# c/test28.c

    /*  This file is part of MED.
     *
     *  COPYRIGHT (C) 1999 - 2012  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/>.
     */

    /******************************************************************************
     * - Nom du fichier : test28.c
     *
     * - Description : lecture d'un maillage structure (grille cartesienne |
     *                 grille polaire) dans le fichier test27.med
     *
     *****************************************************************************/

    #include <med.h>
    #define MESGERR 1
    #include "med_utils.h"
    #include <string.h>

    #ifdef DEF_LECT_ECR
    #define MODE_ACCES MED_ACC_RDWR
    #elif DEF_LECT_AJOUT
    #define MODE_ACCES MED_ACC_RDEXT
    #else
    #define MODE_ACCES MED_ACC_CREAT
    #endif

    #define MAXDIM 3

    int main (int argc, char **argv)

    {
      med_err    ret = 0;
      med_idt    fid = 0;
      med_int    mdim= 0, sdim=0, axe=0, j=0;
      med_float *indices=NULL;
      med_int    nind=0,nmaa=0, nnoeuds=0;
      med_bool   chgt=MED_FALSE,trsf=MED_FALSE;
      char maa     [MED_NAME_SIZE+1]        ="";
      char axisname[MAXDIM*MED_SNAME_SIZE+1]="";
      char axisunit[MAXDIM*MED_SNAME_SIZE+1]="";
      char dtunit[MED_SNAME_SIZE+1]="";
      char desc[MED_COMMENT_SIZE+1]="";
      med_mesh_type    meshtype;
      med_grid_type    gridtype;
      med_data_type    quoi;
      med_sorting_type sort;
      med_axis_type    repere;
      med_float *coo;
      med_int   *structure_grille;
      med_int nstep=0,i=0;

      /* Ouverture du fichier test17.med en lecture seule */
      fid = MEDfileOpen("test27.med",MED_ACC_RDONLY);
      if (fid < 0) {
        MESSAGE("Erreur a l'ouverture du fichier test27.med");
        return -1;
      }

      /* Lecture du nombre de maillage */
      nmaa = MEDnMesh(fid);
      if (nmaa < 0) {
        MESSAGE("Erreur a la lecture du nombre de maillage");
        return -1;
      }

      /* On boucle sur les maillages et on ne lit que la grille cartesienne
         et la grille destructuree */
      for (i=0;i<nmaa;i++) {

        if ((sdim=MEDmeshnAxis(fid, i+1)) <0) {
          MESSAGE("Erreur a la lecture de la dimension de l'espace du maillage :");
          SSCRUTE(maa);
          return -1;
        }

        /* On repere le maillage qui nous interesse */
        if ( MEDmeshInfo( fid, i+1,  maa, &sdim, &mdim, &meshtype, desc, dtunit, &sort,
                          &nstep,  &repere, axisname,axisunit) < 0 ) {
          MESSAGE("Erreur a la lecture des infos sur le maillage");
          return -1;
        }

        printf("\nMaillage de nom : |%s| , de dimension : "IFORMAT" , et de type %d\n",maa,mdim,meshtype);
        printf("\t -Dimension de l'espace : "IFORMAT"\n",sdim);
        printf("\t -Description du maillage : |%s|\n",desc);
        printf("\t -Noms des axes : |%s|\n",axisname);
        printf("\t -Unités des axes : |%s|\n",axisunit);
        printf("\t -Type de repère : %d\n",repere);
        printf("\t -Nombre d'étapes de calcul : "IFORMAT"\n",nstep);
        printf("\t -Unité des dates : |%s|\n",dtunit);
        if (meshtype == MED_STRUCTURED_MESH)
          printf("\t - Type : Maillage structure \n");
        else
          printf("\t - Type : Maillage non structure \n");

        /* On regarde le type de la grille */
        if (meshtype == MED_STRUCTURED_MESH) {
          if (MEDmeshGridTypeRd(fid,maa, &gridtype) < 0) {
            MESSAGE("Erreur a la lecture de la nature d'une grille");
            return -1;
          }
          if (gridtype == MED_CARTESIAN_GRID)
            printf("\t - Grille cartesienne \n");
          if (gridtype == MED_CURVILINEAR_GRID)
            printf("\t - Grille de-structureee \n");
        }

