Diff for /loncom/homework/radiobuttonresponse.pm between versions 1.3 and 1.162

version 1.3, 2001/01/08 22:06:48 version 1.162, 2018/12/19 04:07:35
Line 1 Line 1
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # mutliple choice style responses  # mutliple choice style responses
   #
   # $Id$
   #
   # 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/
   #
   
   
 # 11/23,11/24,11/28 Gerd Kortemeyer  
   
 package Apache::radiobuttonresponse;  package Apache::radiobuttonresponse;
 use strict;  use strict;
   use HTML::Entities();
   use Apache::lonlocal;
   use Apache::lonnet;
   use Apache::response;
   use Apache::caparesponse;
   
   my $default_bubbles_per_line = 10;
   my @alphabet      = ( 'A' .. 'Z' ); # Foil labels.
   
   
   
   
   BEGIN {
       &Apache::lonxml::register('Apache::radiobuttonresponse',('radiobuttonresponse'));
   }
   
   #---------------------------------------------------------------------------
   #
   #  Generic utility subs.
   
 sub BEGIN {  sub bubble_line_count {
   &Apache::lonxml::register('Apache::radiobuttonresponse',('radiobuttonresponse'));      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;
       
 }  }
   
   
   
   #------------------------------------------------------------------------------
   #
   #  XML handlers.
 sub start_radiobuttonresponse {  sub start_radiobuttonresponse {
   #when in a radiobutton response use these      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   &Apache::lonxml::register('Apache::radiobuttonresponse',('foilgroup','foil'));      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::loncommon::insert_folding_button()
              .&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',
       $token,'4').
       &Apache::edit::select_arg('Randomize Foil Order:','randomize',
         ['yes','no'],$token).
       &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}.}';
           }
   
       }
       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 {  sub end_radiobuttonresponse {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result;
       if ( $target eq 'edit' ) { 
    $result = &Apache::edit::end_table(); 
       }
       &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={};  %Apache::response::foilgroup=();
 sub start_foilgroup {  sub start_foilgroup {
   %Apache::response::foilgroup={};      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       %Apache::response::foilgroup=();
       $Apache::radiobuttonresponse::conceptgroup=0;
       &Apache::response::pushrandomnumber(undef,$target);
       return;
   }
   
   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 {  sub end_foilgroup {
   my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $name;  
   my $result;      my $result;
   my @names = @{ $Apache::response::foilgroup{'names'} };      my $bubble_lines;
   my @truelist;      my $answer_count;
   my @falselist;      my $id   = $Apache::inputtags::response['-1'];
   foreach $name (@names) {      my $part = $Apache::inputtags::part;
     $result.="<br><b>$name</b> is <i> $Apache::response::foilgroup{$name.'.value'} </i>";      my $bubbles_per_line = &getbubblesnum($part,$id);
     if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {  
       push (@truelist,$name);  
     } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {      if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
       push (@falselist,$name);   $target eq 'tex' || $target eq 'analyze') {
     } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {   my $style = $Apache::lonhomework::type;
     } else {   my $direction = &Apache::lonxml::get_param('direction',$parstack,
       &Apache::lonxml::error("Unknow state $Apache::response::foilgroup{$name.'.value'} for $name in <foilgroup>");     $safeeval,'-2');
     }   if ( (($style eq 'survey') || ($style eq 'surveycred') || 
   }                ($style eq 'anonsurvey') || ($style eq 'anonsurveycred')) 
   my $whichtrue = rand $#truelist;               && ($target ne 'analyze')) {
   return $result;      if ($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 $result;
   }
   sub getbubblesnum {
       my ($part,$id) = @_;
       my $bubbles_per_line;
       my $default_numbubbles = $default_bubbles_per_line;
       if (($env{'form.bubbles_per_row'} =~ /^\d+$/) &&
           ($env{'form.bubbles_per_row'} > 0)) {
           $default_numbubbles = $env{'form.bubbles_per_row'};
       }
       $bubbles_per_line =
           &Apache::response::get_response_param($part."_$id",'numbubbles',
                                                 $default_numbubbles);
       return $bubbles_per_line;
   }
   
   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>';
   
   }
   
   
   ## 
   # Return the last survey response.  The logic is slightly different than that of 
   # get_last_responses.  TODO: See if there are chunks of code betweenthis and
   # get_last_reponses that are common and can be factored.
   #
   # @param $part - Problem part under consideration.
   # @param $showanswer - True if answers should be shown.
   # @param $id         - Problem id.
   #
   # @return hash reference.
   # @retval reference to the has indexed by answer selection that 
   #         indicates the most recent answer.
   #
   sub get_last_survey_response {
       my ($part, $showanswer, $id) = @_;
   
       my $newvariation;
       my $lastresponse; # stringified last response.
   
