--- loncom/xml/lonplot.pm	2001/12/27 22:30:01	1.20
+++ loncom/xml/lonplot.pm	2002/01/02 14:33:50	1.30
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Dynamic plot
 #
-# $Id: lonplot.pm,v 1.20 2001/12/27 22:30:01 matthew Exp $
+# $Id: lonplot.pm,v 1.30 2002/01/02 14:33:50 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -26,7 +26,7 @@
 # http://www.lon-capa.org/
 #
 # 12/15/01 Matthew
-# 12/17 12/18 12/19 12/20 12/21 12/27 Matthew
+# 12/17 12/18 12/19 12/20 12/21 12/27 12/28 12/30 Matthew
 package Apache::lonplot;
 
 use strict;
@@ -63,10 +63,34 @@ sub BEGIN {
 ##  $curves[$i]->{'data'} = [ [x1,x2,x3,x4],
 ##                            [y1,y2,y3,y4] ]
 ##
-##------------------------------------------------------------
-##
-## Tests used in checking the validitity of input
-##
+
+###################################################################
+##                                                               ##
+##        Tests used in checking the validitity of input         ##
+##                                                               ##
+###################################################################
+
+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	    => 2,
+     xerrorbars	    => 2,
+     yerrorbars	    => 2,
+     xyerrorbars    => 2,
+     boxes          => 2,
+     boxerrorbars   => 2,
+     boxxyerrorbars => 2,
+     financebars    => 2,
+     candlesticks   => 2,
+     vector	    => 2
+    );		    
+
 my $int_test       = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};
 my $real_test      = 
     sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d*\.?\d*([eE][+-]\d+)?$/};
@@ -74,23 +98,26 @@ my $color_test     = sub {$_[0]=~s/\s+//
 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 $linestyle_test = sub {exists($linestyles{$_[0]})};
 my $words_test     = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w\(\)]+ ?)+$/};
-##
-## Attribute metadata
-##
+
+###################################################################
+##                                                               ##
+##                      Attribute metadata                       ##
+##                                                               ##
+###################################################################
 my %plot_defaults = 
     (
      height       => {
 	 default     => 200,
 	 test        => $int_test,
-	 description => 'vertical size of image (pixels)',
+	 description => 'height of image (pixels)',
 	 edit_type   => 'entry' 
 	 },
      width        => {
 	 default     => 200,
 	 test        => $int_test,
-	 description => 'horizontal size of image (pixels)',
+	 description => 'width of image (pixels)',
 	 edit_type   => 'entry'
 	 },
      bgcolor      => {
@@ -188,7 +215,7 @@ my %label_defaults =
 
 my %axis_defaults = 
     (
-     color     => {
+     color   => {
 	 default => 'x000000', 
 	 test => $color_test,
 	 description => 'color of axes (x000000)',
@@ -217,13 +244,6 @@ my %axis_defaults =
 	 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']
 	 }
      );
 
@@ -246,77 +266,65 @@ my %curve_defaults =
 	 test => $linestyle_test,
 	 description => 'Style of the axis lines',
 	 edit_type   => 'choice',
-	 choices     => ['lines','linespoints','dots','points','steps']
+	 choices     => ['lines','linespoints','dots','points','steps',
+			 'fsteps','histeps','errorbars','xerrorbars',
+			 'yerrorbars','xyerrorbars','boxes','boxerrorbars',
+			 'boxxyerrorbars','financebars','candlesticks',
+			 'vector']
 	 }
      );
 
