Annotation of loncom/homework/randomlylabel.pm, revision 1.23
1.1 albertel 1: #!/usr/bin/perl
2: # The LearningOnline Network with CAPA
3: # randomlabel.png: composite together text and images into 1 image
4: #
1.23 ! albertel 5: # $Id: randomlylabel.pm,v 1.22 2005/02/23 15:48:54 albertel Exp $
1.1 albertel 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.22 albertel 29:
30: =pod
31:
32: =head1 Syntax of randomlylabel commands
33:
34: =over 4
35:
36: =item BGIMG
37:
38: /home/... file or href (href must contain http://...)
39: Expected to be HTTP escaped
40:
41: =item OBJCOUNT
42:
43: a number
44:
45: =item OBJTYPE
46:
47: a colon seperated list of types, supported types are
48:
49: B<LINE> B<RECTANGLE> B<POLYGON> B<ARC> B<FILL> B<IMAGE> B<LABEL>
50:
51: =item OBJI<num>
52:
53: arguments for this OBJ
54:
55: some common arguments are
56:
57: =over 4
58:
59: =item x y thickness
60:
61: are pixel values
62:
63: =item color
64:
65: a hexstring, without with out a leading # or x)
66:
67: =item filled
68:
69: boolean, (1 or 0)
70:
71: =back
72:
73: The argumants for the possible object types are
74:
75: =over 4
76:
77: =item LINE
78:
79: x1:y1:x2:y2:color:thickness
80:
81: =item RECTANGLE
82:
83: x1:y1:x2:y2:color:thickness:filled
84:
85: =item ARC
86:
87: x:y:width:height:start:end:color:thickness:filled
88:
89: =over 4
90:
91: =item start, end
92:
93: start and ends of the arc (in degrees)
94:
95: =back
96:
97: =item FILL
98:
99: x:y:color
100:
101: =item IMAGE
102:
103: x:y:file:transparent:srcX:srcY:destW:destH:srcW:srcH
104:
105: =over 4
106:
107: =item srcX,srcY,srcW,srcH
108:
109: the start and extant of the region in file to copy to x,y with width/height
110: destW destH
111:
112: =back
113:
114: =item LABEL
115:
116: x:y:text:font:color:direction
117:
118: =over 4
119:
120: =item text
121:
122: HTTP escaped string of the text to place on the image
123:
124: =item font
125:
126: one of B<tiny>, B<small>, B<medium>, B<large>, B<giant>, or an
127: installed TTF font and point size
128:
129: =item direction
130:
131: either B<horizontal> or B<vertical>
132:
133: =back
134:
135: =item POLYGON
136:
137: color:width:open:filled
138:
139: =over 4
140:
141: =item open
142:
143: boolean, (1 or 0)
144:
145: =back
146:
147: =back
148:
149:
150: =item OBJEXTRAI<num>
151:
152: extra arguments for object I<num>
153:
154: The possible values for this for the different object types are
155:
156: =over 4
157:
158: =item POLYGON
159:
160: a list of coords in the form
161:
162: (x,y)-(x,y)-(x,y)
163:
164: (there can be arbitrarily many of these)
165:
166: =back
167:
168: =back
169:
170: =head1 Example
171:
172: BGIMG=file
173: OBJTYPE=LINE:LINE:LINE:LINE
174: OBJCOUNT=4
175: OBJ0=xmin:ymin:xmax:ymax:FFFFFF:3
176: OBJ1=xmin:ymax:xmax:ymin:FFFFFF:3
177: OBJ2=xmin:ymin:xmax:ymax:FF0000:1
178: OBJ3=xmin:ymax:xmax:ymin:FF0000:1
179:
180: =cut
1.1 albertel 181:
182: package Apache::randomlylabel;
183:
184: use strict;
185: use Image::Magick;
186: use Apache::Constants qw(:common);
187: use Apache::loncommon();
1.17 albertel 188: use GD;
1.13 albertel 189: use GD::Polyline();
1.15 albertel 190: use LWP::UserAgent();
1.3 albertel 191:
192: sub get_image {
193: my ($imgsrc,$set_trans)=@_;
194: my $image;
1.15 albertel 195: if ($imgsrc !~ m|^(/home/)|) {
196: if ($imgsrc !~ /^http:/) {
197: $imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
198: }
199: my $ua=new LWP::UserAgent;
200: my $request=new HTTP::Request('GET',"$imgsrc");
201: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
202: my $file="/tmp/imagetmp".$$;
203: my $response=$ua->request($request,$file);
204: if ($response->is_success) {
205: if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
206: my $conv_image = Image::Magick->new;
207: my $current_figure = $conv_image->Read('filename'=>$file);
1.20 albertel 208: $conv_image->Set('type'=>'TrueColor');
1.15 albertel 209: $conv_image->Set('magick'=>'png');
210: my @blobs=$conv_image->ImageToBlob();
211: undef $conv_image;
212: $image = GD::Image->new($blobs[0]);
