--- loncom/xml/lontexconvert.pm	2008/01/29 11:18:06	1.86
+++ loncom/xml/lontexconvert.pm	2008/12/04 19:53:53	1.93
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.86 2008/01/29 11:18:06 foxr Exp $
+# $Id: lontexconvert.pm,v 1.93 2008/12/04 19:53:53 riegler Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -47,6 +47,7 @@ use Apache::lonlocal;
 use Apache::lonnet;
 use lib '/home/httpd/lib/perl/';
 use LONCAPA;
+use LWP::UserAgent;
  
 
 # ====================================================================== Header
@@ -79,10 +80,7 @@ sub init_tth {
 
 $Apache::lontexconvert::messedup=0;
 
-# we need this routine because &converted can get called from inside
-# of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
-# allow the opcode for alarm, so we need to compile this before we get
-# into the safe space since opcode checks only occur at compile time
+
 sub convert_real {
     my ($texstring)=@_;
     my ($xmlstring,$errorstring);
@@ -113,7 +111,8 @@ sub convert_real {
     # reasonably well to &#8660;.  If we get many more of these,
     # we're going to need to have a translation sub.
     #
-    $xmlstring=~s/\\rightleftharpoons/\&\#8660;/g;
+    my $lrharpoon = pack("U", 0x21cc);
+    $xmlstring=~s/\\rightleftharpoons/$lrharpoon/g;
 
     &Apache::lonxml::end_alarm();
     return ($xmlstring,$errorstring);
@@ -218,7 +217,9 @@ sub jsMath_converted {
 
 sub tex_engine {
     if (exists($env{'form.texengine'})) {
-	return $env{'form.texengine'};
+	if ($env{'form.texengine'} ne '') {
+            return $env{'form.texengine'};
+        }
     }    
     if ($env{'request.course.id'}
 	&& exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
@@ -241,6 +242,21 @@ sub init_math_support {
     return;
 }
 
+sub mimetex_valign {
+    my ($texstring)=@_;
+    my $ua = LWP::UserAgent->new; #from the perldoc of LWP::UserAgent
+    $ua->timeout(10); 
+    $ua->env_proxy;
+    #header without imagedata saved to response:
+    my $response = $ua->head('http://localhost.localdomain/cgi-bin/mimetex.cgi?'.$texstring);
+    if ($response->is_success) {
+        #get the valign-value:
+        return($response->headers->{'vertical-align'});}
+    else {
+        return(0); #if (error) than continue without valign
+    }
+}
+
 sub mimetex_converted {
     my $texstring=shift;
     my $displaystyle=&displaystyle($texstring);
@@ -250,7 +266,8 @@ sub mimetex_converted {
     if ($displaystyle) {
 	$$texstring='\\displaystyle \\Large '.$$texstring;
     }
-    my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" />';
+
+   my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" style="vertical-align:'.&mimetex_valign($$texstring).'px" alt="$'.$$texstring.'$" />';
     if ($displaystyle) {
 	$result='<center>'.$result.'</center>';
     }
@@ -350,7 +367,7 @@ sub msgtexconverted {
 sub algebra {
     use AlgParser;
 
-    my ($string,$target,$style)=@_;
+    my ($string,$target,$style,$parstack,$safeeval)=@_;
     my $parser = new AlgParserWithImplicitExpand;
     $string=&prepare_algebra($string);
     my $ret = $parser->parse($string);
@@ -367,7 +384,9 @@ sub algebra {
 	    $latex='\\ensuremath{'.$latex.'}';
 	}
 	if ($target eq 'web' || $target eq 'analyze') {
-	    $result = &converted(\$latex);
+            my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
+            $result = &converted(\$latex,$display);
+#	    $result = &converted(\$latex);
 	} else {
 	    $result = $latex;
 	}
@@ -414,8 +433,78 @@ sub postprocess_algebra {
 __END__
 
 
+=pod
+
+=head1 NAME
+
+Apache::lontexconvert;
+
+=head1 SYNOPSIS
+
+Access to tth/ttm
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+
+=head1 SUBROUTINES
+
+=over
+
+=item init_tth()
+
+Header
+
+=item convert_real()
+
+ we need this routine because &converted can get called from inside
+ of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
+ allow the opcode for alarm, so we need to compile this before we get
+ into the safe space since opcode checks only occur at compile time
+
+=item tth_converted()
+
+
+=item clean_out_math_mode()
+
+
+=item displaystyle()
+
+
+=item jsMath_converted()
+
+
+=item tex_engine()
+
+
+=item init_math_support()
+
+
+=item mimetex_converted()
+
+
+=item converted()
+
+
+=item to_convert()
+
+message display
+
+=item smiley()
+
+???
+
+=item msgtexconverted()
+
+=item algebra()
+
+=item prepare_algebra()
+
+=item postprocess_algebra()
 
+=back
 
+=cut