/*  xgrow.c

  This code is freely distributable.
           
  History:
   Originally X-Automatalab by Michael Creutz creutz@wind.phy.bnl.gov
   modified for excitable media by Erik Winfree Nov 1995
     modifications mostly in parallelupdate()
   modified again for DNA self-assembly simulations by Erik Winfree March 1996
     new non-parallel update, + simulated annealing & energy calculations
   3/25/96 changed S.A. model so that in empty space, emptiness is
     overwhelmingly favored.  added random number seed control.
   11/8/98 split into two modules: xgrow.c and grow.c
     simulation completely re-vamped for hierarchical kinetic model
   11/27/98 added "error" colors... hydrolysis sim.
   1/29/99  added output data
   10/28/01 Xwindows didn't work on new 16-bit displays...
            incorporating a few minor mods from Cruetz's latest&greatest
            But, some problems with fission fragments not disappearing?
   7/5/02   Michael DeLorimier adds general tile definitions
   7/6/02   EW generalizes hydrolysis rules for any tile set
   7/12/02  EW adds GUI for changing Gse and Gmc during simulation
   7/16/02  EW adds irreversible Tile Assembly Model
   7/17/02  EW adds default param defs to be read from tile file 
            (can be overwritten by command line)
            Allow more field sizes, not just 256, and larger blocks.
              (Note: crashes if you try too large for your display)
            Allowed variable display rates.
            Optimized choose_cell() and update_rates() using gprof.
            Put estimated [DX] and temp on display 
               (from thesis pg 63, "Simulations" (1998) pg 10)
   7/19/02  Major revision for multiple flakes.  
            Created "tube" structure to keep sim params.
   5/2/03   minor enhancements by EW: 
            comments in tile file are allowed
   5/3/03   added buttons for producing a "sample" AFM deposition image,
               drawn from the distribution of flakes being simulated
            and for exporting array information for MATLAB reading.
            added 'fission_allowed' option, so as to disable
               fission-causing dissociations.  this is now the default!
            when considering flake_fission: 
               if 'wander' is set, and the cell chosen to 
               dissociate is the seed, then move the seed to its neighbor.
               although 'wander' is the "right" model, it sometimes looks
               strange, so I won't make it the default (yet).
            nice little boxes drawn around blocks, if blocks>4
            simulation no longer stops when event counter wraps around.
   5/11/03  changed behavior for flakes with []'s:
               if the flake is a single tile, then it "absorbs" no []
               thus, an excess of single-tile flakes won't decrease the
               free monomer concentration experienced by the other flakes.
               coding implications: 
                 no monomer depletion when initializing single-tile seed flakes.
                 when dimer flakes lose a tile, *both* concentrations are restored.
                 when monomer flake gains a tile, *both* concentrations are depleted.
            changed seed tile behavior for rates: 
               event for removing seed tile is always present (unless tiles==1) 
               but it may have no effect (except to increment time)
                 if seed can't wander.    
               if monomer flake can't grow (because flake_conc > all seed tile conc)
                 then seed tile type changes to a random value
                 and this counts as a "hydrolysis" event, oddly enough
            sampling now ignores monomer tiles if possible
            flake G now reports G_bonds + G_concs *including* the seed tile
               (if wander is off, then screen display offsets for seed tile [])
            actually fixed the simulation event counter wrap-around.
   5/25/03  enhanced tile file definition to allow X named colors.
               e.g., {2 3 5 1}[.4](purple)
   summer 03 Added command-line option to read in initial tile assembly.  (Shaun Lee)
   10/14/03 Changed format of input file to allow a generalized strength function of the form
              g(a,b) = c where a and b are tile types, and c is the floating point strength.
	      (Rebecca Schulman)
   11/10/03 Adding chunk_fission option.  When set, not only can single tiles dissociate,
            but pairs of tiles and 2x2 blocks can dissociate.  Implies fission.
            Should work with periodic and wander options, also.
            Was a bit hairy, especially with boundary conditions.  
            Probably a few bugs still lurk here -- I yearn for automated testing.
            chunk_fission is incompatible with hydrolysis rules.
              (Erik Winfree)
   11/16/03 Fixed color use for Err & Hyd display.
            Fixed puncture so it fissions if you cut the flake in two.
            Added error messages when tile file read fails.
            Added middle mouse click -> tile # underneath pointer is identified.

  TO DO List:
  
  * tile files should allow sticky ends to be specified by string labels rather
    than numbers.  num_tiles and num_bindings should be ignored, and inferred from
    the file.  (compatibility with existing xgrow tile files must be maintained.)
  * Would like auto-rotate for tile files, to simulate DAO-E flip, DAE-O symmetry, etc.
  * Is it possible to reverse the random-number generator, so as to "reverse time"?
    That way, you see something interesting, and you can ask "How did that happen again?"
    In that case, it would be useful to have GUI to change update_rate.
  * Would be nice to change other parameters in addition to Gse, Gmc.  E.g. inc/dec by
    left/right mouse click on the numbers in the display.
  * Something like "multiflakes=100@27" argument does "the right thing"
       by adding 100 flakes for each tile type, at Gfc=27+stoich,
           with each seed centered in the field,
       defaults to "wander"
  * Event counter should simply have more bits!
  * Should CONNECTED be true for mismatched sticky ends??  Currently, it is.
    Only not connected if bond 0 is involved.  (But zero-strength bonds connect.)
    Freaky, but no speckle of tiles around the edge if all zero-strength interactions
    immediately & instantly dissociate.  Related: mismatches (Mism) and errortile()
    ought to be redefined to be sensible for g() type glues implementing complementary
    (rather than self-complementary) sticky ends.
  * This might fix the major slow-down bug we suffer from: if strength-0 edges abut a
    growing region (as happens when sierpinski boundary erroneously grows inside the
    flake) the dissociations are frequent, and will require flake_fission fills to
    be performed.  If it can be observered that the dissociating tile did not bond
    with the strength-0 side in the first place, then we can quickly obviate the full
    fill call.
  * In no-fission mode, one can get caught up on very fast -- but disallowed --
    dissociations, which must be rejected.  This is not good. 
    (not sure if this is still true.  EW 11/10/03)
  * rubberbanding for "puncture"
  * green dot (current value), red dot (selection cursor) for Gse/Gmc mouse choice
  * fp->G nan and other discrepencies should be tracked down.
  * Very Much want to implement a Surface mode, with Gsf for the surface, and
    allowing disconnected flakes.

  Compiling:  see makecc and makeccprof and makeccefence

gcc -O -Wall -g -o xgrow xgrow.c grow.c -I/usr/X11R6/include -L/usr/X11R6/lib -lX11 -lm
    
*/

# include <X11/Xlib.h>
# include <X11/Xutil.h>
# include <X11/Xos.h>
# include <X11/Xatom.h> 
# include <stdio.h>
# include <stdlib.h>
# include <sys/time.h>
# include <unistd.h>
# include <math.h>
# include <assert.h>

# include "grow.h"

 /* lattice dimensions (plus two for boundaries): */
 /* NCOLS should be a multiple of bytes per long word (BPW) */
         /* THIS is for X bitmap stuff, so add total 4 for boundary */
# define NBDY 2
/* THESE BECOME VARIABLES, NOW THAT FIELD SIZE IS VARIABLE 
# define NROWS (256+NBDY*2)
# define NCOLS (256+NBDY*2)
# define VOLUME (NROWS*NCOLS)

# define WINDOWWIDTH (block*NCOLS+PLAYLEFT+BOUNDWIDTH+20)
# define WINDOWHEIGHT (PLAYTOP+block*NROWS+10)
*/
# define PLAYTOP 120
# define PLAYLEFT 10
# define BOUNDHEIGHT 80
# define LATTICEHEIGHT 60
# define BOUNDWIDTH  140
# define BARHEIGHT 45
# define BARWIDTH  135
# define BARTOP 55
# define BARLEFT 4
# define XHEIGHT 40
# define NSIZE 42
# define MAXTILETYPES 256

long int translate[MAXTILETYPES]; /* for converting colors */
int paused=0, errorc=0, sampling=0;
int export_mode=0, export_flake_n=1, export_movie_n=1, export_movie=0; 
FILE *export_fp=NULL;
int update_rate=10000;
static char *progname;
char stringbuffer[256];
char tileset_name[256];

/* various window stuff */
Display *display;
int screen;
Window window,quitbutton,pausebutton,playground,
        restartbutton,colorbutton,flakebutton,seedbutton,tempbutton, 
        fissionbutton, samplebutton, exportbutton;
GC gc, gcr, gccolor;
XImage *spinimage=NULL;
XFontStruct *font=NULL;
int font_height;
XSizeHints size_hints;
long event_mask;
int depth;
long int darkcolor,lightcolor,black,white,errorcolor,goodcolor,hydrocolor,hydroerrcolor;
char *tile_colors[MAXTILETYPES]={ "black",
  "blue",      "red",      "green",      "yellow", "gold",   "purple", "white", 
  "dark blue", "dark red", "dark green", "wheat",  "orange", "cyan",   "light grey"};
  

