/[MITgcm]/MITgcm_contrib/darwinview/src/darwin.c
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revision 1.1 by marissa, Wed Jul 11 14:34:55 2007 UTC revision 1.2 by marissa, Thu Jul 12 18:30:19 2007 UTC
# Line 18  void TimerFunction( int ), bitmap( char[ Line 18  void TimerFunction( int ), bitmap( char[
18    
19  float data[MAX][MAX*MAX], mxval, mnval, jet[MAX][MAX];  float data[MAX][MAX*MAX], mxval, mnval, jet[MAX][MAX];
20  float globalmx=0, globalmn=100;  float globalmx=0, globalmn=100;
21  int win[MAX], ilev=1, howmany, count=0, glo=0, usr=0, anim=0;  int win[MAX], ilev=1, howmany, count=0, glo=0, usr=0, anim=0, logscale=0;
22  char initfns[MAX][MAX], fns[MAX][MAX][MAX];  char initfns[MAX][MAX], fns[MAX][MAX][MAX];
23    
24  void menu(int value){  void menu(int value){           // called when menu is opened on right click
  int i;  
25    
26   switch( value ){   switch( value ){
27    case 1: usr=glo=0;         // unset glo & usr, sets local max/min    case 1: usr=glo=0;            // unset glo & usr, sets local max/min
28            glutPostRedisplay();            glutPostRedisplay();  // recall display func with new values
29            break;            break;
30    case 2: glo=1;         // enables global max/min      case 2: glo=1;                // enables global max/min  
31            usr=0;         // unsets usr            usr=0;                // unsets usr
32            mxval=globalmx;     // sets max to globalmx            mxval=globalmx;       // sets max to globalmx
33            mnval=globalmn;     // sets min to globalmn            mnval=globalmn;       // sets min to globalmn
34            glutPostRedisplay(); // display with new values            glutPostRedisplay();  // recall display func with new values
35            break;            break;
36    case 3: usr=1;             // switch to user-set max/min    case 3: usr=1;                // switch to user-set max/min
37            glo=0;             // unset glo            glo=0;                // unset glo
38            printf( "Max=" );  scanf( "%f", &mxval );  // prompt for new max/min            printf( "Max=" );  scanf( "%f", &mxval );  // prompt user for new max
39            printf( "Min=" );  scanf( "%f", &mnval );            printf( "Min=" );  scanf( "%f", &mnval );  // prompt user for new min
40            glutPostRedisplay(); // display with new values            glutPostRedisplay();                       // recall display func with new values
41              break;
42      case 4: logscale=(logscale+1)%2;  // switch log scale on/off
43              glutPostRedisplay();
44            break;            break;
45   }   }
46  }  }
47    
48  void display(void){  void display(void){                 // called on glutPostRedisplay
49   int i, j, ioff, q;   int i, j, ioff, q;
50   float r, g, b, num, k, y;   float r, g, b, k, y;
51     double num, logmx, logmn;
52   char str[MAX];   char str[MAX];
53    
54   for( q=0; q<setsx*setsy; q++ ){    //runs display func for each window   for( q=0; q<setsx*setsy; q++ ){    // runs display func for each subwindow
55    glutSetWindow( win[q] );    glutSetWindow( win[q] );          // sets which subwindow to display to
56    glClear( GL_COLOR_BUFFER_BIT );  // background to black    glClear( GL_COLOR_BUFFER_BIT );   // background to black
57    if( glo || usr )    if( glo || usr )                  // if global or user-set max/min
58     readarray( data[q], fns[q][count], ilev );     readarray( data[q], fns[q][count], ilev );  // read new array w/o calculating local max/min
59    else                              else                              // if local max/min is set
60     local( q, count, ilev );             local( q, count, ilev );         // read new array and calculate local max/min
61    
62    ioff=0;                    // ioff will count thru both i&j b/c data is 1D    if( logscale ){
63    for( j=0; j<NY; j++ ){     if( usr ){
64     for( i=0; i<NX; i++ ){      logmx=(double)mxval;
65      r=g=b=0;                 // set color values to black      logmn=(double)mnval;
66      if( data[q][ioff]==0 );     // if data=0, values stay black     }
67       else{
68        logmx=log10( mxval );
69        logmn=log10( mnval );
70       }
71      }
72    
73      ioff=0;                           // ioff will count both i&j b/c data is 1D
74      for( j=0; j<NY; j++ ){            // cycles through y values
75       for( i=0; i<NX; i++ ){           // cycles through x values
76        r=g=b=0;                        // set color values to black
