1: # The LearningOnline Network with CAPA
2: # Quick Student Grades Display
3: #
4: # $Id: lonquickgrades.pm,v 1.49.6.8.2.4 2023/10/06 20:36:59 raeburn Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28:
29: package Apache::lonquickgrades;
30:
31: use strict;
32: use Apache::Constants qw(:common :http REDIRECT);
33: use POSIX;
34: use Apache::loncommon;
35: use Apache::lonlocal;
36: use Apache::lonnet;
37: use Apache::grades;
38: use Apache::lonuserstate;
39:
40: sub handler {
41: my $r = shift;
42: return real_handler($r);
43: }
44:
45: sub real_handler {
46: my $r = shift;
47:
48: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
49:
50: # Handle header-only request
51: if ($env{'browser.mathml'}) {
52: &Apache::loncommon::content_type($r,'text/xml');
53: } else {
54: &Apache::loncommon::content_type($r,'text/html');
55: }
56: if ($r->header_only) {
57: $r->send_http_header;
58: return OK;
59: }
60:
61: my $cangrade=&Apache::lonnet::allowed('mgr');
62: my $showPoints =
63: $env{'course.'.$env{'request.course.id'}.'.grading'} eq 'standard';
64:
65: my $reinitresult;
66:
67: if ($env{'request.course.id'}) {
68: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
69: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
70: my $clientip = &Apache::lonnet::get_requestor_ip($r);
71: my ($blocked,$blocktext) =
72: &Apache::loncommon::blocking_status('grades',$clientip,$cnum,$cdom);
73: if ($blocked) {
74: my $checkrole = "cm./$cdom/$cnum";
75: if ($env{'request.course.sec'} ne '') {
76: $checkrole .= "/$env{'request.course.sec'}";
77: }
78: unless ((&Apache::lonnet::allowed('evb',undef,undef,$checkrole)) &&
79: ($env{'request.role'} !~ m{^st\./$cdom/$cnum})) {
80: &grades_blocked($r,$blocktext,$showPoints);
81: return OK;
82: }
83: }
84: }
85:
86: unless ($cangrade) {
87: # Check for critical messages and redirect if present.
88: my ($redirect,$url) = &Apache::loncommon::critical_redirect(300,'grades');
89: if ($redirect) {
90: &Apache::loncommon::content_type($r,'text/html');
91: $r->header_out(Location => $url);
92: return REDIRECT;
93: }
94:
95: # Check if course needs to be re-initialized
96: my $loncaparev = $r->dir_config('lonVersion');
97: ($reinitresult,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
98:
99: if ($reinitresult eq 'switch') {
100: &Apache::loncommon::content_type($r,'text/html');
101: $r->send_http_header;
102: $r->print(&Apache::loncommon::check_release_result(@reinit));
103: return OK;
104: }
105: my ($cid,$cnum,$cdom);
106: if ($reinitresult) {
107: $cid = $env{'request.course.id'};
108: $cnum = $env{'course.'.$cid.'.num'};
109: $cdom = $env{'course.'.$cid.'.domain'};
110: }
111: if (($reinitresult eq 'main') || ($reinitresult eq 'both')) {
112: &Apache::loncommon::content_type($r,'text/html');
113: $r->send_http_header;
114: &startpage($r,$showPoints);
115: my $preamble = '<div id="LC_update_'.$cid.'" class="LC_info">'.
116: '<br />'.
117: &mt('Your course session is being updated because of recent changes by course personnel.').
118: ' '.&mt('Please be patient').'.<br /></div>'.