-##
-## End of defaults
-##
+###################################################################
+##                                                               ##
+##                    parsing and edit rendering                 ##
+##                                                               ##
+###################################################################
 my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves);
 
 sub start_plot {
-    %plot    = undef;   %key     = undef;   %axis   = undef; 
+    %plot    = ();      %key     = ();      %axis   = (); 
     $title   = undef;   $xlabel  = undef;   $ylabel = undef;
     $#labels = -1;      $#curves = -1;
     #
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
+    &Apache::lonxml::register('Apache::lonplot',
+	     ('title','xlabel','ylabel','key','axis','label','curve'));
+    push (@Apache::lonxml::namespace,'lonplot');
     if ($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,
 			$tagstack->[-1]);
     } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::tag_start($target,$token,'Plot');
+	$result .= &edit_attributes($target,$token,\%plot_defaults);
     } elsif ($target eq 'modified') {
 	my $constructtag=&Apache::edit::get_new_args
-	    ($token,$parstack,$safeeval,keys %plot_defaults);
+	    ($token,$parstack,$safeeval,keys(%plot_defaults));
 	if ($constructtag) {
 	    $result = &Apache::edit::rebuild_tag($token);
-	    $result.= &Apache::edit::handle_insert();
+#	    $result.= &Apache::edit::handle_insert();
 	}
     }
-    return '';
+    return $result;
 }
 
