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[LON-CAPA] /
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homework /
drawimage.pm
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1.11:
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Fri Apr 5 02:31:23 2024 UTC (8 weeks, 1 day ago) by
raeburn
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- Add rotation attribute to text tag for drawimage. Rotation value is the
number of degrees to rotate the text, relative to the horizontal.
- Only used if font attribute is set to freetype font (e.g., helvetica 12).
- If set to a valid value will override the value for direction attribute.
1: # The LearningOnline Network with CAPA
2: # programatic image drawing
3: #
4: # $Id: drawimage.pm,v 1.11 2024/04/05 02:31:23 raeburn Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28:
29: package Apache::drawimage;
30: use strict;
31: use Apache::loncommon;
32: use lib '/home/httpd/lib/perl/';
33: use LONCAPA;
34:
35:
36: my %args;
37: my $cgi_id;
38: my @cgi_ids;
39: BEGIN {
40: &Apache::lonxml::register('Apache::drawimage',('drawimage'));
41: }
42:
43: sub start_drawimage {
44: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
45: &Apache::lonxml::register('Apache::drawimage',('text','line','rectangle','arc','fill','polygon','image'));
46: if ($target eq 'web' || $target eq 'tex') {
47: my $new_id=&Apache::loncommon::get_cgi_id();
48: if ($cgi_id) { push(@cgi_ids,$cgi_id); } else { undef(%args); }
49: $cgi_id=$new_id;
50: }
51: return '';
52: }
53:
54: sub end_drawimage {
55: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
56: my $result;
57: if ($target eq 'web' || $target eq 'tex') {
58: my $width = &Apache::lonxml::get_param('width',$parstack,$safeeval);
59: my $height =&Apache::lonxml::get_param('height',$parstack,$safeeval);
60: my $bgcolor =&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
61: if (!$width) { $width=300; }
62: if (!$height) { $height=300; }
63: $result.="<img width='$width' height='$height'
64: src='/adm/randomlabel.png?token=$cgi_id' />\n";
65: $args{"cgi.$cgi_id.SIZE"}=join(':',($width,$height));
66: $args{"cgi.$cgi_id.BGCOLOR"}=join(':',($bgcolor));
67: &Apache::lonnet::appenv(\%args);
68: if (@cgi_ids) {
69: $cgi_id=pop(@cgi_ids);
70: } else {
71: undef($cgi_id);
72: }
73: } elsif ($target eq 'edit') {
74: } elsif ($target eq 'modified') {
75: }
76:
77: &Apache::lonxml::register('Apache::drawimage',
78: ('text','line','rectangle','arc','fill',
79: 'polygon'));
80: return $result;
81: }
82:
83: sub start_text {
84: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
85: my $result;
86: if ($target eq 'web' || $target eq 'tex') {
87: &Apache::lonxml::startredirection();
88: }
89: return $result;
90: }
91:
92: sub end_text {
93: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
94: my $result;
95: if ($target eq 'web' || $target eq 'tex') {
96: my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
97: my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
98: my $font = &Apache::lonxml::get_param('font',$parstack,$safeeval);
99: my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
100: my $direction = &Apache::lonxml::get_param('direction',$parstack,$safeeval);
101: my $rotation = &Apache::lonxml::get_param('rotation',$parstack,$safeeval);
102: my $text = &Apache::lonxml::endredirection();
103: $text = &escape($text);
104: $args{"cgi.$cgi_id.OBJTYPE"}.='LABEL:';
105: my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
106: $args{"cgi.$cgi_id.OBJ$i"}=join(':',($x,$y,$text,$font,$color,$direction,$rotation));
107: }
108: return $result;
109: }
110:
111: sub start_line {
112: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
113: my $result;
114: if ($target eq 'web' || $target eq 'tex') {
115: my $x1 = &Apache::lonxml::get_param('x1',$parstack,$safeeval);
116: my $y1 = &Apache::lonxml::get_param('y1',$parstack,$safeeval);
117: my $x2 = &Apache::lonxml::get_param('x2',$parstack,$safeeval);
118: my $y2 = &Apache::lonxml::get_param('y2',$parstack,$safeeval);
119: my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
120: my $thickness = &Apache::lonxml::get_param('thickness',$parstack,$safeeval);
121: my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
122: $args{"cgi.$cgi_id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,$color,$thickness));
123: $args{"cgi.$cgi_id.OBJTYPE"}.='LINE:';
124: }
125: return $result;
126: }
127:
128: sub end_line {
129: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
130: my $result;
131: return $result;
132: }
133:
134: sub start_rectangle {
135: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
136: my $result;
137: if ($target eq 'web' || $target eq 'tex') {
138: my $x1 = &Apache::lonxml::get_param('x1',$parstack,$safeeval);
139: my $y1 = &Apache::lonxml::get_param('y1',$parstack,$safeeval);
140: my $x2 = &Apache::lonxml::get_param('x2',$parstack,$safeeval);
141: my $y2 = &Apache::lonxml::get_param('y2',$parstack,$safeeval);
142: my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
143: my $thickness = &Apache::lonxml::get_param('thickness',$parstack,
144: $safeeval);
145: my $filled = &Apache::lonxml::get_param('filled',$parstack,
146: $safeeval);
147: my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
