UsesCase_MEDmesh_14.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  *  Use case 14 : read a 2D unstructured mesh with 2 polygons
00020  */
00021 
00022 #include <med.h>
00023 #define MESGERR 1
00024 #include <med_utils.h>
00025 
00026 #include <string.h>
00027 
00028 int main (int argc, char **argv) {
00029   med_idt fid;
00030   const char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
00031   char meshdescription[MED_COMMENT_SIZE+1]="";
00032   med_int meshdim;
00033   med_int spacedim;
00034   med_sorting_type sortingtype;
00035   med_int nstep;
00036   med_mesh_type meshtype;
00037   med_axis_type axistype;
00038   char axisname[2*MED_SNAME_SIZE+1]="";
00039   char unitname[2*MED_SNAME_SIZE+1]="";
00040   char dtunit[MED_SNAME_SIZE+1]="";
00041   med_float *coordinates = NULL;
00042   med_int nnodes = 0;
00043   med_int npoly = 0;
00044   med_int indexsize;
00045   med_int *index = NULL;
00046   med_int *connectivity = NULL;
00047   med_int connectivitysize;
00048   med_bool coordinatechangement;
00049   med_bool geotransformation;
00050   int i;
00051   int k,ind1,ind2;
00052   int ret=-1;
00053 
00054   /* open MED file with READ ONLY access mode */
00055   fid = MEDfileOpen("UsesCase_MEDmesh_13.med",MED_ACC_RDONLY);
00056   if (fid < 0) {
00057     MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
00058     goto ERROR;
00059   }
00060 
00061   /* 
00062    * ... we know that the MED file has only one mesh, 
00063    * a real code working would check ... 
00064    */
00065 
00066   /* read mesh informations : mesh dimension, space dimension ... */
00067   if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription, 
00068                         dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
00069     MESSAGE("ERROR : mesh info ...");
00070     goto ERROR;
00071   }
00072 
00073   /* read how many nodes in the mesh */
00074   if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_POINT1,
00075                                MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
00076                                &geotransformation)) < 0) {
00077     MESSAGE("ERROR : number of nodes ...");
00078     goto ERROR;
00079   }
00080   
00081   /* 
00082    * ... we know that we only have MED_POLYGON celles in the mesh, 
00083    * a real code working would check all MED geometry cell types ... 
00084    */
00085 
00086   /* How many polygon in the mesh in nodal connectivity mode */
00087   /* For the polygons, we get the size of array index */
00088   if ((indexsize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
00089                                   MED_CELL,MED_POLYGON,MED_INDEX_NODE,MED_NODAL,
00090                                   &coordinatechangement,
00091                                   &geotransformation)) < 0) {
00092     MESSAGE("ERROR : read number of polygon ...");
00093     goto ERROR;
00094   }
00095   npoly = indexsize-1;
00096 
00097   /* how many nodes for the polygon connectivity ? */
00098   if ((connectivitysize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
00099                                          MED_CELL,MED_POLYGON,MED_CONNECTIVITY,MED_NODAL,
00100                                          &coordinatechangement,
00101                                          &geotransformation)) < 0) {
00102     MESSAGE("ERROR : read connevity size ...");
00103     goto ERROR;
00104     }
00105 
00106   /* read mesh nodes coordinates */
00107   if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
00108     MESSAGE("ERROR : memory allocation ...");
00109     goto ERROR;
00110   }
00111 
00112   if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE,
00113                               coordinates) < 0) {
00114     MESSAGE("ERROR : nodes coordinates ...");
00115     free(coordinates);
00116     goto ERROR;
00117   }
00118   free(coordinates);
00119 
00120   /* read polygons connectivity */
00121   index = (med_int *) malloc(sizeof(med_int)*indexsize);
00122   connectivity = (med_int *) malloc(sizeof(med_int)*connectivitysize);
00123 
00124   if (MEDmeshPolygonRd(fid,meshname,MED_NO_DT,MED_NO_IT,MED_CELL,MED_NODAL,
00125                        index,connectivity) < 0) {
00126     MESSAGE("ERROR : read polygon connectivity ...");
00127     free(index);
00128     free(connectivity);
00129     goto ERROR;
00130   }
00131   free(index);
00132   free(connectivity);
00133   
00134   /* 
00135    * ... we know that the family number of nodes and elements is 0, a real working would check ...
00136    */
00137 
00138   ret=0;
00139  ERROR:
00140 
00141   /* close MED file */
00142   if (MEDfileClose(fid) < 0) {
00143     MESSAGE("ERROR : close file");             
00144     ret=-1; 
00145   } 
00146 
00147   return ret;
00148 }
00149 

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