77        if( data[q][ioff]==0 );           // if data=0, values stay black
78      else{      else{
79       if( data[q][ioff]<mnval )  num=0;  // if data is less than min, =min       if( logscale ){
80          num=(double)data[q][ioff];
81          num=log10( num );
82          if( num<logmn ) num=0;
83          if( num>logmx ) num=63;
84          else
85           num=63*( num-logmn )/( logmx-logmn );
86         }
87       else{       else{
88        if( data[q][ioff]>mxval )  num=63; // if data is more than max, =max        if( data[q][ioff]<mnval )  num=0;   // if data is less than min, =min
89        else        else
90         num=63*( data[q][ioff]-mnval )/( mxval-mnval );  //scale num from 0-63         if( data[q][ioff]>mxval )  num=63; // if data is more than max, =max
91           else
92            num=63*( data[q][ioff]-mnval )/( mxval-mnval );  // scale num from 0-63 (not defined for 64)
93       }       }
94       r=jet[(int)num][0];  // set red val       r=jet[(int)num][0];            // set red val
95       g=jet[(int)num][1];  // set green val       g=jet[(int)num][1];            // set green val
96       b=jet[(int)num][2];  // set blue val         b=jet[(int)num][2];            // set blue val  
97      }      }
98    
99      glColor3f( r, g, b );      // put r, g, b into effect      glColor3f( r, g, b );           // put r, g, b into effect
100      glRectf( i, j, i+1, j+1 ); // draws a square for data value      glRectf( i, j, i+1, j+1 );      // draws a square for data value
101      ioff++;                          ioff++;                    
102     }     }
103    }    }
104    glColor3f( 1, 1, 1 );       // set color to white    glColor3f( 1, 1, 1 );             // set color to white
105    glRectf( NX, 0, NX+1, NY+1 );    // draws a border    glRectf( NX, 0, NX+1, NY+1 );     // draws a border
106    glRectf( 0, NY, NX, NY+1 );        // draws a border      glRectf( 0, NY, NX, NY+1 );       // draws a border  
107    for( i=0; i<64; i++ ){       //draws color bar        for( i=0; i<64; i++ ){            // draws color bar    
108     glColor3f( jet[i][0], jet[i][1], jet[i][2]);         //sets color     glColor3f( jet[i][0], jet[i][1], jet[i][2]);         // sets color
109     k=(float)i;                // turns i into a float     k=(float)i;                      // turns i into a float
110     y=(float)NY/64;            // sets height of rectangles     y=(float)NY/64;                  // sets height of rectangles
111     glRectf( NX+10, y*k, NX+20, (k+1)*y );    // draws rectangle     glRectf( NX+10, y*k, NX+20, (k+1)*y );               // draws rectangle
112    }    }
113    glColor3f( 1, 1, 1 );     // color to white    glColor3f( 1, 1, 1 );             // color to white
114    
115    sprintf( str, "%.2e", mxval );      // labels color bar with max val    if( logscale )
116       sprintf( str, "%.2f", logmx );
117      else
118       sprintf( str, "%.2e", mxval );    // labels color bar with max val
119    bitmap( str, NX+2, NY-1 );    bitmap( str, NX+2, NY-1 );
120        
121    sprintf( str, "%.2e", mnval );      // labels color bar with min val    if( logscale )
122       sprintf( str, "%.2f", logmn );
123      else
124       sprintf( str, "%.2e", mnval );    // labels color bar with min val
125    bitmap( str, NX+2, 1 );    bitmap( str, NX+2, 1 );
126    
127    sprintf( str, "Level %d", ilev );   // labels current level    sprintf( str, "Level %d", ilev ); // labels current level
128    bitmap( str, 1, NY+3);    bitmap( str, 1, NY+3 );
129    
130    if( glo )                   // labels how max/min have been set    sprintf( str, "Time %d", count+1 ); // labels current time
131     sprintf( str, "Global" );  // if glo is set, display Global    bitmap( str, 50, NY+3 );
132    
133      if( glo )                         // labels how max/min have been set
134       sprintf( str, "Global" );        // if glo is set, display Global
135    if( usr )    if( usr )
136     sprintf( str, "User-set" );  // if usr is set, display User-set     sprintf( str, "User-set" );      // if usr is set, display User-set
137    if( !usr && !glo )    if( !usr && !glo )
138     sprintf( str, "Local" );    // else display Local     sprintf( str, "Local" );         // else display Local
139    bitmap( str, NX+12, NY+3);    bitmap( str, NX+12, NY+3 );
140        
141    if( anim ){                  // tell user if autoplay is on    if( anim ){                       // tell user if autoplay is on
142     sprintf( str, "Autoplay" );     sprintf( str, "Autoplay" );