 sub end_plot {
     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') {
-	##
-	## Make sure we have all the input we need:
-	if (! defined(%plot  )) { &set_defaults(\%plot,\%plot_defaults); }
-	if (! defined(%key   )) {} # No key for this plot
-	if (! defined(%axis  )) { &set_defaults(\%axis,\%axis_defaults); }
-	if (! defined($title )) {} # No title for this plot
-	if (! defined($xlabel)) {} # No xlabel for this plot
-	if (! defined($ylabel)) {} # No ylabel for this plot
-	if ($#labels < 0) { } # No labels for this plot
-	if ($#curves < 0) { 
-	    &Apache::lonxml::warning("No curves specified for plot!!!!");
-	    return '';
-	}
-	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");
-		return '';
-	    }
-	}
+	&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.'_'.$$.'_plot.data';
+	    '_'.time.'_'.$$.int(rand(1000)).'_plot.data';
 	## Write the plot description to the file
 	my $fh=Apache::File->new(">$tmpdir$filename");
 	print $fh &write_gnuplot_file();
@@ -330,7 +338,7 @@ sub end_plot {
      alt    = "/cgi-bin/plot.gif?$filename" />
 ENDIMAGE
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
@@ -343,9 +351,11 @@ sub start_key {
 	&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
 		    $tagstack->[-1]);
     } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::tag_start($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();
@@ -359,10 +369,11 @@ sub end_key {
     my $result = '';
     if ($target eq 'web') {
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
+
 ##------------------------------------------------------------------- title
 sub start_title {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
@@ -370,7 +381,13 @@ sub start_title {
     if ($target eq 'web') {
 	$title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
     } elsif ($target eq 'edit') {
+	$result.=&Apache::edit::tag_start($target,$token,'Plot Title');
+	my $text=&Apache::lonxml::get_all_text("/title",$$parser[-1]);
+	$result.='</td></tr><tr><td colspan="3">'.
+	    &Apache::edit::editfield('',$text,'',60,1);
     } elsif ($target eq 'modified') {
+	my $text=$$parser[-1]->get_text("/title");
+	$result.=&Apache::edit::modifiedfield($token);
     }
     return $result;
 }
@@ -380,7 +397,7 @@ sub end_title {
     my $result = '';
     if ($target eq 'web') {
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
@@ -391,7 +408,13 @@ sub start_xlabel {
     if ($target eq 'web') {
 	$xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
     } elsif ($target eq 'edit') {
+	$result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
+	my $text=&Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
+	$result.='</td></tr><tr><td colspan="3">'.
+	    &Apache::edit::editfield('',$text,'',60,1);
     } elsif ($target eq 'modified') {
+	my $text=$$parser[-1]->get_text("/xlabel");
+	$result.=&Apache::edit::modifiedfield($token);
     }
     return $result;
 }
@@ -401,10 +424,11 @@ sub end_xlabel {
     my $result = '';
     if ($target eq 'web') {
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
+
 ##------------------------------------------------------------------- ylabel
 sub start_ylabel {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
@@ -412,7 +436,13 @@ sub start_ylabel {
     if ($target eq 'web') {
 	$ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
     } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::tag_start($target,$token,'Plot Ylabel');
+	my $text = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
+	$result .= '</td></tr><tr><td colspan="3">'.
+	    &Apache::edit::editfield('',$text,'',60,1);
     } elsif ($target eq 'modified') {
+	my $text=$$parser[-1]->get_text("/ylabel");
+	$result.=&Apache::edit::modifiedfield($token);
     }
     return $result;
 }
@@ -422,10 +452,11 @@ sub end_ylabel {
     my $result = '';
     if ($target eq 'web') {
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
+
 ##------------------------------------------------------------------- label
 sub start_label {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
@@ -441,13 +472,20 @@ sub start_label {
 	}
 	push(@labels,\%label);
     } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::tag_start($target,$token,'Plot Label');
+	$result .= &edit_attributes($target,$token,\%label_defaults);
+	my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
+	$result .= '</td></tr><tr><td colspan="3">'.
+	    &Apache::edit::editfield('',$text,'',60,1);
     } elsif ($target eq 'modified') {
 	my $constructtag=&Apache::edit::get_new_args
-	    ($token,$parstack,$safeeval,keys %label_defaults);
+	    ($token,$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);
     }
     return $result;
 }
@@ -457,7 +495,7 @@ sub end_label {
     my $result = '';
     if ($target eq 'web') {
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
@@ -466,17 +504,19 @@ sub end_label {
 sub start_curve {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';
+    &Apache::lonxml::register('Apache::lonplot',('function','data'));
+    push (@Apache::lonxml::namespace,'curve');
     if ($target eq 'web') {
 	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,'Curve');
+	$result .= &edit_attributes($target,$token,\%curve_defaults);
     } elsif ($target eq 'modified') {
 	my $constructtag=&Apache::edit::get_new_args
-	    ($token,$parstack,$safeeval,keys %label_defaults);
+	    ($token,$parstack,$safeeval,keys(%label_defaults));
 	if ($constructtag) {
 	    $result = &Apache::edit::rebuild_tag($token);
 	    $result.= &Apache::edit::handle_insert();
@@ -488,14 +528,15 @@ sub start_curve {
 sub end_curve {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';
+    pop @Apache::lonxml::namespace;
+    &Apache::lonxml::deregister('Apache::lonplot',('function','data'));
     if ($target eq 'web') {
-	pop @Apache::lonxml::namespace;
-	&Apache::lonxml::deregister('Apache::lonplot',('function','data'));
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result.=&Apache::edit::tag_end($target,$token);
     }
     return $result;
 }
+
 ##------------------------------------------------------------ curve function
 sub start_function {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
@@ -508,11 +549,10 @@ sub start_function {
 	$curves[-1]->{'function'} = 
 	    &Apache::lonxml::get_all_text("/function",$$parser[-1]);
     } elsif ($target eq 'edit') {
-	$result.=&Apache::edit::tag_start($target,$token);
-	my $text=&Apache::lonxml::get_all_text("/function",$$parser[-1]);
-	$result.='</td></tr><tr><td colspan="3">'.
-	    &Apache::edit::editfield('',$text,'',20,1).
-	    &Apache::edit::end_table();
+	$result .= &Apache::edit::tag_start($target,$token,'Curve Function');
+	my $text = &Apache::lonxml::get_all_text("/function",$$parser[-1]);
+	$result .= '</td></tr><tr><td colspan="3">'.
+	    &Apache::edit::editfield('',$text,'',60,1);
     } elsif ($target eq 'modified') {
 	# Why do I do this?
 	my $text=$$parser[-1]->get_text("/function");
@@ -526,10 +566,11 @@ sub end_function {
     my $result = '';
     if ($target eq 'web') {
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result .= &Apache::edit::end_table();
     }
     return $result;
 }
+
 ##------------------------------------------------------------ curve  data
 sub start_data {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
@@ -570,7 +611,13 @@ sub start_data {
 	}
 	push  @{$curves[-1]->{'data'}},\@data;
     } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::tag_start($target,$token,'Curve Data');
+	my $text = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
+	$result .= '</td></tr><tr><td colspan="3">'.
+	    &Apache::edit::editfield('',$text,'',60,1);
     } elsif ($target eq 'modified') {
+	my $text=$$parser[-1]->get_text("/data");
+	$result.=&Apache::edit::modifiedfield($token);
     }
     return $result;
 }
@@ -580,7 +627,7 @@ sub end_data {
     my $result = '';
     if ($target eq 'web') {
     } elsif ($target eq 'edit') {
-    } elsif ($target eq 'modified') {
+	$result .= &Apache::edit::end_table();
     }
     return $result;
 }
@@ -593,7 +640,15 @@ sub start_axis {
 	&get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
 			$tagstack->[-1]);
     } elsif ($target eq 'edit') {
+	$result .= &Apache::edit::tag_start($target,$token,'Plot Axes');
+	$result .= &edit_attributes($target,$token,\%axis_defaults);
     } elsif ($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;
 }
@@ -603,35 +658,31 @@ sub end_axis {
     my $result = '';
     if ($target eq 'web') {
     } 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;
 }
 
