1: #
2: # The LearningOnline Network with CAPA
3: # image click response style
4: #
5: # $Id: imageresponse.pm,v 1.96 2008/11/18 19:14:28 jms Exp $
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: #FIXME LATER assumes multiple possible submissions but only one is possible
30: #currently
31:
32:
33: =head1 NAME
34:
35: Apache::imageresponse
36:
37: =head1 SYNOPSIS
38:
39: Coordinates the response to clicking an image.
40:
41: This is part of the LearningOnline Network with CAPA project
42: described at http://www.lon-capa.org.
43:
44: =head1 SUBROUTINES
45:
46: =over
47:
48: =item start_imageresponse()
49:
50: =item end_imageresponse()
51:
52: =item start_foilgroup()
53:
54: =item getfoilcounts()
55:
56: =item whichfoils()
57:
58: =item prep_image()
59:
60: =item draw_image()
61:
62: =item displayfoils()
63:
64: =item format_prior_response()
65:
66: =item display_answers()
67:
68: =item clean_up_image()
69:
70: =item gradefoils()
71:
72: =item stringify_submission()
73:
74: =item get_submission()
75:
76: =item end_foilgroup()
77:
78: =item start_conceptgroup()
79:
80: =item end_conceptgroup()
81:
82: =item insert_foil()
83:
84: =item start_foil()
85:
86: =item end_foil()
87:
88: =item start_text()
89:
90: =item end_text()
91:
92: =item start_image()
93:
94: =item end_image()
95:
96: =item start_rectangle()
97:
98: =item grade_rectangle()
99:
100: =item end_rectangle()
101:
102: =item start_polygon()
103:
104: =item grade_polygon()
105:
106: =item end_polygon()
107:
108: =back
109:
110: =cut
111:
112:
113: package Apache::imageresponse;
114: use strict;
115: use Image::Magick();
116: use Apache::randomlylabel();
117: use Apache::londefdef();
118: use Apache::Constants qw(:common :http);
119: use Apache::lonlocal;
120: use Apache::lonnet;
121: use lib '/home/httpd/lib/perl/';
122: use LONCAPA;
123:
124:
125: BEGIN {
126: &Apache::lonxml::register('Apache::imageresponse',('imageresponse'));
127: }
128:
129: sub start_imageresponse {
130: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
131: my $result;
132: #when in a radiobutton response use these
133: &Apache::lonxml::register('Apache::imageresponse',
134: ('foilgroup','foil','text','image','rectangle',
135: 'polygon','conceptgroup'));
136: push (@Apache::lonxml::namespace,'imageresponse');
137: my $id = &Apache::response::start_response($parstack,$safeeval);
138: undef(%Apache::response::foilnames);
139: if ($target eq 'meta') {
140: $result=&Apache::response::meta_package_write('imageresponse');
141: } elsif ($target eq 'analyze') {
142: my $part_id="$Apache::inputtags::part.$id";
143: $Apache::lonhomework::analyze{"$part_id.type"} = 'imageresponse';
144: push (@{ $Apache::lonhomework::analyze{"parts"} },$part_id);
145: push (@{ $Apache::lonhomework::analyze{"$part_id.bubble_lines"} },
146: 1);
147: } elsif ( $target eq 'edit' ) {
148: $result .= &Apache::edit::tag_start($target,$token).
149: &Apache::edit::text_arg('Max Number Of Shown Foils:',
150: 'max',$token,'4').
151: &Apache::edit::end_row().
