1: # The LearningOnline Network with CAPA
2: # Dynamic plot
3: #
4: # $Id: lonplot.pm,v 1.3 2001/12/18 16:06:01 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: # 12/18 Matthew
30: package Apache::lonplot;
31: use strict;
32: use Apache::response;
33: use Apache::lonxml;
34: use Digest::MD5 qw(md5 md5_hex md5_base64);
35:
36: sub BEGIN {
37: &Apache::lonxml::register('Apache::lonplot',('plot'));
38: }
39:
40:
41: ##
42: ## Tests used in checking the validitity of input
43: ##
44: my $int_test = sub {$_[0]=~/^\d+$/};
45: my $real_test = sub {$_[0]=~/^[+-]?\d*\.?\d*$/};
46: my $color_test = sub {$_[0]=~/^x[\da-f]{6}$/};
47: my $onoff_test = sub {$_[0]=~/^(on|off)$/};
48: my $key_pos_test = sub {$_[0]=~/^(top|bottom|right|left|outside|below)+$/};
49: my $sml_test = sub {$_[0]=~/^(small|medium|large)$/};
50: my $linestyle_test = sub {$_[0]=~/^(lines|linespoints|dots|points|steps)$/};
51:
52: ##
53: ## Default values for attributes of elements
54: ##
55: my %plot_defaults =
56: (
57: height => {default => 200, test => $int_test },
58: width => {default => 200, test => $int_test },
59: bgcolor => {default => "xffffff", test => $color_test},
60: fgcolor => {default => "x000000", test => $color_test},
61: transparent => {default => "off", test => $onoff_test},
62: grid => {default => "off", test => $onoff_test},
63: border => {default => "on" , test => $onoff_test},
64: font => {default => "medium", test => $sml_test }
65: );
66:
67: my %key_defaults =
68: (
69: title => { default => "on" , test => $onoff_test },
70: box => { default => "off" , test => $onoff_test },
71: pos => { default => "top right" , test => $key_pos_test}
72: );
73:
74: my %label_defaults =
75: (
76: xpos => {default => 0, test => $real_test },
77: ypos => {default => 0, test => $real_test },
78: color => {default => "x000000", test => $color_test },
79: justify => {default => "left",
80: test => sub {$_[0]=~/^(left|right|center)$/}}
81: );
82:
83: my %axis_defaults =
84: (
85: color => {default => "x000000", test => $color_test},
86: thickness => {default => 1, test => $int_test },
87: xmin => {default => -10.0, test => $real_test },
88: xmax => {default => 10.0, test => $real_test },
89: ymin => {default => -10.0, test => $real_test },
90: ymax => {default => 10.0, test => $real_test }
91: );
92:
93: my %curve_defaults =
94: (
95: color => {default => "x000000", test => $color_test },
96: name => {default => "x000000", test => sub {$_[0]=~/^[\w ]*$/} },
97: linestyle => {default => "lines", test => $linestyle_test }
98: );
99:
100: ##
101: ## End of defaults
102: ##
103: my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves);
104:
105: sub start_plot {
106: %plot = ''; %key=''; %axis='';
107: $title=''; $xlabel=''; $ylabel='';
108: @labels = ''; @curves='';
109:
110: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
111: my $result='';
112: &Apache::lonxml::register('Apache::plot',
113: ('title','xlabel','ylabel','key','axis','label','curve'));
114: push (@Apache::lonxml::namespace,'plot');
115: ##-------------------------------------------------------
116: ## How do I do this? I need to "eval" and I need to keep the info
117: ## available for the parser.
118: ##
119: my $inside = &Apache::lonxml::get_all_text("/plot",$$parser[-1]);
120: my $eval=&Apache::lonxml::get_param('eval',$parstack,$safeeval);
121: if ($eval eq 'on') {
122: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
123: #&Apache::lonxml::debug("M is evaulated to:$inside:");
124: }
125: ##-------------------------------------------------------
126: &get_attributes(\%plot,\%plot_defaults,$parstack,$safeeval,'plot');
127: return '';
128: }
129:
130: sub end_plot {
131: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
132: pop @Apache::lonxml::namespace;
133: my $result;
134: ## Determine filename
135: my $tmpdir = '/home/httpd/perl/tmp/';
136: my $filename = $tmpdir.$ENV{'user.name'}.'_'.$ENV{'user.domain'}.
