--- loncom/xml/lonplot.pm	2001/12/28 19:40:47	1.23
+++ loncom/xml/lonplot.pm	2007/10/09 22:11:51	1.131
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Dynamic plot
 #
-# $Id: lonplot.pm,v 1.23 2001/12/28 19:40:47 matthew Exp $
+# $Id: lonplot.pm,v 1.131 2007/10/09 22:11:51 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -25,20 +25,38 @@
 #
 # http://www.lon-capa.org/
 #
-# 12/15/01 Matthew
-# 12/17 12/18 12/19 12/20 12/21 12/27 12/28 Matthew
+
 package Apache::lonplot;
 
 use strict;
+use warnings FATAL=>'all';
+no warnings 'uninitialized';
 use Apache::File;
 use Apache::response;
 use Apache::lonxml;
 use Apache::edit;
+use Apache::lonnet;
+use LONCAPA;
+ 
+
+use vars qw/$weboutputformat $version/;
+
+
 
-sub BEGIN {
-  &Apache::lonxml::register('Apache::lonplot',('plot'));
+BEGIN {
+    &Apache::lonxml::register('Apache::lonplot',('gnuplot'));
+    #
+    # Determine the version of GNUPLOT
+    $weboutputformat = 'gif';
+    my $versionstring = `gnuplot --version 2>/dev/null`;
+    ($version) = ($versionstring =~ /^gnuplot ([\d.]+)/);
+    if ($version >= 4) {
+        $weboutputformat = 'png';
+    }
+    
 }
 
+
 ## 
 ## Description of data structures:
 ##
@@ -69,79 +87,255 @@ sub BEGIN {
 ##        Tests used in checking the validitity of input         ##
 ##                                                               ##
 ###################################################################
+
+my $max_str_len = 50;    # if a label, title, xlabel, or ylabel text
+                         # is longer than this, it will be truncated.
+
+my %linestyles = 
+    (
+     lines          => 2,     # Maybe this will be used in the future
+     linespoints    => 2,     # to check on whether or not they have 
+     dots	    => 2,     # supplied enough <data></data> fields
+     points         => 2,     # to use the given line style.  But for
+     steps	    => 2,     # now there are more important things 
+     fsteps	    => 2,     # for me to deal with.
+     histeps        => 2,
+     errorbars	    => 3,
+     xerrorbars	    => [3,4],
+     yerrorbars	    => [3,4],
+     xyerrorbars    => [4,6],
+     boxes          => 3,
+     filledcurves   => 2,
+     vector	    => 4
+    );		    
+
 my $int_test       = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};
 my $real_test      = 
     sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d*\.?\d*([eE][+-]\d+)?$/};
-my $color_test     = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-f]{6}$/};
+my $pos_real_test  =
+    sub {$_[0]=~s/\s+//g;$_[0]=~/^[+]?\d*\.?\d*([eE][+-]\d+)?$/};
+my $color_test     = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-fA-F]{6}$/};
 my $onoff_test     = sub {$_[0]=~/^(on|off)$/};
 my $key_pos_test   = sub {$_[0]=~/^(top|bottom|right|left|outside|below| )+$/};
-my $sml_test       = sub {$_[0]=~/^(small|medium|large)$/};
-my $linestyle_test = sub {$_[0]=~/^(lines|linespoints|dots|points|steps)$/};
-my $words_test     = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w\(\)]+ ?)+$/};
+my $sml_test       = sub {$_[0]=~/^(\d+|small|medium|large)$/};
+my $linestyle_test = sub {exists($linestyles{$_[0]})};
+my $words_test     = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w~!\@\#\$\%^&\*\(\)-=_\+\[\]\{\}:\;\'<>,\.\/\?\\]+ ?)+$/};
 
 ###################################################################
 ##                                                               ##
 ##                      Attribute metadata                       ##
 ##                                                               ##
 ###################################################################
-my %plot_defaults = 
+my @gnuplot_edit_order = 
+    qw/alttag bgcolor fgcolor height width texwidth fontface font texfont
+    transparent grid samples 
+    border align plotcolor plottype gridtype lmargin rmargin
+    tmargin bmargin major_ticscale minor_ticscale boxwidth gridlayer fillstyle
+    pattern solid/;
+
+my $margin_choices = ['default',0..20];
+
+my %gnuplot_defaults = 
     (
+     alttag       => {
+	 default     => 'dynamically generated plot',
+	 test        => $words_test,
+	 description => 'Brief description of the plot',
+      	 edit_type   => 'entry',
+	 size        => '40'
+	 },
      height       => {
-	 default     => 200,
+	 default     => 300,
 	 test        => $int_test,
-	 description => 'vertical size of image (pixels)',
-	 edit_type   => 'entry' 
+	 description => 'Height of image (pixels)',
+      	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      width        => {
-	 default     => 200,
+	 default     => 400,
 	 test        => $int_test,
-	 description => 'horizontal size of image (pixels)',
-	 edit_type   => 'entry'
+	 description => 'Width of image (pixels)',
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      bgcolor      => {
 	 default     => 'xffffff',
 	 test        => $color_test, 
-	 description => 'background color of image (xffffff)',
-	 edit_type   => 'entry'
+	 description => 'Background color of image (xffffff)',
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      fgcolor      => {
 	 default     => 'x000000',
 	 test        => $color_test,
-	 description => 'foreground color of image (x000000)',
-	 edit_type   => 'entry' 
+	 description => 'Foreground color of image (x000000)',
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      transparent  => {
 	 default     => 'off',
 	 test        => $onoff_test, 
-	 description => '',
-	 edit_type   => 'on_off'
+	 description => 'Transparent image',
+	 edit_type   => 'onoff'
 	 },
      grid         => {
+	 default     => 'on',
+	 test        => $onoff_test, 
+	 description => 'Display grid',
+	 edit_type   => 'onoff'
+	 },
+     gridlayer    => {
 	 default     => 'off',
 	 test        => $onoff_test, 
-	 description => '',
-	 edit_type   => 'on_off'
+	 description => 'Display grid front layer over filled boxes or filled curves',
+	 edit_type   => 'onoff'
+	 },
+     box_border   => {
+	 default     => 'noborder',
+	 test        => sub {$_[0]=~/^(noborder|border)$/},
+	 description => 'Draw border for boxes',
+	 edit_type   => 'choice',
+	 choices     => ['border','noborder']
 	 },
      border       => {
 	 default     => 'on',
 	 test        => $onoff_test, 
-	 description => '',
-	 edit_type   => 'on_off'
+	 description => 'Draw border around plot',
+	 edit_type   => 'onoff'
 	 },
      font         => {
-	 default     => 'medium',
+	 default     => '9',
 	 test        => $sml_test,
-	 description => 'Size of font to use',
+	 description => 'Font size to use in web output (pts)',
 	 edit_type   => 'choice',
-	 choices     => ['small','medium','large']
+	 choices     => [['5','5 (small)'],'6','7','8',['9','9 (medium)'],'10',['11','11 (large)'],'12','15']
+	 },
+     fontface     => {
+        default     => 'sans-serif',
+        test        => sub {$_[0]=~/^(sans-serif|serif|classic)$/},
+        description => 'Type of font to use',
+        edit_type   => 'choice',
+        choices     => ['sans-serif','serif', 'classic']
+        },
+     samples      => {
+	 default     => '100',
+	 test        => $int_test,
+	 description => 'Number of samples for non-data plots',
+	 edit_type   => 'choice',
+	 choices     => ['100','200','500','1000','2000','5000']
 	 },
      align        => {
-	 default     => 'left',
-	 test        => sub {$_[0]=~/^(left|right|center)$/},
-	 description => 'alignment for image in html',
+	 default     => 'middle',
+	 test        => sub {$_[0]=~/^(left|right|middle|center)$/},
+	 description => 'Alignment for image in HTML',
 	 edit_type   => 'choice',
-	 choices     => ['left','right','center']
-	 } 
+	 choices     => ['left','right','middle']
+	 },
+     texwidth     => {
+         default     => '93',
+         test        => $int_test,
+         description => 'Width of plot when printed (mm)',
+         edit_type   => 'entry',
+         size        => '5'
+         },
+     texfont      => {
+         default     => '22',
+         test        => $int_test,
+         description => 'Font size to use in TeX output (pts):',
+         edit_type   => 'choice',
+         choices     => [qw/8 10 12 14 16 18 20 22 24 26 28 30 32 34 36/],
+         },
+     plotcolor    => {
+         default     => 'monochrome',
+         test        => sub {$_[0]=~/^(monochrome|color|colour)$/},
+         description => 'Color setting for printing:',
+         edit_type   => 'choice',
+         choices     => [qw/monochrome color colour/],
+         },
+     pattern      => {
+	 default     => '',
+	 test        => $int_test,
+	 description => 'Pattern value for boxes:',
+	 edit_type   => 'choice',
+         choices     => [0,1,2,3,4,5,6]
+         },
+     solid        => {
+         default     => 0,
+         test        => $real_test,
+         description => 'The density of fill style for boxes',
+         edit_type   => 'entry',
+         size        => '5'
+         },
+     fillstyle    => {
+	 default     => 'empty',
+	 test        => sub {$_[0]=~/^(empty|solid|pattern)$/},
+	 description => 'Filled style for boxes:',
+	 edit_type   => 'choice',
+         choices     => ['empty','solid','pattern']
+         },
+     plottype     => {
+	 default     => 'Cartesian',
+	 test        => sub {$_[0]=~/^(Polar|Cartesian)$/},
+	 description => 'Plot type:',
+	 edit_type   => 'choice',
+         choices     => ['Cartesian','Polar']
+         },
+     gridtype     => {
+	 default     => 'Cartesian',
+	 test        => sub {$_[0]=~/^(Polar|Cartesian|Linear-Log|Log-Linear|Log-Log)$/},
+	 description => 'Grid type:',
+	 edit_type   => 'choice',
+         choices     => ['Cartesian','Polar','Linear-Log','Log-Linear','Log-Log']
+         },
+     lmargin      => {
+	 default     => 'default',
+	 test        => sub {$_[0]=~/^(default|\d+)$/},
+	 description => 'Left margin width (pts):',
+	 edit_type   => 'choice',
+         choices     => $margin_choices,
+         },
+     rmargin      => {
+	 default     => 'default',
+	 test        => sub {$_[0]=~/^(default|\d+)$/},
+	 description => 'Right margin width (pts):',
+	 edit_type   => 'choice',
+         choices     => $margin_choices,
+         },
+     tmargin      => {
+	 default     => 'default',
+	 test        => sub {$_[0]=~/^(default|\d+)$/},
+	 description => 'Top margin width (pts):',
+	 edit_type   => 'choice',
+         choices     => $margin_choices,
+         },
+     bmargin      => {
+	 default     => 'default',
+	 test        => sub {$_[0]=~/^(default|\d+)$/},
+	 description => 'Bottom margin width (pts):',
+	 edit_type   => 'choice',
+         choices     => $margin_choices,
+         },
+     boxwidth     => {
+	 default     => '',
+	 test        => $real_test, 
+	 description => 'Width of boxes, default is auto',
+	 edit_type   => 'entry',
+         size        => '5'
+         },
+     major_ticscale  => {
+         default     => '1',
+         test        => $real_test,
+         description => 'Size of major tic marks (plot coordinates)',
+         edit_type   => 'entry',
+         size        => '5'
+         },
+     minor_ticscale  => {
+         default     => '0.5',
+         test        => $real_test,
+         description => 'Size of minor tic mark (plot coordinates)',
+         edit_type   => 'entry',
+         size        => '5'
+         },
      );
 
