lbio_03082005.c

基于格子Boltzmann方法开源可视化软件的源代码 具有很高的实用价值。对学习LBM方法及其软件开发非常游泳

          green_val = (char)200;
          blue_val  = (char)200;
          val       = (char)200;
        }
        else
        {
          red_val   = (char)184;
          green_val = (char)184;
          blue_val  = (char)184;
          val       = (char)184;
        }
#else /* !( SOLID_COLOR_IS_CHECKERBOARD) */
#if SOLID_COLOR_IS_BLACK
        red_val   = (char)0;
        green_val = (char)0;
        blue_val  = (char)0;
        val       = (char)0;
#else /* !( SOLID_COLOR_IS_BLACK) */
        red_val   = (char)255;
        green_val = (char)255;
        blue_val  = (char)255;
        val       = (char)255;
#endif /* SOLID_COLOR_IS_BLACK */
#endif /* SOLID_COLOR_IS_CHECKERBOARD */

      } /* if( lattice->bc[subs][ n].bc_type == 0) else */

//printf("blue_val( %d, %d) = %d\n", i, j, (int)blue_val);

      if( fwrite( &blue_val, 1, 1, o) != 1) { printf("%s %d >> BOOM!\n", __FILE__, __LINE__); exit(1);}
      //printf("BING %d %d\n", i, j);
      if( fwrite( &green_val, 1, 1, o) != 1) { printf("%s %d >> BOOM!\n", __FILE__, __LINE__); exit(1);}
      //printf("BING %d %d\n", i, j);
      if( fwrite( &red_val, 1, 1, o) != 1) { printf("%s %d >> BOOM!\n", __FILE__, __LINE__); exit(1);}
      //printf("BING %d %d\n", i, j);
     
    } /* for( i=0; i<lattice->param.LX; i++) */

    // Pad for 4-byte boundaries.
    val = (char)0;
    for( i=0; i<pad; i++)
    {
      if( fwrite( &val, 1, 1, o) != 1) { printf("%s %d >> BOOM!\n", __FILE__, __LINE__); exit(1);}
    }

  } /* for( j=0; j<lattice->param.LY; j++) */

  fclose(o);

#if VERBOSITY_LEVEL > 0
  printf("rho2bmp() -- Wrote file \"%s\".\n", filename);
#endif /* VERBOSITY_LEVEL > 0 */

 } /* for( subs=0; subs<NUM_FLUID_COMPONENTS; subs++) */

  if( lattice->param.use_colormap)
  {
    deallocate_colormap( &colormap, num_colors);
  }

#if SAY_HI
  printf("rho2bmp() -- Bye!\n");
  printf("\n");
#endif /* SAY_HI */

} /* rho2bmp( lattice_ptr lattice, int time) */
#else
void rho2bmp( lattice_ptr lattice, int time)
{
  FILE   *in, 
         *o;
  int    i, j, 
         n, m;
  int    pad, 
         bytes_per_row;
  int    frame;
  char   k;
  char   b;
  struct bitmap_file_header bmfh;
  struct bitmap_info_header bmih;
  struct rgb_quad rgb;
  int    *int_ptr;
  short  int *short_int_ptr;
  int    *width_ptr;
  int    *height_ptr;
  short  int *bitcount_ptr;
  char   filename[1024];
  char   red_val, 
         green_val, 
         blue_val, 
         val;
  double min_rho, max_rho;
  int    subs;

#if SAY_HI
  printf("rho2bmp() -- Hi!\n");
#endif /* SAY_HI */

 compute_max_rho( lattice, &min_rho, 0);
 compute_max_rho( lattice, &max_rho, 1);

 for( subs=0; subs<NUM_FLUID_COMPONENTS; subs++)
 {

  frame = time/lattice->param.FrameRate;

  sprintf( filename, "./in/%dx%d.bmp", lattice->param.LX, lattice->param.LY);
  if( !( in = fopen( filename, "r")))
  {
    printf("rho2bmp() -- Error opening file \"%s\".\n", filename);
    exit(1);
  }

