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Diff for /loncom/homework/imageresponse.pm between versions 1.35 and 1.102

version 1.35, 2003/09/22 20:49:01 version 1.102, 2011/09/16 22:23:54
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   #
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # image click response style  # image click response style
 #  #
Line 25 Line 26
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 # July,August 2003 H. K. Ng  
 #  
 #FIXME LATER assumes multiple possible submissions but only one is possible   #FIXME LATER assumes multiple possible submissions but only one is possible 
 #currently  #currently
   
   
   =head1 NAME
   
   Apache::imageresponse
   
   =head1 SYNOPSIS
   
   Coordinates the response to clicking an image.
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   =head1 SUBROUTINES
   
   =over
   
   =item start_imageresponse()
   
   =item end_imageresponse()
   
   =item start_foilgroup()
   
   =item getfoilcounts()
   
   =item whichfoils()
   
   =item prep_image()
   
   =item draw_image()
   
   =item displayfoils()
   
   =item format_prior_response()
   
   =item display_answers()
   
   =item clean_up_image()
   
   =item gradefoils()
   
   =item stringify_submission()
   
   =item get_submission()
   
   =item end_foilgroup()
   
   =item start_conceptgroup()
   
   =item end_conceptgroup()
   
   =item insert_foil()
   
   =item start_foil()
   
   =item end_foil()
   
   =item start_text()
   
   =item end_text()
   
   =item start_image()
   
   =item end_image()
   
   =item start_rectangle()
   
   =item grade_rectangle()
   
   =item end_rectangle()
   
   =item start_polygon()
   
   =item grade_polygon()
   
   =item end_polygon()
   
   =back
   
   =cut
   
   
 package Apache::imageresponse;  package Apache::imageresponse;
 use Apache::randomlylabel;  
 use strict;  use strict;
 use Image::Magick;  use Image::Magick();
 use GD;  use Apache::randomlylabel();
   use Apache::londefdef();
   use Apache::Constants qw(:common :http);
   use Apache::lonlocal;
   use Apache::lonnet;
   use lib '/home/httpd/lib/perl/';
   use LONCAPA;
    
   
 BEGIN {  BEGIN {
   &Apache::lonxml::register('Apache::imageresponse',('imageresponse'));      &Apache::lonxml::register('Apache::imageresponse',('imageresponse'));
 }  }
   
 sub start_imageresponse {  sub start_imageresponse {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result;      my $result;
   #when in a radiobutton response use these      #when in a radiobutton response use these
   &Apache::lonxml::register('Apache::imageresponse',('foilgroup','foil','text','image','rectangle','conceptgroup'));      &Apache::lonxml::register('Apache::imageresponse',
   push (@Apache::lonxml::namespace,'imageresponse');        ('foilgroup','foil','text','image','rectangle',
   my $id = &Apache::response::start_response($parstack,$safeeval);         'polygon','conceptgroup'));
   if ($target eq 'meta') {      push (@Apache::lonxml::namespace,'imageresponse');
     $result=&Apache::response::meta_package_write('imageresponse');      my $id = &Apache::response::start_response($parstack,$safeeval);
   }      undef(%Apache::response::foilnames);
   return $result;      if ($target eq 'meta') {
    $result=&Apache::response::meta_package_write('imageresponse');
       } elsif ($target eq 'analyze') {
    my $part_id="$Apache::inputtags::part.$id";
           $Apache::lonhomework::analyze{"$part_id.type"} = 'imageresponse';
    push (@{ $Apache::lonhomework::analyze{"parts"} },$part_id);
    push (@{ $Apache::lonhomework::analyze{"$part_id.bubble_lines"} },
         1);
       } elsif ( $target eq 'edit' ) {
    $result .= &Apache::edit::tag_start($target,$token).
       &Apache::edit::text_arg('Max Number Of Shown Foils:',
       'max',$token,'4').
       &Apache::edit::end_row().
       &Apache::edit::start_spanning_row();
       } elsif ( $target eq 'modified' ) {
    my $constructtag=
       &Apache::edit::get_new_args($token,$parstack,$safeeval,'max');
    if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
       }
       return $result;
 }  }
   
 sub end_imageresponse {  sub end_imageresponse {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     &Apache::response::end_response;  
     pop @Apache::lonxml::namespace;      my $part_id     = $Apache::inputtags::part;
       my $response_id = $Apache::inputtags::response[-1]; 
   
       pop(@Apache::lonxml::namespace);
     &Apache::lonxml::deregister('Apache::imageresponse',('foilgroup','foil','text','image','rectangle','conceptgroup'));      &Apache::lonxml::deregister('Apache::imageresponse',('foilgroup','foil','text','image','rectangle','conceptgroup'));
   
     my $result;      my $result;
     if ($target eq 'edit') { $result=&Apache::edit::end_table(); }      if ($target eq 'edit') {
    $result=&Apache::edit::end_table();
       } elsif ($target eq 'tex'
        && $Apache::lonhomework::type eq 'exam') {
    $result=&Apache::inputtags::exam_score_line($target);
       }
   
       undef(%Apache::response::foilnames);
       
       if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || 
    $target eq 'tex' || $target eq 'analyze') {
    &Apache::lonxml::increment_counter(&Apache::response::repetition(), 
      "$part_id.$response_id");
    if ($target eq 'analyze') {
       &Apache::lonhomework::set_bubble_lines();
    }
   
       }
       &Apache::response::end_response();
     return $result;      return $result;
 }  }
   
