Annotation of loncom/xml/lonplot.pm, revision 1.18

1.1       matthew     1: # The LearningOnline Network with CAPA
                      2: # Dynamic plot
                      3: #
1.18    ! matthew     4: # $Id: lonplot.pm,v 1.17 2001/12/21 22:45:47 matthew Exp $
1.1       matthew     5: #
                      6: # Copyright Michigan State University Board of Trustees
                      7: #
                      8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      9: #
                     10: # LON-CAPA is free software; you can redistribute it and/or modify
                     11: # it under the terms of the GNU General Public License as published by
                     12: # the Free Software Foundation; either version 2 of the License, or
                     13: # (at your option) any later version.
                     14: #
                     15: # LON-CAPA is distributed in the hope that it will be useful,
                     16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     18: # GNU General Public License for more details.
                     19: #
                     20: # You should have received a copy of the GNU General Public License
                     21: # along with LON-CAPA; if not, write to the Free Software
                     22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     23: #
                     24: # /home/httpd/html/adm/gpl.txt
                     25: #
                     26: # http://www.lon-capa.org/
                     27: #
1.3       matthew    28: # 12/15/01 Matthew
1.14      matthew    29: # 12/17 12/18 12/19 12/20 12/21 Matthew
1.1       matthew    30: package Apache::lonplot;
1.10      matthew    31: 
1.1       matthew    32: use strict;
1.10      matthew    33: use Apache::File;
1.1       matthew    34: use Apache::response;
1.2       matthew    35: use Apache::lonxml;
1.10      matthew    36: 
1.12      matthew    37: use Digest::MD5 qw(md5_base64);
1.1       matthew    38: 
                     39: sub BEGIN {
                     40:   &Apache::lonxml::register('Apache::lonplot',('plot'));
                     41: }
                     42: 
1.10      matthew    43: ## 
                     44: ## Description of data structures:
                     45: ##
                     46: ##  %plot       %key    %axis
                     47: ## --------------------------
                     48: ##  height      title   color
                     49: ##  width       box     xmin
                     50: ##  bgcolor     pos     xmax
                     51: ##  fgcolor             ymin
                     52: ##  transparent         ymax
                     53: ##  grid
                     54: ##  border
                     55: ##  font
                     56: ##
                     57: ##  @labels: $labels[$i] = \%label
                     58: ##           %label: text, xpos, ypos, justify
1.14      matthew    59: ##
1.10      matthew    60: ##  @curves: $curves[$i] = \%curve
1.14      matthew    61: ##           %curve: name, linestyle, ( function | data )
1.10      matthew    62: ##
                     63: ##  $curves[$i]->{'data'} = [ [x1,x2,x3,x4],
                     64: ##                            [y1,y2,y3,y4] ]
                     65: ##
                     66: ##------------------------------------------------------------
1.1       matthew    67: ##
                     68: ## Tests used in checking the validitity of input
                     69: ##
1.11      matthew    70: my $int_test       = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};
                     71: my $real_test      = sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d*\.?\d*$/};
                     72: my $color_test     = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-f]{6}$/};
1.1       matthew    73: my $onoff_test     = sub {$_[0]=~/^(on|off)$/};
1.15      matthew    74: my $key_pos_test   = sub {$_[0]=~/^(top|bottom|right|left|outside|below| )+$/};
1.1       matthew    75: my $sml_test       = sub {$_[0]=~/^(small|medium|large)$/};
                     76: my $linestyle_test = sub {$_[0]=~/^(lines|linespoints|dots|points|steps)$/};
1.15      matthew    77: my $words_test     = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w\(\)]+ ?)+$/};
1.1       matthew    78: ##
                     79: ## Default values for attributes of elements
                     80: ##
                     81: my %plot_defaults = 
                     82:     (
1.10      matthew    83:      height       => {default => 200,       test => $int_test   },
                     84:      width        => {default => 200,       test => $int_test   },
                     85:      bgcolor      => {default => 'xffffff', test => $color_test },
                     86:      fgcolor      => {default => 'x000000', test => $color_test },
                     87:      transparent  => {default => 'off',     test => $onoff_test },
                     88:      grid         => {default => 'off',     test => $onoff_test },
                     89:      border       => {default => 'on',      test => $onoff_test },
1.16      matthew    90:      font         => {default => 'medium',  test => $sml_test   },
                     91:      align        => {default => 'left',    test => $words_test }
1.1       matthew    92:      );
                     93: 
                     94: my %key_defaults = 