152: &Apache::edit::start_spanning_row();
153: } elsif ( $target eq 'modified' ) {
154: my $constructtag=
155: &Apache::edit::get_new_args($token,$parstack,$safeeval,'max');
156: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
157: }
158: return $result;
159: }
160:
161: sub end_imageresponse {
162: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
163:
164: my $part_id = $Apache::inputtags::part;
165: my $response_id = $Apache::inputtags::response[-1];
166:
167: pop(@Apache::lonxml::namespace);
168: &Apache::lonxml::deregister('Apache::imageresponse',('foilgroup','foil','text','image','rectangle','conceptgroup'));
169:
170: my $result;
171: if ($target eq 'edit') {
172: $result=&Apache::edit::end_table();
173: } elsif ($target eq 'tex'
174: && $Apache::lonhomework::type eq 'exam') {
175: $result=&Apache::inputtags::exam_score_line($target);
176: }
177:
178: undef(%Apache::response::foilnames);
179:
180: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
181: $target eq 'tex' || $target eq 'analyze') {
182: &Apache::lonxml::increment_counter(&Apache::response::repetition(),
183: "$part_id.$response_id");
184: if ($target eq 'analyze') {
185: &Apache::lonhomework::set_bubble_lines();
186: }
187:
188: }
189: &Apache::response::end_response();
190:
191: return $result;
192: }
193:
194: %Apache::response::foilgroup=();
195: sub start_foilgroup {
196: %Apache::response::foilgroup=();
197: $Apache::imageresponse::conceptgroup=0;
198: &Apache::response::pushrandomnumber();
199: return '';
200: }
201:
202: sub getfoilcounts {
203: my ($parstack,$safeeval)=@_;
204:
205: my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
206: # +1 since instructors will count from 1
207: my $count = $#{ $Apache::response::foilgroup{'names'} }+1;
208: if (&Apache::response::showallfoils()) { $max=$count; }
209: return ($count,$max);
210: }
211:
212: sub whichfoils {
213: my ($max)=@_;
214: return if (!defined(@{ $Apache::response::foilgroup{'names'} }));
215: my @names = @{ $Apache::response::foilgroup{'names'} };
216: my @whichopt;
217: while ((($#whichopt+1) < $max) && ($#names > -1)) {
218: &Apache::lonxml::debug("Have $#whichopt max is $max");
219: my $aopt;
220: if (&Apache::response::showallfoils()) {
221: $aopt=0;
222: } else {
223: $aopt=int(&Math::Random::random_uniform() * ($#names+1));
224: }
225: &Apache::lonxml::debug("From $#names elms, picking $aopt");
226: $aopt=splice(@names,$aopt,1);
227: &Apache::lonxml::debug("Picked $aopt");
228: push(@whichopt,$aopt);
229: }
230: return @whichopt;
231: }
232:
233: sub prep_image {
234: my ($image,$mode,$name)=@_;
235:
236: my ($x,$y)= &get_submission($name);
237: &Apache::lonxml::debug("for $name drawing click at $x and $y");
238: &draw_image($mode,$image,$x,$y,$Apache::response::foilgroup{"$name.area"});
239: }
240:
241: sub draw_image {
242: my ($mode,$image,$x,$y,$areas) = @_;
243:
244: my $id=&Apache::loncommon::get_cgi_id();
245:
246: my (%x,$i);
247: $x{"cgi.$id.BGIMG"}=&escape($image);
248:
249: #draws 2 xs on the image at the clicked location
250: #one in white and then one in red on top of the one in white
251:
252: if (defined($x) && $x =~/\S/
253: && defined($y) && $y =~/\S/
254: && ($mode eq 'submission' || !&Apache::response::show_answer())
255: && $mode ne 'answeronly') {
256: my $length = 6;
257: my $width = 1;
258: my $extrawidth = 2;
259: my $xmin=($x-$length);
260: my $xmax=($x+$length);
261: my $ymin=($y-$length);
262: my $ymax=($y+$length);
263:
264: $x{"cgi.$id.OBJTYPE"}.='LINE:';
265: $i=$x{"cgi.$id.OBJCOUNT"}++;
266: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymin),($xmax),($ymax),
267: "FFFFFF",($width+$extrawidth)));
268: $x{"cgi.$id.OBJTYPE"}.='LINE:';
269: $i=$x{"cgi.$id.OBJCOUNT"}++;
270: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymax),($xmax),($ymin),
271: "FFFFFF",($width+$extrawidth)));
272: $x{"cgi.$id.OBJTYPE"}.='LINE:';
273: $i=$x{"cgi.$id.OBJCOUNT"}++;
274: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymin),($xmax),($ymax),
275: "FF0000",($width)));
276: $x{"cgi.$id.OBJTYPE"}.='LINE:';
277: $i=$x{"cgi.$id.OBJCOUNT"}++;
278: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymax),($xmax),($ymin),
279: "FF0000",($width)));
280: }
281: if ($mode eq 'answer' || $mode eq 'answeronly') {
282: my $width = 1;