 %Apache::response::foilgroup=();  %Apache::response::foilgroup=();
 sub start_foilgroup {  sub start_foilgroup {
   %Apache::response::foilgroup=();      my ($target) = @_;
   $Apache::imageresponse::conceptgroup=0;      %Apache::response::foilgroup=();
   &Apache::response::setrandomnumber();      $Apache::imageresponse::conceptgroup=0;
   return '';      &Apache::response::pushrandomnumber(undef,$target);
       return '';
 }  }
   
 sub getfoilcounts {  sub getfoilcounts {
   my ($parstack,$safeeval)=@_;      my ($parstack,$safeeval)=@_;
   
   my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');      my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
   # +1 since instructors will count from 1      # +1 since instructors will count from 1
   my $count = $#{ $Apache::response::foilgroup{'names'} }+1;      my $count = $#{ $Apache::response::foilgroup{'names'} }+1;
   if (&Apache::response::showallfoils()) { $max=$count; }      if (&Apache::response::showallfoils()) { $max=$count; }
   return ($count,$max);      return ($count,$max);
 }  }
   
 sub whichfoils {  sub whichfoils {
   my ($max)=@_;      my ($max)=@_;
   if (!defined(@{ $Apache::response::foilgroup{'names'} })) { return; }      return if (!defined(@{ $Apache::response::foilgroup{'names'} }));
   my @names = @{ $Apache::response::foilgroup{'names'} };      my @names = @{ $Apache::response::foilgroup{'names'} };
   my @whichopt =();      my @whichopt;
   while ((($#whichopt+1) < $max) && ($#names > -1)) {      while ((($#whichopt+1) < $max) && ($#names > -1)) {
     &Apache::lonxml::debug("Have $#whichopt max is $max");   &Apache::lonxml::debug("Have $#whichopt max is $max");
     my $aopt;   my $aopt;
     if (&Apache::response::showallfoils()) {   if (&Apache::response::showallfoils()) {
       $aopt=0;      $aopt=0;
     } else {   } else {
       $aopt=int(&Math::Random::random_uniform() * ($#names+1));      $aopt=int(&Math::Random::random_uniform() * ($#names+1));
    }
    &Apache::lonxml::debug("From $#names elms, picking $aopt");
    $aopt=splice(@names,$aopt,1);
    &Apache::lonxml::debug("Picked $aopt");
    push(@whichopt,$aopt);
     }      }
     &Apache::lonxml::debug("From $#names elms, picking $aopt");      return @whichopt;
     $aopt=splice(@names,$aopt,1);  }
     &Apache::lonxml::debug("Picked $aopt");  
     push (@whichopt,$aopt);  sub prep_image {
   }      my ($image,$mode,$name)=@_;
   return @whichopt;  
       my ($x,$y)= &get_submission($name);
       &Apache::lonxml::debug("for $name drawing click at $x and $y");
       &draw_image($mode,$image,$x,$y,$Apache::response::foilgroup{"$name.area"});
   }
   
   sub draw_image {
       my ($mode,$image,$x,$y,$areas) = @_;
   
       my $id=&Apache::loncommon::get_cgi_id();
   
       my (%x,$i);
       $x{"cgi.$id.BGIMG"}=&escape($image);
   
       #draws 2 xs on the image at the clicked location
       #one in white and then one in red on top of the one in white
   
       if (defined($x)    && $x =~/\S/ 
    && defined($y) && $y =~/\S/ 
    && ($mode eq 'submission' || !&Apache::response::show_answer())
    && $mode ne 'answeronly') {
    my $length = 6;
    my $width = 1;
    my $extrawidth = 2;
    my $xmin=($x-$length);
    my $xmax=($x+$length); 
    my $ymin=($y-$length);
    my $ymax=($y+$length);
   
    $x{"cgi.$id.OBJTYPE"}.='LINE:';
    $i=$x{"cgi.$id.OBJCOUNT"}++;
    $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymin),($xmax),($ymax),
         "FFFFFF",($width+$extrawidth)));
    $x{"cgi.$id.OBJTYPE"}.='LINE:';
    $i=$x{"cgi.$id.OBJCOUNT"}++;
    $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymax),($xmax),($ymin),
         "FFFFFF",($width+$extrawidth)));
    $x{"cgi.$id.OBJTYPE"}.='LINE:';
    $i=$x{"cgi.$id.OBJCOUNT"}++;
    $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymin),($xmax),($ymax),
         "FF0000",($width)));
    $x{"cgi.$id.OBJTYPE"}.='LINE:';
    $i=$x{"cgi.$id.OBJCOUNT"}++;
    $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymax),($xmax),($ymin),
         "FF0000",($width)));
       }
       if ($mode eq 'answer' || $mode eq 'answeronly') {
    my $width = 1;
    my $extrawidth = 2;
    foreach my $area (@{ $areas }) {
       if ($area=~/^rectangle:/) {
    $x{"cgi.$id.OBJTYPE"}.='RECTANGLE:';
    $i=$x{"cgi.$id.OBJCOUNT"}++;
    my ($x1,$y1,$x2,$y2)=
       ($area=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/);
    $x{"cgi.$id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,"FFFFFF",
         ($width+$extrawidth)));
    $x{"cgi.$id.OBJTYPE"}.='RECTANGLE:';
    $i=$x{"cgi.$id.OBJCOUNT"}++;
    $x{"cgi.$id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,"00FF00",$width));
       } elsif ($area=~/^polygon:(.*)/) {
    $x{"cgi.$id.OBJTYPE"}.='POLYGON:';
    $i=$x{"cgi.$id.OBJCOUNT"}++;
    $x{"cgi.$id.OBJ$i"}=join(':',("FFFFFF",($width+$extrawidth)));
    $x{"cgi.$id.OBJEXTRA$i"}=$1;
    $x{"cgi.$id.OBJTYPE"}.='POLYGON:';
    $i=$x{"cgi.$id.OBJCOUNT"}++;
    $x{"cgi.$id.OBJ$i"}=join(':',("00FF00",$width));
    $x{"cgi.$id.OBJEXTRA$i"}=$1;
       }
    }
       }
       &Apache::lonnet::appenv(\%x);
       return $id;
 }  }
   
