UsesCase_MEDmesh_5.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  * Mesh Use case 5 : read a 2D structured mesh
00020  *                   5x3 cartesian grid
00021  * 
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]="2D structured mesh";
00033   med_int spacedim;
00034   med_int meshdim;
00035   char meshdescription[MED_COMMENT_SIZE+1];
00036   char axisname[2*MED_SNAME_SIZE+1];
00037   char unitname[2*MED_SNAME_SIZE+1];
00038   char dtunit[MED_SNAME_SIZE+1];
00039   med_mesh_type meshtype;
00040   med_axis_type axistype;
00041   med_grid_type gridtype;
00042   med_int axis, size ;
00043   med_float *cooXaxis = NULL;
00044   med_float *cooYaxis = NULL;
00045   med_bool coordinatechangement;
00046   med_bool geotransformation;
00047   med_int nstep;
00048   med_sorting_type sortingtype;
00049   int j;
00050   int ret=-1;
00051   int ncell=0;
00052   char *cellsname=NULL;
00053 
00054   /* open MED file */
00055   fid = MEDfileOpen("UsesCase_MEDmesh_4.med",MED_ACC_RDONLY);
00056   if (fid < 0) {
00057     MESSAGE("ERROR : open file ...");
00058     goto ERROR;
00059   }
00060 
00061   /* read mesh informations : meshname, mesh dimension, space dimension ... */
00062   if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription, 
00063                         dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
00064     MESSAGE("ERROR : mesh info ...");
00065     goto ERROR;
00066   }
00067   
00068   /* read the grid type : MED_CARTESIAN_GRID or MED_CURVILINEAR_GRID */
00069   if (MEDmeshGridTypeRd(fid, meshname, &gridtype) < 0) {
00070     MESSAGE("ERROR : read grid type ...");
00071   }
00072 
00073   /* 
00074    * ... we know that we the mesh is a cartesian grid, 
00075    * a real code working would check  ... 
00076    */
00077 
00078   /* read the axis coordinates (MED_CARTESIAN coordinates system */
00079   /* X */
00080   axis = 1;
00081   if ((size = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, 
00082                              MED_NODE, MED_NONE, MED_COORDINATE_AXIS1, MED_NO_CMODE,
00083                              &coordinatechangement, &geotransformation)) < 0) {
00084     MESSAGE("ERROR : number of coordinates on X axis ...");
00085     goto ERROR;
00086   }
00087   ncell = size-1;
00088 
00089   if ((cooXaxis = (med_float *) malloc(sizeof(med_float)*size)) == NULL) {
00090     MESSAGE("ERROR : memory allocation ...");
00091     goto ERROR;
00092   }
00093   if (MEDmeshGridIndexCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, 
00094                                    axis, cooXaxis) < 0) {
00095     MESSAGE("ERROR : read axis X coordinates ...");
00096     free(cooXaxis);
00097     goto ERROR;
00098   }  
00099   
00100   free(cooXaxis);
00101 
00102   /* Y */
00103   axis = 2; 
00104   if ((size = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, 
00105                              MED_NODE, MED_NONE, MED_COORDINATE_AXIS2, MED_NO_CMODE,
00106                              &coordinatechangement, &geotransformation)) < 0) {
00107     MESSAGE("ERROR : number of coordinates on Y axis ...");
00108     goto ERROR;
00109   }
00110   ncell = ncell * (size-1);
00111 
00112   if ((cooYaxis = (med_float *) malloc(sizeof(med_float)*size)) == NULL) {
00113     MESSAGE("ERROR : memory allocation ...");
00114     goto ERROR;
00115   }
00116   if (MEDmeshGridIndexCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, 
00117                                    axis, cooYaxis) < 0) {
00118     MESSAGE("ERROR : read axis Y coordinates ...");
00119     free(cooYaxis); 
00120     goto ERROR;
00121   }
00122 
00123   free(cooYaxis);   
00124 
00125   cellsname = (char *) malloc((sizeof(char))*ncell*MED_SNAME_SIZE+1);
00126   if (MEDmeshEntityNameRd(fid, meshname, MED_NO_DT, MED_NO_IT, 
00127                           MED_CELL, MED_QUAD4, cellsname) < 0)  {
00128     MESSAGE("ERROR : read cells name ...");
00129     free(cellsname); 
00130     goto ERROR;
00131   } 
00132   free(cellsname);
00133 
00134   ret=0;
00135  ERROR:
00136  
00137   /* close MED file */
00138   if (MEDfileClose(fid) < 0) {
00139     MESSAGE("ERROR : close file ...");             
00140     ret = -1; 
00141   }
00142 
00143   return ret;
00144 }

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