  // n = fread( void *BUF, size_t SIZE, size_t COUNT, FILE *FP);

  n = fread( &bmfh, sizeof(struct bitmap_file_header), 1, in );
  if( strncmp(bmfh.bfType,"BM",2))
  {
    printf("ERROR: Can't process this file type.  Exiting!\n");
    printf("\n");
    exit(1);
  }
  n = fread( &bmih, sizeof(struct bitmap_info_header), 1, in );
  int_ptr = (int*)bmih.biCompression;
  if( *int_ptr != 0)
  {
    printf("ERROR: Can't handle compression.  Exiting!\n");
    printf("\n");
    exit(1);
  }

  width_ptr = (int*)bmih.biWidth;
  height_ptr = (int*)bmih.biHeight;
  bitcount_ptr = (short int*)bmih.biBitCount;

  // Read palette entries, if applicable.
  if( *bitcount_ptr < 24)
  {
    n = (int)pow(2.,(double)*bitcount_ptr); // Num palette entries.
    for( i=0; i<n; i++)
    {
      k = fread( &rgb, sizeof(struct rgb_quad), 1, in );
      if( k!=1)
      {
        printf("Error reading palette entry %d.  Exiting!\n", i);
        exit(1);
      }
    }
  }

  fclose(in);

  // Bytes per row of the bitmap.
  bytes_per_row = 
    ((int)ceil(( (((double)(*width_ptr))*((double)(*bitcount_ptr)))/8.)));

  // Bitmaps pad rows to preserve 4-byte boundaries.
  // The length of a row in the file will be bytes_per_row + pad .
  pad = ((4) - bytes_per_row%4)%4;

  sprintf( filename, "./out/rho%dx%d_frame%04d_subs%02d.bmp", 
      lattice->param.LX, 
      lattice->param.LY, 
      frame, subs);
  if( !( o = fopen( filename, "w+")))
  {
    printf("ERROR: fopen( \"%s\", \"w+\") = NULL.  Bye, bye!\n", filename);
    exit(1);
  }

  fwrite( &bmfh, sizeof(struct bitmap_file_header), 1, o );
  fwrite( &bmih, sizeof(struct bitmap_info_header), 1, o );

  for( j=0; j<lattice->param.LY; j++)
  {
    n = j*lattice->param.LX;

    for( i=0; i<lattice->param.LX; i++, n++)
    {
      if( lattice->bc[subs][ n].bc_type == /*FLUID_NODE*/0)
      {
        red_val = (char)0;
        green_val = (char)0;

        red_val = 
(char)ROUND( 255.*(lattice->macro_vars[subs][ n].rho - min_rho)/(max_rho-min_rho));
        blue_val = (char)255-red_val;

      } /* if( lattice->bc[subs][ n].bc_type == 0) */

      else // lattice->bc[subs][ n].bc_type != 0
      {
#if SOLID_COLOR_IS_CHECKERBOARD
        // Checkerboard pattern over the solids and boundary conditions.
        if( (i+j)%2)
        {
          red_val   = (char)200;
          green_val = (char)200;
          blue_val  = (char)200;
          val       = (char)200;
        }
        else
        {
          red_val   = (char)184;
          green_val = (char)184;
          blue_val  = (char)184;
          val       = (char)184;
        }
#else /* !( SOLID_COLOR_IS_CHECKERBOARD) */
#if SOLID_COLOR_IS_BLACK
        red_val   = (char)0;
        green_val = (char)0;
        blue_val  = (char)0;
        val       = (char)0;
#else /* !( SOLID_COLOR_IS_BLACK) */
        red_val   = (char)255;
        green_val = (char)255;
        blue_val  = (char)255;
        val       = (char)255;
#endif /* SOLID_COLOR_IS_BLACK */
#endif /* SOLID_COLOR_IS_CHECKERBOARD */

      } /* if( lattice->bc[subs][ n].bc_type == 0) else */

//printf("blue_val( %d, %d) = %d\n", i, j, (int)blue_val);

      if( fwrite( &blue_val, 1, 1, o) != 1) { printf("%s %d >> BOOM!\n", __FILE__, __LINE__); exit(1);}
      //printf("BING %d %d\n", i, j);
      if( fwrite( &green_val, 1, 1, o) != 1) { printf("%s %d >> BOOM!\n", __FILE__, __LINE__); exit(1);}
      //printf("BING %d %d\n", i, j);
      if( fwrite( &red_val, 1, 1, o) != 1) { printf("%s %d >> BOOM!\n", __FILE__, __LINE__); exit(1);}
      //printf("BING %d %d\n", i, j);
     