 my %key_defaults = 
@@ -150,18 +344,19 @@ my %key_defaults =
 	 default => '',
 	 test => $words_test,
 	 description => 'Title of key',
-	 edit_type   => 'entry'
+	 edit_type   => 'entry',
+	 size        => '40'
 	 },
      box   => { 
 	 default => 'off',
 	 test => $onoff_test,
 	 description => 'Draw a box around the key?',
-	 edit_type   => 'on_off'
+	 edit_type   => 'onoff'
 	 },
      pos   => { 
 	 default => 'top right', 
 	 test => $key_pos_test, 
-	 description => 'position of the key on the plot',
+	 description => 'Position of the key on the plot',
 	 edit_type   => 'choice',
 	 choices     => ['top left','top right','bottom left','bottom right',
 			 'outside','below']
@@ -173,14 +368,16 @@ my %label_defaults =
      xpos    => {
 	 default => 0,
 	 test => $real_test,
-	 description => 'x position of label (graph coordinates)',
-	 edit_type   => 'entry'
+	 description => 'X position of label (graph coordinates)',
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      ypos    => {
 	 default => 0, 
 	 test => $real_test,
-	 description => 'y position of label (graph coordinates)',
-	 edit_type   => 'entry'
+	 description => 'Y position of label (graph coordinates)',
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      justify => {
 	 default => 'left',    
@@ -191,68 +388,146 @@ my %label_defaults =
      }
      );
 
+my @tic_edit_order = ('location','mirror','start','increment','end',
+                      'minorfreq');
+my %tic_defaults =
+    (
+     location => {
+	 default => 'border', 
+	 test => sub {$_[0]=~/^(border|axis)$/},
+	 description => 'Location of major tic marks',
+	 edit_type   => 'choice',
+	 choices     => ['border','axis']
+	 },
+     mirror => {
+	 default => 'on', 
+	 test => $onoff_test,
+	 description => 'Mirror tics on opposite axis?',
+	 edit_type   => 'onoff'
+	 },
+     start => {
+	 default => '-10.0',
+	 test => $real_test,
+	 description => 'Start major tics at',
+	 edit_type   => 'entry',
+	 size        => '10'
+	 },
+     increment => {
+	 default => '1.0',
+	 test => $real_test,
+	 description => 'Place a major tic every',
+	 edit_type   => 'entry',
+	 size        => '10'
+	 },
+     end => {
+	 default => ' 10.0',
+	 test => $real_test,
+	 description => 'Stop major tics at ',
+	 edit_type   => 'entry',
+	 size        => '10'
+	 },
+     minorfreq => {
+	 default => '0',
+	 test => $int_test,
+	 description => 'Number of minor tics per major tic mark',
+	 edit_type   => 'entry',
+	 size        => '10'
+	 },         
+     );
+
+my @axis_edit_order = ('color','xmin','xmax','ymin','ymax');
 my %axis_defaults = 
     (
-     color     => {
+     color   => {
 	 default => 'x000000', 
 	 test => $color_test,
-	 description => 'color of axes (x000000)',
-	 edit_type   => 'entry'
+	 description => 'Color of grid lines (x000000)',
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      xmin      => {
 	 default => '-10.0',
 	 test => $real_test,
-	 description => 'minimum x-value shown in plot',
-	 edit_type   => 'entry'
+	 description => 'Minimum x-value shown in plot',
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      xmax      => {
 	 default => ' 10.0',
 	 test => $real_test,
-	 description => 'maximum x-value shown in plot',	 
-	 edit_type   => 'entry'
+	 description => 'Maximum x-value shown in plot',	 
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      ymin      => {
 	 default => '-10.0',
 	 test => $real_test,
-	 description => 'minimum y-value shown in plot',	 
-	 edit_type   => 'entry'
+	 description => 'Minimum y-value shown in plot',	 
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      ymax      => {
 	 default => ' 10.0',
 	 test => $real_test,
-	 description => 'maximum y-value shown in plot',	 
-	 edit_type   => 'entry'
-	 },
-     linestyle => {
-	 default => 'points',
-	 test => $linestyle_test,
-	 description => 'Style of the axis lines',
-	 edit_type   => 'choice',
-	 choices     => ['lines','linespoints','dots','points']
+	 description => 'Maximum y-value shown in plot',	 
+	 edit_type   => 'entry',
+	 size        => '10'
 	 }
      );
 
+my @curve_edit_order = ('color','name','linestyle','linewidth','pointtype','pointsize','limit');
+
 my %curve_defaults = 
     (
      color     => {
 	 default => 'x000000',
 	 test => $color_test,
-	 description => 'color of curve (x000000)',
-	 edit_type   => 'entry'
+	 description => 'Color of curve (x000000)',
+	 edit_type   => 'entry',
+	 size        => '10'
 	 },
      name      => {
 	 default => '',
 	 test => $words_test,
-	 description => 'name of curve to appear in key',
-	 edit_type   => 'entry'
+	 description => 'Name of curve to appear in key',
+	 edit_type   => 'entry',
+	 size        => '20'
 	 },
      linestyle => {
 	 default => 'lines',
 	 test => $linestyle_test,
-	 description => 'Style of the axis lines',
+	 description => 'Line style',
 	 edit_type   => 'choice',
-	 choices     => ['lines','linespoints','dots','points','steps']
-	 }
+	 choices     => [keys(%linestyles)]
+	 },
+     linewidth => {
+         default     => 1,
+         test        => $int_test,
+         description => 'Line width (may not apply to all line styles)',
+         edit_type   => 'choice',
+         choices     => [1,2,3,4,5,6,7,8,9,10]
+         },
+     pointsize => {
+         default     => 1,
+         test        => $pos_real_test,
+         description => 'Point size (may not apply to all line styles)',
+         edit_type   => 'entry',
+         size        => '5'
+         },
+     pointtype => {
+         default     => 1,
+         test        => $int_test,
+         description => 'Point type (may not apply to all line styles)',
+         edit_type   => 'choice',
+         choices     => [0,1,2,3,4,5,6]
+         },
+     limit     => {
+         default     => 'closed',
+	 test        => sub {$_[0]=~/^(closed|x1|x2|y1|y2)$/},
+         description => 'Point to fill -- for filledcurves',
+         edit_type   => 'choice',
+         choices     => ['closed','x1','x2','y1','y2']
+         },
      );
 
