1: # The LearningOnline Network with CAPA
2: # Dynamic plot
3: #
4: # $Id: lonplot.pm,v 1.75 2002/05/01 15:56:23 matthew 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: # 12/15/01 Matthew
29: # 12/17 12/18 12/19 12/20 12/21 12/27 12/28 12/30 12/31 Matthew
30: # 01/01/02 Matthew
31: # 01/02 01/03 01/04 01/07 01/08 01/09 Matthew
32: # 01/21 02/05 02/06 2/28Matthew
33:
34: package Apache::lonplot;
35:
36: use strict;
37: use Apache::File;
38: use Apache::response;
39: use Apache::lonxml;
40: use Apache::edit;
41:
42: BEGIN {
43: &Apache::lonxml::register('Apache::lonplot',('gnuplot'));
44: }
45:
46: ##
47: ## Description of data structures:
48: ##
49: ## %plot %key %axis
50: ## --------------------------
51: ## height title color
52: ## width box xmin
53: ## bgcolor pos xmax
54: ## fgcolor ymin
55: ## transparent ymax
56: ## grid
57: ## border
58: ## font
59: ## align
60: ##
61: ## @labels: $labels[$i] = \%label
62: ## %label: text, xpos, ypos, justify
63: ##
64: ## @curves: $curves[$i] = \%curve
65: ## %curve: name, linestyle, ( function | data )
66: ##
67: ## $curves[$i]->{'data'} = [ [x1,x2,x3,x4],
68: ## [y1,y2,y3,y4] ]
69: ##
70:
71: ###################################################################
72: ## ##
73: ## Tests used in checking the validitity of input ##
74: ## ##
75: ###################################################################
76:
77: my $max_str_len = 50; # if a label, title, xlabel, or ylabel text
78: # is longer than this, it will be truncated.
79:
80: my %linestyles =
81: (
82: lines => 2, # Maybe this will be used in the future
83: linespoints => 2, # to check on whether or not they have
84: dots => 2, # supplied enough <data></data> fields
85: points => 2, # to use the given line style. But for
86: steps => 2, # now there are more important things
87: fsteps => 2, # for me to deal with.
88: histeps => 2,
89: errorbars => 3,
90: xerrorbars => [3,4],
91: yerrorbars => [3,4],
92: xyerrorbars => [4,6],
93: boxes => 3,
94: vector => 4
95: );
96:
97: my $int_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};
98: my $real_test =
99: sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d*\.?\d*([eE][+-]\d+)?$/};
100: my $pos_real_test =
101: sub {$_[0]=~s/\s+//g;$_[0]=~/^[+]?\d*\.?\d*([eE][+-]\d+)?$/};
102: my $color_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-f]{6}$/};
103: my $onoff_test = sub {$_[0]=~/^(on|off)$/};
104: my $key_pos_test = sub {$_[0]=~/^(top|bottom|right|left|outside|below| )+$/};
105: my $sml_test = sub {$_[0]=~/^(small|medium|large)$/};
106: my $linestyle_test = sub {exists($linestyles{$_[0]})};
107: my $words_test = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w~!\@\#\$\%^&\*\(\)-=_\+\[\]\{\}:\;\'<>,\.\/\?\\]+ ?)+$/};
108:
109: ###################################################################
110: ## ##
111: ## Attribute metadata ##
112: ## ##
113: ###################################################################
114: my @gnuplot_edit_order =
115: qw/alttag bgcolor fgcolor height width font transparent grid border align/;
116:
117: my $gnuplot_help_text = <<"ENDPLOTHELP";
118: <p>
119: The <b>gnuplot</b> tag allows an author to design a plot which can
120: be created on the fly. This is intended for use in homework problems
121: where each student needs to see a distinct plot. It can be used in
122: conjunction with a <b>script</b> tag to generate random plots.
123: </p><p>
124: A <b>gnuplot</b> tag can contain the following sub-tags:
125: </p>
126: <dl>
127: <dt> Plot Label
128: <dd> Allows you to place text at a given (x,y) coordinate on the plot.
129: <dt> Plot Title
130: <dd> The title of the plot
131: <dt> Plot Xlabel
132: <dd> The label on the horizontal axis of the plot
133: <dt> Plot Ylabel
134: <dd> The label on the vertical axis of the plot
135: <dt> Plot Axes
136: <dd> allows specification of the x and y ranges displayed in the plot
137: <dt> Plot Key
138: <dd> Lists the functions displayed in the plot.
139: <dt> Plot Curve
140: <dd> Sets the data used in the plot.
141: <dt> Plot Tics
142: <dd> Allows specification of the x and y coordinate 'tics' on the axes.
143: This is mostly used to adjust the grid lines when a grid is displayed.
144: </dl>
145: If you are having trouble with your plot, please read the help
146: available on Plot Curve.