       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;
           }
       }
       $showanswer = &Apache::response::show_answer();
       unless ($newvariation && !$showanswer) {
           if ((($env{'form.grade_username'} eq '') && ($env{'form.grade_domain'} eq '')) ||
               (($env{'form.grade_username'} eq $env{'user.name'}) &&
                ($env{'form.grade_domain'} eq $env{'user.domain'}))) {
               $lastresponse = $Apache::lonhomework::history{"resource.$part.$id.submission"};
           } else {
               unless (($Apache::lonhomework::history{"resource.$part.type"} eq 'anonsurvey') ||
                       ($Apache::lonhomework::history{"resource.$part.type"} eq 'anonsurveycred')) {
                   $lastresponse = $Apache::lonhomework::history{"resource.$part.$id.submission"};
               }
           }
       }
       my %lastresponse = &Apache::lonnet::str2hash($lastresponse);
   
       return \%lastresponse;
   
   }
   ##
   # Removes the names from a foil group that are marked as unused.
   #
   # @param $names - reference to the array of names to filter.
   #
   # @return arrayref
   # @retval reference to the filtered array.
   #
   sub remove_unused {
       my ($names) = @_;
       my @result;
   
       foreach my $name (@{$names}) {
    if ($Apache::response::foilgroup{$name . '.value'} ne 'unused') {
       push(@result, $name);
    }
       }
       return \@result;
   }
   ## 
   # Displays all foils in a survey type problem for HTML rendition.
   # TODO: See if there is any logic in this sub that can be shared
   #      with display_foils_html
   #
   # @param $names        - ref to array of names of the foils to display.
   # @param $part         - Problem part number.
   # @param $showanswer   - If true, show the answers.
   # @param $lastresponse - Ref to the last response hash.
   # @param $direction    - Display direction of the radiobuttons.
   #
   # @return string
   # @retval HTML required to display the resource in a browser.
   #
   sub display_survey_html {
       my ($names, $part, $showanswer, $lastresponse, $direction) = @_;
       my $result;
   
       # Figure out a few fragments of html that depend onthe 
       # orientation of the radiobuttons:
       # closing_html - HTML to emit at the end of the resource.
       # pre_foil     - HTML to emit prior to each foil.
       # post_foil    - HTML to emit following each foil.
       #
       #  The opening HTML is just added to the $result now
       #
       #  Figuring these outin advance compresses the loop over foils into something
       #  pretty simple:
       #
       # NOTE: There's probably a really cool way to do this with style sheets
       #       and picking the selector based on the orientation, if someone wants to puzzle
       #       that out.  In that case, probably the whole thing lives in a <div> and each
       #       foil lives in a <p>
       #
   
   
       my ($opening_html, $closing_html, $pre_foil, $post_foil) = 
    &html_direction_fragments($direction);
   
       $result = $opening_html;
   
       # Different rendering depending on whether answers are shown:
       # I played with different factorings but this seems the most concise/clear...
       # although I don't like the $showanswer conditino inside the loop.  Other things I tried
       #  - two loops..much longer code..no gain in clarity.
       #  - Using a visitor patttern passing it the rendering code chunklets and
       #    an anonymous hash reference for state data etc. Very cool but
       #    quite a bit more code and quite a bit less clear.
       
       my $temp = 0;
       foreach my $name (@{$names}) {
    $result .= $pre_foil;
   
    if ($showanswer) {
       my $foiltext =  $Apache::response::foilgroup{$name . '.text'};
   
       # Bold the prior  response:
   
       if (defined($lastresponse->{$name})) {
    $result .= '<b>' . $foiltext . '</b>';
       } else {
    $result .= $foiltext;
       }
    } else {
       $result .= &html_radiobutton(
    $part, $Apache::inputtags::response['-1'], $name, $lastresponse, $temp
        );
    }
   
    $result .= $post_foil;
    $temp++;
       }
   
   
       $result .= $closing_html;
       return $result;
   
   }
   
   ##
   #  Generate LaTeX for surveys.
   #  
   #   @param $names - names of the foils to display.
   #   @param $showanswer - flag that is true to display answers.
   #   @param $lastresponse - Reference to a hash the indicates the last response.
   #   @param $direction    - Orientation of foils ('horiztonal' or otherwise).
   #   @param $venv         - LaTeX name for vertical env.
   #
   #   @return string
   #   @retval LaTeX rendering of the survey question.
   
