1:
2: # The LearningOnline Network with CAPA
3: # image click response style
4: #
5: # $Id: imageresponse.pm,v 1.75 2006/03/09 01:33:57 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: $result=&Apache::inputtags::exam_score_line($target);
75: }
76:
77: undef(%Apache::response::foilnames);
78:
79: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
80: $target eq 'tex' || $target eq 'analyze') {
81: &Apache::lonxml::increment_counter(&Apache::response::repetition());
82: }
83: &Apache::response::end_response();
84:
85: return $result;
86: }
87:
88: %Apache::response::foilgroup=();
89: sub start_foilgroup {
90: %Apache::response::foilgroup=();
91: $Apache::imageresponse::conceptgroup=0;
92: &Apache::response::pushrandomnumber();
93: return '';
94: }
95:
96: sub getfoilcounts {
97: my ($parstack,$safeeval)=@_;
98:
99: my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
100: # +1 since instructors will count from 1
101: my $count = $#{ $Apache::response::foilgroup{'names'} }+1;
102: #if (&Apache::response::showallfoils()) { $max=$count; }
103: return ($count,$max);
104: }
105:
106: sub whichfoils {
107: my ($max)=@_;
108: if (!defined(@{ $Apache::response::foilgroup{'names'} })) { return; }
109: my @names = @{ $Apache::response::foilgroup{'names'} };
110: my @whichopt =();
111: while ((($#whichopt+1) < $max) && ($#names > -1)) {
112: &Apache::lonxml::debug("Have $#whichopt max is $max");
113: my $aopt;
114: # if (&Apache::response::showallfoils()) {
115: # $aopt=0;
116: # } else {
117: $aopt=int(&Math::Random::random_uniform() * ($#names+1));
118: # }
119: &Apache::lonxml::debug("From $#names elms, picking $aopt");
120: $aopt=splice(@names,$aopt,1);
121: &Apache::lonxml::debug("Picked $aopt");
122: push (@whichopt,$aopt);
123: }
124: return @whichopt;
125: }
126:
127: sub prep_image {
128: my ($image,$mode,$name)=@_;
129: my $part=$Apache::inputtags::part;
130: my $respid=$Apache::inputtags::response['-1'];
131: my $id=&Apache::loncommon::get_cgi_id();
132: my (%x,$i);
133: $x{"cgi.$id.BGIMG"}=&Apache::lonnet::escape($image);
134: my ($x,$y)=split(/:/,$Apache::lonhomework::history{"resource.$part.$respid.submission"});
135: #draws 2 xs on the image at the clicked location
136: #one in white and then one in red on top of the one in white
137: if (defined($x) && $x =~/\S/
138: && defined($y) && $y =~/\S/
139: && !&Apache::response::show_answer()
140: && $mode ne 'answeronly') {
141: my $length = 6;
142: my $width = 1;
143: my $extrawidth = 2;
144: my $xmin=($x-$length);
145: my $xmax=($x+$length);
146: my $ymin=($y-$length);
147: my $ymax=($y+$length);
148:
149: $x{"cgi.$id.OBJTYPE"}.='LINE:';
150: $i=$x{"cgi.$id.OBJCOUNT"}++;
151: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymin),($xmax),($ymax),
152: "FFFFFF",($width+$extrawidth)));
153: $x{"cgi.$id.OBJTYPE"}.='LINE:';
