1: # The LearningOnline Network with CAPA
2: # Dynamic plot
3: #
4: # $Id: lonplot.pm,v 1.81 2003/02/07 22:03:21 albertel 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;$_[0]=~/^x[\da-fA-F]{6}$/};
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 samples 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: samples => {
212: default => '100',
213: test => $int_test,
214: description => 'Number of samples for non-data plots',
215: edit_type => 'choice',
216: choices => ['100','200','500','1000','2000','5000']
217: },
218: align => {
219: default => 'center',
220: test => sub {$_[0]=~/^(left|right|center)$/},
221: description => 'alignment for image in html',
222: edit_type => 'choice',
223: choices => ['left','right','center']
224: }
225: );
226:
227: my %key_defaults =
228: (
229: title => {
230: default => '',
231: test => $words_test,
232: description => 'Title of key',
233: edit_type => 'entry',
234: size => '40'
235: },
236: box => {
237: default => 'off',
238: test => $onoff_test,
239: description => 'Draw a box around the key?',
240: edit_type => 'onoff'
241: },
242: pos => {
243: default => 'top right',
244: test => $key_pos_test,
245: description => 'position of the key on the plot',
246: edit_type => 'choice',
247: choices => ['top left','top right','bottom left','bottom right',
248: 'outside','below']
249: }
250: );
251:
252: my %label_defaults =
253: (
254: xpos => {
255: default => 0,
256: test => $real_test,
257: description => 'x position of label (graph coordinates)',
258: edit_type => 'entry',
259: size => '10'
260: },
261: ypos => {
262: default => 0,
263: test => $real_test,
264: description => 'y position of label (graph coordinates)',
265: edit_type => 'entry',
266: size => '10'
267: },
268: justify => {
269: default => 'left',
270: test => sub {$_[0]=~/^(left|right|center)$/},
271: description => 'justification of the label text on the plot',
272: edit_type => 'choice',
273: choices => ['left','right','center']
274: }
275: );
276:
277: my @tic_edit_order = ('location','mirror','start','increment','end');
278: my %tic_defaults =
279: (
280: location => {
281: default => 'border',
282: test => sub {$_[0]=~/^(border|axis)$/},
283: description => 'Location of tick marks',
284: edit_type => 'choice',
285: choices => ['border','axis']
286: },
287: mirror => {
288: default => 'on',
289: test => $onoff_test,
290: description => 'mirror ticks on opposite axis?',
291: edit_type => 'onoff'
292: },
293: start => {
294: default => '-10.0',
295: test => $real_test,
296: description => 'Start ticks at',
297: edit_type => 'entry',
298: size => '10'
299: },
300: increment => {
301: default => '1.0',
302: test => $real_test,
303: description => 'Place a tick every',
304: edit_type => 'entry',
305: size => '10'
306: },
307: end => {
308: default => ' 10.0',
309: test => $real_test,
310: description => 'Stop ticks at ',
311: edit_type => 'entry',
312: size => '10'
313: },
314: );
315:
316: my @axis_edit_order = ('color','xmin','xmax','ymin','ymax');
317: my %axis_defaults =
318: (
319: color => {
320: default => 'x000000',
321: test => $color_test,
322: description => 'color of grid lines (x000000)',
323: edit_type => 'entry',
324: size => '10'
325: },
326: xmin => {
327: default => '-10.0',
328: test => $real_test,
329: description => 'minimum x-value shown in plot',
330: edit_type => 'entry',
331: size => '10'
332: },
333: xmax => {
334: default => ' 10.0',
335: test => $real_test,
336: description => 'maximum x-value shown in plot',
337: edit_type => 'entry',
338: size => '10'
339: },
340: ymin => {
341: default => '-10.0',
342: test => $real_test,
343: description => 'minimum y-value shown in plot',
344: edit_type => 'entry',
345: size => '10'
346: },
347: ymax => {
348: default => ' 10.0',
349: test => $real_test,
350: description => 'maximum y-value shown in plot',
351: edit_type => 'entry',
352: size => '10'
353: }
354: );
355:
356: my $curve_help_text = <<"ENDCURVEHELP";
357: The <b>curve</b> tag is where you set the data to be plotted by gnuplot.
358: There are two ways of entering the information:
359: <dl>
360: <dt> Curve Data
361: <dd> Using a <b>data</b> tag you can specify the numbers used to produce
362: the plot.
363: <p>
364: By default, two <b>data</b> tags will be available in a plot. The
365: first will specify X coordinates of the data and the second will
366: give the Y coordinates of the data. When working with a linestyle that
367: requires more than two data sets, inserting another <b>data</b> tag is
368: required. Unfortunately, you must make sure the <b>data</b> tags appear
369: in the order gnuplot expects the data.
370: </p><p>
371: Specifying the data should usually be done with a perl variable or array,
372: such as \@Xdata and \@Ydata. You may also specify numerical data seperated
373: by commas. Again, the order of the <b>data</b> tags is important. The
374: first tag will be the X data and the second will be the Y data.
375: </p>
376: <dt> Curve Function
377: <dd> The <b>function</b> tag allows you to specify the curve to be
378: plotted as a formula that gnuplot can understand. <b>Be careful using this
379: tag.</b> It is surprisingly easy to give gnuplot a function it cannot deal
380: with properly. Be explicit: 2*sin(2*3.141592*x/4) will work but
381: 2sin(2*3.141592x/4) will not. If you do not receive any errors in the
382: gnuplot data but still do not have an image produced, it is likely there
383: is an error in your <b>function</b> tag.