119: '<div style="padding:0;clear:both;margin:0;border:0"></div>';
120: my %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
121: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
122: $r->rflush();
123: my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
124: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished!'));
125: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
126: my $closure = <<ENDCLOSE;
127: <script type="text/javascript">
128: // <![CDATA[
129: \$("#LC_update_$cid").hide('slow');
130: // ]]>
131: </script>
132: ENDCLOSE
133: if ($ferr) {
134: $r->print($closure.&Apache::loncommon::end_page());
135: my $requrl = $r->uri;
136: $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
137: $env{'user.reinit'} = 1;
138: return HTTP_NOT_ACCEPTABLE;
139: } else {
140: $r->print($closure);
141: }
142: }
143: if (($reinitresult eq 'supp') || ($reinitresult eq 'both')) {
144: my $possdel;
145: if ($reinitresult eq 'supp') {
146: $possdel = 1;
147: }
148: my ($supplemental,$refs_updated) = &Apache::loncommon::get_supplemental($cnum,$cdom,'',$possdel);
149: unless ($refs_updated) {
150: &Apache::loncommon::set_supp_httprefs($cnum,$cdom,$supplemental);
151: }
152: }
153: }
154:
155: unless (($reinitresult eq 'main') || ($reinitresult eq 'both')) {
156: # Send header, don't cache this page
157: &Apache::loncommon::no_cache($r);
158: $r->send_http_header;
159: &startpage($r,$showPoints);
160: }
161: $r->rflush();
162:
163: &startGradeScreen($r);
164:
165: #
166: # Pick student
167: #
168: my $uname;
169: my $udom;
170: my $stdid;
171: if ($cangrade) {
172: if ($env{'form.uname'}) { $uname=$env{'form.uname'}; }
173: if ($env{'form.udom'}) { $udom=$env{'form.udom'}; }
174: if ($env{'form.id'}) { $stdid=$env{'form.id'}; }
175: if (($stdid) && ($udom)) {
176: $uname=(&Apache::lonnet::idget($udom,[$stdid],'ids'))[1];
177: }
178: if (($stdid) && (!$uname)) {
179: $r->print('<p><span class="LC_warning">'.&mt("Unknown Student/Employee ID: [_1]",$stdid).'</span></p>');
180: $stdid='';
181: }
182: if (($uname eq '') && ($udom eq '')) {
183: $uname = $env{'user.name'};
184: $udom = $env{'user.domain'};
185: }
186: $r->print('<form method="post" name="quickform" action="/adm/quickgrades">');
187: my $chooseopt=&Apache::loncommon::select_dom_form($udom,'udom').' '.
188: &Apache::loncommon::selectstudent_link('quickform','uname','udom');
189: $r->print("<p>\n".&Apache::loncommon::studentbrowser_javascript()."\n");
190: $r->print(&mt('For User [_1] or Student/Employee ID [_2] at Domain [_3]'
191: ,'<input type="text" value="'.$uname.'" size="12" name="uname" />'
192: ,'<input type="text" value="'.$stdid.'" size="12" name="id" /> '
193: ,$chooseopt).
194: ' <input type="submit" name="display" value="'.&mt('Display Individual Student').'" /></p>');
195: if (($uname) && ($udom)) {
196: $r->print('<p>'.&mt('Full Name: [_1]',&Apache::loncommon::plainname($uname,$udom)).'</p>');
197: }
198: } else {
199: $r->print('<p class="LC_info">'.&mt('This may take a few moments to display.').'</p>');
200: }
201: $r->rflush();
202:
203: my $notshowTotals=
204: $env{'course.'.$env{'request.course.id'}.'.grading'} eq 'externalnototals';
205:
206: my ($navmap,$totalParts,$totalPossible,$totalRight,$totalAttempted,$topLevelParts,
207: $topLevelRight,$topLevelAttempted) = &getData($showPoints,$uname,$udom);
