--- MITgcm_contrib/darwinview/src/darwin.bash	2007/07/24 16:54:05	1.3
+++ MITgcm_contrib/darwinview/src/darwin.bash	2007/08/01 18:04:31	1.4
@@ -1,120 +1,584 @@
-#!/bin/bash
+#include <GL/glut.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#define WINDOW "image"
+#define UP 101
+#define DOWN 103
+#define RIGHT 102
+#define LEFT 100
+#define MAX 700 
+#define SCALE .06
+ 
+int NX, NY, NZ;
+
+void do_byteswap_f32( float arr[], int nel ), global(), local( int, int, int );
+void readnames( char[] ), readarray( float[], char[], int ), readjet(), readxz( float[], char[] );
+void readyz( float[], char[] ), readdepths( char[] );
+void TimerFunction( int ), stroke( char[], int, int );
+
+float data[MAX][MAX*MAX], mxval, mnval, jet[64][3];
+float globalmx=0, globalmn=100;
+int win[MAX], ilev=1, howmany, sets, count=0, glo=0, usr=0, anim=0, endian=0;
+int xmax, ymax, yoffset=0, xoffset=0, yz=0, logscale=0, xz=0, nonegs=1;
+int depths[MAX], scaledepth=0, totaldepth=0, scalecount=0;
+char initfns[MAX][MAX], fns[MAX][MAX][MAX];
+
+void menu( int value ){           // called when menu is opened on right click
+
+ switch( value ){
+  case 1: usr=glo=0;            // unset glo & usr, sets local max/min
+          break;
+  case 2: glo=1;                // enables global max/min  
+          usr=0;                // unsets usr 
+          mxval=globalmx;       // sets max to globalmx
+          mnval=globalmn;       // sets min to globalmn
+          break;
+  case 3: usr=1;                // switch to user-set max/min 
+          glo=0;                // unset glo
+          printf( "Max=" );  scanf( "%f", &mxval );  // prompt user for new max
+          printf( "Min=" );  scanf( "%f", &mnval );  // prompt user for new min
+          break;
+  case 4: logscale=( logscale+1 )%2;  // switch log scale on/off
+          break;
+  case 5: nonegs=( nonegs+1 )%2;      // switch allowance of negatives on/off 
+          break;
+  case 6: endian=( endian+1 )%2;      // switch between big/little endian
+          break;
+ }
+ glutPostRedisplay();
+}
+
+void display(){                 // called on glutPostRedisplay
+ int i, j, h, ioff, q; 
+ float r, g, b, k, y;
+ double num, logmx, logmn;
+ char str[MAX]; 
+
+
+ for( q=0; q<sets; q++ ){           // runs display func for each subwindow
+  glutSetWindow( win[q] );          // sets which subwindow to display to
+  glClear( GL_COLOR_BUFFER_BIT );   // background to black
+
+  if( xz ) {  xmax=NX;  ymax=NZ;  }
+  else{
+   if( yz ){  xmax=NY;  ymax=NZ;  } 
+   else    {  xmax=NX;  ymax=NY;  } 
+  }
+
+  if( glo || usr ){                  // if global or user-set max/min 
+   if( xz )
+    readxz( data[q], fns[q][count] );
+   else{
+    if( yz )
+     readyz( data[q], fns[q][count] );
+    else
+     readarray( data[q], fns[q][count], ilev );  // read new array w/o calculating local max/min
+   }
+  }
+  else                              // if local max/min is set 
+   local( q, count, ilev );         // read new array and calculate local max/min
+
+  if( logscale ){
+   if( usr ){
+    logmx=(double)mxval;
+    logmn=(double)mnval;
+   }
+   else{
+    logmx=log10( mxval );
+    logmn=log10( mnval );
+   }
+  }
+ 
+  if( scaledepth && xz || scaledepth && yz )  ymax=totaldepth;
+  ioff=0; h=0;                        // ioff will count both i&j b/c data is 1D
+  for( j=0; j<ymax; j++ ){            // cycles through y values
+   for( i=0; i<xmax; i++ ){           // cycles through x values
+    r=g=b=0;                          // set color values to black
+    if( data[q][ioff]==0 );           // if data=0, values stay black
+    else{
+     if( logscale ){
+      num=(double)data[q][ioff];
+      num=log10( num );
+      if( num<logmn ) num=0;
+      else{
+       if( num>logmx ) num=63;
+       else
+        num=63*( num-logmn )/( logmx-logmn );
+      }
+     }
+     else{