 sub displayfoils {  sub displayfoils {
   my ($target,@whichopt) = @_;      my ($target,@whichopt) = @_;
   my $result ='';      my $result ='';
   my $name;      my $temp=1;
   my $temp=1;      my @images;
   foreach $name (@whichopt) {      foreach my $name (@whichopt) {
     $result.=$Apache::response::foilgroup{"$name.text"};   $result.=$Apache::response::foilgroup{"$name.text"};
     &Apache::lonxml::debug("Text is $result");   &Apache::lonxml::debug("Text is $result");
     if ($target eq 'tex') {$result.="\\vskip 0 mm \n";} else {$result.="<br />\n";}   if ($target eq 'tex') {$result.="\\vskip 0 mm \n";} else {$result.="<br />\n";}
     my $image=$Apache::response::foilgroup{"$name.image"};   my $image=$Apache::response::foilgroup{"$name.image"};
     &Apache::lonxml::debug("image is $image");   &Apache::lonxml::debug("image is $image");
     if ( &Apache::response::show_answer() ) {   if ( ($target eq 'web' || $target eq 'answer') 
       if ($target eq 'tex') {       && $image !~ /^https?\:/ ) {
  $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";      $image=&clean_up_image($image);
       } else {   }
         $result.="<img src=\"$image\"/> <br />\n";   push(@images,$image);
       }   &Apache::lonxml::debug("image is $image");
    if ( &Apache::response::show_answer() ) {
       if ($target eq 'tex') {
    $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";
       } else {
    my $token=&prep_image($image,'answer',$name);
    $result.="<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n";
       }
    } else {
       if ($target eq 'tex') {
    $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";
       } else {
    my $respid=$Apache::inputtags::response['-1'];
    my $token=&prep_image($image,'submission',$name);
    my $input_id = "HWVAL_$respid:$temp";
    my $id = $env{'form.request.prefix'}.$input_id;
    $result.='<img onclick="image_response_click(\''.$id.'\',event);"
                          src="/adm/randomlabel.png?token='.$token.'" 
                                  id="'.$id.'_imageresponse"
                                   />'.
          '<br />'.
          '<input type="hidden" name="'.$input_id.'_token" value="'.$token.'" />'.
          '<input type="hidden" name="'.$input_id.'" value="'.
          join(':',&get_submission($name)).'" />';
       }
    }
    $temp++;
       }
       if ($target eq 'web') {
           &get_prior_options(\@images,\@whichopt);
       }
       return $result;
   }
   
   sub get_prior_options {
       my ($currimages,$curropt) = @_;
       return unless((ref($curropt) eq 'ARRAY') && 
                     (ref($currimages) eq 'ARRAY'));
       my $part = $Apache::inputtags::part;
       my $respid   = $Apache::inputtags::response[-1];
       foreach my $i (1..$Apache::lonhomework::history{'version'}) {
           my $partprefix = "$i:resource.$part";
           my $sub_key = "$partprefix.$respid.submission";
           next if (!exists($Apache::lonhomework::history{$sub_key}));
           my $type_key = "$partprefix.type";
           my @whichopt = ();
           my @images = ();
           if ($Apache::lonhomework::history{$type_key} eq 'randomizetry') {
               my $order_key = "$partprefix.$respid.foilorder";
               @whichopt = &Apache::lonnet::str2array($Apache::lonhomework::history{$order_key});
               if (@whichopt > 0) {
                   foreach my $name (@whichopt) {
                       my $image=$Apache::response::foilgroup{"$name.image"};
                       if ($image !~ /^https?\:/ ) {
                           $image=&clean_up_image($image);
                       }
                       push(@images,$image);
                   }
               }
           } else {
               @whichopt = @{$curropt};
               @images = @{$currimages};
           }
           my $submission = $Apache::lonhomework::history{$sub_key};
           my $output =  &format_prior_response('grade',$submission,
                                                [\@images,\@whichopt]);
           if (defined($output)) {
               $Apache::inputtags::submission_display{$sub_key} = $output;
           }
       }
   }
   
   sub format_prior_response {
       my ($mode,$answer,$other_data) = @_;
       
       my $result;
   
       # make a copy of the data in the refs
       my @images = @{ $other_data->[0] };
       my @foils = @{ $other_data->[1] };
       foreach my $name (@foils) {
    my $image = pop(@images);
    my ($x,$y) = &get_submission($name,$answer);
    my $token = &draw_image('submission',$image,$x,$y);
    $result .=
       '<img class="LC_prior_image"
                     src="/adm/randomlabel.png?token='.$token.'" /><br />';
       }
       return $result;
   }
   
   sub display_answers {
       my ($target,$whichopt)=@_;
   
       my $result=&Apache::response::answer_header('imageresponse');
       foreach my $name (@$whichopt) {
    my $image=$Apache::response::foilgroup{"$name.image"};
    &Apache::lonxml::debug("image is $image");
    if ( ($target eq 'web' || $target eq 'answer')
        && $image !~ /^https?\:/ ) {
       $image = &clean_up_image($image);
    } 
    my $token=&prep_image($image,'answeronly',$name);
   