   sub latex_survey {
       my ($names, $showanswer, $lastresponse, $direction, $venv) = @_;
   
       my $result;
       if ($showanswer) {
    $result .= "\\begin{$venv}";
    foreach my $name (@{$names}) {
       
       
       $result .= '\item \vskip -2mm ';
       
       if ( defined( $lastresponse->{$name} ) ) {
    $result .= '}';
       }
       $result .= $Apache::response::foilgroup{ $name . '.text' } . ' ';
    }
    $result .= "\\end{$venv}";
   
       } elsif ( $env{'form.pdfFormFields'} eq 'yes'
         && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
    $result .= &display_pdf_form($names, $direction, $venv);
       } else {
    if ($direction eq 'horizontal') {
       my @foil_texts = &get_foil_texts($names);
       $result .=  &Apache::caparesponse::make_horizontal_latex_bubbles(
       $names, \@foil_texts, '$\bigcirc$');
    } else {
       $result .= "\\begin{$venv}";
   
       my $temp = 0;
       my $i    = 0;
       foreach my $name (@{$names}) {
   
    $result .= '\item \vskip -2mm ';
   
    if ($env{'form.pdfFormFields'} ne 'yes'
       or $Apache::inputtags::status[-1] ne 'CAN_ANSWER' )
    {
       $result .=
    '$\bigcirc$'
    . $Apache::response::foilgroup{ $name . '.text' }
       . '\\\\';    #' stupid emacs
    }
   
    $i++;    
    $temp++;
   
    $result .= '\vskip 0 mm ';
       }
       $result .= "\\end{$venv}";
    }
       }
       return $result;
   }
   ##
   #  Figure out the LaTeX environment in which to wrap the LaTeX vertical output.
   #
   # @return string
   # @retval the environment name.  The LaTeX should be wrapped a 
   #    \begin{retval} \end{retval} pair.
   #
   sub latex_vertical_environment {
       if ($env{'form.pdfFormFields'} eq 'yes'
    && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
    return 'itemize';
       } else {
    return 'enumerate';
       }
   }
   
   ##
   # Figure out the key html fragments that depend on the rendering direction:
   #
   # @param $direction - 'horizontal' for horizontal direction.
   #
   # @return list
   # @retval (part_start, part_end, foil_start, foil_end)
   # Where:
   #   - part_start is the HTML to emit at the start of the part.
   #   - part_end   is the HTML to emit at the end of the part.
   #   - foil_start is the HTML to emit prior to each foil.
   #   - foil_end is the HTML to emit after each foil
   #
   sub html_direction_fragments {
       my $direction = shift;
       if ($direction eq 'horizontal') {
    return ('<table><tr>', '</tr></table>', '<td>', '</td>');
       } else {
    return ('', '', '<div class="LC_radiofoil">', '</div>');
       }
   }
   
   ##
   #
   #  Displays all the foils of a problem in a format suitable for
   #   surveys, surveys for credit, anonymous surveys and anonymous surveys for credit.
   #
   #  @param $direction - Display direction of the choices ('horiztonal' or not).
   #  @param $target    - Rendering target.
   #
   #  @return string
   #  @retval Text that renders for the selected target.
   # 
   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 $id   = $Apache::inputtags::response['-1'];
       my $part = $Apache::inputtags::part;
       
       my $showanswer = &Apache::response::show_answer();
       my $lastresponse = &get_last_survey_response($part, $showanswer, $id);
       my $used_names = &remove_unused(\@names);
   
   
       if ($target ne 'tex') {
    $result .= &display_survey_html(
       $used_names, $part, $showanswer, $lastresponse, $direction
    );
       } else {
   
    my $vertical_env = &latex_vertical_environment();
    $result .= &latex_survey(
       $used_names, $showanswer, $lastresponse, $direction, $vertical_env
    );
   
       }
       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) {
                   my $inc = 1;
                   if (($bottomcount > 0) && ($Apache::lonhomework::type ne 'exam')) {
                       $inc = 2;
                   }
                   $answer=int(&Math::Random::random_uniform() * ($#whichfalse+$inc))
                           + $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);
   }
   