 ###################################################################
@@ -260,87 +535,213 @@ my %curve_defaults =
 ##                    parsing and edit rendering                 ##
 ##                                                               ##
 ###################################################################
-my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves);
 
-sub start_plot {
-    %plot    = ();      %key     = ();      %axis   = (); 
-    $title   = undef;   $xlabel  = undef;   $ylabel = undef;
-    $#labels = -1;      $#curves = -1;
+undef %Apache::lonplot::plot;
+my (%key,%axis,$title,$xlabel,$ylabel,@labels,@curves,%xtics,%ytics);
+
+sub start_gnuplot {
+    undef(%Apache::lonplot::plot);   undef(%key);    undef(%axis);
+    undef($title);  undef($xlabel); undef($ylabel);
+    undef(@labels); undef(@curves);
+    undef(%xtics);  undef(%ytics);
     #
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
-	&Apache::lonxml::register('Apache::lonplot',
-	      ('title','xlabel','ylabel','key','axis','label','curve'));
-	push (@Apache::lonxml::namespace,'plot');
-	## Always evaluate the insides of the <plot></plot> tags
-	my $inside = &Apache::lonxml::get_all_text("/plot",$$parser[-1]);
-	$inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
-	&Apache::lonxml::newparser($parser,\$inside);
-	##-------------------------------------------------------
-	&get_attributes(\%plot,\%plot_defaults,$parstack,$safeeval,
+    &Apache::lonxml::register('Apache::lonplot',
+	     ('title','xlabel','ylabel','key','axis','label','curve',
+	      'xtics','ytics'));
+    push (@Apache::lonxml::namespace,'lonplot');
+    if ($target eq 'web' || $target eq 'tex') {
+	&get_attributes(\%Apache::lonplot::plot,\%gnuplot_defaults,$parstack,$safeeval,
 			$tagstack->[-1]);
     } elsif ($target eq 'edit') {
-	$result .= &Apache::edit::tag_start($target,$token);
-	$result .= &edit_attributes($target,$token,\%plot_defaults);
+	$result .= &Apache::edit::tag_start($target,$token,'GnuPlot');
+	$result .= &edit_attributes($target,$token,\%gnuplot_defaults,
+				    \@gnuplot_edit_order)
+	    .&Apache::edit::end_row()
+	    .&Apache::edit::start_spanning_row();
     } elsif ($target eq 'modified') {
 	my $constructtag=&Apache::edit::get_new_args
-	    ($token,$parstack,$safeeval,keys %plot_defaults);
+	    ($token,$parstack,$safeeval,keys(%gnuplot_defaults));
 	if ($constructtag) {
 	    $result = &Apache::edit::rebuild_tag($token);
-	    $result.= &Apache::edit::handle_insert();
 	}
     }
     return $result;
 }
 
-sub end_plot {
+sub end_gnuplot {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     pop @Apache::lonxml::namespace;
     &Apache::lonxml::deregister('Apache::lonplot',
 	('title','xlabel','ylabel','key','axis','label','curve'));
     my $result = '';
-    if ($target eq 'web') {
+    my $randnumber;
+    # need to call rand everytime start_script would evaluate, as the
+    # safe space rand number generator and the global rand generator 
+    # are not separate
+    if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
+	$target eq 'answer') {
+      $randnumber=int(rand(1000));
+    }
+    if ($target eq 'web' || $target eq 'tex') {
 	&check_inputs(); # Make sure we have all the data we need
 	##
 	## Determine filename
 	my $tmpdir = '/home/httpd/perl/tmp/';
-	my $filename = $ENV{'user.name'}.'_'.$ENV{'user.domain'}.
-	    '_'.time.'_'.$$.'_plot.data';
+	my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
+	    '_'.time.'_'.$$.$randnumber.'_plot';
 	## Write the plot description to the file
-	my $fh=Apache::File->new(">$tmpdir$filename");
-	print $fh &write_gnuplot_file();
-	close($fh);
+	&write_gnuplot_file($tmpdir,$filename,$target);
+	$filename = &escape($filename);
 	## return image tag for the plot
-	$result .= <<"ENDIMAGE";
-<img src    = "/cgi-bin/plot.gif?$filename" 
-     width  = "$plot{'width'}" 
-     height = "$plot{'height'}"
-     align  = "$plot{'align'}"
-     alt    = "/cgi-bin/plot.gif?$filename" />
+	if ($target eq 'web') {
+	    $result .= <<"ENDIMAGE";
+<img src    = "/cgi-bin/plot.$weboutputformat?file=$filename.data" 
+     width  = "$Apache::lonplot::plot{'width'}"
+     height = "$Apache::lonplot::plot{'height'}"
+     align  = "$Apache::lonplot::plot{'align'}"
+     alt    = "$Apache::lonplot::plot{'alttag'}" />
 ENDIMAGE
+        } elsif ($target eq 'tex') {
+	    &Apache::lonxml::debug(" gnuplot wid = $Apache::lonplot::plot{'width'}");
+	    &Apache::lonxml::debug(" gnuplot ht  = $Apache::lonplot::plot{'height'}");
+	    #might be inside the safe space, register the URL for later
+	    &Apache::lonxml::register_ssi("/cgi-bin/plot.gif?file=$filename.data&output=eps");
+	    $result  = "%DYNAMICIMAGE:$Apache::lonplot::plot{'width'}:$Apache::lonplot::plot{'height'}:$Apache::lonplot::plot{'texwidth'}\n";
+	    $result .= '\graphicspath{{/home/httpd/perl/tmp/}}'."\n";
+	    $result .= '\includegraphics[width='.$Apache::lonplot::plot{'texwidth'}.' mm]{'.&unescape($filename).'.eps}';
+	}
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
 