    $result.=&Apache::response::answer_part('imageresponse',"<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n");
       }
       $result.=&Apache::response::answer_footer('imageresponse');
       return $result;
   }
   
   sub clean_up_image {
       my ($image)=@_;
       if ($image =~ /\s*<img\s*/) {
    ($image) = ($image =~ /src\s*=\s*[\"\']([^\"\']+)[\"\']/i);
    if ($image !~ /^https?\:/) {
       $image=&Apache::lonnet::hreflocation('',$image);
    }
    if (!$image) {
       $image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif';
    }
     } else {      } else {
       if ($target eq 'tex') {   $image=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$image);
  $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";   &Apache::lonxml::debug("repcopying: $image");
       } else {   if (&Apache::lonnet::repcopy($image) ne 'ok') {
         $result.="<input type=\"image\" name=\"HWVAL_$Apache::inputtags::response['-1']:$temp\" src=\"$image\"/> <br />\n";      $image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif';
       }   }
     }      }
     $temp++;      return $image;
   }  
   return $result;  
 }  }
   
 sub gradefoils {  sub gradefoils {
   my (@whichopt) = @_;      my (@whichopt) = @_;
   my $x;  
   my $y;      my $partid = $Apache::inputtags::part;
   my $result;      my $id     = $Apache::inputtags::response['-1'];
   my $id=$Apache::inputtags::response['-1'];  
   my $temp=1;      if ($Apache::lonhomework::type eq 'exam') {
   foreach my $name (@whichopt) {   &Apache::response::scored_response($partid,$id);
     $x=$ENV{"form.HWVAL_$id:$temp.x"};   return;
     $y=$ENV{"form.HWVAL_$id:$temp.y"};      }
     &Apache::lonxml::debug("Got a x of $x and a y of $y for $name");      
     if (defined($x) && defined($y) &&      my @results;
  defined(@{ $Apache::response::foilgroup{"$name.area"} })) {      my $temp=1;
       my @areas = @{ $Apache::response::foilgroup{"$name.area"} };      my %response;
       my $grade="INCORRECT";      foreach my $name (@whichopt) {
       foreach my $area (@areas) {   my ($x,$y) = split(':',$env{"form.HWVAL_$id:$temp"});
  &Apache::lonxml::debug("Area is $area for $name");   $response{$name} = $env{"form.HWVAL_$id:$temp"};
  $area =~ m/([a-z]*):/;   &Apache::lonxml::debug("Got a x of $x and a y of $y for $name");
  &Apache::lonxml::debug("Area of type $1");   if (defined($x) && defined($y) &&
  if ($1 eq 'rectangle') {      defined(@{ $Apache::response::foilgroup{"$name.area"} })) {
   $grade=&grade_rectangle($area,$x,$y);      my @areas = @{ $Apache::response::foilgroup{"$name.area"} };
       my $grade="INCORRECT";
       foreach my $area (@areas) {
    &Apache::lonxml::debug("Area is $area for $name");
    $area =~ m/([a-z]*):/;
    &Apache::lonxml::debug("Area of type $1");
    if ($1 eq 'rectangle') {
       $grade=&grade_rectangle($area,$x,$y);
    } elsif ($1 eq 'polygon') {
       $grade=&grade_polygon($area,$x,$y);
    } else {
       &Apache::lonxml::error(&mt('Unknown area style [_1]',$area));
    }
    &Apache::lonxml::debug("Area said $grade");
    if ($grade eq 'APPROX_ANS') { last; }
       }
       &Apache::lonxml::debug("Foil was $grade");
       push(@results, $grade)
  } else {   } else {
   &Apache::lonxml::error("Unknown area style $area");      push(@results, 'MISSING_ANSWER')
  }   }
  &Apache::lonxml::debug("Area said $grade");   $temp++;
  if ($grade eq 'APPROX_ANS') { last; }      }
       }      if ($Apache::lonhomework::type eq 'randomizetry') {
       &Apache::lonxml::debug("Foil was $grade");          $Apache::lonhomework::results{"resource.$partid.$id.foilorder"} = &Apache::lonnet::array2str(@whichopt);
       if ($grade eq 'INCORRECT') { $result= 'INCORRECT'; }      }
       if (($grade eq 'APPROX_ANS') && ($result ne 'APPROX_ANS')) { $result=$grade; }      my ($result) = &Apache::inputtags::finalizeawards(\@results,[]);
       &Apache::lonxml::debug("Question is $result");      &Apache::lonxml::debug("Question is $result");
       $temp++;  
     }      my $part=$Apache::inputtags::part;
   }      my %previous=
   $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}="$x:$y";   &Apache::response::check_for_previous(&stringify_submission(\%response),
   $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}=$result;        $part,$id);
   return '';      if ($result) { 
    if ($Apache::lonhomework::type eq 'survey') { 
               $result='SUBMITTED';
           } elsif ($Apache::lonhomework::type eq 'surveycred') { 
               $result='SUBMITTED_CREDIT'; 
           } elsif ($Apache::lonhomework::type eq 'anonsurvey') { 
               $result='ANONYMOUS'; 
           } elsif ($Apache::lonhomework::type eq 'anonsurveycred') { 
               $result='ANONYMOUS_CREDIT'; 
           }
       }
   
       &Apache::response::handle_previous(\%previous,$result);
       $Apache::lonhomework::results{"resource.$part.$id.submission"}=
    &stringify_submission(\%response);
       $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$result;
       return;
   }
   
   sub stringify_submission {
       my ($response) = @_;
       return &Apache::lonnet::hash2str(%{ $response });
   }
   
   sub get_submission {
       my ($name,$string) = @_;
   
       if (!defined($string)) {
    my $part=$Apache::inputtags::part;
    my $respid=$Apache::inputtags::response['-1'];
       $string = 
       $Apache::lonhomework::history{"resource.$part.$respid.submission"};
       }
   
       if ($string !~ /=/) {
    return split(':',$string);
       } else {
    my %response = &Apache::lonnet::str2hash($string);
    return split(':',$response{$name});
       }
 }  }
   