                     95:     (
1.10      matthew    96:      title => { default => '',          test => $words_test   },
                     97:      box   => { default => 'off',       test => $onoff_test   },
                     98:      pos   => { default => 'top right', test => $key_pos_test }
1.1       matthew    99:      );
                    100: 
                    101: my %label_defaults = 
                    102:     (
1.10      matthew   103:      xpos    => {default => 0,         test => $real_test     },
                    104:      ypos    => {default => 0,         test => $real_test     },
1.5       matthew   105:      justify => {default => 'left',    
1.10      matthew   106:                  test => sub {$_[0]=~/^(left|right|center)$/} }
1.1       matthew   107:      );
                    108: 
                    109: my %axis_defaults = 
                    110:     (
1.5       matthew   111:      color     => {default => 'x000000', test => $color_test},
1.11      matthew   112:      xmin      => {default => '-10.0',   test => $real_test },
                    113:      xmax      => {default => ' 10.0',   test => $real_test },
                    114:      ymin      => {default => '-10.0',   test => $real_test },
1.15      matthew   115:      ymax      => {default => ' 10.0',   test => $real_test },
                    116:      linestyle => {default => 'points',  test => $linestyle_test}
1.1       matthew   117:      );
                    118: 
                    119: my %curve_defaults = 
                    120:     (
1.13      matthew   121:      color     => {default => 'x000000', test => $color_test     },
                    122:      name      => {default => '',        test => $words_test     },
                    123:      linestyle => {default => 'lines',   test => $linestyle_test }
1.1       matthew   124:      );
                    125: 
                    126: ##
                    127: ## End of defaults
                    128: ##
                    129: my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves);
                    130: 
                    131: sub start_plot {
1.10      matthew   132:     %plot    = undef;   %key     = undef;   %axis   = undef; 
                    133:     $title   = undef;   $xlabel  = undef;   $ylabel = undef;
                    134:     $#labels = -1;      $#curves = -1;
1.6       matthew   135:     #
1.1       matthew   136:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    137:     my $result='';
1.4       matthew   138:     if ($target eq 'web') {
1.17      matthew   139: 	&Apache::lonxml::register('Apache::lonplot',
                    140: 	      ('title','xlabel','ylabel','key','axis','label','curve'));
                    141: 	push (@Apache::lonxml::namespace,'plot');
                    142: 	## Always evaluate the insides of the <plot></plot> tags
                    143: 	my $inside = &Apache::lonxml::get_all_text("/plot",$$parser[-1]);
                    144: 	$inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
                    145: 	&Apache::lonxml::newparser($parser,\$inside);
                    146: 	##-------------------------------------------------------
                    147: 	&get_attributes(\%plot,\%plot_defaults,$parstack,$safeeval,
                    148: 			$tagstack->[-1]);
1.4       matthew   149:     }
1.1       matthew   150:     return '';
                    151: }
                    152: 
                    153: sub end_plot {
                    154:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    155:     pop @Apache::lonxml::namespace;
1.4       matthew   156:     &Apache::lonxml::deregister('Apache::lonplot',
                    157: 	('title','xlabel','ylabel','key','axis','label','curve'));
                    158:     my $result = '';
                    159:     if ($target eq 'web') {
1.13      matthew   160: 	##
                    161: 	## Make sure we have all the input we need:
                    162: 	if (! defined(%plot  )) { &set_defaults(\%plot,\%plot_defaults); }
1.14      matthew   163: 	if (! defined(%key   )) {} # No key for this plot
1.13      matthew   164: 	if (! defined(%axis  )) { &set_defaults(\%axis,\%axis_defaults); }
1.14      matthew   165: 	if (! defined($title )) {} # No title for this plot
                    166: 	if (! defined($xlabel)) {} # No xlabel for this plot
                    167: 	if (! defined($ylabel)) {} # No ylabel for this plot
1.13      matthew   168: 	if ($#labels < 0) { } # No labels for this plot
1.14      matthew   169: 	if ($#curves < 0) { 
                    170: 	    &Apache::lonxml::warning("No curves specified for plot!!!!");
                    171: 	    return '';
                    172: 	}
                    173: 	my $curve;
                    174: 	foreach $curve (@curves) {
                    175: 	    if (!defined($curve->{'function'})&&!defined($curve->{'data'})){
                    176: 		&Apache::lonxml::warning("One of the curves specified did not contain any <data> or <function> declarations\n");
                    177: 		return '';
                    178: 	    }
                    179: 	}
1.13      matthew   180: 	##
                    181: 	## Determine filename
1.4       matthew   182: 	my $tmpdir = '/home/httpd/perl/tmp/';
1.12      matthew   183: 	my $filename = $ENV{'user.name'}.'_'.$ENV{'user.domain'}.
