File: iges.cmd

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// iges.cmd
// Surface Evolver script to write IGES file for surface, using IGES
// parametric patches, type 114.

/*
   Assumptions: 3D soapfilm model, linear model, not torus or symmetry group
    (use the "detorus" command if necessary to convert torus or symmetry
     to unwrapped surface, but remember that detorus alters the surface)
   Does facets only, not edges. 
   Does all facets, regardless of "show" criterion.
   Facet color is frontcolor on both sides.
*/

// usage: iges >>> "filename.igs"

// Set up color translation array
define iges_colors integer [16];
iges_black := 1
//iges_colors[black] := 1
iges_colors[red]   := 2
iges_colors[green] := 3
iges_colors[blue]  := 4
iges_colors[yellow] := 5
iges_colors[magenta] := 6
iges_colors[cyan]  := 7
iges_colors[white] := 8
iges_colors[brown]  := 2 // red
iges_colors[lightgray]  := 8 // white
iges_colors[darkgray]  := 1 // black
iges_colors[lightblue]  := 4 // blue
iges_colors[lightcyan]  := 7 // cyan
iges_colors[lightred]  := 2 // red
iges_colors[lightmagenta]  := 7

iges := { 

  local start_counter,global_counter,message,xmax,ymax,zmax;
  local maxsize,entype,paramdata,structure,linefont,level,view;
  local transmat,label,status,directory_counter,lineweight;
  local colornum,paramcount,form,reserved,entlabel,entsubscr;
  local parameter_counter,ctype,ptype,mvalue,nvalue,minu,maxu;
  local minv,maxv,co00,co10,co01,co11,line,subcount;

  // Check assumptions
  if torus then
  { errprintf "Cannot run 'iges' command in torus mode. Do 'detorus' first.\n";
    abort;
  };

if space_dimension != 3 then
  { errprintf "The 'iges' command must be run in three-dimensional space.\n";
    abort;
  };

  if surface_dimension == 1 then
  { errprintf "The 'iges' command is not meant for the string model.\n";
    abort;
  };

  if simplex_representation then
  { errprintf "The 'iges' command is not meant for the simplex model.\n";
    abort;
  };

  if lagrange_order >= 2 then
  { errprintf "The 'iges' command is meant for the linear model, not quadratic or Lagrange.\n";
    abort;
  };

  if rgb_colors then
  { errprintf "The 'iges' command does not do RGB colors; do rgb_colors off.\n";
    abort;
  };
  // Flag section
  // Don't need this since not doing binary or compressed format.

  // Start section
  start_counter := 0;

  start_counter += 1;
  printf "%-72sS%07d\n","IGES version of Surface Evolver surface",start_counter;
  start_counter += 1;
  printf "   %-69sS%07d\n",datafilename,start_counter;
  start_counter += 1;
  printf "%-72sS%07d\n","Created using iges.cmd Evolver script.",
     start_counter;

  // Global section
  global_counter := 0;

  global_counter += 1;
  printf "%-72sG%07d\n","1H,,1H;,",global_counter;
  global_counter += 1;
  printf "%02dH%-69sG%07d\n",sizeof("Surface Evolver"),"Surface Evolver,",
     global_counter;
  global_counter += 1;
  message := sprintf "%s,",datafilename;
  printf "%02dH%-69sG%07d\n",sizeof(datafilename),message,global_counter;
  global_counter += 1;
  printf "%02dH%-69sG%07d\n",sizeof("Surface Evolver"),"Surface Evolver,",
     global_counter;
  global_counter += 1;
  printf "%02dH%-69sG%07d\n",sizeof("Surface Evolver"),"Surface Evolver,",
     global_counter;
  global_counter += 1;
  printf "%-72sG%07d\n","32,75,6,75,15,,1.0,1,2HIN,32768,0.0394,",
    global_counter;
  global_counter += 1;
  printf "%-72sG%07d\n","15H00000000.000000,", global_counter; // date

  xmax := max(vertex,abs(x));
  ymax := max(vertex,abs(y));
  zmax := max(vertex,abs(z));
  maxsize := (xmax > ymax) ? xmax : ymax;
  maxsize := (zmax > maxsize) ? zmax : maxsize;
  message := sprintf "%g,%g,",maxsize/10000000,maxsize;
  global_counter += 1;
  printf "%-72sG%07d\n",message, global_counter; 
  
  global_counter += 1;
  printf "%02dH%-69sG%07d\n",sizeof("Name of author"),"Name of author,", 
       global_counter; 
  global_counter += 1;
  printf "%02dH%-69sG%07d\n",sizeof("Author's organization"),
      "Author's organization,", global_counter;
  global_counter += 1;
  printf "%-72sG%07d\n","15H00000000.000000;", global_counter; // date

  // Directory entry section. Each entry 20 8-char fields on two lines.
  // Fields with default values
  entype := 0;      // 1 and 11
  paramdata := 1;   // 2
  structure := 0;   // 3
  linefont  := 0;   // 4
  level     := 0;   // 5
  view      := 0;   // 6
  transmat  := 0;   // 7
  label     := 0;   // 8
  status    := "00000000";   // 9; actually 4 two-digit numbers
  directory_counter := 0;  // 10 and 20
  lineweight := 0;   // 12
  colornum   := 0;   // 13
  paramcount := 0;   // 14
  form       := 0;   // 15
  reserved   := "        ";   // 16 and 17
  entlabel   := "entity";  // 18
  entsubscr  := 0;   // 19
 