    } /* for( i=0; i<lattice->param.LX; i++) */

    // Pad for 4-byte boundaries.
    val = (char)0;
    for( i=0; i<pad; i++)
    {
      if( fwrite( &val, 1, 1, o) != 1) { printf("%s %d >> BOOM!\n", __FILE__, __LINE__); exit(1);}
    }

  } /* for( j=0; j<lattice->param.LY; j++) */

  fclose(o);

#if VERBOSITY_LEVEL > 0
  printf("rho2bmp() -- Wrote file \"%s\".\n", filename);
#endif /* VERBOSITY_LEVEL > 0 */

 } /* for( subs=0; subs<NUM_FLUID_COMPONENTS; subs++) */

#if SAY_HI
  printf("rho2bmp() -- Bye!\n");
  printf("\n");
#endif /* SAY_HI */

} /* rho2bmp( lattice_ptr lattice, int time) */
#endif

// void u2bmp( char *filename, int time)
//##############################################################################
//
// U 2 B M P 
//
void u2bmp( lattice_ptr lattice, int time)
{
  FILE   *in, 
         *o_u,
         *o_ux,
         *o_uy;
  int    i, j, 
         n, m;
  int    pad, 
         bytes_per_row;
  int    frame;
  char   k;
  char   b;
  struct bitmap_file_header bmfh;
  struct bitmap_info_header bmih;
  struct rgb_quad rgb;
  int    *int_ptr;
  short  int *short_int_ptr;
  int    *width_ptr;
  int    *height_ptr;
  short  int *bitcount_ptr;
  char   filename[1024];
  char   red_val, 
         green_val, 
         blue_val, 
         val;
  double max_u[2], maxu;
  double u_x, u_y, u;
  int    subs;

#if SAY_HI
  printf("u2bmp() -- Hi!\n");
#endif /* SAY_HI */

 for( subs=0; subs<NUM_FLUID_COMPONENTS; subs++)
 {

  frame = time/lattice->param.FrameRate;

  sprintf( filename, "./in/%dx%d.bmp", lattice->param.LX, lattice->param.LY);
  if( !( in = fopen( filename, "r")))
  {
    printf("u2bmp() -- Error opening file \"%s\".\n", filename);
    exit(1);
  }

  // n = fread( void *BUF, size_t SIZE, size_t COUNT, FILE *FP);

  n = fread( &bmfh, sizeof(struct bitmap_file_header), 1, in );
  if( strncmp(bmfh.bfType,"BM",2))
  {
    printf("ERROR: Can't process this file type.  Exiting!\n");
    printf("\n");
    exit(1);
  }
  n = fread( &bmih, sizeof(struct bitmap_info_header), 1, in );
  int_ptr = (int*)bmih.biCompression;
  if( *int_ptr != 0)
  {
    printf("ERROR: Can't handle compression.  Exiting!\n");
    printf("\n");
    exit(1);
  }

  width_ptr = (int*)bmih.biWidth;
  height_ptr = (int*)bmih.biHeight;
  bitcount_ptr = (short int*)bmih.biBitCount;

  // Read palette entries, if applicable.
  if( *bitcount_ptr < 24)
  {
    n = (int)pow(2.,(double)*bitcount_ptr); // Num palette entries.
    for( i=0; i<n; i++)
    {
      k = fread( &rgb, sizeof(struct rgb_quad), 1, in );
      if( k!=1)
      {
        printf("Error reading palette entry %d.  Exiting!\n", i);
        exit(1);
      }
    }
  }

  fclose(in);

  // Bytes per row of the bitmap.
  bytes_per_row = 
    ((int)ceil(( (((double)(*width_ptr))*((double)(*bitcount_ptr)))/8.)));