154: $i=$x{"cgi.$id.OBJCOUNT"}++;
155: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymax),($xmax),($ymin),
156: "FFFFFF",($width+$extrawidth)));
157: $x{"cgi.$id.OBJTYPE"}.='LINE:';
158: $i=$x{"cgi.$id.OBJCOUNT"}++;
159: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymin),($xmax),($ymax),
160: "FF0000",($width)));
161: $x{"cgi.$id.OBJTYPE"}.='LINE:';
162: $i=$x{"cgi.$id.OBJCOUNT"}++;
163: $x{"cgi.$id.OBJ$i"}=join(':',(($xmin),($ymax),($xmax),($ymin),
164: "FF0000",($width)));
165: }
166: if ($mode eq 'answer' || $mode eq 'answeronly') {
167: my $width = 1;
168: my $extrawidth = 2;
169: my @areas = @{ $Apache::response::foilgroup{"$name.area"} };
170: foreach my $area (@areas) {
171: if ($area=~/^rectangle:/) {
172: $x{"cgi.$id.OBJTYPE"}.='RECTANGLE:';
173: $i=$x{"cgi.$id.OBJCOUNT"}++;
174: my ($x1,$y1,$x2,$y2)=
175: ($area=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/);
176: $x{"cgi.$id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,"FFFFFF",
177: ($width+$extrawidth)));
178: $x{"cgi.$id.OBJTYPE"}.='RECTANGLE:';
179: $i=$x{"cgi.$id.OBJCOUNT"}++;
180: $x{"cgi.$id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,"00FF00",$width));
181: } elsif ($area=~/^polygon:(.*)/) {
182: $x{"cgi.$id.OBJTYPE"}.='POLYGON:';
183: $i=$x{"cgi.$id.OBJCOUNT"}++;
184: $x{"cgi.$id.OBJ$i"}=join(':',("FFFFFF",($width+$extrawidth)));
185: $x{"cgi.$id.OBJEXTRA$i"}=$1;
186: $x{"cgi.$id.OBJTYPE"}.='POLYGON:';
187: $i=$x{"cgi.$id.OBJCOUNT"}++;
188: $x{"cgi.$id.OBJ$i"}=join(':',("00FF00",$width));
189: $x{"cgi.$id.OBJEXTRA$i"}=$1;
190: }
191: }
192: }
193: &Apache::lonnet::appenv(%x);
194: return $id;
195: }
196:
197: sub displayfoils {
198: my ($target,@whichopt) = @_;
199: my $result ='';
200: my $name;
201: my $temp=1;
202: foreach $name (@whichopt) {
203: $result.=$Apache::response::foilgroup{"$name.text"};
204: &Apache::lonxml::debug("Text is $result");
205: if ($target eq 'tex') {$result.="\\vskip 0 mm \n";} else {$result.="<br />\n";}
206: my $image=$Apache::response::foilgroup{"$name.image"};
207: &Apache::lonxml::debug("image is $image");
208: if ( $target eq 'web' && $image !~ /^http:/ ) {
209: $image=&clean_up_image($image);
210: }
211: &Apache::lonxml::debug("image is $image");
212: if ( &Apache::response::show_answer() ) {
213: if ($target eq 'tex') {
214: $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";
215: } else {
216: my $token=&prep_image($image,'answer',$name);
217: $result.="<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n";
218: }
219: } else {
220: if ($target eq 'tex') {
221: $result.=$Apache::response::foilgroup{"$name.image"}."\\vskip 0 mm \n";
222: } else {
223: my $id=$Apache::inputtags::response['-1'];
224: my $token=&prep_image($image);
225: my $temp=1;
226: $result.="<input type=\"image\" name=\"HWVAL_$id:$temp\" ".
