File:  [LON-CAPA] / loncom / homework / radiobuttonresponse.pm
Revision 1.149: download - view: text, annotated - select for diffs
Tue Jun 7 17:27:37 2011 UTC (12 years, 9 months ago) by www
Branches: MAIN
CVS tags: HEAD
Bug #5771: foil name 0 does not work

# The LearningOnline Network with CAPA
# mutliple choice style responses
#
# $Id: radiobuttonresponse.pm,v 1.149 2011/06/07 17:27:37 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#



package Apache::radiobuttonresponse;
use strict;
use HTML::Entities();
use Apache::lonlocal;
use Apache::lonnet;
use Apache::response;

my $default_bubbles_per_line = 10;


BEGIN {
    &Apache::lonxml::register('Apache::radiobuttonresponse',('radiobuttonresponse'));
}

sub bubble_line_count {
    my ($numfoils, $bubbles_per_line) = @_;
    my $bubble_lines;
    $bubble_lines = int($numfoils / $bubbles_per_line);
    if (($numfoils % $bubbles_per_line) != 0) {
	$bubble_lines++;
    }
    return $bubble_lines;
    
}


sub start_radiobuttonresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;

    #when in a radiobutton response use these
    &Apache::lonxml::register('Apache::radiobuttonresponse',('foilgroup','foil','conceptgroup'));
    push (@Apache::lonxml::namespace,'radiobuttonresponse');
    my $id = &Apache::response::start_response($parstack,$safeeval);

    %Apache::hint::radiobutton=();
    undef(%Apache::response::foilnames);
    if ($target eq 'meta') {
	$result=&Apache::response::meta_package_write('radiobuttonresponse');
    } elsif ($target eq 'edit' ) {
	$result.=&Apache::edit::start_table($token)
           .'<tr><td>'.&Apache::lonxml::description($token)
           .&Apache::loncommon::help_open_topic('Radio_Response_Problems')
           .'</td>'
           .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
           .&Apache::edit::deletelist($target,$token)
           .'</span></td>'
           .'<td>&nbsp;'.&Apache::edit::end_row()
           .&Apache::edit::start_spanning_row();
	$result.=
	    &Apache::edit::text_arg('Max Number Of Shown Foils:','max',
				    $token,'4').'&nbsp;'x 3 .
	    &Apache::edit::select_arg('Randomize Foil Order:','randomize',
				      ['yes','no'],$token).'&nbsp;'x 3 .
	    &Apache::edit::select_arg('Display Direction:','direction',
				      ['vertical','horizontal'],$token).
				      &Apache::edit::end_row().
				      &Apache::edit::start_spanning_row()."\n";
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'max',
						     'randomize','direction');
	if ($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}.}';
	} else {
	    $result .= ' \renewcommand{\labelenumi}{\Alph{enumi}.}';
	}
        if($env{'form.pdfFormFields'} eq 'yes' && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
            $result .= '\begin{itemize}';
        } else {
            $result .= '\begin{enumerate}';
        }
    } elsif ($target eq 'analyze') {
	my $part_id="$Apache::inputtags::part.$id";
        $Apache::lonhomework::analyze{"$part_id.type"} = 'radiobuttonresponse';
	push (@{ $Apache::lonhomework::analyze{"parts"} },$part_id);
    }
    return $result;
}

sub end_radiobuttonresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
    if ($target eq 'tex' ) {
        if($env{'form.pdfFormFields'} eq 'yes' and $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
            $result .= '\end{itemize}';
        } else {
            $result .= '\end{enumerate}';
        }
    }
    &Apache::response::end_response;
    pop @Apache::lonxml::namespace;
    &Apache::lonxml::deregister('Apache::radiobuttonresponse',('foilgroup','foil','conceptgroup'));
    undef(%Apache::response::foilnames);
    return $result;
}