283: my $extrawidth = 2;
284: foreach my $area (@{ $areas }) {
285: if ($area=~/^rectangle:/) {
286: $x{"cgi.$id.OBJTYPE"}.='RECTANGLE:';
287: $i=$x{"cgi.$id.OBJCOUNT"}++;
288: my ($x1,$y1,$x2,$y2)=
289: ($area=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/);
290: $x{"cgi.$id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,"FFFFFF",
291: ($width+$extrawidth)));
292: $x{"cgi.$id.OBJTYPE"}.='RECTANGLE:';
293: $i=$x{"cgi.$id.OBJCOUNT"}++;
294: $x{"cgi.$id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,"00FF00",$width));
295: } elsif ($area=~/^polygon:(.*)/) {
296: $x{"cgi.$id.OBJTYPE"}.='POLYGON:';
297: $i=$x{"cgi.$id.OBJCOUNT"}++;
298: $x{"cgi.$id.OBJ$i"}=join(':',("FFFFFF",($width+$extrawidth)));
299: $x{"cgi.$id.OBJEXTRA$i"}=$1;
300: $x{"cgi.$id.OBJTYPE"}.='POLYGON:';
301: $i=$x{"cgi.$id.OBJCOUNT"}++;
302: $x{"cgi.$id.OBJ$i"}=join(':',("00FF00",$width));
303: $x{"cgi.$id.OBJEXTRA$i"}=$1;
304: }
305: }
306: }
307: &Apache::lonnet::appenv(\%x);
308: return $id;
309: }
310:
311: sub displayfoils {
312: my ($target,@whichopt) = @_;
313: my $result ='';
314: my $temp=1;
315: my @images;
316: foreach my $name (@whichopt) {
317: $result.=$Apache::response::foilgroup{"$name.text"};
318: &Apache::lonxml::debug("Text is $result");
319: if ($target eq 'tex') {$result.="\\vskip 0 mm \n";} else {$result.="<br />\n";}
320: my $image=$Apache::response::foilgroup{"$name.image"};
321: &Apache::lonxml::debug("image is $image");
322: if ( ($target eq 'web' || $target eq 'answer')
323: && $image !~ /^http:/ ) {
324: $image=&clean_up_image($image);
325: }
326: push(@images,$image);
327: &Apache::lonxml::debug("image is $image");
328: if ( &Apache::response::show_answer() ) {
329: if ($target eq 'tex') {
330: $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";
331: } else {
332: my $token=&prep_image($image,'answer',$name);
333: $result.="<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n";
334: }
335: } else {
336: if ($target eq 'tex') {
337: $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";
338: } else {
339: my $respid=$Apache::inputtags::response['-1'];
340: my $token=&prep_image($image,'submission',$name);
341: my $input_id = "HWVAL_$respid:$temp";
342: my $id = $env{'form.request.prefix'}.$input_id;
343: $result.='<img onclick="image_response_click(\''.$id.'\',event);"
344: src="/adm/randomlabel.png?token='.$token.'"
345: id="'.$id.'_imageresponse"
346: />'.
347: '<br />'.
348: '<input type="hidden" name="'.$input_id.'_token" value="'.$token.'" />'.
349: '<input type="hidden" name="'.$input_id.'" value="'.
350: join(':',&get_submission($name)).'" />';
351: }
352: }
353: $temp++;
354: }
355: if ($target eq 'web') {
356: &Apache::response::setup_prior_tries_hash(\&format_prior_response,
357: [\@images,\@whichopt]);
358: }
359: return $result;
360: }
361:
362: sub format_prior_response {
363: my ($mode,$answer,$other_data) = @_;
364:
365: my $result;
366:
367: # make a copy of the data in the refs
368: my @images = @{ $other_data->[0] };
369: my @foils = @{ $other_data->[1] };
370: foreach my $name (@foils) {
371: my $image = pop(@images);
372: my ($x,$y) = &get_submission($name,$answer);
373: my $token = &draw_image('submission',$image,$x,$y);
374: $result .=
375: '<img class="LC_prior_image"
376: src="/adm/randomlabel.png?token='.$token.'" /><br />';
377: }
378: return $result;
379: }
380:
381: sub display_answers {
382: my ($target,$whichopt)=@_;
383:
384: my $result=&Apache::response::answer_header('imageresponse');
385: foreach my $name (@$whichopt) {
386: my $image=$Apache::response::foilgroup{"$name.image"};
387: &Apache::lonxml::debug("image is $image");
388: if ( ($target eq 'web' || $target eq 'answer')
389: && $image !~ /^http:/ ) {
390: $image = &clean_up_image($image);
391: }
392: my $token=&prep_image($image,'answeronly',$name);
393:
394: $result.=&Apache::response::answer_part('imageresponse',"<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n");
395: }
396: $result.=&Apache::response::answer_footer('imageresponse');
397: return $result;
398: }
399:
400: sub clean_up_image {
401: my ($image)=@_;
402: if ($image =~ /\s*<img\s*/) {
403: ($image) = ($image =~ /src\s*=\s*[\"\']([^\"\']+)[\"\']/i);
404: if ($image !~ /^http:/) {
405: $image=&Apache::lonnet::hreflocation('',$image);