+###################################################################
+##                                                               ##
+##        Utility Functions                                      ##
+##                                                               ##
+###################################################################
+
 ##----------------------------------------------------------- set_defaults
 sub set_defaults {
-    my $var      = shift;
-    my $defaults = shift;
+    my ($var,$defaults) = @_;
     my $key;
-    foreach $key (keys %$defaults) {
+    foreach $key (keys(%$defaults)) {
 	$var->{$key} = $defaults->{$key}->{'default'};
     }
 }
 
 ##------------------------------------------------------------------- misc
 sub get_attributes{
-    my $values   = shift;
-    my $defaults = shift;
-    my $parstack = shift;
-    my $safeeval = shift;
-    my $tag      = shift;
-    foreach my $attr (keys %{$defaults}) {
+    my ($values,$defaults,$parstack,$safeeval,$tag) = @_;
+    foreach my $attr (keys(%{$defaults})) {
 	$values->{$attr} = 
 	    &Apache::lonxml::get_param($attr,$parstack,$safeeval);
 	if ($values->{$attr} eq '' | !defined($values->{$attr})) {
@@ -678,12 +729,12 @@ sub write_gnuplot_file {
     $gnuplot_input .= "set title  \"$title\"\n"  if (defined($title)) ;
     $gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
     $gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
-    if (defined(%axis)) {
+    if (%axis) {
 	$gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
 	$gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
     }
     # Key
-    if (defined(%key)) {
+    if (%key) {
 	$gnuplot_input .= 'set key '.$key{'pos'}.' ';
 	if ($key{'title'} ne '') {
 	    $gnuplot_input .= 'title "'.$key{'title'}.'" ';
@@ -728,13 +779,36 @@ sub write_gnuplot_file {
     $gnuplot_input .= $/.$datatext;
     return $gnuplot_input;
 }
+
+#---------------------------------------------- check_inputs
+sub check_inputs {
+    ## Note: no inputs, no outputs - this acts only on global variables.
+    ## Make sure we have all the input we need:
+    if (! %plot) { &set_defaults(\%plot,\%plot_defaults); }
+    if (! %key ) {} # No key for this plot, thats okay
+    if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
+    if (! defined($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
+    if ($#labels < 0) { }      # No labels for this plot, thats okay
+    if ($#curves < 0) { 
+	&Apache::lonxml::warning("No curves specified for plot!!!!");
+	return '';
+    }
+    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");
+	    return '';
+	}
+    }
+}
+
 #------------------------------------------------ make_edit
 sub edit_attributes {
-    my $target    = shift;
-    my $token     = shift;
-    my $defaults  = shift;
+    my ($target,$token,$defaults) = @_;
     my $result;
-    foreach my $attr (%{$token->[2]}) {
+    foreach my $attr (sort keys(%$defaults)) {
 	if ($defaults->{$attr}->{'edit_type'} eq 'entry') {
 	    $result .= &Apache::edit::text_arg(
                  $defaults->{$attr}->{'description'},
@@ -747,30 +821,34 @@ sub edit_attributes {
 		 $defaults->{$attr}->{'choices'},
 		 $token);
 	}
+	$result .= '<br />';
     }
     return $result;
 }
 