%Apache::response::foilgroup=();
sub start_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    %Apache::response::foilgroup=();
    $Apache::radiobuttonresponse::conceptgroup=0;
    &Apache::response::pushrandomnumber(undef,$target);
    if ($target eq 'tex' && $Apache::lonhomework::type eq 'exam') {
	$result.='\item[\textbf{'.$Apache::lonxml::counter.'}.]';
    }
    return $result;
}

sub storesurvey {
    my ($style) = @_;
    if ( !&Apache::response::submitted() ) { return ''; }
    my $response = $env{'form.HWVAL_'.$Apache::inputtags::response['-1']};
    &Apache::lonxml::debug("Here I am!:$response:");
    if ( $response !~ /[0-9]+/) { return ''; }
    my $part = $Apache::inputtags::part;
    my $id = $Apache::inputtags::response['-1'];
    my @whichfoils=@{ $Apache::response::foilgroup{'names'} };
    my %responsehash;
    $responsehash{$whichfoils[$response]}=$response;
    my $responsestr=&Apache::lonnet::hash2str(%responsehash);
    $Apache::lonhomework::results{"resource.$part.$id.submission"}=
	$responsestr;
    my %previous=&Apache::response::check_for_previous($responsestr,$part,$id);
    my $ad;
    if ($style eq 'anonsurvey') {
        $ad=$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}='ANONYMOUS';
    } elsif ($style eq 'anonsurveycred') {
        $ad=$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}='ANONYMOUS_CREDIT';
    } elsif ($style eq 'surveycred') {
        $ad=$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}='SUBMITTED_CREDIT';
    } else {
        $ad=$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}='SUBMITTED';
    }
    &Apache::response::handle_previous(\%previous,$ad);
    &Apache::lonxml::debug("submitted a $response<br />\n");
    return '';
}


sub grade_response {
    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}),
								      $bubbles_per_line),
						   $bubbles_per_line);

    } else {
	$response = $env{'form.HWVAL_'.$Apache::inputtags::response['-1']};
    }


    if ( $response !~ /[0-9]+/) { return; }
    my $part=$Apache::inputtags::part;
    my $id = $Apache::inputtags::response['-1'];
    my %responsehash;
    $responsehash{$whichfoils->[$response]}=$response;
    my $responsestr=&Apache::lonnet::hash2str(%responsehash);
    my %previous=&Apache::response::check_for_previous($responsestr,
						       $part,$id);
    $Apache::lonhomework::results{"resource.$part.$id.submission"}=
	$responsestr;
    &Apache::lonxml::debug("submitted a $response<br />\n");
    my $ad;
    if ($response == $answer) {
	$ad='EXACT_ANS';
    } else {
	$ad='INCORRECT';
    }
    $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$ad;
    &Apache::response::handle_previous(\%previous,$ad);
}

sub end_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;

    my $result;
    my $bubble_lines;
    my $bubbles_per_line;
    my $answer_count;
    my $id   = $Apache::inputtags::response['-1'];
    my $part = $Apache::inputtags::part;
    $bubbles_per_line = 
	&Apache::response::get_response_param($Apache::inputtags::part."_$id",
					      'numbubbles',
					      $default_bubbles_per_line);


    if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
	$target eq 'tex' || $target eq 'analyze') {
	my $style = $Apache::lonhomework::type;
	my $direction = &Apache::lonxml::get_param('direction',$parstack,
						   $safeeval,'-2');
	if ( (($style eq 'survey') || ($style eq 'surveycred') || 
              ($style eq 'anonsurvey') || ($style eq 'anonsurveycred')) 
             && ($target ne 'analyze')) {
	    if ($target eq 'web' || $target eq 'tex') {
		$result=&displayallfoils($direction, $target);
	    } elsif ( $target eq 'answer' ) {
		$result=&displayallanswers();
	    } elsif ( $target eq 'grade' ) {
		$result=&storesurvey($style);
	    }
	    $answer_count = scalar(@{$Apache::response::foilgroup{'names'}});

	} else {

	    my $name;
	    my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,
						 '-2');
	    my $randomize = &Apache::lonxml::get_param('randomize',$parstack,
						       $safeeval,'-2');
	    my ($answer, @shown) = &whichfoils($max, $randomize);
	    $answer_count = scalar(@shown);

	    if ($target eq 'web' || $target eq 'tex') {
		$result=&displayfoils($target,
				      $answer, \@shown,
				      $direction,
				      $bubbles_per_line);
	    } elsif ($target eq 'answer' ) {
		$result=&displayanswers($answer, \@shown, $bubbles_per_line);
	    } elsif ( $target eq 'grade') {
		&grade_response($answer, \@shown, $bubbles_per_line);
	    }  elsif ( $target eq 'analyze') {
		my $bubble_lines = &bubble_line_count($answer_count, 
						      $bubbles_per_line);
		&Apache::response::analyze_store_foilgroup(\@shown,
							   ['text','value','location']);
		my $part_id="$part.$id";
		push (@{ $Apache::lonhomework::analyze{"$part_id.options"} },
		      ('true','false'));

