--- loncom/homework/radiobuttonresponse.pm	2003/04/18 06:26:43	1.69
+++ loncom/homework/radiobuttonresponse.pm	2003/10/24 18:06:06	1.76
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # mutliple choice style responses
 #
-# $Id: radiobuttonresponse.pm,v 1.69 2003/04/18 06:26:43 albertel Exp $
+# $Id: radiobuttonresponse.pm,v 1.76 2003/10/24 18:06:06 sakharuk Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -62,6 +62,16 @@ sub start_radiobuttonresponse {
 						 $safeeval,'max','randomize');
     if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
   } elsif ($target eq 'tex') {
+      my $type=&Apache::lonxml::get_param('TeXtype',$parstack,$safeeval,undef,0);
+      if ($type eq '1') {
+	  $result .= ' \renewcommand{\labelenumi}{\arabic{enumi}.}';
+      } elsif ($type eq 'A') {
+	  $result .= ' \renewcommand{\labelenumi}{\Alph{enumi}.}';
+      } elsif ($type eq 'a') {
+	  $result .= ' \renewcommand{\labelenumi}{\alph{enumi}.}';
+      } elsif ($type eq 'i') {
+	  $result .= ' \renewcommand{\labelenumi}{\roman{enumi}.}';
+      }
       $result .= '\begin{enumerate}';
   }
   return $result;
@@ -195,7 +205,7 @@ sub displayallfoils {
   my $part=$Apache::inputtags::part;
   my $lastresponse=$Apache::lonhomework::history{"resource.$part.$id.submission"};
   my %lastresponse=&Apache::lonnet::str2hash($lastresponse);
-  if (($Apache::lonhomework::history{"resource.$part.solved"} =~ /^correct/)  || ($Apache::inputtags::status[-1] eq  'SHOW_ANSWER')) {
+  if (&Apache::response::show_answer() ) {
     foreach my $name (@names) {
       if ($Apache::response::foilgroup{$name.'.value'} ne 'unused') {
 	$result.="<br />".$Apache::response::foilgroup{$name.'.value'};
@@ -281,13 +291,16 @@ sub whichfoils {
 	}
     }
     #pick a true statement
+    my $notrue=0;
+    if (scalar(@truelist) == 0) { $notrue=1; }
     my $whichtrue = int(&Math::Random::random_uniform() * ($#truelist+1));
     &Apache::lonxml::debug("Max is $max, From $#truelist elms, picking $whichtrue");
     my (@toplist, @bottomlist);
     my $topcount=0;
+    my $bottomcount=0;
     # assign everyone to either toplist/bottomlist or whichfalse
     # which false is randomized, toplist bottomlist are in order
-    while ((($#whichfalse) < $max-2) && ($#falselist > -1)) {
+    while ((($#whichfalse+$topcount+$bottomcount) < $max-2) && ($#falselist > -1)) {
 	&Apache::lonxml::debug("Have $#whichfalse max is $max");
 	my $afalse=int(&Math::Random::random_uniform() * ($#falselist+1));
 	&Apache::lonxml::debug("From $#falselist elms, picking $afalse");
@@ -300,14 +313,20 @@ sub whichfoils {
 	    $topcount++;
 	} elsif ($bottom{$afalse}) {
 	    $bottomlist[$bottom{$afalse}]=$afalse;
+	    $bottomcount++;
 	} else {
 	    push (@whichfalse,$afalse);
 	}
     }
+    &Apache::lonxml::debug("Answer wants $answer");
     my $truename=$truelist[$whichtrue];
     my $dosplice=1;
+    if ($notrue) {
+	$dosplice=0;
+	&Apache::lonxml::error("There are no true statements available.<br />");
+    }
     #insert the true statement, keeping track of where it wants to be
-    if ($Apache::response::foilgroup{$truename.'.location'} eq 'top' ) {
+    if ($Apache::response::foilgroup{$truename.'.location'} eq 'top' && $dosplice) {
 	$toplist[$top{$truename}]=$truename;
 	$answer=-1;
 	foreach my $top (reverse(@toplist)) {
@@ -315,7 +334,7 @@ sub whichfoils {
 	    if ($top eq $truename) { last; }
 	}
 	$dosplice=0;
-    } elsif ($Apache::response::foilgroup{$truename.'.location'} eq 'bottom') {
+    } elsif ($Apache::response::foilgroup{$truename.'.location'} eq 'bottom' && $dosplice) {
 	$bottomlist[$bottom{$truename}]=$truename;
 	$answer=-1;
 	foreach my $bot (@bottomlist) {
@@ -325,11 +344,12 @@ sub whichfoils {
 	$answer+=$topcount+$#whichfalse+1;
 	$dosplice=0;
     } else {
-	if ($topcount>0) { 
-	  $answer = int(&Math::Random::random_uniform() * ($#whichfalse+1))
-	    + $topcount;
+	if ($topcount>0 || $bottomcount>0) {
+	    $answer = int(&Math::Random::random_uniform() * ($#whichfalse+1))
+		+ $topcount;
 	}
     }
+    &Apache::lonxml::debug("Answer now wants $answer");
     #add the top items to the top, bottom items to the bottom
     for (my $i=0;$i<=$#toplist;$i++) {
 	if ($toplist[$i]) { unshift(@whichfalse,$toplist[$i]) }
@@ -351,9 +371,8 @@ sub displayfoils {
   my ($answer,@whichfoils)=&whichfoils($max,$randomize);
   my $part=$Apache::inputtags::part;
   my $solved=$Apache::lonhomework::history{"resource.$part.solved"};
-  my $status=$Apache::inputtags::status[-1];
   if ( ($target ne 'tex') &&
-       (($solved =~ /^correct/) || ($status eq  'SHOW_ANSWER')) ) {
+       &Apache::response::show_answer() ) {
     foreach my $name (@whichfoils) {
       if ($target ne 'tex') {
 	  $result.="<br />";