148: $args{"cgi.$cgi_id.OBJ$i"}=
149: join(':',($x1,$y1,$x2,$y2,$color,$thickness,$filled));
150: $args{"cgi.$cgi_id.OBJTYPE"}.='RECTANGLE:';
151: }
152: return $result;
153: }
154:
155: sub end_rectangle {
156: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
157: my $result;
158: return $result;
159: }
160:
161: sub start_arc {
162: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
163: my $result;
164: if ($target eq 'web' || $target eq 'tex') {
165: my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
166: my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
167: my $width = &Apache::lonxml::get_param('width',$parstack,$safeeval);
168: my $height = &Apache::lonxml::get_param('height',$parstack,$safeeval);
169: my $start = &Apache::lonxml::get_param('start',$parstack,$safeeval);
170: my $end = &Apache::lonxml::get_param('end',$parstack,$safeeval);
171: my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
172: my $thickness = &Apache::lonxml::get_param('thickness',$parstack,$safeeval);
173: my $filled = &Apache::lonxml::get_param('filled',$parstack,$safeeval);
174: my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
175: $args{"cgi.$cgi_id.OBJ$i"}=
176: join(':',($x,$y,$width,$height,$start,$end,$color,$thickness,
177: $filled));
178: $args{"cgi.$cgi_id.OBJTYPE"}.='ARC:';
179: }
180: return $result;
181: }
182:
183: sub end_arc {
184: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
185: my $result;
186: return $result;
187: }
188:
189: sub start_fill {
190: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
191: my $result;
192: if ($target eq 'web' || $target eq 'tex') {
193: my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
194: my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
195: my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
196: my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
197: $args{"cgi.$cgi_id.OBJ$i"}=join(':',($x,$y,$color));
198: $args{"cgi.$cgi_id.OBJTYPE"}.='FILL:';
199: }
200: return $result;
201: }
202:
203: sub end_fill {
204: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
205: my $result;
206: return $result;
207: }
208:
209: my @polygon;
210: sub start_polygon {
211: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
212: my $result;
213: &Apache::lonxml::register('Apache::drawimage',('point'));
214: if ($target eq 'web') {
215: undef(@polygon);
216: }
217: return $result;
218: }
219:
220: sub end_polygon {
221: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
222: my $result;
223: if ($target eq 'web') {
224: my $color=&Apache::lonxml::get_param('color',$parstack,$safeeval);
225: my $filled=&Apache::lonxml::get_param('filled',$parstack,$safeeval);
226: my $open=&Apache::lonxml::get_param('open',$parstack,$safeeval);
227: my $thickness = &Apache::lonxml::get_param('thickness',$parstack,
228: $safeeval);
229: my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
230: $args{"cgi.$cgi_id.OBJTYPE"}.='POLYGON:';
231: $args{"cgi.$cgi_id.OBJ$i"}=join(':',($color,$thickness,$open,$filled));
232: $args{"cgi.$cgi_id.OBJEXTRA$i"}=join('-',@polygon);
233: }
234: &Apache::lonxml::deregister('Apache::drawimage',('point'));
235: return $result;
236: }
237:
238: sub start_point {
239: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
240: my $result;
241: if ($target eq 'web') {
242: my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
243: my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
244: push (@polygon,"($x,$y)");
245: }
246: return $result;
247: }
248:
249: sub end_point {
250: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
251: my $result;
252: return $result;
253: }
254:
255: sub start_image {
256: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
257: my $result;
258: if ($target eq 'web' || $target eq 'tex') {
259: &Apache::lonxml::startredirection();
260: }
261: return $result;
262: }
263:
264: sub end_image {
265: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
266: my $result;
267: if ($target eq 'web' || $target eq 'tex') {
268: my $bgimg=&Apache::lonxml::endredirection();
269: my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
270: my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
271: my $clipx = &Apache::lonxml::get_param('clipx',$parstack,$safeeval);
272: my $clipy = &Apache::lonxml::get_param('clipy',$parstack,$safeeval);
273: my $clipwidth =
274: &Apache::lonxml::get_param('clipwidth',$parstack,$safeeval);
275: my $clipheight =
276: &Apache::lonxml::get_param('clipheight',$parstack,$safeeval);
277: my $scaledwidth =
278: &Apache::lonxml::get_param('scaledwidth',$parstack,$safeeval);
279: my $scaledheight =
280: &Apache::lonxml::get_param('scaledheight',$parstack,$safeeval);
281: my $transparent =
282: &Apache::lonxml::get_param('transparent',$parstack,$safeeval);
283: $bgimg=&Apache::imageresponse::clean_up_image($bgimg);
284: my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
285: $args{"cgi.$cgi_id.OBJTYPE"}.='IMAGE:';
286: $args{"cgi.$cgi_id.OBJ$i"} =
287: join(':',($x,$y,&escape($bgimg),$transparent,
288: $clipx,$clipy,$scaledwidth,$scaledheight,$clipwidth,$clipheight));
289: }
290: return $result;
291: }
292: 1;
293: __END__
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