147: ENDPLOTHELP
148:
149: my %gnuplot_defaults =
150: (
151: alttag => {
152: default => 'dynamically generated plot',
153: test => $words_test,
154: description => 'brief description of the plot',
155: edit_type => 'entry',
156: size => '40'
157: },
158: height => {
159: default => 300,
160: test => $int_test,
161: description => 'height of image (pixels)',
162: edit_type => 'entry',
163: size => '10'
164: },
165: width => {
166: default => 400,
167: test => $int_test,
168: description => 'width of image (pixels)',
169: edit_type => 'entry',
170: size => '10'
171: },
172: bgcolor => {
173: default => 'xffffff',
174: test => $color_test,
175: description => 'background color of image (xffffff)',
176: edit_type => 'entry',
177: size => '10'
178: },
179: fgcolor => {
180: default => 'x000000',
181: test => $color_test,
182: description => 'foreground color of image (x000000)',
183: edit_type => 'entry',
184: size => '10'
185: },
186: transparent => {
187: default => 'off',
188: test => $onoff_test,
189: description => 'Transparent image',
190: edit_type => 'onoff'
191: },
192: grid => {
193: default => 'on',
194: test => $onoff_test,
195: description => 'Display grid',
196: edit_type => 'onoff'
197: },
198: border => {
199: default => 'on',
200: test => $onoff_test,
201: description => 'Draw border around plot',
202: edit_type => 'onoff'
203: },
204: font => {
205: default => 'medium',
206: test => $sml_test,
207: description => 'Size of font to use',
208: edit_type => 'choice',
209: choices => ['small','medium','large']
210: },
211: align => {
212: default => 'center',
213: test => sub {$_[0]=~/^(left|right|center)$/},
214: description => 'alignment for image in html',
215: edit_type => 'choice',
216: choices => ['left','right','center']
217: }
218: );
219:
220: my %key_defaults =
221: (
222: title => {
223: default => '',
224: test => $words_test,
225: description => 'Title of key',
226: edit_type => 'entry',
227: size => '40'
228: },
229: box => {
230: default => 'off',
231: test => $onoff_test,
232: description => 'Draw a box around the key?',
233: edit_type => 'onoff'
234: },
235: pos => {
236: default => 'top right',
237: test => $key_pos_test,
238: description => 'position of the key on the plot',
239: edit_type => 'choice',
240: choices => ['top left','top right','bottom left','bottom right',
241: 'outside','below']
242: }
243: );
244:
245: my %label_defaults =
246: (
247: xpos => {
248: default => 0,
249: test => $real_test,
250: description => 'x position of label (graph coordinates)',
251: edit_type => 'entry',
252: size => '10'
253: },
254: ypos => {
255: default => 0,
256: test => $real_test,
257: description => 'y position of label (graph coordinates)',
258: edit_type => 'entry',
259: size => '10'
260: },
261: justify => {
262: default => 'left',
263: test => sub {$_[0]=~/^(left|right|center)$/},
264: description => 'justification of the label text on the plot',
265: edit_type => 'choice',
266: choices => ['left','right','center']
267: }
268: );
269:
270: my @tic_edit_order = ('location','mirror','start','increment','end');
271: my %tic_defaults =
272: (
273: location => {
274: default => 'border',
275: test => sub {$_[0]=~/^(border|axis)$/},
276: description => 'Location of tick marks',
277: edit_type => 'choice',
278: choices => ['border','axis']
279: },
280: mirror => {
281: default => 'on',
282: test => $onoff_test,
283: description => 'mirror ticks on opposite axis?',
284: edit_type => 'onoff'
285: },
286: start => {
287: default => '-10.0',
288: test => $real_test,
289: description => 'Start ticks at',
290: edit_type => 'entry',
291: size => '10'
292: },
293: increment => {
294: default => '1.0',
295: test => $real_test,
296: description => 'Place a tick every',
297: edit_type => 'entry',
298: size => '10'
299: },
300: end => {
301: default => ' 10.0',
302: test => $real_test,
303: description => 'Stop ticks at ',
304: edit_type => 'entry',
305: size => '10'
306: },
307: );
308:
309: my @axis_edit_order = ('color','xmin','xmax','ymin','ymax');
310: my %axis_defaults =
311: (
312: color => {
313: default => 'x000000',
314: test => $color_test,
315: description => 'color of axes (x000000)',
316: edit_type => 'entry',
317: size => '10'
318: },
319: xmin => {
320: default => '-10.0',
321: test => $real_test,
322: description => 'minimum x-value shown in plot',
323: edit_type => 'entry',
324: size => '10'
325: },
326: xmax => {
327: default => ' 10.0',
328: test => $real_test,
329: description => 'maximum x-value shown in plot',
330: edit_type => 'entry',
331: size => '10'
332: },
333: ymin => {
334: default => '-10.0',
335: test => $real_test,
336: description => 'minimum y-value shown in plot',
337: edit_type => 'entry',
338: size => '10'
339: },
340: ymax => {
341: default => ' 10.0',
342: test => $real_test,
343: description => 'maximum y-value shown in plot',
344: edit_type => 'entry',
345: size => '10'
346: }
347: );
348:
349: my $curve_help_text = <<"ENDCURVEHELP";
350: The <b>curve</b> tag is where you set the data to be plotted by gnuplot.
351: There are two ways of entering the information:
352: <dl>
353: <dt> Curve Data
354: <dd> Using a <b>data</b> tag you can specify the numbers used to produce
355: the plot.
356: <p>
357: By default, two <b>data</b> tags will be available in a plot. The
358: first will specify X coordinates of the data and the second will
359: give the Y coordinates of the data. When working with a linestyle that
360: requires more than two data sets, inserting another <b>data</b> tag is
361: required. Unfortunately, you must make sure the <b>data</b> tags appear
362: in the order gnuplot expects the data.
363: </p><p>
364: Specifying the data should usually be done with a perl variable or array,
365: such as \@Xdata and \@Ydata. You may also specify numerical data seperated
366: by commas. Again, the order of the <b>data</b> tags is important. The
367: first tag will be the X data and the second will be the Y data.
368: </p>
369: <dt> Curve Function
370: <dd> The <b>function</b> tag allows you to specify the curve to be
371: plotted as a formula that gnuplot can understand. <b>Be careful using this
372: tag.</b> It is surprisingly easy to give gnuplot a function it cannot deal
373: with properly. Be explicit: 2*sin(2*3.141592*x/4) will work but
374: 2sin(2*3.141592x/4) will not. If you do not receive any errors in the
375: gnuplot data but still do not have an image produced, it is likely there
376: is an error in your <b>function</b> tag.