        /* On regarde les coordonnees de la grille standard */
        if (meshtype == MED_STRUCTURED_MESH && gridtype == MED_CURVILINEAR_GRID) {

          nnoeuds = MEDmeshnEntity(fid, maa, MED_NO_DT, MED_NO_IT,
                                   MED_NODE, MED_NONE, MED_COORDINATE, MED_NO_CMODE, &chgt, &trsf);
          if (nnoeuds < 0) {
            MESSAGE("Erreur a la lecture du nombre de noeuds");
            return -1;
          }
          printf("Nombre de noeuds : "IFORMAT" \n",nnoeuds);

          structure_grille = (med_int *) malloc(sizeof(med_int)*mdim);
          if ( MEDmeshGridStructRd(fid,maa,MED_NO_DT,MED_NO_IT, structure_grille ) < 0) {
            MESSAGE("Erreur a la lecture de la structure de la grille");
            ret = -1;
          }
          if (ret == 0) {
            printf("Structure des noeuds de la grille : [ ");
            for (j=0;j<mdim;j++)
              printf(" "IFORMAT" ",*(structure_grille+j));
            printf(" ] \n");
            free(structure_grille);
          }

          if (ret == 0) {
            coo = (med_float *) malloc(sizeof(med_float)*nnoeuds*mdim);

            if ( MEDmeshNodeCoordinateRd(fid, maa, MED_NO_DT, MED_NO_IT,
                                         MED_FULL_INTERLACE, coo) < 0 ) {
              MESSAGE("Erreur a la lecture des coordonnees des noeuds");
              ret = -1;
            }
          }

          if (ret == 0) {
            printf("Coordonnees : [ ");
            for (j=0;j<nnoeuds*mdim;j++)  printf(" %f ",*(coo+j));
            printf(" ] \n");
            free(coo);
          }
        }

        /* On regarde les coordonnees des indices de la grille cartesienne */
        if (meshtype == MED_STRUCTURED_MESH && gridtype == MED_CARTESIAN_GRID)
          for (axe=1;axe<=mdim;axe++) {
            switch(axe) {
            case 1 :
              quoi = MED_COORDINATE_AXIS1;
              break;

            case 2 :
              quoi = MED_COORDINATE_AXIS2;
              break;

            case 3 :
              quoi = MED_COORDINATE_AXIS3;
              break;

            default :
              return -1;
            }

            nind = MEDmeshnEntity(fid, maa, MED_NO_DT, MED_NO_IT,
                                  MED_NODE, MED_NONE, quoi, MED_NO_CMODE, &chgt, &trsf);
            if (nind < 0) {
              MESSAGE("Erreur a la lecture de la taille de l'indice");
              return -1;
            }
            printf("Lecture de la taille de l'indice : "IFORMAT" \n",nind);

            /* on lit le tableau des indices */
            indices = (med_float *) malloc(sizeof(med_float)*nind);
            if (MEDmeshGridIndexCoordinateRd(fid,maa,MED_NO_DT,MED_NO_IT, axe,indices) < 0) {
              MESSAGE("Erreur a lecture de indices de coordonnees");
              ret = -1;
            }
            if (ret == 0) {
              printf("Axe %.*s [%.*s] : [ ",MED_SNAME_SIZE, &axisname[(axe-1)*MED_SNAME_SIZE],
                     MED_SNAME_SIZE,&axisunit[(axe-1)*MED_SNAME_SIZE]);
              for (j=0;j<nind;j++) printf(" %f ",indices[j]);
              printf(" ] \n");
            }
            free(indices);
          }
      }

      /* On ferme le fichier */
      if (MEDfileClose(fid) < 0) {
        MESSAGE("Erreur a la fermeture du fichier");
        return -1;
      }
      printf("Fermeture du fichier \n");

      return ret;
    }