208:
209: if (ref($navmap)) {
210: my $nostdtotals;
211: if ($showPoints) {
212: if ($env{'course.'.$env{'request.course.id'}.'.grading'} eq 'standard') {
213: my $hidetotals = $env{'course.'.$env{'request.course.id'}.'.hidetotals'};
214: if ($hidetotals eq 'all') {
215: $nostdtotals = 1;
216: } elsif ($hidetotals ne '') {
217: my $usec;
218: if (($uname eq $env{'user.name'}) && ($env{'user.domain'})) {
219: $usec = $env{'request.user.section'};
220: } elsif ($cangrade) {
221: $usec = &Apache::lonnet::getsection($udom,$uname,$env{'request.course.id'});
222: }
223: if ($usec ne '') {
224: my %secnototals;
225: map { $secnototals{$_} = 1; } split(/,/,$hidetotals);
226: if ($secnototals{$usec}) {
227: $nostdtotals = 1;
228: }
229: }
230: }
231: }
232: }
233: &outputTable($r,$showPoints,$notshowTotals,$nostdtotals,$navmap,
234: $totalParts,$totalPossible,$totalRight,$totalAttempted,
235: $topLevelParts,$topLevelRight,$topLevelAttempted);
236: } else {
237: if ($cangrade) { $r->print("\n</form>\n"); }
238: my $requrl = $r->uri;
239: $env{'user.error.msg'} = "$requrl:bre:0:0:Navmap initialization failed.";
240: return HTTP_NOT_ACCEPTABLE;
241: }
242: if ($cangrade) { $r->print("\n</form>\n"); }
243: &endGradeScreen($r);
244: return OK;
245: }
246:
247: sub grades_blocked {
248: my ($r,$blocktext,$caller) = @_;
249: my $title = 'Points Display';
250: if ($caller eq 'spreadsheet') {
251: $title = 'Spreadsheet';
252: } elsif ($env{'course.'.$env{'request.course.id'}.'.grading'} ne 'standard') {
253: $title = 'Completed Problems Display';
254: }
255: my $brcrum = [{href=>"/adm/quickgrades",text => $title}];
256: &Apache::lonhtmlcommon::clear_breadcrumbs();
257: &Apache::lonhtmlcommon::add_breadcrumb({href=>'/adm/quickgrades',
258: text=> $title});
259: my $breadcrumbs = &Apache::lonhtmlcommon::breadcrumbs($title);
260: &Apache::loncommon::content_type($r,'text/html');
261: &Apache::loncommon::no_cache($r);
262: $r->send_http_header;
263: $r->print(&Apache::loncommon::start_page($title).
264: $breadcrumbs.
265: $blocktext.
266: &Apache::loncommon::end_page());
267: return;
268: }
269:
270: #
271: # Go through the complete course and collect data
272: #
273:
274: sub getData {
275:
276: my ($showPoints,$uname,$udom)=@_;
277:
278: # Create the nav map
279: my $navmap = Apache::lonnavmaps::navmap->new($uname,$udom);
280:
281: if (!defined($navmap)) {
282: return ();
283: }
284:
285: my $res = $navmap->firstResource(); # temp resource to access constants
286:
287: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
288: my $depth = 1;
289: $iterator->next(); # ignore first BEGIN_MAP
290: my $curRes = $iterator->next();
291:
292: # General overview of the following: Walk along the course resources.
293: # For every problem in the resource, tell its parent maps how many
294: # parts and how many parts correct it has. After that, each map will
295: # have a count of the total parts underneath it, correct and otherwise.
296: # After that, we will walk through the course again and read off
297: # maps in order, with their data.
298: # (If in the future people decide not to be cumulative, only add
299: # the counts to the parent map.)
300: # For convenience, "totalParts" is also "totalPoints" when we're looking
301: # at points; I can't come up with a variable name that makes sense
302: # equally for both cases.