143     bitmap( str, NX-15, NY+3 );     bitmap( str, NX-25, NY+3 );
144      }
145    
146      if( logscale ){
147       sprintf( str, "Log Scale" );     // tell user if log scale is on
148       bitmap( str, NX-25, NY+10 );
149    }    }
150    
151    bitmap( fns[q][count], 1, NY+6 );  // labels current file    bitmap( fns[q][count], 1, NY+10 ); // labels current file
152    
153    glutSwapBuffers();      glutSwapBuffers();                // double buffering set to animate smoothly
154    glFlush();    glFlush();
155   }   }
156  }  }
157    
158  void bitmap( char str[], int x, int y ){  void bitmap( char str[], int x, int y ){  // called to display text onscreen
159   int i;   int i;
160    
161   glRasterPos2f( x, y );   glRasterPos2f( x, y );             // set position of text
162   for( i=0; i<strlen( str ); i++)   for( i=0; i<strlen( str ); i++)    // display each character of str
163    glutBitmapCharacter( GLUT_BITMAP_HELVETICA_12, str[i] );    glutBitmapCharacter( GLUT_BITMAP_HELVETICA_12, str[i] );
164  }  }
165    
166  void key( unsigned char key, int x, int y ){   //called on key press  void key( unsigned char key, int x, int y ){   // called on key press
167   int i;   int i;
168    
169   switch(key){   switch(key){
170    case 'q':   exit(0);     //quits on 'q'    case 'q':   exit(0);              // quits on 'q'
171                break;                break;
172    case 'r':   count=0;    case 'r':   count=0;              // resets back to first time    
173                ilev=1;                ilev=1;               // and first level
174                glutPostRedisplay();                            glutPostRedisplay();            
175                break;                break;
176    case 'a':   anim++;            // switches autoplay off/on      case 'a':   anim=(anim+1)%2;      // turns anim on/off
               anim=anim%2;       // when a is pressed repeatedly  
177                glutPostRedisplay();                            glutPostRedisplay();            
178                break;                break;
179   }   }
180  }  }
181    
182  void TimerFunction( int value ){  void TimerFunction( int value ){    // called when anim is set and arrow key is pressed
183   int i;   int i;
184    
185   switch(value){          // increments in the correct direction   switch(value){                     // increments in the correct direction
186    case DOWN : if( ilev<MAXNZ )    case DOWN : if( ilev<MAXNZ )
187                 ilev++;    // if down arrow pressed, moves down levels                       ilev++;              // if down arrow pressed, move down a level      
188                break;                break;
189    case UP   : if( ilev>1 )        case UP   : if( ilev>1 )    
190                 ilev--;    // if up arrow is pressed, moves up levels                 ilev--;              // if up arrow is pressed, move up a level
191                break;                break;
192    case LEFT : if( count>0 )          case LEFT : if( count>0 )      
193                 count--;   // if left arrow is pressed, moves back in time                 count--;             // if left arrow is pressed, move back one time step
194                break;                break;
195    case RIGHT: if( count<howmany-1 )    case RIGHT: if( count<howmany-1 )
196                 count++;   // if right arrow is pressed, moves forward in time                 count++;             // if right arrow is pressed, moves forward one time step
197                break;                break;
198   }   }
199    
# Line 165  void TimerFunction( int value ){ Line 201  void TimerFunction( int value ){
201    
202   if (anim )   if (anim )
203    switch( value ){        switch( value ){    
204     case DOWN : if( ilev==MAXNZ ) ilev=1;   // sets limit that you can go down     case DOWN : if( ilev==MAXNZ ) ilev=1;                   // if end reached, restart
205                 glutTimerFunc( 100, TimerFunction, value ); // recalls itself                 glutTimerFunc( 100, TimerFunction, value ); // recalls itself
206                 break;                 break;
207     case UP   : if( ilev==1 ) ilev=MAXNZ;   // sets limit that you can go up     case UP   : if( ilev==1 ) ilev=MAXNZ;                   // if end reached, restart
208                 glutTimerFunc( 100, TimerFunction, value ); // recalls itself                 glutTimerFunc( 100, TimerFunction, value ); // recalls itself
209                 break;                 break;