+
+##--------------------------------------------------------------- xtics
+sub start_xtics {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result='';
+    if ($target eq 'web' || $target eq 'tex') {
+	&get_attributes(\%xtics,\%tic_defaults,$parstack,$safeeval,
+		    $tagstack->[-1]);
+    } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::tag_start($target,$token,'xtics');
+	$result .= &edit_attributes($target,$token,\%tic_defaults,
+				    \@tic_edit_order);
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args
+	    ($token,$parstack,$safeeval,keys(%tic_defaults));
+	if ($constructtag) {
+	    $result = &Apache::edit::rebuild_tag($token);
+	}
+    }
+    return $result;
+}
+
+sub end_xtics {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result = '';
+    if ($target eq 'web' || $target eq 'tex') {
+    } elsif ($target eq 'edit') {
+	$result.=&Apache::edit::tag_end($target,$token);
+    }
+    return $result;
+}
+
+##--------------------------------------------------------------- ytics
+sub start_ytics {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result='';
+    if ($target eq 'web' || $target eq 'tex') {
+	&get_attributes(\%ytics,\%tic_defaults,$parstack,$safeeval,
+		    $tagstack->[-1]);
+    } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::tag_start($target,$token,'ytics');
+	$result .= &edit_attributes($target,$token,\%tic_defaults,
+				    \@tic_edit_order);
+    } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args
+	    ($token,$parstack,$safeeval,keys(%tic_defaults));
+	if ($constructtag) {
+	    $result = &Apache::edit::rebuild_tag($token);
+	}
+    }
+    return $result;
+}
+
+sub end_ytics {
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result = '';
+    if ($target eq 'web' || $target eq 'tex') {
+    } elsif ($target eq 'edit') {
+	$result.=&Apache::edit::tag_end($target,$token);
+    }
+    return $result;
+}
+
+##-----------------------------------------------------------------font
+my %font_properties =
+    (
+     'classic'    => {
+	 face       => 'classic',
+	 file       => 'DejaVuSansMono-Bold',
+	 printname  => 'Helvetica',
+	 tex_no_file => 1,
+     },
+     'sans-serif' => {
+	 face       => 'sans-serif',
+	 file       => 'DejaVuSans',
+	 printname  => 'DejaVuSans',
+     },
+     'serif'      => {
+	 face       => 'serif',
+	 file       => 'DejaVuSerif',
+	 printname  => 'DejaVuSerif',
+     },
+     );
+
+sub get_font {
+    my ($target) = @_;
+    my ($size, $selected_font);
+
+    if ( $Apache::lonplot::plot{'font'} =~ /^(small|medium|large)/) {
+	$selected_font = $font_properties{'classic'};
+	if ( $Apache::lonplot::plot{'font'} eq 'small') {
+	    $size = '5';
+	} elsif ( $Apache::lonplot::plot{'font'} eq 'medium') {
+	    $size = '9';
+	} elsif ( $Apache::lonplot::plot{'font'} eq 'large') {
+	    $size = '11';
+	} else {
+	    $size = '9';
+	}
+    } else {
+	$size = $Apache::lonplot::plot{'font'};
+	$selected_font = $font_properties{$Apache::lonplot::plot{'fontface'}};
+    }
+    if ($target eq 'tex' && defined($Apache::lonplot::plot{'texfont'})) {
+	$size = $Apache::lonplot::plot{'texfont'};
+    }
+    return ($size, $selected_font);
+}
+
 ##----------------------------------------------------------------- key
 sub start_key {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
 	&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
 		    $tagstack->[-1]);
     } elsif ($target eq 'edit') {
-	$result .= &Apache::edit::tag_start($target,$token);
+	$result .= &Apache::edit::tag_start($target,$token,'Plot Key');
 	$result .= &edit_attributes($target,$token,\%key_defaults);
     } elsif ($target eq 'modified') {
 	my $constructtag=&Apache::edit::get_new_args
-	    ($token,$parstack,$safeeval,keys %key_defaults);
+	    ($token,$parstack,$safeeval,keys(%key_defaults));
 	if ($constructtag) {
 	    $result = &Apache::edit::rebuild_tag($token);
-	    $result.= &Apache::edit::handle_insert();
 	}
     }
     return $result;
@@ -349,28 +750,73 @@ sub start_key {
 sub end_key {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
 