+      if( data[q][ioff]<mnval )  num=0;   // if data is less than min, =min
+      else{
+       if( data[q][ioff]>mxval )  num=63; // if data is more than max, =max
+       else
+        num=63*( data[q][ioff]-mnval )/( mxval-mnval );  // scale num from 0-63 (not defined for 64)
+      }
+     }
+     r=jet[(int)num][0];            // set red val
+     g=jet[(int)num][1];            // set green val
+     b=jet[(int)num][2];            // set blue val  
+    }
+
+    glColor3f( r, g, b );           // put r, g, b into effect
+    if( scaledepth && xz || scaledepth && yz )
+     glRectf( i, j, i+1, j+depths[h] );
+    else
+     glRectf( i, j, i+1, j+1 );      // draws a square for data value 
+    ioff++;                    
+   } 
+   if( scaledepth && xz || scaledepth && yz ){
+    j+=depths[h]-1;
+    h++;
+   }
+  } 
+
+  glColor3f( 1, 1, 1 );             // set color to white
+  glRectf( xmax, 0, xmax+1, ymax+1 );     // draws a border
+  glRectf( 0, ymax, xmax, ymax+1 );       // draws a border  
+  for( i=0; i<64; i++ ){            // draws color bar    
+   glColor3f( jet[i][0], jet[i][1], jet[i][2]);         // sets color
+   k=(float)i;                      // turns i into a float
+   y=(float)ymax/64;                  // sets height of rectangles
+   glRectf( xmax+10, y*k, xmax+20, (k+1)*y );               // draws rectangle 
+  } 
+  glColor3f( 1, 1, 1 );             // color to white
+
+  if( logscale )
+   sprintf( str, "%.2f", logmx );
+  else
+   sprintf( str, "%.1e", mxval );    // labels color bar with max val
+  stroke( str, xmax+2, ymax-1 );
+  
+  if( logscale )
+   sprintf( str, "%.2f", logmn );
+  else
+   sprintf( str, "%.1e", mnval );    // labels color bar with min val
+  stroke( str, xmax+2, 1 );
+
+  if( xz )
+   sprintf( str, "N-S slice %d", yoffset+1);
+  else{
+   if( yz )
+    sprintf( str, "E-W slice %d", xoffset+1); 
+   else
+    sprintf( str, "Level %d", ilev ); // labels current level 
+  }
+  stroke( str, 1, ymax+5 );
+
+  sprintf( str, "Time %d", count+1 ); // labels current time 
+  stroke( str, xmax/2, ymax+5 );
+
+  if( glo )                         // labels how max/min have been set
+   sprintf( str, "Global" );        // if glo is set, display Global
+  if( usr ) 
+   sprintf( str, "User-set" );      // if usr is set, display User-set
+  if( !usr && !glo ) 
+   sprintf( str, "Local" );         // else display Local 
+  stroke( str, xmax+8, ymax+8 );
+  
+  if( anim ){                       // tell user if autoplay is on
+   sprintf( str, "Autoplay" );
+   stroke( str, xmax-35, ymax+8 );
+  }
+
+  if( logscale ){
+   sprintf( str, "Log Scale" );     // tell user if log scale is on
+   stroke( str, xmax-25, ymax+15); 
+  }
+
+  stroke( fns[q][count], 1, ymax+15 ); // labels current file
+ 
+  glutSwapBuffers();                // double buffering set to animate smoothly
+  glFlush(); 
+ }
+}
 
-echo -n "What format is the data in? (netcdf/binary): "
-read nb
+void stroke( char str[], int x, int y ){  // called to display text onscreen
+ int i;
 
-if [ $nb = 'binary' ]; then
+ glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
+ glEnable( GL_BLEND );
+ glEnable( GL_LINE_SMOOTH );
+ glMatrixMode( GL_MODELVIEW );
 
-  echo -n "Would you like to use default settings? (y/n): "
-  read yn
-
-  if [ $yn = 'n' ]; then
-
-    rm -f .darwinview/binfilenames
-    rm -f .darwinview/*.datbin
-
-    echo -n "Please enter screen resolution: "
-    read win
-    echo $win > .darwinview/binconfig
-    echo -n "Please enter dimensions of data: "
-    read dim
-    echo $dim >> .darwinview/binconfig
-    echo -n "Please enter dimensions of data sets: "
-    read dimset
-    echo $dimset >> .darwinview/binconfig
-    echo .darwinview/binfilenames >> .darwinview/binconfig
-    echo -n "Please enter directory containing data: "
-    read dir
+ glPushMatrix();
+
+ glScalef( SCALE, SCALE, SCALE );