377: </dl>
378: ENDCURVEHELP
379:
380: my @curve_edit_order = ('color','name','linestyle','pointtype','pointsize');
381:
382: my %curve_defaults =
383: (
384: color => {
385: default => 'x000000',
386: test => $color_test,
387: description => 'color of curve (x000000)',
388: edit_type => 'entry',
389: size => '10'
390: },
391: name => {
392: default => '',
393: test => $words_test,
394: description => 'name of curve to appear in key',
395: edit_type => 'entry',
396: size => '20'
397: },
398: linestyle => {
399: default => 'lines',
400: test => $linestyle_test,
401: description => 'Line style',
402: edit_type => 'choice',
403: choices => [keys(%linestyles)]
404: },
405: # gnuplots term=gif driver does not handle linewidth :(
406: # linewidth => {
407: # default => 1,
408: # test => $int_test,
409: # description => 'Line width (may not apply to all line styles)',
410: # edit_type => 'choice',
411: # choices => [1,2,3,4,5,6,7,8,9,10]
412: # },
413: pointsize => {
414: default => 1,
415: test => $pos_real_test,
416: description => 'point size (may not apply to all line styles)',
417: edit_type => 'entry',
418: size => '5'
419: },
420: pointtype => {
421: default => 1,
422: test => $int_test,
423: description => 'point type (may not apply to all line styles)',
424: edit_type => 'choice',
425: choices => [0,1,2,3,4,5,6]
426: }
427: );
428:
429: ###################################################################
430: ## ##
431: ## parsing and edit rendering ##
432: ## ##
433: ###################################################################
434: my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves,%xtics,%ytics);
435:
436: sub start_gnuplot {
437: %plot = (); %key = (); %axis = ();
438: $title = undef; $xlabel = undef; $ylabel = undef;
439: $#labels = -1; $#curves = -1;
440: %xtics = (); %ytics = ();
441: #
442: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
443: my $result='';
444: &Apache::lonxml::register('Apache::lonplot',
445: ('title','xlabel','ylabel','key','axis','label','curve',
446: 'xtics','ytics'));
447: push (@Apache::lonxml::namespace,'lonplot');
448: if ($target eq 'web' || $target eq 'tex') {
449: &get_attributes(\%plot,\%gnuplot_defaults,$parstack,$safeeval,
450: $tagstack->[-1]);
451: } elsif ($target eq 'edit') {
452: $result .= &Apache::edit::tag_start($target,$token,'GnuPlot');
453: $result .= &make_javascript();
454: $result .= &help_win($gnuplot_help_text);
455: $result .= &edit_attributes($target,$token,\%gnuplot_defaults,
456: \@gnuplot_edit_order);
457: } elsif ($target eq 'modified') {
458: my $constructtag=&Apache::edit::get_new_args
459: ($token,$parstack,$safeeval,keys(%gnuplot_defaults));
460: if ($constructtag) {
461: $result = &Apache::edit::rebuild_tag($token);
462: }
463: }
464: return $result;
465: }
466:
467: sub end_gnuplot {
468: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
469: pop @Apache::lonxml::namespace;
470: &Apache::lonxml::deregister('Apache::lonplot',
471: ('title','xlabel','ylabel','key','axis','label','curve'));
472: my $result = '';
473: my $randnumber;
474: # need to call rand everytime start_script would evaluate, as the
475: # safe space rand number generator and the global rand generator
476: # are not seperate
477: if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
478: $target eq 'answer') {
479: $randnumber=int(rand(1000));
480: }
481: if ($target eq 'web' || $target eq 'tex') {
482: &check_inputs(); # Make sure we have all the data we need
483: ##
484: ## Determine filename
485: my $tmpdir = '/home/httpd/perl/tmp/';
486: my $filename = $ENV{'user.name'}.'_'.$ENV{'user.domain'}.
487: '_'.time.'_'.$$.$randnumber.'_plot';
488: ## Write the plot description to the file
489: &write_gnuplot_file($tmpdir,$filename,$target);
490: $filename = &Apache::lonnet::escape($filename);
491: ## return image tag for the plot
492: if ($target eq 'web') {
493: $result .= <<"ENDIMAGE";
494: <img src = "/cgi-bin/plot.gif?file=$filename.data&output=gif"
495: width = "$plot{'width'}"
496: height = "$plot{'height'}"
497: align = "$plot{'align'}"
498: alt = "$plot{'alttag'}" />
499: ENDIMAGE
500: } elsif ($target eq 'tex') {
501: &Apache::lonnet::ssi("/cgi-bin/plot.gif?file=$filename.data&output=eps");
502: $result = '\graphicspath{{/home/httpd/perl/tmp/}}\fbox{\includegraphics{'.&Apache::lonnet::unescape($filename).'.eps}}';
503: }
504: } elsif ($target eq 'edit') {
505: $result.=&Apache::edit::tag_end($target,$token);
506: }
507: return $result;
508: }
509:
510:
511: ##--------------------------------------------------------------- xtics
512: sub start_xtics {
513: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
514: my $result='';
515: if ($target eq 'web' || $target eq 'tex') {
516: &get_attributes(\%xtics,\%tic_defaults,$parstack,$safeeval,
517: $tagstack->[-1]);
518: } elsif ($target eq 'edit') {
519: $result .= &Apache::edit::tag_start($target,$token,'xtics');
520: $result .= &edit_attributes($target,$token,\%tic_defaults,
521: \@tic_edit_order);
522: } elsif ($target eq 'modified') {
523: my $constructtag=&Apache::edit::get_new_args
524: ($token,$parstack,$safeeval,keys(%tic_defaults));
525: if ($constructtag) {
526: $result = &Apache::edit::rebuild_tag($token);
527: }
528: }
529: return $result;
530: }
531:
532: sub end_xtics {
533: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
534: my $result = '';
535: if ($target eq 'web' || $target eq 'tex') {
536: } elsif ($target eq 'edit') {
537: $result.=&Apache::edit::tag_end($target,$token);
538: }
539: return $result;
540: }
541:
542: ##--------------------------------------------------------------- ytics
543: sub start_ytics {
544: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
545: my $result='';
546: if ($target eq 'web' || $target eq 'tex') {
547: &get_attributes(\%ytics,\%tic_defaults,$parstack,$safeeval,
548: $tagstack->[-1]);
549: } elsif ($target eq 'edit') {
550: $result .= &Apache::edit::tag_start($target,$token,'ytics');
551: $result .= &edit_attributes($target,$token,\%tic_defaults,
552: \@tic_edit_order);
553: } elsif ($target eq 'modified') {
554: my $constructtag=&Apache::edit::get_new_args
555: ($token,$parstack,$safeeval,keys(%tic_defaults));
