--- loncom/homework/radiobuttonresponse.pm	2007/06/29 17:24:03	1.122
+++ loncom/homework/radiobuttonresponse.pm	2007/06/29 17:32:31	1.123
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # mutliple choice style responses
 #
-# $Id: radiobuttonresponse.pm,v 1.122 2007/06/29 17:24:03 albertel Exp $
+# $Id: radiobuttonresponse.pm,v 1.123 2007/06/29 17:32:31 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -158,15 +158,14 @@ sub storesurvey {
 
 
 sub grade_response {
-    my ($max,$randomize, $bubbles_per_line)=@_;
-    #keep the random numbers the same must always call this
-    my ($answer,@whichfoils)=&whichfoils($max,$randomize);
+    my ($answer, $whichfoils, $bubbles_per_line)=@_;
+
     if ( !&Apache::response::submitted() ) { return; }
     my $response;
     
     if ($env{'form.submitted'} eq 'scantron') {
 	$response = &Apache::response::getresponse(1,undef,
-						   &bubble_line_count(scalar(@whichfoils),
+						   &bubble_line_count(scalar(@{ $whichfoils}),
 								      $bubbles_per_line),
 						   $bubbles_per_line);
 
@@ -179,7 +178,7 @@ sub grade_response {
     my $part=$Apache::inputtags::part;
     my $id = $Apache::inputtags::response['-1'];
     my %responsehash;
-    $responsehash{$whichfoils[$response]}=$response;
+    $responsehash{$whichfoils->[$response]}=$response;
     my $responsestr=&Apache::lonnet::hash2str(%responsehash);
     my %previous=&Apache::response::check_for_previous($responsestr,
 						       $part,$id);
@@ -232,20 +231,18 @@ sub end_foilgroup {
 						 '-2');
 	    my $randomize = &Apache::lonxml::get_param('randomize',$parstack,
 						       $safeeval,'-2');
-	    my ($answer,@shown) = &whichfoils($max,$randomize);
+	    my ($answer, @shown) = &whichfoils($max, $randomize);
 	    $answer_count = scalar(@shown);
 
 	    if ($target eq 'web' || $target eq 'tex') {
 		$result=&displayfoils($target,
-				      $max,
-				      $randomize,
+				      $answer, \@shown,
 				      $direction,
 				      $bubbles_per_line);
 	    } elsif ($target eq 'answer' ) {
-		$result=&displayanswers($max,$randomize);
+		$result=&displayanswers($answer, \@shown);
 	    } elsif ( $target eq 'grade') {
-		&grade_response($max,$randomize,
-                                $bubbles_per_line);
+		&grade_response($answer, \@shown, $bubbles_per_line);
 	    }  elsif ( $target eq 'analyze') {
 		&Apache::response::analyze_store_foilgroup(\@shown,
 							   ['text','value','location']);
@@ -389,6 +386,10 @@ Respects
   - and selects a single correct statement from all possilble true statments
   - and limits it to a toal of $max foils
 
+WARNING: this routine uses the random number generator, it should only
+be called once per target, otherwise it can cause randomness changes in
+homework problems.
+
 Arguments
   $max - maximum number of foils to select (including the true one)
          (so a max of 5 is: 1 true, 4 false)
@@ -539,10 +540,9 @@ sub whichfoils {
 }
 
 sub displayfoils {
-    my ($target,$max,$randomize,$direction, $bubbles_per_line)=@_;
+    my ($target,$answer,$whichfoils,$direction, $bubbles_per_line)=@_;
     my $result;
 
-    my ($answer,@whichfoils)=&whichfoils($max,$randomize);
     my $part=$Apache::inputtags::part;
     my $solved=$Apache::lonhomework::history{"resource.$part.solved"};
     if ( ($target ne 'tex') &&
@@ -552,7 +552,7 @@ sub displayfoils {
 		$result.='<table><tr>';
 	    }
 	}
-	foreach my $name (@whichfoils) {
+	foreach my $name (@{ $whichfoils }) {
 	    if ($direction eq 'horizontal') {
 		if ($target ne 'tex') { $result.='<td>'; }
 	    }
@@ -593,7 +593,7 @@ sub displayfoils {
 	if ($target ne 'tex' && $direction eq 'horizontal') {
 	    $result.="<table><tr>";
 	}
-	foreach my $name (@whichfoils) {
+	foreach my $name (@{ $whichfoils }) {
 	    if ($target ne 'tex') {
 		if ($direction eq 'horizontal') {
 		    $result.="<td>"; 
@@ -652,15 +652,14 @@ sub displayallanswers {
 }
 
 sub displayanswers {
-    my ($max,$randomize)=@_;
-    my ($answer,@whichopt) = &whichfoils($max,$randomize);
+    my ($answer, $whichopt)=@_;
     my $result=&Apache::response::answer_header('radiobuttonresponse');
     if ($Apache::lonhomework::type eq 'exam') {
 	my $correct = ('A'..'Z')[$answer];
 	$result.=&Apache::response::answer_part('radiobuttonresponse',
 						$correct);
     }
-    foreach my $name (@whichopt) {
+    foreach my $name (@{ $whichopt }) {
 	$result.=&Apache::response::answer_part('radiobuttonresponse',
 						$Apache::response::foilgroup{$name.'.value'});
     }