227: "src=\"/adm/randomlabel.png?token=$token\" /><br />\n";
228: }
229: }
230: $temp++;
231: }
232: return $result;
233: }
234:
235: sub display_answers {
236: my ($target,$whichopt)=@_;
237:
238: my $result;
239: foreach my $name (@$whichopt) {
240: my $image=$Apache::response::foilgroup{"$name.image"};
241: &Apache::lonxml::debug("image is $image");
242: if ( $target eq 'web' && $image !~ /^http:/ ) {
243: $image = &clean_up_image($image);
244: }
245: my $token=&prep_image($image,'answeronly',$name);
246:
247: $result.=&Apache::response::answer_header('imageresponse');
248: $result.=&Apache::response::answer_part('imageresponse',"<img src=\"/adm/randomlabel.png?token=$token\" /><br />\n");
249: $result.=&Apache::response::answer_footer('imageresponse');
250: }
251: return $result;
252: }
253:
254: sub clean_up_image {
255: my ($image)=@_;
256: if ($image =~ /\s*<img\s*/) {
257: ($image) = ($image =~ /src\s*=\s*[\"\']([^\"\']+)[\"\']/i);
258: if ($image !~ /^http:/) {
259: $image=&Apache::lonnet::hreflocation('',$image);
260: }
261: if (!$image) {
262: $image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif';
263: }
264: } else {
265: $image=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$image);
266: &Apache::lonxml::debug("repcopying: $image");
267: if (&Apache::lonnet::repcopy($image) ne 'ok') {
268: $image='/home/httpd/html/adm/lonKaputt/lonlogo_broken.gif';
269: }
270: }
271: return $image;
272: }
273:
274: sub gradefoils {
275: my (@whichopt) = @_;
276:
277: my $partid = $Apache::inputtags::part;
278: my $id = $Apache::inputtags::response['-1'];
279:
280: if ($Apache::lonhomework::type eq 'exam') {
281: &Apache::response::scored_response($partid,$id);
282: return;
283: }
284:
285: my $x;
286: my $y;
287: my $result;
288: my $temp=1;
289: foreach my $name (@whichopt) {
290: $x=$env{"form.HWVAL_$id:$temp.x"};
291: $y=$env{"form.HWVAL_$id:$temp.y"};
292: &Apache::lonxml::debug("Got a x of $x and a y of $y for $name");
293: if (defined($x) && defined($y) &&
294: defined(@{ $Apache::response::foilgroup{"$name.area"} })) {
295: my @areas = @{ $Apache::response::foilgroup{"$name.area"} };
296: my $grade="INCORRECT";
297: foreach my $area (@areas) {
298: &Apache::lonxml::debug("Area is $area for $name");
299: $area =~ m/([a-z]*):/;
300: &Apache::lonxml::debug("Area of type $1");
301: if ($1 eq 'rectangle') {
302: $grade=&grade_rectangle($area,$x,$y);
303: } elsif ($1 eq 'polygon') {
304: $grade=&grade_polygon($area,$x,$y);
305: } else {
306: &Apache::lonxml::error("Unknown area style $area");
307: }
308: &Apache::lonxml::debug("Area said $grade");
309: if ($grade eq 'APPROX_ANS') { last; }
310: }
311: &Apache::lonxml::debug("Foil was $grade");
312: if ($grade eq 'INCORRECT') { $result= 'INCORRECT'; }
313: if (($grade eq 'APPROX_ANS') && ($result ne 'APPROX_ANS')) { $result=$grade; }
314: &Apache::lonxml::debug("Question is $result");
315: $temp++;
316: }
317: }
318: my $responsestr="$x:$y";
319: my $part=$Apache::inputtags::part;
320: my %previous=&Apache::response::check_for_previous($responsestr,$part,$id);
321: if ($result
322: && $Apache::lonhomework::type eq 'survey') { $result='SUBMITTED'; }
323: &Apache::response::handle_previous(\%previous,$result);
324: $Apache::lonhomework::results{"resource.$part.$id.submission"}=$responsestr;
325: $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$result;
326: return;
327: }
328:
329: sub end_foilgroup {
330: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
331: my $result='';
332: my @whichopt;
333:
334: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
335: $target eq 'analyze' || $target eq 'answer') {
336:
337: my ($count,$max) = &getfoilcounts($parstack,$safeeval);
338: if ($count>$max) { $count=$max }
339: &Apache::lonxml::debug("Count is $count from $max");
340:
341: @whichopt = &whichfoils($max);
342:
343: if ($target eq 'web' || $target eq 'tex') {
344: $result=&displayfoils($target,@whichopt);
345: } elsif ($target eq 'grade') {
346: if ( defined $env{'form.submitted'}) { &gradefoils(@whichopt); }
347: } elsif ( $target eq 'analyze') {
348: &Apache::response::analyze_store_foilgroup(\@whichopt,
349: ['text','image','area']);
350: } elsif ($target eq 'answer') {
351: $result=&display_answers($target,\@whichopt);
352: }
353:
354: } elsif ($target eq 'edit') {
355: $result=&Apache::edit::end_table();