1.13      matthew   184: 	    '_'.time.'_'.$$.'_plot.data';
1.4       matthew   185: 	## Write the plot description to the file
1.12      matthew   186: 	my $fh=Apache::File->new(">$tmpdir$filename");
                    187: 	print $fh &write_gnuplot_file();
1.14      matthew   188: 	close($fh);
1.4       matthew   189: 	## return image tag for the plot
1.12      matthew   190: 	$result .= <<"ENDIMAGE";
1.16      matthew   191: <img src    = "/cgi-bin/plot.gif?$filename" 
                    192:      width  = "$plot{'width'}" 
                    193:      height = "$plot{'height'}"
                    194:      align  = "$plot{'align'}"
                    195:      alt    = "/cgi-bin/plot.gif?$filename" />
1.12      matthew   196: ENDIMAGE
1.4       matthew   197:     }
1.1       matthew   198:     return $result;
                    199: }
1.2       matthew   200: 
1.1       matthew   201: ##----------------------------------------------------------------- key
                    202: sub start_key {
                    203:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    204:     my $result='';
1.17      matthew   205:     if ($target eq 'web') {
                    206: 	&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
1.11      matthew   207: 		    $tagstack->[-1]);
1.4       matthew   208: 	# This routine should never return anything.
                    209:     }
1.1       matthew   210:     return $result;
                    211: }
                    212: 
                    213: sub end_key {
                    214:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    215:     my $result = '';
1.4       matthew   216:     if ($target eq 'web') {
                    217: 	# This routine should never return anything.
                    218:     }
1.1       matthew   219:     return $result;
                    220: }
                    221: ##------------------------------------------------------------------- title
                    222: sub start_title {
                    223:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    224:     my $result='';
1.4       matthew   225:     if ($target eq 'web') {
1.17      matthew   226: 	$title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
1.4       matthew   227: 	# This routine should never return anything.
                    228:     }
1.1       matthew   229:     return $result;
                    230: }
                    231: 
                    232: sub end_title {
                    233:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    234:     my $result = '';
1.4       matthew   235:     if ($target eq 'web') {
                    236: 	# This routine should never return anything.
                    237:     }
1.1       matthew   238:     return $result;
                    239: }
                    240: ##------------------------------------------------------------------- xlabel
                    241: sub start_xlabel {
                    242:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    243:     my $result='';
1.4       matthew   244:     if ($target eq 'web') {
1.17      matthew   245: 	$xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
1.4       matthew   246: 	# This routine should never return anything.
                    247:     }
1.1       matthew   248:     return $result;
                    249: }
                    250: 
                    251: sub end_xlabel {
                    252:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    253:     my $result = '';
1.4       matthew   254:     if ($target eq 'web') {
                    255: 	# This routine should never return anything.
                    256:     }
1.1       matthew   257:     return $result;
                    258: }
                    259: ##------------------------------------------------------------------- ylabel
                    260: sub start_ylabel {
                    261:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    262:     my $result='';
1.4       matthew   263:     if ($target eq 'web') {
1.17      matthew   264: 	$ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
1.4       matthew   265: 	# This routine should never return anything.
                    266:     }
1.1       matthew   267:     return $result;
                    268: }
                    269: 
                    270: sub end_ylabel {
                    271:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    272:     my $result = '';
1.4       matthew   273:     if ($target eq 'web') {
                    274: 	# This routine should never return anything.
