/* nag_mesh2d_front (d06acc) Example Program. 
 *
 * Copyright 2001 Numerical Algorithms Group.
 *
 * Mark 7, 2001. 
 */
    
#include <math.h>
#include <stdio.h>
#include <nag.h>
#include <nag_stdlib.h>
#include <nagd06.h>

/* Structure to allow data to be passed onto */
/* the d06bac user-supplied function fbnd */

struct user
{
  /* details of the double NACA0012 and the circle around it */

  double x0, y0, x1, y1, radius;
};

static double fbnd(Integer, double, double, Nag_Comm *);

#define EDGE(I,J) edge[3*((J)-1)+(I)-1]
#define LINED(I,J) lined[4*((J)-1)+(I)-1]
#define CONN(I,J) conn[3*((J)-1)+(I)-1]
#define COOR(I,J) coor[2*((J)-1)+(I)-1]
#define COORCH(I,J) coorch[2*((J)-1)+(I)-1]
#define COORUS(I,J) coorus[2*((J)-1)+(I)-1]


int main(void)
{
  const Integer nus=1, nvmax=2000, nedmx=200, nvint=40;
  struct user geom_Naca;
  double dnvint, radius, x0, x1, y0, y1;
  Integer exit_status, i, itrace, j, k, l, ncomp, nedge, nelt, nlines,
    nv, nvb, nvint2, reftk;
  char pmesh[2];
  double *coor=0, *coorch=0, *coorus=0, *rate=0,  *weight=0;
  Integer *conn=0, *edge=0, *lcomp=0, *lined=0, *nlcomp=0;
  NagError fail;
  Nag_Comm comm;

  INIT_FAIL(fail);
  exit_status = 0;

  Vprintf(" d06acc Example Program Results\n\n");

  /* Skip heading in data file */
    
  Vscanf("%*[^\n] ");


  /* Initialise boundary mesh inputs: the number of lines and */
  /* the number of characteristic points of the boundary mesh */

  Vscanf("%ld", &nlines);
  Vscanf("%*[^\n] ");

  /* Allocate memory */

  if ( !(coor = NAG_ALLOC(2*nvmax, double)) ||
       !(coorch = NAG_ALLOC(2*nlines, double)) ||
       !(coorus = NAG_ALLOC(2*nus, double)) ||
       !(rate = NAG_ALLOC(nlines, double)) ||
       !(weight = NAG_ALLOC(nvint, double)) ||
       !(conn = NAG_ALLOC(3*(2*nvmax+5), Integer)) ||
       !(edge = NAG_ALLOC(3*nedmx, Integer)) ||
       !(lined = NAG_ALLOC(4*nlines, Integer)) ||
       !(lcomp = NAG_ALLOC(nlines, Integer)) )
    {
      Vprintf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  /* The double NACA0012 and the circle around it */
    
  for (j = 1; j <= nlines; ++j) Vscanf("%lf", &COORCH(1,j));
  Vscanf("%*[^\n] ");

  for (j = 1; j <= nlines; ++j) Vscanf("%lf", &COORCH(2,j));
  Vscanf("%*[^\n] ");

  /* The lines of the boundary mesh */
    
  for (j = 1; j <= nlines; ++j)
    {
      for (i = 1; i <= 4; ++i) Vscanf("%ld", &LINED(i,j));
      Vscanf("%lf", &rate[j-1]);
    }
  Vscanf("%*[^\n] ");

  /* The number of connected components to */
  /* the boundary and their information */

  Vscanf("%ld", &ncomp);
  Vscanf("%*[^\n] ");

  /* Allocate memory */

  if (!(nlcomp = NAG_ALLOC(ncomp, Integer)) )
    {
      Vprintf("Allocation failure\n");
      exit_status = -1;
      goto END;
    }

  j = 0;
  for (i = 0; i < ncomp; ++i)
    {
      Vscanf("%ld", &nlcomp[i]);
      Vscanf("%*[^\n] ");
      l = j + abs(nlcomp[i]);

      for (k = j; k < l; ++k) Vscanf("%ld", &lcomp[k]);
      Vscanf("%*[^\n] ");

      j += abs(nlcomp[i]);
    }
    
  Vscanf(" ' %1s '%*[^\n]", pmesh);

  /* Data passed to the user-supplied function */

  x0 = 1.5;
  y0 = 0.0;
  radius = 4.5;
  x1 = 0.8;
  y1 = -0.3;

  comm.p = (Pointer)&geom_Naca;

  geom_Naca.x0 = x0;
  geom_Naca.y0 = y0;
  geom_Naca.radius = radius;
  geom_Naca.x1 = x1;
  geom_Naca.y1 = y1;

  itrace = 0;

  /* Call to the 2D boundary mesh generator */

  d06bac(nlines, coorch, lined, fbnd, coorus, nus, rate, ncomp, nlcomp, 
         lcomp, nvmax, nedmx, &nvb, coor, &nedge, edge, itrace, 0, 
         &comm, &fail);

  if (fail.code == NE_NOERROR)
    {
      if (pmesh[0] == 'N')
        {
        
          Vprintf(" Boundary mesh characteristics\n");
          Vprintf(" nvb   =%6ld\n", nvb);
          Vprintf(" nedge =%6ld\n", nedge);
        }
      else if (pmesh[0] == 'Y')
        {