137: '_plot.data';
138: my $usersees=md5_base64($filename.'_'.$ENV{'REMOTE_ADDR'});
139:
140: ## Write the plot description to the file
141: my $fh=&Apache::File->new('/home/httpd/perl/tmp/'.$realname);
142: ## Ack!
143: ## return image tag for the plot
144: $result = '<img src=\"/cgi-bin/plot.cgi?'.$usersees.'"';
145: return $result;
146: }
147:
148: ##----------------------------------------------------------------- key
149: sub start_key {
150: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
151: my $result='';
152: &get_attributes(\%key,\%key_defaults,$parstack,$safeeval,$tagstack);
153: return $result;
154: }
155:
156: sub end_key {
157: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
158: my $result = '';
159: return $result;
160: }
161: ##------------------------------------------------------------------- title
162: sub start_title {
163: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
164: $title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
165: my $result='';
166: return $result;
167: }
168:
169: sub end_title {
170: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
171: my $result = '';
172: return $result;
173: }
174: ##------------------------------------------------------------------- xlabel
175: sub start_xlabel {
176: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
177: my $result='';
178: $xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
179: return $result;
180: }
181:
182: sub end_xlabel {
183: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
184: my $result = '';
185: return $result;
186: }
187: ##------------------------------------------------------------------- ylabel
188: sub start_ylabel {
189: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
190: my $result='';
191: $ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
192: return $result;
193: }
194:
195: sub end_ylabel {
196: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
197: my $result = '';
198: return $result;
199: }
200: ##------------------------------------------------------------------- label
201: sub start_label {
202: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
203: my $result='';
204: my %label;
205: &get_attributes($label,\%label_defaults,$parstack,$safeeval,$tagstack);
206: $label->{'text'} = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
207: push(@labels,\%label);
208: return $result;
209: }
210:
211: sub end_label {
212: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
213: my $result = '';
214: return $result;
215: }
216:
217: ##------------------------------------------------------------------- curve
218: sub start_curve {
219: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
220: my $result='';
221: my %curve;
222: &get_attributes($curve,\%curve_defaults,$parstack,$safeeval,$tagstack);
223: push (@curves,$curve);
224:
225: &Apache::lonxml::register('Apache::plot',('function','data'));
226: push (@Apache::lonxml::namespace,'curve');
227:
228: return $result;
229: }
230:
231: sub end_curve {
232: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
233: my $result = '';
234: return $result;
235: }
236:
237: ##------------------------------------------------------------ curve function
238: sub start_function {
239: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
240: my $result='';
241:
242: $curves[-1]->{'function'} =
243: &Apache::lonxml::get_all_text("/function",$$parser[-1]);
244: return $result;
245: }
246:
247: sub end_function {
248: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
249: my $result = '';
250: return $result;
251: }
252:
253: ##------------------------------------------------------------ curve data
254: sub start_data {
255: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
256: my $result='';
257: push( @{$curves[-1]->{'data'}},
258: &Apache::lonxml::get_all_text("/data",$$parser[-1]));
259: return $result;
260: }
261:
262: sub end_data {
263: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
264: my $result = '';
265: return $result;
266: }
267:
268: ##------------------------------------------------------------------- axis
269: sub start_axis {
270: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
271: my $result='';
272: &get_attributes(\%axis,\%label_defaults,$parstack,$safeeval,$tagstack);
273: return $result;
274: }
275:
276: sub end_axis {
277: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
278: my $result = '';
279: return $result;
280: }
281:
282: ##------------------------------------------------------------------- misc
283: sub get_attributes{
284: %values = %{shift};
285: %defaults = %{shift};
286: $parstack = shift;
287: $safeeval = shift;
288: $tag = shift;
289: my $attr;
290: foreach $attr (keys %defaults) {
291: $values{$attr} = &Apache::lonxml::get_param($attr,$parstack,$safeeval);
292: my $test = $defaults{$attr}->{'test'};
293: if (! &$test($values{$attr})) {
294: &Apache::lonxml::warning($tag.':'.$attr.': Bad value. Replacing your value with : '.$defaults{$attr});
295: $values{$attr} = $defaults{$attr};
296: }
297: return ;
298: }
299:
300: 1;
301: __END__
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