	    }
	}
	$Apache::lonxml::post_evaluate=0;
    }
    if ($target eq 'web') {
	&Apache::response::setup_prior_tries_hash(\&format_prior_answer,
						  [\%Apache::response::foilgroup]);
    }
    &Apache::response::poprandomnumber();
    $bubble_lines = &bubble_line_count($answer_count, $bubbles_per_line);
    &Apache::lonxml::increment_counter($bubble_lines,
				       "$part.$id");
    if ($target eq 'analyze') {
	&Apache::lonhomework::set_bubble_lines();
    }
    return $result;
}

sub getfoilcounts {
    my @names;
    my $truecnt=0;
    my $falsecnt=0;
    my $name;
    if ( $Apache::response::foilgroup{'names'} ) {
	@names= @{ $Apache::response::foilgroup{'names'} };
    }
    foreach $name (@names) {
	if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
	    $truecnt++;
	} elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
	    $falsecnt++;
	}
    }
    return ($truecnt,$falsecnt);
}

sub format_prior_answer {
    my ($mode,$answer,$other_data) = @_;
    my $foil_data = $other_data->[0];
    my %response = &Apache::lonnet::str2hash($answer);
    my ($name)   = keys(%response);
    return '<span class="LC_prior_radiobutton">'.
	$foil_data->{$name.'.text'}.'</span>';

}

sub displayallfoils {
    my ($direction, $target)=@_;
    my $result;
    &Apache::lonxml::debug("survey style display");
    my @names;
    if ( $Apache::response::foilgroup{'names'} ) {
	@names= @{ $Apache::response::foilgroup{'names'} };
    }

    my $temp=0;
    my $i   =0;
    my $id=$Apache::inputtags::response['-1'];
    my $part=$Apache::inputtags::part;
    my ($lastresponse,$newvariation,$showanswer);
    if ((($Apache::lonhomework::history{"resource.$part.type"} eq 'randomizetry') ||
        ($Apache::lonhomework::type eq 'randomizetry')) &&
        ($Apache::inputtags::status[-1] eq 'CAN_ANSWER')) {
        if ($env{'form.'.$part.'.rndseed'} ne
            $Apache::lonhomework::history{"resource.$part.rndseed"}) {
            $newvariation = 1;
        }
    }
    $showanswer = &Apache::response::show_answer();
    unless ((($Apache::lonhomework::history{"resource.$part.type"} eq 'anonsurvey') || ($Apache::lonhomework::history{"resource.$part.type"} eq 'anonsurveycred')) && (defined($env{'form.grade_symb'})) ||
           ($newvariation && !$showanswer)) {
        $lastresponse = 
	    $Apache::lonhomework::history{"resource.$part.$id.submission"};
    }
    if ($direction eq 'horizontal') { $result.='<table><tr>'; }
    my %lastresponse=&Apache::lonnet::str2hash($lastresponse);
    if ($showanswer) {
	foreach my $name (@names) {
	    if ($Apache::response::foilgroup{$name.'.value'} ne 'unused') {
		if (($direction eq 'horizontal') && ($target ne 'tex')) {
		    $result.="<td>";
		} else {
		    if ($target eq 'tex') {
			$result .= '\item \vskip -2mm ';
		    } else {
			$result.="<br />";
		    }
		}
		if (defined($lastresponse{$name})) {
		    if ($target eq 'tex') {
			$result .= '}';
		    } else {
			$result.='<b>';
		    }
		}
		$result .= $Apache::response::foilgroup{$name.'.text'};
		if (defined($lastresponse{$name}) && ($target ne 'tex')) {
		    $result.='</b>';
		}
		if (($direction eq 'horizontal') && ($target ne 'tex')) { $result.="</td>"; }
	    }
	}
    } else {
	foreach my $name (@names) {
	    if ($Apache::response::foilgroup{$name.'.value'} ne 'unused') {
		if ($direction eq 'horizontal') {
		    $result.="<td>";
		} else {
		    if ($target eq 'tex') {
		        if($env{'form.pdfFormFields'} eq 'yes' && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
                            my $fieldname = $env{'request.symb'}.'&part_'. $Apache::inputtags::part
                                            .'&radiobuttonresponse'.'&HWVAL_'.$Apache::inputtags::response['-1'];
                            $result .= '\item[{'.&Apache::lonxml::print_pdf_radiobutton($fieldname,$temp).'}]'
                                       .$Apache::response::foilgroup{$name.'.text'}."\n";
                        } else {
                            $result .= '\item \vskip -2mm ';
                        }
                    } else {
			$result.="<br />";
		    }
		}
		if ($target eq 'tex') {
		    if($env{'form.pdfFormFields'} ne 'yes' or $Apache::inputtags::status[-1] ne 'CAN_ANSWER') {
                        $result .= '$\bigcirc$'.$Apache::response::foilgroup{$name.'.text'}.'\\\\';  #' stupid emacs
                    }
		    $i++;
		} else {
		    $result .= '<label>';
		    $result.="<input
                       onchange=\"javascript:setSubmittedPart('$part');\"
                       type=\"radio\"
                       name=\"HWVAL_$Apache::inputtags::response['-1']\"
                       value=\"$temp\"";

