1:
2: # The LearningOnline Network with CAPA
3: # image click response style
4: #
5: # $Id: imageresponse.pm,v 1.77 2006/05/18 22:02:03 albertel 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: package Apache::imageresponse;
33: use strict;
34: use Image::Magick();
35: use Apache::randomlylabel();
36: use Apache::londefdef();
37: use Apache::Constants qw(:common :http);
38: use Apache::lonlocal;
39: use Apache::lonnet;
40:
41: BEGIN {
42: &Apache::lonxml::register('Apache::imageresponse',('imageresponse'));
43: }
44:
45: sub start_imageresponse {
46: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
47: my $result;
48: #when in a radiobutton response use these
49: &Apache::lonxml::register('Apache::imageresponse',
50: ('foilgroup','foil','text','image','rectangle',
51: 'polygon','conceptgroup'));
52: push (@Apache::lonxml::namespace,'imageresponse');
53: my $id = &Apache::response::start_response($parstack,$safeeval);
54: undef(%Apache::response::foilnames);
55: if ($target eq 'meta') {
56: $result=&Apache::response::meta_package_write('imageresponse');
57: } elsif ($target eq 'analyze') {
58: my $part_id="$Apache::inputtags::part.$id";
59: push (@{ $Apache::lonhomework::analyze{"parts"} },$part_id);
60: }
61: return $result;
62: }
63:
64: sub end_imageresponse {
65: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
66:
67: pop(@Apache::lonxml::namespace);
68: &Apache::lonxml::deregister('Apache::imageresponse',('foilgroup','foil','text','image','rectangle','conceptgroup'));
69:
70: my $result;
71: if ($target eq 'edit') {
72: $result=&Apache::edit::end_table();
73: } elsif ($target eq 'tex'
74: && $Apache::lonhomework::type eq 'exam') {
75: $result=&Apache::inputtags::exam_score_line($target);
76: }
77:
78: undef(%Apache::response::foilnames);
79:
80: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
81: $target eq 'tex' || $target eq 'analyze') {
82: &Apache::lonxml::increment_counter(&Apache::response::repetition());
83: }
84: &Apache::response::end_response();
85:
86: return $result;
87: }
88:
89: %Apache::response::foilgroup=();
90: sub start_foilgroup {
91: %Apache::response::foilgroup=();
92: $Apache::imageresponse::conceptgroup=0;
93: &Apache::response::pushrandomnumber();
94: return '';
95: }
96:
97: sub getfoilcounts {
98: my ($parstack,$safeeval)=@_;
99:
100: my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
101: # +1 since instructors will count from 1
102: my $count = $#{ $Apache::response::foilgroup{'names'} }+1;
103: #if (&Apache::response::showallfoils()) { $max=$count; }
104: return ($count,$max);
105: }
106:
107: sub whichfoils {
108: my ($max)=@_;
109: if (!defined(@{ $Apache::response::foilgroup{'names'} })) { return; }
110: my @names = @{ $Apache::response::foilgroup{'names'} };
111: my @whichopt =();
112: while ((($#whichopt+1) < $max) && ($#names > -1)) {
113: &Apache::lonxml::debug("Have $#whichopt max is $max");
114: my $aopt;
115: # if (&Apache::response::showallfoils()) {
116: # $aopt=0;
117: # } else {
118: $aopt=int(&Math::Random::random_uniform() * ($#names+1));
119: # }
120: &Apache::lonxml::debug("From $#names elms, picking $aopt");
121: $aopt=splice(@names,$aopt,1);
122: &Apache::lonxml::debug("Picked $aopt");
123: push (@whichopt,$aopt);
124: }
125: return @whichopt;
126: }
127:
128: sub prep_image {
129: my ($image,$mode,$name)=@_;
130: my $part=$Apache::inputtags::part;
131: my $respid=$Apache::inputtags::response['-1'];
132: my $id=&Apache::loncommon::get_cgi_id();
133: my (%x,$i);
134: $x{"cgi.$id.BGIMG"}=&Apache::lonnet::escape($image);