 sub end_foilgroup {  sub end_foilgroup {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result='';      my $result='';
   my @whichopt;      my @whichopt;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {  
     my ($count,$max) = &getfoilcounts($parstack,$safeeval);      if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
     if ($count>$max) { $count=$max }   $target eq 'analyze' || $target eq 'answer') {
     &Apache::lonxml::debug("Count is $count from $max");  
     @whichopt = &whichfoils($max);   my ($count,$max) = &getfoilcounts($parstack,$safeeval);
     if ($target eq 'web' || $target eq 'tex') {   if ($count>$max) { $count=$max }
  $result=&displayfoils($target,@whichopt);   &Apache::lonxml::debug("Count is $count from $max");
     } elsif ($target eq 'grade') {  
  if ( defined $ENV{'form.submitted'}) { &gradefoils(@whichopt); }   @whichopt = &whichfoils($max);
     }   
   } elsif ($target eq 'edit') {   if ($target eq 'web' || $target eq 'tex') {
       $result=&Apache::edit::end_table();      $result=&displayfoils($target,@whichopt);
   }              if ($Apache::lonhomework::type eq 'randomizetry') {
   return $result;                  if ($target eq 'web') {
                       &get_prior_options($target,@whichopt);
                   }
               }
       $Apache::lonxml::post_evaluate=0;
    } elsif ($target eq 'grade') {
       if ( defined $env{'form.submitted'}) { &gradefoils(@whichopt); }
    } elsif ( $target eq 'analyze') {
       &Apache::response::analyze_store_foilgroup(\@whichopt,
         ['text','image','area']);
    } elsif ($target eq 'answer'
    && $env{'form.answer_output_mode'} ne 'tex') {
       $result=&display_answers($target,\@whichopt);
    }
   
       } elsif ($target eq 'edit') {
    $result=&Apache::edit::end_table();
       }
       &Apache::response::poprandomnumber();
       return $result;
 }  }
   
 sub start_conceptgroup {  sub start_conceptgroup {
   $Apache::imageresponse::conceptgroup=1;      $Apache::imageresponse::conceptgroup=1;
   %Apache::response::conceptgroup=();      %Apache::response::conceptgroup=();
   return '';      return '';
 }  }
   
 sub end_conceptgroup {  sub end_conceptgroup {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   $Apache::imageresponse::conceptgroup=0;      $Apache::imageresponse::conceptgroup=0;
   my $result;      my $result;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {      if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
     if (defined(@{ $Apache::response::conceptgroup{'names'} })) {   $target eq 'analyze') {
       my @names = @{ $Apache::response::conceptgroup{'names'} };   &Apache::response::pick_foil_for_concept($target,
       my $pick=int(&Math::Random::random_uniform() * ($#names+1));   ['area','text','image'],
       my $name=$names[$pick];   \%Apache::hint::image,
       if (defined(@{ $Apache::response::conceptgroup{"$name.area"} })) {   $parstack,$safeeval);
  push @{ $Apache::response::foilgroup{'names'} }, $name;      } elsif ($target eq 'edit') {
  $Apache::response::foilgroup{"$name.text"} = $Apache::response::conceptgroup{"$name.text"};   $result=&Apache::edit::end_table();
  $Apache::response::foilgroup{"$name.image"} = $Apache::response::conceptgroup{"$name.image"};      }
  push(@{ $Apache::response::foilgroup{"$name.area"} }, @{ $Apache::response::conceptgroup{"$name.area"} });      return $result;
  my $concept = &Apache::lonxml::get_param('concept',$parstack,$safeeval);  
  $Apache::response::foilgroup{"$name.concept"} = $concept;  
  &Apache::lonxml::debug("Selecting $name in $concept");  
       }  
     }  
   } elsif ($target eq 'edit') {  
       $result=&Apache::edit::end_table();  
   }  
   return $result;  
 }  }
   
 sub insert_foil {  sub insert_foil {
Line 233  sub insert_foil { Line 622  sub insert_foil {
   
 $Apache::imageresponse::curname='';  $Apache::imageresponse::curname='';
 sub start_foil {  sub start_foil {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {      my $result;
     my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);      if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
     if ($name eq '') { $name=$Apache::lonxml::curdepth; }   $target eq 'analyze' || $target eq 'answer') {
     if ( $Apache::imageresponse::conceptgroup   my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
  && !&Apache::response::showallfoils()) {   if ($name eq "") {
       push(@{ $Apache::response::conceptgroup{'names'} }, $name);      &Apache::lonxml::warning(&mt('Foils without names exist. This can cause problems to malfunction.'));
     } else {      $name=$Apache::lonxml::curdepth;
       push(@{ $Apache::response::foilgroup{'names'} }, $name);   }
     }   if (defined($Apache::response::foilnames{$name})) {
     $Apache::imageresponse::curname=$name;      &Apache::lonxml::error(&mt("Foil name [_1] appears more than once. Foil names need to be unique."
   }                                        ,'<b><tt>'.$name.'</tt></b>'));
   return '';   }
    $Apache::response::foilnames{$name}++;
    if ( $Apache::imageresponse::conceptgroup
        && !&Apache::response::showallfoils()
        ) {
       push(@{ $Apache::response::conceptgroup{'names'} }, $name);
    } else {
       push(@{ $Apache::response::foilgroup{'names'} }, $name);
    }
    $Apache::imageresponse::curname=$name;
       } elsif ($target eq 'edit') {
    $result  = &Apache::edit::tag_start($target,$token);
    $result .= &Apache::edit::text_arg('Name:','name',$token);
    $result .= &Apache::edit::end_row().
       &Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'name');
    if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
       } 
       return $result;;
 }  }
   
 sub end_foil {  sub end_foil {
Line 258  sub end_foil { Line 667  sub end_foil {
 }  }
   
 sub start_text {  sub start_text {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result='';      my $result='';
   if ($target eq 'web' || $target eq 'tex') {       if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
      &Apache::lonxml::startredirection;    || $target eq 'answer') { 
   } elsif ($target eq 'edit') {   &Apache::lonxml::startredirection; 
     my $descr=&Apache::lonxml::get_all_text('/text',$parser);      } elsif ($target eq 'edit') {
     $result=&Apache::edit::tag_start($target,$token,'Task Description').   my $descr=&Apache::lonxml::get_all_text('/text',$parser,$style);
  &Apache::edit::editfield($token->[1],$descr,'Text',60,2).   $result=&Apache::edit::tag_start($target,$token,'Task Description').
         &Apache::edit::end_row();      &Apache::edit::editfield($token->[1],$descr,'Text',60,2).
   } elsif ($target eq "modified") {      &Apache::edit::end_row();
     my $descr=&Apache::lonxml::get_all_text('/text',$parser);      } elsif ($target eq "modified") {
     $result=$token->[4].&Apache::edit::modifiedfield($token);   $result=$token->[4].&Apache::edit::modifiedfield('/text',$parser);
     &Apache::lonxml::debug($result);      }
   }      return $result;
   return $result;  
 }  }
   