384: </dl>
385: ENDCURVEHELP
386:
387: my @curve_edit_order = ('color','name','linestyle','pointtype','pointsize');
388:
389: my %curve_defaults =
390: (
391: color => {
392: default => 'x000000',
393: test => $color_test,
394: description => 'color of curve (x000000)',
395: edit_type => 'entry',
396: size => '10'
397: },
398: name => {
399: default => '',
400: test => $words_test,
401: description => 'name of curve to appear in key',
402: edit_type => 'entry',
403: size => '20'
404: },
405: linestyle => {
406: default => 'lines',
407: test => $linestyle_test,
408: description => 'Line style',
409: edit_type => 'choice',
410: choices => [keys(%linestyles)]
411: },
412: # gnuplots term=gif driver does not handle linewidth :(
413: # linewidth => {
414: # default => 1,
415: # test => $int_test,
416: # description => 'Line width (may not apply to all line styles)',
417: # edit_type => 'choice',
418: # choices => [1,2,3,4,5,6,7,8,9,10]
419: # },
420: pointsize => {
421: default => 1,
422: test => $pos_real_test,
423: description => 'point size (may not apply to all line styles)',
424: edit_type => 'entry',
425: size => '5'
426: },
427: pointtype => {
428: default => 1,
429: test => $int_test,
430: description => 'point type (may not apply to all line styles)',
431: edit_type => 'choice',
432: choices => [0,1,2,3,4,5,6]
433: }
434: );
435:
436: ###################################################################
437: ## ##
438: ## parsing and edit rendering ##
439: ## ##
440: ###################################################################
441: my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves,%xtics,%ytics);
442:
443: sub start_gnuplot {
444: %plot = (); %key = (); %axis = ();
445: $title = undef; $xlabel = undef; $ylabel = undef;
446: $#labels = -1; $#curves = -1;
447: %xtics = (); %ytics = ();
448: #
449: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
450: my $result='';
451: &Apache::lonxml::register('Apache::lonplot',
452: ('title','xlabel','ylabel','key','axis','label','curve',
453: 'xtics','ytics'));
454: push (@Apache::lonxml::namespace,'lonplot');
455: if ($target eq 'web' || $target eq 'tex') {
456: &get_attributes(\%plot,\%gnuplot_defaults,$parstack,$safeeval,
457: $tagstack->[-1]);
458: } elsif ($target eq 'edit') {
459: $result .= &Apache::edit::tag_start($target,$token,'GnuPlot');
460: $result .= &make_javascript();
461: $result .= &help_win($gnuplot_help_text);
462: $result .= &edit_attributes($target,$token,\%gnuplot_defaults,
463: \@gnuplot_edit_order);
464: } elsif ($target eq 'modified') {
465: my $constructtag=&Apache::edit::get_new_args
466: ($token,$parstack,$safeeval,keys(%gnuplot_defaults));
467: if ($constructtag) {
468: $result = &Apache::edit::rebuild_tag($token);
469: }
470: }
471: return $result;
472: }
473:
474: sub end_gnuplot {
475: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
476: pop @Apache::lonxml::namespace;
477: &Apache::lonxml::deregister('Apache::lonplot',
478: ('title','xlabel','ylabel','key','axis','label','curve'));
479: my $result = '';
480: my $randnumber;
481: # need to call rand everytime start_script would evaluate, as the
482: # safe space rand number generator and the global rand generator
483: # are not seperate
484: if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
485: $target eq 'answer') {
486: $randnumber=int(rand(1000));
487: }
488: if ($target eq 'web' || $target eq 'tex') {
489: &check_inputs(); # Make sure we have all the data we need
490: ##
491: ## Determine filename
492: my $tmpdir = '/home/httpd/perl/tmp/';
493: my $filename = $ENV{'user.name'}.'_'.$ENV{'user.domain'}.
