UsesCase_MEDmesh_16.c

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00001 /*  This file is part of MED.
00002  *
00003  *  COPYRIGHT (C) 1999 - 2015  EDF R&D, CEA/DEN
00004  *  MED is free software: you can redistribute it and/or modify
00005  *  it under the terms of the GNU Lesser General Public License as published by
00006  *  the Free Software Foundation, either version 3 of the License, or
00007  *  (at your option) any later version.
00008  *
00009  *  MED is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *  GNU Lesser General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU Lesser General Public License
00015  *  along with MED.  If not, see <http://www.gnu.org/licenses/>.
00016  */
00017 
00018 /*
00019  *  How to create an unstructured mesh with polygons
00020  *
00021  *  Use case 16 : read a 2D unstructured mesh with 2 polyhedrons
00022  */
00023 
00024 #include <med.h>
00025 #define MESGERR 1
00026 #include <med_utils.h>
00027 
00028 #include <string.h>
00029 
00030 int main (int argc, char **argv) {
00031   med_idt fid;
00032   const char meshname[MED_NAME_SIZE+1] = "3D unstructured mesh";
00033   char meshdescription[MED_COMMENT_SIZE+1];
00034   med_int meshdim;
00035   med_int spacedim;
00036   med_sorting_type sortingtype;
00037   med_int nstep;
00038   med_mesh_type meshtype;
00039   med_axis_type axistype;
00040   char axisname[3*MED_SNAME_SIZE+1];
00041   char unitname[3*MED_SNAME_SIZE+1];
00042   char dtunit[MED_SNAME_SIZE+1];
00043   med_float *coordinates = NULL;
00044   med_int nnodes = 0;
00045   med_int npoly = 0;
00046   med_int indexsize;
00047   med_int faceIndexSize;
00048   med_int *index = NULL;
00049   med_int *faceindex = NULL;
00050   med_int *connectivity = NULL;
00051   med_int connectivitysize;
00052   med_bool coordinatechangement;
00053   med_bool geotransformation;
00054   int i;
00055   int k,ind1,ind2;
00056   int j, jind1,jind2;
00057 
00058   /* open MED file with READ ONLY access mode */
00059   fid = MEDfileOpen("./UsesCase_MEDmesh_15.med",MED_ACC_RDONLY);
00060   if (fid < 0) {
00061     MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
00062     return -1;
00063   }
00064 
00065   /*
00066    * ... we know that the MED file has only one mesh,
00067    * a real code working would check ...
00068    */
00069 
00070   /* read mesh informations : mesh dimension, space dimension ... */
00071   if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription,
00072       dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
00073     MESSAGE("ERROR : mesh info ...");
00074     return -1;
00075   }
00076 
00077   /* read how many nodes in the mesh */
00078   if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_POINT1,
00079              MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
00080              &geotransformation)) < 0) {
00081     MESSAGE("ERROR : number of nodes ...");
00082     return -1;
00083   }
00084 
00085   /*
00086    * ... we know that we only have MED_POLYHEDRON cells in the mesh,
00087    * a real code working would check all MED geometry cell types ...
00088    */
00089 
00090   /* How many polygon in the mesh in nodal connectivity mode */
00091   /* For the polygons, we get the size of array index */
00092   if ((indexsize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
00093           MED_CELL,MED_POLYHEDRON,MED_INDEX_FACE,MED_NODAL,
00094           &coordinatechangement,
00095           &geotransformation)) < 0) {
00096     MESSAGE("ERROR : read number of polyedron ...");
00097     return -1;
00098   }
00099   npoly = indexsize-1;
00100   ISCRUTE(npoly);
00101 
00102   if ((faceIndexSize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
00103           MED_CELL,MED_POLYHEDRON,MED_INDEX_NODE,MED_NODAL,
00104           &coordinatechangement,
00105           &geotransformation)) < 0) {
00106     MESSAGE("ERROR : read number of polyedron ...");
00107     return -1;
00108   }
00109   ISCRUTE(faceIndexSize);
00110 
00111   /* how many nodes for the polyhedron connectivity ? */
00112   if ((connectivitysize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
00113            MED_CELL,MED_POLYHEDRON,MED_CONNECTIVITY,MED_NODAL,
00114            &coordinatechangement,
00115            &geotransformation)) < 0) {
00116     MESSAGE("ERROR : read connevity size ...");
00117     return -1;
00118     }
00119   ISCRUTE(connectivitysize);
00120 
00121   /* read mesh nodes coordinates */
00122   if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
00123     MESSAGE("ERROR : memory allocation ...");
00124     return -1;
00125   }
00126 
00127   if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE,
00128             coordinates) < 0) {
00129     MESSAGE("ERROR : nodes coordinates ...");
00130     return -1;
00131   }
00132   for (i=0;i<nnodes*spacedim;i++)
00133     printf("%f - ",*(coordinates+i));
00134   printf("\n");
00135 
00136 
00137   /* read polygons connectivity */
00138   index = (med_int *) malloc(sizeof(med_int)*indexsize);
00139   faceindex = (med_int *) malloc(sizeof(med_int)*faceIndexSize);
00140   connectivity = (med_int *) malloc(sizeof(med_int)*connectivitysize);
00141 
00142   if (MEDmeshPolyhedronRd(fid,meshname,MED_NO_DT,MED_NO_IT,MED_CELL,MED_NODAL,
00143                           index,faceindex,connectivity) < 0) {
00144     MESSAGE("ERROR : read polygon connectivity ...");
00145     return -1;
00146   }
00147 
00148   for (i=0;i<npoly;i++)
00149     {
00150     printf(">> MED_POLYHEDRON "IFORMAT" : \n",i+1);
00151     printf("---- Face Index         ----- : [ ");
00152     ind1 = *(index+i)-1;
00153     ind2 = *(index+i+1)-1;
00154     for (k=ind1;k<ind2;k++)
00155       printf(IFORMAT" ",*(faceindex+k));
00156     printf(" ] \n");
00157     printf("---- Connectivity       ----- : [ ");
00158     for (k=ind1;k<ind2;k++)
00159       {
00160       jind1 = *(faceindex+k)-1;
00161       jind2 = *(faceindex+k+1)-1;
00162       for (j=jind1;j<jind2;j++)
00163         printf(IFORMAT" ",*(connectivity+j));
00164       printf(" \n");
00165       }
00166     printf(" ] \n");
00167     }
00168 
00169   /*
00170    * ... we know that the family number of nodes and elements is 0, a real working would check ...
00171    */
00172 
00173   /* close MED file */
00174   if (MEDfileClose(fid) < 0) {
00175     MESSAGE("ERROR : close file");
00176     return -1;
00177   }
00178 
00179   /* memory deallocation */
00180   if (coordinates)
00181     free(coordinates);
00182 
00183   if (index)
00184     free(index);
00185 
00186   if (faceindex)
00187     free(faceindex);
00188 
00189   if (connectivity)
00190     free(connectivity);
00191 
00192   return 0;
00193 }

Généré le Thu Oct 8 14:26:17 2015 pour MED fichier par  doxygen 1.6.1