          /* Output the mesh to view it using the NAG Graphics Library */

          Vprintf(" %10ld %10ld\n", nvb, nedge);

          for (i = 1; i <= nvb; ++i) 
            Vprintf("  %4ld  %12.6e  %12.6e  \n", 
                    i, COOR(1,i), COOR(2,i));

          for (i = 1; i <= nedge; ++i) 
            Vprintf(" %4ld %4ld %4ld %4ld\n", 
                    i, EDGE(1,i), EDGE(2,i), EDGE(3,i));
        }
      else
        {
          Vprintf("Problem with the printing option Y or N\n");
          exit_status = -1;
          goto END;
        }
    }
  else
    {
      Vprintf("Error from d06bac.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Initialise mesh control parameters */

  itrace = 0;

  /* Generation of interior vertices */
  /* for the wake of the first NACA */

  nvint2 = nvint/2;
  dnvint = 5.0/(nvint2 + 1.0);

  for (i = 1; i <= nvint2; ++i)
    {
      reftk = nvb + i;
      COOR(1, reftk) = i*dnvint + 1.0;
      COOR(2, reftk) = 0.0;
      weight[i-1] = 0.05;
    }

  /* for the wake of the second one */

  dnvint = 4.19/(nvint2 + 1.0);

  for (i = nvint2+1; i <= nvint; ++i)
    {
      reftk = nvb + i;
      COOR(1, reftk) = (i - nvint2)*dnvint + 1.8;
      COOR(2, reftk) = -0.3;
      weight[i-1] = 0.05;
    }

  /* Call to the 2D Advancing front mesh generator */

  d06acc(nvb, nvint, nvmax, nedge, edge, &nv, &nelt, 
         coor, conn, weight, itrace, 0, &fail);

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

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

          for (i = 1; i <= nv; ++i) 
            Vprintf("  %12.6e  %12.6e\n", COOR(1,i), COOR(2,i));

          reftk = 0;
          for (k = 1; k <= nelt; ++k) 
            Vprintf(" %10ld%10ld%10ld%10ld\n", 
                    CONN(1,k), CONN(2,k), CONN(3,k), reftk);
        }
      else
        {
          Vprintf("Problem with the printing option Y or N\n");
          exit_status = -1;
          goto END;
        }
    }
  else
    {
      Vprintf("Error from d06acc.\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

 END:
  if (coor) NAG_FREE(coor);
  if (coorch) NAG_FREE(coorch);
  if (coorus) NAG_FREE(coorus);
  if (rate) NAG_FREE(rate);
  if (weight) NAG_FREE(weight);
  if (conn) NAG_FREE(conn);
  if (edge) NAG_FREE(edge);
  if (lcomp) NAG_FREE(lcomp);
  if (lined) NAG_FREE(lined);
  if (nlcomp) NAG_FREE(nlcomp);

  return exit_status;
}

static double fbnd(Integer i, double x, double y, Nag_Comm *pcomm)
{
  double ret_val;
  double c, radius, x0, x1, y0, y1;
  struct user *geom_Naca = (struct user *)pcomm->p;

  x0 = geom_Naca->x0;
  y0 = geom_Naca->y0;
  radius = geom_Naca->radius;
  x1 = geom_Naca->x1;
  y1 = geom_Naca->y1;

  ret_val = 0.0;

  switch (i)
    {
    case 1:

      /* upper NACA0012 wing beginning at the origin */

      c = 1.008930411365;

      ret_val = 0.6*(0.2969*sqrt(c*x) - 0.126*(c*x) - 0.3516*pow(c*x,2.0) 
                    + 0.2843*pow(c*x,3.0) - 0.1015*pow(c*x,4.0)) - c*y;
      break;
 
    case 2:

      /* lower NACA0012 wing beginning at the origin */

      c = 1.008930411365;

      ret_val = 0.6*(0.2969*sqrt(c*x) - 0.126*(c*x) - 0.3516*pow(c*x,2.0)
                    + 0.2843*pow(c*x,3.0) - 0.1015*pow(c*x,4.0)) + c*y;

      break;

    case 3:

      /* the circle around the double NACA */

      ret_val = (x-x0)*(x-x0) + (y-y0)*(y-y0) - radius*radius;
      break;

    case 4:

      /* upper NACA0012 wing beginning at (X1;Y1) */

      c = 1.008930411365;

      ret_val = 0.6*(0.2969*sqrt(c*(x-x1)) - 0.126*c*(x-x1) - 
                     0.3516*pow(c*(x-x1),2.0) + 0.2843*pow(c*(x-x1),3.0) -
                     0.1015*pow(c*(x-x1),4.0)) - c*(y-y1);
      break;

    case 5:

      /* lower NACA0012 wing beginning at (X1;Y1) */

      c = 1.008930411365;

      ret_val = 0.6*(0.2969*sqrt(c*(x-x1)) - 0.126*(c*(x-x1)) - 
                     0.3516*pow(c*(x-x1),2.0) + 0.2843*pow(c*(x-x1),3.0) -
                     0.1015*pow(c*(x-x1),4.0)) + c*(y-y1);
      break;
    }

  return ret_val;
}