406: }
407: if (!$image) {
408: $image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif';
409: }
410: } else {
411: $image=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$image);
412: &Apache::lonxml::debug("repcopying: $image");
413: if (&Apache::lonnet::repcopy($image) ne 'ok') {
414: $image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif';
415: }
416: }
417: return $image;
418: }
419:
420: sub gradefoils {
421: my (@whichopt) = @_;
422:
423: my $partid = $Apache::inputtags::part;
424: my $id = $Apache::inputtags::response['-1'];
425:
426: if ($Apache::lonhomework::type eq 'exam') {
427: &Apache::response::scored_response($partid,$id);
428: return;
429: }
430:
431: my @results;
432: my $temp=1;
433: my %response;
434: foreach my $name (@whichopt) {
435: my ($x,$y) = split(':',$env{"form.HWVAL_$id:$temp"});
436: $response{$name} = $env{"form.HWVAL_$id:$temp"};
437: &Apache::lonxml::debug("Got a x of $x and a y of $y for $name");
438: if (defined($x) && defined($y) &&
439: defined(@{ $Apache::response::foilgroup{"$name.area"} })) {
440: my @areas = @{ $Apache::response::foilgroup{"$name.area"} };
441: my $grade="INCORRECT";
442: foreach my $area (@areas) {
443: &Apache::lonxml::debug("Area is $area for $name");
444: $area =~ m/([a-z]*):/;
445: &Apache::lonxml::debug("Area of type $1");
446: if ($1 eq 'rectangle') {
447: $grade=&grade_rectangle($area,$x,$y);
448: } elsif ($1 eq 'polygon') {
449: $grade=&grade_polygon($area,$x,$y);
450: } else {
451: &Apache::lonxml::error(&mt('Unknown area style [_1]',$area));
452: }
453: &Apache::lonxml::debug("Area said $grade");
454: if ($grade eq 'APPROX_ANS') { last; }
455: }
456: &Apache::lonxml::debug("Foil was $grade");
457: push(@results, $grade)
458: } else {
459: push(@results, 'MISSING_ANSWER')
460: }
461: $temp++;
462: }
463: my ($result) = &Apache::inputtags::finalizeawards(\@results,[]);
464: &Apache::lonxml::debug("Question is $result");
465:
466: my $part=$Apache::inputtags::part;
467: my %previous=
468: &Apache::response::check_for_previous(&stringify_submission(\%response),
469: $part,$id);
470: if ($result
471: && $Apache::lonhomework::type eq 'survey') { $result='SUBMITTED'; }
472: &Apache::response::handle_previous(\%previous,$result);
473: $Apache::lonhomework::results{"resource.$part.$id.submission"}=
474: &stringify_submission(\%response);
475: $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$result;
476: return;
477: }
478:
479: sub stringify_submission {
480: my ($response) = @_;
481: return &Apache::lonnet::hash2str(%{ $response });
482:
483:
484: }
485:
486: sub get_submission {
487: my ($name,$string) = @_;
488:
489: if (!defined($string)) {
490: my $part=$Apache::inputtags::part;
491: my $respid=$Apache::inputtags::response['-1'];
492: $string =
493: $Apache::lonhomework::history{"resource.$part.$respid.submission"};
494: }
495:
496: if ($string !~ /=/) {
497: return split(':',$string);
498: } else {
499: my %response = &Apache::lonnet::str2hash($string);
500: return split(':',$response{$name});
501: }
502: }
503:
504: sub end_foilgroup {
505: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
506: my $result='';
507: my @whichopt;
508:
509: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
510: $target eq 'analyze' || $target eq 'answer') {
511:
512: my ($count,$max) = &getfoilcounts($parstack,$safeeval);
513: if ($count>$max) { $count=$max }
514: &Apache::lonxml::debug("Count is $count from $max");
515:
516: @whichopt = &whichfoils($max);
517:
518: if ($target eq 'web' || $target eq 'tex') {
519: $result=&displayfoils($target,@whichopt);
520: $Apache::lonxml::post_evaluate=0;
521: } elsif ($target eq 'grade') {
522: if ( defined $env{'form.submitted'}) { &gradefoils(@whichopt); }
523: } elsif ( $target eq 'analyze') {
524: &Apache::response::analyze_store_foilgroup(\@whichopt,
525: ['text','image','area']);
526: } elsif ($target eq 'answer'
527: && $env{'form.answer_output_mode'} ne 'tex') {
528: $result=&display_answers($target,\@whichopt);
529: }
530:
531: } elsif ($target eq 'edit') {
532: $result=&Apache::edit::end_table();
533: }
534: &Apache::response::poprandomnumber();
535: return $result;
536: }
537:
538: sub start_conceptgroup {
539: $Apache::imageresponse::conceptgroup=1;