                    275:     }
1.1       matthew   276:     return $result;
                    277: }
                    278: ##------------------------------------------------------------------- label
                    279: sub start_label {
                    280:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    281:     my $result='';
1.17      matthew   282:     if ($target eq 'web') {
                    283: 	my %label;
                    284: 	&get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
1.11      matthew   285: 		    $tagstack->[-1]);
1.17      matthew   286: 	$label{'text'} = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
                    287: 	if (! &$words_test($label{'text'})) {
                    288: 	    # I should probably warn about it, too.
                    289: 	    $label{'text'} = 'Illegal text';
                    290: 	}
                    291: 	push(@labels,\%label);
1.4       matthew   292:     }
1.17      matthew   293:     # This routine should never return anything.
1.1       matthew   294:     return $result;
                    295: }
                    296: 
                    297: sub end_label {
                    298:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    299:     my $result = '';
1.4       matthew   300:     if ($target eq 'web') {
                    301: 	# This routine should never return anything.
                    302:     }
1.1       matthew   303:     return $result;
                    304: }
                    305: 
                    306: ##------------------------------------------------------------------- curve
                    307: sub start_curve {
                    308:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    309:     my $result='';
1.17      matthew   310:     if ($target eq 'web') {
                    311: 	my %curve;
                    312: 	&get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
1.11      matthew   313: 		    $tagstack->[-1]);
1.17      matthew   314: 	push (@curves,\%curve);
                    315: 	&Apache::lonxml::register('Apache::lonplot',('function','data'));
                    316: 	push (@Apache::lonxml::namespace,'curve');
1.4       matthew   317: 	# This routine should never return anything.
                    318:     }
1.1       matthew   319:     return $result;
                    320: }
                    321: 
                    322: sub end_curve {
                    323:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    324:     my $result = '';
1.4       matthew   325:     if ($target eq 'web') {
1.17      matthew   326: 	pop @Apache::lonxml::namespace;
                    327: 	&Apache::lonxml::deregister('Apache::lonplot',('function','data'));
1.4       matthew   328: 	# This routine should never return anything.
                    329:     }
1.1       matthew   330:     return $result;
                    331: }
                    332: ##------------------------------------------------------------ curve function
                    333: sub start_function {
                    334:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    335:     my $result='';
1.4       matthew   336:     if ($target eq 'web') {
1.17      matthew   337: 	if (exists($curves[-1]->{'data'})) {
                    338: 	    &Apache::lonxml::warning('Use of <function> precludes use of <data>.  The <data> will be omitted in favor of the <function> declaration.');
                    339: 	    delete $curves[-1]->{'data'} ;
                    340: 	}
                    341: 	$curves[-1]->{'function'} = 
                    342: 	    &Apache::lonxml::get_all_text("/function",$$parser[-1]);
1.4       matthew   343: 	# This routine should never return anything.
                    344:     }
1.1       matthew   345:     return $result;
                    346: }
                    347: 
                    348: sub end_function {
                    349:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    350:     my $result = '';
1.4       matthew   351:     if ($target eq 'web') {
                    352: 	# This routine should never return anything.
                    353:     }
1.1       matthew   354:     return $result;
                    355: }
                    356: ##------------------------------------------------------------ curve  data
                    357: sub start_data {
                    358:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    359:     my $result='';
1.4       matthew   360:     if ($target eq 'web') {
1.17      matthew   361: 	if (exists($curves[-1]->{'function'})) {
                    362: 	    &Apache::lonxml::warning('Use of <data> precludes use of .'.
                    363: 	    '<function>.  The <function> will be omitted in favor of '.
                    364:             'the <data> declaration.');
                    365: 	    delete($curves[-1]->{'function'});
                    366: 	}
                    367: 	my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
                    368: 	&Apache::lonxml::warning(
1.18    ! matthew   369: 	       ' Length of data string: '.length($datatext));    
1.17      matthew   370: 	$datatext =~ s/\s+/ /g;  
                    371: 	# Need to do some error checking on the @data array - 
                    372: 	# make sure it's all numbers and make sure each array 
                    373: 	# is of the same length.
