# UsesCase_MEDmesh_1.c

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    00001 /*  This file is part of MED.
    00002  *
    00003  *  COPYRIGHT (C) 1999 - 2011  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
    00020  *
    00021  *  Use case 1 : a 2D unstructured mesh with 15 nodes, 8 triangular cells, 4 triangular cells
    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 unstructured mesh";
    00033   const med_int spacedim = 2;
    00034   const med_int meshdim = 2;
    00035   /*                                         12345678901234561234567890123456 */
    00036   const char axisname[2*MED_SNAME_SIZE+1] = "x               y               ";
    00037   const char unitname[2*MED_SNAME_SIZE+1] = "cm              cm              ";
    00038   const med_float coordinates[30] = { 2.,1.,  7.,1.,  12.,1.,  17.,1.,  22.,1.,
    00039                                       2.,6.,  7.,6.,  12.,6.,  17.,6.,  22.,6.,
    00040                                       2.,11., 7.,11., 12.,11., 17.,11., 22.,11.};
    00041   const med_int nnodes = 15;
    00042   const med_int triaconnectivity[24] = { 1,7,6,   2,7,1,  3,7,2,   8,7,3,
    00043                                          13,7,8, 12,7,13, 11,7,12, 6,7,11 };
    00044   const med_int ntria3 = 8;
    00045   const med_int quadconnectivity[16] = {3,4,9,8,    4,5,10,9,
    00046                                         15,14,9,10, 13,8,9,14};
    00047   const med_int nquad4 = 4;
    00048   med_err ret=-1;
    00049
    00050   /* open MED file */
    00051   fid = MEDfileOpen("UsesCase_MEDmesh_1.med",MED_ACC_CREAT);
    00052   if (fid < 0) {
    00053     MESSAGE("ERROR : file creation ...");
    00054     goto ERROR;
    00055   }
    00056
    00057   /* write a comment in the file */
    00058   if (MEDfileCommentWr(fid,"A 2D unstructured mesh : 15 nodes, 12 cells") < 0) {
    00059     MESSAGE("ERROR : write file description ...");
    00060     goto ERROR;
    00061   }
    00062
    00063   /* mesh creation : a 2D unstructured mesh */
    00064   if (MEDmeshCr(fid, meshname, spacedim, meshdim, MED_UNSTRUCTURED_MESH,
    00065                 "A 2D unstructured mesh","",MED_SORT_DTIT,MED_CARTESIAN, axisname, unitname) < 0) {
    00066     MESSAGE("ERROR : mesh creation ...");
    00067     goto ERROR;
    00068   }
    00069
    00070   /* nodes coordinates in a cartesian axis in full interlace mode
    00071      (X1,Y1, X2,Y2, X3,Y3, ...) with no iteration and computation step
    00072   */
    00073   if (MEDmeshNodeCoordinateWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0,
    00074                               MED_FULL_INTERLACE, nnodes, coordinates) < 0) {
    00075     MESSAGE("ERROR : nodes coordinates ...");
    00076     goto ERROR;
    00077   }
    00078
    00079   /* cells connectiviy is defined in nodal mode with no iteration and computation step */
    00080   if (MEDmeshElementConnectivityWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0, MED_CELL, MED_TRIA3,
    00081                                    MED_NODAL, MED_FULL_INTERLACE, ntria3, triaconnectivity) < 0) {
    00082     MESSAGE("ERROR : triangular cells connectivity ...");
    00083     goto ERROR;
    00084   }
    00085   if (MEDmeshElementConnectivityWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0, MED_CELL, MED_QUAD4,
    00086                                    MED_NODAL, MED_FULL_INTERLACE, nquad4, quadconnectivity) < 0) {
    00087     MESSAGE("ERROR : quadrangular cells connectivity ...");
    00088     goto ERROR;
    00089   }
    00090
    00091   /* create family 0 : by default, all mesh entities family number is 0 */
    00092   if (MEDfamilyCr(fid, meshname,MED_NO_NAME, 0, 0, MED_NO_GROUP) < 0) {
    00093     MESSAGE("ERROR : family 0 creation ...");
    00094     goto ERROR;
    00095   }
    00096
    00097   ret = 0;
    00098  ERROR :
    00099
    00100   /* close MED file */
    00101   if (MEDfileClose(fid)  < 0) {
    00102     MESSAGE("ERROR : close file ...");
    00103     return -1;
    00104   }
    00105
    00106   return ret;
    00107 }