+sub parse_label {
+    my ($target,$text) = @_;
+    my $parser=HTML::LCParser->new(\$text);
+    my $result;
+    while (my $token=$parser->get_token) {
+	if ($token->[0] eq 'S') {
+	    if ($token->[1] eq 'sub') {
+		$result .= '_{';
+	    } elsif ($token->[1] eq 'sup') {
+		$result .= '^{';
+	    } else {
+		$result .= $token->[4];
+	    }
+	} elsif ($token->[0] eq 'E') {
+	    if ($token->[1] eq 'sub'
+		|| $token->[1] eq 'sup') {
+		$result .= '}';
+	    } else {
+		$result .= $token->[2];
+	    }
+	} elsif ($token->[0] eq 'T') {
+	    $result .= &replace_entities($target,$token->[1]);
+	}
+    }
+    return $result;
+}
+
+
+my %lookup = 
+    ('(pi|#960)' => {'tex' => '{/Symbol p}', 'web' => "\x{3C0}"},);
+
+sub replace_entities {
+    my ($target,$text) = @_;
+    $text =~ s{([_^~\{\}]|\\\\)}{\\\\$1}g;
+    while (my ($re, $replace) = each(%lookup)) {
+	$text =~ s/&$re;/$replace->{$target}/g;
+    }
+    $text =~ s{(&)}{\\\\$1}g;
+    return $text;
+}
+
 ##------------------------------------------------------------------- title
 sub start_title {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
-	$title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
+    if ($target eq 'web' || $target eq 'tex') {
+	$title = &Apache::lonxml::get_all_text("/title",$parser,$style);
+	$title=&Apache::run::evaluate($title,$safeeval,$$parstack[-1]);
+	$title =~ s/\n/ /g;
+	if (length($title) > $max_str_len) {
+	    $title = substr($title,0,$max_str_len);
+	}
+	$title = &parse_label($target,$title);
     } elsif ($target eq 'edit') {
-	$result.=&Apache::edit::tag_start($target,$token);
-	my $text=&Apache::lonxml::get_all_text("/title",$$parser[-1]);
-	$result.='</td></tr><tr><td colspan="3">'.
-	    &Apache::edit::editfield('',$text,'',20,1).
-	    &Apache::edit::end_table();
+	$result.=&Apache::edit::tag_start($target,$token,'Plot Title');
+	my $text=&Apache::lonxml::get_all_text("/title",$parser,$style);
+	$result.=&Apache::edit::editline('',$text,'',60);
     } elsif ($target eq 'modified') {
-	my $text=$$parser[-1]->get_text("/function");
-	$result.=&Apache::edit::modifiedfield($token);
+	$result.=&Apache::edit::rebuild_tag($token);
+	$result.=&Apache::edit::modifiedfield("/title",$parser);
     }
     return $result;
 }
@@ -378,7 +824,7 @@ sub start_title {
 sub end_title {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_end($target,$token);
     }
@@ -388,17 +834,21 @@ sub end_title {
 sub start_xlabel {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
-	$xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
+    if ($target eq 'web' || $target eq 'tex') {
+	$xlabel = &Apache::lonxml::get_all_text("/xlabel",$parser,$style);
+	$xlabel=&Apache::run::evaluate($xlabel,$safeeval,$$parstack[-1]);
+	$xlabel =~ s/\n/ /g;
+	if (length($xlabel) > $max_str_len) {
+	    $xlabel = substr($xlabel,0,$max_str_len);
+	}
+	$xlabel = &parse_label($target,$xlabel);
     } elsif ($target eq 'edit') {
-	$result.=&Apache::edit::tag_start($target,$token);
-	my $text=&Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
-	$result.='</td></tr><tr><td colspan="3">'.
-	    &Apache::edit::editfield('',$text,'',20,1).
-	    &Apache::edit::end_table();
+	$result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
+	my $text=&Apache::lonxml::get_all_text("/xlabel",$parser,$style);
+	$result.=&Apache::edit::editline('',$text,'',60);
     } elsif ($target eq 'modified') {
-	my $text=$$parser[-1]->get_text("/function");
-	$result.=&Apache::edit::modifiedfield($token);
+	$result.=&Apache::edit::rebuild_tag($token);	
+	$result.=&Apache::edit::modifiedfield("/xlabel",$parser);
     }
     return $result;
 }
@@ -406,7 +856,7 @@ sub start_xlabel {
 sub end_xlabel {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_end($target,$token);
     }
@@ -417,17 +867,21 @@ sub end_xlabel {
 sub start_ylabel {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
-	$ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
+    if ($target eq 'web' || $target eq 'tex') {
+	$ylabel = &Apache::lonxml::get_all_text("/ylabel",$parser,$style);
+	$ylabel = &Apache::run::evaluate($ylabel,$safeeval,$$parstack[-1]);
+	$ylabel =~ s/\n/ /g;
+	if (length($ylabel) > $max_str_len) {
+	    $ylabel = substr($ylabel,0,$max_str_len);
+	}
+	$ylabel = &parse_label($target,$ylabel);
     } elsif ($target eq 'edit') {
-	$result .= &Apache::edit::tag_start($target,$token);
-	my $text = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
-	$result .= '</td></tr><tr><td colspan="3">'.
-	    &Apache::edit::editfield('',$text,'',20,1).
-	    &Apache::edit::end_table();
+	$result .= &Apache::edit::tag_start($target,$token,'Plot Ylabel');
+	my $text = &Apache::lonxml::get_all_text("/ylabel",$parser,$style);
+	$result .= &Apache::edit::editline('',$text,'',60);
     } elsif ($target eq 'modified') {
-	my $text=$$parser[-1]->get_text("/function");
-	$result.=&Apache::edit::modifiedfield($token);
+	$result.=&Apache::edit::rebuild_tag($token);
+	$result.=&Apache::edit::modifiedfield("/ylabel",$parser);
     }
     return $result;
 }
@@ -435,7 +889,7 @@ sub start_ylabel {
 sub end_ylabel {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_end($target,$token);
     }
@@ -446,32 +900,28 @@ sub end_ylabel {
 sub start_label {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
 	my %label;
 	&get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
 		    $tagstack->[-1]);
-	$label{'text'} = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
-	if (! &$words_test($label{'text'})) {
-	    # I should probably warn about it, too.
-	    $label{'text'} = 'Illegal text';
-	}
+	my $text = &Apache::lonxml::get_all_text("/label",$parser,$style);
+	$text = &Apache::run::evaluate($text,$safeeval,$$parstack[-1]);
+	$text =~ s/\n/ /g;
+	$text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
+	$label{'text'} = &parse_label($target,$text);
 	push(@labels,\%label);
     } elsif ($target eq 'edit') {
-	$result .= &Apache::edit::tag_start($target,$token);
+	$result .= &Apache::edit::tag_start($target,$token,'Plot Label');
 	$result .= &edit_attributes($target,$token,\%label_defaults);
-	my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
-	$result .= '</td></tr><tr><td colspan="3">'.
-	    &Apache::edit::editfield('',$text,'',20,1).
-	    &Apache::edit::end_table();
+	my $text = &Apache::lonxml::get_all_text("/label",$parser,$style);
+	$result .= &Apache::edit::end_row().
+	    &Apache::edit::start_spanning_row().
+	    &Apache::edit::editline('',$text,'',60);
     } elsif ($target eq 'modified') {
-	my $constructtag=&Apache::edit::get_new_args
-	    ($token,$parstack,$safeeval,keys %label_defaults);
-	if ($constructtag) {
-	    $result = &Apache::edit::rebuild_tag($token);
-	    $result.= &Apache::edit::handle_insert();
-	}
-	my $text=$$parser[-1]->get_text("/label");
-	$result.=&Apache::edit::modifiedfield($token);
+	&Apache::edit::get_new_args
+	    ($token,$parstack,$safeeval,keys(%label_defaults));
+	$result.=&Apache::edit::rebuild_tag($token);
+	$result.=&Apache::edit::modifiedfield("/label",$parser);
     }
     return $result;
 }
@@ -479,7 +929,7 @@ sub start_label {
 sub end_label {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_end($target,$token);
     }
@@ -490,22 +940,25 @@ sub end_label {
 sub start_curve {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
+    &Apache::lonxml::register('Apache::lonplot',('function','data'));
+    push (@Apache::lonxml::namespace,'curve');
+    if ($target eq 'web' || $target eq 'tex') {
 	my %curve;
 	&get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
 		    $tagstack->[-1]);
 	push (@curves,\%curve);
-	&Apache::lonxml::register('Apache::lonplot',('function','data'));
-	push (@Apache::lonxml::namespace,'curve');
     } elsif ($target eq 'edit') {
-	$result .= &Apache::edit::tag_start($target,$token);
-	$result .= &edit_attributes($target,$token,\%curve_defaults);
+	$result .= &Apache::edit::tag_start($target,$token,'Curve');
+	$result .= &edit_attributes($target,$token,\%curve_defaults,
+                                    \@curve_edit_order)
+	    .&Apache::edit::end_row()
+	    .&Apache::edit::start_spanning_row();
+
     } elsif ($target eq 'modified') {
 	my $constructtag=&Apache::edit::get_new_args
-	    ($token,$parstack,$safeeval,keys %label_defaults);
+	    ($token,$parstack,$safeeval,keys(%curve_defaults));
 	if ($constructtag) {
 	    $result = &Apache::edit::rebuild_tag($token);
-	    $result.= &Apache::edit::handle_insert();
 	}
     }
     return $result;
@@ -514,9 +967,9 @@ sub start_curve {
 sub end_curve {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
-	pop @Apache::lonxml::namespace;
-	&Apache::lonxml::deregister('Apache::lonplot',('function','data'));
+    pop @Apache::lonxml::namespace;
+    &Apache::lonxml::deregister('Apache::lonplot',('function','data'));
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_end($target,$token);
     }
@@ -527,24 +980,26 @@ sub end_curve {
 sub start_function {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
 	if (exists($curves[-1]->{'data'})) {
-	    &Apache::lonxml::warning('Use of <function> precludes use of <data>.  The <data> will be omitted in favor of the <function> declaration.');
+	    &Apache::lonxml::warning
+                ('Use of the <b>curve function</b> tag precludes use of '.
+                 ' the <b>curve data</b> tag.  '.
+                 'The curve data tag will be omitted in favor of the '.
+                 'curve function declaration.');
 	    delete $curves[-1]->{'data'} ;
 	}
-	$curves[-1]->{'function'} = 
-	    &Apache::lonxml::get_all_text("/function",$$parser[-1]);
+        my $function = &Apache::lonxml::get_all_text("/function",$parser,
+						     $style);
+	$function = &Apache::run::evaluate($function,$safeeval,$$parstack[-1]);
+	$curves[-1]->{'function'} = $function; 
     } elsif ($target eq 'edit') {
-	$result .= &Apache::edit::tag_start($target,$token);
-	my $text = &Apache::lonxml::get_all_text("/function",$$parser[-1]);
-	$result .= '</td></tr><tr><td colspan="3">'.
-	    &Apache::edit::editfield('',$text,'',20,1).
-	    &Apache::edit::end_table();
-
+	$result .= &Apache::edit::tag_start($target,$token,'Gnuplot compatible curve function');
+	my $text = &Apache::lonxml::get_all_text("/function",$parser,$style);
+	$result .= &Apache::edit::editline('',$text,'',60);
     } elsif ($target eq 'modified') {
-	# Why do I do this?
-	my $text=$$parser[-1]->get_text("/function");
-	$result.=&Apache::edit::modifiedfield($token);
+	$result.=&Apache::edit::rebuild_tag($token);
+	$result.=&Apache::edit::modifiedfield("/function",$parser);
     }
     return $result;
 }
@@ -552,8 +1007,9 @@ sub start_function {
 sub end_function {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::end_table();
     }
     return $result;
 }
@@ -562,50 +1018,63 @@ sub end_function {
 sub start_data {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
 	if (exists($curves[-1]->{'function'})) {
-	    &Apache::lonxml::warning('Use of <data> precludes use of .'.
-	    '<function>.  The <function> will be omitted in favor of '.
-            'the <data> declaration.');
+	    &Apache::lonxml::warning
+                ('Use of the <b>curve function</b> tag precludes use of '.
+                 ' the <b>curve data</b> tag.  '.
+                 'The curve function tag will be omitted in favor of the '.
+                 'curve data declaration.');
 	    delete($curves[-1]->{'function'});
 	}
-	my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
-	$datatext =~ s/\s+/ /g;  
+	my $datatext = &Apache::lonxml::get_all_text("/data",$parser,$style);
+	$datatext=&Apache::run::evaluate($datatext,$safeeval,$$parstack[-1]);
+	# Deal with cases where we're given an array...
+	if ($datatext =~ /^\@/) {
+	    $datatext = &Apache::run::run('return "'.$datatext.'"',
+					  $safeeval,1);
+	}
+	$datatext =~ s/\s+/ /g;
 	# Need to do some error checking on the @data array - 
 	# make sure it's all numbers and make sure each array 
 	# is of the same length.
 	my @data;
-	if ($datatext =~ /,/) {
+	if ($datatext =~ /,/) { # comma deliminated
 	    @data = split /,/,$datatext;
-	} else { # Assume it's space seperated.
+	} else { # Assume it's space separated.
 	    @data = split / /,$datatext;
 	}
 	for (my $i=0;$i<=$#data;$i++) {
 	    # Check that it's non-empty
 	    if (! defined($data[$i])) {
 		&Apache::lonxml::warning(
-		    'undefined <data> value.  Replacing with '.
+		    'undefined curve data value.  Replacing with '.
 		    ' pi/e = 1.15572734979092');
 		$data[$i] = 1.15572734979092;
 	    }
 	    # Check that it's a number
 	    if (! &$real_test($data[$i]) & ! &$int_test($data[$i])) {
 		&Apache::lonxml::warning(
-		    'Bad <data> value of '.$data[$i].'  Replacing with '.
+		    'Bad curve data value of '.$data[$i].'  Replacing with '.
 		    ' pi/e = 1.15572734979092');
 		$data[$i] = 1.15572734979092;
 	    }
 	}
+	# complain if the number of data points is not the same as
+	# in previous sets of data.
+	if (($curves[-1]->{'data'}) && ($#data != $#{@{$curves[-1]->{'data'}->[0]}})){
+	    &Apache::lonxml::warning
+		('Number of data points is not consistent with previous '.
+		 'number of data points');
+	}
 	push  @{$curves[-1]->{'data'}},\@data;
     } elsif ($target eq 'edit') {
-	$result .= &Apache::edit::tag_start($target,$token);
-	my $text = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
-	$result .= '</td></tr><tr><td colspan="3">'.
-	    &Apache::edit::editfield('',$text,'',20,1).
-	    &Apache::edit::end_table();
+	$result .= &Apache::edit::tag_start($target,$token,'Comma or space deliminated curve data');
+	my $text = &Apache::lonxml::get_all_text("/data",$parser,$style);
+	$result .= &Apache::edit::editline('',$text,'',60);
     } elsif ($target eq 'modified') {
-	my $text=$$parser[-1]->get_text("/data");
-	$result.=&Apache::edit::modifiedfield($token);
+	$result.=&Apache::edit::rebuild_tag($token);
+	$result.=&Apache::edit::modifiedfield("/data",$parser);
     }