 sub end_text {  sub end_text {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result;      my $result;
   if ($target eq 'web' || $target eq 'tex') {      if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
     my $name = $Apache::imageresponse::curname;   || $target eq 'answer') {
     if ( $Apache::imageresponse::conceptgroup   my $name = $Apache::imageresponse::curname;
        && !&Apache::response::showallfoils() ) {   if ( $Apache::imageresponse::conceptgroup
       $Apache::response::conceptgroup{"$name.text"} = &Apache::lonxml::endredirection;       && !&Apache::response::showallfoils()
     } else {       ) {
       $Apache::response::foilgroup{"$name.text"} = &Apache::lonxml::endredirection;      $Apache::response::conceptgroup{"$name.text"} = &Apache::lonxml::endredirection;
    } else {
       $Apache::response::foilgroup{"$name.text"} = &Apache::lonxml::endredirection;
    }
       } elsif ($target eq 'edit') {
    $result=&Apache::edit::end_table();
     }      }
   } elsif ($target eq 'edit') {      return $result;
       $result=&Apache::edit::end_table();  
   }  
   return $result;  
 }  }
   
 sub start_image {  sub start_image {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result='';      my $result='';
   if ($target eq 'web' || $target eq 'tex') {       my $only = join(',',&Apache::loncommon::filecategorytypes('Pictures'));
       &Apache::lonxml::startredirection;       if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
   } elsif ($target eq 'edit') {   || $target eq 'answer') { 
     my $bgimg=&Apache::lonxml::get_all_text('/image',$parser);   &Apache::lonxml::startredirection; 
     $Apache::edit::bgimgsrc=$bgimg;      } elsif ($target eq 'edit') {
     $Apache::edit::bgimgsrcdepth=$Apache::lonxml::curdepth;   my $bgimg=&Apache::lonxml::get_all_text('/image',$parser,$style);
    $Apache::edit::bgimgsrc=$bgimg;
     $result=&Apache::edit::tag_start($target,$token,'Clickable Image').   $Apache::edit::bgimgsrcdepth=$Apache::lonxml::curdepth;
  &Apache::edit::editline($token->[1],$bgimg,'Image Source File',40);  
     $result.=&Apache::edit::browse(undef,'textnode').' ';   $result=&Apache::edit::tag_start($target,$token,'Clickable Image').
     $result.=&Apache::edit::search(undef,'textnode').      &Apache::edit::editline($token->[1],$bgimg,'Image Source File',40);
         &Apache::edit::end_row();   $result.=&Apache::edit::browse(undef,'textnode',undef,$only).' ';
   } elsif ($target eq "modified") {   $result.=&Apache::edit::search(undef,'textnode').
     my $bgimg=&Apache::lonxml::get_all_text('/image',$parser);      &Apache::edit::end_row();
     $result=$token->[4].&Apache::edit::modifiedfield($token);      } elsif ($target eq "modified") {
     &Apache::lonxml::debug($result);   $result=$token->[4].&Apache::edit::modifiedfield('/image',$parser);
   }      }
   return $result;      return $result;
 }  }
   
 sub end_image {  sub end_image {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result;      my $result;
   my $name = $Apache::imageresponse::curname;      my $name = $Apache::imageresponse::curname;
   if ($target eq 'web') {      if ($target eq 'web' || $target eq 'answer') {
     my $image = &Apache::lonxml::endredirection;   my $image = &Apache::lonxml::endredirection();
     &Apache::lonxml::debug("original image is $image");   &Apache::lonxml::debug("original image is $image");
     my $id=$Apache::inputtags::response['-1'];   if ( $Apache::imageresponse::conceptgroup
     my $temp=1;       && !&Apache::response::showallfoils()
     my $x=$ENV{"form.HWVAL_$id:$temp.x"};       ) {
     my $y=$ENV{"form.HWVAL_$id:$temp.y"};      $Apache::response::conceptgroup{"$name.image"} = $image;
     if (defined ($x) && defined ($y)) {   } else {
  &Apache::lonxml::debug("x and y defined as $x,$y");      $Apache::response::foilgroup{"$name.image"} = $image;
  my $currentImage = &Apache::randomlylabel::get_image('/home/httpd/html'.$image,1);  
  if (! defined($currentImage)) {  
     &Apache::lonnet::logthis('Unable to create image object for '.$image);  
     return '';  
  }  
  my $red;  
  if (!($red = $currentImage->colorResolve(255,0,0))) {  
     $red = $currentImage->colorClosestHWB(255,0,0);  
  }   }
  my $length = 6;      } elsif ($target eq 'analyze') {
  $currentImage->line($x-$length,$y-$length,$x+$length,$y+$length,$red);   my $image = &Apache::lonxml::endredirection();
  $currentImage->line($x-$length,$y+$length,$x+$length,$y-$length,$red);   if ( $Apache::imageresponse::conceptgroup
        && !&Apache::response::showallfoils()
  my ($nameWOext) = ($image =~ /^.*\/(.*)\..*$/);       ) {
  &Apache::lonxml::debug("graph name $nameWOext");      $Apache::response::conceptgroup{"$name.image"} = $image;
  my $webImageName = "/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_".   } else {
     $nameWOext.'.png'; #needs to be more random or specific      $Apache::response::foilgroup{"$name.image"} = $image;
  my $newImageName = '/home/httpd'.$webImageName;  
   