494: '_'.time.'_'.$$.$randnumber.'_plot';
495: ## Write the plot description to the file
496: &write_gnuplot_file($tmpdir,$filename,$target);
497: $filename = &Apache::lonnet::escape($filename);
498: ## return image tag for the plot
499: if ($target eq 'web') {
500: $result .= <<"ENDIMAGE";
501: <img src = "/cgi-bin/plot.gif?file=$filename.data&output=gif"
502: width = "$plot{'width'}"
503: height = "$plot{'height'}"
504: align = "$plot{'align'}"
505: alt = "$plot{'alttag'}" />
506: ENDIMAGE
507: } elsif ($target eq 'tex') {
508: &Apache::lonnet::ssi("/cgi-bin/plot.gif?file=$filename.data&output=eps");
509: $result = '\graphicspath{{/home/httpd/perl/tmp/}}\includegraphics{'.&Apache::lonnet::unescape($filename).'.eps}';
510: }
511: } elsif ($target eq 'edit') {
512: $result.=&Apache::edit::tag_end($target,$token);
513: }
514: return $result;
515: }
516:
517:
518: ##--------------------------------------------------------------- xtics
519: sub start_xtics {
520: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
521: my $result='';
522: if ($target eq 'web' || $target eq 'tex') {
523: &get_attributes(\%xtics,\%tic_defaults,$parstack,$safeeval,
524: $tagstack->[-1]);
525: } elsif ($target eq 'edit') {
526: $result .= &Apache::edit::tag_start($target,$token,'xtics');
527: $result .= &edit_attributes($target,$token,\%tic_defaults,
528: \@tic_edit_order);
529: } elsif ($target eq 'modified') {
530: my $constructtag=&Apache::edit::get_new_args
531: ($token,$parstack,$safeeval,keys(%tic_defaults));
532: if ($constructtag) {
533: $result = &Apache::edit::rebuild_tag($token);
534: }
535: }
536: return $result;
537: }
538:
539: sub end_xtics {
540: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
541: my $result = '';
542: if ($target eq 'web' || $target eq 'tex') {
543: } elsif ($target eq 'edit') {
544: $result.=&Apache::edit::tag_end($target,$token);
545: }
546: return $result;
547: }
548:
549: ##--------------------------------------------------------------- ytics
550: sub start_ytics {
551: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
552: my $result='';
553: if ($target eq 'web' || $target eq 'tex') {
554: &get_attributes(\%ytics,\%tic_defaults,$parstack,$safeeval,
555: $tagstack->[-1]);
556: } elsif ($target eq 'edit') {
557: $result .= &Apache::edit::tag_start($target,$token,'ytics');
558: $result .= &edit_attributes($target,$token,\%tic_defaults,
559: \@tic_edit_order);
560: } elsif ($target eq 'modified') {
561: my $constructtag=&Apache::edit::get_new_args
562: ($token,$parstack,$safeeval,keys(%tic_defaults));
563: if ($constructtag) {
564: $result = &Apache::edit::rebuild_tag($token);
565: }
566: }
567: return $result;
568: }
569:
570: sub end_ytics {
571: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
572: my $result = '';
573: if ($target eq 'web' || $target eq 'tex') {
574: } elsif ($target eq 'edit') {
575: $result.=&Apache::edit::tag_end($target,$token);
576: }
577: return $result;
578: }
579:
580:
581: ##----------------------------------------------------------------- key
582: sub start_key {
583: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
584: my $result='';
585: if ($target eq 'web' || $target eq 'tex') {
586: &get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
587: $tagstack->[-1]);
588: } elsif ($target eq 'edit') {
589: $result .= &Apache::edit::tag_start($target,$token,'Plot Key');
590: $result .= &edit_attributes($target,$token,\%key_defaults);
591: } elsif ($target eq 'modified') {
592: my $constructtag=&Apache::edit::get_new_args
593: ($token,$parstack,$safeeval,keys(%key_defaults));
594: if ($constructtag) {
595: $result = &Apache::edit::rebuild_tag($token);
596: }
597: }
598: return $result;
599: }
600:
601: sub end_key {
602: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
603: my $result = '';
604: if ($target eq 'web' || $target eq 'tex') {
605: } elsif ($target eq 'edit') {
606: $result.=&Apache::edit::tag_end($target,$token);
607: }
608: return $result;
609: }
610:
611: ##------------------------------------------------------------------- title
612: sub start_title {
613: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
614: my $result='';
615: if ($target eq 'web' || $target eq 'tex') {
616: $title = &Apache::lonxml::get_all_text("/title",$parser);
617: $title=&Apache::run::evaluate($title,$safeeval,$$parstack[-1]);
618: $title =~ s/\n/ /g;
619: if (length($title) > $max_str_len) {
620: $title = substr($title,0,$max_str_len);
621: }
622: } elsif ($target eq 'edit') {
623: $result.=&Apache::edit::tag_start($target,$token,'Plot Title');
624: my $text=&Apache::lonxml::get_all_text("/title",$parser);
625: $result.=&Apache::edit::end_row().
626: &Apache::edit::start_spanning_row().
627: &Apache::edit::editline('',$text,'',60);
628: } elsif ($target eq 'modified') {
629: my $text=$$parser[-1]->get_text("/title");
630: $result.=&Apache::edit::rebuild_tag($token);
631: $result.=&Apache::edit::modifiedfield($token);
632: }
633: return $result;
634: }
635:
636: sub end_title {
637: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
638: my $result = '';
639: if ($target eq 'web' || $target eq 'tex') {
640: } elsif ($target eq 'edit') {
641: $result.=&Apache::edit::tag_end($target,$token);
642: }
643: return $result;
644: }
645: ##------------------------------------------------------------------- xlabel
646: sub start_xlabel {
647: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
648: my $result='';
649: if ($target eq 'web' || $target eq 'tex') {
650: $xlabel = &Apache::lonxml::get_all_text("/xlabel",$parser);
651: $xlabel=&Apache::run::evaluate($xlabel,$safeeval,$$parstack[-1]);
652: $xlabel =~ s/\n/ /g;
653: if (length($xlabel) > $max_str_len) {
654: $xlabel = substr($xlabel,0,$max_str_len);
655: }
656: } elsif ($target eq 'edit') {
657: $result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
658: my $text=&Apache::lonxml::get_all_text("/xlabel",$parser);
659: $result.=&Apache::edit::end_row().
660: &Apache::edit::start_spanning_row().