+ glTranslatef( (1/SCALE)*x, (1/SCALE)*y, 0 );
+
+ for( i=0; i<strlen( str ); i++)    // display each character of str
+  glutStrokeCharacter( GLUT_STROKE_ROMAN, str[i] );
+
+ glPopMatrix();
+}
+
+void key( unsigned char key, int x, int y ){   // called on key press
+ int i, tmp;
+ 
+ switch(key){
+  case 'q':   exit(0);              // quits on 'q'
+              break;
+  case 'r':   count=0;              // resets back to first time    
+              ilev=1;               // and first level
+              break;
+  case 'a':   anim=(anim+1)%2;      // turns anim on/off
+              break;
+  case 'x':   xz=(xz+1)%2;
+              yz=0;
+              break;
+  case 'y':   yz=(yz+1)%2;
+              xz=0;
+              break;
+  case 'z':   if( xz || yz ){
+               scaledepth=( scaledepth+1 )%2;
+               scalecount++;
+               if( scalecount==1 ) 
+                readdepths( ".darwinview/depths" );
+              }
+              break; 
+ } 
+ glutPostRedisplay();
+}
+
+void TimerFunction( int value ){    // called when anim is set and arrow key is pressed
+ int i;
+
+ switch(value){                     // increments in the correct direction
+  case DOWN : if( xz && yoffset>0 )
+               yoffset--;
+              else{
+               if( yz && xoffset<NX-1 )
+                xoffset++;
+               else 
+                if( ilev<NZ && !xz && !yz ) 
+                 ilev++;              // if down arrow pressed, move down a level      
+              }
+              break;
+  case UP   : if( xz && yoffset<NY-1 )
+               yoffset++;
+              else{
+               if( yz && xoffset>0 )
+                xoffset--; 
+               else
+                if( ilev>1 && !xz && !yz )    
+                 ilev--;              // if up arrow is pressed, move up a level
+              }
+              break;
+  case LEFT : if( count>0 )      
+               count--;             // if left arrow is pressed, move back one time step 
+              break;
+  case RIGHT: if( count<howmany-1 )
+               count++;             // if right arrow is pressed, moves forward one time step 
+              break;
+ }
+ 
+ glutPostRedisplay();            
+
+ if ( anim )
+  switch( value ){    
+   case DOWN : if( xz && yoffset==0 )
+                yoffset=NY-1;
+               else{ 
+                if( yz && xoffset==NX-1 )
+                 xoffset=0;
+                else
+                 if( ilev==NZ && !xz && !yz )
+                  ilev=1;                   // if end reached, restart 
+               }
+               glutTimerFunc( 100, TimerFunction, value ); // recalls itself
+               break;
+   case UP   : if( xz && yoffset==NY-1 )
+                yoffset=0;
+               else{
+                if( yz && xoffset==0 )
+                 xoffset=NX-1;
+                else
+                 if( ilev==1 )
+                  ilev=NZ;                   // if end reached, restart 
+               }
+               glutTimerFunc( 100, TimerFunction, value ); // recalls itself 
+               break;
+   case LEFT : if( count==0 ) count=howmany-1;             // if end reached, restart 
+               glutTimerFunc( 100, TimerFunction, value ); // recalls itself
+               break;
+   case RIGHT: if( count==howmany-1 ) count=0;             // if end reached, restart                 
+               glutTimerFunc( 100, TimerFunction, value ); // recalls itself
+               break;
+  } 
+}
+
+void specialkey( int key, int x, int y ){
+ int i;
+
+ if( anim )                       // if animation is set, call the timer function
+  glutTimerFunc( 100, TimerFunction, key);             // to scroll automatically
+
+ switch(key){
+  case DOWN   :  if( xz && yoffset>0 ) 
+                  yoffset--;
+                 else{ 