   ## 
   #  Return a list  of foil texts given foil names.
   #  
   # @param $whichfoils - Reference to a list of foil names.
   #
   # @return array
   # @retval foil texts
   #
   sub get_foil_texts {
       my ($whichfoils) = @_;
       my @foil_texts;
   
       foreach my $name (@{$whichfoils}) {
    push(@foil_texts, $Apache::response::foilgroup{$name . '.text'});
       }
       return @foil_texts;
   }
   
   ##
   # Generate the HTML for a single html foil.
   # @param $part           - The part for which the response is being generated.
   # @param $fieldname      - The basename of the radiobutton field
   # @param $name           - The foilname.
   # @param $last_responses - Reference to a hash that holds the most recent
   #                          responses.
   # @param $value          - radiobutton value.
   # 
   # @return text
   # @retval The generated html.
   #
   sub html_radiobutton {
       my ($part, $fieldname, $name, $last_responses, $value) = @_;
   
       my $result='<label>';
       
       $result .= '<input type="radio" '
    . 'onchange="javascript:setSubmittedPart(' . "'$part');\" "
    . 'name="HWVAL_' . $fieldname . '" '
    . 'value="'.$value.'"';
   
       if (defined($last_responses->{$name})) {
    $result .= '  checked="checked" ';
       }
       $result .= ' />';
       $result .= $Apache::response::foilgroup{$name . '.text'};
       $result .= '</label>';
   
       return $result;
   
   }
   ##
   # Return a reference to the last response hash. This hash has exactly
   # one or zero entries.  The one entry is keyed by the foil 'name' of
   # the prior response
   #
   # @param $part - Number of the problem part.
   # 
   # @return reference to a hash.
   # @retval see above.
   #
   sub get_last_response {
       my ($part) = @_;
   
       my $id = $Apache::inputtags::response['-1'];
       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) {
           if ((($env{'form.grade_username'} eq '') && ($env{'form.grade_domain'} eq '')) ||
               (($env{'form.grade_username'} eq $env{'user.name'}) &&
                ($env{'form.grade_domain'} eq $env{'user.domain'}))) {
               $lastresponse =
                   $Apache::lonhomework::history{"resource.$part.$id.submission"};
           } else {
               unless (($Apache::lonhomework::history{"resource.$part.type"} eq 'anonsurvey') ||
                       ($Apache::lonhomework::history{"resource.$part.type"} eq 'anonsurveycred')) {
                   $lastresponse =
                       $Apache::lonhomework::history{"resource.$part.$id.submission"};
   
               }
           }
       }
   
       my %lastresponse = &Apache::lonnet::str2hash($lastresponse);
   
       return \%lastresponse;
   }
   
   ##
   # Display foils in html rendition.:
   #
   # @param $whichfoils - Set of foils to display.
   # @param $target     - Rendition target...there are several html targets.
   # @param $direction  - 'horizontal' if layout is horizontal.
   # @param $part       - Part of the problem that's being displayed.
   # @param $show_answer- True if answers should be shown.
   #
   # @return string
   # @retval generated html.
   #
   sub display_foils_html {
       my ($whichfoils, $target, $direction, $part, $show_answer) = @_;
       my $result;
   
   
       # if the answers get shown, we need to label each item as correct or
       # incorrect.
   
       my ($opening_html, $finalclose, $item_pretext, $item_posttext) = 
    &html_direction_fragments($direction);
   
       $result .= $opening_html;
   
   
       if ($show_answer) {
   
    foreach my $name (@{$whichfoils}) {
   
       # If the item gets further surrounded by tags, this 
       # holds the closures for those tages.
   
       my $item_closetag = '';
   
       $result .= $item_pretext;
   
       # Label each foil as correct or incorrect:
   
       if ($Apache::response::foilgroup{$name . '.value'} eq 'true') {
    $result .= &mt('Correct:') . '<b>';
    $item_closetag .= '</b>';
   
       } else {
    $result .= &mt('Incorrect');
       }
   
       # Web rendition encloses the 
       # item text in a label tag as well:
   
       if ($target eq 'web') {
    $result .= '<label>';
    $item_closetag = '</label>' . $item_closetag;
       }
       $result .= $Apache::response::foilgroup{$name . '.text'};
       $result .= $item_closetag;
       $result .= $item_posttext;
       $result .= "\n"; # make the html a bit more readable.
    }
   
   
       } else {
    my $lastresponse = &get_last_response($part);
   
    my $item_no = 0;
    foreach my $name (@{$whichfoils}) {
       $result .= $item_pretext;
       $result .= &html_radiobutton(
    $part, $Apache::inputtags::response[-1],
    $name, $lastresponse, $item_no
    );
       $result .= $item_posttext;
       $item_no++;
    }
   