540: %Apache::response::conceptgroup=();
541: return '';
542: }
543:
544: sub end_conceptgroup {
545: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
546: $Apache::imageresponse::conceptgroup=0;
547: my $result;
548: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
549: $target eq 'analyze') {
550: &Apache::response::pick_foil_for_concept($target,
551: ['area','text','image'],
552: \%Apache::hint::image,
553: $parstack,$safeeval);
554: } elsif ($target eq 'edit') {
555: $result=&Apache::edit::end_table();
556: }
557: return $result;
558: }
559:
560: sub insert_foil {
561: return '
562: <foil>
563: <image></image>
564: <text></text>
565: <rectangle></rectangle>
566: </foil>
567: ';
568: }
569:
570: $Apache::imageresponse::curname='';
571: sub start_foil {
572: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
573: my $result;
574: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
575: $target eq 'analyze' || $target eq 'answer') {
576: my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
577: if ($name eq "") {
578: &Apache::lonxml::warning(&mt('Foils without names exist. This can cause problems to malfunction.'));
579: $name=$Apache::lonxml::curdepth;
580: }
581: if (defined($Apache::response::foilnames{$name})) {
582: &Apache::lonxml::error(&mt("Foil name [_1] appears more than once. Foil names need to be unique."
583: ,'<b><tt>'.$name.'</tt></b>'));
584: }
585: $Apache::response::foilnames{$name}++;
586: if ( $Apache::imageresponse::conceptgroup
587: && !&Apache::response::showallfoils()
588: ) {
589: push(@{ $Apache::response::conceptgroup{'names'} }, $name);
590: } else {
591: push(@{ $Apache::response::foilgroup{'names'} }, $name);
592: }
593: $Apache::imageresponse::curname=$name;
594: } elsif ($target eq 'edit') {
595: $result = &Apache::edit::tag_start($target,$token);
596: $result .= &Apache::edit::text_arg('Name:','name',$token);
597: $result .= &Apache::edit::end_row().
598: &Apache::edit::start_spanning_row();
599: } elsif ($target eq 'modified') {
600: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
601: $safeeval,'name');
602: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
603: }
604: return $result;;
605: }
606:
607: sub end_foil {
608: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
609: my $result;
610: if ($target eq 'edit') {
611: $result=&Apache::edit::end_table();
612: }
613: return $result;
614: }
615:
616: sub start_text {
617: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
618: my $result='';
619: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
620: || $target eq 'answer') {
621: &Apache::lonxml::startredirection;
622: } elsif ($target eq 'edit') {
623: my $descr=&Apache::lonxml::get_all_text('/text',$parser,$style);
624: $result=&Apache::edit::tag_start($target,$token,'Task Description').
625: &Apache::edit::editfield($token->[1],$descr,'Text',60,2).
626: &Apache::edit::end_row();
627: } elsif ($target eq "modified") {
628: $result=$token->[4].&Apache::edit::modifiedfield('/text',$parser);
629: }
630: return $result;
631: }
632:
633: sub end_text {
634: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
635: my $result;
636: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
637: || $target eq 'answer') {
638: my $name = $Apache::imageresponse::curname;
639: if ( $Apache::imageresponse::conceptgroup
640: && !&Apache::response::showallfoils()
641: ) {
642: $Apache::response::conceptgroup{"$name.text"} = &Apache::lonxml::endredirection;
643: } else {
644: $Apache::response::foilgroup{"$name.text"} = &Apache::lonxml::endredirection;
645: }
646: } elsif ($target eq 'edit') {
647: $result=&Apache::edit::end_table();
648: }
649: return $result;
650: }
651:
652: sub start_image {
653: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
654: my $result='';
655: my $only = join(',',&Apache::loncommon::filecategorytypes('Pictures'));
656: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
657: || $target eq 'answer') {
658: &Apache::lonxml::startredirection;
659: } elsif ($target eq 'edit') {
660: my $bgimg=&Apache::lonxml::get_all_text('/image',$parser,$style);
661: $Apache::edit::bgimgsrc=$bgimg;
662: $Apache::edit::bgimgsrcdepth=$Apache::lonxml::curdepth;
663:
664: $result=&Apache::edit::tag_start($target,$token,'Clickable Image').