661: &Apache::edit::editline('',$text,'',60);
662: } elsif ($target eq 'modified') {
663: my $text=$$parser[-1]->get_text("/xlabel");
664: $result.=&Apache::edit::rebuild_tag($token);
665: $result.=&Apache::edit::modifiedfield($token);
666: }
667: return $result;
668: }
669:
670: sub end_xlabel {
671: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
672: my $result = '';
673: if ($target eq 'web' || $target eq 'tex') {
674: } elsif ($target eq 'edit') {
675: $result.=&Apache::edit::tag_end($target,$token);
676: }
677: return $result;
678: }
679:
680: ##------------------------------------------------------------------- ylabel
681: sub start_ylabel {
682: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
683: my $result='';
684: if ($target eq 'web' || $target eq 'tex') {
685: $ylabel = &Apache::lonxml::get_all_text("/ylabel",$parser);
686: $ylabel = &Apache::run::evaluate($ylabel,$safeeval,$$parstack[-1]);
687: $ylabel =~ s/\n/ /g;
688: if (length($ylabel) > $max_str_len) {
689: $ylabel = substr($ylabel,0,$max_str_len);
690: }
691: } elsif ($target eq 'edit') {
692: $result .= &Apache::edit::tag_start($target,$token,'Plot Ylabel');
693: my $text = &Apache::lonxml::get_all_text("/ylabel",$parser);
694: $result .= &Apache::edit::end_row().
695: &Apache::edit::start_spanning_row().
696: &Apache::edit::editline('',$text,'',60);
697: } elsif ($target eq 'modified') {
698: my $text=$$parser[-1]->get_text("/ylabel");
699: $result.=&Apache::edit::rebuild_tag($token);
700: $result.=&Apache::edit::modifiedfield($token);
701: }
702: return $result;
703: }
704:
705: sub end_ylabel {
706: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
707: my $result = '';
708: if ($target eq 'web' || $target eq 'tex') {
709: } elsif ($target eq 'edit') {
710: $result.=&Apache::edit::tag_end($target,$token);
711: }
712: return $result;
713: }
714:
715: ##------------------------------------------------------------------- label
716: sub start_label {
717: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
718: my $result='';
719: if ($target eq 'web' || $target eq 'tex') {
720: my %label;
721: &get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
722: $tagstack->[-1]);
723: my $text = &Apache::lonxml::get_all_text("/label",$parser);
724: $text = &Apache::run::evaluate($text,$safeeval,$$parstack[-1]);
725: $text =~ s/\n/ /g;
726: $text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
727: $label{'text'} = $text;
728: push(@labels,\%label);
729: } elsif ($target eq 'edit') {
730: $result .= &Apache::edit::tag_start($target,$token,'Plot Label');
731: $result .= &edit_attributes($target,$token,\%label_defaults);
732: my $text = &Apache::lonxml::get_all_text("/label",$parser);
733: $result .= &Apache::edit::end_row().
734: &Apache::edit::start_spanning_row().
735: &Apache::edit::editline('',$text,'',60);
736: } elsif ($target eq 'modified') {
737: &Apache::edit::get_new_args
738: ($token,$parstack,$safeeval,keys(%label_defaults));
739: $result.=&Apache::edit::rebuild_tag($token);
740: my $text=$$parser[-1]->get_text("/label");
741: $result.=&Apache::edit::modifiedfield($token);
742: }
743: return $result;
744: }
745:
746: sub end_label {
747: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
748: my $result = '';
749: if ($target eq 'web' || $target eq 'tex') {
750: } elsif ($target eq 'edit') {
751: $result.=&Apache::edit::tag_end($target,$token);
752: }
753: return $result;
754: }
755:
756: ##------------------------------------------------------------------- curve
757: sub start_curve {
758: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
759: my $result='';
760: &Apache::lonxml::register('Apache::lonplot',('function','data'));
761: push (@Apache::lonxml::namespace,'curve');
762: if ($target eq 'web' || $target eq 'tex') {
763: my %curve;
764: &get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
765: $tagstack->[-1]);
766: push (@curves,\%curve);
767: } elsif ($target eq 'edit') {
768: $result .= &Apache::edit::tag_start($target,$token,'Curve');
769: $result .= &help_win($curve_help_text);
770: $result .= &edit_attributes($target,$token,\%curve_defaults,
771: \@curve_edit_order);
772: } elsif ($target eq 'modified') {
773: my $constructtag=&Apache::edit::get_new_args
774: ($token,$parstack,$safeeval,keys(%curve_defaults));
775: if ($constructtag) {
776: $result = &Apache::edit::rebuild_tag($token);
777: $result.= &Apache::edit::handle_insert();
778: }
779: }
780: return $result;
781: }
782:
783: sub end_curve {
784: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
785: my $result = '';
786: pop @Apache::lonxml::namespace;
787: &Apache::lonxml::deregister('Apache::lonplot',('function','data'));
788: if ($target eq 'web' || $target eq 'tex') {
789: } elsif ($target eq 'edit') {
790: $result.=&Apache::edit::tag_end($target,$token);
791: }
792: return $result;
793: }
794:
795: ##------------------------------------------------------------ curve function
796: sub start_function {
797: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
798: my $result='';
799: if ($target eq 'web' || $target eq 'tex') {
800: if (exists($curves[-1]->{'data'})) {
801: &Apache::lonxml::warning('Use of <function> precludes use of <data>. The <data> will be omitted in favor of the <function> declaration.');
802: delete $curves[-1]->{'data'} ;
803: }
804: my $function = &Apache::lonxml::get_all_text("/function",$parser);
805: $function = &Apache::run::evaluate($function,$safeeval,$$parstack[-1]);
806: $curves[-1]->{'function'} = $function;
807: } elsif ($target eq 'edit') {
808: $result .= &Apache::edit::tag_start($target,$token,'Gnuplot compatible curve function');
809: my $text = &Apache::lonxml::get_all_text("/function",$parser);
810: $result .= &Apache::edit::end_row().
