version 1.36, 2003/09/24 19:20:58
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version 1.44, 2004/01/14 22:59:18
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# The LearningOnline Network with CAPA |
# The LearningOnline Network with CAPA |
# image click response style |
# image click response style |
# |
# |
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# |
# |
# http://www.lon-capa.org/ |
# http://www.lon-capa.org/ |
# |
# |
# July,August 2003 H. K. Ng |
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# |
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#FIXME LATER assumes multiple possible submissions but only one is possible |
#FIXME LATER assumes multiple possible submissions but only one is possible |
#currently |
#currently |
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package Apache::imageresponse; |
package Apache::imageresponse; |
use Apache::randomlylabel; |
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use strict; |
use strict; |
use Image::Magick; |
use Image::Magick; |
use GD; |
use Apache::randomlylabel; |
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use Apache::Constants qw(:common :http); |
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BEGIN { |
BEGIN { |
&Apache::lonxml::register('Apache::imageresponse',('imageresponse')); |
&Apache::lonxml::register('Apache::imageresponse',('imageresponse')); |
Line 44 sub start_imageresponse {
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Line 43 sub start_imageresponse {
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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', |
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('foilgroup','foil','text','image','rectangle', |
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'polygon','conceptgroup')); |
push (@Apache::lonxml::namespace,'imageresponse'); |
push (@Apache::lonxml::namespace,'imageresponse'); |
my $id = &Apache::response::start_response($parstack,$safeeval); |
my $id = &Apache::response::start_response($parstack,$safeeval); |
if ($target eq 'meta') { |
if ($target eq 'meta') { |
$result=&Apache::response::meta_package_write('imageresponse'); |
$result=&Apache::response::meta_package_write('imageresponse'); |
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} elsif ($target eq 'analyze') { |
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my $part_id="$Apache::inputtags::part.$id"; |
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push (@{ $Apache::lonhomework::analyze{"parts"} },$part_id); |
} |
} |
return $result; |
return $result; |
} |
} |
Line 102 sub whichfoils {
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Line 106 sub whichfoils {
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return @whichopt; |
return @whichopt; |
} |
} |
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sub prep_image { |
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my ($image,$mode,$name)=@_; |
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my $part=$Apache::inputtags::part; |
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my $respid=$Apache::inputtags::response['-1']; |
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my $id=&Apache::loncommon::get_cgi_id(); |
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my %x; |
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$x{"cgi.$id.BGIMG"}=$image; |
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my ($x,$y)=split(/:/,$Apache::lonhomework::history{"resource.$part.$respid.submission"}); |
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#draws 2 xs on the image at the clicked location |
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#one in white and then one in red on top of the one in white |
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if (defined($x) && defined($y)) { |
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$x{"cgi.$id.LINECOUNT"}=4; |
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my $length = 6; |
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my $width = 1; |
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my $extrawidth = 2; |
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$x{"cgi.$id.LINE0"}= |
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join(':',(($x-$length),($y-$length),($x+$length),($y+$length), |
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"FFFFFF",($width+$extrawidth))); |
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$x{"cgi.$id.LINE1"}= |
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join(':',(($x-$length),($y+$length),($x+$length),($y-$length), |
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"FFFFFF",($width+$extrawidth))); |
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$x{"cgi.$id.LINE2"}= |
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join(':',(($x-$length),($y-$length),($x+$length),($y+$length), |
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"FF0000",($width))); |
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$x{"cgi.$id.LINE3"}= |
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join(':',(($x-$length),($y+$length),($x+$length),($y-$length), |
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"FF0000",($width))); |
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} |
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if ($mode eq 'answer') { |
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my $width = 1; |
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my $extrawidth = 2; |
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my @areas = @{ $Apache::response::foilgroup{"$name.area"} }; |
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foreach my $area (@areas) { |
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if ($area=~/^rectangle:/) { |
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my ($x1,$y1,$x2,$y2)= |
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($area=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/); |
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my $i=$x{"cgi.$id.BOXCOUNT"}++; |
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$x{"cgi.$id.BOX$i"}=join(':',($x1,$y1,$x2,$y2,"FFFFFF", |