665: &Apache::edit::editline($token->[1],$bgimg,'Image Source File',40);
666: $result.=&Apache::edit::browse(undef,'textnode',undef,$only).' ';
667: $result.=&Apache::edit::search(undef,'textnode').
668: &Apache::edit::end_row();
669: } elsif ($target eq "modified") {
670: $result=$token->[4].&Apache::edit::modifiedfield('/image',$parser);
671: }
672: return $result;
673: }
674:
675: sub end_image {
676: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
677: my $result;
678: my $name = $Apache::imageresponse::curname;
679: if ($target eq 'web' || $target eq 'answer') {
680: my $image = &Apache::lonxml::endredirection();
681: &Apache::lonxml::debug("original image is $image");
682: if ( $Apache::imageresponse::conceptgroup
683: && !&Apache::response::showallfoils()
684: ) {
685: $Apache::response::conceptgroup{"$name.image"} = $image;
686: } else {
687: $Apache::response::foilgroup{"$name.image"} = $image;
688: }
689: } elsif ($target eq 'analyze') {
690: my $image = &Apache::lonxml::endredirection();
691: if ( $Apache::imageresponse::conceptgroup
692: && !&Apache::response::showallfoils()
693: ) {
694: $Apache::response::conceptgroup{"$name.image"} = $image;
695: } else {
696: $Apache::response::foilgroup{"$name.image"} = $image;
697: }
698: } elsif ($target eq 'edit') {
699: $result=&Apache::edit::end_table();
700: } elsif ($target eq 'tex') {
701: my $src = &Apache::lonxml::endredirection();
702:
703: # There may be all sorts of whitespace on fore and aft:
704:
705: $src =~ s/\s+$//s;
706: $src =~ s/^\s+//s;
707:
708: #
709: # Gnuplot e.g. just generates the latex to put inplace.
710: #
711: my $graphinclude;
712: if ($src =~ /^%DYNAMICIMAGE/) {
713: # This is needed because the newline is not always passed -> tex.
714: # At present we don't care about the sizing info.
715:
716: my ($commentline, $restofstuff) = split(/\n/, $src);
717: $graphinclude = $src;
718: $graphinclude =~ s/^$commentline//;
719: } else {
720: my ($path,$file) = &Apache::londefdef::get_eps_image($src);
721: my ($height_param,$width_param)=
722: &Apache::londefdef::image_size($src,0.3,$parstack,$safeeval);
723: $graphinclude = '\graphicspath{{'.$path.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'}';
724: }
725: $Apache::response::foilgroup{"$name.image"} ='\vskip 0 mm \noindent '.$graphinclude;
726: }
727: return $result;
728: }
729:
730: sub start_rectangle {
731: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
732: my $result='';
733: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
734: $target eq 'analyze' || $target eq 'answer') {
735: &Apache::lonxml::startredirection;
736: } elsif ($target eq 'edit') {
737: my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser,$style);
738: $result=&Apache::edit::tag_start($target,$token,'Rectangle').
739: &Apache::edit::editline($token->[1],$coords,'Coordinate Pairs',40).
740: &Apache::edit::entercoord(undef,'textnode',undef,undef,'box').