213: } else {
214: GD::Image->trueColor(1);
215: $image = GD::Image->new($file);
216: }
217: }
218: } elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
1.3 albertel 219: my $conv_image = Image::Magick->new;
220: my $current_figure = $conv_image->Read('filename'=>$imgsrc);
1.20 albertel 221: $conv_image->Set('type'=>'TrueColor');
1.3 albertel 222: $conv_image->Set('magick'=>'png');
223: my @blobs=$conv_image->ImageToBlob();
224: undef $conv_image;
225: $image = GD::Image->new($blobs[0]);
226: } else {
1.17 albertel 227: $image = GD::Image->trueColor(1);
1.3 albertel 228: $image = GD::Image->new($imgsrc);
229: }
1.9 albertel 230: if ($set_trans && defined($image)) {
1.3 albertel 231: my $white=$image->colorExact(255,255,255);
232: if ($white != -1) { $image->transparent($white); }
233: }
234: return $image;
235: }
1.1 albertel 236:
1.16 albertel 237: sub get_color_from_hexstring {
238: my ($image,$color)=@_;
239: if (!$color) { $color='000000'; }
1.23 ! albertel 240: $color=~s/^[x\#]//;
1.16 albertel 241: my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
242: $red=hex($red);$green=hex($green);$blue=hex($blue);
243: my $imcolor;
244: if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
245: $imcolor = $image->colorClosestHWB($red,$green,$blue);
246: }
247: return $imcolor;
248: }
249:
1.1 albertel 250: sub handler {
251: my $r = shift;
252: $r->content_type('image/png');
1.15 albertel 253: $r->send_http_header;
1.11 albertel 254: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
1.17 albertel 255: my $image;
256: if (defined($ENV{"cgi.$id.BGIMG"})) {
257: my $bgimg=&Apache::lonnet::unescape($ENV{"cgi.$id.BGIMG"});
1.18 albertel 258: #&Apache::lonnet::logthis("BGIMG is ".$bgimg);
1.17 albertel 259: $image=&get_image($bgimg,0);
260: if (! defined($image)) {
261: &Apache::lonnet::logthis('Unable to create image object for -'.
262: $id.'-'.$bgimg);
263: return OK;
264: }
1.16 albertel 265: } elsif (defined($ENV{"cgi.$id.SIZE"})) {
266: my ($width,$height)=split(':',$ENV{"cgi.$id.SIZE"});
267: $image = new GD::Image($width,$height,1);
268: my ($bgcolor)=split(':',$ENV{"cgi.$id.BGCOLOR"});
269: if ($bgcolor ne 'transparent') {
270: $bgcolor=&get_color_from_hexstring($image,$bgcolor);
271: # $image->rectangle(0,0,$width,$height,$bgcolor);
272: $image->fill(0,0,$bgcolor);
273: } else {
274: $bgcolor=&get_color_from_hexstring($image,'FFFFFF');
275: $image->fill(0,0,$bgcolor);
276: $image->transparent($bgcolor);
277: }
278: } else {
279: &Apache::lonnet::logthis('Unable to create image object, no info');
280: return OK;
1.4 matthew 281: }
1.1 albertel 282: #binmode(STDOUT);
1.16 albertel 283: my @objtypes=split(':',$ENV{"cgi.$id.OBJTYPE"});
284: foreach(my $i=0;$i<$ENV{"cgi.$id.OBJCOUNT"};$i++) {
285: my $type=shift(@objtypes);
286: if ($type eq 'LINE') {
287: my ($x1,$y1,$x2,$y2,$color,$thickness)=
288: split(':',$ENV{"cgi.$id.OBJ$i"});
289: my $imcolor=&get_color_from_hexstring($image,$color);
290: if (!defined($thickness)) { $thickness=1; }
291: $image->setThickness($thickness);
1.21 albertel 292: # $image->setAntiAliased($imcolor);
293: $image->line($x1,$y1,$x2,$y2,$imcolor);
1.16 albertel 294: } elsif ($type eq 'RECTANGLE') {
295: my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
296: split(':',$ENV{"cgi.$id.OBJ$i"});
297: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
298: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
299: my $imcolor=&get_color_from_hexstring($image,$color);
300: if (!defined($thickness)) { $thickness=1; }
301: $image->setThickness($thickness);
302: # $image->setAntiAliased($imcolor);
303: if ($filled) {
304: $image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
305: } else {
306: $image->rectangle($x1,$y1,$x2,$y2,$imcolor);
307: }
308: } elsif ($type eq 'POLYGON') {
1.21 albertel 309: my ($color,$width,$open,$filled)=split(':',$ENV{"cgi.$id.OBJ$i"});
1.16 albertel 310: my $imcolor=&get_color_from_hexstring($image,$color);
1.21 albertel 311: my $polygon = (($open && lc ($open ne 'no')) ?