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($width+$extrawidth))); |
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$i=$x{"cgi.$id.BOXCOUNT"}++; |
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$x{"cgi.$id.BOX$i"}=join(':',($x1,$y1,$x2,$y2,"00FF00",$width)); |
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} elsif ($area=~/^polygon:(.*)/) { |
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my $i=$x{"cgi.$id.POLYCOUNT"}++; |
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$x{"cgi.$id.POLYOPT$i"}=join(':',("FFFFFF",($width+$extrawidth))); |
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$x{"cgi.$id.POLY$i"}=$1; |
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$i=$x{"cgi.$id.POLYCOUNT"}++; |
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$x{"cgi.$id.POLYOPT$i"}=join(':',("00FF00",$width)); |
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$x{"cgi.$id.POLY$i"}=$1; |
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} |
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} |
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} |
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&Apache::lonnet::appenv(%x); |
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return $id; |
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} |
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sub displayfoils { |
sub displayfoils { |
my ($target,@whichopt) = @_; |
my ($target,@whichopt) = @_; |
my $result =''; |
my $result =''; |
Line 113 sub displayfoils {
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Line 172 sub displayfoils {
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if ($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"); |
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if ( $target eq 'web' && $image !~ /^http:/ ) { |
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$image=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$image); |
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if (&Apache::lonnet::repcopy($image) ne OK) { |
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$image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif'; |
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} |
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} |
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&Apache::lonxml::debug("image is $image"); |
if ( &Apache::response::show_answer() ) { |
if ( &Apache::response::show_answer() ) { |
if ($target eq 'tex') { |
if ($target eq 'tex') { |
$result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n"; |
$result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n"; |
} else { |
} else { |
$result.="<img src=\"$image\"/> <br />\n"; |
my $token=&prep_image($image,'answer',$name); |
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$result.="<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n"; |
} |
} |
} else { |
} else { |
if ($target eq 'tex') { |
if ($target eq 'tex') { |
$result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n"; |
$result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n"; |
} else { |
} else { |
$result.="<input type=\"image\" name=\"HWVAL_$Apache::inputtags::response['-1']:$temp\" src=\"$image\"/> <br />\n"; |
my $id=$Apache::inputtags::response['-1']; |
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my $token=&prep_image($image); |
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my $temp=1; |
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$result.="<input type=\"image\" name=\"HWVAL_$id:$temp\" ". |
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"src=\"/adm/randomlabel.png?token=$token\" /><br />\n"; |
} |
} |
} |
} |
$temp++; |
$temp++; |
Line 152 sub gradefoils {
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Line 223 sub gradefoils {
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&Apache::lonxml::debug("Area of type $1"); |
&Apache::lonxml::debug("Area of type $1"); |
if ($1 eq 'rectangle') { |
if ($1 eq 'rectangle') { |
$grade=&grade_rectangle($area,$x,$y); |
$grade=&grade_rectangle($area,$x,$y); |
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} elsif ($1 eq 'polygon') { |
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$grade=&grade_polygon($area,$x,$y); |
} else { |
} else { |
&Apache::lonxml::error("Unknown area style $area"); |
&Apache::lonxml::error("Unknown area style $area"); |
} |
} |
Line 174 sub end_foilgroup {
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Line 247 sub end_foilgroup {
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my ($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' || $target eq 'tex') { |
if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' || |
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$target eq 'analyze') { |
my ($count,$max) = &getfoilcounts($parstack,$safeeval); |
my ($count,$max) = &getfoilcounts($parstack,$safeeval); |
if ($count>$max) { $count=$max } |
if ($count>$max) { $count=$max } |
&Apache::lonxml::debug("Count is $count from $max"); |
&Apache::lonxml::debug("Count is $count from $max"); |
Line 183 sub end_foilgroup {
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Line 257 sub end_foilgroup {
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$result=&displayfoils($target,@whichopt); |
$result=&displayfoils($target,@whichopt); |
} elsif ($target eq 'grade') { |
} elsif ($target eq 'grade') { |
if ( defined $ENV{'form.submitted'}) { &gradefoils(@whichopt); } |
if ( defined $ENV{'form.submitted'}) { &gradefoils(@whichopt); } |
} |
} elsif ( $target eq 'analyze') { |
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&Apache::response::analyze_store_foilgroup(\@whichopt, |
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['text','image','area']); |
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} |
} elsif ($target eq 'edit') { |
} elsif ($target eq 'edit') { |
$result=&Apache::edit::end_table(); |
$result=&Apache::edit::end_table(); |
} |
} |
Line 200 sub end_conceptgroup {
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Line 277 sub end_conceptgroup {
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my ($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'} }, $name; |