811: &Apache::edit::start_spanning_row().
812: &Apache::edit::editline('',$text,'',60);
813: } elsif ($target eq 'modified') {
814: $result.=&Apache::edit::rebuild_tag($token);
815: my $text=$$parser[-1]->get_text("/function");
816: $result.=&Apache::edit::modifiedfield($token);
817: }
818: return $result;
819: }
820:
821: sub end_function {
822: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
823: my $result = '';
824: if ($target eq 'web' || $target eq 'tex') {
825: } elsif ($target eq 'edit') {
826: $result .= &Apache::edit::end_table();
827: }
828: return $result;
829: }
830:
831: ##------------------------------------------------------------ curve data
832: sub start_data {
833: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
834: my $result='';
835: if ($target eq 'web' || $target eq 'tex') {
836: if (exists($curves[-1]->{'function'})) {
837: &Apache::lonxml::warning('Use of <data> precludes use of .'.
838: '<function>. The <function> will be omitted in favor of '.
839: 'the <data> declaration.');
840: delete($curves[-1]->{'function'});
841: }
842: my $datatext = &Apache::lonxml::get_all_text("/data",$parser);
843: $datatext=&Apache::run::evaluate($datatext,$safeeval,$$parstack[-1]);
844: # Deal with cases where we're given an array...
845: if ($datatext =~ /^\@/) {
846: $datatext = &Apache::run::run('return "'.$datatext.'"',
847: $safeeval,1);
848: }
849: $datatext =~ s/\s+/ /g;
850: # Need to do some error checking on the @data array -
851: # make sure it's all numbers and make sure each array
852: # is of the same length.
853: my @data;
854: if ($datatext =~ /,/) { # comma deliminated
855: @data = split /,/,$datatext;
856: } else { # Assume it's space seperated.
857: @data = split / /,$datatext;
858: }
859: for (my $i=0;$i<=$#data;$i++) {
860: # Check that it's non-empty
861: if (! defined($data[$i])) {
862: &Apache::lonxml::warning(
863: 'undefined <data> value. Replacing with '.
864: ' pi/e = 1.15572734979092');
865: $data[$i] = 1.15572734979092;
866: }
867: # Check that it's a number
868: if (! &$real_test($data[$i]) & ! &$int_test($data[$i])) {
869: &Apache::lonxml::warning(
870: 'Bad <data> value of '.$data[$i].' Replacing with '.
871: ' pi/e = 1.15572734979092');
872: $data[$i] = 1.15572734979092;
873: }
874: }
875: # complain if the number of data points is not the same as
876: # in previous sets of data.
877: if (($curves[-1]->{'data'}) && ($#data != $#{@{$curves[-1]->{'data'}->[0]}})){
878: &Apache::lonxml::warning
879: ('Number of data points is not consistent with previous '.
880: 'number of data points');
881: }
882: push @{$curves[-1]->{'data'}},\@data;
883: } elsif ($target eq 'edit') {
884: $result .= &Apache::edit::tag_start($target,$token,'Comma or space deliminated curve data');
885: my $text = &Apache::lonxml::get_all_text("/data",$parser);
886: $result .= &Apache::edit::end_row().
887: &Apache::edit::start_spanning_row().