+                  if( yz && xoffset<NY-1 )
+                   xoffset++;
+                  else
+                   if( ilev<NZ && !xz && !yz )      // if you haven't reached the bottom
+                    ilev++;              // keep going down
+                 } 
+                 break;
+  case UP     :  if( xz && yoffset<NY-1 )
+                  yoffset++;
+                 else{
+                  if( yz && xoffset>0 )
+                   xoffset--;
+                  else
+                   if( ilev>1 )          // if you haven't reached the top
+                    ilev--;              // keep going up
+                 }
+                 break;
+  case RIGHT  :  if( count<howmany-1 ) // if you haven't reached the last file
+                  count++;             // keep going right
+                 break;
+  case LEFT   :  if( count>0 )         // if you haven't reached the first file
+                  count--;             // keep going left
+                 break;
+ }
+ glutPostRedisplay();            
+}
+
+void global(){                         // calculates the max/min for the total data set
+ FILE* fp;
+ int h, i, j;
+ for( h=0; h<sets; h++)                // cycles through each window 
+  for( i=0; i<howmany; i++ )           // cycles through each time 
+   for( j=0; j<NZ; j++ ){              // cycles through each level for each file
+    local( h, i, j );                  // calculates local max/min for specific data set 
+    if( mxval > globalmx ) globalmx = mxval;   // sets highest value to globalmx
+    if( mnval < globalmn ) globalmn = mnval;   // sets lowest value to globalmn
+   }
+}
+
+void local( int i, int time, int lev ){        // calculates local max/min
+ int j;
+ 
+ mxval=0;  
+ mnval=100;
+ if( xz )
+  readxz( data[i], fns[i][time]);
+ else{
+  if( yz )
+   readyz( data[i], fns[i][time]);
+  else
+   readarray( data[i], fns[i][time], lev );      // read new array of data
+ }
+ for( j=0; j<xmax*ymax; j++ ){
+  if( data[i][j] > mxval ) 
+   mxval=data[i][j];                           // set largest val to mxval 
+  if( data[i][j] < mnval && data[i][j]!=0 ) 
+   mnval=data[i][j];                           // set smallest positive val to mnval 
+ }
+}
+
+void readnames( char filename[] ){             // reads in list of filenames 
+ FILE* fp;
+ int i=0, j=0;
+ 
+ fp=fopen( filename, "r" );                    // opens list of filenames
+ while( !feof(fp) ){                           // reads until the end of the file 
+  fscanf( fp, "%s", initfns[i] );              // places filename into an array of strings 
+  i++;                                         // counts how many filenames there are  
+ } 
+ fclose( fp );                                 // close file
+ sets=i-1;                                  // saves number of initial filenames 
+ 
+ for(i=0; i<sets; i++){                     // goes through each read-in filename 
+  fp=fopen( initfns[i], "r" );                 // opens each filename  
+  j=0;
+  while( !feof(fp) ){                          // reads in filenames from each filename 
+   fscanf( fp, "%s", fns[i][j]);               
+   j++;
+  }
+  fclose(fp);                                  // close file
+ }
+ howmany=j-1;                                  // saves number of data filenames  
+}
+
+void readdepths( char filename[] ){
+ int i;
+ FILE* fp;
+
+ fp=fopen( filename, "r" );
+
+ for( i=NZ-1; i>=0; i-- ){
+  fscanf( fp, "%d ", &depths[i] );
+  totaldepth+=depths[i];
+ } 
+
+ fclose( fp );
+}
+
+void readjet(){               //reads in color scale values
+ FILE* fp;
+ int i, j; 
   
-    echo -n "Please enter name of file containing desired species: "
-    read fn 
+ fp=fopen( ".darwinview/jet.h", "r" );  // opens file containing values
+ for( i=0; i<64; i++ )        // reads in 64 sets of r, g, b values
+  for( j=0; j<3; j++ )
+   fscanf( fp, "%f", &jet[i][j] );