556: if ($constructtag) {
557: $result = &Apache::edit::rebuild_tag($token);
558: }
559: }
560: return $result;
561: }
562:
563: sub end_ytics {
564: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
565: my $result = '';
566: if ($target eq 'web' || $target eq 'tex') {
567: } elsif ($target eq 'edit') {
568: $result.=&Apache::edit::tag_end($target,$token);
569: }
570: return $result;
571: }
572:
573:
574: ##----------------------------------------------------------------- key
575: sub start_key {
576: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
577: my $result='';
578: if ($target eq 'web' || $target eq 'tex') {
579: &get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
580: $tagstack->[-1]);
581: } elsif ($target eq 'edit') {
582: $result .= &Apache::edit::tag_start($target,$token,'Plot Key');
583: $result .= &edit_attributes($target,$token,\%key_defaults);
584: } elsif ($target eq 'modified') {
585: my $constructtag=&Apache::edit::get_new_args
586: ($token,$parstack,$safeeval,keys(%key_defaults));
587: if ($constructtag) {
588: $result = &Apache::edit::rebuild_tag($token);
589: }
590: }
591: return $result;
592: }
593:
594: sub end_key {
595: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
596: my $result = '';
597: if ($target eq 'web' || $target eq 'tex') {
598: } elsif ($target eq 'edit') {
599: $result.=&Apache::edit::tag_end($target,$token);
600: }
601: return $result;
602: }
603:
604: ##------------------------------------------------------------------- title
605: sub start_title {
606: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
607: my $result='';
608: if ($target eq 'web' || $target eq 'tex') {
609: $title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
610: $title=&Apache::run::evaluate($title,$safeeval,$$parstack[-1]);
611: $title =~ s/\n/ /g;
612: if (length($title) > $max_str_len) {
613: $title = substr($title,0,$max_str_len);
614: }
615: } elsif ($target eq 'edit') {
616: $result.=&Apache::edit::tag_start($target,$token,'Plot Title');
617: my $text=&Apache::lonxml::get_all_text("/title",$$parser[-1]);
618: $result.=&Apache::edit::end_row().
619: &Apache::edit::start_spanning_row().
620: &Apache::edit::editline('',$text,'',60);
621: } elsif ($target eq 'modified') {
622: my $text=$$parser[-1]->get_text("/title");
623: $result.=&Apache::edit::rebuild_tag($token);
624: $result.=&Apache::edit::modifiedfield($token);
625: }
626: return $result;
627: }
628:
629: sub end_title {
630: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
631: my $result = '';
632: if ($target eq 'web' || $target eq 'tex') {
633: } elsif ($target eq 'edit') {
634: $result.=&Apache::edit::tag_end($target,$token);
635: }
636: return $result;
637: }
638: ##------------------------------------------------------------------- xlabel
639: sub start_xlabel {
640: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
641: my $result='';
642: if ($target eq 'web' || $target eq 'tex') {
643: $xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
644: $xlabel=&Apache::run::evaluate($xlabel,$safeeval,$$parstack[-1]);
645: $xlabel =~ s/\n/ /g;
646: if (length($xlabel) > $max_str_len) {
647: $xlabel = substr($xlabel,0,$max_str_len);
648: }
649: } elsif ($target eq 'edit') {
650: $result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
651: my $text=&Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
652: $result.=&Apache::edit::end_row().
653: &Apache::edit::start_spanning_row().
654: &Apache::edit::editline('',$text,'',60);
655: } elsif ($target eq 'modified') {
656: my $text=$$parser[-1]->get_text("/xlabel");
657: $result.=&Apache::edit::rebuild_tag($token);
658: $result.=&Apache::edit::modifiedfield($token);
659: }
660: return $result;
661: }
662:
663: sub end_xlabel {
664: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
665: my $result = '';
666: if ($target eq 'web' || $target eq 'tex') {
667: } elsif ($target eq 'edit') {
668: $result.=&Apache::edit::tag_end($target,$token);
669: }
670: return $result;
671: }
672:
673: ##------------------------------------------------------------------- ylabel
674: sub start_ylabel {
675: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
676: my $result='';
677: if ($target eq 'web' || $target eq 'tex') {
678: $ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
679: $ylabel = &Apache::run::evaluate($ylabel,$safeeval,$$parstack[-1]);
680: $ylabel =~ s/\n/ /g;
681: if (length($ylabel) > $max_str_len) {
682: $ylabel = substr($ylabel,0,$max_str_len);
683: }
684: } elsif ($target eq 'edit') {
685: $result .= &Apache::edit::tag_start($target,$token,'Plot Ylabel');
686: my $text = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
687: $result .= &Apache::edit::end_row().
688: &Apache::edit::start_spanning_row().
689: &Apache::edit::editline('',$text,'',60);
690: } elsif ($target eq 'modified') {
691: my $text=$$parser[-1]->get_text("/ylabel");
692: $result.=&Apache::edit::rebuild_tag($token);
693: $result.=&Apache::edit::modifiedfield($token);
694: }
695: return $result;
696: }
697:
698: sub end_ylabel {
699: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
700: my $result = '';
701: if ($target eq 'web' || $target eq 'tex') {
702: } elsif ($target eq 'edit') {
703: $result.=&Apache::edit::tag_end($target,$token);
704: }
705: return $result;
706: }
707:
708: ##------------------------------------------------------------------- label
709: sub start_label {
710: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
711: my $result='';
712: if ($target eq 'web' || $target eq 'tex') {
713: my %label;
714: &get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
715: $tagstack->[-1]);
716: my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
717: $text = &Apache::run::evaluate($text,$safeeval,$$parstack[-1]);
718: $text =~ s/\n/ /g;
719: $text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
720: $label{'text'} = $text;
721: push(@labels,\%label);
722: } elsif ($target eq 'edit') {
723: $result .= &Apache::edit::tag_start($target,$token,'Plot Label');
724: $result .= &edit_attributes($target,$token,\%label_defaults);
725: my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
726: $result .= &Apache::edit::end_row().