210     case LEFT : if( count==0 ) count=howmany-1;// sets limit that you can go left     case LEFT : if( count==0 ) count=howmany-1;             // if end reached, restart
211                 glutTimerFunc( 100, TimerFunction, value ); // recalls itself                 glutTimerFunc( 100, TimerFunction, value ); // recalls itself
212                 break;                 break;
213     case RIGHT: if( count==howmany-1 ) count=0; //sets limit that you can go right     case RIGHT: if( count==howmany-1 ) count=0;             // if end reached, restart                
214                 glutTimerFunc( 100, TimerFunction, value ); // recalls itself                 glutTimerFunc( 100, TimerFunction, value ); // recalls itself
215                 break;                 break;
216    }    }
# Line 183  void TimerFunction( int value ){ Line 219  void TimerFunction( int value ){
219  void specialkey( int key, int x, int y ){  void specialkey( int key, int x, int y ){
220   int i;   int i;
221    
222   if( anim )     // if animation is set, call the timer function   if( anim )                       // if animation is set, call the timer function
223    glutTimerFunc( 100, TimerFunction, key);    glutTimerFunc( 100, TimerFunction, key);             // to scroll automatically
224    
225   switch(key){   switch(key){
226    case DOWN   :  if( ilev<MAXNZ ) // if you haven't reached the bottom    case DOWN   :  if( ilev<MAXNZ )      // if you haven't reached the bottom
227                    ilev++;         // keep going down                    ilev++;              // keep going down
228                   break;                   break;
229    case UP     :  if( ilev>1 )     // if you haven't reached the top    case UP     :  if( ilev>1 )          // if you haven't reached the top
230                    ilev--;         // keep going up                    ilev--;              // keep going up
231                   break;                   break;
232    case RIGHT  :  if( count<howmany-1 ) // if you haven't reached the last file    case RIGHT  :  if( count<howmany-1 ) // if you haven't reached the last file
233                    count++;             // keep going right                    count++;             // keep going right
# Line 203  void specialkey( int key, int x, int y ) Line 239  void specialkey( int key, int x, int y )
239   glutPostRedisplay();               glutPostRedisplay();            
240  }  }
241    
242  void global(){  // calculates the max/min for the total data set  void global(){                         // calculates the max/min for the total data set
243   FILE* fp;   FILE* fp;
244   int h, i, j;   int h, i, j;
245   for( h=0; h<setsx*setsy; h++) // cycles through each data set   for( h=0; h<setsx*setsy; h++)         // cycles through each window
246    for( i=0; i<howmany; i++ )   // cycles through each time    for( i=0; i<howmany; i++ )           // cycles through each time
247     for( j=0; j<MAXNZ; j++ ){   // cycles through each level for each file     for( j=0; j<MAXNZ; j++ ){           // cycles through each level for each file
248      local( h, i, j );         // calculates local/max/min for specific data set      local( h, i, j );                  // calculates local max/min for specific data set
249      if( mxval > globalmx ) globalmx = mxval;   // sets highest value to globalmx      if( mxval > globalmx ) globalmx = mxval;   // sets highest value to globalmx
250      if( mnval < globalmn ) globalmn = mnval;   // sets lowest value to globalmn      if( mnval < globalmn ) globalmn = mnval;   // sets lowest value to globalmn
251     }     }
252  }  }
253    
254  void local( int i, int time, int lev ){  // calculates local max/min  void local( int i, int time, int lev ){        // calculates local max/min
255   int j;   int j;
256    
257   mxval=0;     mxval=0;  
258   mnval=100;   mnval=100;
259   readarray( data[i], fns[i][time], lev ); // read new array of data   readarray( data[i], fns[i][time], lev );      // read new array of data
260   for( j=0; j<NX*NY; j++ ){   for( j=0; j<NX*NY; j++ ){
261    if( data[i][j] > mxval )  mxval=data[i][j]; // set largest val to mxval    if( data[i][j] > mxval )
262    if( data[i][j] < mnval )  mnval=data[i][j]; // set smallest val to mnval     mxval=data[i][j];                           // set largest val to mxval
263      if( data[i][j] < mnval && data[i][j] > 0 )
264       mnval=data[i][j];                           // set smallest positive val to mnval
265   }   }
266  }  }
267    
268  void readnames( char filename[] ){  // reads in list of filenames  void readnames( char filename[] ){             // reads in list of filenames