       }
       $result .= $finalclose;
   
       return $result;
   }
   ##
   #  Display foils in exam mode for latex
   #
   # @param $whichfoils       - Reference to an array that contains the foil names to display
   # @param $bubbles_per_line - Number of bubbles on a line.
   # @param $direction        - Rendering direction 'horizontal' is what we're looking for.
   # @param $venv             - Name of LaTeX environment to use for vertical rendering.
   #
   # @return string
   # @return the latex rendering of the exam problem.
   #
   #
   sub display_latex_exam {
       my ($whichfoils, $bubbles_per_line, $direction, $venv) = @_;
       my $result;
       my $numlines;
       my $bubble_number = 0;
       my $line          = 0;
       my $i             = 0;
   
       
       if ($direction eq  'horizontal') {
   
    # Marshall the display text for each foil and turn things over to
    # Apache::response::make_horizontal_bubbles:
   
    my @foil_texts = &get_foil_texts($whichfoils);
    $result .= &Apache::caparesponse::make_horizontal_latex_bubbles(
       $whichfoils, \@foil_texts, '$\bigcirc$');
   
       } else {
   
    $result .= '\vskip 2mm \noindent';
   
    # This section puts out the prefix that tells the user
    # (if necessary) to only choose one bubble in the next n lines
    # for problems with more than one line worth of bubbles in the grid sheet:
   
    my $numitems = scalar( @{$whichfoils} );
    $numlines = int( $numitems / $bubbles_per_line );
    if ( ( $numitems % $bubbles_per_line ) != 0 ) {
       $numlines++;
    }
    if ( $numlines < 1 ) {
       $numlines = 1;
    }
    if ( $numlines > 1 ) {
       my $linetext;
       for ( my $i = 0 ; $i < $numlines ; $i++ ) {
    $linetext .= $Apache::lonxml::counter + $i . ', ';
       }
       $linetext =~ s/,\s$//;
       $result .=
    '\small {\textbf{'
    . $linetext . '}} '
    . ' {\footnotesize '
    . &mt( '(Bubble once in [_1] lines)', $numlines )
    . '} \hspace*{\fill} \\\\';
    }
    else {
       $result .= '\textbf{' . $Apache::lonxml::counter . '}.'.
                          '\hspace*{2 mm}';
    }
   
    # Now output the bubbles themselves:
   
    foreach my $name (@{$whichfoils}) {
       if ( $bubble_number >= $bubbles_per_line ) {
    $line++;
    $i             = 0;
    $bubble_number = 0;
       }
       my $identifier;
       if ( $numlines > 1 ) {
    $identifier = $Apache::lonxml::counter + $line;
       }
       my $preindent;
       if ($bubble_number > 0) {
                   my $offset = 5;
                   if ($Apache::lonxml::counter) {
                       if ($identifier) {
                           $offset += 2 * (length($identifier)-1);
                       } else {
                           $offset += 2 * (length($Apache::lonxml::counter)-1);
                       }
                   }
                   $preindent = '\hspace*{'.$offset.' mm}';
       }
       my $foiltext = $Apache::response::foilgroup{$name . '.text'};
       $foiltext =~ s/\\noindent//; # forgive me for I have sinned..
       $result .= '{\small \textbf{'
    . $identifier  .$preindent
    . $alphabet[$i]
    . '}}$\bigcirc$'
    . $foiltext
       . '\\\\';    #' stupid emacs -- it thinks it needs that apostrophe to close the quote
       
       $i++;
       $bubble_number++;
    }
   
       }
   
       return $result;
       
   }
   
   ##
   #  Display latex when exam mode is not on.
   #
   #  @param $whichfoils - The foils to display
   #  @param $direction  - Display direction ('horizontal' is what matters to us).
   #  @param $venv       - Vertical env. to use for vertical rendering.
   #  @param  $vend      - End the vertical environment being used.
   #
   #  @return string
   #  @retval - The LaTeX rendering of the resource.'
   #
   sub display_latex {
       my ($whichfoils, $direction, $venv) = @_;
       my $result;
   
       # how we render depends on the direction.
       # Vertical is some kind of list environment determined by vbegin/vend.
       # Horizontal is a table that is generated by 
       # Apache::caparesponse::make_horizontal_latex_bubbles with an empty string
       # for the actual bubble text.
   