727: &Apache::edit::start_spanning_row().
728: &Apache::edit::editline('',$text,'',60);
729: } elsif ($target eq 'modified') {
730: &Apache::edit::get_new_args
731: ($token,$parstack,$safeeval,keys(%label_defaults));
732: $result.=&Apache::edit::rebuild_tag($token);
733: my $text=$$parser[-1]->get_text("/label");
734: $result.=&Apache::edit::modifiedfield($token);
735: }
736: return $result;
737: }
738:
739: sub end_label {
740: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
741: my $result = '';
742: if ($target eq 'web' || $target eq 'tex') {
743: } elsif ($target eq 'edit') {
744: $result.=&Apache::edit::tag_end($target,$token);
745: }
746: return $result;
747: }
748:
749: ##------------------------------------------------------------------- curve
750: sub start_curve {
751: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
752: my $result='';
753: &Apache::lonxml::register('Apache::lonplot',('function','data'));
754: push (@Apache::lonxml::namespace,'curve');
755: if ($target eq 'web' || $target eq 'tex') {
756: my %curve;
757: &get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
758: $tagstack->[-1]);
759: push (@curves,\%curve);
760: } elsif ($target eq 'edit') {
761: $result .= &Apache::edit::tag_start($target,$token,'Curve');
762: $result .= &help_win($curve_help_text);
763: $result .= &edit_attributes($target,$token,\%curve_defaults,
764: \@curve_edit_order);
765: } elsif ($target eq 'modified') {
766: my $constructtag=&Apache::edit::get_new_args
767: ($token,$parstack,$safeeval,keys(%curve_defaults));
768: if ($constructtag) {
769: $result = &Apache::edit::rebuild_tag($token);
770: $result.= &Apache::edit::handle_insert();
771: }
772: }
773: return $result;
774: }
775:
776: sub end_curve {
777: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
778: my $result = '';
779: pop @Apache::lonxml::namespace;
780: &Apache::lonxml::deregister('Apache::lonplot',('function','data'));
781: if ($target eq 'web' || $target eq 'tex') {
782: } elsif ($target eq 'edit') {
783: $result.=&Apache::edit::tag_end($target,$token);
784: }
785: return $result;
786: }
787:
788: ##------------------------------------------------------------ curve function
789: sub start_function {
790: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
791: my $result='';
792: if ($target eq 'web' || $target eq 'tex') {
793: if (exists($curves[-1]->{'data'})) {
794: &Apache::lonxml::warning('Use of <function> precludes use of <data>. The <data> will be omitted in favor of the <function> declaration.');
795: delete $curves[-1]->{'data'} ;
796: }
797: my $function = &Apache::lonxml::get_all_text("/function",$$parser[-1]);
798: $function = &Apache::run::evaluate($function,$safeeval,$$parstack[-1]);
799: $curves[-1]->{'function'} = $function;
800: } elsif ($target eq 'edit') {
801: $result .= &Apache::edit::tag_start($target,$token,'Gnuplot compatible curve function');
802: my $text = &Apache::lonxml::get_all_text("/function",$$parser[-1]);
803: $result .= &Apache::edit::end_row().
804: &Apache::edit::start_spanning_row().
805: &Apache::edit::editline('',$text,'',60);
806: } elsif ($target eq 'modified') {
807: $result.=&Apache::edit::rebuild_tag($token);
808: my $text=$$parser[-1]->get_text("/function");
809: $result.=&Apache::edit::modifiedfield($token);
810: }
811: return $result;
812: }
813:
814: sub end_function {
815: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
816: my $result = '';
817: if ($target eq 'web' || $target eq 'tex') {
818: } elsif ($target eq 'edit') {
819: $result .= &Apache::edit::end_table();
820: }
821: return $result;
822: }
823:
824: ##------------------------------------------------------------ curve data
825: sub start_data {
826: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
827: my $result='';
828: if ($target eq 'web' || $target eq 'tex') {
829: if (exists($curves[-1]->{'function'})) {
830: &Apache::lonxml::warning('Use of <data> precludes use of .'.
831: '<function>. The <function> will be omitted in favor of '.
832: 'the <data> declaration.');
833: delete($curves[-1]->{'function'});
834: }
835: my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
836: $datatext=&Apache::run::evaluate($datatext,$safeeval,$$parstack[-1]);
837: # Deal with cases where we're given an array...
838: if ($datatext =~ /^\@/) {
839: $datatext = &Apache::run::run('return "'.$datatext.'"',
840: $safeeval,1);
841: }
842: $datatext =~ s/\s+/ /g;
843: # Need to do some error checking on the @data array -
844: # make sure it's all numbers and make sure each array
845: # is of the same length.
846: my @data;
847: if ($datatext =~ /,/) { # comma deliminated
848: @data = split /,/,$datatext;
849: } else { # Assume it's space seperated.
850: @data = split / /,$datatext;
851: }
852: for (my $i=0;$i<=$#data;$i++) {
853: # Check that it's non-empty
854: if (! defined($data[$i])) {
855: &Apache::lonxml::warning(
856: 'undefined <data> value. Replacing with '.
857: ' pi/e = 1.15572734979092');
858: $data[$i] = 1.15572734979092;
859: }
860: # Check that it's a number
861: if (! &$real_test($data[$i]) & ! &$int_test($data[$i])) {
862: &Apache::lonxml::warning(
863: 'Bad <data> value of '.$data[$i].' Replacing with '.
