[LON-CAPA-cvs] cvs: loncom /xml lontexconvert.pm

[riegler]

riegler		Thu Dec  4 19:53:53 2008 EDT

  Modified files:              
    /loncom/xml	lontexconvert.pm 
  Log:
  added call to mimetex_valign which destills the vertical alignment shift needed to vertically align mimetex-formula-images.
  Note that two calls are needed to mimetex.cgi.
  The first one (within mimetex_align) has the only purpose to strip the needed value from the HTTP header field. The second call gets the actual image.
  According to 
  http://forkosh.com/mimetex.html 
  this currently seems to be the only way to do it.
  Note, however, that the double call is not that detrimental w.r.t. to performance as mimetex on loncapa is configured such that images (and vertical alignment values) are cached.
  
  
  
Index: loncom/xml/lontexconvert.pm
diff -u loncom/xml/lontexconvert.pm:1.92 loncom/xml/lontexconvert.pm:1.93
--- loncom/xml/lontexconvert.pm:1.92	Thu Dec  4 09:51:14 2008
+++ loncom/xml/lontexconvert.pm	Thu Dec  4 19:53:53 2008
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.92 2008/12/04 09:51:14 hauer Exp $
+# $Id: lontexconvert.pm,v 1.93 2008/12/04 19:53:53 riegler Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -248,7 +248,7 @@
     $ua->timeout(10); 
     $ua->env_proxy;
     #header without imagedata saved to response:
-    my $response = $ua->head('http://lcdevhost.localdomain/cgi-bin/mimetex.cgi?'.$texstring);
+    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'});}
@@ -267,12 +267,7 @@
 	$$texstring='\\displaystyle \\Large '.$$texstring;
     }
 
-# FIXME
-# this is the line that calls the new function mimetex_valign above:
-#   my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" style="vertical-align:'.&mimetex_valign($$texstring).'px" alt="$'.$$texstring.'$" />';
-#
-# this line is the old implementation  without valign of the images:
-    my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" alt="$'.$$texstring.'$" />';
+   my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" style="vertical-align:'.&mimetex_valign($$texstring).'px" alt="$'.$$texstring.'$" />';
     if ($displaystyle) {
 	$result='<center>'.$result.'</center>';
     }