269   FILE* fp;   FILE* fp;
270   int i=0, j=0;   int i=0, j=0;
271    
272   fp=fopen( filename, "r" );    // opens list   fp=fopen( filename, "r" );                    // opens list of filenames
273   while( !feof(fp) ){           // reads until the end of the file   while( !feof(fp) ){                           // reads until the end of the file
274    fscanf( fp, "%s", initfns[i] );   // places filename into an array of strings    fscanf( fp, "%s", initfns[i] );              // places filename into an array of strings
275    i++;                         // counts how many filenames there are      i++;                                         // counts how many filenames there are  
276   }   }
277   fclose( fp );                 // close file   fclose( fp );                                 // close file
278   howmany=i-1;                   howmany=i-1;                                  // saves number of initial filenames
279    
280   for(i=0; i<howmany; i++){   for(i=0; i<howmany; i++){                     // goes through each read-in filename
281    fp=fopen( initfns[i], "r" );    fp=fopen( initfns[i], "r" );                 // opens each filename  
282    j=0;    j=0;
283    while( !feof(fp) ){    while( !feof(fp) ){                          // reads in filenames from each filename
284     fscanf( fp, "%s", fns[i][j]);     fscanf( fp, "%s", fns[i][j]);              
285     j++;     j++;
286    }    }
287    fclose(fp);    fclose(fp);                                  // close file
288   }   }
289   howmany=j-1;   howmany=j-1;                                  // saves number of data filenames  
290  }  }
291    
292  void readjet(){  //reads in color scale values  void readjet(){               //reads in color scale values
293    
294   FILE* fp;   FILE* fp;
295   int i, j;   int i, j;
296        
297   fp=fopen( "jet.dat", "r" );  // opens file containing values   fp=fopen( "jet.dat", "r" );  // opens file containing values
298   for( i=0; i<64; i++ )       // reads in 64 sets of r, g, b values   for( i=0; i<64; i++ )        // reads in 64 sets of r, g, b values
299    for( j=0; j<3; j++ )    for( j=0; j<3; j++ )
300     fscanf( fp, "%f", &jet[i][j] );     fscanf( fp, "%f", &jet[i][j] );
301   fclose( fp );              // closes file   fclose( fp );                // closes file
302  }  }
303    
304    
# Line 268  void readarray( float arr[], char filena Line 306  void readarray( float arr[], char filena
306   FILE *fp;   FILE *fp;
307   int i;   int i;
308    
309   fp=fopen( filename, "r" );  // opens the file containing data   fp=fopen( filename, "r" );                  // opens the file containing data
310   fseek( fp, (il-1)*NX*NY*4, SEEK_SET ); // seeks to the correct level using ilev   fseek( fp, (il-1)*NX*NY*4, SEEK_SET );      // seeks to the correct place using ilev
311   fread( arr, sizeof( arr[0] ), NX*NY, fp );  // reads in data to fill one level   fread( arr, sizeof( arr[0] ), NX*NY, fp );  // reads in data to fill one level
312   fclose( fp );                         // close file   fclose( fp );                               // close file
313   //do_byteswap_f32( arr, NX*NY );          // swaps the binary data   for( i=0; i<NX*NY; i++ )                    
314      if( arr[i] < 0 )  arr[i] = pow(10, -20);   // sets negative values to 10^-20
315    
316     //do_byteswap_f32( arr, NX*NY );            // switches endian
317  }  }
318    
319  void do_byteswap_f32( float arr[], int nel ) // switches endian  void do_byteswap_f32( float arr[], int nel ) // switches endian
# Line 290  void do_byteswap_f32( float arr[], int n Line 331  void do_byteswap_f32( float arr[], int n
331     }     }
332  }  }
333    
 void parentfunc(){  
  glClear( GL_COLOR_BUFFER_BIT );  // background to black  
  glutSwapBuffers();  
  glFlush();  
 }  
   
334  int main( int argc, char *argv[] ){  int main( int argc, char *argv[] ){
335   int i, tmpx, tmpy, winx, winy, parent;   int i, tmpx, tmpy, winx, winy, parent;
336   char filename[MAX];   char filename[MAX];
337    
338   sscanf(argv[1], "%dx%d", &winx, &winy);   sscanf(argv[1], "%dx%d", &winx, &winy);  // reads screen resolution from command line
339   winy-=20;   winy-=60;  winx-=20;                     // adjusts resolution so edges won't get cut off            
340    
341   printf( "Please enter x, y and z dimensions.\n" );     printf( "Please enter x, y and z dimensions.\n" );  