864: ' pi/e = 1.15572734979092');
865: $data[$i] = 1.15572734979092;
866: }
867: }
868: # complain if the number of data points is not the same as
869: # in previous sets of data.
870: if (($curves[-1]->{'data'}) && ($#data != $#{@{$curves[-1]->{'data'}->[0]}})){
871: &Apache::lonxml::warning
872: ('Number of data points is not consistent with previous '.
873: 'number of data points');
874: }
875: push @{$curves[-1]->{'data'}},\@data;
876: } elsif ($target eq 'edit') {
877: $result .= &Apache::edit::tag_start($target,$token,'Comma or space deliminated curve data');
878: my $text = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
879: $result .= &Apache::edit::end_row().
880: &Apache::edit::start_spanning_row().
881: &Apache::edit::editline('',$text,'',60);
882: } elsif ($target eq 'modified') {
883: $result.=&Apache::edit::rebuild_tag($token);
884: my $text=$$parser[-1]->get_text("/data");
885: $result.=&Apache::edit::modifiedfield($token);
886: }
887: return $result;
888: }
889:
890: sub end_data {
891: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
892: my $result = '';
893: if ($target eq 'web' || $target eq 'tex') {
894: } elsif ($target eq 'edit') {
895: $result .= &Apache::edit::end_table();
896: }
897: return $result;
898: }
899:
900: ##------------------------------------------------------------------- axis
901: sub start_axis {
902: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
903: my $result='';
904: if ($target eq 'web' || $target eq 'tex') {
905: &get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
906: $tagstack->[-1]);
907: } elsif ($target eq 'edit') {
908: $result .= &Apache::edit::tag_start($target,$token,'Plot Axes');
909: $result .= &edit_attributes($target,$token,\%axis_defaults,
910: \@axis_edit_order);
911: } elsif ($target eq 'modified') {
912: my $constructtag=&Apache::edit::get_new_args
913: ($token,$parstack,$safeeval,keys(%axis_defaults));
914: if ($constructtag) {
915: $result = &Apache::edit::rebuild_tag($token);
916: }
917: }
918: return $result;
919: }
920:
921: sub end_axis {
922: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
923: my $result = '';
924: if ($target eq 'web' || $target eq 'tex') {
925: } elsif ($target eq 'edit') {
926: $result.=&Apache::edit::tag_end($target,$token);
927: } elsif ($target eq 'modified') {
928: }
929: return $result;
930: }
931:
932: ###################################################################
933: ## ##
934: ## Utility Functions ##
935: ## ##
936: ###################################################################
937:
938: ##----------------------------------------------------------- set_defaults
939: sub set_defaults {
940: my ($var,$defaults) = @_;
941: my $key;
942: foreach $key (keys(%$defaults)) {
943: $var->{$key} = $defaults->{$key}->{'default'};
944: }
945: }
946:
947: ##------------------------------------------------------------------- misc
948: sub get_attributes{
949: my ($values,$defaults,$parstack,$safeeval,$tag) = @_;
950: foreach my $attr (keys(%{$defaults})) {
951: $values->{$attr} =
952: &Apache::lonxml::get_param($attr,$parstack,$safeeval);
953: if ($values->{$attr} eq '' | !defined($values->{$attr})) {
954: $values->{$attr} = $defaults->{$attr}->{'default'};
955: next;
956: }
957: my $test = $defaults->{$attr}->{'test'};
958: if (! &$test($values->{$attr})) {
959: &Apache::lonxml::warning
960: ($tag.':'.$attr.': Bad value.'.'Replacing your value with : '
961: .$defaults->{$attr}->{'default'} );
962: $values->{$attr} = $defaults->{$attr}->{'default'};
963: }
964: }
965: return ;
966: }
967:
968: ##------------------------------------------------------- write_gnuplot_file
969: sub write_gnuplot_file {
970: my ($tmpdir,$filename,$target)= @_;
971: my $gnuplot_input = '';
972: my $curve;
973: # Collect all the colors
974: my @Colors;
975: push @Colors, $plot{'bgcolor'};
976: push @Colors, $plot{'fgcolor'};
977: push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});
978: foreach $curve (@curves) {
979: push @Colors, ($curve->{'color'} ne '' ?
980: $curve->{'color'} :
981: $plot{'fgcolor'} );
982: }
983: # set term
984: if ($target eq 'web') {
985: $gnuplot_input .= 'set term gif ';
986: $gnuplot_input .= 'transparent ' if ($plot{'transparent'} eq 'on');
987: $gnuplot_input .= $plot{'font'} . ' ';
988: $gnuplot_input .= 'size '.$plot{'width'}.','.$plot{'height'}.' ';
989: $gnuplot_input .= "@Colors\n";
990: # set output
991: $gnuplot_input .= "set output\n";
992: } elsif ($target eq 'tex') {
993: $gnuplot_input .= "set term postscript eps monochrome solid\n";
994: $gnuplot_input .= "set output \"/home/httpd/perl/tmp/".
995: &Apache::lonnet::unescape($filename).".eps\"\n";
996: }
997: # grid
998: $gnuplot_input .= 'set grid'.$/ if ($plot{'grid'} eq 'on');
999: # border
1000: $gnuplot_input .= ($plot{'border'} eq 'on'?
