--- MITgcm_contrib/darwinview/src/darwin.c	2007/07/12 18:30:19	1.2
+++ MITgcm_contrib/darwinview/src/darwin.c	2007/08/03 14:37:15	1.8
@@ -8,54 +8,75 @@
 #define DOWN 103
 #define RIGHT 102
 #define LEFT 100
-#define MAX 200
+#define MAX 700 
+#define SCALE .06
  
-int NX, NY, MAXNZ, setsx, setsy;
+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();
-void TimerFunction( int ), bitmap( char[], 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[MAX][MAX];
+float data[MAX][MAX*MAX], mxval, mnval, jet[64][3];
 float globalmx=0, globalmn=100;
-int win[MAX], ilev=1, howmany, count=0, glo=0, usr=0, anim=0, logscale=0;
+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
+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
-          glutPostRedisplay();  // recall display func with new values 
           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
-          glutPostRedisplay();  // recall display func with new values
           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
-          glutPostRedisplay();                       // recall display func with new values
           break;
-  case 4: logscale=(logscale+1)%2;  // switch log scale on/off
-          glutPostRedisplay();
+  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(void){                 // called on glutPostRedisplay
- int i, j, ioff, q; 
- float r, g, b, k, y;
+void display(){                 // called on glutPostRedisplay
+ int i, h, ioff, q; 
+ float r, g, b, k, y, j, tmp;
  double num, logmx, logmn;
  char str[MAX]; 
 
- for( q=0; q<setsx*setsy; q++ ){    // runs display func for each subwindow
+
+ 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( glo || usr )                  // if global or user-set max/min 
-   readarray( data[q], fns[q][count], ilev );  // read new array w/o calculating local max/min
+
+  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
 
@@ -69,27 +90,33 @@
     logmn=log10( mnval );
    }
   }
-
-  ioff=0;                           // ioff will count both i&j b/c data is 1D
-  for( j=0; j<NY; j++ ){            // cycles through y values
-   for( i=0; i<NX; i++ ){           // cycles through x values
-    r=g=b=0;                        // set color values to black
+ 
+  if( scaledepth && xz || scaledepth && yz ) ymax=NY;
+  tmp=(float)ymax/totaldepth;
+  j=0; ioff=0; h=0;                        // ioff will count both i&j b/c data is 1D
+
+  while ( j<ymax ){            // 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;
-      if( num>logmx ) num=63;
-      else
-       num=63*( num-logmn )/( logmx-logmn );
+      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
+      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
@@ -97,38 +124,54 @@
     }
 
     glColor3f( r, g, b );           // put r, g, b into effect
-    glRectf( i, j, i+1, j+1 );      // draws a square for data value 
+    if( scaledepth && xz || scaledepth && yz )
+     glRectf( i, j, i+1, j+(depths[h]*tmp) );
+    else
+     glRectf( i, j, i+1, j+1 );      // draws a square for data value 
     ioff++;                    
    } 
+   if( scaledepth && xz || scaledepth && yz ){
+    j+=(depths[h]*tmp);
+    h++;
+   }
+   else j++;
   } 
+
   glColor3f( 1, 1, 1 );             // set color to white
-  glRectf( NX, 0, NX+1, NY+1 );     // draws a border
-  glRectf( 0, NY, NX, NY+1 );       // draws a border  
+  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)NY/64;                  // sets height of rectangles
-   glRectf( NX+10, y*k, NX+20, (k+1)*y );               // draws rectangle 
+   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, "%.2e", mxval );    // labels color bar with max val
-  bitmap( str, NX+2, NY-1 );
+   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, "%.2e", mnval );    // labels color bar with min val
-  bitmap( str, NX+2, 1 );
+   sprintf( str, "%.1e", mnval );    // labels color bar with min val
+  stroke( str, xmax+2, 1 );
 
-  sprintf( str, "Level %d", ilev ); // labels current level 
-  bitmap( str, 1, NY+3 );
+  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 
-  bitmap( str, 50, NY+3 );
+  stroke( str, xmax/2, ymax+5 );
 
   if( glo )                         // labels how max/min have been set
    sprintf( str, "Global" );        // if glo is set, display Global
@@ -136,58 +179,100 @@
    sprintf( str, "User-set" );      // if usr is set, display User-set
   if( !usr && !glo ) 
    sprintf( str, "Local" );         // else display Local 
-  bitmap( str, NX+12, NY+3 );
+  stroke( str, xmax+8, ymax+8 );
   
   if( anim ){                       // tell user if autoplay is on
    sprintf( str, "Autoplay" );
-   bitmap( str, NX-25, NY+3 );
+   stroke( str, xmax-35, ymax+8 );
   }
 
   if( logscale ){
    sprintf( str, "Log Scale" );     // tell user if log scale is on
-   bitmap( str, NX-25, NY+10 ); 
+   stroke( str, xmax-25, ymax+15); 
   }
 
-  bitmap( fns[q][count], 1, NY+10 ); // labels current file
+  stroke( fns[q][count], 1, ymax+15 ); // labels current file
  
   glutSwapBuffers();                // double buffering set to animate smoothly
   glFlush(); 
  }
 }
 
-void bitmap( char str[], int x, int y ){  // called to display text onscreen
+void stroke( char str[], int x, int y ){  // called to display text onscreen
  int i;
 