       if ($direction eq 'horizontal') {
    my @foil_texts = &get_foil_texts($whichfoils);
    $result .= &Apache::caparesponse::make_horizontal_latex_bubbles(
       $whichfoils, \@foil_texts, '');
       } else {
    $result .= "\\begin{$venv}";
    foreach my $name (@{$whichfoils}) {
       $result .=  '\vspace*{-2 mm}\item '
    . $Apache::response::foilgroup{ $name . '.text' };
    }
   
    $result .= "\\end{$venv}";
       }
       return $result;
   }
   
   
   ##
   #  Render foils for a PDF form. This is a variant of tex rednering that provides
   #  sufficient markup that the final PDF is a form that can be filled in online,
   #  or offline.
   #
   # @param $whichfoils - References an array of foils to display in the order in which
   #                     they should be displayed.
   # @param $direction  - Rendering direction.  'horiztonal' means inputs are laid out
   #                      horizontally otherwise they are stacked vertically.
   # @param $venv       - Vertical environment in which to wrap the foils.
   #
   # @return string
   # @retval String containing the rendering of the resource.
   #
   # TODO: Take into account direction!!!
   #
   sub display_pdf_form {
       my ($whichfoils, $direction, $venv) = @_;
       my $temp = 0;
       my $result;
   
       $result .= "\\begin{$venv}";
       foreach my $name ( @{$whichfoils} ) {
   
    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";
   
    $temp++;
       }
       $result .= "\\end{$venv}";
   
       return $result;
   }
   
   
   ##
   # Display selected foils:  This is really just a dispatchter to appropriate renderers
   #  
   # @param $target   - Target (e.g. 'tex'...).
   # @param $answer   - True if answers should be shown.
   # @param $whichfoils - Array of foil selectors that indicate which foils shouild be
   #                      rendered, in rendering order.
   # @param $direction- Rendering direction ('horizontal' is the one we look for,
   #                    otherwise foils are rendered one per line vertically.
   # @param $bubbles_per_line - number of exam bubbles per line.
   #
   # @return string
   # @retval The rendered problem.
   
   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"};
   
       # Show answers html.
   
       if ( ( $target ne 'tex' )
           && &Apache::response::show_answer() )
       {
   
    $result = &display_foils_html(
       $whichfoils, $target, $direction, $part,  1);
   
    # other html
       }  elsif ($target ne 'tex') {
       $result = &display_foils_html($whichfoils, $target, $direction, $part,
     0, 0);
   
          # LaTeX rendering:
       } else {
   
   
           my $id            = $Apache::inputtags::response['-1'];
           my $part          = $Apache::inputtags::part;
    my $numlines;
   
    # Decide how to bracket the list of foils:
   
    my $vertical_env = &latex_vertical_environment();
   
    # Rendering for latex exams.
   
    if ( ( $Apache::lonhomework::type eq 'exam' ) )
    {
       $result .= &display_latex_exam(
    $whichfoils, $bubbles_per_line, $direction, $vertical_env);
   
       $result .= '\vskip 0mm ';
       
    } else {    
   
       # Different rendering for PDF form than for a
       # 'regular' answer direction is honored in both of those
       #
   
       if ( ($env{'form.pdfFormFields'} eq 'yes')
       && ($Apache::inputtags::status[-1] eq 'CAN_ANSWER'))
       {
    $result .= &display_pdf_form($whichfoils, $direction, $vertical_env);
       } else {
    $result .= &display_latex($whichfoils,  $direction, $vertical_env );
       }
       $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 {  sub start_foil {
   $Apache::lonxml::redirection++;      my ($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 {  sub end_foil {
   my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   if ($target eq 'web' || $target eq 'grade') {      my $text='';
     my $args ='';      if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') {
     if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }   $text=&Apache::lonxml::endredirection;
     my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);      }
     push @{ $Apache::response::foilgroup{'names'} }, $name;      if ($target eq 'web' || $target eq 'grade' || $target eq 'answer'
     my $value = &Apache::run::run("{$args;".'return $value}',$safeeval);   || $target eq 'tex' || $target eq 'analyze') {
     $Apache::response::foilgroup{"$name.value"} = $value;   my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
     $Apache::response::foilgroup{"$name.text"} = $Apache::lonxml::outputstack;   if ($value ne 'unused') {
   }      my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
         if ($name eq "") {
   $Apache::lonxml::redirection--;   &Apache::lonxml::warning(&mt('Foils without names exist. This can cause problems to malfunction.'));
   return '';   $name=$Apache::lonxml::curdepth;
       }
       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;  1;
 __END__  __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
     

Removed from v.1.3  
changed lines
  Added in v.1.162


FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>