+ fclose( fp );                // closes file
+}
+
+void readxz( float arr[], char filename[] ){
+ int i, j;
+ float tmp[MAX][MAX], tmp2[MAX*MAX];
+ FILE* fp;
+ 
+ fp=fopen( filename, "rb" );   
+ for( i=0; i<NZ; i++){
+  fseek( fp, (NX*yoffset*4)+(i*NX*NY*4), SEEK_SET );
+  fread( &arr[NX*i], sizeof( arr[0] ), NX, fp );  // reads in data to fill one level 
+ }
+ fclose( fp );
+
+ for( i=0; i<NZ; i++ )
+  for( j=0; j<NX; j++)
+   tmp[i][j]=arr[i*NX+j];
+
+ for( i=0; i<NZ; i++ )
+  for( j=0; j<NX; j++)
+   tmp2[i*NX+j]=tmp[NZ-i-1][j];
+
+ for( i=0; i<NX*NZ; i++)
+  arr[i]=tmp2[i];
+}
+
+void readyz( float arr[], char filename[] ){
+ int i, j;
+ float tmp[MAX][MAX], tmp2[MAX*MAX];
+ FILE* fp;  
+ 
+ fp=fopen( filename, "rb" );
+ for( i=0; i<NY*NZ; i++ ){
+  fseek( fp, (xoffset*4)+(i*NX*4), SEEK_SET ); 
+  fread( &arr[i], sizeof( arr[0] ), 1, fp );
+ }
+ fclose(fp);
+
+ for( i=0; i<NZ; i++ )
+  for( j=0; j<NY; j++)
+   tmp[i][j]=arr[i*NY+j];
+
+ for( i=0; i<NZ; i++ )
+  for( j=0; j<NY; j++)
+   tmp2[i*NY+j]=tmp[NZ-i-1][j];
+
+ for( i=0; i<NY*NZ; i++)
+  arr[i]=tmp2[i];
+}
+
+void readarray( float arr[], char filename[], int il ){   // reads new data
+ FILE* fp;
+ int i;
+ 
+ fp=fopen( filename, "rb" );                 // opens the file containing data
+ fseek( fp, (il-1)*NX*NY*4, SEEK_SET );      // seeks to the correct place using ilev
+ fread( arr, sizeof( arr[0] ), NX*NY, fp );  // reads in data to fill one level 
+ fclose( fp );                               // close file
+
+ if( nonegs ) 
+  for( i=0; i<NX*NY; i++ )                    
+   if( arr[i] < 0 ) 
+    arr[i] = pow(10, -20);   // sets negative values to 10^-20 
+
+ if( endian )
+  do_byteswap_f32( arr, NX*NY );            // switches endian 
+}
+
+void do_byteswap_f32( float arr[], int nel ){ // switches endian
+
+ int i;
+ char src[4], trg[4];
+
+ for( i=0; i<nel; i++ ){
+  memcpy( src, &(arr[i]), 4 );
+  trg[0]=src[3];
+  trg[1]=src[2];
+  trg[2]=src[1];
+  trg[3]=src[0];
+  memcpy( &(arr[i]), trg, 4 );
+ }
+}
+
+void black( ){
+ glClear( GL_COLOR_BUFFER_BIT );
+ glutSwapBuffers();
+ glFlush();
+}
+
+
+int main( int argc, char *argv[] ){
+ int i, setsx, setsy, tmpx, tmpy, winx, winy, parent;
+ char str[MAX], filename[MAX];
+ FILE* fp;
+
+ if( strcmp(argv[1], "binary") == 0 )
+  fp=fopen( ".darwinview/binconfig", "r" );
+ else
+  if( strcmp(argv[1],"netcdf") == 0 )
+   fp=fopen( ".darwinview/ncconfig", "r" );
+
+ fscanf( fp, "%dx%d ", &winx, &winy ); 
+ winy-=60;  winx-=20;                     // adjusts resolution so edges won't get cut off             
+ fscanf( fp, "%d %d %d ", &NX, &NY, &NZ );
+ fscanf( fp, "%dx%d ", &setsx, &setsy );                // prompts user for dimensions of subwindows
+ fscanf( fp, "%s", filename );
+
+ fclose( fp );
+
+ xmax=NX; ymax=NY;
+ 
+ readjet();                               // stores color values
+ readnames( filename );                   // gets list of filenames to read from
+ global();                                // calculates max and min for all data
+
+ glutInit( &argc, argv );                 
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );   // sets rgb mode and double buffering
+ glutInitWindowSize( winx, winy );                // parent window will cover screen
+ glutInitWindowPosition( 10, 10 );                // location of parent window
+ parent=glutCreateWindow( WINDOW );               // creates parent window
+
+ glClearColor( 0, 0, 0, 0 );                      // sets clear color to black
+ gluOrtho2D( 0, winx , winy, 0 );                 // sets(0,0) as top left corner 
+ glutDisplayFunc( display );
+ glutKeyboardFunc( key );                         // called on key press
+ glutSpecialFunc( specialkey );                   // called on special key press (arrow keys)
  
-    vn=( `cat $fn` ) 
 
-    for name in ${vn[@]}; do
-      touch .darwinview/$name.datbin