888: &Apache::edit::editline('',$text,'',60);
889: } elsif ($target eq 'modified') {
890: $result.=&Apache::edit::rebuild_tag($token);
891: my $text=$$parser[-1]->get_text("/data");
892: $result.=&Apache::edit::modifiedfield($token);
893: }
894: return $result;
895: }
896:
897: sub end_data {
898: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
899: my $result = '';
900: if ($target eq 'web' || $target eq 'tex') {
901: } elsif ($target eq 'edit') {
902: $result .= &Apache::edit::end_table();
903: }
904: return $result;
905: }
906:
907: ##------------------------------------------------------------------- axis
908: sub start_axis {
909: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
910: my $result='';
911: if ($target eq 'web' || $target eq 'tex') {
912: &get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
913: $tagstack->[-1]);
914: } elsif ($target eq 'edit') {
915: $result .= &Apache::edit::tag_start($target,$token,'Plot Axes');
916: $result .= &edit_attributes($target,$token,\%axis_defaults,
917: \@axis_edit_order);
918: } elsif ($target eq 'modified') {
919: my $constructtag=&Apache::edit::get_new_args
920: ($token,$parstack,$safeeval,keys(%axis_defaults));
921: if ($constructtag) {
922: $result = &Apache::edit::rebuild_tag($token);
923: }
924: }
925: return $result;
926: }
927:
928: sub end_axis {
929: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
930: my $result = '';
931: if ($target eq 'web' || $target eq 'tex') {
932: } elsif ($target eq 'edit') {
933: $result.=&Apache::edit::tag_end($target,$token);
934: } elsif ($target eq 'modified') {
935: }
936: return $result;
937: }
938:
939: ###################################################################
940: ## ##
941: ## Utility Functions ##
942: ## ##
943: ###################################################################
944:
945: ##----------------------------------------------------------- set_defaults
946: sub set_defaults {
947: my ($var,$defaults) = @_;
948: my $key;
949: foreach $key (keys(%$defaults)) {
950: $var->{$key} = $defaults->{$key}->{'default'};
951: }
952: }
953:
954: ##------------------------------------------------------------------- misc
955: sub get_attributes{
956: my ($values,$defaults,$parstack,$safeeval,$tag) = @_;
957: foreach my $attr (keys(%{$defaults})) {
958: $values->{$attr} =
959: &Apache::lonxml::get_param($attr,$parstack,$safeeval);
960: if ($values->{$attr} eq '' | !defined($values->{$attr})) {
961: $values->{$attr} = $defaults->{$attr}->{'default'};
962: next;
963: }
964: my $test = $defaults->{$attr}->{'test'};
965: if (! &$test($values->{$attr})) {
966: &Apache::lonxml::warning
967: ($tag.':'.$attr.': Bad value.'.'Replacing your value with : '
968: .$defaults->{$attr}->{'default'} );
969: $values->{$attr} = $defaults->{$attr}->{'default'};
970: }
971: }
972: return ;
973: }
974:
975: ##------------------------------------------------------- write_gnuplot_file
976: sub write_gnuplot_file {
977: my ($tmpdir,$filename,$target)= @_;
978: my $gnuplot_input = '';
979: my $curve;
980: # Collect all the colors
981: my @Colors;
982: push @Colors, $plot{'bgcolor'};
983: push @Colors, $plot{'fgcolor'};
984: push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});
985: foreach $curve (@curves) {
986: push @Colors, ($curve->{'color'} ne '' ?
987: $curve->{'color'} :
988: $plot{'fgcolor'} );
989: }
990: # set term
991: if ($target eq 'web') {
992: $gnuplot_input .= 'set term gif ';
993: $gnuplot_input .= 'transparent ' if ($plot{'transparent'} eq 'on');
994: $gnuplot_input .= $plot{'font'} . ' ';
995: $gnuplot_input .= 'size '.$plot{'width'}.','.$plot{'height'}.' ';
996: $gnuplot_input .= "@Colors\n";
997: # set output
998: $gnuplot_input .= "set output\n";
999: } elsif ($target eq 'tex') {
1000: $gnuplot_input .= "set term postscript eps monochrome solid\n";
1001: $gnuplot_input .= "set output \"/home/httpd/perl/tmp/".
1002: &Apache::lonnet::unescape($filename).".eps\"\n";
1003: }
1004: # grid
1005: $gnuplot_input .= 'set grid'.$/ if ($plot{'grid'} eq 'on');
1006: # border
1007: $gnuplot_input .= ($plot{'border'} eq 'on'?
1008: 'set border'.$/ :
1009: 'set noborder'.$/ );
1010: # sampling rate for non-data curves
1011: $gnuplot_input .= "set samples $plot{'samples'}\n";
1012: # title, xlabel, ylabel
1013: # titles
1014: $gnuplot_input .= "set title \"$title\"\n" if (defined($title)) ;
1015: $gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
1016: $gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
1017: # tics
1018: if (%xtics) {
1019: $gnuplot_input .= "set xtics $xtics{'location'} ";
1020: $gnuplot_input .= ( $xtics{'mirror'} eq 'on'?"mirror ":"nomirror ");
1021: $gnuplot_input .= "$xtics{'start'}, ";
1022: $gnuplot_input .= "$xtics{'increment'}, ";
1023: $gnuplot_input .= "$xtics{'end'}\n";
1024: }
1025: if (%ytics) {
1026: $gnuplot_input .= "set ytics $ytics{'location'} ";
1027: $gnuplot_input .= ( $ytics{'mirror'} eq 'on'?"mirror ":"nomirror ");
1028: $gnuplot_input .= "$ytics{'start'}, ";
1029: $gnuplot_input .= "$ytics{'increment'}, ";
1030: $gnuplot_input .= "$ytics{'end'}\n";
1031: }
1032: # axis
1033: if (%axis) {
1034: $gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
1035: $gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
1036: }
1037: # Key
1038: if (%key) {
1039: $gnuplot_input .= 'set key '.$key{'pos'}.' ';
1040: if ($key{'title'} ne '') {
1041: $gnuplot_input .= 'title "'.$key{'title'}.'" ';
1042: }
1043: $gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;
1044: } else {
1045: $gnuplot_input .= 'set nokey'.$/;
1046: }
1047: # labels
1048: my $label;
1049: foreach $label (@labels) {
1050: $gnuplot_input .= 'set label "'.$label->{'text'}.'" at '.
