--- loncom/xml/lonplot.pm	2007/08/03 06:08:06	1.124
+++ loncom/xml/lonplot.pm	2007/09/18 23:29:39	1.130
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Dynamic plot
 #
-# $Id: lonplot.pm,v 1.124 2007/08/03 06:08:06 albertel Exp $
+# $Id: lonplot.pm,v 1.130 2007/09/18 23:29:39 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -36,11 +36,10 @@ use Apache::response;
 use Apache::lonxml;
 use Apache::edit;
 use Apache::lonnet;
-use lib '/home/httpd/lib/perl/';
 use LONCAPA;
  
 
-use vars qw/$weboutputformat $versionstring/;
+use vars qw/$weboutputformat $version/;
 
 
 
@@ -49,8 +48,9 @@ BEGIN {
     #
     # Determine the version of GNUPLOT
     $weboutputformat = 'gif';
-    $versionstring = `gnuplot --version 2>/dev/null`;
-    if ($versionstring =~ /^gnuplot 4/) {
+    my $versionstring = `gnuplot --version 2>/dev/null`;
+    ($version) = ($versionstring =~ /^gnuplot ([\d.]+)/);
+    if ($version >= 4) {
         $weboutputformat = 'png';
     }
     
@@ -206,9 +206,9 @@ my %gnuplot_defaults =
      font         => {
 	 default     => '9',
 	 test        => $sml_test,
-	 description => 'Size of font to use',
+	 description => 'Font size to use in web output (pts)',
 	 edit_type   => 'choice',
-	 choices     => [['5','5 (small)'],'7',['9','9 (medium)'],'10','12',['15','15 (large)']]
+	 choices     => [['5','5 (small)'],'6','7','8',['9','9 (medium)'],'10',['11','11 (large)'],'12','15']
 	 },
      fontface     => {
         default     => 'sans-serif',
@@ -501,7 +501,7 @@ my %curve_defaults =
 	 choices     => [keys(%linestyles)]
 	 },
      linewidth => {
-         default     => 4,
+         default     => 1,
          test        => $int_test,
          description => 'Line width (may not apply to all line styles)',
          edit_type   => 'choice',
@@ -713,7 +713,7 @@ sub get_font {
 	} elsif ( $Apache::lonplot::plot{'font'} eq 'medium') {
 	    $size = '9';
 	} elsif ( $Apache::lonplot::plot{'font'} eq 'large') {
-	    $size = '15';
+	    $size = '11';
 	} else {
 	    $size = '9';
 	}
@@ -757,6 +757,47 @@ sub end_key {
     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)=@_;
@@ -768,6 +809,7 @@ sub start_title {
 	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,'Plot Title');
 	my $text=&Apache::lonxml::get_all_text("/title",$parser,$style);
@@ -799,6 +841,7 @@ sub start_xlabel {
 	if (length($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,'Plot Xlabel');
 	my $text=&Apache::lonxml::get_all_text("/xlabel",$parser,$style);
@@ -831,6 +874,7 @@ sub start_ylabel {
 	if (length($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,'Plot Ylabel');
 	my $text = &Apache::lonxml::get_all_text("/ylabel",$parser,$style);
@@ -864,7 +908,7 @@ sub start_label {
 	$text = &Apache::run::evaluate($text,$safeeval,$$parstack[-1]);
 	$text =~ s/\n/ /g;
 	$text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
-	$label{'text'} = $text;
+	$label{'text'} = &parse_label($target,$text);
 	push(@labels,\%label);
     } elsif ($target eq 'edit') {
 	$result .= &Apache::edit::tag_start($target,$token,'Plot Label');
@@ -1215,9 +1259,15 @@ sub write_gnuplot_file {
     if (lc($Apache::lonplot::plot{'bmargin'}) ne 'default') {
         $gnuplot_input .= 'set bmargin '.$Apache::lonplot::plot{'bmargin'}.$/;
     }
+
     # tic scales
-    $gnuplot_input .= 'set ticscale '.
-        $Apache::lonplot::plot{'major_ticscale'}.' '.$Apache::lonplot::plot{'minor_ticscale'}.$/;
+    if ($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'}.$/;
@@ -1236,14 +1286,17 @@ sub write_gnuplot_file {
     $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\" font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($xlabel));
-	$gnuplot_input .= "set ylabel \"$ylabel\" font \"".$font_properties->{'printname'}.",".$fontsize."pt\"\n" if (defined($ylabel));
+	$gnuplot_input .= "set title  \"$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\" \n" if (defined($xlabel));
-        $gnuplot_input .= "set ylabel \"$ylabel\" \n" if (defined($ylabel));
+        $gnuplot_input .= "set title  \"$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) {    
@@ -1359,7 +1412,8 @@ sub write_gnuplot_file {
 	}
     }
     # Write the output to a file.
-    my $fh=Apache::File->new(">$tmpdir$filename.data");
+    open (my $fh,">$tmpdir$filename.data");
+    binmode($fh, ":utf8");
     print $fh $gnuplot_input;
     close($fh);
     # That's all folks.