		    if (defined($lastresponse{$name})) { $result .= ' checked="checked"'; }
		    $result .= ' />'.$Apache::response::foilgroup{$name.'.text'}.
			'</label>';
		}
		$temp++;
		if ($target ne 'tex') {
		    if (($direction eq 'horizontal') && ($target ne 'tex')) { $result.="</td>"; }
		} else {
		    $result.='\vskip 0 mm ';
		}
	    }
	}
    }
    
    if (($direction eq 'horizontal') && ($target ne 'tex')) { $result.='</tr></table>'; }
    return $result;
}


sub whichfoils {
    my ($max,$randomize)=@_;

    my @truelist;
    my @falselist;
    my @whichfalse =();
    my ($truecnt,$falsecnt) = &getfoilcounts();
    my $count=0;
    # we will add in 1 of the true statements
    if ( $max>0 && ($falsecnt+1)>$max) { $count=$max } else { $count=$falsecnt+1; $max=$count; }
    my $answer=int(&Math::Random::random_uniform() * ($count));
    &Apache::lonxml::debug("Count is $count, $answer is $answer");
    my @names;
    if ( $Apache::response::foilgroup{'names'} ) {
	@names= @{ $Apache::response::foilgroup{'names'} };
    }
    if (&Apache::response::showallfoils()) {
	@whichfalse=@names;
    } elsif ($randomize eq 'no') {
	&Apache::lonxml::debug("No randomization");
	my $havetrue=0;
	foreach my $name (@names) {
	    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
		if (!$havetrue ) {
		    push(@whichfalse,$name); $havetrue++; $answer=$#whichfalse;
		}
	    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
		push (@whichfalse,$name);
	    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {
	    } else {
		&Apache::lonxml::error(&HTML::Entities::encode("No valid value assigned ($Apache::response::foilgroup{$name.'.value'}) for foil $name in <foilgroup>",'<>&"'));
	    }
	}
	if ((!$havetrue) && 
            ($Apache::lonhomework::type ne 'survey') && 
            ($Apache::lonhomework::type ne 'surveycred') &&
            ($Apache::lonhomework::type ne 'anonsurvey') &&
            ($Apache::lonhomework::type ne 'anonsurveycred')) {
	    &Apache::lonxml::error(&mt('There are no true statements available.').'<br />');
	}
    } else {
	my $current=0;
	&Apache::lonhomework::showhash(%Apache::response::foilgroup);
	my (%top,%bottom);
	#first find out where everyone wants to be
	foreach my $name (@names) {
	    $current++;
	    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
		push (@truelist,$name);
		if ($Apache::response::foilgroup{$name.'.location'} eq 'top') {
		    $top{$name}=$current;
		} elsif ($Apache::response::foilgroup{$name.'.location'} eq 'bottom') {
		    $bottom{$name}=$current;
		}
	    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
		push (@falselist,$name);
		if ($Apache::response::foilgroup{$name.'.location'} eq 'top') {
		    $top{$name}=$current;
		} elsif ($Apache::response::foilgroup{$name.'.location'} eq 'bottom') {
		    $bottom{$name}=$current;
		}
	    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {
	    } else {
		&Apache::lonxml::error(&HTML::Entities::encode("No valid value assigned ($Apache::response::foilgroup{$name.'.value'}) for foil $name in <foilgroup>",'<>&"'));
	    }
	}
	#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+$topcount+$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");
	    $afalse=splice(@falselist,$afalse,1);
	    &Apache::lonxml::debug("Picked $afalse");
	    &Apache::lonhomework::showhash(('names'=>\@names));
	    &Apache::lonhomework::showhash(%top);
	    if ($top{$afalse}) {
		$toplist[$top{$afalse}]=$afalse;
		$topcount++;
	    } elsif ($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) && 
            ($Apache::lonhomework::type ne 'survey') &&
            ($Apache::lonhomework::type ne 'surveycred') &&
            ($Apache::lonhomework::type ne 'anonsurvey') &&
            ($Apache::lonhomework::type ne 'anonsurveycred')) {
	    $dosplice=0;
	    &Apache::lonxml::error(&mt('There are no true statements available.').'<br />');
	}
	#insert the true statement, keeping track of where it wants to be
	if ($Apache::response::foilgroup{$truename.'.location'} eq 'top' && $dosplice) {
	    $toplist[$top{$truename}]=$truename;
	    $answer=-1;
	    foreach my $top (reverse(@toplist)) {
		if ($top) { $answer++;}
		if ($top eq $truename) { last; }
	    }
	    $dosplice=0;
	} elsif ($Apache::response::foilgroup{$truename.'.location'} eq 'bottom' && $dosplice) {
	    $bottomlist[$bottom{$truename}]=$truename;
	    $answer=-1;
	    foreach my $bot (@bottomlist) {
		if ($bot) { $answer++;}
		if ($bot eq $truename) { last; }
	    }
	    $answer+=$topcount+$#whichfalse+1;
	    $dosplice=0;
	} else {
	    if ($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]) }
	}
	for (my $i=0;$i<=$#bottomlist;$i++) {
	    if ($bottomlist[$i]) { push(@whichfalse,$bottomlist[$i]) }
	}
	#if the true statement is randomized insert it into the list
	if ($dosplice) { splice(@whichfalse,$answer,0,$truelist[$whichtrue]); }
    }
    &Apache::lonxml::debug("Answer is $answer");
    return ($answer,@whichfalse);
}