356: }
357: &Apache::response::poprandomnumber();
358: return $result;
359: }
360:
361: sub start_conceptgroup {
362: $Apache::imageresponse::conceptgroup=1;
363: %Apache::response::conceptgroup=();
364: return '';
365: }
366:
367: sub end_conceptgroup {
368: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
369: $Apache::imageresponse::conceptgroup=0;
370: my $result;
371: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
372: $target eq 'analyze') {
373: &Apache::response::pick_foil_for_concept($target,
374: ['area','text','image'],
375: \%Apache::hint::image,
376: $parstack,$safeeval);
377: } elsif ($target eq 'edit') {
378: $result=&Apache::edit::end_table();
379: }
380: return $result;
381: }
382:
383: sub insert_foil {
384: return '
385: <foil>
386: <image></image>
387: <text></text>
388: <rectangle></rectangle>
389: </foil>
390: ';
391: }
392:
393: $Apache::imageresponse::curname='';
394: sub start_foil {
395: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
396: my $result;
397: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
398: $target eq 'analyze' || $target eq 'answer') {
399: my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
400: if ($name eq "") {
401: &Apache::lonxml::warning("Foils without names exist. This can cause problems to malfunction.");
402: $name=$Apache::lonxml::curdepth;
403: }
404: if (defined($Apache::response::foilnames{$name})) {
405: &Apache::lonxml::error(&mt("Foil name <b><tt>[_1]</tt></b> appears more than once. Foil names need to be unique.",$name));
406: }
407: $Apache::response::foilnames{$name}++;
408: if ( $Apache::imageresponse::conceptgroup
409: #&& !&Apache::response::showallfoils()
410: ) {
411: push(@{ $Apache::response::conceptgroup{'names'} }, $name);
412: } else {
413: push(@{ $Apache::response::foilgroup{'names'} }, $name);
414: }
415: $Apache::imageresponse::curname=$name;
416: } elsif ($target eq 'edit') {
417: $result = &Apache::edit::tag_start($target,$token);
418: $result .= &Apache::edit::text_arg('Name:','name',$token);
419: $result .= &Apache::edit::end_row().
420: &Apache::edit::start_spanning_row();
421: } elsif ($target eq 'modified') {
422: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
423: $safeeval,'name');
424: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
425: }
426: return $result;;
427: }
428:
429: sub end_foil {
430: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
431: my $result;
432: if ($target eq 'edit') {
433: $result=&Apache::edit::end_table();
434: }
435: return $result;
436: }
437:
438: sub start_text {
439: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
440: my $result='';
441: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
442: || $target eq 'answer') {
443: &Apache::lonxml::startredirection;
444: } elsif ($target eq 'edit') {
445: my $descr=&Apache::lonxml::get_all_text('/text',$parser,$style);
446: $result=&Apache::edit::tag_start($target,$token,'Task Description').
447: &Apache::edit::editfield($token->[1],$descr,'Text',60,2).
448: &Apache::edit::end_row();
449: } elsif ($target eq "modified") {
450: $result=$token->[4].&Apache::edit::modifiedfield('/text',$parser);
451: }
452: return $result;
453: }
454:
455: sub end_text {
456: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
457: my $result;
458: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
459: || $target eq 'answer') {
460: my $name = $Apache::imageresponse::curname;
461: if ( $Apache::imageresponse::conceptgroup
462: #&& !&Apache::response::showallfoils()
463: ) {
464: $Apache::response::conceptgroup{"$name.text"} = &Apache::lonxml::endredirection;
465: } else {
466: $Apache::response::foilgroup{"$name.text"} = &Apache::lonxml::endredirection;
467: }
468: } elsif ($target eq 'edit') {
469: $result=&Apache::edit::end_table();
470: }
471: return $result;
472: }
473:
474: sub start_image {
475: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
476: my $result='';
477: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze'
478: || $target eq 'answer') {
479: &Apache::lonxml::startredirection;
480: } elsif ($target eq 'edit') {
481: my $bgimg=&Apache::lonxml::get_all_text('/image',$parser,$style);
482: $Apache::edit::bgimgsrc=$bgimg;
483: $Apache::edit::bgimgsrcdepth=$Apache::lonxml::curdepth;
484:
485: $result=&Apache::edit::tag_start($target,$token,'Clickable Image').