1001: 'set border'.$/ :
1002: 'set noborder'.$/ );
1003: # title, xlabel, ylabel
1004: # titles
1005: $gnuplot_input .= "set title \"$title\"\n" if (defined($title)) ;
1006: $gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
1007: $gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
1008: # tics
1009: if (%xtics) {
1010: $gnuplot_input .= "set xtics $xtics{'location'} ";
1011: $gnuplot_input .= ( $xtics{'mirror'} eq 'on'?"mirror ":"nomirror ");
1012: $gnuplot_input .= "$xtics{'start'}, ";
1013: $gnuplot_input .= "$xtics{'increment'}, ";
1014: $gnuplot_input .= "$xtics{'end'}\n";
1015: }
1016: if (%ytics) {
1017: $gnuplot_input .= "set ytics $ytics{'location'} ";
1018: $gnuplot_input .= ( $ytics{'mirror'} eq 'on'?"mirror ":"nomirror ");
1019: $gnuplot_input .= "$ytics{'start'}, ";
1020: $gnuplot_input .= "$ytics{'increment'}, ";
1021: $gnuplot_input .= "$ytics{'end'}\n";
1022: }
1023: # axis
1024: if (%axis) {
1025: $gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
1026: $gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
1027: }
1028: # Key
1029: if (%key) {
1030: $gnuplot_input .= 'set key '.$key{'pos'}.' ';
1031: if ($key{'title'} ne '') {
1032: $gnuplot_input .= 'title "'.$key{'title'}.'" ';
1033: }
1034: $gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;
1035: } else {
1036: $gnuplot_input .= 'set nokey'.$/;
1037: }
1038: # labels
1039: my $label;
1040: foreach $label (@labels) {
1041: $gnuplot_input .= 'set label "'.$label->{'text'}.'" at '.
1042: $label->{'xpos'}.','.$label->{'ypos'}.' '.$label->{'justify'}.$/ ;
1043: }
1044: if ($target eq 'tex') {
1045: $gnuplot_input .="set size 1,".$plot{'height'}/$plot{'width'}*1.36;
1046: $gnuplot_input .="\n";
1047: }
1048: # curves
1049: $gnuplot_input .= 'plot ';
1050: for (my $i = 0;$i<=$#curves;$i++) {
1051: $curve = $curves[$i];
1052: $gnuplot_input.= ', ' if ($i > 0);
1053: if (exists($curve->{'function'})) {
1054: $gnuplot_input.=
1055: $curve->{'function'}.' title "'.
1056: $curve->{'name'}.'" with '.
1057: $curve->{'linestyle'};
1058: $gnuplot_input.= ' linewidth 4 ' if ($target eq 'tex');
1059: if (($curve->{'linestyle'} eq 'points') ||
1060: ($curve->{'linestyle'} eq 'linespoints') ||
1061: ($curve->{'linestyle'} eq 'errorbars') ||
1062: ($curve->{'linestyle'} eq 'xerrorbars') ||
1063: ($curve->{'linestyle'} eq 'yerrorbars') ||
1064: ($curve->{'linestyle'} eq 'xyerrorbars')) {
1065: $gnuplot_input.=' pointtype '.$curve->{'pointtype'};
1066: $gnuplot_input.=' pointsize '.$curve->{'pointsize'};
1067: }
1068: } elsif (exists($curve->{'data'})) {
1069: # Store data values in $datatext
1070: my $datatext = '';
1071: # get new filename
1072: my $datafilename = "$tmpdir/$filename.data.$i";
1073: my $fh=Apache::File->new(">$datafilename");
1074: # Compile data
1075: my @Data = @{$curve->{'data'}};
1076: my @Data0 = @{$Data[0]};
1077: for (my $i =0; $i<=$#Data0; $i++) {
1078: my $dataset;
1079: foreach $dataset (@Data) {
1080: $datatext .= $dataset->[$i] . ' ';
1081: }
1082: $datatext .= $/;
1083: }
1084: # write file
1085: print $fh $datatext;
1086: close ($fh);
1087: # generate gnuplot text
1088: $gnuplot_input.= '"'.$datafilename.'" title "'.
1089: $curve->{'name'}.'" with '.
1090: $curve->{'linestyle'};
1091: $gnuplot_input.= ' linewidth 4 ' if ($target eq 'tex');
1092: if (($curve->{'linestyle'} eq 'points') ||
1093: ($curve->{'linestyle'} eq 'linespoints') ||
1094: ($curve->{'linestyle'} eq 'errorbars') ||
1095: ($curve->{'linestyle'} eq 'xerrorbars') ||
1096: ($curve->{'linestyle'} eq 'yerrorbars') ||
1097: ($curve->{'linestyle'} eq 'xyerrorbars')) {
1098: $gnuplot_input.=' pointtype '.$curve->{'pointtype'};
1099: $gnuplot_input.=' pointsize '.$curve->{'pointsize'};
1100: }
1101: }
1102: }
1103: # Write the output to a file.
1104: my $fh=Apache::File->new(">$tmpdir$filename.data");
1105: print $fh $gnuplot_input;
1106: close($fh);
1107: # That's all folks.
1108: return ;
1109: }
1110:
1111: #---------------------------------------------- check_inputs
1112: sub check_inputs {
1113: ## Note: no inputs, no outputs - this acts only on global variables.
1114: ## Make sure we have all the input we need:
1115: if (! %plot) { &set_defaults(\%plot,\%gnuplot_defaults); }
1116: if (! %key ) {} # No key for this plot, thats okay
1117: # if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
1118: if (! defined($title )) {} # No title for this plot, thats okay
1119: if (! defined($xlabel)) {} # No xlabel for this plot, thats okay
1120: if (! defined($ylabel)) {} # No ylabel for this plot, thats okay
1121: if ($#labels < 0) { } # No labels for this plot, thats okay
1122: if ($#curves < 0) {
1123: &Apache::lonxml::warning("No curves specified for plot!!!!");
1124: return '';
1125: }
1126: my $curve;
1127: foreach $curve (@curves) {
1128: if (!defined($curve->{'function'})&&!defined($curve->{'data'})){
1129: &Apache::lonxml::warning("One of the curves specified did not contain any <data> or <function> declarations\n");
1130: return '';
1131: }
1132: }
1133: }
1134:
1135: #------------------------------------------------ make_edit
1136: sub edit_attributes {
1137: my ($target,$token,$defaults,$keys) = @_;
1138: my ($result,@keys);
1139: if ($keys && ref($keys) eq 'ARRAY') {
1140: @keys = @$keys;
1141: } else {
1142: @keys = sort(keys(%$defaults));
1143: }
1144: foreach my $attr (@keys) {
1145: # append a ' ' to the description if it doesn't have one already.