                    374: 	my @data;
                    375: 	if ($datatext =~ /,/) {
                    376: 	    @data = split /,/,$datatext;
                    377: 	} else { # Assume it's space seperated.
                    378: 	    @data = split / /,$datatext;
                    379: 	}
                    380: 	&Apache::lonxml::warning(' Data Points: '.$#data);
                    381: 	for (my $i=0;$i<=$#data;$i++) {
                    382: 	    # Check that it's non-empty
                    383: 	    # Check that it's a number
                    384: 	    # Maybe I need a 'debug=on' switch to list the data set
                    385: 	    #    out in a warning?
                    386: 	}
                    387: 	push  @{$curves[-1]->{'data'}},\@data;
1.4       matthew   388: 	# This routine should never return anything.
                    389:     }
1.1       matthew   390:     return $result;
                    391: }
                    392: 
                    393: sub end_data {
                    394:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    395:     my $result = '';
1.4       matthew   396:     if ($target eq 'web') {
                    397: 	# This routine should never return anything.
                    398:     }
1.1       matthew   399:     return $result;
                    400: }
                    401: 
                    402: ##------------------------------------------------------------------- axis
                    403: sub start_axis {
                    404:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    405:     my $result='';
1.4       matthew   406:     if ($target eq 'web') {
1.17      matthew   407: 	&get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
                    408: 			$tagstack->[-1]);
1.4       matthew   409: 	# This routine should never return anything.
                    410:     }
1.1       matthew   411:     return $result;
                    412: }
                    413: 
                    414: sub end_axis {
                    415:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    416:     my $result = '';
1.4       matthew   417:     if ($target eq 'web') {
                    418: 	# This routine should never return anything.
                    419:     }
1.1       matthew   420:     return $result;
                    421: }
                    422: 
1.13      matthew   423: ##----------------------------------------------------------- set_defaults
                    424: sub set_defaults {
                    425:     my $var      = shift;
                    426:     my $defaults = shift;
                    427:     my $key;
                    428:     foreach $key (keys %$defaults) {
                    429: 	$var->{$key} = $defaults->{$key}->{'default'};
                    430:     }
                    431: }
                    432: 
1.1       matthew   433: ##------------------------------------------------------------------- misc
1.2       matthew   434: sub get_attributes{
1.10      matthew   435:     my $values   = shift;
                    436:     my $defaults = shift;
                    437:     my $parstack = shift;
                    438:     my $safeeval = shift;
                    439:     my $tag      = shift;
1.2       matthew   440:     my $attr;
1.10      matthew   441:     foreach $attr (keys %{$defaults}) {
                    442: 	$values->{$attr} = 
1.15      matthew   443: 	    &Apache::lonxml::get_param($attr,$parstack,$safeeval);
1.10      matthew   444: 	if ($values->{$attr} eq '' | !defined($values->{$attr})) {
1.11      matthew   445: 	    $values->{$attr} = $defaults->{$attr}->{'default'};
1.6       matthew   446: 	    next;
                    447: 	}
1.10      matthew   448: 	my $test = $defaults->{$attr}->{'test'};
                    449: 	if (! &$test($values->{$attr})) {
1.6       matthew   450: 	    &Apache::lonxml::warning
                    451: 		($tag.':'.$attr.': Bad value.'.'Replacing your value with : '
1.11      matthew   452: 		 .$defaults->{$attr}->{'default'} );
                    453: 	    $values->{$attr} = $defaults->{$attr}->{'default'};
1.10      matthew   454: 	}
1.2       matthew   455:     }
1.11      matthew   456:     return ;
1.6       matthew   457: }
1.15      matthew   458: ##------------------------------------------------------- write_gnuplot_file
1.6       matthew   459: sub write_gnuplot_file {
                    460:     my $gnuplot_input = '';
1.10      matthew   461:     my $curve;
1.6       matthew   462:     # Collect all the colors
                    463:     my @Colors;
                    464:     push @Colors, $plot{'bgcolor'};
                    465:     push @Colors, $plot{'fgcolor'}; 
1.13      matthew   466:     push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});
1.9       matthew   467:     foreach $curve (@curves) {
                    468: 	push @Colors, ($curve->{'color'} ne '' ? 