312: (new GD::Polyline) : (new GD::Polygon));
1.18 albertel 313: my $added=0;
1.16 albertel 314: foreach my $coord (split('-',$ENV{"cgi.$id.OBJEXTRA$i"})) {
315: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
316: $polygon->addPt($x,$y);
1.18 albertel 317: $added++;
1.16 albertel 318: }
1.18 albertel 319:
1.16 albertel 320: $image->setThickness($width);
1.18 albertel 321: if ($added) {
1.21 albertel 322: if ($open && lc($open) ne 'no') {
1.18 albertel 323: $image->polydraw($polygon,$imcolor);
1.21 albertel 324: } elsif ($filled && lc($filled) ne 'no') {
325: $image->filledPolygon($polygon,$imcolor);
1.18 albertel 326: } else {
327: $image->polygon($polygon,$imcolor);
328: }
1.16 albertel 329: }
330: } elsif ($type eq 'ARC') {
331: my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
332: split(':',$ENV{"cgi.$id.OBJ$i"});
333: if (!$color) { $color='000000'; }
334: my $imcolor=&get_color_from_hexstring($image,$color);
335: if (!defined($thickness)) { $thickness=1; }
336: $image->setThickness($thickness);
337: # $image->setAntiAliased($imcolor);
338: if ($filled) {
339: $image->filledArc($x,$y,$width,$height,$start,$end,
340: $imcolor);
341: } else {
342: $image->arc($x,$y,$width,$height,$start,$end,$imcolor);
343: }
344: } elsif ($type eq 'FILL') {
345: my ($x,$y,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
346: if (!$color) { $color='000000'; }
347: my $imcolor=&get_color_from_hexstring($image,$color);
348: $image->fill($x,$y,$imcolor);
349: } elsif ($type eq 'IMAGE') {
1.21 albertel 350: my ($x,$y,$file,$transparent,$srcX,$srcY,$destW,$destH,$srcW,
351: $srcH)=split(':',$ENV{"cgi.$id.OBJ$i"});
1.16 albertel 352: $file=&Apache::lonnet::unescape($file);
353: if (!defined($transparent)) { $transparent=1; }
354: my $subimage=&get_image($file,$transparent);
355: if (!defined($subimage)) {
356: &Apache::lonnet::logthis('Unable to create image object for '.
357: $file);
358: next;
359: }
1.21 albertel 360: if (!defined($srcW) or !$srcW) {$srcW=($subimage->getBounds())[0];}
361: if (!defined($srcH) or !$srcH) {$srcH=($subimage->getBounds())[1];}
362: if (!defined($destW) or !$destW) { $destW=$srcW; }
363: if (!defined($destH) or !$destH) { $destH=$srcH; }
364: $image->copyResized($subimage,$x,$y,$srcX,$srcY,$destW,$destH,
365: $srcW,$srcH);
1.16 albertel 366: } elsif ($type eq 'LABEL') {
1.19 albertel 367: my ($x,$y,$text,$font,$color,$direction)=
368: split(':',$ENV{"cgi.$id.OBJ$i"});
1.16 albertel 369: $text=&Apache::lonnet::unescape($text);
370: my $imcolor=&get_color_from_hexstring($image,$color);
1.19 albertel 371: my $type='normal';
372: my ($height,$fontref);
373: if ($font eq 'tiny') {
374: $height=GD::Font->Tiny->height;
375: $fontref=GD::gdTinyFont;
376: } elsif ($font eq 'small') {
377: $height=GD::Font->Small->height;
378: $fontref=GD::gdSmallFont;
379: } elsif ($font eq 'medium') {
380: $height=GD::Font->MediumBold->height;
381: $fontref=GD::gdMediumBoldFont;
382: } elsif ($font eq 'large') {
383: $height=GD::Font->Large->height;
384: $fontref=GD::gdLargeFont;
1.21 albertel 385: } elsif ($font eq 'giant' || !$font) {
1.19 albertel 386: $height=GD::Font->Giant->height;
387: $fontref=GD::gdGiantFont;
388: } else {
389: $type='ttf';
390: }
391: if ($type eq 'normal' && $direction eq 'vertical') {
392: $image->stringUp($fontref,$x,$y-$height,$text,$imcolor);
393: } elsif ($type eq 'normal') {
394: $image->string($fontref,$x,$y-$height,$text,$imcolor);
395: } elsif ($type eq 'ttf') {
396: my ($fontname,$ptsize)=split(/\s+/,$font);
397: $image->stringFT($imcolor,$fontname,$ptsize,90,$x,$y,$text);
398: }
1.18 albertel 399: } else {
400: &Apache::lonnet::logthis("randomlylabel unable to handle object of type $type");
1.13 albertel 401: }
1.10 albertel 402: }
403: $image->setThickness(1);
1.3 albertel 404: $r->print($image->png);
1.1 albertel 405: return OK;
406: }
407:
408: 1;
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