  // Facets as "parametric surface" types
  entype := 114;
  status := "00010001";
  paramcount := 1;
  entlabel := "   FACET";
  define facet attribute fpdata integer;
  define facet attribute fdir integer;
  foreach facet ff where show and color >= 0 do 
  { ff.fpdata := paramdata;
    entsubscr  := ff.id; 
    directory_counter += 1;  ff.fdir := directory_counter;
    printf "%8d%8d%8d%8d%8d%8d%8d%8d%8sD%7d\n",entype,paramdata,
      structure,linefont,level,view,transmat,label,status,
      directory_counter;
    directory_counter += 1;
    printf "%8d%8d%8d%8d%8d%8s%8s%8s%8dD%7d\n",entype,lineweight,
      (ff.color == BLACK ? iges_black : iges_colors[ff.color]), 
      paramcount,form,reserved,reserved,
      entlabel,entsubscr,directory_counter;
    paramdata += 7;
  }; 
  // Geometry element
  entype := 402;
  status := "00000301";
  paramcount := ceil(facet_count/10);
  form := 7;
  entlabel := " SURFACE";
  entsubscr  := 1; 
  directory_counter += 1;  
  printf "%8d%8d%8d%8d%8d%8d%8d%8d%8sD%7d\n",entype,paramdata,structure,
     linefont,level,view,transmat,label,status,directory_counter;
  directory_counter += 1;
  printf "%8d%8d%8d%8d%8d%8s%8s%8s%8dD%7d\n",entype,lineweight,colornum,
     paramcount,form,reserved,reserved,entlabel,entsubscr,directory_counter;


  // Parameter data section
  parameter_counter := 0;

  // Facets
  entype := 114;
  ctype := 1;  // linear
  ptype := 0;  // unspecified
  mvalue := 1;  // number of u segments
  nvalue := 1;  // number of v segments
  minu := 0;
  maxu := 1;
  minv := 0;
  maxv := 1;
  foreach facet ff where show and color >= 0 do
  { parameter_counter += 1;
    if ff.fpdata != parameter_counter then
       errprintf
     "ERROR: bad facet parameter line number, facet %d. Is %d, should be %d.\n",
         ff.id,parameter_counter,ff.fpdata;
    message := sprintf "%d,%d,%d,%d,%d,%g,%g,%g,%g,",entype,ctype,ptype,
         mvalue,nvalue,minu,maxu,minv,maxv;
    printf "%-64s%8dP%7d\n",message,ff.fdir,parameter_counter;
    co00 := ff.vertex[1].x;
    co10 := ff.vertex[2].x-ff.vertex[1].x;
    co01 := ff.vertex[3].x-ff.vertex[1].x;
    co11 := ff.vertex[1].x-ff.vertex[2].x;
    message := sprintf "%10.7f,%10.7f,0,0,%10.7f,%10.7f,0,0,",
       co00,co10,co01,co11;
    parameter_counter += 1;
    printf "%-64s%8dP%7d\n",message,ff.fdir,parameter_counter;
    message :=  "0,0,0,0,0,0,0,0,";
    parameter_counter += 1;
    printf "%-64s%8dP%7d\n",message,ff.fdir,parameter_counter;
    co00 := ff.vertex[1].y;
    co10 := ff.vertex[2].y-ff.vertex[1].y;
    co01 := ff.vertex[3].y-ff.vertex[1].y;
    co11 := ff.vertex[1].y-ff.vertex[2].y;
    message := sprintf "%10.7f,%10.7f,0,0,%10.7f,%10.7f,0,0,",
       co00,co10,co01,co11;
    parameter_counter += 1;
    printf "%-64s%8dP%7d\n",message,ff.fdir,parameter_counter;
    message :=  "0,0,0,0,0,0,0,0,";
    parameter_counter += 1;
    printf "%-64s%8dP%7d\n",message,ff.fdir,parameter_counter;
    co00 := ff.vertex[1].z;
    co10 := ff.vertex[2].z-ff.vertex[1].z;
    co01 := ff.vertex[3].z-ff.vertex[1].z;
    co11 := ff.vertex[1].z-ff.vertex[2].z;
    message := sprintf "%10.7f,%10.7f,0,0,%10.7f,%10.7f,0,0,",
       co00,co10,co01,co11;
    parameter_counter += 1;
    printf "%-64s%8dP%7d\n",message,ff.fdir,parameter_counter;
    message :=  "0,0,0,0,0,0,0,0,";
    parameter_counter += 1;
    printf "%-64s%8dP%7d\n",message,ff.fdir,parameter_counter;
  };
  // Geometry element
  line := sprintf "402,%d,",facet_count;
  subcount := 0;
  foreach facet ff where show and color >= 0 do
  { if subcount == 10 then
    { 
      parameter_counter += 1;
      printf "%-64s%8dP%7d\n",line,directory_counter-1,parameter_counter;
      line := "" ;
      subcount := 0;
    };
    line := sprintf"%s%d,",line,ff.fdir;
    subcount += 1;
  };
  line := sprintf "%s0,0;",line;  // sample files ended with 2 extra 0's
  parameter_counter += 1;
  printf "%-64s%8dP%7d\n",line,directory_counter-1,parameter_counter;

 
  // Terminate section
  printf "S%07dG%07dD%07dP%07d%40sT0000001\n",start_counter,global_counter,
     directory_counter,parameter_counter," ";
}

// End iges.cmd

// Usage: iges >>> "filename.igs"