486: &Apache::edit::editline($token->[1],$bgimg,'Image Source File',40);
487: $result.=&Apache::edit::browse(undef,'textnode').' ';
488: $result.=&Apache::edit::search(undef,'textnode').
489: &Apache::edit::end_row();
490: } elsif ($target eq "modified") {
491: $result=$token->[4].&Apache::edit::modifiedfield('/image',$parser);
492: }
493: return $result;
494: }
495:
496: sub end_image {
497: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
498: my $result;
499: my $name = $Apache::imageresponse::curname;
500: if ($target eq 'web' || $target eq 'answer') {
501: my $image = &Apache::lonxml::endredirection();
502: &Apache::lonxml::debug("original image is $image");
503: if ( $Apache::imageresponse::conceptgroup
504: #&& !&Apache::response::showallfoils()
505: ) {
506: $Apache::response::conceptgroup{"$name.image"} = $image;
507: } else {
508: $Apache::response::foilgroup{"$name.image"} = $image;
509: }
510: } elsif ($target eq 'analyze') {
511: my $image = &Apache::lonxml::endredirection();
512: if ( $Apache::imageresponse::conceptgroup
513: #&& !&Apache::response::showallfoils()
514: ) {
515: $Apache::response::conceptgroup{"$name.image"} = $image;
516: } else {
517: $Apache::response::foilgroup{"$name.image"} = $image;
518: }
519: } elsif ($target eq 'edit') {
520: $result=&Apache::edit::end_table();
521: } elsif ($target eq 'tex') {
522: my $src = &Apache::lonxml::endredirection();
523:
524: # There may be all sorts of whitespace on fore and aft:
525:
526: $src =~ s/\s+$//s;
527: $src =~ s/^\s+//s;
528:
529: #
530: # Gnuplot e.g. just generates the latex to put inplace.
531: #
532: my $graphinclude;
533: if ($src =~ /^%DYNAMICIMAGE/) {
534: # This is needed because the newline is not always passed -> tex.
535: # At present we don't care about the sizing info.
536:
537: my ($commentline, $restofstuff) = split(/\n/, $src);
538: $graphinclude = $src;
539: $graphinclude =~ s/^$commentline//;
540: } else {
541: my ($path,$file) = &Apache::londefdef::get_eps_image($src);
542: my ($height_param,$width_param)=
543: &Apache::londefdef::image_size($src,0.3,$parstack,$safeeval);
544: $graphinclude = '\graphicspath{{'.$path.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'}';
545: }
546: $Apache::response::foilgroup{"$name.image"} ='\vskip 0 mm \noindent '.$graphinclude;
547: }
548: return $result;
549: }
550:
551: sub start_rectangle {
552: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
553: my $result='';
554: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
555: $target eq 'analyze' || $target eq 'answer') {
556: &Apache::lonxml::startredirection;
557: } elsif ($target eq 'edit') {
558: my $coords=&Apache::lonxml::get_all_text('/rectangle',$parser,$style);
559: $result=&Apache::edit::tag_start($target,$token,'Rectangle').
560: &Apache::edit::editline($token->[1],$coords,'Coordinate Pairs',40).
561: &Apache::edit::entercoord(undef,'textnode',undef,undef,'box').