135: my ($x,$y)=split(/:/,$Apache::lonhomework::history{"resource.$part.$respid.submission"});
136: #draws 2 xs on the image at the clicked location
137: #one in white and then one in red on top of the one in white
138: if (defined($x) && $x =~/\S/
139: && defined($y) && $y =~/\S/
140: && !&Apache::response::show_answer()
141: && $mode ne 'answeronly') {
142: my $length = 6;
143: my $width = 1;
144: my $extrawidth = 2;
145: my $xmin=($x-$length);
146: my $xmax=($x+$length);
147: my $ymin=($y-$length);
148: my $ymax=($y+$length);
149:
150: $x{"cgi.$id.OBJTYPE"}.='LINE:';
151: $i=$x{"cgi.$id.OBJCOUNT"}++;
152: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymin),($xmax),($ymax),
153: "FFFFFF",($width+$extrawidth)));
154: $x{"cgi.$id.OBJTYPE"}.='LINE:';
155: $i=$x{"cgi.$id.OBJCOUNT"}++;
156: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymax),($xmax),($ymin),
157: "FFFFFF",($width+$extrawidth)));
158: $x{"cgi.$id.OBJTYPE"}.='LINE:';
159: $i=$x{"cgi.$id.OBJCOUNT"}++;
160: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymin),($xmax),($ymax),
161: "FF0000",($width)));
162: $x{"cgi.$id.OBJTYPE"}.='LINE:';
163: $i=$x{"cgi.$id.OBJCOUNT"}++;
164: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymax),($xmax),($ymin),
165: "FF0000",($width)));
166: }
167: if ($mode eq 'answer' || $mode eq 'answeronly') {
168: my $width = 1;
169: my $extrawidth = 2;
170: my @areas = @{ $Apache::response::foilgroup{"$name.area"} };
171: foreach my $area (@areas) {
172: if ($area=~/^rectangle:/) {
173: $x{"cgi.$id.OBJTYPE"}.='RECTANGLE:';
174: $i=$x{"cgi.$id.OBJCOUNT"}++;
175: my ($x1,$y1,$x2,$y2)=
176: ($area=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/);
177: $x{"cgi.$id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,"FFFFFF",
178: ($width+$extrawidth)));
179: $x{"cgi.$id.OBJTYPE"}.='RECTANGLE:';
180: $i=$x{"cgi.$id.OBJCOUNT"}++;
181: $x{"cgi.$id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,"00FF00",$width));
182: } elsif ($area=~/^polygon:(.*)/) {
183: $x{"cgi.$id.OBJTYPE"}.='POLYGON:';
184: $i=$x{"cgi.$id.OBJCOUNT"}++;
185: $x{"cgi.$id.OBJ$i"}=join(':',("FFFFFF",($width+$extrawidth)));
186: $x{"cgi.$id.OBJEXTRA$i"}=$1;
187: $x{"cgi.$id.OBJTYPE"}.='POLYGON:';
188: $i=$x{"cgi.$id.OBJCOUNT"}++;
189: $x{"cgi.$id.OBJ$i"}=join(':',("00FF00",$width));
190: $x{"cgi.$id.OBJEXTRA$i"}=$1;
191: }
192: }
193: }
194: &Apache::lonnet::appenv(%x);
195: return $id;
196: }
197:
198: sub displayfoils {
199: my ($target,@whichopt) = @_;
200: my $result ='';
201: my $name;
202: my $temp=1;
203: foreach $name (@whichopt) {
204: $result.=$Apache::response::foilgroup{"$name.text"};
205: &Apache::lonxml::debug("Text is $result");
206: if ($target eq 'tex') {$result.="\\vskip 0 mm \n";} else {$result.="<br />\n";}
207: my $image=$Apache::response::foilgroup{"$name.image"};
208: &Apache::lonxml::debug("image is $image");
209: if ( $target eq 'web' && $image !~ /^http:/ ) {
210: $image=&clean_up_image($image);
211: }
212: &Apache::lonxml::debug("image is $image");
213: if ( &Apache::response::show_answer() ) {
214: if ($target eq 'tex') {
215: $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";
216: } else {
217: my $token=&prep_image($image,'answer',$name);
218: $result.="<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n";
219: }
220: } else {
221: if ($target eq 'tex') {
222: $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";
223: } else {
224: my $id=$Apache::inputtags::response['-1'];
225: my $token=&prep_image($image);
226: my $temp=1;
227: $result.="<input type=\"image\" name=\"HWVAL_$id:$temp\" ".