/* simulation parameters */
tube *tp; flake *fp; 
double Gse, Gmc, ratek, T;
double Gseh, Gmch, Ghyd, Gas, Gam, Gae, Gah, Gao, Gfc;


int NROWS,NCOLS,VOLUME,WINDOWWIDTH,WINDOWHEIGHT;
int size=256, size_P=8; 
int block=1; /* default to small blocks; calling with argument changes this */
int wander, periodic, linear, fission_allowed; 
FILE *tracefp, *datafp, *arrayfp, *tilefp;
double *strength;
double **glue;
int N, num_bindings, tileb_length;
int **tileb; double *stoic;
int hydro; int clean_cycles=1; double clean_X=1.0;
double tmax; int emax, smax;
int seed_i,seed_j,seed_n;
char *stripe_args=NULL;
int XXX=1;  /* If 1, draw the simulation, otherwise don't.  (as inferred from the effect of -nw)*/
int import=0; /* Are we importing flakes? */
int import_flake_size = 0;

struct flake_param {
  int seed_i,seed_j,seed_n,N; double Gfc; FILE *import_from;  struct flake_param *next_param;
};
struct flake_param *fparam=NULL, *fprm; 

int count_flakes(FILE *flake_file);

void parse_arg_line(char *arg)
{
        if (strncmp(arg,"block=",6)==0) 
     block=MAX(1,MIN(30,atoi(&arg[6])));
   else if (strncmp(arg,"size=",5)==0) 
     size=MAX(32,MIN(4096,atoi(&arg[5])));
   else if (strncmp(arg,"rand=",5)==0) 
     { srand48(atoi(&arg[5])); srandom(atoi(&arg[5])); }
   else if (strncmp(arg,"k=",2)==0) ratek=atof(&arg[2]);
   else if (strncmp(arg,"Gmc=",4)==0) Gmc=atof(&arg[4]);
   else if (strncmp(arg,"Gse=",4)==0) Gse=atof(&arg[4]);
   else if (strncmp(arg,"Gmch=",5)==0) {hydro=1; Gmch=atof(&arg[5]);}
   else if (strncmp(arg,"Gseh=",5)==0) {hydro=1; Gseh=atof(&arg[5]);}
   else if (strncmp(arg,"Ghyd=",5)==0) {hydro=1; Ghyd=atof(&arg[5]);}
   else if (strncmp(arg,"Gas=",4)==0) {hydro=1; Gas=atof(&arg[4]);}
   else if (strncmp(arg,"Gam=",4)==0) {hydro=1; Gam=atof(&arg[4]);}
   else if (strncmp(arg,"Gae=",4)==0) {hydro=1; Gae=atof(&arg[4]);}
   else if (strncmp(arg,"Gah=",4)==0) {hydro=1; Gah=atof(&arg[4]);}
   else if (strncmp(arg,"Gao=",4)==0) {hydro=1; Gao=atof(&arg[4]);}
   else if (strncmp(arg,"Gfc=",4)==0) {Gfc=atof(&arg[4]);}
   else if (strncmp(arg,"T=",2)==0) T=atof(&arg[2]);
   else if (strncmp(arg,"periodic",8)==0) periodic=!periodic;
   else if (strncmp(arg,"wander",6)==0) wander=!wander;
   else if (strncmp(arg,"no_fission",10)==0) fission_allowed=0;
   else if (strncmp(arg,"fission",7)==0) fission_allowed=1;
   else if (strncmp(arg,"chunk_fission",13)==0) fission_allowed=2;
   else if (strncmp(arg,"seed=",5)==0) {
      char *p=(&arg[5]);
      seed_i=atoi(p);
      if ((p=strchr(p,','))!=NULL) {
         seed_j=atoi(p+1);
         if ((p=strchr(p+1,','))!=NULL) seed_n=atoi(p+1);
      }
   }
   else if (strncmp(arg,"addflakes=",10)==0) {
      char *p=(&arg[10]);
      fprm = (struct flake_param *)malloc(sizeof(struct flake_param)); 
      fprm->seed_i=fprm->seed_j=130; fprm->seed_n=1; fprm->N=1; fprm->Gfc=0;
      fprm->import_from=NULL;
      fprm->next_param=fparam;
      fparam=fprm;
      fparam->seed_i=atoi(p);
      if ((p=strchr(p,','))!=NULL) {
         fparam->seed_j=atoi(p+1);
         if ((p=strchr(p+1,','))!=NULL) {
            fparam->seed_n=atoi(p+1);
            if ((p=strchr(p+1,':'))!=NULL) {
              fparam->N=atoi(p+1);
              if ((p=strchr(p+1,'@'))!=NULL) {
                fparam->Gfc=atof(p+1);
	      }
	    }
	 }
      }
   }
   else if (strncmp(arg,"stripe=",7)==0) 
      { stripe_args=(&arg[7]); periodic=1; wander=1; }
   else if (strcmp(arg,"-nw")==0) XXX=0;
   else if (strcmp(arg,"-linear")==0) linear=1;
   else if (strncmp(arg,"update_rate=",12)==0) 
      update_rate=MAX(1,MIN(atol(&arg[12]),10000000));
   else if (strncmp(arg,"tracefile=",10)==0) tracefp=fopen(&arg[10], "a");
   else if (strncmp(arg,"movie",5)==0) { export_mode=2; export_movie=1; }
   else if (strncmp(arg,"tmax=",5)==0) tmax=atof(&arg[5]);
   else if (strncmp(arg,"emax=",5)==0) emax=atoi(&arg[5]);
   else if (strncmp(arg,"smax=",5)==0) smax=atoi(&arg[5]);
   else if (strncmp(arg,"clean_cycles=",13)==0) clean_cycles=atoi(&arg[13]);
   else if (strncmp(arg,"clean_X=",8)==0) clean_X=atof(&arg[8]);
   else if (strncmp(arg,"datafile=",9)==0) datafp=fopen(&arg[9], "a");
   else if (strncmp(arg,"arrayfile=",10)==0) arrayfp=fopen(&arg[10], "w");
   else if (strncmp(arg,"exportfile=",11)==0) export_fp=fopen(&arg[11], "w");
   else if (strncmp(arg,"importfile",10)==0)
     {
       char *p=(&arg[11]);
       FILE *import_fp;
       import = 1;
       fprm = (struct flake_param *)malloc(sizeof(struct flake_param));
       fprm->seed_i = fprm->seed_j = 130;
       fprm->seed_n = 1;
       fprm->N = 1;
       fprm->Gfc=0;
       fprm->import_from=NULL;
       fprm->next_param = fparam;
       fparam = fprm;
       /*
	* Need to figure out seed_i and seed_j after loading in the cells.
	* Randomly choose spots from the smallest flake until we find a tile
	* that is present in each flake.
	*/
       fparam->seed_i = fparam->seed_j = size / 2;
       fparam->seed_n = 1;
       if (strncmp(arg,"importfile=",11)==0)
	 import_fp = fopen(strtok(p,"@"), "r");
       else
	 import_fp = fopen("xgrow_export_output", "r");
       /* If the file does not exist. */
       if (import_fp == NULL) 
	 {
	   fprintf(stderr, "Error: Import file not found.\n");
	   exit(-1);
	 }
       fparam->import_from = import_fp;
       if ((p = strtok(NULL, "@")) != NULL)
	 fparam->Gfc=atof(p);
       else
	 fparam->Gfc=0;
       fparam->N = count_flakes(import_fp);
     }
   else {
     fprintf(stderr,"Could not parse argument '%s'\n",arg); exit(-1);
   }
}

#define rsc read_skip_comment(tilefp)
void read_skip_comment(FILE *fp)
     // anything after a "%" gets ignored
{ int c;
 fscanf(fp," "); c=fgetc(fp); 
 while (c=='%') {
   fgets(&stringbuffer[0],256,fp); 
   // fprintf(stderr,"%%%s",stringbuffer);
   fscanf(fp," "); c=fgetc(fp); 
 }
 ungetc(c,fp); 
}

void read_tilefile(FILE *tilefp) 
{ 
 float strength_float, glue_float, stoic_float; int i,j;
 int temp_char;
 int n,m,r;

 rewind(tilefp); 
   // needs to be read twice, 
   //  once to get sim specs, field size, etc
   //  once to get colors after X window is open
 rsc;
 fscanf(tilefp,"tile edges matches {{N E S W}*}\n"); rsc;

 if (1!=fscanf(tilefp,"num tile types=%d\n",&N)) 
   { fprintf(stderr,"Reading tile file: expected num tile types.\n"); exit(-1); } 
 rsc;
 if (1!=fscanf(tilefp,"num binding types=%d\n", &num_bindings))
   { fprintf(stderr,"Reading tile file: expected num binding types.\n"); exit(-1); } 
 rsc;

 fscanf(tilefp,"tile edges="); rsc;
 tileb_length = N+1;
 tileb = (int**) calloc(sizeof(int*),tileb_length);
 stoic = (double*) calloc(sizeof(double),tileb_length);
 r=0; fscanf(tilefp,"{\n%n",&r); rsc;
 if (r!=2) { fprintf(stderr,"Reading tile file: expected tile set start {.\n"); exit(-1); }
 tileb[0] = (int*) calloc(sizeof(int),4);
 for (j=0;j<4;j++) {
   tileb[0][j] = 0;
 }
 stoic[0]=0;
 for (i=1;i<tileb_length;i++) {
   tileb[i] = (int*) calloc(sizeof(int),4);
   r=0; fscanf(tilefp,"{%n",&r); rsc; 
   if (r!=1) { fprintf(stderr,"Reading tile file: expected tile %d start def {. \n",i); exit(-1); }
   /* XXX we will need to change this too */
   /* read in the four binding types {N E S W} */
   for (j=0;j<4;j++) {
     if (1!=fscanf(tilefp,"%d",&tileb[i][j]))
       { fprintf(stderr,"Reading tile file: expected tile %d bond %d.\n",i,j); exit(-1); } 
   }
   r=0; fscanf(tilefp,"}%n",&r); rsc; 
   if (r!=1) { fprintf(stderr,"Reading tile file: expected tile %d end def }. \n",i); exit(-1); }
   if (fscanf(tilefp,"[%g]",&stoic_float)) 
     stoic[i]=stoic_float; else stoic[i]=1.0; rsc;
   if (fscanf(tilefp," (%200[^)])",&stringbuffer[0])) {
     tile_colors[i]=(char *)malloc(strlen(stringbuffer)+2);
     strcpy(tile_colors[i],stringbuffer);
   }
   fscanf(tilefp,"\n"); rsc;
 }
 r=0; fscanf(tilefp,"}%n",&r); rsc; 
 if (r!=1) { fprintf(stderr,"Reading tile file: expected tile set end }.\n"); exit(-1); }
 // printf("Tile set loaded (%d tiles)\n",N);
 // for (i=1;i<tileb_length;i++) {
 //   for (j=0;j<4;j++) printf("%d ",tileb[i][j]); printf("\n");
 // }


 glue = (double **) calloc(sizeof (double *),num_bindings + 1);
 for (i=0;i<=num_bindings;i++) { int j;
   glue[i] = (double *) calloc(sizeof (double),num_bindings + 1);
   for (j=0;j<=num_bindings;j++) { glue[i][j]=0; }  // necessary??  -- EW
 }
 strength = (double*) calloc(sizeof(double),num_bindings+1); 