sub displayfoils {
    my ($target,$answer,$whichfoils,$direction, $bubbles_per_line)=@_;
    my $result;

    my $part=$Apache::inputtags::part;
    my $solved=$Apache::lonhomework::history{"resource.$part.solved"};
    if ( ($target ne 'tex') &&
	 &Apache::response::show_answer() ) {
	if ($direction eq 'horizontal') {
	    if ($target ne 'tex') {
		$result.='<table><tr>';
	    }
	}
	foreach my $name (@{ $whichfoils }) {
	    if ($direction eq 'horizontal') {
		if ($target ne 'tex') { $result.='<td>'; }
	    }
	    if ($target ne 'tex') {
		$result.="<br />";
	    } else {
		$result.='\item \vskip -2 mm  ';
	    }
	    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') { 
		if ($target ne 'tex') {
                    $result.=&mt('Correct:').'<b>';
                } else {
                    $result.=&mt('Correct:').' \textbf{';
                }
	    } else {
		$result.=&mt('Incorrect:');
	    }
	    if ($target eq 'web') { $result.="<label>"; }
	    $result.=$Apache::response::foilgroup{$name.'.text'};
	    if ($target eq 'web') { $result.="</label>"; }
	    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
		if ($target ne 'tex') { $result.='</b>';} else {$result.='}';}
	    }
	    if ($direction eq 'horizontal') {
		if ($target ne 'tex') { $result.='</td>'; }
	    }
	}
	if ($direction eq 'horizontal') {
	    if ($target ne 'tex') {
		$result.='</tr></table>';
	    }
	}
    } else {
	my @alphabet = ('A'..'Z');
	my $i = 0;
	my $bubble_number = 0;
	my $line = 0;
	my $temp=0;  
	my $id=$Apache::inputtags::response['-1'];
	my $part=$Apache::inputtags::part;
        my ($lastresponse,$newvariation);
        if ((($Apache::lonhomework::history{"resource.$part.type"} eq 'randomizetry') ||
             ($Apache::lonhomework::type eq 'randomizetry')) && 
        ($Apache::inputtags::status[-1] eq 'CAN_ANSWER')) {
            if ($env{'form.'.$part.'.rndseed'} ne
                $Apache::lonhomework::history{"resource.$part.rndseed"}) {
                $newvariation = 1;
            }
        }
        unless ($newvariation) {
	    $lastresponse=$Apache::lonhomework::history{"resource.$part.$id.submission"};
        }
	my %lastresponse=&Apache::lonnet::str2hash($lastresponse);
	if ($target ne 'tex' && $direction eq 'horizontal') {
	    $result.="<table><tr>";
	}
	foreach my $name (@{ $whichfoils }) {
	    if ($target ne 'tex') {
		if ($direction eq 'horizontal') {
		    $result.="<td>"; 
		} else { 
		    $result.="<br />";
		} 
	    }
	    if ($target ne 'tex') { 
                $result.= '<label>';
		$result.=
		    "<input type=\"radio\"
                            onchange=\"javascript:setSubmittedPart('$part');\"
                            name=\"HWVAL_$Apache::inputtags::response['-1']\"
                            value=\"$temp\"";
		if (defined($lastresponse{$name})) { $result .= ' checked="checked"'; }
		$result .= ' />'.$Apache::response::foilgroup{$name.'.text'}."</label>";
	    } else {
		if ($Apache::lonhomework::type eq 'exam') {
		    if($bubble_number >= $bubbles_per_line) {