  my $imgfh = Apache::File->new('>'.$newImageName);   
  print $imgfh $currentImage->png;  
  $image = $webImageName;  
     }  
     &Apache::lonxml::debug("out image is $image");  
     if ( $Apache::imageresponse::conceptgroup  
  && !&Apache::response::showallfoils()) {  
       $Apache::response::conceptgroup{"$name.image"} = $image;  
     } else {  
       $Apache::response::foilgroup{"$name.image"} = $image;  
     }  
   } elsif ($target eq 'edit') {  
       $result=&Apache::edit::end_table();  
   } elsif ($target eq 'tex') {  
     my $src = &Apache::lonxml::endredirection;  
     $src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);  
     my $width_param = '';  
     my $height_param = '';  
     my $scaling = .3;  
     my $image = Image::Magick->new;  
     my $current_figure = $image->Read($src);  
     $width_param = $image->Get('width') * $scaling;;  
     $height_param = $image->Get('height') * $scaling;;  
     undef $image;  
     my $epssrc = $src;  
     $epssrc =~ s/(\.gif|\.jpg)$/\.eps/i;  
     if (not -e $epssrc) {  
  my $localfile = $epssrc;  
  $localfile =~ s/.*(\/res)/$1/;  
  my $file;  
  my $path;  
  if ($localfile =~ m!(.*)/([^/]*)$!) {  
     $file = $2;  
     $path = $1.'/';   
  }  
  my $signal_eps = 0;  
  my @content_directory = &Apache::lonnet::dirlist($path);  
  for (my $iy=0;$iy<=$#content_directory;$iy++) {  
     my @tempo_array = split(/&/,$content_directory[$iy]);  
     $content_directory[$iy] = $tempo_array[0];  
     if ($file eq $tempo_array[0]) {  
  $signal_eps = 1;  
  last;  
     }  
  }   }
  if ($signal_eps) {      } elsif ($target eq 'edit') {
     my $eps_file = &Apache::lonnet::getfile($localfile);   $result=&Apache::edit::end_table();
       } elsif ($target eq 'tex') {
    my $src = &Apache::lonxml::endredirection();
   
    #  There may be all sorts of whitespace on fore and aft:
   
    $src =~ s/\s+$//s;
    $src =~ s/^\s+//s;
   
    #
    #  Gnuplot e.g. just generates the latex to put inplace.
    #
    my $graphinclude;
    if ($src =~ /^%DYNAMICIMAGE/) {
       # This is needed because the newline is not always passed -> tex.
       # At present we don't care about the sizing info.
   
       my ($commentline, $restofstuff) = split(/\n/, $src);
       $graphinclude = $src;
       $graphinclude =~ s/^$commentline//;
    } elsif (!($src =~ /\\/)) {
       my ($path,$file) = &Apache::londefdef::get_eps_image($src);
       my ($height_param,$width_param)=
    &Apache::londefdef::image_size($src,0.3,$parstack,$safeeval);
       $graphinclude = '\graphicspath{{'.$path.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'}';
  } else {   } else {
     $localfile = $src;      $graphinclude = $src;   # Already fully formed.
     $localfile =~ s/.*(\/res)/$1/;  
     my $as = &Apache::lonnet::getfile($src);        
  }  
     }  
     my $file;  
     my $path;  
     if ($src =~ m!(.*)/([^/]*)$!) {  
  $file = $2;  
  $path = $1.'/';   
     }  
     my $newsrc = $src;  
     $newsrc =~ s/(\.gif|\.jpg|\.jpeg)$/\.eps/i;  
     $file=~s/(\.gif|\.jpg|\.jpeg)$/\.eps/i;  
     #do we have any specified size of the picture?  
     my $TeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval);   
     my $TeXheight = &Apache::lonxml::get_param('TeXheight',$parstack,$safeeval);   
     my $width = &Apache::lonxml::get_param('width',$parstack,$safeeval);  
     if ($TeXwidth ne '') {   
  $width_param = $TeXwidth;   
     } elsif ($TeXheight ne '') {   
  $width_param = $TeXheight/$height_param*$width_param;  
     } elsif ($width ne '') {  
  $width_param = $width*$scaling;        
     }  
     #where can we find the picture?  
     if (-e $newsrc) {  
  if ($path) {  
   $Apache::response::foilgroup{"$name.image"} ='\vskip 0 mm \noindent\graphicspath{{'.$path.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';  
  }   }
     } else {   $Apache::response::foilgroup{"$name.image"} ='\vskip 0 mm \noindent '.$graphinclude;
  my $temp_file;      } 
  my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.dat";      return $result;
  $temp_file = Apache::File->new('>>'.$filename);   
  print $temp_file "$src\n";  
 $Apache::response::foilgroup{"$name.image"} ='\vskip 0 mm \graphicspath{{/home/httpd/prtspool/}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';  
     }  
   }   
   return $result;  
 }  }
   
 sub start_rectangle {  sub start_rectangle {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result='';      my $result='';
   if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {       if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
      &Apache::lonxml::startredirection;    $target eq 'analyze' || $target eq 'answer') { 
   } elsif ($target eq 'edit') {   &Apache::lonxml::startredirection; 
     my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser);      } elsif ($target eq 'edit') {
     $result=&Apache::edit::tag_start($target,$token,'Rectangle').   my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser,$style);
  &Apache::edit::editline($token->[1],$coords,'Coordinate Pairs',40).   $result=&Apache::edit::tag_start($target,$token,'Rectangle').
         &Apache::edit::entercoordpair(undef,'textnode').      &Apache::edit::editline($token->[1],$coords,'Coordinate Pairs',40).
         &Apache::edit::end_row();      &Apache::edit::entercoord(undef,'textnode',undef,undef,'box').
   } elsif ($target eq "modified") {      &Apache::edit::end_row();
     my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser);      } elsif ($target eq "modified") {
     $result=$token->[4].&Apache::edit::modifiedfield($token);   &Apache::edit::deletecoorddata();
     &Apache::lonxml::debug($result);   $result=$token->[4].&Apache::edit::modifiedfield('/rectangle',$parser);
   }      }
   return $result;      return $result;
 }  }
   