228: "src=\"/adm/randomlabel.png?token=$token\" /><br />\n";
229: }
230: }
231: $temp++;
232: }
233: return $result;
234: }
235:
236: sub display_answers {
237: my ($target,$whichopt)=@_;
238:
239: my $result;
240: foreach my $name (@$whichopt) {
241: my $image=$Apache::response::foilgroup{"$name.image"};
242: &Apache::lonxml::debug("image is $image");
243: if ( $target eq 'web' && $image !~ /^http:/ ) {
244: $image = &clean_up_image($image);
245: }
246: my $token=&prep_image($image,'answeronly',$name);
247:
248: $result.=&Apache::response::answer_header('imageresponse');
249: $result.=&Apache::response::answer_part('imageresponse',"<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n");
250: $result.=&Apache::response::answer_footer('imageresponse');
251: }
252: return $result;
253: }
254:
255: sub clean_up_image {
256: my ($image)=@_;
257: if ($image =~ /\s*<img\s*/) {
258: ($image) = ($image =~ /src\s*=\s*[\"\']([^\"\']+)[\"\']/i);
259: if ($image !~ /^http:/) {
260: $image=&Apache::lonnet::hreflocation('',$image);
261: }
262: if (!$image) {
263: $image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif';
264: }
265: } else {
266: $image=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$image);
267: &Apache::lonxml::debug("repcopying: $image");
268: if (&Apache::lonnet::repcopy($image) ne 'ok') {
269: $image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif';
270: }
271: }
272: return $image;
273: }
274:
275: sub gradefoils {
276: my (@whichopt) = @_;
277:
278: my $partid = $Apache::inputtags::part;
279: my $id = $Apache::inputtags::response['-1'];
280:
281: if ($Apache::lonhomework::type eq 'exam') {
282: &Apache::response::scored_response($partid,$id);
283: return;
284: }
285:
286: my $x;
287: my $y;
288: my $result;
289: my $temp=1;
290: foreach my $name (@whichopt) {
291: $x=$env{"form.HWVAL_$id:$temp.x"};
292: $y=$env{"form.HWVAL_$id:$temp.y"};
293: &Apache::lonxml::debug("Got a x of $x and a y of $y for $name");
294: if (defined($x) && defined($y) &&
295: defined(@{ $Apache::response::foilgroup{"$name.area"} })) {
296: my @areas = @{ $Apache::response::foilgroup{"$name.area"} };
297: my $grade="INCORRECT";
298: foreach my $area (@areas) {
299: &Apache::lonxml::debug("Area is $area for $name");
300: $area =~ m/([a-z]*):/;
301: &Apache::lonxml::debug("Area of type $1");
302: if ($1 eq 'rectangle') {
303: $grade=&grade_rectangle($area,$x,$y);
304: } elsif ($1 eq 'polygon') {
305: $grade=&grade_polygon($area,$x,$y);
306: } else {
307: &Apache::lonxml::error("Unknown area style $area");
308: }
309: &Apache::lonxml::debug("Area said $grade");
310: if ($grade eq 'APPROX_ANS') { last; }
311: }
312: &Apache::lonxml::debug("Foil was $grade");
313: if ($grade eq 'INCORRECT') { $result= 'INCORRECT'; }
314: if (($grade eq 'APPROX_ANS') && ($result ne 'APPROX_ANS')) { $result=$grade; }
315: &Apache::lonxml::debug("Question is $result");
316: $temp++;
317: }
318: }
319: my $responsestr="$x:$y";
320: my $part=$Apache::inputtags::part;
321: my %previous=&Apache::response::check_for_previous($responsestr,$part,$id);
322: if ($result
323: && $Apache::lonhomework::type eq 'survey') { $result='SUBMITTED'; }
324: &Apache::response::handle_previous(\%previous,$result);
325: $Apache::lonhomework::results{"resource.$part.$id.submission"}=$responsestr;
326: $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$result;
327: return;
328: }
329:
330: sub end_foilgroup {
331: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
332: my $result='';
333: my @whichopt;
334:
335: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
336: $target eq 'analyze' || $target eq 'answer') {
337:
338: my ($count,$max) = &getfoilcounts($parstack,$safeeval);
339: if ($count>$max) { $count=$max }
340: &Apache::lonxml::debug("Count is $count from $max");
341:
342: @whichopt = &whichfoils($max);
343:
344: if ($target eq 'web' || $target eq 'tex') {
345: $result=&displayfoils($target,@whichopt);
346: } elsif ($target eq 'grade') {
347: if ( defined $env{'form.submitted'}) { &gradefoils(@whichopt); }
348: } elsif ( $target eq 'analyze') {
349: &Apache::response::analyze_store_foilgroup(\@whichopt,
350: ['text','image','area']);
351: } elsif ($target eq 'answer'
352: && $env{'form.answer_output_mode'} ne 'tex') {
353: $result=&display_answers($target,\@whichopt);
354: }
355:
356: } elsif ($target eq 'edit') {
