--- MITgcm_contrib/darwinview/src/darwin.c	2007/07/12 18:30:19	1.2
+++ MITgcm_contrib/darwinview/src/darwin.c	2007/07/13 18:47:12	1.3
@@ -10,7 +10,7 @@
 #define LEFT 100
 #define MAX 200
  
-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();
@@ -18,7 +18,7 @@
 
 float data[MAX][MAX*MAX], mxval, mnval, jet[MAX][MAX];
 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, logscale=0, nonegs=1, endian=0;
 char initfns[MAX][MAX], fns[MAX][MAX][MAX];
 
 void menu(int value){           // called when menu is opened on right click
@@ -42,16 +42,21 @@
   case 4: logscale=(logscale+1)%2;  // switch log scale on/off
           glutPostRedisplay();
           break;
+  case 5: nonegs=(nonegs+1)%2;      // switch allowance of negatives on/off 
+          glutPostRedisplay();
+          break;
+  case 6: endian=(endian+1)%2;      // switch between big/little endian
+          glutPostRedisplay();
+          break;
  }
 }
-
 void display(void){                 // called on glutPostRedisplay
  int i, j, ioff, q; 
  float r, g, b, k, y;
  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 
@@ -80,16 +85,19 @@
       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
@@ -115,13 +123,13 @@
   if( logscale )
    sprintf( str, "%.2f", logmx );
   else
-   sprintf( str, "%.2e", mxval );    // labels color bar with max val
+   sprintf( str, "%.1e", mxval );    // labels color bar with max val
   bitmap( str, NX+2, NY-1 );
   
   if( logscale )
    sprintf( str, "%.2f", logmn );
   else
-   sprintf( str, "%.2e", mnval );    // labels color bar with min val
+   sprintf( str, "%.1e", mnval );    // labels color bar with min val
   bitmap( str, NX+2, 1 );
 
   sprintf( str, "Level %d", ilev ); // labels current level 
@@ -164,7 +172,7 @@
 }
 
 void key( unsigned char key, int x, int y ){   // called on key press
- int i;
+ int i, tmp;
  
  switch(key){
   case 'q':   exit(0);              // quits on 'q'
@@ -183,7 +191,7 @@
  int i;
 
  switch(value){                     // increments in the correct direction
-  case DOWN : if( ilev<MAXNZ ) 
+  case DOWN : if( ilev<NZ ) 
                ilev++;              // if down arrow pressed, move down a level      
               break;
   case UP   : if( ilev>1 )    
@@ -201,10 +209,10 @@
 
  if (anim )
   switch( value ){    
-   case DOWN : if( ilev==MAXNZ ) ilev=1;                   // if end reached, restart 
+   case DOWN : if( ilev==NZ ) 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( 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 
@@ -223,7 +231,7 @@
   glutTimerFunc( 100, TimerFunction, key);             // to scroll automatically
 
  switch(key){
-  case DOWN   :  if( ilev<MAXNZ )      // if you haven't reached the bottom
+  case DOWN   :  if( ilev<NZ )      // if you haven't reached the bottom
                   ilev++;              // keep going down
                  break;
   case UP     :  if( ilev>1 )          // if you haven't reached the top
@@ -242,9 +250,9 @@
 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
@@ -260,7 +268,7 @@
  for( j=0; j<NX*NY; 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 +283,9 @@
   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 
@@ -290,7 +298,6 @@
 }
 
 void readjet(){               //reads in color scale values
- 
  FILE* fp;
  int i, j; 
   
@@ -301,49 +308,58 @@
  fclose( fp );                // closes file
 }
 
-
 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
  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;
+ int i, setsx, setsy, tmpx, tmpy, winx, winy, parent;
  char filename[MAX];
 
- sscanf(argv[1], "%dx%d", &winx, &winy);  // reads screen resolution from command line
+ sscanf( argv[1], "%dx%d", &winx, &winy );  // reads screen resolution from command line
  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
+ scanf( "%d %d %d", &NX, &NY, &NZ );           // 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
+ scanf( "%dx%d", &setsx, &setsy );                 // prompts user for dimensions of subwindows
 
  readjet();                               // stores color values
  readnames( filename );                   // gets list of filenames to read from
@@ -360,25 +376,30 @@
  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
   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