-      echo .darwinview/$name.datbin >> .darwinview/binfilenames 
-      for i in `ls $dir`; do
-        echo $dir/$i/`ls $dir/$i | grep $name` >> .darwinview/$name.datbin
-      done
-    done
-
-  fi
-
-elif [ $nb = 'netcdf' ]; then
-
-  echo -n "Would you like to use default settings? (y/n): "
-  read yn
- 
-  if [ $yn = 'n' ]; then
-
-    rm -f .darwinview/ncfilenames
-    rm -f .darwinview/*.datnc
-
-    echo -n "Please enter screen resolution: "
-    read win
-    echo $win > .darwinview/ncconfig
-    echo -n "Please enter dimensions of data: "
-    read dim
-    echo $dim >> .darwinview/ncconfig
-    echo -n "Please enter dimensions of data sets: "
-    read dimset
-    echo $dimset >> .darwinview/ncconfig
-    echo .darwinview/ncfilenames >> .darwinview/ncconfig
-
-    echo -n "Please enter directory containing data: "
-    read tmp 
-    echo $tmp > .darwinview/netcdf
-    echo -n "Please enter directory to write to: "
-    read tmp 
-    echo $tmp >> .darwinview/netcdf
-
-    echo -n "Please enter name of file containing desired species: "
-    read tmp 
-    echo $tmp >> .darwinview/netcdf
-    echo -n "Please enter name of file containing desired tiles: "
-    read tmp 
-    echo $tmp >> .darwinview/netcdf
-    echo -n "Please enter name of file containing desired time steps: "
-    read tmp
-    echo $tmp >> .darwinview/netcdf
-
-  fi
-
-  indir=( `cat .darwinview/netcdf | head -1` )
-  outdir=( `cat .darwinview/netcdf | head -2 | tail -1` )
-  fn=( `cat .darwinview/netcdf | head -3 | tail -1` )
-  vn=( `cat $fn` )
-  fn=( `cat .darwinview/netcdf | head -4 | tail -1` )
-  tlist=( `cat $fn` )
-  fn=( `cat .darwinview/netcdf | tail -1` )
-  itlist=( `cat $fn` )
-
-  initdir=`pwd`
-  gcc ~/netcdf.c -I/usr/include/netcdf-3 -L/usr/lib/netcdf-3 -lnetcdf
-  for tstep in ${itlist[@]}; do 
-    cd $initdir
-    cd $outdir
-    mkdir -p $tstep
-    cd $tstep
-    for name in ${vn[@]}; do
-      for tile in ${tlist[@]}; do
-        /home/marissa/a.out ~/${indir}/ptr_tave.${tstep}.${tile}.nc $name
-      done
-    done
-  done
-
-  cd $initdir
-
-  for name in ${vn[@]}; do
-    touch .darwinview/$name.datnc
-    echo .darwinview/$name.datnc >> .darwinview/ncfilenames 
-    for i in `ls $outdir`; do
-      echo $outdir/$i/`ls $outdir/$i | grep $name` >> .darwinview/$name.datnc
-    done
-  done
+ for( i=0; i<setsx*setsy; i++ ){
+  tmpx = (i%setsx)*(winx/setsx);                  // x coordinate of top left corner of subwindow
+  tmpy = (i/setsx)*(winy/setsy);                  // y coordinate of top left corner of subwindow 
+
+  win[i]=glutCreateSubWindow( parent, tmpx, tmpy, winx/setsx, winy/setsy ); // creates subwindow
+  gluOrtho2D( 0, NX+35, 0, NY+25 );               // sets how data is mapped to subwindow
+  glutKeyboardFunc( key );                        // called on key press
+  glutSpecialFunc( specialkey );                  // called on special key press (arrow keys)
+  if( i >= sets )                                 // 
+   glutDisplayFunc( black );
+  else
+   glutDisplayFunc( display );                     // sets display func for subwindow
+  
 
-fi
+  glutCreateMenu( menu );                                // adds a menu
+   glutAddMenuEntry( "Local Color Scale", 1 );           // adds a menu entry 
+   glutAddMenuEntry( "Global Color Scale", 2 );          // adds a menu entry 
+   glutAddMenuEntry( "User-Set Color Scale", 3 );        // adds a menu entry 
+   glutAddMenuEntry( "Log Scale (on/off)", 4 );          // adds a menu entry 
+   glutAddMenuEntry( "Allow Negatives (on/off)", 5 );    // adds a menu entry
+   glutAddMenuEntry( "Switch Endian (big/little) ", 6);  // adds a menu entry
+  glutAttachMenu( GLUT_RIGHT_BUTTON );                   // menu called on right click
+ }
+
+ glutMainLoop();                                  // begin processing events
+ return 0;
+}
 
-gcc darwin.c -lglut
-./a.out $nb