     return $result;
 }
@@ -613,8 +1082,9 @@ sub start_data {
 sub end_data {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::end_table();
     }
     return $result;
 }
@@ -623,13 +1093,19 @@ sub end_data {
 sub start_axis {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
 	&get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
 			$tagstack->[-1]);
     } elsif ($target eq 'edit') {
-	$result .= &Apache::edit::tag_start($target,$token);
-	$result .= &edit_attributes($target,$token,\%axis_defaults);
+	$result .= &Apache::edit::tag_start($target,$token,'Plot Axes');
+	$result .= &edit_attributes($target,$token,\%axis_defaults,
+				    \@axis_edit_order);
     } elsif ($target eq 'modified') {
+	my $constructtag=&Apache::edit::get_new_args
+	    ($token,$parstack,$safeeval,keys(%axis_defaults));
+	if ($constructtag) {
+	    $result = &Apache::edit::rebuild_tag($token);
+	}
     }
     return $result;
 }
@@ -637,16 +1113,10 @@ sub start_axis {
 sub end_axis {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
-    if ($target eq 'web') {
+    if ($target eq 'web' || $target eq 'tex') {
     } elsif ($target eq 'edit') {
 	$result.=&Apache::edit::tag_end($target,$token);
     } elsif ($target eq 'modified') {
-	my $constructtag=&Apache::edit::get_new_args
-	    ($token,$parstack,$safeeval,keys %axis_defaults);
-	if ($constructtag) {
-	    $result = &Apache::edit::rebuild_tag($token);
-	    $result.= &Apache::edit::handle_insert();
-	}
     }
     return $result;
 }
@@ -661,7 +1131,7 @@ sub end_axis {
 sub set_defaults {
     my ($var,$defaults) = @_;
     my $key;
-    foreach $key (keys %$defaults) {
+    foreach $key (keys(%$defaults)) {
 	$var->{$key} = $defaults->{$key}->{'default'};
     }
 }
@@ -669,9 +1139,14 @@ sub set_defaults {
 ##------------------------------------------------------------------- misc
 sub get_attributes{
     my ($values,$defaults,$parstack,$safeeval,$tag) = @_;
-    foreach my $attr (keys %{$defaults}) {
-	$values->{$attr} = 
-	    &Apache::lonxml::get_param($attr,$parstack,$safeeval);
+    foreach my $attr (keys(%{$defaults})) {
+	if ($attr eq 'texwidth' || $attr eq 'texfont') {
+	    $values->{$attr} = 
+		&Apache::lonxml::get_param($attr,$parstack,$safeeval,undef,1);
+	} else {
+	    $values->{$attr} = 
+		&Apache::lonxml::get_param($attr,$parstack,$safeeval);
+	}
 	if ($values->{$attr} eq '' | !defined($values->{$attr})) {
 	    $values->{$attr} = $defaults->{$attr}->{'default'};
 	    next;
@@ -686,36 +1161,165 @@ sub get_attributes{
     }
     return ;
 }
+
 ##------------------------------------------------------- write_gnuplot_file
 sub write_gnuplot_file {
+    my ($tmpdir,$filename,$target)= @_;
+    my ($fontsize, $font_properties) =  &get_font($target);
     my $gnuplot_input = '';
     my $curve;
+    #
+    # Check to be sure we do not have any empty curves
+    my @curvescopy;
+    foreach my $curve (@curves) {
+        if (exists($curve->{'function'})) {
+            if ($curve->{'function'} !~ /^\s*$/) {
+                push(@curvescopy,$curve);
+            }
+        } elsif (exists($curve->{'data'})) {
+            foreach my $data (@{$curve->{'data'}}) {
+                if (scalar(@$data) > 0) {
+                    push(@curvescopy,$curve);
+                    last;
+                }
+            }
+        }
+    }
+    @curves = @curvescopy;
     # Collect all the colors
     my @Colors;
-    push @Colors, $plot{'bgcolor'};
-    push @Colors, $plot{'fgcolor'}; 
-    push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});
+    push @Colors, $Apache::lonplot::plot{'bgcolor'};
+    push @Colors, $Apache::lonplot::plot{'fgcolor'}; 
+    push @Colors, (defined($axis{'color'})?$axis{'color'}:$Apache::lonplot::plot{'fgcolor'});
     foreach $curve (@curves) {
 	push @Colors, ($curve->{'color'} ne '' ? 
 		       $curve->{'color'}       : 
-		       $plot{'fgcolor'}        );
+		       $Apache::lonplot::plot{'fgcolor'}        );
     }
     # set term
-    $gnuplot_input .= 'set term gif ';
-    $gnuplot_input .= 'transparent ' if ($plot{'transparent'} eq 'on');
-    $gnuplot_input .= $plot{'font'} . ' ';
-    $gnuplot_input .= 'size '.$plot{'width'}.','.$plot{'height'}.' ';
-    $gnuplot_input .= "@Colors\n";
+    if ($target eq 'web') {
+	$gnuplot_input .= 'set terminal png enhanced nocrop ';
+	$gnuplot_input .= 'transparent ' if ($Apache::lonplot::plot{'transparent'} eq 'on');
+	$gnuplot_input .= 'font "'.$Apache::lonnet::perlvar{'lonFontsDir'}.
+	    '/'.$font_properties->{'file'}.'.ttf" ';
+	$gnuplot_input .= $fontsize;
+	$gnuplot_input .= ' size '.$Apache::lonplot::plot{'width'}.','.$Apache::lonplot::plot{'height'}.' ';
+	$gnuplot_input .= "@Colors\n";
+	# set output
+	$gnuplot_input .= "set output\n";
+    } elsif ($target eq 'tex') {
+	$gnuplot_input .= "set term postscript eps enhanced $Apache::lonplot::plot{'plotcolor'} solid ";
+	if (!$font_properties->{'tex_no_file'}) {
+	    $gnuplot_input .=
+		'fontfile "'.$Apache::lonnet::perlvar{'lonFontsDir'}.
+		'/'.$font_properties->{'file'}.'.pfb" ';
+	}
+	$gnuplot_input .= ' "'.$font_properties->{'printname'}.'" ';
+	$gnuplot_input .= $fontsize;
+	$gnuplot_input .= "\nset output \"/home/httpd/perl/tmp/".
+	    &unescape($filename).".eps\"\n";
+    }
+    # cartesian or polar plot?
+    if (lc($Apache::lonplot::plot{'plottype'}) eq 'polar') {
+        $gnuplot_input .= 'set polar'.$/;
+    } else {
+        # Assume Cartesian
+    }
+    # cartesian or polar grid?
+    if (lc($Apache::lonplot::plot{'gridtype'}) eq 'polar') {
+        $gnuplot_input .= 'set grid polar'.$/;
+    } elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'linear-log') {
+        $gnuplot_input .= 'set logscale x'.$/;
+    } elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'log-linear') {
+        $gnuplot_input .= 'set logscale y'.$/;
+    } elsif (lc($Apache::lonplot::plot{'gridtype'}) eq 'log-log') {
+        $gnuplot_input .= 'set logscale x'.$/;
+        $gnuplot_input .= 'set logscale y'.$/;
+    } else {
+        # Assume Cartesian
+    }
+    # solid or pattern for boxes?
+    if (lc($Apache::lonplot::plot{'fillstyle'}) eq 'solid') {
+        $gnuplot_input .= 'set style fill solid '.
+	    $Apache::lonplot::plot{'solid'}.$Apache::lonplot::plot{'box_border'}.$/;
+    } elsif (lc($Apache::lonplot::plot{'fillstyle'}) eq 'pattern') {
+        $gnuplot_input .= 'set style fill pattern '.$Apache::lonplot::plot{'pattern'}.$Apache::lonplot::plot{'box_border'}.$/;
+    } elsif (lc($Apache::lonplot::plot{'fillstyle'}) eq 'empty') {
+    }
+    # margin
+    if (lc($Apache::lonplot::plot{'lmargin'}) ne 'default') {
+        $gnuplot_input .= 'set lmargin '.$Apache::lonplot::plot{'lmargin'}.$/;
+    }
+    if (lc($Apache::lonplot::plot{'rmargin'}) ne 'default') {
+        $gnuplot_input .= 'set rmargin '.$Apache::lonplot::plot{'rmargin'}.$/;
+    }
+    if (lc($Apache::lonplot::plot{'tmargin'}) ne 'default') {
+        $gnuplot_input .= 'set tmargin '.$Apache::lonplot::plot{'tmargin'}.$/;
+    }
+    if (lc($Apache::lonplot::plot{'bmargin'}) ne 'default') {
+        $gnuplot_input .= 'set bmargin '.$Apache::lonplot::plot{'bmargin'}.$/;
+    }
+
+    # tic scales
+    if ($version > 4) {
+	$gnuplot_input .= 'set tics scale '.
+	    $Apache::lonplot::plot{'major_ticscale'}.', '.$Apache::lonplot::plot{'minor_ticscale'}.$/;
+    } else {
+    	$gnuplot_input .= 'set ticscale '.
+	    $Apache::lonplot::plot{'major_ticscale'}.' '.$Apache::lonplot::plot{'minor_ticscale'}.$/;
+    }
+    #boxwidth
+    if (lc($Apache::lonplot::plot{'boxwidth'}) ne '') {
+	$gnuplot_input .= 'set boxwidth '.$Apache::lonplot::plot{'boxwidth'}.$/;
+    }
+    # gridlayer
+    $gnuplot_input .= 'set grid noxtics noytics front '.$/ 
+	if ($Apache::lonplot::plot{'gridlayer'} eq 'on');
+
     # grid
-    $gnuplot_input .= 'set grid'.$/ if ($plot{'grid'} eq 'on');
+    $gnuplot_input .= 'set grid'.$/ if ($Apache::lonplot::plot{'grid'} eq 'on');
     # border
-    $gnuplot_input .= ($plot{'border'} eq 'on'?
+    $gnuplot_input .= ($Apache::lonplot::plot{'border'} eq 'on'?
 		       'set border'.$/           :
-		       'set noborder'.$/         );    # title, xlabel, ylabel
-    $gnuplot_input .= "set output\n";
-    $gnuplot_input .= "set title  \"$title\"\n"  if (defined($title)) ;
-    $gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
-    $gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
+		       'set noborder'.$/         );
+    # sampling rate for non-data curves
+    $gnuplot_input .= "set samples $Apache::lonplot::plot{'samples'}\n";
+    # title, xlabel, ylabel
+    # titles
+    my $extra_space_x = ($xtics{'location'} eq 'axis') ? ' 0, -0.5 ' : '';
+    my $extra_space_y = ($ytics{'location'} eq 'axis') ? ' -0.5, 0 ' : '';
+
+    if ($target eq 'tex') {
+	$gnuplot_input .= "set title  \"$title\"          font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($title)) ;
+	$gnuplot_input .= "set xlabel \"$xlabel\" $extra_space_x font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($xlabel));
+	$gnuplot_input .= "set ylabel \"$ylabel\" $extra_space_y font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($ylabel));
+    } else {
+        $gnuplot_input .= "set title  \"$title\"          \n" if (defined($title)) ;
+        $gnuplot_input .= "set xlabel \"$xlabel\" $extra_space_x \n" if (defined($xlabel));
+        $gnuplot_input .= "set ylabel \"$ylabel\" $extra_space_y \n" if (defined($ylabel));
+    }
+    # tics
+    if (%xtics) {    
+	$gnuplot_input .= "set xtics $xtics{'location'} ";
+	$gnuplot_input .= ( $xtics{'mirror'} eq 'on'?"mirror ":"nomirror ");
+	$gnuplot_input .= "$xtics{'start'}, ";
+	$gnuplot_input .= "$xtics{'increment'}, ";
+	$gnuplot_input .= "$xtics{'end'}\n";
+        if ($xtics{'minorfreq'} != 0) {
+            $gnuplot_input .= "set mxtics ".$xtics{'minorfreq'}."\n";
+        } 
+    }
+    if (%ytics) {    
+	$gnuplot_input .= "set ytics $ytics{'location'} ";
+	$gnuplot_input .= ( $ytics{'mirror'} eq 'on'?"mirror ":"nomirror ");
+	$gnuplot_input .= "$ytics{'start'}, ";
+	$gnuplot_input .= "$ytics{'increment'}, ";
+        $gnuplot_input .= "$ytics{'end'}\n";
+        if ($ytics{'minorfreq'} != 0) {
+            $gnuplot_input .= "set mytics ".$ytics{'minorfreq'}."\n";
+        } 
+    }
+    # axis
     if (%axis) {
 	$gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
 	$gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
@@ -734,23 +1338,50 @@ sub write_gnuplot_file {
     my $label;
     foreach $label (@labels) {
 	$gnuplot_input .= 'set label "'.$label->{'text'}.'" at '.
-	    $label->{'xpos'}.','.$label->{'ypos'}.' '.$label->{'justify'}.$/ ;
+	    $label->{'xpos'}.','.$label->{'ypos'}.' '.$label->{'justify'};
+        if ($target eq 'tex') {
+	    $gnuplot_input .=' font "'.$font_properties->{'printname'}.','.$fontsize.'pt"' ;
+        }
+        $gnuplot_input .= $/;
+    }
+    if ($target eq 'tex') {
+        $gnuplot_input .="set size 1,".$Apache::lonplot::plot{'height'}/$Apache::lonplot::plot{'width'}*1.38;
+        $gnuplot_input .="\n";
     }
     # curves
     $gnuplot_input .= 'plot ';
-    my $datatext = '';
     for (my $i = 0;$i<=$#curves;$i++) {
 	$curve = $curves[$i];
 	$gnuplot_input.= ', ' if ($i > 0);
+	if ($target eq 'tex') {
+	    $curve->{'linewidth'} *= 2;
+	}
 	if (exists($curve->{'function'})) {
 	    $gnuplot_input.= 
 		$curve->{'function'}.' title "'.
 		$curve->{'name'}.'" with '.
-		$curve->{'linestyle'};
+                $curve->{'linestyle'};
+
+            if (($curve->{'linestyle'} eq 'points')      ||
+                ($curve->{'linestyle'} eq 'linespoints') ||
+                ($curve->{'linestyle'} eq 'errorbars')   ||
+                ($curve->{'linestyle'} eq 'xerrorbars')  ||
+                ($curve->{'linestyle'} eq 'yerrorbars')  ||
+                ($curve->{'linestyle'} eq 'xyerrorbars')) {
+                $gnuplot_input.=' pointtype '.$curve->{'pointtype'};
+                $gnuplot_input.=' pointsize '.$curve->{'pointsize'};
+            } elsif ($curve->{'linestyle'} eq 'filledcurves') { 
+                $gnuplot_input.= ' '.$curve->{'limit'};
+            }
+            $gnuplot_input.= ' linewidth '.$curve->{'linewidth'};
+
 	} elsif (exists($curve->{'data'})) {
-	    $gnuplot_input.= '\'-\' title "'.
-		$curve->{'name'}.'" with '.
-		$curve->{'linestyle'};
+	    # Store data values in $datatext
+	    my $datatext = '';
+	    #   get new filename
+	    my $datafilename = "$tmpdir/$filename.data.$i";
+	    my $fh=Apache::File->new(">$datafilename");
+	    # Compile data
 	    my @Data = @{$curve->{'data'}};
 	    my @Data0 = @{$Data[0]};
 	    for (my $i =0; $i<=$#Data0; $i++) {
@@ -760,20 +1391,43 @@ sub write_gnuplot_file {
 		}
 		$datatext .= $/;
 	    }
-	    $datatext .=$/;
+	    #   write file
+	    print $fh $datatext;
+	    close($fh);
+	    #   generate gnuplot text
+	    $gnuplot_input.= '"'.$datafilename.'" title "'.
+		$curve->{'name'}.'" with '.
+		$curve->{'linestyle'};
+            if (($curve->{'linestyle'} eq 'points')      ||
+                ($curve->{'linestyle'} eq 'linespoints') ||
+                ($curve->{'linestyle'} eq 'errorbars')   ||
+                ($curve->{'linestyle'} eq 'xerrorbars')  ||
+                ($curve->{'linestyle'} eq 'yerrorbars')  ||
+                ($curve->{'linestyle'} eq 'xyerrorbars')) {
+                $gnuplot_input.=' pointtype '.$curve->{'pointtype'};
+                $gnuplot_input.=' pointsize '.$curve->{'pointsize'};
+            } elsif ($curve->{'linestyle'} eq 'filledcurves') { 
+                $gnuplot_input.= ' '.$curve->{'limit'};
+            }
+            $gnuplot_input.= ' linewidth '.$curve->{'linewidth'};
 	}
     }
-    $gnuplot_input .= $/.$datatext;
-    return $gnuplot_input;
+    # Write the output to a file.
+    open (my $fh,">$tmpdir$filename.data");
+    binmode($fh, ":utf8");
+    print $fh $gnuplot_input;
+    close($fh);
+    # That's all folks.
+    return ;
 }
 