                    469: 		       $curve->{'color'}       : 
1.13      matthew   470: 		       $plot{'fgcolor'}        );
1.6       matthew   471:     }
                    472:     # set term
                    473:     $gnuplot_input .= 'set term gif ';
                    474:     $gnuplot_input .= 'transparent ' if ($plot{'transparent'} eq 'on');
                    475:     $gnuplot_input .= $plot{'font'} . ' ';
1.10      matthew   476:     $gnuplot_input .= 'size '.$plot{'width'}.','.$plot{'height'}.' ';
1.6       matthew   477:     $gnuplot_input .= "@Colors\n";
1.7       matthew   478:     # grid
1.10      matthew   479:     $gnuplot_input .= 'set grid'.$/ if ($plot{'grid'} eq 'on');
1.7       matthew   480:     # border
1.9       matthew   481:     $gnuplot_input .= ($plot{'border'} eq 'on'?
                    482: 		       'set border'.$/           :
                    483: 		       'set noborder'.$/         );    # title, xlabel, ylabel
1.13      matthew   484:     $gnuplot_input .= "set output\n";
                    485:     $gnuplot_input .= "set title  \"$title\"\n"  if (defined($title)) ;
                    486:     $gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
                    487:     $gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
                    488:     if (defined(%axis)) {
                    489: 	$gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
                    490: 	$gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
1.6       matthew   491:     }
                    492:     # Key
1.13      matthew   493:     if (defined(%key)) {
1.9       matthew   494: 	$gnuplot_input .= 'set key '.$key{'pos'}.' ';
                    495: 	if ($key{'title'} ne '') {
1.11      matthew   496: 	    $gnuplot_input .= 'title "'.$key{'title'}.'" ';
                    497: 	} 
                    498: 	$gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;
1.6       matthew   499:     } else {
1.9       matthew   500: 	$gnuplot_input .= 'set nokey'.$/;
1.13      matthew   501:     }
1.6       matthew   502:     # labels
1.10      matthew   503:     my $label;
1.6       matthew   504:     foreach $label (@labels) {
                    505: 	$gnuplot_input .= 'set label "'.$label->{'text'}.'" at '.
1.9       matthew   506: 	    $label->{'xpos'}.','.$label->{'ypos'}.' '.$label->{'justify'}.$/ ;
1.6       matthew   507:     }
                    508:     # curves
                    509:     $gnuplot_input .= 'plot ';
                    510:     my $datatext = '';
1.9       matthew   511:     for (my $i = 0;$i<=$#curves;$i++) {
                    512: 	$curve = $curves[$i];
                    513: 	$gnuplot_input.= ', ' if ($i > 0);
1.6       matthew   514: 	if (exists($curve->{'function'})) {
1.9       matthew   515: 	    $gnuplot_input.= 
                    516: 		$curve->{'function'}.' title "'.
                    517: 		$curve->{'name'}.'" with '.
                    518: 		$curve->{'linestyle'};
1.6       matthew   519: 	} elsif (exists($curve->{'data'})) {
1.9       matthew   520: 	    $gnuplot_input.= '\'-\' title "'.
                    521: 		$curve->{'name'}.'" with '.
                    522: 		$curve->{'linestyle'};
1.6       matthew   523: 	    my @Data = @{$curve->{'data'}};
1.9       matthew   524: 	    my @Data0 = @{$Data[0]};
                    525: 	    for (my $i =0; $i<=$#Data0; $i++) {
1.10      matthew   526: 		my $dataset;
1.6       matthew   527: 		foreach $dataset (@Data) {
1.9       matthew   528: 		    $datatext .= $dataset->[$i] . ' ';
1.6       matthew   529: 		}
1.9       matthew   530: 		$datatext .= $/;
1.6       matthew   531: 	    }
1.9       matthew   532: 	    $datatext .=$/;
1.6       matthew   533: 	}
                    534:     }
1.9       matthew   535:     $gnuplot_input .= $/.$datatext;
1.10      matthew   536:     return $gnuplot_input;
1.2       matthew   537: }
1.1       matthew   538: 
                    539: 1;
                    540: __END__
1.4       matthew   541: 
                    542: 
                    543: 
                    544: 
                    545: 

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