741: &Apache::edit::end_row();
742: } elsif ($target eq "modified") {
743: &Apache::edit::deletecoorddata();
744: $result=$token->[4].&Apache::edit::modifiedfield('/rectangle',$parser);
745: }
746: return $result;
747: }
748:
749: sub grade_rectangle {
750: my ($spec,$x,$y) = @_;
751: &Apache::lonxml::debug("Spec is $spec");
752: my ($x1,$y1,$x2,$y2)=($spec=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/);
753: &Apache::lonxml::debug("Point $x1,$y1,$x2,$y2");
754: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
755: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
756: if (($x >= $x1) && ($x <= $x2) && ($y >= $y1) && ($y <= $y2)) {
757: return 'APPROX_ANS';
758: }
759: return 'INCORRECT';
760: }
761:
762: sub end_rectangle {
763: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
764: my $result;
765: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
766: $target eq 'analyze' || $target eq 'answer') {
767: my $name = $Apache::imageresponse::curname;
768: my $area = &Apache::lonxml::endredirection;
769: $area=~s/\s//g;
770: &Apache::lonxml::debug("out is $area for $name");
771: if ( $Apache::imageresponse::conceptgroup
772: && !&Apache::response::showallfoils()
773: ) {
774: push @{ $Apache::response::conceptgroup{"$name.area"} },"rectangle:$area";
775: } else {
776: push @{ $Apache::response::foilgroup{"$name.area"} },"rectangle:$area";
777: }
778: } elsif ($target eq 'edit') {
779: $result=&Apache::edit::end_table();
780: }
781: return $result;
782: }
783:
784: sub start_polygon {
785: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
786: my $result='';
787: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
788: $target eq 'analyze' || $target eq 'answer') {
789: &Apache::lonxml::startredirection;
790: } elsif ($target eq 'edit') {
791: my $coords=&Apache::lonxml::get_all_text('/polygon',$parser,$style);
792: $result=&Apache::edit::tag_start($target,$token,'Polygon').
793: &Apache::edit::editline($token->[1],$coords,'Coordinate list',40).
794: &Apache::edit::entercoord(undef,'textnode',undef,undef,'polygon').
795: &Apache::edit::end_row();
796: } elsif ($target eq "modified") {
797: $result=$token->[4].&Apache::edit::modifiedfield('/polygon',$parser);
798: }
799: return $result;
800: }
801:
802: sub grade_polygon {
803: my ($spec,$x,$y) = @_;
804: &Apache::lonxml::debug("Spec is $spec");
805: $spec=~s/^polygon://;
806: my @polygon;
807: foreach my $coord (split('-',$spec)) {
808: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
809: &Apache::lonxml::debug("x $x y $y");
810: push @polygon, {'x'=>$x,'y'=>$y};
811: }
812: #make end point start point
813: push @polygon, $polygon[0];
814: # cribbed from
815: # http://geometryalgorithms.com/Archive/algorithm_0103/algorithm_0103.htm
816: my $crossing = 0; # the crossing number counter
817:
818: # loop through all edges of the polygon
819: for (my $i=0; $i<$#polygon; $i++) { # edge from V[i] to V[i+1]
820: if ((($polygon[$i]->{'y'} <= $y)
821: && ($polygon[$i+1]->{'y'} > $y)) # an upward crossing
822: ||
823: (($polygon[$i]->{'y'} > $y)
824: && ($polygon[$i+1]->{'y'} <= $y))) { # a downward crossing
825: # compute the actual edge-ray intersect x-coordinate
826: my $vt = ($y - $polygon[$i]->{'y'})
827: / ($polygon[$i+1]->{'y'} - $polygon[$i]->{'y'});
828: if ($x < $polygon[$i]->{'x'} + $vt *
829: ($polygon[$i+1]->{'x'} - $polygon[$i]->{'x'})) { # x<intersect
830: $crossing++; # a valid crossing of y=P.y right of P.x
831: }
832: }
833: }
834:
835: # 0 if even (out), and 1 if odd (in)
836: if ($crossing%2) {
837: return 'APPROX_ANS';
838: } else {
839: return 'INCORRECT';
840: }
841: }
842:
843: sub end_polygon {
844: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
845: my $result;
846: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
847: $target eq 'analyze' || $target eq 'answer') {
848: my $name = $Apache::imageresponse::curname;
849: my $area = &Apache::lonxml::endredirection;
850: $area=~s/\s*//g;
851: &Apache::lonxml::debug("out is $area for $name");
852: if ( $Apache::imageresponse::conceptgroup
853: && !&Apache::response::showallfoils()
854: ) {
855: push @{ $Apache::response::conceptgroup{"$name.area"} },"polygon:$area";
856: } else {
857: push @{ $Apache::response::foilgroup{"$name.area"} },"polygon:$area";
858: }
859: } elsif ($target eq 'edit') {
860: $result=&Apache::edit::end_table();
861: }
862: return $result;
863: }
864: 1;
865: __END__
866:
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