 temp_char = getc (tilefp);
 ungetc(temp_char, tilefp);
 if (temp_char == 'b') {
   r=0; fscanf(tilefp,"binding strengths=%n",&r); rsc;
   if (r!=18) { fprintf(stderr,"Reading tile file: expected binding strength defs.\n"); exit(-1); }
   r=0; fscanf(tilefp,"{%n",&r); rsc;
   if (r!=1) { fprintf(stderr,"Reading tile file: expected binding strength defs {.\n"); exit(-1); }
   strength[0]=0; /* bond type 0 ("null") always has strength 0 */
   for (i=1;i<=num_bindings;i++) {
     if (1!=fscanf(tilefp,"%g",&strength_float))
       { fprintf(stderr,"Reading tile file: expected binding strength %d value.\n",i); exit(-1); }
     strength[i]=(double)strength_float;
     // printf("strength for se #%d = %g\n",i,strength[i]);
   } rsc;
   r=0; fscanf(tilefp,"}%n",&r); rsc;
   if (r!=1) { fprintf(stderr,"Reading tile file: expected binding strength defs }.\n"); exit(-1); }
 }
 while ((temp_char=fgetc(tilefp)) == 'g') {
   if (3!=fscanf(tilefp,"(%d,%d)=%g\n",&n,&m,&glue_float))
     { fprintf(stderr,"Reading tile file: expected glue def.\n"); exit(-1); } 
   rsc;
   // printf ("Glue float is g(%d,%d)=%g\n",n,m,glue_float);
   glue[n][m] = (double) glue_float;
   glue[m][n] = (double) glue_float;
 } ungetc(temp_char, tilefp); rsc;
 // printf("Bond strengths loaded (%d bond types)\n",num_bindings);
 // for (i=1;i<=num_bindings;i++) printf("%f ",strength[i]); printf("\n");
   
 rsc;
 while(fgets(&stringbuffer[0],256,tilefp)!=NULL) {
   parse_arg_line(&stringbuffer[0]); rsc;
 }

 fclose(tilefp);
}

void getargs(int argc, char **argv)
{
 int i; struct flake_param *fprm;
 struct timeval tv; 
 gettimeofday(&tv, NULL); srand48(tv.tv_usec); srandom(tv.tv_usec);

 if (sizeof(long) != 4) {
   printf("Error: sizeof long (%d) should be 4\n", (int)sizeof(long int));
   exit(-1);
 }

 if (argc==2 && strcmp(argv[1],"--")==0) {
   printf("usage: xgrow tilefile [option=#]... \n");
   printf(" tilefile is an input file that specifies tiles\n");
   printf(" options:\n");
   printf("  block=  display block size, 1...10\n");
   printf("  size=   field side length (power-of-two) [default 256]\n");
   printf("  rand=   random number seed\n");
   printf("  T=      threshold T (relative to Gse) for irreversible Tile Assembly Model\n");
   printf("  k=      hybridization rate constant (/sec)\n");
   printf("  Gmc=    initiation free energy  (units kT)\n");
   printf("  Gse=    interaction free energy per binding\n");
   printf("  Gmch=   initiation free energy  for hydrolyzed units\n");
   printf("  Gseh=   interaction free energy for hydrolyzed units\n");
   printf("  Ghyd=   free energy of hydrolysis\n");
   printf("  Gas=    activation energy for spontaneous hydrolysis\n");
   printf("  Gam=    activation energy for mismatched sticky ends\n");
   printf("  Gae=    activation energy for unmatched sticky ends\n");
   printf("  Gah=    activation energy for hydrolyzed neighbors\n");
   printf("  Gao=    delta a. e. for output vs input-triggers hydrolysis\n");
   printf("  Gfc=    log concentration of flakes (otherwise no depletion)\n");
/* printf("  anneal=g/t            anneal Gse to g with time constant t\n"); */
   printf("  seed=i,j,n            seed tile type n at position i,j\n");
   printf("  addflakes=i,j,n:N@Gfc simulate N separate flakes\n");
   printf("  stripe=o[:p,w]*       width w stripe with p errors, offset o\n");
   printf("  wander                wandering `seed' designation\n");
   printf("  fission               can tile be removed if two flakes result?\n");
   printf("  no_fission             the answer is no\n");
   printf("  chunk_fission         allow pairs & 2x2 blocks to dissociate as one (implies fission)\n");
   printf("  periodic              periodic boundary conditions\n");
   printf("  -linear               simulate linear A B tiles, write errs > stdout \n");
   printf("  -nw                   no X window (only if ?max set)\n");
   printf("  update_rate=          update display every so-many events\n");
   printf("  tracefile=            append datafile info (see below) EVERY so-many events\n");
   printf("  movie                 export MATLAB-format flake array information EVERY so-many events\n");
   printf("  tmax=                 quit after time t has passed\n");
   printf("  emax=                 quit after e events have occurred\n");
   printf("  smax=                 quit when the fragment is size s\n");
   printf("  clean_cycles=         at end, remove how many layers of weakly attached tiles?\n"
	  "                        [default=1]\n");
   printf("  clean_X=              for cleaning, minimal ratio of off-rate to on-rate [default=1.0]\n");
   printf("  datafile=             append Gmc, Gse, ratek, time, size, #mismatched se, events, perimeter, dG, dG_bonds\n");
   printf("  arrayfile=            output MATLAB-format flake array information on exit (after cleaning)\n");
   printf("  exportfile=           on-request output of MATLAB-format flake array information\n");
   printf("                        [defaults to 'xgrow_export_output']\n");
   printf("  importfile=FILENAME   import all flakes from FILENAME.\n");
   printf("  importfile            import all flakes from xgrow_export_output.\n");
   exit (0);
 }

 tmax=0; emax=0; smax=0;
 wander=0; periodic=0; linear=0; fission_allowed=0; 
 Gfc=0; datafp=NULL; arrayfp=NULL; 
 Gmc=17; Gse=8.6; ratek = 1000000.0;  T=0;
 Gmch=30; Gseh=0; Ghyd=30; Gas=30; Gam=15; Gae=30; Gah=30; Gao=10;
 seed_i=250; seed_j=250; seed_n=1; hydro=0;


 // reset tile colors that haven't been assigned
 for (i=15; i<MAXTILETYPES; i++) tile_colors[i]=NULL;
  
 if      ( (sprintf(&tileset_name[0],"%s",argv[1]),tilefp = fopen(&tileset_name[0],"r"))!=NULL ) read_tilefile(tilefp); 
 else if ( (sprintf(&tileset_name[0],"%s.tiles",argv[1]),tilefp = fopen(&tileset_name[0],"r"))!=NULL ) read_tilefile(tilefp); 
 else if ( (sprintf(&tileset_name[0],"tilesets/%s",argv[1]),tilefp = fopen(&tileset_name[0],"r"))!=NULL ) read_tilefile(tilefp); 
 else if ( (sprintf(&tileset_name[0],"tilesets/%s.tiles",argv[1]),tilefp = fopen(&tileset_name[0],"r"))!=NULL ) read_tilefile(tilefp); 
 else {
   printf("* First argument must be a tile file!\nTry 'xgrow --' for help.\n");
   exit(0);   
 }

 for (i=2; i<argc; i++) {
   parse_arg_line(argv[i]);
 }
 if (tmax==0 && emax==0 && smax==0) XXX=1;
 if (hydro && fission_allowed==2) fission_allowed=1;

 for (size_P=5; (1<<size_P)<size; size_P++);
 size=(1<<size_P); 
 if (XXX) {
   if (size*block > 800) block=800/size;
   if (block==0) { size=512; block=1; size_P=9; }
 }

 NROWS=(size+NBDY*2);
 NCOLS=(size+NBDY*2);
 VOLUME=(NROWS*NCOLS);
 WINDOWWIDTH=(MAX(block*NCOLS,256)+PLAYLEFT+BOUNDWIDTH+20);
 WINDOWHEIGHT=(PLAYTOP+MAX(block*NROWS,256)+10);

 T=T*Gse;

 /* for consistency's sake, insert seed_i, seed_j, seed_n, Gfc into fparam */
 /* if no addflake commands were issued */
 if (fparam==NULL) {
   fprm = (struct flake_param *)malloc(sizeof(struct flake_param)); 
   fprm->seed_i=seed_i; fprm->seed_j=seed_j; fprm->seed_n=seed_n; 
   fprm->import_from=NULL;
   fprm->N=1; fprm->Gfc=Gfc;
   fprm->next_param=fparam;
   fparam=fprm;
 }

 // make sure all seed tiles are on the board
 for (fprm=fparam; fprm!=NULL; fprm=fprm->next_param) {
    while (fprm->seed_i>=size) fprm->seed_i/=2;
    while (fprm->seed_j>=size) fprm->seed_j/=2;
 }
 seed_i=fparam->seed_i; seed_j=fparam->seed_j;

 if (!XXX) {
   printf(" Starting simulation (1st seed=%d,%d,%d) on %d x %d board.\n",
	  seed_i, seed_j, seed_n, size, size);
 }
 
}

void write_datalines(FILE *out, char *text)
{ flake *fpp; int perimeter; double dG_bonds;  
 
 for (fpp=tp->flake_list; fpp!=NULL; fpp=fpp->next_flake) {
   if (strcmp(text,"")==0) fpp=fp;
   perimeter=calc_perimeter(fpp);
   dG_bonds = calc_dG_bonds(fpp);
   if (tp->hydro) fprintf(datafp, " %f %f %f %f %f %f %f %f %f ",
			  Gseh, Gmch, Ghyd, Gas, Gam, Gae, Gah, Gao, Gfc);
   fprintf(out, " %f %f %f %f %d %d %ld %d %f %f%s",
	   Gmc,Gse,ratek,tp->t,fpp->tiles,fpp->mismatches,tp->events,
	   perimeter, fpp->G, dG_bonds,text);
   if (strcmp(text,"")==0) break;
 }
}


void write_flake(FILE *filep, char *mode, flake *fp)
{ int n, row, col, tl; 

  if (filep!=NULL) {
     if (strcmp(mode,"flake")==0) n=export_flake_n++;
     else if (strcmp(mode,"movie")==0) n=export_movie_n++;
     else n=1;
     fprintf(filep,"\n%s{%d}={ ...\n",mode,n);
     fprintf(filep,"[ "); write_datalines(filep,"");
     fprintf(filep," ],...\n  [");
     for (tl=1; tl<=tp->N; tl++) 
       fprintf(filep," %8.5f", (tp->conc[tl]>0)?-log(tp->conc[tl]):0 );
     fprintf(filep," ],...\n  [");
     for (row=0; row<size; row++) {
        for (col=0; col<size; col++)
           fprintf(filep, " %d", fp->Cell(row,col));
        fprintf(filep, "; ...\n");
     }
     fprintf(filep," ] };\n\n");
  }
}  

void export_flake(char *mode, flake *fp)
{
  if (export_fp==NULL) export_fp=fopen("xgrow_export_output","a+");
  write_flake(export_fp, mode, fp);
}