1051: $label->{'xpos'}.','.$label->{'ypos'}.' '.$label->{'justify'}.$/ ;
1052: }
1053: if ($target eq 'tex') {
1054: $gnuplot_input .="set size 1,".$plot{'height'}/$plot{'width'}*1.38;
1055: $gnuplot_input .="\n";
1056: }
1057: # curves
1058: $gnuplot_input .= 'plot ';
1059: for (my $i = 0;$i<=$#curves;$i++) {
1060: $curve = $curves[$i];
1061: $gnuplot_input.= ', ' if ($i > 0);
1062: if (exists($curve->{'function'})) {
1063: $gnuplot_input.=
1064: $curve->{'function'}.' title "'.
1065: $curve->{'name'}.'" with '.
1066: $curve->{'linestyle'};
1067: $gnuplot_input.= ' linewidth 4 ' if ($target eq 'tex');
1068: if (($curve->{'linestyle'} eq 'points') ||
1069: ($curve->{'linestyle'} eq 'linespoints') ||
1070: ($curve->{'linestyle'} eq 'errorbars') ||
1071: ($curve->{'linestyle'} eq 'xerrorbars') ||
1072: ($curve->{'linestyle'} eq 'yerrorbars') ||
1073: ($curve->{'linestyle'} eq 'xyerrorbars')) {
1074: $gnuplot_input.=' pointtype '.$curve->{'pointtype'};
1075: $gnuplot_input.=' pointsize '.$curve->{'pointsize'};
1076: }
1077: } elsif (exists($curve->{'data'})) {
1078: # Store data values in $datatext
1079: my $datatext = '';
1080: # get new filename
1081: my $datafilename = "$tmpdir/$filename.data.$i";
1082: my $fh=Apache::File->new(">$datafilename");
1083: # Compile data
1084: my @Data = @{$curve->{'data'}};
1085: my @Data0 = @{$Data[0]};
1086: for (my $i =0; $i<=$#Data0; $i++) {
1087: my $dataset;
1088: foreach $dataset (@Data) {
1089: $datatext .= $dataset->[$i] . ' ';
1090: }
1091: $datatext .= $/;
1092: }
1093: # write file
1094: print $fh $datatext;
1095: close ($fh);
1096: # generate gnuplot text
1097: $gnuplot_input.= '"'.$datafilename.'" title "'.
1098: $curve->{'name'}.'" with '.
1099: $curve->{'linestyle'};
1100: $gnuplot_input.= ' linewidth 4 ' if ($target eq 'tex');
1101: if (($curve->{'linestyle'} eq 'points') ||
1102: ($curve->{'linestyle'} eq 'linespoints') ||
1103: ($curve->{'linestyle'} eq 'errorbars') ||
1104: ($curve->{'linestyle'} eq 'xerrorbars') ||
1105: ($curve->{'linestyle'} eq 'yerrorbars') ||
1106: ($curve->{'linestyle'} eq 'xyerrorbars')) {
1107: $gnuplot_input.=' pointtype '.$curve->{'pointtype'};
1108: $gnuplot_input.=' pointsize '.$curve->{'pointsize'};
1109: }
1110: }
1111: }
1112: # Write the output to a file.
1113: my $fh=Apache::File->new(">$tmpdir$filename.data");
1114: print $fh $gnuplot_input;
1115: close($fh);
1116: # That's all folks.
1117: return ;
1118: }
1119:
1120: #---------------------------------------------- check_inputs
1121: sub check_inputs {
1122: ## Note: no inputs, no outputs - this acts only on global variables.
1123: ## Make sure we have all the input we need:
1124: if (! %plot) { &set_defaults(\%plot,\%gnuplot_defaults); }
1125: if (! %key ) {} # No key for this plot, thats okay
1126: # if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
1127: if (! defined($title )) {} # No title for this plot, thats okay
1128: if (! defined($xlabel)) {} # No xlabel for this plot, thats okay
1129: if (! defined($ylabel)) {} # No ylabel for this plot, thats okay
1130: if ($#labels < 0) { } # No labels for this plot, thats okay
1131: if ($#curves < 0) {
1132: &Apache::lonxml::warning("No curves specified for plot!!!!");
1133: return '';
1134: }
1135: my $curve;
1136: foreach $curve (@curves) {
1137: if (!defined($curve->{'function'})&&!defined($curve->{'data'})){
1138: &Apache::lonxml::warning("One of the curves specified did not contain any <data> or <function> declarations\n");
1139: return '';
1140: }
1141: }
1142: }
1143:
1144: #------------------------------------------------ make_edit
1145: sub edit_attributes {
1146: my ($target,$token,$defaults,$keys) = @_;
1147: my ($result,@keys);
1148: if ($keys && ref($keys) eq 'ARRAY') {
1149: @keys = @$keys;
1150: } else {
1151: @keys = sort(keys(%$defaults));
1152: }
1153: foreach my $attr (@keys) {
1154: # append a ' ' to the description if it doesn't have one already.