+
+###################################################################
+##                                                               ##
+##           Insertion functions for editing plots               ##
+##                                                               ##
+###################################################################
+
 #------------------------------------------------ insert_xxxxxxx
 sub insert_plot {
-    my $result;
+    my $result = '';
     #  plot attributes
-    $result .= '<plot ';
-    foreach my $attr (%plot_defaults) {
-	$result .= '     '.$attr.' "'.$plot_defaults{$attr}->{'default'}.
-	    "\"\n";
+    $result .= "<plot \n";
+    foreach my $attr (keys(%plot_defaults)) {
+	$result .= "     $attr=\"$plot_defaults{$attr}->{'default'}\"\n";
     }
     $result .= ">\n";
     # Add the components
     $result .= &insert_key();
     $result .= &insert_axis();
-    $result .= &insert_label();    
-    $result .= &insert_curve();
-    $result .= &insert_function();    
-    $result .= "</curve>\n";
+    $result .= &insert_title();    
+    $result .= &insert_xlabel();    
+    $result .= &insert_ylabel();    
     $result .= &insert_curve();
-    $result .= &insert_data();    
-    $result .= "</curve>\n";
     # close up the <plot>
     $result .= "</plot>\n";
     return $result;
@@ -778,10 +856,9 @@ sub insert_plot {
 
 sub insert_key {
     my $result;
-    $result .= '    <key ';
-    foreach my $attr (%key_defaults) {
-	$result .= '         '.$attr.' "'.$key_defaults{$attr}->{'default'}.
-	    "\"\n";
+    $result .= "    <key \n";
+    foreach my $attr (keys(%key_defaults)) {
+	$result .= "         $attr=\"$key_defaults{$attr}->{'default'}\"\n";
     }
     $result .= "   />\n";
     return $result;
@@ -790,19 +867,22 @@ sub insert_key {
 sub insert_axis{
     my $result;
     $result .= '    <axis ';
-    foreach my $attr (%axis_defaults) {
-	$result .= '         '.$attr.' "'.$axis_defaults{$attr}->{'default'}.
-	    "\"\n";
+   foreach my $attr (keys(%axis_defaults)) {
+	$result .= "         $attr=\"$axis_defaults{$attr}->{'default'}\"\n";
     }
     $result .= "   />\n";
     return $result;
 }
 
+sub insert_title { return "    <title></title>\n"; }
+sub insert_xlabel { return "    <xlabel></xlabel>\n"; }
+sub insert_ylabel { return "    <ylabel></ylabel>\n"; }
+
 sub insert_label {
     my $result;
     $result .= '    <label ';
-    foreach my $attr (%label_defaults) {
-	$result .= '         '.$attr.' "'.
+    foreach my $attr (keys(%label_defaults)) {
+	$result .= '         '.$attr.'="'.
 	    $label_defaults{$attr}->{'default'}."\"\n";
     }
     $result .= "   ></label>\n";
@@ -812,11 +892,11 @@ sub insert_label {
 sub insert_curve {
     my $result;
     $result .= '    <curve ';
-    foreach my $attr (%curve_defaults) {
-	$result .= '         '.$attr.' "'.
+    foreach my $attr (keys(%curve_defaults)) {
+	$result .= '         '.$attr.'="'.
 	    $curve_defaults{$attr}->{'default'}."\"\n";
     }
-    $result .= "    >\n";
+    $result .= "    ></curve>\n";
 }
 
 sub insert_function {
@@ -828,10 +908,10 @@ sub insert_function {
 sub insert_data {
     my $result;
     $result .= "     <data></data>\n";
-    $result .= "     <data></data>\n";
     return $result;
 }
 
+##----------------------------------------------------------------------
 1;
 __END__