 #---------------------------------------------- check_inputs
 sub check_inputs {
     ## Note: no inputs, no outputs - this acts only on global variables.
     ## Make sure we have all the input we need:
-    if (! %plot) { &set_defaults(\%plot,\%plot_defaults); }
+    if (! %Apache::lonplot::plot) { &set_defaults(\%Apache::lonplot::plot,\%gnuplot_defaults); }
     if (! %key ) {} # No key for this plot, thats okay
-    if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
+#    if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
     if (! defined($title )) {} # No title for this plot, thats okay
     if (! defined($xlabel)) {} # No xlabel for this plot, thats okay
     if (! defined($ylabel)) {} # No ylabel for this plot, thats okay
@@ -785,7 +1439,7 @@ sub check_inputs {
     my $curve;
     foreach $curve (@curves) {
 	if (!defined($curve->{'function'})&&!defined($curve->{'data'})){
-	    &Apache::lonxml::warning("One of the curves specified did not contain any <data> or <function> declarations\n");
+	    &Apache::lonxml::warning("One of the curves specified did not contain any curve data or curve function declarations\n");
 	    return '';
 	}
     }
@@ -793,21 +1447,29 @@ sub check_inputs {
 
 #------------------------------------------------ make_edit
 sub edit_attributes {
-    my ($target,$token,$defaults) = @_;
-    my $result;
-    foreach my $attr (%$defaults) {
+    my ($target,$token,$defaults,$keys) = @_;
+    my ($result,@keys);
+    if ($keys && ref($keys) eq 'ARRAY') {
+        @keys = @$keys;
+    } else {
+	@keys = sort(keys(%$defaults));
+    }
+    foreach my $attr (@keys) {
+	# append a ' ' to the description if it doesn't have one already.
+	my $description = $defaults->{$attr}->{'description'};
+	$description .= ' ' if ($description !~ / $/);
 	if ($defaults->{$attr}->{'edit_type'} eq 'entry') {
-	    $result .= &Apache::edit::text_arg(
-                 $defaults->{$attr}->{'description'},
-		 $attr,
-		 $token);
+	    $result .= &Apache::edit::text_arg
+		($description,$attr,$token,
+		 $defaults->{$attr}->{'size'});
 	} elsif ($defaults->{$attr}->{'edit_type'} eq 'choice') {
-	    $result .= &Apache::edit::select_arg(
-		 $defaults->{$attr}->{'description'},
-		 $attr,
-		 $defaults->{$attr}->{'choices'},
-		 $token);
+	    $result .= &Apache::edit::select_or_text_arg
+		($description,$attr,$defaults->{$attr}->{'choices'},$token);
+	} elsif ($defaults->{$attr}->{'edit_type'} eq 'onoff') {
+	    $result .= &Apache::edit::select_or_text_arg
+		($description,$attr,['on','off'],$token);
 	}
+	$result .= '<br />';
     }
     return $result;
 }
@@ -819,84 +1481,107 @@ sub edit_attributes {
 ##                                                               ##
 ###################################################################
 
