 ISCRUTE(connectivitysize);
119
120 /* read mesh nodes coordinates */
121 if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
122 MESSAGE("ERROR : memory allocation ...");
123 return -1;
124 }
125
126 if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE,
127 coordinates) < 0) {
128 MESSAGE("ERROR : nodes coordinates ...");
129 return -1;
130 }
131 for (i=0;i<nnodes*spacedim;i++)
132 printf("%f - ",*(coordinates+i));
133 printf("\n");
134
135
136 /* read polyhedron connectivity */
137 faceindex = (med_int *) malloc(sizeof(med_int)*faceindexsize);
138 nodeindex = (med_int *) malloc(sizeof(med_int)*nodeindexsize);
139 connectivity = (med_int *) malloc(sizeof(med_int)*connectivitysize);
140
141 if (MEDmeshPolyhedronRd(fid,meshname,MED_NO_DT,MED_NO_IT,MED_CELL,MED_NODAL,
142 faceindex,nodeindex,connectivity) < 0)
143 { MESSAGE("ERROR : read polyhedron connectivity ...");
144 return -1;
145 }
146
147 for (i=0;i<npoly;i++)
148 {
149 printf(">> MED_POLYHEDRON %d : \n",i+1);
150 printf("---- Face Index ----- : [\n");
151 ind1 = *(faceindex+i)-1;
152 ind2 = *(faceindex+i+1)-1;
153 for (k=ind1;k<ind2;k++)
154 printf(IFORMAT" ",*(nodeindex+k));
155 printf(" ] \n");
156 printf("---- Connectivity ----- : [\n");
157 for (k=ind1;k<ind2;k++)
158 {
159 jind1 = *(nodeindex+k)-1;
160 jind2 = *(nodeindex+k+1)-1;
161 for (j=jind1;j<jind2;j++)
162 printf(IFORMAT" ",*(connectivity+j));
163 printf(" \n");
164 }
165 printf(" ] \n");
166 }
167
168 /*
169 * ... we know that the family number of nodes and elements is 0, a real code would check ...
170 */
171
172 /* close MED file */
173 if (MEDfileClose(fid) < 0) {
174 MESSAGE("ERROR : close file");
175 return -1;
176 }
177
178 /* memory deallocation */
179 if (coordinates)
180 free(coordinates);
181
182 if (faceindex)
183 free(faceindex);
184
185 if (nodeindex)
186 free(nodeindex);
187
188 if (connectivity)
189 free(connectivity);
190
191 return 0;
192 }
MED_ACC_RDONLY
Definition: med.h:122
MED_COMMENT_SIZE
#define MED_COMMENT_SIZE
Definition: med.h:81
MED_INDEX_FACE
Definition: med.h:153
MED_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:84
med_idt
hid_t med_idt
Definition: med.h:333
med_sorting_type
med_sorting_type
Definition: med.h:311
MED_INDEX_NODE
Definition: med.h:153
MESSAGE
#define MESSAGE(chaine)
Definition: med_utils.h:324
MED_FULL_INTERLACE
Definition: med.h:98
MEDmeshInfoByName
MEDC_EXPORT med_err MEDmeshInfoByName(const med_idt fid, const char *const meshname, med_int *const spacedim, med_int *const meshdim, med_mesh_type *const meshtype, char *const description, char *const dtunit, med_sorting_type *const sortingtype, med_int *const nstep, med_axis_type *const axistype, char *const axisname, char *const axisunit)
Cette routine permet de lire les informations relatives à un maillage en précisant son nom.
Definition: MEDmeshInfoByName.c:42
med_int
int med_int
Definition: med.h:344
ISCRUTE
#define ISCRUTE(entier)
Definition: med_utils.h:313
med_bool
med_bool
Definition: med.h:262
MEDmeshnEntity
MEDC_EXPORT med_int MEDmeshnEntity(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_data_type datatype, const med_connectivity_mode cmode, med_bool *const changement, med_bool *const transformation)
Cette routine permet de lire le nombre d'entités dans un maillage pour une étape de calcul donnée.
Definition: MEDmeshnEntity.c:44
med_float
double med_float
Definition: med.h:338
MED_COORDINATE
Definition: med.h:151
MED_NO_CMODE
Definition: med.h:257
IFORMAT
#define IFORMAT
Definition: med_utils.h:145
MED_POINT1
#define MED_POINT1
Definition: med.h:200
MED_NO_DT
#define MED_NO_DT
Definition: med.h:322
MEDfileClose
MEDC_EXPORT med_err MEDfileClose(med_idt fid)
Fermeture d'un fichier MED.
Definition: MEDfileClose.c:30
med_mesh_type
med_mesh_type
Definition: med.h:133
MED_CELL
Definition: med.h:145
MED_NAME_SIZE
#define MED_NAME_SIZE
Definition: med.h:83
med_utils.h
MED_NODE
Definition: med.h:145
med_axis_type
med_axis_type
Definition: med.h:260
med.h
MEDmeshPolyhedronRd
MEDC_EXPORT med_err MEDmeshPolyhedronRd(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_connectivity_mode cmode, med_int *const faceindex, med_int *const nodeindex, med_int *const connectivity)
Cette routine permet la lecture dans un maillage des connectivités de polyèdres.
Definition: MEDmeshPolyhedronRd.c:45
MED_CONNECTIVITY
Definition: med.h:151
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
main
int main(int argc, char **argv)
Definition: UsesCase_MEDmesh_16.c:30
MED_POLYHEDRON
#define MED_POLYHEDRON
Definition: med.h:227
MEDmeshNodeCoordinateRd
MEDC_EXPORT med_err MEDmeshNodeCoordinateRd(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_switch_mode switchmode, med_float *const coordinates)
Cette routine permet de lire dans un maillage le tableau des coordonnées des noeuds,...
Definition: MEDmeshNodeCoordinateRd.c:37
MED_NODAL
Definition: med.h:257