- glRasterPos2f( x, y );             // set position of text
+ glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
+ glEnable( GL_BLEND );
+ glEnable( GL_LINE_SMOOTH );
+ glMatrixMode( GL_MODELVIEW );
+
+ 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
-  glutBitmapCharacter( GLUT_BITMAP_HELVETICA_12, str[i] );
+  glutStrokeCharacter( GLUT_STROKE_ROMAN, str[i] );
+
+ glPopMatrix();
 }
 
 void key( unsigned char key, int x, int y ){   // called on key press
- int i;
+ int i, tmp;
+ char fn[MAX];
  
  switch(key){
   case 'q':   exit(0);              // quits on 'q'
               break;
   case 'r':   count=0;              // resets back to first time    
               ilev=1;               // and first level
-              glutPostRedisplay();            
+              xz=yz=0;
               break;
   case 'a':   anim=(anim+1)%2;      // turns anim on/off
-              glutPostRedisplay();            
               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 ){ 
+                printf( "Please enter filename containing depth data: " );
+                scanf( "%s", fn );
+                readdepths( fn );
+               }
+              }
+              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( ilev<MAXNZ ) 
-               ilev++;              // if down arrow pressed, move down a level      
+  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( ilev>1 )    
-               ilev--;              // if up arrow is pressed, move up a level
+  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 
@@ -199,12 +284,28 @@
  
  glutPostRedisplay();            
 
- if (anim )
+ if ( anim )
   switch( value ){    
-   case DOWN : if( ilev==MAXNZ ) ilev=1;                   // if end reached, restart 
+   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( ilev==1 ) ilev=MAXNZ;                   // if end reached, restart 
+   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 
@@ -223,11 +324,25 @@
   glutTimerFunc( 100, TimerFunction, key);             // to scroll automatically
 
  switch(key){
-  case DOWN   :  if( ilev<MAXNZ )      // if you haven't reached the bottom
-                  ilev++;              // keep going down
+  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( ilev>1 )          // if you haven't reached the top
-                  ilev--;              // keep going up
+  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
@@ -242,9 +357,9 @@
 void global(){                         // calculates the max/min for the total data set
  FILE* fp;
  int h, i, j;
- for( h=0; h<setsx*setsy; h++)         // cycles through each window 
+ for( h=0; h<sets; h++)                // cycles through each window 
   for( i=0; i<howmany; i++ )           // cycles through each time 
-   for( j=0; j<MAXNZ; j++ ){           // cycles through each level for each file
+   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
@@ -256,11 +371,18 @@
  
  mxval=0;  
  mnval=100;
- readarray( data[i], fns[i][time], lev );      // read new array of data
- for( j=0; j<NX*NY; j++ ){
+ 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 ) 
+  if( data[i][j] < mnval && data[i][j]!=0 ) 
    mnval=data[i][j];                           // set smallest positive val to mnval 
  }
 }
@@ -275,9 +397,9 @@
   i++;                                         // counts how many filenames there are  
  } 
  fclose( fp );                                 // close file
- howmany=i-1;                                  // saves number of initial filenames 
+ sets=i-1;                                  // saves number of initial filenames 
  
- for(i=0; i<howmany; i++){                     // goes through each read-in filename 
+ 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 
@@ -289,8 +411,21 @@
  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; 
   
@@ -301,49 +436,114 @@
  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;
+ FILE* fp;
  int i;
  
- fp=fopen( filename, "r" );                  // opens the file containing data
+ 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
- for( i=0; i<NX*NY; i++ )                    
-  if( arr[i] < 0 )  arr[i] = pow(10, -20);   // sets negative values to 10^-20 
 
- //do_byteswap_f32( arr, NX*NY );            // switches endian 
+ 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];
-   char 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 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, tmpx, tmpy, winx, winy, parent;
- char filename[MAX];
+ int i, setsx, setsy, tmpx, tmpy, winx, winy, parent;
+ char str[MAX], filename[MAX];
+ FILE* fp;
 
- sscanf(argv[1], "%dx%d", &winx, &winy);  // reads screen resolution from command line
+ 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             
- 
- printf( "Please enter x, y and z dimensions.\n" );   
- scanf( "%d %d %d", &NX, &NY, &MAXNZ );           // prompts user for NX, NY, NZ
- printf( "Please enter filename.\n" );
- scanf( "%s", filename );                         // prompts user for initial filenames 
- printf( "Please enter dimensions of data sets.\n" );
- scanf( "%dx%d", &setsx, &setsy);                 // prompts user for dimensions of subwindows
+ 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
@@ -360,25 +560,30 @@
  glutDisplayFunc( display );
  glutKeyboardFunc( key );                         // called on key press
  glutSpecialFunc( specialkey );                   // called on special key press (arrow keys)
+ 
 
  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 
 
-  local( i, count, ilev );                        // reads curr data array, finds local max/min 
-
   win[i]=glutCreateSubWindow( parent, tmpx, tmpy, winx/setsx, winy/setsy ); // creates subwindow
-  gluOrtho2D( 0, NX+35, 0, NY+15 );               // sets how data is mapped to subwindow
-  glutDisplayFunc( display );                     // sets display func for 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
+  
 
-  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 
-  glutAttachMenu( GLUT_RIGHT_BUTTON );            // menu called on right click
+  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