MED fichier: usecases/c/UsesCase_MEDmesh_16.c

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usecases/c/UsesCase_MEDmesh_16.c
/* This file is part of MED.
*
* COPYRIGHT (C) 1999 - 2019 EDF R&D, CEA/DEN
* MED is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MED is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with MED. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* How to create an unstructured mesh with polyhedrons
*
* Use case 16 : read a 3D unstructured mesh with 2 polyhedrons
*/
#include <med.h>
#define MESGERR 1
#include <med_utils.h>
#include <string.h>
int main (int argc, char **argv) {
med_idt fid;
const char meshname[MED_NAME_SIZE+1] = "3D Unstructured Mesh With 2 polyhedrons";
char meshdescription[MED_COMMENT_SIZE+1];
med_int meshdim;
med_int spacedim;
med_sorting_type sortingtype;
med_int nstep;
med_mesh_type meshtype;
med_axis_type axistype;
char axisname[3*MED_SNAME_SIZE+1];
char unitname[3*MED_SNAME_SIZE+1];
char dtunit[MED_SNAME_SIZE+1];
med_float *coordinates = NULL;
med_int nnodes = 0;
med_int npoly = 0;
med_int faceindexsize;
med_int nodeindexsize;
med_int *faceindex = NULL;
med_int *nodeindex = NULL;
med_int *connectivity = NULL;
med_int connectivitysize;
med_bool coordinatechangement;
med_bool geotransformation;
int i;
int k,ind1,ind2;
int j, jind1,jind2;
/* open MED file with READ ONLY access mode */
fid = MEDfileOpen("./UsesCase_MEDmesh_15.med",MED_ACC_RDONLY);
if (fid < 0) {
MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
return -1;
}
/*
* ... we know that the MED file has only one mesh,
* a real code would check ...
*/
/* read mesh informations : mesh dimension, space dimension ... */
if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription,
dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
MESSAGE("ERROR : mesh info ...");
return -1;
}
/* read how many nodes are in the mesh */
if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_POINT1,
MED_COORDINATE, MED_NO_CMODE,&coordinatechangement, &geotransformation)) < 0)
{ MESSAGE("ERROR : number of nodes ...");
return -1;
}
/*
* ... we know that we only have MED_POLYHEDRON cells in the mesh,
* a real code would check for MED geometry cell types ...
*/
/* We read how many polyhedrons are in the mesh (using nodal connectivity mode) */
/* We get the size of the polyhedrons/face index array.
* As an index of the face index array give the location of the first face and so the
* number of polyhedrons
*/
if ((faceindexsize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
MED_CELL, MED_POLYHEDRON, MED_INDEX_FACE, MED_NODAL,
&coordinatechangement, &geotransformation)) < 0)
{ MESSAGE("ERROR : read number of polyhedrons ...");
return -1;
}
npoly = faceindexsize-1;
ISCRUTE(npoly);
if ((nodeindexsize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
MED_CELL,MED_POLYHEDRON, MED_INDEX_NODE,MED_NODAL,
&coordinatechangement, &geotransformation)) < 0)
{ MESSAGE("ERROR : read number of polyhedrons ...");
return -1;
}
ISCRUTE(nodeindexsize);
/* how many nodes for the polyhedron connectivity ? */
if ((connectivitysize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
MED_CELL,MED_POLYHEDRON, MED_CONNECTIVITY,MED_NODAL,
&coordinatechangement, &geotransformation)) < 0)
{ MESSAGE("ERROR : read connectivity size ...");
return -1;
}
ISCRUTE(connectivitysize);
/* read mesh nodes coordinates */
if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
MESSAGE("ERROR : memory allocation ...");
return -1;
}
if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE,
coordinates) < 0) {
MESSAGE("ERROR : nodes coordinates ...");
return -1;
}
for (i=0;i<nnodes*spacedim;i++)
printf("%f - ",*(coordinates+i));
printf("\n");
/* read polyhedron connectivity */
faceindex = (med_int *) malloc(sizeof(med_int)*faceindexsize);
nodeindex = (med_int *) malloc(sizeof(med_int)*nodeindexsize);
connectivity = (med_int *) malloc(sizeof(med_int)*connectivitysize);
if (MEDmeshPolyhedronRd(fid,meshname,MED_NO_DT,MED_NO_IT,MED_CELL,MED_NODAL,
faceindex,nodeindex,connectivity) < 0)
{ MESSAGE("ERROR : read polyhedron connectivity ...");
return -1;
}
for (i=0;i<npoly;i++)
{
printf(">> MED_POLYHEDRON "IFORMAT" : \n",i+1);
printf("---- Face Index ----- : [\n");
ind1 = *(faceindex+i)-1;
ind2 = *(faceindex+i+1)-1;
for (k=ind1;k<ind2;k++)
printf(IFORMAT" ",*(nodeindex+k));
printf(" ] \n");
printf("---- Connectivity ----- : [\n");
for (k=ind1;k<ind2;k++)
{
jind1 = *(nodeindex+k)-1;
jind2 = *(nodeindex+k+1)-1;
for (j=jind1;j<jind2;j++)
printf(IFORMAT" ",*(connectivity+j));
printf(" \n");
}
printf(" ] \n");
}
/*
* ... we know that the family number of nodes and elements is 0, a real code would check ...
*/
/* close MED file */
if (MEDfileClose(fid) < 0) {
MESSAGE("ERROR : close file");
return -1;
}
/* memory deallocation */
if (coordinates)
free(coordinates);
if (faceindex)
free(faceindex);
if (nodeindex)
free(nodeindex);
if (connectivity)
free(connectivity);
return 0;
}