303:
304: my $totalParts = 0; my $totalPossible = 0; my $totalRight = 0;
305: my $totalAttempted = 0;
306: my $now = time();
307: my $topLevelParts = 0; my $topLevelRight = 0; my $topLevelAttempted = 0;
308:
309: # Pre-run: Count parts correct
310: while ( $depth > 0 ) {
311: if ($curRes == $iterator->BEGIN_MAP()) {$depth++;}
312: if ($curRes == $iterator->END_MAP()) { $depth--; }
313:
314: if (ref($curRes) && $curRes->is_gradable() && !$curRes->randomout)
315: {
316: # Get number of correct, incorrect parts
317: my $parts = $curRes->parts();
318: my $partsRight = 0;
319: my $partsCount = 0;
320: my $partsAttempted = 0;
321: my $stack = $iterator->getStack();
322:
323: for my $part (@{$parts}) {
324: my $dateStatus = $curRes->getDateStatus($part);
325: my $weight = $curRes->weight($part);
326: my $problemstatus = $curRes->problemstatus($part);
327:
328: if ($curRes->solved($part) eq 'excused') {
329: next;
330: }
331: if ($showPoints) {
332: my $score = 0;
333: # If we're not telling status and the answer date isn't passed yet,
334: # it's an "attempted" point
335: if ((($problemstatus eq 'no') ||
336: ($problemstatus eq 'no_feedback_ever')) &&
337: ($dateStatus != $curRes->ANSWER_OPEN)) {
338: my $status = $curRes->simpleStatus($part);
339: if ($status == $curRes->ATTEMPTED) {
340: $partsAttempted += $weight;
341: $totalAttempted += $partsAttempted;
342: }
343: } else {
344: $score = &Apache::grades::compute_points($weight, $curRes->awarded($part));
345: }
346: $partsRight += $score;
347: $totalRight += $score;
348: $partsCount += $weight;
349:
350: if ($curRes->opendate($part) < $now) {
351: $totalPossible += $weight;
352: }
353: $totalParts += $weight;
354: } else {
355: my $status = $curRes->simpleStatus($part);
356: my $thisright = 0;
357: $partsCount++;
358: if ($status == $curRes->CORRECT ||
359: $status == $curRes->PARTIALLY_CORRECT ) {
360: $partsRight++;
361: $totalRight++;
362: $thisright = 1;
363: }
364:
365: if ($status == $curRes->ATTEMPTED) {
366: $partsAttempted++;
367: $totalAttempted++;
368: }
369:
370: $totalParts++;
371: if ($curRes->opendate($part) < $now) {
372: $totalPossible++;
373: }
374: }
375: }
376:
377: if ($depth == 1) { # in top-level only
378: $topLevelParts += $partsCount;
379: $topLevelRight += $partsRight;
380: $topLevelAttempted += $partsAttempted;
381: }
382:
383: # Crawl down stack and record parts correct and total
384: for my $res (@{$stack}) {
385: if (ref($res) && $res->is_map()) {
386: if (!defined($res->{DATA}->{CHILD_PARTS})) {
387: $res->{DATA}->{CHILD_PARTS} = 0;
388: $res->{DATA}->{CHILD_CORRECT} = 0;
389: $res->{DATA}->{CHILD_ATTEMPTED} = 0;
390: }
391:
392: $res->{DATA}->{CHILD_PARTS} += $partsCount;
393: $res->{DATA}->{CHILD_CORRECT} += $partsRight;
394: $res->{DATA}->{CHILD_ATTEMPTED} += $partsAttempted;
395: }
396: }
397: }
398: $curRes = $iterator->next();
399: }
400: return ($navmap,$totalParts,$totalPossible,$totalRight,$totalAttempted,
401: $topLevelParts,$topLevelRight,$topLevelAttempted);
402: }
403:
404: #
405: # Outputting everything.
406: #
407:
408: sub outputTable {
409:
410: my ($r,$showPoints,$notshowTotals,$nostdtotals,$navmap,$totalParts,$totalPossible,
411: $totalRight,$totalAttempted,$topLevelParts,$topLevelRight,$topLevelAttempted)=@_;
412:
413: my @start = (255, 255, 192);
414: my @end = (0, 192, 0);
415:
416: my $indentString = ' ';
417:
418: # Second pass: Print the maps.