/*
 * Count the number of flakes in an exported file.
 * Doesn't actually count the number of flakes, it just watches
 * the flake number and returns the last one it finds.
 */
int count_flakes(FILE *flake_file)
{
  int n, i, flake_size, row, garbage, end;
  /*
   * This assumes the parameters (which we want to ignore)
   * are less than 20 charaters long (Overkill.  14 should be enough)
   */
  char line[20]; 
  flake_size = 0;

  /* Run through once to make sure the flakes are the right size. */
  
  fscanf(flake_file, "\nflake{%d}={ ...\n[", &n);

  /* For debugging */
/*    printf("flake number: %d\n", n); */

  /* Run through the parameters, waiting for ],... to appear twice. */
  for(i = 0; i < 2; i++)
    {
      while (1)
	{
	  fscanf(flake_file, "%s", line);
	  if (strcmp(line, "],...")==0)
	    break;
	}
    }
  
  /* Read in the '[' */
  fscanf(flake_file, "%s", line);

  while (1)
    {
      fscanf(flake_file, "%s", line);
      /*      printf("Just read in loop: %s\n", line); */
      if (strcmp(line, "...")==0) /* then we've reached the end of the line */
	{
	  break;
	}
      else
	flake_size++;
    }
  
  if (flake_size > import_flake_size)
    import_flake_size = flake_size;
  
  /*
   * Now finish processing the first flake.
   */

  for(row = 2; row <= flake_size; row++)
    {
/*        fprintf(stderr, "Now on row: %d\n", row); */
      for(i = 0; i <= flake_size; i++)
	{
	  fscanf(flake_file, "%d", &garbage);
	  /*	  fprintf(stderr, "%d:%d ", i, garbage); */
	}
      fscanf(flake_file, "%s", line);
      /* Make sure that we've actually read the end of line. */
      if(strcmp(";", line) != 0)
	{
	  fprintf(stderr, "Error parsing input file. Expected ';' but read '%s'\n", line);
	  exit(-1);
	}
      fscanf(flake_file, "%s", line);
      if(strcmp("...", line) != 0)
	{
	  fprintf(stderr, "Error parsing input file. Expected '...' but read '%s'\n", line);
	  exit(-1);
	}
    }
  
  row--; /* stupid off by one things. */

  if(row != flake_size)
    {
      fprintf(stderr, "Error: Flake dimensions do not match.\n%d rows and "
	      "%d columns\n", row, flake_size);
      exit(-1);
    }
  
  fscanf(flake_file, "%s", line);
  assert(strcmp(line, "]")==0);
  fscanf(flake_file, "%s", line);
  assert(strcmp(line, "};")==0);
    
  /* Watch for end of file as well as find the next flake number. */
  end = fscanf(flake_file, "\nflake{%d}={ ...\n[", &n);
  
  /* Now go through the rest of the file. */
  while (end)
    {
      /* For debugging */
/*        printf("Flake number: %d\n", n); */
      
      /* Run through the parameters, waiting for ],... to appear twice. */
      for(i = 0; i < 2; i++)
	{
	  while (1)
	    {
	      fscanf(flake_file, "%s", line);
	      if (strcmp(line, "],...")==0)
		break;
	    }
	}
      
      fscanf(flake_file, "%s", line);
      assert(strcmp(line, "[")==0);
      for(row = 1; row <= flake_size; row++)
	{
	  for(i = 0; i < flake_size; i++)
	    {
	      fscanf(flake_file, "%s", line);
	    }
	  fscanf(flake_file, "%s", line);
	  assert(strcmp("...", line)==0);
	} 
      
      fscanf(flake_file, "%s", line);
      assert(strcmp("]", line)==0);
      fscanf(flake_file, "%s", line);
      assert(strcmp("};", line)==0);

      /* Watch for end of file as well as find the next flake number. */
      end = fscanf(flake_file, "\nflake{%d}={ ...\n[", &n);
    } /* end while */

  fprintf(stderr, "Found %d flakes\n", n);
  
  return n;
}


/* Import flakes */
/*
 * Import flake data for flake n from the file and store it into
 * flake fp, then recalc_g at the end.  If there is no corresponding flake
 * in the file, it doesn't modify the flake.
 */
void import_flake(flake *current_flake, FILE *flake_file, int flake_number)
{
  fpos_t flake_start;
  int tile_type, read_flake_number, translate, i, j, end, flake_size, seed_set;
  char line[20];
  seed_set = flake_size = 0;
  
  /* Just to be sure. */
  rewind(flake_file);

  /* Find the flake we want. */
  fscanf(flake_file, "\nflake{%d}={ ...\n[", &read_flake_number);

  while (read_flake_number!=flake_number)
    {
      /* Skip through the parameters, waiting for ],... to appear twice. */
      for(i = 0; i < 2; i++)
	{
	  while (1)
	    {
	      /* Assumes the parameters are terminated by '],...' */
	      if (fscanf(flake_file, "%s", line)==0)
		{
		  fprintf(stderr,"Error: Expected ],... at end of parameters.\n");
		  exit(-1);
		}
	      if (strcmp(line, "],...")==0)
		break;
	    }
	}
      
      /* Skip through the data for this flake */
      while(1)
	{
	  if (fscanf(flake_file, "%s", line)==0)
	    {
	      fprintf(stderr,"Error: Expected }; at end of data.");
	      exit(-1);
	    }
	  if (strcmp(line, "};")==0)
	    break;
	}
      
      end = fscanf(flake_file, "\n\nflake{%d}={", &read_flake_number);

      if (!end)
	{
	  fprintf(stderr, "Flake %d not found in file.\n", flake_number);
	  return;
	}
    }

  /* Skip through the parameters, waiting for ],... to appear twice. */
  for(i = 0; i < 2; i++)
    {
      while (1)
	{
	  fscanf(flake_file, "%s", line);
	  if (strcmp(line, "],...")==0)
	    break;
	}
    }
  /* Read in the starting '[' */
  fscanf(flake_file, "%s", line);
  assert(strcmp("[", line)==0);

  /*
   * Save the current position in the file stream so that we can
   * import data values after calculating the size of the import
   * flake.
   */
  fgetpos(flake_file, &flake_start);

  /* Find the width of the flake. */
  while (1)
    {
      fscanf(flake_file, "%s", line);
      if (strcmp(line, "...")==0)
	  break;
      else
	  flake_size++;
    }
  
  /* Go back to the starting point. */
  fsetpos(flake_file, &flake_start);

  /*
   * We want to import the flake into the middle of the empty flake, so
   * calculate how much we need to translate every cell by.
   */
  translate = (size - flake_size) / 2;
  
  for (i = 0; i < flake_size; i++)
    {
      for (j = 0; j < (flake_size - 1); j++)
	{
	  fscanf(flake_file, "%d", &tile_type);
	  change_cell(current_flake, translate + i, translate + j, tile_type);
	}
      fscanf(flake_file, "%d;", &tile_type);
      change_cell(current_flake, translate + i, translate + j, tile_type);

      fscanf(flake_file, "%s", line);
      assert(strcmp(line, "...")==0);
    }

  /* Now choose a random active cell and set it as the flake's seed. */
  srand(time(0));
  i = flake_size * (((double)rand()) / ((double)RAND_MAX)) + translate;
  j = flake_size * (((double)rand()) / ((double)RAND_MAX)) + translate;
  while ((current_flake->Cell(i,j)) == 0)
    {
      i = flake_size * (((double)rand()) / ((double)RAND_MAX)) + translate;
      j = flake_size * (((double)rand()) / ((double)RAND_MAX)) + translate;
    }
  current_flake->seed_i = i;
  current_flake->seed_j = j;
  current_flake->seed_n = current_flake->Cell(i,j);
  
/*    fprintf(stderr, "Just set seed for flake %d to (%d,%d), tile type %d\n", flake_number, i, j, current_flake->Cell(i,j)); */
  
  recalc_G(fp);
}


void closeargs()
{ 
  int i;  flake *fpp;

  // cleans all flakes  (removes "temporary" tiles on growth edge)
  for (fpp=tp->flake_list; fpp!=NULL; fpp=fpp->next_flake) 
    clean_flake(fpp,clean_X,clean_cycles); 

  /* output information for *all* flakes */
  if (datafp!=NULL) {
    write_datalines(datafp,"\n"); fclose(datafp);
  } 
  if (arrayfp!=NULL) {
    export_flake_n=1;
    for (fpp=tp->flake_list; fpp!=NULL; fpp=fpp->next_flake) {
      write_flake(arrayfp, "flake", fpp);
     }
    fclose(arrayfp);
  }
  if (export_fp!=NULL) fclose(export_fp);

  // free memory
  for (i=0;i<=tp->N;i++) free(tileb[i]); free(tileb);
  for (i=0;i<=tp->N;i++) free(glue[i]); free(glue);
  free(strength); free(stoic);
  
  while (fparam!=NULL) { fprm=fparam->next_param; free(fparam); fparam=fprm; }

  free_tube(tp);  // this frees all the flakes too
}

// (i,j) should not be empty. returns 0 if OK, 1 if mismatches with E or S or N or W, or unbound s.e.
#define errortile(i,j) (                                                    \
         (tileb[fp->Cell(i,j)][1] != tileb[fp->Cell(i,(j)+1)][3] ||         \
          tileb[fp->Cell(i,j)][3] != tileb[fp->Cell(i,(j)-1)][1] ||         \
          tileb[fp->Cell(i,j)][0] != tileb[fp->Cell((i)-1,j)][2] ||         \
          tileb[fp->Cell(i,j)][2] != tileb[fp->Cell((i)+1,j)][0]) ? 1 : 0 ) \

#define getcolor(i,j) ( (fp->Cell(i,j)==0)? translate[0] : (              \
         (err==1) ? ( errortile(i,j) ? errorcolor : goodcolor ) : (       \
         (err==2) ? ( (fp->Cell(i,j)>fp->N/2) ?                           \
                      ( errortile(i,j) ? hydroerrcolor : hydrocolor ) :   \
                      ( errortile(i,j) ? errorcolor : goodcolor ) ) :     \
         translate[fp->Cell(i,j)] ) ) )

