/* nag_mesh2d_inc (d06aac) Example Program.
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001.
 */

#include <stdio.h>
#include <nag.h>
#include <nagx04.h>
#include <nag_stdlib.h>
#include <nagd06.h>

#define EDGE(I, J) edge[3*((J) -1)+(I) -1]
#define CONN(I, J) conn[3*((J) -1)+(I) -1]
#define COOR(I, J) coor[2*((J) -1)+(I) -1]

int main(int argc, char *argv[])
{
  FILE          *fpin, *fpout;
  const Integer nvmax = 250;
  double        coef, power;
  Integer       exit_status, i1, i, itrace, k,
                nedge, nelt, nv, nvb, reftk;
  Nag_Boolean   smooth;
  NagError      fail;
  char          pmesh[2];
  double        *bspace = 0, *coor = 0;
  Integer       *conn = 0, *edge = 0;

  INIT_FAIL(fail);

  /* Check for command-line IO options */
  fpin = nag_example_file_io(argc, argv, "-data", NULL);
  fpout = nag_example_file_io(argc, argv, "-results", NULL);
  exit_status = 0;

  fprintf(fpout, "nag_mesh2d_inc (d06aac) Example Program Results\n\n");

  /* Skip heading in data file */

  fscanf(fpin, "%*[^\n] ");

  /* Reading of the geometry */

  fscanf(fpin, "%ld%ld%*[^\n] ", &nvb, &nedge);

  if (nvb > nvmax)
    {
      fprintf(fpout, "Problem with the array dimensions\n");
      fprintf(fpout, " nvb nvmax %6ld%6ld\n", nvb, nvmax);
      fprintf(fpout, " Please increase the value of nvmax\n");
      exit_status = -1;
      goto END;
    }

  /* Allocate memory */

  if (!(bspace = NAG_ALLOC(nvb, double)) ||
      !(coor = NAG_ALLOC(2*nvmax, double)) ||
      !(conn = NAG_ALLOC(3*(2*nvmax-1), Integer)) ||
      !(edge = NAG_ALLOC(3*nedge, Integer)))
    {
      fprintf(fpout, "Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  /* Coordinates of the boundary mesh vertices and boundary edges */

  for (i = 1; i <= nvb; ++i)
    {
      fscanf(fpin, "%ld", &i1);
      fscanf(fpin, "%lf", &COOR(1, i));
      fscanf(fpin, "%lf", &COOR(2, i));
      fscanf(fpin, "%*[^\n] ");
    }

  for (i = 1; i <= nedge; ++i)
    {
      fscanf(fpin, "%ld", &i1);
      fscanf(fpin, "%ld", &EDGE(1, i));
      fscanf(fpin, "%ld", &EDGE(2, i));
      fscanf(fpin, "%ld", &EDGE(3, i));
      fscanf(fpin, "%*[^\n] ");
    }

  fscanf(fpin, " ' %1s '%*[^\n]", pmesh);

  /* Initialise mesh control parameters */

  for (i = 0; i < nvb; ++i) bspace[i] = 0.05;

  smooth = Nag_TRUE;
  itrace = 0;
  coef = 0.75;
  power = 0.25;

  /* Call to the mesh generator */

  /* nag_mesh2d_inc (d06aac).
   * Generates a two-dimensional mesh using a simple
   * incremental method
   */
  nag_mesh2d_inc(nvb, nvmax, nedge, edge, &nv, &nelt, coor, conn, bspace,
                 smooth, coef, power, itrace, 0, &fail);

  if (fail.code == NE_NOERROR)
    {
      if (pmesh[0] == 'N')
        {
          fprintf(fpout, " nv   =%6ld\n", nv);
          fprintf(fpout, " nelt =%6ld\n", nelt);
        }
      else if (pmesh[0] == 'Y')
        {
          /* Output the mesh to view it using the NAG Graphics Library */

          fprintf(fpout, " %10ld%10ld\n", nv, nelt);

          for (i = 1; i <= nv; ++i) fprintf(fpout, "  %15.6e  %15.6e\n",
                                            COOR(1, i), COOR(2, i));

          reftk = 0;
          for (k = 1; k <= nelt; ++k)
            {
              fprintf(fpout, " %10ld%10ld%10ld%10ld\n",
                      CONN(1, k), CONN(2, k), CONN(3, k), reftk);
            }
        }
      else
        {
          fprintf(fpout, "Problem with the printing option Y or N\n");
          exit_status = -1;
          goto END;
        }
    }
  else
    {
      fprintf(fpout, "Error from nag_mesh2d_inc (d06aac).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

 END:
  if (fpin != stdin) fclose(fpin);
  if (fpout != stdout) fclose(fpout);
  if (bspace) NAG_FREE(bspace);
  if (coor) NAG_FREE(coor);
  if (conn) NAG_FREE(conn);
  if (edge) NAG_FREE(edge);

  return exit_status;
}