  // Bitmaps pad rows to preserve 4-byte boundaries.
  // The length of a row in the file will be bytes_per_row + pad .
  pad = ((4) - bytes_per_row%4)%4;

  compute_max_u( lattice, max_u, subs);

  sprintf( filename, "./out/u%dx%d_frame%04d_subs%02d.bmp", 
      lattice->param.LX, 
      lattice->param.LY, 
      frame, subs);
  if( !( o_u = fopen( filename, "w+")))
  {
    printf("ERROR: fopen( \"%s\", \"w+\") = NULL.  Bye, bye!\n", filename);
    exit(1);
  }

  sprintf( filename, "./out/u_x%dx%d_frame%04d_subs%02d.bmp", 
      lattice->param.LX, 
      lattice->param.LY, 
      frame, subs);
  if( !( o_ux = fopen( filename, "w+")))
  {
    printf("ERROR: fopen( \"%s\", \"w+\") = NULL.  Bye, bye!\n", filename);
    exit(1);
  }

  sprintf( filename, "./out/u_y%dx%d_frame%04d_subs%02d.bmp", 
      lattice->param.LX, 
      lattice->param.LY, 
      frame, subs);
  if( !( o_uy = fopen( filename, "w+")))
  {
    printf("ERROR: fopen( \"%s\", \"w+\") = NULL.  Bye, bye!\n", filename);
    exit(1);
  }

  fwrite( &bmfh, sizeof(struct bitmap_file_header), 1, o_u );
  fwrite( &bmih, sizeof(struct bitmap_info_header), 1, o_u );

  fwrite( &bmfh, sizeof(struct bitmap_file_header), 1, o_ux );
  fwrite( &bmih, sizeof(struct bitmap_info_header), 1, o_ux );

  fwrite( &bmfh, sizeof(struct bitmap_file_header), 1, o_uy);
  fwrite( &bmih, sizeof(struct bitmap_info_header), 1, o_uy);

  //for( j=lattice->param.LY-1; j>=0; j--)
  for( j=0; j<lattice->param.LY; j++)
  {
    n = j*lattice->param.LX;

    for( i=0; i<lattice->param.LX; i++, n++)
    {
      if( lattice->bc[subs][ n].bc_type == /*FLUID_NODE*/0)
      {
#if 1
        blue_val  = (char)0;
        green_val = (char)0;
        red_val   = (char)0;

        u_x = (lattice->macro_vars[subs][ n].u[0]);
        u_y = (lattice->macro_vars[subs][ n].u[1]);

        u = sqrt(u_x*u_x + u_y*u_y);
        maxu = sqrt( max_u[0]*max_u[0] + max_u[1]*max_u[1]);

        if( lattice->bc[subs][ n].bc_type & BC_SOLID_NODE)
        {
          blue_val  = (char)ROUND( 128.*fabs(u_x)/max_u[0]);
          green_val = (char)ROUND( 128.*fabs(u_y)/max_u[1]);

        } /* if( lattice->bc[subs][ n].bc_type & BC_SOLID_NODE) */

        else // !( lattice->bc[subs][ n].bc_type & BC_SOLID_NODE)
        {
#if 0
          blue_val  = (char)ROUND(  255.*fabs(u_x)/max_u[0]);
          green_val = (char)ROUND(  255.*fabs(u_y)/max_u[1]);
          red_val   = 0.;//(char)ROUND( 128.*fabs(u)/maxu);
#else
          blue_val  = (char)ROUND(  255.*fabs(u_x)/maxu);
          green_val = (char)ROUND(  255.*fabs(u_y)/maxu);
          red_val   = 0.;//(char)ROUND( 128.*fabs(u)/maxu);
#endif

        } /* if( lattice->bc[subs][ n].bc_type & BC_SOLID_NODE) else */
#else
        blue_val  = (char)255;
        green_val = (char)255;
        red_val   = (char)255;

        u = sqrt(u_x*u_x + u_y*u_y);
        maxu = sqrt( max_u[0]*max_u[0] + max_u[1]*max_u[1]);

        //if( fabs(u) > .1*maxu)
        //{
          green_val  = (char)ROUND( 255.-255.*fabs(u)/maxu);
          red_val    = (char)ROUND( 255.-255.*fabs(u)/maxu);
          blue_val    = (char)ROU