/* NOTE: requires 2^P < NCOLS+2*NBDY */
void showpic(flake *fp, int err) /* display the field */
{int row,col,i1,i2,color,j,j1,j2,blocktop=block;
 char *picture=(*spinimage).data;
 if (block>4) blocktop=block-1;  
 if (8==(*spinimage).depth) {
  if (block>1) /* I wish I knew how to do this faster */
    for (row=0;row<size;row++)
      for (col=0;col<size;col++) {
        color = getcolor(row,col);
        j=block*((col+NBDY)+block*NCOLS*(row+NBDY));
        if (color!=picture[j]) {
	  for (i1=0;i1<blocktop;i1++) {
            j1=i1*block*NCOLS+j;
            for (i2=0;i2<blocktop;i2++)
               picture[j1+i2]=color;
          }
          if (block>4 && fp->Cell(row,col)!=0) {
            for (i1=0;i1<blocktop;i1++) // col-1 side
               picture[i1*block*NCOLS+j-1]=lightcolor;
            for (i1=0;i1<blocktop;i1++) // col+1 side
               picture[i1*block*NCOLS+j+blocktop]=lightcolor;
            for (i1=0;i1<blocktop;i1++) // row+1 side
               picture[blocktop*block*NCOLS+j+i1]=lightcolor;
            for (i1=0;i1<blocktop;i1++) // row-1 side
               picture[-block*NCOLS+j+i1]=lightcolor;
	  }
          if (block>4 && fp->Cell(row,col)==0) {
            if (fp->Cell(row,col-1)==0) for (i1=0;i1<blocktop;i1++) // col-1 side
               picture[i1*block*NCOLS+j-1]=translate[0];
            if (fp->Cell(row,col+1)==0) for (i1=0;i1<blocktop;i1++) // col+1 side
               picture[i1*block*NCOLS+j+blocktop]=translate[0];
            if (fp->Cell(row+1,col)==0) for (i1=0;i1<blocktop;i1++) // row+1 side
               picture[blocktop*block*NCOLS+j+i1]=translate[0];
            if (fp->Cell(row-1,col)==0) for (i1=0;i1<blocktop;i1++) // row-1 side
               picture[-block*NCOLS+j+i1]=translate[0];
	  }
	}
      }
  else { 
     for (row=0,j=NCOLS*NBDY+NBDY;row<size;row++,j+=2*NBDY) 
       for (col=0;col<size;col++,j++)
         picture[j]=getcolor(row,col);
  }
 } else {/* depth is not == 8, use xputpixel (this is really ugly) */
  if (block>1) /* I wish I knew how to do this faster */
    for (row=0;row<size;row++)
     for (col=0;col<size;col++) {
       color=getcolor(row,col);
       if (color!=XGetPixel(spinimage,j1=block*(col+NBDY),j2=block*(row+NBDY))) {
         for (i2=0;i2<blocktop;i2++)
           for (i1=0;i1<blocktop;i1++)
            XPutPixel(spinimage,j1+i1,j2+i2,color);
          if (block>4 && fp->Cell(row,col)!=0) {
            for (i1=0;i1<blocktop;i1++) {
               XPutPixel(spinimage,j1-1,j2+i1,lightcolor); // col-1 side
               XPutPixel(spinimage,j1+blocktop,j2+i1,lightcolor); // col+1 side
               XPutPixel(spinimage,j1+i1,j2+blocktop,lightcolor); // row+1 side
               XPutPixel(spinimage,j1+i1,j2-1,lightcolor); // row-1 side
	    }
	  }
          if (block>4 && fp->Cell(row,col)==0) {
            if (fp->Cell(row,col-1)==0) for (i1=0;i1<blocktop;i1++) 
               XPutPixel(spinimage,j1-1,j2+i1,translate[0]); // col-1 side
            if (fp->Cell(row,col+1)==0) for (i1=0;i1<blocktop;i1++) 
               XPutPixel(spinimage,j1+blocktop,j2+i1,translate[0]); // col+1 side
            if (fp->Cell(row+1,col)==0) for (i1=0;i1<blocktop;i1++) 
               XPutPixel(spinimage,j1+i1,j2+blocktop,translate[0]); // row+1 side
            if (fp->Cell(row-1,col)==0) for (i1=0;i1<blocktop;i1++) 
               XPutPixel(spinimage,j1+i1,j2-1,translate[0]); // row-1 side
	  }
       }
     }
   else
    for (row=0;row<size;row++)
      for (col=0;col<size;col++) {
        color = getcolor(row,col);
        XPutPixel(spinimage,col+NBDY,row+NBDY,color);
      }
 }
 XPutImage(display,playground,gc,spinimage,0,0,0,0,block*NCOLS,block*NROWS); 
 return;
}

#define getcolordij(row,col,di,dj) \
 (((row+(di))>=0 && (row+(di))<size && (col+(dj))>=0 && (col+(dj))<size) ? \
   getcolor(row+di,col+dj) : 0)

/* NOTE: requires 2^P < NCOLS+2*NBDY */
void add_sample_pic(flake *fp, int err) /* add sample the field */
{int row,col,i1,i2,di=0,ddi,j1,j2,dj=0,ddj,blocktop=block, m;
 int color, oldcolor, n_tries=10000,n, collision=0, anything=0;
 m= 2*(err>1); // used in getcolor macro

 // we will try n_tries random offsets before giving up on 
 // avoiding collision.
 // this gets a di, dj
 XDrawImageString(display,samplebutton,gcr,0,font_height,"  SAMPLING   ",13);
 XPutImage(display,playground,gc,spinimage,0,0,0,0,block*NCOLS,block*NROWS); 

 for (n=1; n<n_tries && (collision==1 || anything==0); n++) {
   di= random()%(2*size-1) - size;
   dj= random()%(2*size-1) - size;
   //   printf("trying to place flake %d at %d %d\n", fp, di, dj);
   collision=0; anything=0;
   for (row=0;row<size;row++)
     for (col=0;col<size;col++) { 
       color = 0;
       for (ddi=-1; ddi<=1; ddi++) for (ddj=-1; ddj<=1; ddj++)
         color = MAX( getcolordij(row,col,di+ddi,dj+ddj), color ); 
       oldcolor=XGetPixel(spinimage,j1=block*(col+NBDY),j2=block*(row+NBDY));
       if (oldcolor>0 && color>0) collision=1;   
       if (getcolordij(row,col,di,dj) >0) anything++;
     }
   anything = anything && (anything==fp->tiles);
 }
 // if (n==n_tries)  printf("---GAVE UP---\n"); else printf("!!!SUCCESS!!!\n");

 if ( collision==0 ) {
    if (block>4) blocktop=block-1;  
    // always do this the slow way!
    for (row=0;row<size;row++)
     for (col=0;col<size;col++) { 
       oldcolor=XGetPixel(spinimage,j1=block*(col+NBDY),j2=block*(row+NBDY));
       color = MAX( getcolordij(row,col,di,dj), oldcolor ); 
       if (color!=oldcolor) {
         for (i2=0;i2<blocktop;i2++)
           for (i1=0;i1<blocktop;i1++)
            XPutPixel(spinimage,j1+i1,j2+i2,color);
          if (block>4) {
            for (i1=0;i1<blocktop;i1++) {
               XPutPixel(spinimage,j1-1,j2+i1,lightcolor); // col-1 side
               XPutPixel(spinimage,j1+blocktop,j2+i1,lightcolor); // col+1 side
               XPutPixel(spinimage,j1+i1,j2+blocktop,lightcolor); // row+1 side
               XPutPixel(spinimage,j1+i1,j2-1,lightcolor); // row-1 side
	    }
	  }
       }
     }
 }
 XPutImage(display,playground,gc,spinimage,0,0,0,0,block*NCOLS,block*NROWS); 
 XDrawImageString(display,samplebutton,gcr,0,font_height,"   sample    ",13);
 return;
}


/* NOTE: requires 2^P < NCOLS+2*NBDY */
void showphase() /* replace tiles by phase diagram T=1 & T=2 lines */
{int row,col,color,i1,i2,j1,j2,blocktop=block;
 if (block>4) blocktop=block-1;
    for (row=0;row<size;row++)
      for (col=0;col<size;col++) {
        color = ((size-row)/2==col || (size-row)==col) ?
                translate[7]:translate[0];
        j1=block*(col+NBDY); j2=block*(row+NBDY);
        for (i2=0;i2<blocktop;i2++)
          for (i1=0;i1<blocktop;i1++)
            XPutPixel(spinimage,j1+i1,j2+i2,color);
      }
 XPutImage(display,playground,gc,spinimage,0,0,0,0,block*NCOLS,block*NROWS); 
 return;
}


/* fix up the pause button */
void setpause(int value)
{paused=value; if (paused==0) sampling=0;
 if (paused) 
   XDrawImageString(display,pausebutton,gcr,0,font_height,"  run/PAUSE  ",13);
 else
   XDrawImageString(display,pausebutton,gcr,0,font_height,"  RUN/pause  ",13);
}

/* fix up the colors button */
void setcolor(int value)
{errorc=value;
 if (hydro) {
  if (errorc==2) 
   XDrawImageString(display,colorbutton,gcr,0,font_height,"tile/err/HYD",12);
  else if (errorc==1) 
   XDrawImageString(display,colorbutton,gcr,0,font_height,"tile/ERR/hyd",12);
  else if (errorc==0)
   XDrawImageString(display,colorbutton,gcr,0,font_height,"TILE/err/hyd",12);
 } else {
  if (errorc==1) 
   XDrawImageString(display,colorbutton,gcr,0,font_height,"  tile/ERR  ",12);
  else if (errorc==0)
   XDrawImageString(display,colorbutton,gcr,0,font_height,"  TILE/err  ",12);
 }
}

/* fix up the export button */
void setexport(int value)
{export_mode=value;
 if (export_mode==2) 
  if (export_movie==0)
   XDrawImageString(display,exportbutton,gcr,0,font_height,"export[MOVIE]",13);
  else
   switch (random()%3) {
   case 0:
   XDrawImageString(display,exportbutton,gcr,0,font_height,"ExPoRt[MOVIE]",13);
   break;
   case 1:
   XDrawImageString(display,exportbutton,gcr,0,font_height,"eXpOrT[MOVIE]",13);
   break;
   case 2:
   XDrawImageString(display,exportbutton,gcr,0,font_height,"EXPORT[MOVIE]",13);
   break;
   }
 else if (export_mode==1) 
   XDrawImageString(display,exportbutton,gcr,0,font_height,"export [ALL] ",13);
 else if (export_mode==0)
   XDrawImageString(display,exportbutton,gcr,0,font_height,"export [ONE] ",13);
}

/* fix up the seed mode button */
void setwander(int value)
{wander=value;
 if (wander) 
   XDrawImageString(display,seedbutton,gcr,0,font_height,"fixed/WANDER",12);
 else
   XDrawImageString(display,seedbutton,gcr,0,font_height,"FIXED/wander",12);
}