			$line++;
			$i = 0;
			$bubble_number = 0;
			$result.='\item[\textbf{'.($Apache::lonxml::counter+$line).'}.]';
		    }
		    $result .= '{\small \textbf{'.$alphabet[$i].'}}$\bigcirc$'.$Apache::response::foilgroup{$name.'.text'}.'\\\\';  #' stupid emacs
		    $i++;
		    $bubble_number++;
		} else {
                    if($env{'form.pdfFormFields'} eq 'yes' && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
                        my $fieldname = $env{'request.symb'}.'&part_'. $Apache::inputtags::part
                                        .'&radiobuttonresponse'.'&HWVAL_'.$Apache::inputtags::response['-1'];
                        $result .= '\item[{'.&Apache::lonxml::print_pdf_radiobutton($fieldname,$temp).'}]'
                                   .$Apache::response::foilgroup{$name.'.text'}."\n";
                    } else { 
                        $result .= '\vspace*{-2 mm}\item '.$Apache::response::foilgroup{$name.'.text'};
                    }
                }
	    }
	    if ($target ne 'tex' && $direction eq 'horizontal') {
		$result.="</td>"; 
	    }
	    $temp++;
	}
	if ($target ne 'tex' && $direction eq 'horizontal') {
	    $result.="</tr></table>";
	}
    }
    if ($target ne 'tex') { if ($direction ne 'horizontal') { $result.="<br />";} } else { $result.='\vskip 0 mm '; }
    return $result;
}

sub displayallanswers {
    my @names;
    if ( $Apache::response::foilgroup{'names'} ) {
	@names= @{ $Apache::response::foilgroup{'names'} };
    }
    my $result=&Apache::response::answer_header('radiobuttonresponse');
    foreach my $name (@names) {
	$result.=&Apache::response::answer_part('radiobuttonresponse',
				$Apache::response::foilgroup{$name.'.value'});
    }
    $result.=&Apache::response::answer_footer('radiobuttonresponse');
    return $result;
}

sub displayanswers {
    my ($answer, $whichopt, $bubbles_per_line)=@_;
    my $result;

    if ($Apache::lonhomework::type eq 'exam') {
	my $line = int($answer/$bubbles_per_line);
	my $correct = ('A'..'Z')[$answer%$bubbles_per_line];
	$result .= &Apache::response::answer_header('radiobuttonresponse',
						    $line);
	$result .= &Apache::response::answer_part('radiobuttonresponse',
						  $correct);
    } else {
	$result .= &Apache::response::answer_header('radiobuttonresponse');
    }
    foreach my $name (@{ $whichopt }) {
	$result.=&Apache::response::answer_part('radiobuttonresponse',
						$Apache::response::foilgroup{$name.'.value'});
    }
    $result.=&Apache::response::answer_footer('radiobuttonresponse');
    return $result;
}

sub start_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    $Apache::radiobuttonresponse::conceptgroup=1;
    %Apache::response::conceptgroup=();
    my $result;
    if ($target eq 'edit') {
	$result.=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::text_arg('Concept:','concept',$token,'50').
	    &Apache::edit::end_row().&Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'concept');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