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$Apache::response::foilgroup{"$name.text"} = $Apache::response::conceptgroup{"$name.text"}; |
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$Apache::response::foilgroup{"$name.image"} = $Apache::response::conceptgroup{"$name.image"}; |
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push(@{ $Apache::response::foilgroup{"$name.area"} }, @{ $Apache::response::conceptgroup{"$name.area"} }); |
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my $concept = &Apache::lonxml::get_param('concept',$parstack,$safeeval); |
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$Apache::response::foilgroup{"$name.concept"} = $concept; |
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&Apache::lonxml::debug("Selecting $name in $concept"); |
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} |
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} |
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} elsif ($target eq 'edit') { |
} elsif ($target eq 'edit') { |
$result=&Apache::edit::end_table(); |
$result=&Apache::edit::end_table(); |
} |
} |
Line 234 sub insert_foil {
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Line 302 sub insert_foil {
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$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' || $target eq 'tex') { |
if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' || |
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$target eq 'analyze') { |
my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval); |
my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval); |
if ($name eq '') { $name=$Apache::lonxml::curdepth; } |
if ($name eq '') { $name=$Apache::lonxml::curdepth; } |
if ( $Apache::imageresponse::conceptgroup |
if ( $Apache::imageresponse::conceptgroup |
Line 260 sub end_foil {
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Line 329 sub end_foil {
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sub start_text { |
sub start_text { |
my ($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' || $target eq 'analyze') { |
&Apache::lonxml::startredirection; |
&Apache::lonxml::startredirection; |
} elsif ($target eq 'edit') { |
} elsif ($target eq 'edit') { |
my $descr=&Apache::lonxml::get_all_text('/text',$parser); |
my $descr=&Apache::lonxml::get_all_text('/text',$parser); |
Line 268 sub start_text {
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Line 337 sub start_text {
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&Apache::edit::editfield($token->[1],$descr,'Text',60,2). |
&Apache::edit::editfield($token->[1],$descr,'Text',60,2). |
&Apache::edit::end_row(); |
&Apache::edit::end_row(); |
} elsif ($target eq "modified") { |
} elsif ($target eq "modified") { |
my $descr=&Apache::lonxml::get_all_text('/text',$parser); |
$result=$token->[4].&Apache::edit::modifiedfield('/text',$parser); |
$result=$token->[4].&Apache::edit::modifiedfield($token); |
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&Apache::lonxml::debug($result); |
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} |
} |
return $result; |
return $result; |
} |
} |
Line 278 sub start_text {
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Line 345 sub start_text {
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sub end_text { |
sub end_text { |
my ($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; |
my $name = $Apache::imageresponse::curname; |
if ( $Apache::imageresponse::conceptgroup |
if ( $Apache::imageresponse::conceptgroup |
&& !&Apache::response::showallfoils() ) { |
&& !&Apache::response::showallfoils() ) { |
Line 295 sub end_text {
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Line 362 sub end_text {
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sub start_image { |
sub start_image { |
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; |
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; |
my $result=''; |
my $result=''; |
if ($target eq 'web' || $target eq 'tex') { |
if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') { |
&Apache::lonxml::startredirection; |
&Apache::lonxml::startredirection; |
} elsif ($target eq 'edit') { |
} elsif ($target eq 'edit') { |
my $bgimg=&Apache::lonxml::get_all_text('/image',$parser); |
my $bgimg=&Apache::lonxml::get_all_text('/image',$parser); |
Line 308 sub start_image {
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Line 375 sub start_image {
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$result.=&Apache::edit::search(undef,'textnode'). |
$result.=&Apache::edit::search(undef,'textnode'). |
&Apache::edit::end_row(); |
&Apache::edit::end_row(); |
} elsif ($target eq "modified") { |
} elsif ($target eq "modified") { |
my $bgimg=&Apache::lonxml::get_all_text('/image',$parser); |
$result=$token->[4].&Apache::edit::modifiedfield('/image',$parser); |
$result=$token->[4].&Apache::edit::modifiedfield($token); |
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&Apache::lonxml::debug($result); |
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} |
} |
return $result; |
return $result; |
} |
} |
Line 322 sub end_image {
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Line 387 sub end_image {
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if ($target eq 'web') { |
if ($target eq 'web') { |
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"}; |
$Apache::response::conceptgroup{"$name.image"} = $image; |
my $y=$ENV{"form.HWVAL_$id:$temp.y"}; |
} else { |
if (defined ($x) && defined ($y)) { |
$Apache::response::foilgroup{"$name.image"} = $image; |
&Apache::lonxml::debug("x and y defined as $x,$y"); |
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my $currentImage = &Apache::randomlylabel::get_image('/home/httpd/html'.$image,1); |
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if (! defined($currentImage)) { |
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&Apache::lonnet::logthis('Unable to create image object for '.$image); |
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return ''; |
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} |
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my $red; |
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if (!($red = $currentImage->colorResolve(255,0,0))) { |