419: $r->print(&Apache::loncommon::start_data_table()
420: .&Apache::loncommon::start_data_table_header_row()
421: .'<th>'.&mt('Folder').'</th>');
422: my $title = &mt($showPoints ? "Points Scored" : "Done");
423: if ($totalAttempted) {
424: $title .= " / " . &mt("Attempted");
425: }
426: $r->print("<th>$title".($notshowTotals?'':" / ".&mt('Total')).'</th>'
427: .&Apache::loncommon::end_data_table_header_row());
428: #
429: # Output of folder scores
430: #
431:
432: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
433: my $depth = 1;
434: $iterator->next(); # ignore first BEGIN_MAP
435: my $curRes = $iterator->next();
436:
437: while ($depth > 0) {
438: if ($curRes == $iterator->BEGIN_MAP()) {$depth++;}
439: if ($curRes == $iterator->END_MAP()) { $depth--; }
440:
441: if (ref($curRes) && $curRes->is_map()) {
442: my $title = $curRes->compTitle();
443:
444: my $correct = $curRes->{DATA}->{CHILD_CORRECT};
445: my $total = $curRes->{DATA}->{CHILD_PARTS};
446: my $attempted = $curRes->{DATA}->{CHILD_ATTEMPTED};
447:
448: if ($total > 0) {
449: my $ratio;
450: $ratio = $correct / $total;
451: my $color = &mixColors(\@start, \@end, $ratio);
452: $r->print(&Apache::loncommon::start_data_table_row()
453: .'<td style="background-color:'.$color.';">');
454:
455: my $thisIndent = '';
456: for (my $i = 1; $i < $depth; $i++) { $thisIndent .= $indentString; }
457:
458: $r->print("$thisIndent$title</td>");
459: if ($totalAttempted) {
460: $r->print('<td valign="top">'
461: .$thisIndent
462: .'<span class="LC_nobreak">'
463: .$correct.' / '.$attempted.($notshowTotals?'':' / '.$total)
464: .'</span></td>'
465: .&Apache::loncommon::end_data_table_row()
466: );
467: } else {
468: $r->print('<td valign="top">'
469: .$thisIndent
470: .'<span class="LC_nobreak">'
471: .$correct.($notshowTotals?'':' / '.$total)
472: .'</span></td>'
473: .&Apache::loncommon::end_data_table_row());
474: }
475: }
476: }
477:
478: $curRes = $iterator->next();
479: }
480:
481: # If there were any problems at the top level, print an extra "catchall"
482: if ($topLevelParts > 0) {
483: my $ratio = $topLevelRight / $topLevelParts;
484: my $color = &mixColors(\@start, \@end, $ratio);
485: $r->print(&Apache::loncommon::start_data_table_row()
486: .'<td style="background-color:'.$color.';">');
487: $r->print(&mt("Problems Not Contained In A Folder")."</td><td>");
488: $r->print("$topLevelRight / $topLevelParts</td>"
489: .&Apache::loncommon::end_data_table_row());
490: }
491:
492: #
493: # show totals (if applicable), close table
494: #
495: if ($showPoints) {
496: unless ($nostdtotals) {
497: my $maxHelpLink = &Apache::loncommon::help_open_topic("Quick_Grades_Possibly_Correct");
498:
499: $title = $showPoints ? "Points" : "Parts Done";
500: my $totaltitle = $showPoints ? &mt("Awarded Total Points") : &mt("Total Parts Done");
501: $r->print(&Apache::loncommon::start_data_table_row()
502: .'<td colspan="2" align="right">'.$totaltitle.': <b>'.$totalRight.'</b><br />');
503: $r->print(&mt('Max Possible To Date')." $maxHelpLink: <b>$totalPossible</b><br />");
504: $title = $showPoints ? "Points" : "Parts";
505: $r->print(&mt("Total $title In Course").': <b>'.$totalParts.'</b></td>'
506: .&Apache::loncommon::end_data_table_row());
507: }
508: }
509:
510: $r->print(&Apache::loncommon::end_data_table());
511: return;
512: }
513:
514: sub startpage {
515: my ($r,$showPoints) = @_;
516: my $title = "Grading and Statistics";#$showPoints ? "Points Display" : "Completed Problems Display";
517: my $brcrum = [{href=>"/adm/quickgrades",text => "Points Display"}];
518: $r->print(&Apache::loncommon::start_page($title,undef,