 sub grade_rectangle {  sub grade_rectangle {
   my ($spec,$x,$y) = @_;      my ($spec,$x,$y) = @_;
   &Apache::lonxml::debug("Spec is $spec");      &Apache::lonxml::debug("Spec is $spec");
   $spec=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/;      my ($x1,$y1,$x2,$y2)=($spec=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/);
   my $x1=$1;      &Apache::lonxml::debug("Point $x1,$y1,$x2,$y2");
   my $y1=$2;      if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
   my $x2=$3;      if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
   my $y2=$4;      if (($x >= $x1) && ($x <= $x2) && ($y >= $y1) && ($y <= $y2)) {
   &Apache::lonxml::debug("Point $x1,$y1,$x2,$y2");   return 'APPROX_ANS';
   if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }      }
   if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }      return 'INCORRECT';
   if (($x >= $x1) && ($x <= $x2) && ($y >= $y1) && ($y <= $y2)) {  
     return 'APPROX_ANS';  
   }  
   return 'INCORRECT';  
 }  }
   
 sub end_rectangle {  sub end_rectangle {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result;      my $result;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {      if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
     my $name = $Apache::imageresponse::curname;   $target eq 'analyze' || $target eq 'answer') {
     my $area = &Apache::lonxml::endredirection;   my $name = $Apache::imageresponse::curname;
     &Apache::lonxml::debug("out is $area for $name");   my $area = &Apache::lonxml::endredirection;
     if ( $Apache::imageresponse::conceptgroup   $area=~s/\s//g;
  && !&Apache::response::showallfoils()) {   &Apache::lonxml::debug("out is $area for $name");
       push @{ $Apache::response::conceptgroup{"$name.area"} },"rectangle:$area";   if ( $Apache::imageresponse::conceptgroup
        && !&Apache::response::showallfoils()
        ) {
       push @{ $Apache::response::conceptgroup{"$name.area"} },"rectangle:$area";
    } else {
       push @{ $Apache::response::foilgroup{"$name.area"} },"rectangle:$area";
    }
       } elsif ($target eq 'edit') {
    $result=&Apache::edit::end_table();
       }
       return $result;
   }
   
   sub start_polygon {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result='';
       if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
    $target eq 'analyze' || $target eq 'answer') { 
    &Apache::lonxml::startredirection; 
       } elsif ($target eq 'edit') {
    my $coords=&Apache::lonxml::get_all_text('/polygon',$parser,$style);
    $result=&Apache::edit::tag_start($target,$token,'Polygon').
       &Apache::edit::editline($token->[1],$coords,'Coordinate list',40).
       &Apache::edit::entercoord(undef,'textnode',undef,undef,'polygon').
       &Apache::edit::end_row();
       } elsif ($target eq "modified") {
    $result=$token->[4].&Apache::edit::modifiedfield('/polygon',$parser);
       }
       return $result;
   }
   
   sub grade_polygon {
       my ($spec,$x,$y) = @_;
       &Apache::lonxml::debug("Spec is $spec");
       $spec=~s/^polygon://;
       my @polygon;
       foreach my $coord (split('-',$spec)) {
    my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
    &Apache::lonxml::debug("x $x y $y");
    push @polygon, {'x'=>$x,'y'=>$y};
       }
       #make end point start point
       push @polygon, $polygon[0];
       # cribbed from
       # http://geometryalgorithms.com/Archive/algorithm_0103/algorithm_0103.htm
       my $crossing = 0;    # the crossing number counter
   
       # loop through all edges of the polygon
       for (my $i=0; $i<$#polygon; $i++) {    # edge from V[i] to V[i+1]
    if ((($polygon[$i]->{'y'} <= $y)
        && ($polygon[$i+1]->{'y'} > $y))    # an upward crossing
       || 
       (($polygon[$i]->{'y'} > $y) 
        && ($polygon[$i+1]->{'y'} <= $y))) { # a downward crossing
       # compute the actual edge-ray intersect x-coordinate
               my $vt = ($y - $polygon[$i]->{'y'}) 
    / ($polygon[$i+1]->{'y'} - $polygon[$i]->{'y'});
               if ($x < $polygon[$i]->{'x'} + $vt * 
    ($polygon[$i+1]->{'x'} - $polygon[$i]->{'x'})) { # x<intersect
                   $crossing++;   # a valid crossing of y=P.y right of P.x
       }
    }
       }
   
       # 0 if even (out), and 1 if odd (in)
       if ($crossing%2) {
    return 'APPROX_ANS';
     } else {      } else {
       push @{ $Apache::response::foilgroup{"$name.area"} },"rectangle:$area";   return 'INCORRECT';
       }
   }
   
   sub end_polygon {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result;
       if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
    $target eq 'analyze' || $target eq 'answer') {
    my $name = $Apache::imageresponse::curname;
    my $area = &Apache::lonxml::endredirection;
    $area=~s/\s*//g;
    &Apache::lonxml::debug("out is $area for $name");
    if ( $Apache::imageresponse::conceptgroup
        && !&Apache::response::showallfoils()
        ) {
       push @{ $Apache::response::conceptgroup{"$name.area"} },"polygon:$area";
    } else {
       push @{ $Apache::response::foilgroup{"$name.area"} },"polygon:$area";
    }
       } elsif ($target eq 'edit') {
    $result=&Apache::edit::end_table();
     }      }
   } elsif ($target eq 'edit') {      return $result;
       $result=&Apache::edit::end_table();  
   }  
   return $result;  
 }  }
 1;  1;
 __END__  __END__
Removed from v.1.35  
changed lines
  Added in v.1.102

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