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$red = $currentImage->colorClosestHWB(255,0,0); |
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} |
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my $length = 6; |
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$currentImage->line($x-$length,$y-$length,$x+$length,$y+$length,$red); |
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$currentImage->line($x-$length,$y+$length,$x+$length,$y-$length,$red); |
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my ($nameWOext) = ($image =~ /^.*\/(.*)\..*$/); |
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&Apache::lonxml::debug("graph name $nameWOext"); |
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my $webImageName = "/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_". |
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$nameWOext.'.png'; #needs to be more random or specific |
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my $newImageName = '/home/httpd'.$webImageName; |
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my $imgfh = Apache::File->new('>'.$newImageName); |
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print $imgfh $currentImage->png; |
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$image = $webImageName; |
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} |
} |
&Apache::lonxml::debug("out image is $image"); |
} elsif ($target eq 'analyze') { |
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my $image = &Apache::lonxml::endredirection; |
if ( $Apache::imageresponse::conceptgroup |
if ( $Apache::imageresponse::conceptgroup |
&& !&Apache::response::showallfoils()) { |
&& !&Apache::response::showallfoils()) { |
$Apache::response::conceptgroup{"$name.image"} = $image; |
$Apache::response::conceptgroup{"$name.image"} = $image; |
Line 439 sub end_image {
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Line 482 sub end_image {
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sub start_rectangle { |
sub start_rectangle { |
my ($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' || $target eq 'tex' || |
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$target eq 'analyze') { |
&Apache::lonxml::startredirection; |
&Apache::lonxml::startredirection; |
} elsif ($target eq 'edit') { |
} elsif ($target eq 'edit') { |
my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser); |
my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser); |
$result=&Apache::edit::tag_start($target,$token,'Rectangle'). |
$result=&Apache::edit::tag_start($target,$token,'Rectangle'). |
&Apache::edit::editline($token->[1],$coords,'Coordinate Pairs',40). |
&Apache::edit::editline($token->[1],$coords,'Coordinate Pairs',40). |
&Apache::edit::entercoordpair(undef,'textnode'). |
&Apache::edit::entercoord(undef,'textnode',undef,undef,'box'). |
&Apache::edit::end_row(); |
&Apache::edit::end_row(); |
} elsif ($target eq "modified") { |
} elsif ($target eq "modified") { |
my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser); |
&Apache::edit::deletecoorddata(); |
$result=$token->[4].&Apache::edit::modifiedfield($token); |
$result=$token->[4].&Apache::edit::modifiedfield('/rectangle',$parser); |
&Apache::lonxml::debug($result); |
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} |
} |
return $result; |
return $result; |
} |
} |
Line 458 sub start_rectangle {
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Line 501 sub start_rectangle {
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sub grade_rectangle { |
sub grade_rectangle { |
my ($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; |
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my $y1=$2; |
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my $x2=$3; |
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my $y2=$4; |
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&Apache::lonxml::debug("Point $x1,$y1,$x2,$y2"); |
&Apache::lonxml::debug("Point $x1,$y1,$x2,$y2"); |
if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; } |
if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; } |
if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; } |
if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; } |
Line 475 sub grade_rectangle {
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Line 514 sub grade_rectangle {
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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' || $target eq 'tex' || |
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$target eq 'analyze') { |
my $name = $Apache::imageresponse::curname; |
my $name = $Apache::imageresponse::curname; |
my $area = &Apache::lonxml::endredirection; |
my $area = &Apache::lonxml::endredirection; |
&Apache::lonxml::debug("out is $area for $name"); |
&Apache::lonxml::debug("out is $area for $name"); |
Line 487 sub end_rectangle {
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Line 527 sub end_rectangle {
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} |
} |
} elsif ($target eq 'edit') { |
} elsif ($target eq 'edit') { |
$result=&Apache::edit::end_table(); |
$result=&Apache::edit::end_table(); |
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} |
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return $result; |
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} |
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sub start_polygon { |
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my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_; |
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my $result=''; |
|
if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' || |
|
$target eq 'analyze') { |
|
&Apache::lonxml::startredirection; |
|
} elsif ($target eq 'edit') { |
|
my $coords=&Apache::lonxml::get_all_text('/polygon',$parser); |
|
$result=&Apache::edit::tag_start($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 { |
|
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') { |
|
my $name = $Apache::imageresponse::curname; |
|
my $area = &Apache::lonxml::endredirection; |
|
&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(); |
} |
} |
return $result; |
return $result; |
} |
} |