342   scanf( "%d %d %d", &NX, &NY, &MAXNZ );   //user-set NX, NY, NZ   scanf( "%d %d %d", &NX, &NY, &MAXNZ );           // prompts user for NX, NY, NZ
343   printf( "Please enter filename.\n" );   printf( "Please enter filename.\n" );
344   scanf( "%s", filename );   //filename contains names of data files   scanf( "%s", filename );                         // prompts user for initial filenames
345   printf( "Please enter dimensions of data sets.\n" );   printf( "Please enter dimensions of data sets.\n" );
346   scanf( "%dx%d", &setsx, &setsy);   scanf( "%dx%d", &setsx, &setsy);                 // prompts user for dimensions of subwindows
347    
348   readjet();                        // stores color values   readjet();                               // stores color values
349   readnames( filename );   // gets list of filenames to read from   readnames( filename );                   // gets list of filenames to read from
350   global();                         // calculates max and min for all data   global();                                // calculates max and min for all data
351    
352   glutInit( &argc, argv );   glutInit( &argc, argv );                
353   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );   // sets rgb mode and double buffering
354   glutInitWindowSize( winx, winy );   glutInitWindowSize( winx, winy );                // parent window will cover screen
355   glutInitWindowPosition( 10, 10 );   glutInitWindowPosition( 10, 10 );                // location of parent window
356   parent=glutCreateWindow( WINDOW );   parent=glutCreateWindow( WINDOW );               // creates parent window
357    
358   glClearColor( 0, 0, 0, 0 );    // sets clear color to black   glClearColor( 0, 0, 0, 0 );                      // sets clear color to black
359   gluOrtho2D( 0, winx , winy, 0 );  // sets how data is mapped to window   gluOrtho2D( 0, winx , winy, 0 );                 // sets(0,0) as top left corner
360   glutDisplayFunc( display );   glutDisplayFunc( display );
361   glutKeyboardFunc( key );   // called on key press   glutKeyboardFunc( key );                         // called on key press
362   glutSpecialFunc( specialkey );  // called on special key press (arrow keys)   glutSpecialFunc( specialkey );                   // called on special key press (arrow keys)
363    
364   for( i=0; i<setsx*setsy; i++ ){   for( i=0; i<setsx*setsy; i++ ){
365    tmpx = (i%setsx)*(winx/setsx);    tmpx = (i%setsx)*(winx/setsx);                  // x coordinate of top left corner of subwindow
366    tmpy = (i/setsx)*(winy/setsy);    tmpy = (i/setsx)*(winy/setsy);                  // y coordinate of top left corner of subwindow
367    
368    local( i, count, ilev );      // sets curr data array, finds local max/min    local( i, count, ilev );                        // reads curr data array, finds local max/min
369    
370    win[i]=glutCreateSubWindow( parent, tmpx, tmpy, winx/setsx, winy/setsy );    win[i]=glutCreateSubWindow( parent, tmpx, tmpy, winx/setsx, winy/setsy ); // creates subwindow
371    gluOrtho2D( 0, NX+35, 0, NY+15 );  // sets how data is mapped to window    gluOrtho2D( 0, NX+35, 0, NY+15 );               // sets how data is mapped to subwindow
372    glutDisplayFunc( display );    glutDisplayFunc( display );                     // sets display func for subwindow
373    glutKeyboardFunc( key );   // called on key press    glutKeyboardFunc( key );                        // called on key press
374    glutSpecialFunc( specialkey );  // called on special key press (arrow keys)    glutSpecialFunc( specialkey );                  // called on special key press (arrow keys)
375    
376    glutCreateMenu( menu );   // adds a menu    glutCreateMenu( menu );                         // adds a menu
377     glutAddMenuEntry( "Local Color Scale", 1 );   // describes choices     glutAddMenuEntry( "Local Color Scale", 1 );    // adds a menu entry
378     glutAddMenuEntry( "Global Color Scale", 2 );     glutAddMenuEntry( "Global Color Scale", 2 );   // adds a menu entry
379     glutAddMenuEntry( "User-Set Color Scale", 3 );     glutAddMenuEntry( "User-Set Color Scale", 3 ); // adds a menu entry
380    glutAttachMenu( GLUT_RIGHT_BUTTON );  // menu called on right click     glutAddMenuEntry( "Log Scale (on/off)", 4 );   // adds a menu entry
381      glutAttachMenu( GLUT_RIGHT_BUTTON );            // menu called on right click
382   }   }
383    
384   glutMainLoop();   glutMainLoop();                                  // begin processing events
385   return 0;   return 0;
386  }  }
387    
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