357: $result=&Apache::edit::end_table();
358: }
359: &Apache::response::poprandomnumber();
360: return $result;
361: }
362:
363: sub start_conceptgroup {
364: $Apache::imageresponse::conceptgroup=1;
365: %Apache::response::conceptgroup=();
366: return '';
367: }
368:
369: sub end_conceptgroup {
370: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
371: $Apache::imageresponse::conceptgroup=0;
372: my $result;
373: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
374: $target eq 'analyze') {
375: &Apache::response::pick_foil_for_concept($target,
376: ['area','text','image'],
377: \%Apache::hint::image,
378: $parstack,$safeeval);
379: } elsif ($target eq 'edit') {
380: $result=&Apache::edit::end_table();
381: }
382: return $result;
383: }
384:
385: sub insert_foil {
386: return '
387: <foil>
388: <image></image>
389: <text></text>
390: <rectangle></rectangle>
391: </foil>
392: ';
393: }
394:
395: $Apache::imageresponse::curname='';
396: sub start_foil {
397: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
398: my $result;
399: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
400: $target eq 'analyze' || $target eq 'answer') {
401: my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
402: if ($name eq "") {
403: &Apache::lonxml::warning("Foils without names exist. This can cause problems to malfunction.");
404: $name=$Apache::lonxml::curdepth;
405: }
406: if (defined($Apache::response::foilnames{$name})) {
407: &Apache::lonxml::error(&mt("Foil name <b><tt>[_1]</tt></b> appears more than once. Foil names need to be unique.",$name));
408: }
409: $Apache::response::foilnames{$name}++;
410: if ( $Apache::imageresponse::conceptgroup
411: #&& !&Apache::response::showallfoils()
412: ) {
413: push(@{ $Apache::response::conceptgroup{'names'} }, $name);
414: } else {
415: push(@{ $Apache::response::foilgroup{'names'} }, $name);
416: }
417: $Apache::imageresponse::curname=$name;
418: } elsif ($target eq 'edit') {
419: $result = &Apache::edit::tag_start($target,$token);
420: $result .= &Apache::edit::text_arg('Name:','name',$token);
421: $result .= &Apache::edit::end_row().
422: &Apache::edit::start_spanning_row();
423: } elsif ($target eq 'modified') {
424: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
425: $safeeval,'name');
426: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
427: }
428: return $result;;
429: }
430:
431: sub end_foil {
432: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
433: my $result;
434: if ($target eq 'edit') {
435: $result=&Apache::edit::end_table();
436: }
437: return $result;
438: }
439:
440: sub start_text {
441: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
442: my $result='';
443: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
444: || $target eq 'answer') {
445: &Apache::lonxml::startredirection;
446: } elsif ($target eq 'edit') {
447: my $descr=&Apache::lonxml::get_all_text('/text',$parser,$style);
448: $result=&Apache::edit::tag_start($target,$token,'Task Description').
449: &Apache::edit::editfield($token->[1],$descr,'Text',60,2).
450: &Apache::edit::end_row();
451: } elsif ($target eq "modified") {
452: $result=$token->[4].&Apache::edit::modifiedfield('/text',$parser);
453: }
454: return $result;
455: }
456:
457: sub end_text {
458: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
459: my $result;
460: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
461: || $target eq 'answer') {
462: my $name = $Apache::imageresponse::curname;
463: if ( $Apache::imageresponse::conceptgroup
464: #&& !&Apache::response::showallfoils()
465: ) {
466: $Apache::response::conceptgroup{"$name.text"} = &Apache::lonxml::endredirection;
467: } else {
468: $Apache::response::foilgroup{"$name.text"} = &Apache::lonxml::endredirection;
469: }
470: } elsif ($target eq 'edit') {
471: $result=&Apache::edit::end_table();
472: }
473: return $result;
474: }
475:
476: sub start_image {
477: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
478: my $result='';
479: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
480: || $target eq 'answer') {
481: &Apache::lonxml::startredirection;
482: } elsif ($target eq 'edit') {
483: my $bgimg=&Apache::lonxml::get_all_text('/image',$parser,$style);
484: $Apache::edit::bgimgsrc=$bgimg;
485: $Apache::edit::bgimgsrcdepth=$Apache::lonxml::curdepth;
486:
487: $result=&Apache::edit::tag_start($target,$token,'Clickable Image').