/* fix up the fission mode button */
void setfission(int value)
{fission_allowed=value;
 if (hydro && value==2) fission_allowed=0;
 if (fission_allowed>0) 
   if (fission_allowed==1)
     XDrawImageString(display,fissionbutton,gcr,0,font_height," fission  OK ",13);
   else
     XDrawImageString(display,fissionbutton,gcr,0,font_height,"chunk fission",13);
 else
   XDrawImageString(display,fissionbutton,gcr,0,font_height," NO  fission ",13);
}


/* this fixes the window up whenever it is uncovered */
void repaint()
{int i=0;
 XDrawString(display,quitbutton,    gcr,0,font_height,"    quit     ",13);
 XDrawString(display,restartbutton, gcr,0,font_height,"   restart   ",13);
 XDrawString(display,samplebutton,  gcr,0,font_height,"   sample    ",13);
 XDrawString(display,flakebutton,   gcr,0,font_height,"next/big/prev",13);
 XDrawString(display,tempbutton,    gcr,0,font_height," cool   heat ",13);
 setexport(export_mode);
 setpause(paused);
 setcolor(errorc);
 setwander(wander);
 setfission(fission_allowed);

 /* write various strings */
 sprintf(stringbuffer,"flake %d (%d by %d%s, seed %d @ (%d,%d)): %ld events, %d tiles, %d mismatches         ",
       fp->flake_ID, (1<<fp->P),(1<<fp->P), periodic?", periodic":"",
       fp->seed_n, fp->seed_i, fp->seed_j,
       fp->events, fp->tiles, fp->mismatches);
 XDrawImageString(display,window,gc,5,(++i)*font_height,
               stringbuffer,strlen(stringbuffer));

 sprintf(stringbuffer,"([DX] = %g uM, T = %5.3f C, 5-mer s.e.)    ",
	 1000000.0*20.0*exp(-Gmc),  4000/(Gse/5+11)-273.15);
 XDrawImageString(display,window,gc,5,(++i)*font_height,
               stringbuffer,strlen(stringbuffer));

 if (T>0) 
   sprintf(stringbuffer,"Gmc=%4.1f  Gse=%4.1f  k=%6.0f   T=%4.1f",
               Gmc,Gse,ratek,T/Gse);
 else 
   sprintf(stringbuffer,"Gmc=%4.1f  Gse=%4.1f  k=%6.0f   ",
	   Gmc,Gse,ratek);
 XDrawImageString(display,window,gc,5,(++i)*font_height,
               stringbuffer,strlen(stringbuffer));

 if (tp->hydro) {
   sprintf(stringbuffer,"Gmch=%4.1f  Gseh=%4.1f  Ghyd=%4.1f",
               Gmch,Gseh,Ghyd);
   XDrawString(display,window,gc,5,(++i)*font_height,
               stringbuffer,strlen(stringbuffer));
   sprintf(stringbuffer,"Gas=%4.1f Gam=%4.1f Gae=%4.1f Gah=%4.1f Gao=%4.1f",
               Gas,Gam,Gae,Gah,Gao);
   XDrawString(display,window,gc,5,(++i)*font_height,
               stringbuffer,strlen(stringbuffer));
 }

 sprintf(stringbuffer,"t = %12.3f sec; G = %12.3f      ",tp->t, 
       wander ? fp->G : (fp->G+log(tp->conc[fp->seed_n])));           
 XDrawImageString(display,window,gc,5,(++i)*font_height,
               stringbuffer,strlen(stringbuffer));
 sprintf(stringbuffer, "%ld events (%lda,%ldd,%ldh,%ldf), %ld tiles total %s      ",
        tp->events, tp->stat_a, tp->stat_d, tp->stat_h, tp->stat_f,
        tp->stat_a-tp->stat_d+tp->num_flakes, tp->ewrapped?"[wrapped]":"");
 XDrawImageString(display,window,gc,5,(++i)*font_height,
               stringbuffer,strlen(stringbuffer));

 if (1 || fp->flake_conc>0) { int tl;
  sprintf(stringbuffer, "Gfc=%4.1f; Gmc=[", -log(fp->flake_conc)); 
  for (tl=1; tl<=tp->N && strlen(stringbuffer)<230; tl++)
   sprintf(stringbuffer+strlen(stringbuffer)," %4.1f",
      (tp->conc[tl]>0)?-log(tp->conc[tl]):0 );
  sprintf(stringbuffer+strlen(stringbuffer)," ]");
  XDrawImageString(display,window,gc,5,(++i)*font_height,
               stringbuffer,strlen(stringbuffer));
 }

 XDrawString(display,window,gc,WINDOWWIDTH-150,WINDOWHEIGHT-65
       ," left: puncture",15); 
 XDrawString(display,window,gc,WINDOWWIDTH-150,WINDOWHEIGHT-45
       ,"middle:identify",15); 
 XDrawString(display,window,gc,WINDOWWIDTH-150,WINDOWHEIGHT-25
       ,"right: Gmc Gse ",15); 

 XDrawString(display,window,gc,WINDOWWIDTH-120,WINDOWHEIGHT-5
       ,"EW '98-'03",10); 

 if (!sampling) showpic(fp,errorc); 
 else XPutImage(display,playground,gc,spinimage,0,0,0,0,block*NCOLS,block*NROWS); 

}
 
/* a lot of this is taken from the basicwin program in the
   Xlib Programming Manual */
void openwindow(int argc, char **argv)
{char *window_name;
 char *icon_name="xgrow";
 Pixmap icon_pixmap;
 char *display_name=NULL;
 XEvent report;
 XColor xcolor,colorcell;
 Colormap cmap;
 int i,j;
# define icon_bitmap_width 16
# define icon_bitmap_height 16
 static char icon_bitmap_bits[] = {
   0x1f, 0xf8, 0x1f, 0x88, 0x1f, 0x88, 0x1f, 0x88, 0x1f, 0x88, 0x1f, 0xf8,
   0x1f, 0xf8, 0x1f, 0xf8, 0x1f, 0xf8, 0x1f, 0xf8, 0x1f, 0xf8, 0xff, 0xff,
   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

 window_name=(char *) malloc(256);
 sprintf(window_name,"xgrow: %s",tileset_name);

/* open up the display */
 if ((display=XOpenDisplay(display_name))==NULL)
  {fprintf(stderr,"%s: cannot connect to X server %s\n",
    progname,XDisplayName(display_name));
   exit(-1);
  }

 screen=DefaultScreen(display);
 depth=DefaultDepth(display,screen);
 cmap=DefaultColormap(display,screen);
    /* color? This is not the right way to do it, but .... */
 if (1==depth) 
   {fprintf(stderr,"Sorry but this program needs a color monitor.\n");
    exit(-1);
   }
 black=BlackPixel(display,screen);
 white=WhitePixel(display,screen);
 if (XAllocNamedColor(display,cmap,"firebrick",&colorcell,&xcolor))
              darkcolor=colorcell.pixel;
 if (XAllocNamedColor(display,cmap,"wheat",&colorcell,&xcolor))
              lightcolor=colorcell.pixel;
 if (XAllocNamedColor(display,cmap,"red",&colorcell,&xcolor))
              errorcolor=colorcell.pixel;
 if (XAllocNamedColor(display,cmap,"green",&colorcell,&xcolor))
              goodcolor=colorcell.pixel;
 if (XAllocNamedColor(display,cmap,"gold",&colorcell,&xcolor))
              hydrocolor=colorcell.pixel;
 if (XAllocNamedColor(display,cmap,"pink",&colorcell,&xcolor))
              hydroerrcolor=colorcell.pixel;
 if (XAllocNamedColor(display,cmap,"black",&colorcell,&xcolor))
              translate[0]=colorcell.pixel;

 for (i=1;i<MAXTILETYPES;i++) 
    if (tile_colors[i]!=NULL &&
        XAllocNamedColor(display,cmap,tile_colors[i],&colorcell,&xcolor))
              translate[i]=colorcell.pixel;
    else translate[i]=translate[(i>14) ? ((i-1)%14+1) : 0]; 

   /* make the main window */
 window=XCreateSimpleWindow(display,RootWindow(display,screen),
   0,0,WINDOWWIDTH,WINDOWHEIGHT,4,black,lightcolor);

/* make the icon */
 icon_pixmap=XCreateBitmapFromData(display,window,
   icon_bitmap_bits,icon_bitmap_width,icon_bitmap_height);

 size_hints.flags=PPosition | PSize | PMinSize;
 size_hints.min_width=WINDOWWIDTH;
 size_hints.min_height=WINDOWHEIGHT;
#ifdef X11R3
 size_hints.x=x;
 size_hints.y=y;
 size_hints.width=WINDOWWIDTH;
 size_hints.height=WINDOWHEIGHT;
 XSetStandardProperties(display,window,window_name,icon_name,
    icon_pixmap,argv,argc,&size_hints);
#else
 {XWMHints wm_hints;
  XClassHint class_hints;
  XTextProperty windowName, iconName;
  if (XStringListToTextProperty(&window_name,1,&windowName)==0)
   {fprintf(stderr,"%s: structure allocation for windowName failed.\n"
      ,progname);
    exit(-1);
   }
  if (XStringListToTextProperty(&icon_name,1,&iconName)==0)
   {fprintf(stderr,"%s: structure allocation for iconName failed.\n"
       ,progname);
    exit(-1);
   }
  wm_hints.initial_state=NormalState;
  wm_hints.input=True;
  wm_hints.icon_pixmap=icon_pixmap;
  wm_hints.flags=StateHint|IconPixmapHint|InputHint;
  class_hints.res_name=progname;
  class_hints.res_class="Basicwin";
  XSetWMProperties(display,window,&windowName,&iconName,
       argv,argc,&size_hints,&wm_hints,&class_hints);
 }
#endif

/* make the buttons */
 quitbutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-150,120,20,2,black,darkcolor);
 restartbutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-176,120,20,2,black,darkcolor);
 pausebutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-202,120,20,2,black,darkcolor);
 colorbutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-228,120,20,2,black,darkcolor);
 seedbutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-254,120,20,2,black,darkcolor);
 fissionbutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-280,120,20,2,black,darkcolor);
 tempbutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-306,120,20,2,black,darkcolor);
 flakebutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-332,120,20,2,black,darkcolor);
 samplebutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-358,120,20,2,black,darkcolor);
 exportbutton=XCreateSimpleWindow(display,window,
    WINDOWWIDTH-140,WINDOWHEIGHT-384,120,20,2,black,darkcolor);
 playground=XCreateSimpleWindow(display,window,
    PLAYLEFT,PLAYTOP,block*NCOLS,block*NROWS,2,translate[4],white);