-#------------------------------------------------ insert_xxxxxxx
-sub insert_plot {
-    my $result;
+sub insert_gnuplot {
+    my $result = '';
     #  plot attributes
-    $result .= '<plot ';
-    foreach my $attr (%plot_defaults) {
-	$result .= '     '.$attr.' "'.$plot_defaults{$attr}->{'default'}.
-	    "\"\n";
-    }
-    $result .= ">\n";
-    # Add the components
-    $result .= &insert_key();
-    $result .= &insert_axis();
-    $result .= &insert_label();    
+    $result .= "\n<gnuplot ";
+    foreach my $attr (keys(%gnuplot_defaults)) {
+	$result .= "\n     $attr=\"$gnuplot_defaults{$attr}->{'default'}\"";
+    }
+    $result .= ">";
+    # Add the components (most are commented out for simplicity)
+    # $result .= &insert_key();
+    # $result .= &insert_axis();
+    # $result .= &insert_title();    
+    # $result .= &insert_xlabel();    
+    # $result .= &insert_ylabel();    
     $result .= &insert_curve();
-    $result .= &insert_function();    
-    $result .= "</curve>\n";
-    $result .= &insert_curve();
-    $result .= &insert_data();    
-    $result .= "</curve>\n";
-    # close up the <plot>
-    $result .= "</plot>\n";
+    # close up the <gnuplot>
+    $result .= "\n</gnuplot>";
+    return $result;
+}
+
+sub insert_tics {
+    my $result;
+    $result .= &insert_xtics() . &insert_ytics;
+    return $result;
+}
+
+sub insert_xtics {
+    my $result;
+    $result .= "\n    <xtics ";
+    foreach my $attr (keys(%tic_defaults)) {
+	$result .= "\n        $attr=\"$tic_defaults{$attr}->{'default'}\" ";
+    }
+    $result .= "/>";
+    return $result;
+}
+
+sub insert_ytics {
+    my $result;
+    $result .= "\n    <ytics ";
+    foreach my $attr (keys(%tic_defaults)) {
+	$result .= "\n        $attr=\"$tic_defaults{$attr}->{'default'}\" ";
+    }
+    $result .= "/>";
     return $result;
 }
 
 sub insert_key {
     my $result;
-    $result .= '    <key ';
-    foreach my $attr (%key_defaults) {
-	$result .= '         '.$attr.' "'.$key_defaults{$attr}->{'default'}.
-	    "\"\n";
+    $result .= "\n    <key ";
+    foreach my $attr (keys(%key_defaults)) {
+	$result .= "\n         $attr=\"$key_defaults{$attr}->{'default'}\"";
     }
-    $result .= "   />\n";
+    $result .= " />";
     return $result;
 }
 
 sub insert_axis{
     my $result;
-    $result .= '    <axis ';
-    foreach my $attr (%axis_defaults) {
-	$result .= '         '.$attr.' "'.$axis_defaults{$attr}->{'default'}.
-	    "\"\n";
+    $result .= "\n    <axis ";
+   foreach my $attr (keys(%axis_defaults)) {
+	$result .= "\n         $attr=\"$axis_defaults{$attr}->{'default'}\"";
     }
-    $result .= "   />\n";
+    $result .= " />";
     return $result;
 }
 
+sub insert_title  { return "\n    <title></title>"; }
+sub insert_xlabel { return "\n    <xlabel></xlabel>"; }
+sub insert_ylabel { return "\n    <ylabel></ylabel>"; }
+
 sub insert_label {
     my $result;
-    $result .= '    <label ';
-    foreach my $attr (%label_defaults) {
-	$result .= '         '.$attr.' "'.
-	    $label_defaults{$attr}->{'default'}."\"\n";
+    $result .= "\n    <label ";
+    foreach my $attr (keys(%label_defaults)) {
+	$result .= "\n         $attr=\"".
+            $label_defaults{$attr}->{'default'}."\"";
     }
-    $result .= "   ></label>\n";
+    $result .= "></label>";
     return $result;
 }
 
 sub insert_curve {
     my $result;
-    $result .= '    <curve ';
-    foreach my $attr (%curve_defaults) {
-	$result .= '         '.$attr.' "'.
-	    $curve_defaults{$attr}->{'default'}."\"\n";
+    $result .= "\n    <curve ";
+    foreach my $attr (keys(%curve_defaults)) {
+	$result .= "\n         $attr=\"".
+	    $curve_defaults{$attr}->{'default'}."\"";
     }
-    $result .= "    >\n";
+    $result .= " >";
+    $result .= &insert_data().&insert_data()."\n    </curve>";
 }
 
 sub insert_function {
     my $result;
-    $result .= "<function></function>\n";
+    $result .= "\n        <function></function>";
     return $result;
 }
 
 sub insert_data {
     my $result;
-    $result .= "     <data></data>\n";
-    $result .= "     <data></data>\n";
+    $result .= "\n        <data></data>";
     return $result;
 }