488: &Apache::edit::editline($token->[1],$bgimg,'Image Source File',40);
489: $result.=&Apache::edit::browse(undef,'textnode').' ';
490: $result.=&Apache::edit::search(undef,'textnode').
491: &Apache::edit::end_row();
492: } elsif ($target eq "modified") {
493: $result=$token->[4].&Apache::edit::modifiedfield('/image',$parser);
494: }
495: return $result;
496: }
497:
498: sub end_image {
499: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
500: my $result;
501: my $name = $Apache::imageresponse::curname;
502: if ($target eq 'web' || $target eq 'answer') {
503: my $image = &Apache::lonxml::endredirection();
504: &Apache::lonxml::debug("original image is $image");
505: if ( $Apache::imageresponse::conceptgroup
506: #&& !&Apache::response::showallfoils()
507: ) {
508: $Apache::response::conceptgroup{"$name.image"} = $image;
509: } else {
510: $Apache::response::foilgroup{"$name.image"} = $image;
511: }
512: } elsif ($target eq 'analyze') {
513: my $image = &Apache::lonxml::endredirection();
514: if ( $Apache::imageresponse::conceptgroup
515: #&& !&Apache::response::showallfoils()
516: ) {
517: $Apache::response::conceptgroup{"$name.image"} = $image;
518: } else {
519: $Apache::response::foilgroup{"$name.image"} = $image;
520: }
521: } elsif ($target eq 'edit') {
522: $result=&Apache::edit::end_table();
523: } elsif ($target eq 'tex') {
524: my $src = &Apache::lonxml::endredirection();
525:
526: # There may be all sorts of whitespace on fore and aft:
527:
528: $src =~ s/\s+$//s;
529: $src =~ s/^\s+//s;
530:
531: #
532: # Gnuplot e.g. just generates the latex to put inplace.
533: #
534: my $graphinclude;
535: if ($src =~ /^%DYNAMICIMAGE/) {
536: # This is needed because the newline is not always passed -> tex.
537: # At present we don't care about the sizing info.
538:
539: my ($commentline, $restofstuff) = split(/\n/, $src);
540: $graphinclude = $src;
541: $graphinclude =~ s/^$commentline//;
542: } else {
543: my ($path,$file) = &Apache::londefdef::get_eps_image($src);
544: my ($height_param,$width_param)=
545: &Apache::londefdef::image_size($src,0.3,$parstack,$safeeval);
546: $graphinclude = '\graphicspath{{'.$path.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'}';
547: }
548: $Apache::response::foilgroup{"$name.image"} ='\vskip 0 mm \noindent '.$graphinclude;
549: }
550: return $result;
551: }
552:
553: sub start_rectangle {
554: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
555: my $result='';
556: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
557: $target eq 'analyze' || $target eq 'answer') {
558: &Apache::lonxml::startredirection;
559: } elsif ($target eq 'edit') {
560: my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser,$style);
561: $result=&Apache::edit::tag_start($target,$token,'Rectangle').
562: &Apache::edit::editline($token->[1],$coords,'Coordinate Pairs',40).
563: &Apache::edit::entercoord(undef,'textnode',undef,undef,'box').