/* pick the events to look for */
 event_mask=ExposureMask|ButtonPressMask|StructureNotifyMask;
 XSelectInput(display,window,event_mask);
 event_mask=ButtonPressMask; 
/* note that with this simple mask if one just covers a button
it will not get redrawn.  I wonder if anyone will notice?  If I put
the exposuremask in here, things flash irritatingly on being uncovered. */
 XSelectInput(display,quitbutton,event_mask);
 XSelectInput(display,pausebutton,event_mask);
 XSelectInput(display,restartbutton,event_mask);
 XSelectInput(display,colorbutton,event_mask);
 XSelectInput(display,flakebutton,event_mask);
 XSelectInput(display,seedbutton,event_mask);
 XSelectInput(display,fissionbutton,event_mask);
 XSelectInput(display,tempbutton,event_mask);
 XSelectInput(display,samplebutton,event_mask);
 XSelectInput(display,exportbutton,event_mask);
 event_mask=ButtonReleaseMask|ButtonPressMask|PointerMotionHintMask
                   |ButtonMotionMask; 
 XSelectInput(display,playground,event_mask);

/* pick font: 9x15 is supposed to almost always be there */
 if ((font=XLoadQueryFont(display,"9x15"))==NULL)
  {fprintf(stderr,"%s: Cannot open 9x15 font\n",progname);
   exit(-1);
  }
 font_height=font->ascent+font->descent;

/* make graphics contexts: 
      gc for black on white (actually, lightcolor)
      gccolor for background and buttons 
      gcr for reverse video  */
   
 gc=XCreateGC(display,window,0,NULL);
 XSetFont(display,gc,font->fid);
 XSetForeground(display,gc,black);
 XSetBackground(display,gc,lightcolor); 
 /* speed up? */
 XSetPlaneMask(display,gc,black|white|translate[0]|translate[1]|
	       translate[2]|translate[3]|translate[16]|translate[4]);

 gcr=XCreateGC(display,window,0,NULL); 
 XSetFont(display,gcr,font->fid);
 XSetForeground(display,gcr,lightcolor);
 XSetBackground(display,gcr,darkcolor);

 gccolor=XCreateGC(display,window,0,NULL); 
 XSetFont(display,gccolor,font->fid);
 XSetForeground(display,gccolor,darkcolor);
 XSetBackground(display,gccolor,lightcolor); 

/* show the window and buttons */
 XMapWindow(display,window);
 XMapWindow(display,quitbutton);
 XMapWindow(display,pausebutton);
 XMapWindow(display,restartbutton);
 XMapWindow(display,colorbutton);
 if (~(fparam->N==1 && fparam->next_param==NULL))  
   XMapWindow(display,flakebutton); 
 XMapWindow(display,seedbutton);
 XMapWindow(display,fissionbutton);
 XMapWindow(display,tempbutton);
 XMapWindow(display,samplebutton);
 XMapWindow(display,exportbutton);
 XMapWindow(display,playground);

/* make image structure */
    /* wait for playground to be displayed before proceeding */
  i=1; /* a flag */
  while (i)
     {XNextEvent(display,&report); 
      switch (report.type)
       {case Expose:
           if (report.xexpose.window!=playground) i=0;
        default:
         break;
       }
     }
 
  /* BUG: if real screen is smaller than requested display, */
  /*      then this command causes a core dump.             */
  spinimage=XGetImage((Display *) display, (Drawable) playground,
            0,0,block*NCOLS,block*NROWS,
            AllPlanes,ZPixmap);
  if (NULL==spinimage)
        {fprintf(stderr,"trouble creating image structure\n");
         exit(-1);
        } 
  /* make sure everything get written first time */
  //  for (i=0;i<block*block*VOLUME;i++) spinimage->data[i]=translate[0];

  /* make sure everything get written first time */
  for (i=0;i<block*NROWS;i++) 
    for (j=0;j<block*NCOLS;j++)
      XPutPixel(spinimage,i,j,translate[0]);


}

void cleanup()
{XUnloadFont(display,font->fid);
 XFreeGC(display,gc); 
 XFreeGC(display,gcr); 
 XFreeGC(display,gccolor); 
 XCloseDisplay(display);
 XDestroyImage(spinimage); 
 exit(1);
} 

int main(int argc, char **argv)
{unsigned int width, height;
 int x,y,b,i,j;    int clear_x=0,clear_y=0;
 int mousing=0; int stat=0;
 double new_Gse, new_Gmc;
 XEvent report;
 progname=argv[0];

 for (i=0;i<MAXTILETYPES;i++) {
   translate[i]=0; /* translate[] from tiles to colors */
 }

 getargs(argc, argv);

 if (import_flake_size > size)
   {
     fprintf(stderr, "Error: The input flake size is larger than the "
	     "simulation flake size.\n");
     exit(-1);
   }

 if (hydro) { /* automatically double the number of tiles */
   tileb=(int**) realloc(tileb,sizeof(int*)*(2*N+1));
   for (i=1;i<=N;i++) {
     tileb[i+N]= (int*) calloc(sizeof(int),4);
     for (j=0;j<4;j++) tileb[i+N][j] = tileb[i][j];
   }
   stoic=(double*) realloc(stoic,sizeof(double)*(2*N+1));
   for (i=1;i<=N;i++) stoic[i+N]= stoic[i];
   N = N*2;
 }

 if (linear) {
    linear_simulate(ratek,Gmc,Gse,tmax,emax,smax);
    return 0;
 }

 if (XXX) openwindow(argc,argv);

 /* printf("xgrow: tile set read, beginning simulation\n"); */
 
   /* set initial state */
   tp = init_tube(size_P,N,num_bindings);   
   set_params(tp,tileb,strength,glue,stoic,hydro,ratek,
          Gmc,Gse,Gmch,Gseh,Ghyd,Gas,Gam,Gae,Gah,Gao,T);

   fprm=fparam;

   /* initialize flakes */
   while (fprm!=NULL)
     {
       int fn;
       for (fn=1; fn <= fprm->N; fn++)
	 {
	   insert_flake(fp=init_flake(size_P,N,
				      fprm->seed_i,fprm->seed_j,fprm->seed_n,fprm->Gfc), tp);
	   
	   if (fprm->import_from != NULL)
	     {
  	       fprintf(stderr, "WARNING: In imported flakes, the seed position is chosen randomly.\n");
	       import_flake(fp, fprm->import_from, fn);
	     }
	 }
       fprm=fprm->next_param;
     }

   //   print_tree(tp->flake_tree,0,'*'); 
  
   if (stripe_args!=NULL) {
     /* STRIPE OPTION HAS HARDCODED TILESET NONSENSE -- A BUG */
     /* SHOULD REPLACE THIS OPTION BY READING INITIAL FLAKE FROM FILE */
      int i,j,k,w; double p; char *s=stripe_args;
      char XOR[2][2]={ {4,7}, {6,5} }; /* XOR[S][E] */ char c,cc;
      i=size-1; j = atoi(s)%size; 
      for (k=0; k<size; k++) 
         change_cell(fp, (i-k+size)%size, (j+k)%size, 4+random()%4); 
      fp->seed_i=i; fp->seed_j=j; fp->seed_n=fp->Cell(i,j);
      s = strchr(s,':');
      while (s!=NULL) {
         p = atof(s+1); s = strchr(s,',');
         if (s!=NULL) {
            w = atoi(s+1); s = strchr(s,':');
            for (;w>0;w--) {
               i=(i-1+size)%size;
               for (k=0; k<size; k++) {
                  cc=c= XOR[(fp->Cell((i-k+1+size)%size,(j+k)%size)-4)/2]
                           [(fp->Cell((i-k+size)%size,(j+k+1)%size)-4)/2];
                  if (drand48()<p) do cc=4+random()%4; while (cc==c);
                  change_cell(fp, (i-k+size)%size, (j+k)%size, cc);
                  tp->events--; /* don't count these as events */
                  /* ERROR: stats are also modified!!! */
	       }
	    }
	 }
      }
      /* no corner or boundary tiles for stripe simulations */
      tp->conc[0] -= tp->conc[1]; tp->conc[0]+=(tp->conc[1]=exp(-35));
      tp->conc[0] -= tp->conc[2]; tp->conc[0]+=(tp->conc[2]=exp(-35));
      tp->conc[0] -= tp->conc[3]; tp->conc[0]+=(tp->conc[3]=exp(-35));
   }


   // printf("flake initialized, size_P=%d, size=%d\n",size_P,size);

 new_Gse=Gse; new_Gmc=Gmc;
 if (tracefp!=NULL) write_datalines(tracefp,"\n");


 // printf("tmax=%f  emax=%d  smax=%d\n",tmax,emax,smax);

 /* loop forever, looking for events */
 while((tmax==0 || tp->t < tmax) && 
       (emax==0 || tp->events < emax) &&
       (smax==0 || tp->stat_a-tp->stat_d < smax)) { 