562: &Apache::edit::end_row();
563: } elsif ($target eq "modified") {
564: &Apache::edit::deletecoorddata();
565: $result=$token->[4].&Apache::edit::modifiedfield('/rectangle',$parser);
566: }
567: return $result;
568: }
569:
570: sub grade_rectangle {
571: my ($spec,$x,$y) = @_;
572: &Apache::lonxml::debug("Spec is $spec");
573: my ($x1,$y1,$x2,$y2)=($spec=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/);
574: &Apache::lonxml::debug("Point $x1,$y1,$x2,$y2");
575: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
576: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
577: if (($x >= $x1) && ($x <= $x2) && ($y >= $y1) && ($y <= $y2)) {
578: return 'APPROX_ANS';
579: }
580: return 'INCORRECT';
581: }
582:
583: sub end_rectangle {
584: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
585: my $result;
586: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
587: $target eq 'analyze' || $target eq 'answer') {
588: my $name = $Apache::imageresponse::curname;
589: my $area = &Apache::lonxml::endredirection;
590: $area=~s/\s//g;
591: &Apache::lonxml::debug("out is $area for $name");
592: if ( $Apache::imageresponse::conceptgroup
593: #&& !&Apache::response::showallfoils()
594: ) {
595: push @{ $Apache::response::conceptgroup{"$name.area"} },"rectangle:$area";
596: } else {
597: push @{ $Apache::response::foilgroup{"$name.area"} },"rectangle:$area";
598: }
599: } elsif ($target eq 'edit') {
600: $result=&Apache::edit::end_table();
601: }
602: return $result;
603: }
604:
605: sub start_polygon {
606: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
607: my $result='';
608: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
609: $target eq 'analyze' || $target eq 'answer') {
610: &Apache::lonxml::startredirection;
611: } elsif ($target eq 'edit') {
612: my $coords=&Apache::lonxml::get_all_text('/polygon',$parser,$style);
613: $result=&Apache::edit::tag_start($target,$token,'Polygon').
614: &Apache::edit::editline($token->[1],$coords,'Coordinate list',40).
615: &Apache::edit::entercoord(undef,'textnode',undef,undef,'polygon').
616: &Apache::edit::end_row();
617: } elsif ($target eq "modified") {
618: $result=$token->[4].&Apache::edit::modifiedfield('/polygon',$parser);
619: }
620: return $result;
621: }
622:
623: sub grade_polygon {
624: my ($spec,$x,$y) = @_;
625: &Apache::lonxml::debug("Spec is $spec");
626: $spec=~s/^polygon://;
627: my @polygon;
628: foreach my $coord (split('-',$spec)) {
629: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
630: &Apache::lonxml::debug("x $x y $y");
631: push @polygon, {'x'=>$x,'y'=>$y};
632: }
633: #make end point start point
634: push @polygon, $polygon[0];
635: # cribbed from
636: # http://geometryalgorithms.com/Archive/algorithm_0103/algorithm_0103.htm
637: my $crossing = 0; # the crossing number counter
638:
639: # loop through all edges of the polygon
640: for (my $i=0; $i<$#polygon; $i++) { # edge from V[i] to V[i+1]
641: if ((($polygon[$i]->{'y'} <= $y)
642: && ($polygon[$i+1]->{'y'} > $y)) # an upward crossing
643: ||
644: (($polygon[$i]->{'y'} > $y)
645: && ($polygon[$i+1]->{'y'} <= $y))) { # a downward crossing
646: # compute the actual edge-ray intersect x-coordinate
647: my $vt = ($y - $polygon[$i]->{'y'})
648: / ($polygon[$i+1]->{'y'} - $polygon[$i]->{'y'});
649: if ($x < $polygon[$i]->{'x'} + $vt *
650: ($polygon[$i+1]->{'x'} - $polygon[$i]->{'x'})) { # x<intersect
651: $crossing++; # a valid crossing of y=P.y right of P.x
652: }
653: }
654: }
655:
656: # 0 if even (out), and 1 if odd (in)
657: if ($crossing%2) {
658: return 'APPROX_ANS';
659: } else {
660: return 'INCORRECT';
661: }
662: }
663:
664: sub end_polygon {
665: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
666: my $result;
667: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex' ||
668: $target eq 'analyze' || $target eq 'answer') {
669: my $name = $Apache::imageresponse::curname;
670: my $area = &Apache::lonxml::endredirection;
671: $area=~s/\s*//g;
672: &Apache::lonxml::debug("out is $area for $name");
673: if ( $Apache::imageresponse::conceptgroup
674: #&& !&Apache::response::showallfoils()
675: ) {
676: push @{ $Apache::response::conceptgroup{"$name.area"} },"polygon:$area";
677: } else {
678: push @{ $Apache::response::foilgroup{"$name.area"} },"polygon:$area";
679: }
680: } elsif ($target eq 'edit') {
681: $result=&Apache::edit::end_table();
682: }
683: return $result;
684: }
685: 1;
686: __END__
687:
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