519: {'bread_crumbs' => $brcrum})
520: );
521: }
522:
523: sub startGradeScreen {
524: my ($r)=@_;
525:
526: my $showPoints =
527: $env{'course.'.$env{'request.course.id'}.'.grading'} eq 'standard';
528: my $hidetotals =
529: $env{'course.'.$env{'request.course.id'}.'.hidetotals'};
530: my $notshowSPRSlink =
531: (($env{'course.'.$env{'request.course.id'}.'.grading'} eq 'external')
532: || ($env{'course.'.$env{'request.course.id'}.'.grading'} eq 'externalnototals'));
533: my $notshowTotals =
534: $env{'course.'.$env{'request.course.id'}.'.grading'} eq 'externalnototals';
535: my $showSPRSlink =
536: $env{'course.'.$env{'request.course.id'}.'.grading'} eq 'spreadsheet';
537:
538: my $allowed_to_view = &Apache::lonnet::allowed('vgr',$env{'request.course.id'});
539: if ((!$allowed_to_view) && ($env{'request.course.sec'} ne '')) {
540: $allowed_to_view = &Apache::lonnet::allowed('vgr',
541: "$env{'request.course.id'}/$env{'request.course.sec'}");
542: }
543:
544: my $allowed_to_edit = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
545: if ((!$allowed_to_edit) && ($env{'request.course.sec'} ne '')) {
546: $allowed_to_edit = &Apache::lonnet::allowed('mgr',
547: "$env{'request.course.id'}/$env{'request.course.sec'}");
548: }
549:
550: if ($allowed_to_view) {
551: my @notes;
552: push(@notes,&mt('Students do not see total points.')) if ($notshowTotals);
553: push(@notes,&mt('Students do not see link to spreadsheet.')) if ($notshowSPRSlink);
554: push(@notes,&mt('Students will see points based on problem weights.')) if ($showPoints);
555: if (($showPoints) && ($hidetotals ne '')) {
556: if ($hidetotals eq 'all') {
557: push(@notes,&mt('Students do not see course totals.'));
558: } else {
559: my @secs = split(/,/,$hidetotals);
560: if (@secs == 1) {
561: push(@notes,&mt('Students in section [_1] do not see course totals.',
562: $hidetotals));
563: } elsif (@secs > 1) {
564: push(@notes,&mt('Students in sections [_1] do not see course totals.',
565: join(', ',@secs)));
566: }
567: }
568: }
569: push(@notes,&mt('Students will see link to spreadsheet.')) if ($showSPRSlink);
570: push(@notes,&Apache::lonhtmlcommon::coursepreflink(&mt('Grade display settings'),'grading'));
571: $r->print(&Apache::loncommon::head_subbox(join(' ',@notes)));
572: } elsif (!$allowed_to_edit) {
573: if (!$showPoints && !$notshowSPRSlink ) {
574: $r->print(&Apache::loncommon::head_subbox(
575: &mt('This screen shows how many problems (or problem parts) you have completed'
576: .', and how many you have not yet done.'
577: .' You can also look at [_1]a detailed score sheet[_2].'
578: ,'<a href="/adm/studentcalc">','</a>')));
579: }
580: }
581: return;
582: }
583:
584: sub endGradeScreen {
585: my ($r)=@_;
586: $r->print(&Apache::loncommon::end_page());
587: return;
588: }
589:
590: # Pass this two refs to arrays for the start and end color, and a number
591: # from 0 to 1 for how much of the latter you want to mix in. It will
592: # return a string ready to show ("#FFC309");
593: sub mixColors {
594: my $start = shift;
595: my $end = shift;
596: my $ratio = shift;
597:
598: my ($a,$b);
599: my $final = "";
600: $a = $start->[0]; $b = $end->[0];
601: my $mix1 = POSIX::floor((1-$ratio)*$a + $ratio*$b);
602: $a = $start->[1]; $b = $end->[1];
603: my $mix2 = POSIX::floor((1-$ratio)*$a + $ratio*$b);
604: $a = $start->[2]; $b = $end->[2];
605: my $mix3 = POSIX::floor((1-$ratio)*$a + $ratio*$b);
606:
607: $final = sprintf "%02x%02x%02x", $mix1, $mix2, $mix3;
608: return "#" . $final;
609: }
610:
611: 1;
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