1155: my $description = $defaults->{$attr}->{'description'};
1156: $description .= ' ' if ($description !~ / $/);
1157: if ($defaults->{$attr}->{'edit_type'} eq 'entry') {
1158: $result .= &Apache::edit::text_arg
1159: ($description,$attr,$token,
1160: $defaults->{$attr}->{'size'});
1161: } elsif ($defaults->{$attr}->{'edit_type'} eq 'choice') {
1162: $result .= &Apache::edit::select_arg
1163: ($description,$attr,$defaults->{$attr}->{'choices'},$token);
1164: } elsif ($defaults->{$attr}->{'edit_type'} eq 'onoff') {
1165: $result .= &Apache::edit::select_arg
1166: ($description,$attr,['on','off'],$token);
1167: }
1168: $result .= '<br />';
1169: }
1170: return $result;
1171: }
1172:
1173:
1174: ###################################################################
1175: ## ##
1176: ## Insertion functions for editing plots ##
1177: ## ##
1178: ###################################################################
1179:
1180: sub insert_gnuplot {
1181: my $result = '';
1182: # plot attributes
1183: $result .= "\n<gnuplot ";
1184: foreach my $attr (keys(%gnuplot_defaults)) {
1185: $result .= "\n $attr=\"$gnuplot_defaults{$attr}->{'default'}\"";
1186: }
1187: $result .= ">";
1188: # Add the components (most are commented out for simplicity)
1189: # $result .= &insert_key();
1190: # $result .= &insert_axis();
1191: # $result .= &insert_title();
1192: # $result .= &insert_xlabel();
1193: # $result .= &insert_ylabel();
1194: $result .= &insert_curve();
1195: # close up the <gnuplot>
1196: $result .= "\n</gnuplot>";
1197: return $result;
1198: }
1199:
1200: sub insert_tics {
1201: my $result;
1202: $result .= &insert_xtics() . &insert_ytics;
1203: return $result;
1204: }
1205:
1206: sub insert_xtics {
1207: my $result;
1208: $result .= "\n <xtics ";
1209: foreach my $attr (keys(%tic_defaults)) {
1210: $result .= "\n $attr=\"$tic_defaults{$attr}->{'default'}\" ";
1211: }
1212: $result .= "/>";
1213: return $result;
1214: }
1215:
1216: sub insert_ytics {
1217: my $result;
1218: $result .= "\n <ytics ";
1219: foreach my $attr (keys(%tic_defaults)) {
1220: $result .= "\n $attr=\"$tic_defaults{$attr}->{'default'}\" ";
1221: }
1222: $result .= "/>";
1223: return $result;
1224: }
1225:
1226: sub insert_key {
1227: my $result;
1228: $result .= "\n <key ";
1229: foreach my $attr (keys(%key_defaults)) {
1230: $result .= "\n $attr=\"$key_defaults{$attr}->{'default'}\"";
1231: }
1232: $result .= " />";
1233: return $result;
1234: }
1235:
1236: sub insert_axis{
1237: my $result;
1238: $result .= "\n <axis ";
1239: foreach my $attr (keys(%axis_defaults)) {
1240: $result .= "\n $attr=\"$axis_defaults{$attr}->{'default'}\"";
1241: }
1242: $result .= " />";
1243: return $result;
1244: }
1245:
1246: sub insert_title { return "\n <title></title>"; }
1247: sub insert_xlabel { return "\n <xlabel></xlabel>"; }
1248: sub insert_ylabel { return "\n <ylabel></ylabel>"; }
1249:
1250: sub insert_label {
1251: my $result;
1252: $result .= "\n <label ";
1253: foreach my $attr (keys(%label_defaults)) {
1254: $result .= "\n $attr=\"".
1255: $label_defaults{$attr}->{'default'}."\"";
1256: }
1257: $result .= "></label>";
1258: return $result;
1259: }
1260:
1261: sub insert_curve {
1262: my $result;
1263: $result .= "\n <curve ";
1264: foreach my $attr (keys(%curve_defaults)) {
1265: $result .= "\n $attr=\"".
1266: $curve_defaults{$attr}->{'default'}."\"";
1267: }
1268: $result .= " >";
1269: $result .= &insert_data().&insert_data()."\n </curve>";
1270: }
1271:
1272: sub insert_function {
1273: my $result;
1274: $result .= "\n <function></function>";
1275: return $result;
1276: }
1277:
1278: sub insert_data {
1279: my $result;
1280: $result .= "\n <data></data>";
1281: return $result;
1282: }
1283:
1284: ##----------------------------------------------------------------------
1285: # Javascript functions to display help for tags
1286:
1287: sub make_javascript {
1288: my $helpwindowwidth = 400;
1289: my $helpwindowheight = 400;
1290: my $result = '';
1291: $result.=<<"ENDFUNCTION";
1292: <script language="JavaScript">
1293: function openWin(text)
1294: {
1295: newWin = open("", "new_W", "width=$helpwindowwidth,height=$helpwindowheight,resizable=1,scrollbars=1");
1296: newWin.document.open("text/html", "replace");
1297: newWin.document.writeln(text);
1298: newWin.document.writeln('<center><a href=\"javascript:window.close()\">close this window</a></center>');
1299: newWin.document.close();
1300: }
1301: </script>
1302: ENDFUNCTION
1303: return $result;
1304: }
1305:
1306: sub help_win {
1307: my ($helptext)=@_;
1308: $helptext =~ s/\n/ /g;
1309: $helptext =~ s/\'/\\\'/g;
1310: my $result = '';
1311: $result.=<<"ENDWIN";
1312: <table width="100%"><tr><td align="right">
1313: <a href="javascript:openWin('$helptext')">help</a>
1314: </td></tr></table><hr />
1315: ENDWIN
1316: return $result;
1317: }
1318: ##----------------------------------------------------------------------
1319: 1;
1320: __END__
1321:
1322:
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