1146: my $description = $defaults->{$attr}->{'description'};
1147: $description .= ' ' if ($description !~ / $/);
1148: if ($defaults->{$attr}->{'edit_type'} eq 'entry') {
1149: $result .= &Apache::edit::text_arg
1150: ($description,$attr,$token,
1151: $defaults->{$attr}->{'size'});
1152: } elsif ($defaults->{$attr}->{'edit_type'} eq 'choice') {
1153: $result .= &Apache::edit::select_arg
1154: ($description,$attr,$defaults->{$attr}->{'choices'},$token);
1155: } elsif ($defaults->{$attr}->{'edit_type'} eq 'onoff') {
1156: $result .= &Apache::edit::select_arg
1157: ($description,$attr,['on','off'],$token);
1158: }
1159: $result .= '<br />';
1160: }
1161: return $result;
1162: }
1163:
1164:
1165: ###################################################################
1166: ## ##
1167: ## Insertion functions for editing plots ##
1168: ## ##
1169: ###################################################################
1170:
1171: sub insert_gnuplot {
1172: my $result = '';
1173: # plot attributes
1174: $result .= "\n<gnuplot ";
1175: foreach my $attr (keys(%gnuplot_defaults)) {
1176: $result .= "\n $attr=\"$gnuplot_defaults{$attr}->{'default'}\"";
1177: }
1178: $result .= ">";
1179: # Add the components (most are commented out for simplicity)
1180: # $result .= &insert_key();
1181: # $result .= &insert_axis();
1182: # $result .= &insert_title();
1183: # $result .= &insert_xlabel();
1184: # $result .= &insert_ylabel();
1185: $result .= &insert_curve();
1186: # close up the <gnuplot>
1187: $result .= "\n</gnuplot>";
1188: return $result;
1189: }
1190:
1191: sub insert_tics {
1192: my $result;
1193: $result .= &insert_xtics() . &insert_ytics;
1194: return $result;
1195: }
1196:
1197: sub insert_xtics {
1198: my $result;
1199: $result .= "\n <xtics ";
1200: foreach my $attr (keys(%tic_defaults)) {
1201: $result .= "\n $attr=\"$tic_defaults{$attr}->{'default'}\" ";
1202: }
1203: $result .= "/>";
1204: return $result;
1205: }
1206:
1207: sub insert_ytics {
1208: my $result;
1209: $result .= "\n <ytics ";
1210: foreach my $attr (keys(%tic_defaults)) {
1211: $result .= "\n $attr=\"$tic_defaults{$attr}->{'default'}\" ";
1212: }
1213: $result .= "/>";
1214: return $result;
1215: }
1216:
1217: sub insert_key {
1218: my $result;
1219: $result .= "\n <key ";
1220: foreach my $attr (keys(%key_defaults)) {
1221: $result .= "\n $attr=\"$key_defaults{$attr}->{'default'}\"";
1222: }
1223: $result .= " />";
1224: return $result;
1225: }
1226:
1227: sub insert_axis{
1228: my $result;
1229: $result .= "\n <axis ";
1230: foreach my $attr (keys(%axis_defaults)) {
1231: $result .= "\n $attr=\"$axis_defaults{$attr}->{'default'}\"";
1232: }
1233: $result .= " />";
1234: return $result;
1235: }
1236:
1237: sub insert_title { return "\n <title></title>"; }
1238: sub insert_xlabel { return "\n <xlabel></xlabel>"; }
1239: sub insert_ylabel { return "\n <ylabel></ylabel>"; }
1240:
1241: sub insert_label {
1242: my $result;
1243: $result .= "\n <label ";
1244: foreach my $attr (keys(%label_defaults)) {
1245: $result .= "\n $attr=\"".
1246: $label_defaults{$attr}->{'default'}."\"";
1247: }
1248: $result .= "></label>";
1249: return $result;
1250: }
1251:
1252: sub insert_curve {
1253: my $result;
1254: $result .= "\n <curve ";
1255: foreach my $attr (keys(%curve_defaults)) {
1256: $result .= "\n $attr=\"".
1257: $curve_defaults{$attr}->{'default'}."\"";
1258: }
1259: $result .= " >";
1260: $result .= &insert_data().&insert_data()."\n </curve>";
1261: }
1262:
1263: sub insert_function {
1264: my $result;
1265: $result .= "\n <function></function>";
1266: return $result;
1267: }
1268:
1269: sub insert_data {
1270: my $result;
1271: $result .= "\n <data></data>";
1272: return $result;
1273: }
1274:
1275: ##----------------------------------------------------------------------
1276: # Javascript functions to display help for tags
1277:
1278: sub make_javascript {
1279: my $helpwindowwidth = 400;
1280: my $helpwindowheight = 400;
1281: my $result = '';
1282: $result.=<<"ENDFUNCTION";
1283: <script language="JavaScript">
1284: function openWin(text)
1285: {
1286: newWin = open("", "new_W", "width=$helpwindowwidth,height=$helpwindowheight,resizable=1,scrollbars=1");
1287: newWin.document.open("text/html", "replace");
1288: newWin.document.writeln(text);
1289: newWin.document.writeln('<center><a href=\"javascript:window.close()\">close this window</a></center>');
1290: newWin.document.close();
1291: }
1292: </script>
1293: ENDFUNCTION
1294: return $result;
1295: }
1296:
1297: sub help_win {
1298: my ($helptext)=@_;
1299: $helptext =~ s/\n/ /g;
1300: $helptext =~ s/\'/\\\'/g;
1301: my $result = '';
1302: $result.=<<"ENDWIN";
1303: <table width="100%"><tr><td align="right">
1304: <a href="javascript:openWin('$helptext')">help</a>
1305: </td></tr></table><hr />
1306: ENDWIN
1307: return $result;
1308: }
1309: ##----------------------------------------------------------------------
1310: 1;
1311: __END__
1312:
1313:
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