sub end_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    $Apache::radiobuttonresponse::conceptgroup=0;
    my $result;
    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer'  ||
	$target eq 'tex' || $target eq 'analyze') {
	&Apache::response::pick_foil_for_concept($target,
						 ['value','text','location'],
						 \%Apache::hint::radiobutton,
						 $parstack,$safeeval);
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::end_table();
    }
    return $result;
}

sub insert_conceptgroup {
    my $result="\n\t\t<conceptgroup concept=\"\">".&insert_foil()."\n\t\t</conceptgroup>\n";
    return $result;
}

sub start_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result='';
    if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') {
	&Apache::lonxml::startredirection;
	if ($target eq 'analyze') {
	    &Apache::response::check_if_computed($token,$parstack,$safeeval,'value');
	}
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::text_arg('Name:','name',$token);
	$result.=&Apache::edit::select_or_text_arg('Correct Option:','value',
						   ['unused','true','false'],
						   $token);
	my $randomize=&Apache::lonxml::get_param('randomize',$parstack,
						 $safeeval,'-3');
	if ($randomize ne 'no') {
	    $result.=&Apache::edit::select_arg('Location:','location',
					       ['random','top','bottom'],$token);
	}
	$result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'value','name',
						     'location');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    } 
    return $result;
}

sub end_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $text='';
    if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') {
	$text=&Apache::lonxml::endredirection;
    }
    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer'
	|| $target eq 'tex' || $target eq 'analyze') {
	my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
	if ($value ne 'unused') {
	    my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
	    if ($name eq "") {
		&Apache::lonxml::warning(&mt('Foils without names exist. This can cause problems to malfunction.'));
		$name=$Apache::lonxml::curdepth;
	    }
            if ($name eq "0") {
                &Apache::lonxml::error(&mt('Foil name [_1] is not supported. Please choose another name.','<b><tt>'.$name.'</tt></b>'));
            }
	    if (defined($Apache::response::foilnames{$name})) {
		&Apache::lonxml::error(&mt('Foil name [_1] appears more than once. Foil names need to be unique.','<b><tt>'.$name.'</tt></b>'));
	    }
	    $Apache::response::foilnames{$name}++;
	    my $location =&Apache::lonxml::get_param('location',$parstack,
						     $safeeval);
	    if ( $Apache::radiobuttonresponse::conceptgroup
		 && !&Apache::response::showallfoils() ) {
		push @{ $Apache::response::conceptgroup{'names'} }, $name;
		$Apache::response::conceptgroup{"$name.value"} = $value;
		$Apache::response::conceptgroup{"$name.text"} = $text;	
		$Apache::response::conceptgroup{"$name.location"} = $location;
	    } else {
		push @{ $Apache::response::foilgroup{'names'} }, $name;
		$Apache::response::foilgroup{"$name.value"} = $value;
		$Apache::response::foilgroup{"$name.text"} = $text;
		$Apache::response::foilgroup{"$name.location"} = $location;
	    }
	}
    }
    return '';
}

sub insert_foil {
    return '
<foil name="" value="unused">
<startouttext />
<endouttext />
</foil>';
}
1;
__END__



=head1 NAME

Apache::radiobuttonresponse

=head1 SYNOPSIS

Handles multiple-choice style responses.

This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.

=head1 SUBROUTINES

=over

=item start_radiobuttonresponse()

=item bubble_line_count()

=item end_radiobuttonresponse()

=item start_foilgroup()

=item storesurvey()

=item grade_response()

=item end_foilgroup()

=item getfoilcounts()

=item format_prior_answer()

=item displayallfoils()

=item &whichfoils($max,$randomize)

Randomizes the list of foils.
Respects
  - each foils desire to be randomized
  - the existance of Concept groups of foils (select 1 foil from each)
  - 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)

  $randomize - whether to randomize the listing of foils, by default
               will randomize, only if randomize is 'no' will it not

Returns
  $answer - location in the array of the correct answer
  @foils  - array of foil names in to display order

=item displayfoils()

=item displayallanswers()

=item displayanswers()

=item start_conceptgroup()

=item end_conceptgroup()

=item insert_conceptgroup()

=item start_foil()

=item end_foil()

=item insert_foil()

=back

=cut
 

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