564: &Apache::edit::end_row();
565: } elsif ($target eq "modified") {
566: &Apache::edit::deletecoorddata();
567: $result=$token->[4].&Apache::edit::modifiedfield('/rectangle',$parser);
568: }
569: return $result;
570: }
571:
572: sub grade_rectangle {
573: my ($spec,$x,$y) = @_;
574: &Apache::lonxml::debug("Spec is $spec");
575: my ($x1,$y1,$x2,$y2)=($spec=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/);
576: &Apache::lonxml::debug("Point $x1,$y1,$x2,$y2");
577: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
578: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
579: if (($x >= $x1) && ($x <= $x2) && ($y >= $y1) && ($y <= $y2)) {
580: return 'APPROX_ANS';
581: }
582: return 'INCORRECT';
583: }
584:
585: sub end_rectangle {
586: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
587: my $result;
588: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
589: $target eq 'analyze' || $target eq 'answer') {
590: my $name = $Apache::imageresponse::curname;
591: my $area = &Apache::lonxml::endredirection;
592: $area=~s/\s//g;
593: &Apache::lonxml::debug("out is $area for $name");
594: if ( $Apache::imageresponse::conceptgroup
595: #&& !&Apache::response::showallfoils()
596: ) {
597: push @{ $Apache::response::conceptgroup{"$name.area"} },"rectangle:$area";
598: } else {
599: push @{ $Apache::response::foilgroup{"$name.area"} },"rectangle:$area";
600: }
601: } elsif ($target eq 'edit') {
602: $result=&Apache::edit::end_table();
603: }
604: return $result;
605: }
606:
607: sub start_polygon {
608: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
609: my $result='';
610: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
611: $target eq 'analyze' || $target eq 'answer') {
612: &Apache::lonxml::startredirection;
613: } elsif ($target eq 'edit') {
614: my $coords=&Apache::lonxml::get_all_text('/polygon',$parser,$style);
615: $result=&Apache::edit::tag_start($target,$token,'Polygon').
616: &Apache::edit::editline($token->[1],$coords,'Coordinate list',40).
617: &Apache::edit::entercoord(undef,'textnode',undef,undef,'polygon').
618: &Apache::edit::end_row();
619: } elsif ($target eq "modified") {
620: $result=$token->[4].&Apache::edit::modifiedfield('/polygon',$parser);
621: }
622: return $result;
623: }
624:
625: sub grade_polygon {
626: my ($spec,$x,$y) = @_;
627: &Apache::lonxml::debug("Spec is $spec");
628: $spec=~s/^polygon://;
629: my @polygon;
630: foreach my $coord (split('-',$spec)) {
631: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
632: &Apache::lonxml::debug("x $x y $y");
633: push @polygon, {'x'=>$x,'y'=>$y};
634: }
635: #make end point start point
636: push @polygon, $polygon[0];
637: # cribbed from
638: # http://geometryalgorithms.com/Archive/algorithm_0103/algorithm_0103.htm
639: my $crossing = 0; # the crossing number counter
640:
641: # loop through all edges of the polygon
642: for (my $i=0; $i<$#polygon; $i++) { # edge from V[i] to V[i+1]
643: if ((($polygon[$i]->{'y'} <= $y)
644: && ($polygon[$i+1]->{'y'} > $y)) # an upward crossing
645: ||
646: (($polygon[$i]->{'y'} > $y)
647: && ($polygon[$i+1]->{'y'} <= $y))) { # a downward crossing
648: # compute the actual edge-ray intersect x-coordinate
649: my $vt = ($y - $polygon[$i]->{'y'})
650: / ($polygon[$i+1]->{'y'} - $polygon[$i]->{'y'});
651: if ($x < $polygon[$i]->{'x'} + $vt *
652: ($polygon[$i+1]->{'x'} - $polygon[$i]->{'x'})) { # x<intersect
653: $crossing++; # a valid crossing of y=P.y right of P.x
654: }
655: }
656: }
657:
658: # 0 if even (out), and 1 if odd (in)
659: if ($crossing%2) {
660: return 'APPROX_ANS';
661: } else {
662: return 'INCORRECT';
663: }
664: }
665:
666: sub end_polygon {
667: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
668: my $result;
669: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
670: $target eq 'analyze' || $target eq 'answer') {
671: my $name = $Apache::imageresponse::curname;
672: my $area = &Apache::lonxml::endredirection;
673: $area=~s/\s*//g;
674: &Apache::lonxml::debug("out is $area for $name");
675: if ( $Apache::imageresponse::conceptgroup
676: #&& !&Apache::response::showallfoils()
677: ) {
678: push @{ $Apache::response::conceptgroup{"$name.area"} },"polygon:$area";
679: } else {
680: push @{ $Apache::response::foilgroup{"$name.area"} },"polygon:$area";
681: }
682: } elsif ($target eq 'edit') {
683: $result=&Apache::edit::end_table();
684: }
685: return $result;
686: }
687: 1;
688: __END__
689:
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