   if (!XXX) {
     simulate(tp,update_rate,tmax,emax,smax);
     if (tracefp!=NULL) write_datalines(tracefp,"\n");
     if (export_mode==2 && export_movie==1) export_flake("movie",fp);
   } else {
   if (0==paused && 0==mousing && !XPending(display)) {
     simulate(tp,update_rate,tmax,emax,smax);
     if (tracefp!=NULL) write_datalines(tracefp,"\n");
     if (export_mode==2 && export_movie==1) export_flake("movie",fp);
     if (fp->flake_conc>0) recalc_G(fp);
                   // make sure displayed G is accurate for conc's
                   // hopefully this won't slow things down too much.
     stat++; if (stat==1) { stat=0; repaint(); }
   }
   if (paused|mousing|XPending(display)) {
     XNextEvent(display,&report); 
     switch (report.type)
      {case Expose:
        if (report.xexpose.count!=0) break; /* more in queue, wait for them */
        repaint();  
        break;
       case ConfigureNotify:
        width=report.xconfigure.width;
        height=report.xconfigure.height;
        if ((width<size_hints.min_width)||(height<size_hints.min_height))
            {fprintf(stderr,"%s: window too small to proceed.\n",progname);
             cleanup();
            } 
        break; 
       case MotionNotify:
        if (report.xbutton.window==playground) {
               int newx,newy;
               Window root,child;
               unsigned int keys_buttons;
               int window_x,window_y;
             if (tp->hydro) break; /* don't know how to reset params */
             x=report.xbutton.x/block;
             y=report.xbutton.y/block;
             b=report.xbutton.button;
             if (mousing==0) { int i,j,t;
               i=MIN(MAX(0,y-2),size-1); j=MIN(MAX(0,x-2),size-1); t=fp->Cell(i,j);
               sprintf(stringbuffer,"([DX] = %g uM, T = %5.3f C, 5-mer s.e.)    "
                                    "tile #%d = {%d %d %d %d} at (%d,%d)           ",
                       1000000.0*20.0*exp(-Gmc),  4000/(Gse/5+11)-273.15,
		       t,tp->tileb[t][0],tp->tileb[t][1],tp->tileb[t][2],tp->tileb[t][3],i,j);
               XDrawImageString(display,window,gc,5,2*font_height,
                 stringbuffer,strlen(stringbuffer));
	     }
             if (mousing==3) {
               /* was sketch(x,y,b); now change Gse & Gmc */
               new_Gse=(30.0*x)/size; new_Gmc=30-(30.0*y)/size;
               /* draw current Gse, Gmc values */
               sprintf(stringbuffer,"Gmc=%4.1f->%4.1f  Gse=%4.1f->%4.1f",
                 Gmc,new_Gmc,Gse,new_Gse);
               XDrawImageString(display,window,gc,5,3*font_height,
                 stringbuffer,strlen(stringbuffer));
               /* this is necessary in order to get more than one MotionNotify
                  event; I don't know why. */
	     }
             if (!XQueryPointer(display,playground,
                &root,&child,&window_x,&window_y,
                &newx,&newy,&keys_buttons))
                {mousing=0; printf("Weird X feature\n"); }
	}
        break;
       case ButtonRelease:
	 if (mousing==3) { // change Gmc, Gse w/ visual GUI
           printf("Changing Gmc -> %f, Gse -> %f \n", new_Gmc, new_Gse);
           reset_params(tp, Gmc, Gse, new_Gmc, new_Gse,Gseh);
           if (Gfc>0) Gfc+=(new_Gmc-Gmc); 
           fprm=fparam;
           while (fprm!=NULL) {  /* fix up all flake info, for restarting */
              if (fprm->Gfc > 0) fprm->Gfc += (new_Gmc-Gmc); 
              fprm=fprm->next_param;
           } 
           Gse=new_Gse; Gmc=new_Gmc; 
           showpic(fp,errorc); 
	 } else if (mousing==1) {
           /* clear a region, i.e., "puncture" */
	   int i,j,mi,Mi,mj,Mj;
           x=report.xbutton.x/block;
           y=report.xbutton.y/block;
           b=report.xbutton.button; 
           if (clear_y>y) { mi=MIN(MAX(0,y-2),size-1); Mi=MIN(MAX(0,clear_y-2),size-1); }
	   else           { mi=MIN(MAX(0,clear_y-2),size-1); Mi=MIN(MAX(0,y-2),size-1); }
           if (clear_x>x) { mj=MIN(MAX(0,x-2),size-1); Mj=MIN(MAX(0,clear_x-2),size-1); }
	   else           { mj=MIN(MAX(0,clear_x-2),size-1); Mj=MIN(MAX(0,x-2),size-1); }
           if (mi != Mi && mj != Mj) { int fa=fission_allowed;
             if (mi<=fp->seed_i && fp->seed_i<=Mi &&
                 mj<=fp->seed_j && fp->seed_j<=Mj) { int si=fp->seed_i,sj=fp->seed_j;
                 // better move the seed out of the way, if possible
		 for (i=mi; i<=Mi; i++) if (fp->Cell(i,mj-1)>0) { si=i; sj=(mj-1+size)%size; }
		 for (i=mi; i<=Mi; i++) if (fp->Cell(i,Mj+1)>0) { si=i; sj=(Mj+1)%size; }
		 for (j=mj; j<=Mj; j++) if (fp->Cell(mi-1,j)>0) { si=(mi-1+size)%size; sj=j; }
		 for (j=mj; j<=Mj; j++) if (fp->Cell(Mi+1,j)>0) { si=(Mi+1)%size; sj=j; }
                 change_seed(fp,si,sj);
	     }
             fission_allowed=1; 
             for (i=mi; i<=Mi; i++)
               for (j=mj; j<=Mj; j++) {
                 if (fp->Cell(i,j)>0) { 
                     change_cell(fp, i, j, 0); flake_fission(fp,i,j); 
		 }
	       }
	     fission_allowed=fa; 
	   }
	 }
        mousing=0; 
        break;
       case ButtonPress:
        if (report.xbutton.window==quitbutton) {
            cleanup();  
        } else if (report.xbutton.window==pausebutton) {
            setpause(1-paused); repaint(); 
        } else if (report.xbutton.window==restartbutton) {
            free_tube(tp); 
            tp = init_tube(size_P,N,num_bindings);   
            set_params(tp,tileb,strength,glue,stoic,hydro,ratek,
               Gmc,Gse,Gmch,Gseh,Ghyd,Gas,Gam,Gae,Gah,Gao,T);
            fprm=fparam; 
            while (fprm!=NULL) {
               int fn;
               for (fn=0; fn<fprm->N; fn++) {
                  insert_flake(fp=init_flake(size_P,N,
                     fprm->seed_i,fprm->seed_j,fprm->seed_n,fprm->Gfc), tp); 
               }
               fprm=fprm->next_param;
            } 
            repaint();
        } else if (report.xbutton.window==colorbutton) { // show tiles or error or hyd
	  setcolor(hydro ? (errorc+1)%3 : (errorc+1)%2); repaint(); 
        } else if (report.xbutton.window==seedbutton) {
            setwander(1-wander); repaint(); 
        } else if (report.xbutton.window==fissionbutton) {
	  fission_allowed = (fission_allowed+1)%3;
            setfission(fission_allowed); 
            reset_params(tp, Gmc, Gse, new_Gmc, new_Gse,Gseh);  // this recalc's all rates
            repaint(); 
        } else if (report.xbutton.window==exportbutton) {
             x=report.xbutton.x;
             y=report.xbutton.y;
             b=report.xbutton.button;
             if (x>70) {  // change from ONE to ALL to MOVIE
               setexport((export_mode+1)%3); 
             } else if (export_mode==0) { 
               // output to file (unless MOVIE mode already)
               export_flake("flake", fp);
             } else if (export_mode==1) { 
               flake *tfp=tp->flake_list; 
               while (tfp->next_flake != NULL) {
                 export_flake("flake", tfp);
                 tfp=tfp->next_flake;
	       }
             } else if (export_mode==2) {
               // turn movie mode on & off
               export_movie= !export_movie;
	     }
             repaint();           
        } else if (report.xbutton.window==samplebutton) {
             flake *tfp; int n,num_big=0;
             x=report.xbutton.x;
             y=report.xbutton.y;
             b=report.xbutton.button;
             // stop simulation if you're sampling.
             setpause(1);  sampling=1;
             // pick a (if possible non-monomer) sample and add to the field
	     for (tfp=tp->flake_list; tfp!=NULL; tfp=tfp->next_flake) {
               if (tfp->tiles>1) num_big++;
	     } 
             n = random()%(num_big>0 ? num_big : tp->num_flakes);
             tfp=tp->flake_list;
             while (num_big>0 && tfp->tiles==1) { tfp=tfp->next_flake; } 
             for (i=0;i<n;i++) {
               tfp=tfp->next_flake;
               while (num_big>0 && tfp->tiles==1) { tfp=tfp->next_flake; } 
	     }
             add_sample_pic(tfp,errorc); 
             repaint(); 
        } else if (report.xbutton.window==flakebutton) { 
             flake *tfp=tp->flake_list; 
             x=report.xbutton.x;
             y=report.xbutton.y;
             b=report.xbutton.button; 
             // cycle through flakes.
             if (x>80) {
               fp=fp->next_flake;
               if (fp==NULL) fp=tp->flake_list;
	     } else if (x<40) {
               while (tfp->next_flake != NULL && tfp->next_flake != fp) 
                 tfp=tfp->next_flake;
	       if (tfp==NULL) fp=tp->flake_list; else fp=tfp;
	     } else {  // find the biggest flake.
               fp=tfp;
               while (tfp->next_flake != NULL) {
                 tfp=tfp->next_flake;
                 if (tfp->tiles > fp->tiles) fp=tfp; 
	       }
	     } 
	     //             print_tree(tp->flake_tree,0,'*');  
             sampling=0; repaint();
        } else if (report.xbutton.window==tempbutton) { // change Gse w/ button
             x=report.xbutton.x;  
             y=report.xbutton.y;
             b=report.xbutton.button;
             if (tp->hydro) break; /* don't know how to reset params */
             if (x>60) new_Gse=Gse-0.1; else new_Gse=Gse+0.1;
             reset_params(tp, Gmc, Gse, new_Gmc, new_Gse,Gseh);
             Gse=new_Gse; Gmc=new_Gmc; repaint();
        } else if (report.xbutton.window==playground) // we're in ButtonPress
            {x=report.xbutton.x/block;
             y=report.xbutton.y/block;
             b=report.xbutton.button;
             if (b==3) {
               if (tp->hydro) break; /* don't know how to reset params */
               new_Gse=(30.0*x)/size; new_Gmc=30-(30.0*y)/size;
               /* draw current Gse, Gmc values */
               sprintf(stringbuffer,"Gmc=%4.1f->%4.1f  Gse=%4.1f->%4.1f",
                 Gmc,new_Gmc,Gse,new_Gse);
               XDrawImageString(display,window,gc,5,3*font_height,
                 stringbuffer,strlen(stringbuffer));
               /* later: if down button, draw T=1/T=2 diagram */
               mousing=3; showphase();
	     } else if (b==1) { // "puncture"
               mousing=1; clear_x=x; clear_y=y;  /* prepare to clear a region */
	     } else if (b==2) { // "identify"
               int i,j,t;
               i=MIN(MAX(0,y-2),size-1); j=MIN(MAX(0,x-2),size-1); t=fp->Cell(i,j);
               sprintf(stringbuffer,"([DX] = %g uM, T = %5.3f C, 5-mer s.e.)    "
                                    "tile #%d = {%d %d %d %d} at (%d,%d)           ",
                       1000000.0*20.0*exp(-Gmc),  4000/(Gse/5+11)-273.15,
		       t,tp->tileb[t][0],tp->tileb[t][1],tp->tileb[t][2],tp->tileb[t][3],i,j);
               XDrawImageString(display,window,gc,5,2*font_height,
                 stringbuffer,strlen(stringbuffer));
	     }
            }
        else {
	  /*  what here ?  */
	}
        break;
       default:
        break;
      } /* end of switch */
    } /* end of if XPending */
  }} /* end of while(...) if...else */

  closeargs();
  return 0;
} /* end of main */