usecases/c/UsesCase_MEDmesh_9.c

/*  This file is part of MED.
 *
 *  COPYRIGHT (C) 1999 - 2015  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/>.
 */

/*
 *  How to create an unstructured mesh 
 *
 *  Use case 9 : a 2D unstructured mesh with moving grid
 *  transformation   
 */

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

#include <string.h>

int main (int argc, char **argv) {
  med_idt fid;
  const char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
  const med_int spacedim = 2;
  const med_int meshdim = 2;
  const char axisname[2*MED_SNAME_SIZE+1] = "x               y               ";
  const char unitname[2*MED_SNAME_SIZE+1] = "cm              cm              ";
  const med_float initial_coordinates[30] = { 2.,1.,  7.,1.,  12.,1.,  17.,1.,  22.,1.,
                                              2.,6.,  7.,6.,  12.,6.,  17.,6.,  22.,6.,
                                              2.,11., 7.,11., 12.,11., 17.,11., 22.,11.};
  const med_int nnodes = 15;
  const med_int triaconnectivity[24] = { 1,7,6,   2,7,1,  3,7,2,   8,7,3,   
                                   13,7,8, 12,7,13, 11,7,12, 6,7,11 };
  const med_int ntria3 = 8;
  const med_int quadconnectivity[16] = {3,4,9,8,    4,5,10,9, 
                                        15,14,9,10, 13,8,9,14};
  const med_int nquad4 = 4;
  /* matrix transformation (step 1) : rotation about the Y-axis : 45 degrees */
  const med_float tansfMatrix_step1 [7] = { 0.0, 0.0, 0.0, 0.92388, 0.0, 0.38268, 0.0 };
  /* matrix transformation (step 2) : rotation about the Y-axis : 90 degrees */
  const med_float tansfMatrix_step2 [7] = { 0.0, 0.0, 0.0, 0.707,   0.0, 0.707,   0.0 };
  int ret=-1;
  
  /* open MED file */
  fid = MEDfileOpen("UsesCase_MEDmesh_9.med",MED_ACC_CREAT);
  if (fid < 0) {
    MESSAGE("ERROR : file creation ...");
    goto ERROR;
  }

  /* write a comment in the file */
  if (MEDfileCommentWr(fid,"A 2D unstructured mesh : 15 nodes, 12 cells") < 0) {
    MESSAGE("ERROR : write file description ...");
    goto ERROR;
  }

  /* mesh creation : a 2D unstructured mesh */
  if (MEDmeshCr(fid, meshname, spacedim, meshdim, MED_UNSTRUCTURED_MESH, 
                "A 2D structured mesh","",MED_SORT_DTIT,MED_CARTESIAN, axisname, unitname) < 0) {
    MESSAGE("ERROR : mesh creation ...");
    goto ERROR;
  }

  /* nodes coordinates in a cartesian axis in full interlace mode 
     (X1,Y1, X2,Y2, X3,Y3, ...) with no iteration and computation step 
  */
  if (MEDmeshNodeCoordinateWithProfileWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0,
                                         MED_COMPACT_PFLMODE, MED_NO_PROFILE,
                                         MED_FULL_INTERLACE, MED_ALL_CONSTITUENT,
                                         nnodes, initial_coordinates) < 0) {
    MESSAGE("ERROR : nodes coordinates ...");
    goto ERROR;
  }

  /* cells connectiviy is defined in nodal mode */
  if (MEDmeshElementConnectivityWithProfileWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0,
                                              MED_CELL, MED_TRIA3, MED_NODAL, 
                                              MED_COMPACT_PFLMODE, MED_NO_PROFILE,
                                              MED_FULL_INTERLACE, MED_ALL_CONSTITUENT, 
                                              ntria3, triaconnectivity) < 0) {
    MESSAGE("ERROR : triangular cells connectivity ...");
    goto ERROR;
  }

  if (MEDmeshElementConnectivityWithProfileWr(fid, meshname, MED_NO_DT, MED_NO_IT, 0.0,
                                              MED_CELL, MED_QUAD4, MED_NODAL, 
                                              MED_COMPACT_PFLMODE, MED_NO_PROFILE,
                                              MED_FULL_INTERLACE, MED_ALL_CONSTITUENT,  
                                              nquad4, quadconnectivity) < 0) {
    MESSAGE("ERROR : quadrangular cells connectivity ..."); 
    goto ERROR;
  }

  /* 
   * Mesh deformation (nodes coordinates) in 2 steps 
   * A rotation by step for each node
   */ 
  /* STEP 1 : dt1 = 5.5, it = 1*/
  if ( MEDmeshNodeCoordinateTrsfWr(fid, meshname, 1, 1, 5.5, tansfMatrix_step1) < 0) {
    MESSAGE("Erreur a l'ecriture de la transformation géométrique n°1");
    goto ERROR;
  }

  /* STEP 2 : dt2 = 8.9, it = 1*/
  if ( MEDmeshNodeCoordinateTrsfWr(fid, meshname, 2, 2, 8.9, tansfMatrix_step2 ) < 0) {
    MESSAGE("Erreur a l'ecriture de la transformation géométrique n°1");
    goto ERROR;
  }

  /* create family 0 : by default, all mesh entities family number is 0 */
  if (MEDfamilyCr(fid, meshname,MED_NO_NAME, 0, 0, MED_NO_GROUP) < 0) {
    MESSAGE("ERROR : create family ...");
    goto ERROR;
  }
  
  ret=0;
 ERROR:

  /* close MED file */
  if (MEDfileClose(fid)  < 0) {
    MESSAGE("ERROR : close file ...");
    ret=-1;
  }

  return ret;
}

Généré le Thu Oct 8 14:26:16 2015 pour MED fichier par  doxygen 1.6.1