1: # The LearningOnline Network with CAPA
2: # randomlabel.png: composite together text and images into 1 image
3: #
4: # $Id: randomlylabel.pm,v 1.27 2005/11/15 20:46:27 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:
29: =pod
30:
31: =head1 Syntax of randomlylabel commands
32:
33: Required items are: (one of BGIMG or SIZE) and OBJCOUNT
34:
35: =over 4
36:
37: =item BGIMG
38:
39: /home/... file
40: /res/ ... URL
41: or href (href must contain http://...)
42: Expected to be HTTP escaped
43:
44: =item SIZE
45:
46: width:height
47:
48: Creates a blank canvas of size width,height.
49:
50: =item BGCOLOR
51:
52: either I<transparent> or a color hexstring
53:
54: Sets the background color, if SIZE is used to create a new canvas,
55: I<trasparent> makes the background transparent.
56:
57: =item OBJCOUNT
58:
59: a number
60:
61: =item OBJTYPE
62:
63: a colon seperated list of types, supported types are
64:
65: B<LINE> B<RECTANGLE> B<POLYGON> B<ARC> B<FILL> B<IMAGE> B<LABEL>
66:
67: =item OBJI<num>
68:
69: arguments for this OBJ
70:
71: some common arguments are
72:
73: =over 4
74:
75: =item x y thickness
76:
77: are pixel values
78:
79: =item color
80:
81: a hexstring, without with out a leading # or x)
82:
83: =item filled
84:
85: boolean, (1 or 0)
86:
87: =back
88:
89: The argumants for the possible object types are
90:
91: =over 4
92:
93: =item LINE
94:
95: x1:y1:x2:y2:color:thickness
96:
97: =item RECTANGLE
98:
99: x1:y1:x2:y2:color:thickness:filled
100:
101: =item ARC
102:
103: x:y:width:height:start:end:color:thickness:filled
104:
105: =over 4
106:
107: =item start, end
108:
109: start and ends of the arc (in degrees)
110:
111: =back
112:
113: =item FILL
114:
115: x:y:color
116:
117: =item IMAGE
118:
119: x:y:file:transparent:srcX:srcY:destW:destH:srcW:srcH
120:
121: =over 4
122:
123: =item srcX,srcY,srcW,srcH
124:
125: the start and extant of the region in file to copy to x,y with width/height
126: destW destH
127:
128: =back
129:
130: =item LABEL
131:
132: x:y:text:font:color:direction
133:
134: =over 4
135:
136: =item text
137:
138: HTTP escaped string of the text to place on the image
139:
140: =item font
141:
142: one of B<tiny>, B<small>, B<medium>, B<large>, B<giant>, or an
143: installed TTF font and point size
144:
145: =item direction
146:
147: either B<horizontal> or B<vertical>
148:
149: =back
150:
151: =item POLYGON
152:
153: color:width:open:filled
154:
155: =over 4
156:
157: =item open
158:
159: boolean, (1 or 0)
160:
161: =back
162:
163: =back
164:
165:
166: =item OBJEXTRAI<num>
167:
168: extra arguments for object I<num>
169:
170: The possible values for this for the different object types are
171:
172: =over 4
173:
174: =item POLYGON
175:
176: a list of coords in the form
177:
178: (x,y)-(x,y)-(x,y)
179:
180: (there can be arbitrarily many of these)
181:
182: =back
183:
184: =back
185:
186: =head1 Example
187:
188: BGIMG=file
189: OBJTYPE=LINE:LINE:LINE:LINE
190: OBJCOUNT=4
191: OBJ0=xmin:ymin:xmax:ymax:FFFFFF:3
192: OBJ1=xmin:ymax:xmax:ymin:FFFFFF:3
193: OBJ2=xmin:ymin:xmax:ymax:FF0000:1
194: OBJ3=xmin:ymax:xmax:ymin:FF0000:1
195:
196: =cut
197:
198: package Apache::randomlylabel;
199:
200: use strict;
201: use Image::Magick;
202: use Apache::Constants qw(:common);
203: use Apache::loncommon();
204: use GD;
205: use GD::Polyline();
206: use LWP::UserAgent();
207: use Apache::lonnet;
208:
209: sub get_image {
210: my ($imgsrc,$set_trans)=@_;
211: my $image;
212: if ($imgsrc !~ m|^(/home/)|) {
213: if ($imgsrc !~ /^http:/) {
214: $imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
215: }
216: my $ua=new LWP::UserAgent;
217: my $request=new HTTP::Request('GET',"$imgsrc");
218: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
219: my $file="/tmp/imagetmp".$$;
220: my $response=$ua->request($request,$file);
221: if ($response->is_success) {
222: if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
223: my $conv_image = Image::Magick->new;
224: my $current_figure = $conv_image->Read('filename'=>$file);
225: $conv_image->Set('type'=>'TrueColor');
226: $conv_image->Set('magick'=>'png');
227: my @blobs=$conv_image->ImageToBlob();
228: undef $conv_image;
229: $image = GD::Image->new($blobs[0]);
230: } else {
231: GD::Image->trueColor(1);
232: $image = GD::Image->new($file);
233: }
234: }
235: } elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
236: my $conv_image = Image::Magick->new;
237: my $current_figure = $conv_image->Read('filename'=>$imgsrc);
238: $conv_image->Set('type'=>'TrueColor');
239: $conv_image->Set('magick'=>'png');
240: my @blobs=$conv_image->ImageToBlob();
241: undef $conv_image;
242: $image = GD::Image->new($blobs[0]);
243: } else {
244: $image = GD::Image->trueColor(1);
245: $image = GD::Image->new($imgsrc);
246: }
247: if ($set_trans && defined($image)) {
248: my $white=$image->colorExact(255,255,255);
249: if ($white != -1) { $image->transparent($white); }
250: }
251: return $image;
252: }
253:
254: sub get_color_from_hexstring {
255: my ($image,$color)=@_;
256: if (!$color) { $color='000000'; }
257: $color=~s/^[x\#]//;
258: my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
259: $red=hex($red);$green=hex($green);$blue=hex($blue);
260: my $imcolor;
261: if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
262: $imcolor = $image->colorClosestHWB($red,$green,$blue);
263: }
264: return $imcolor;
265: }
266:
267: sub handler {
268: my $r = shift;
269: $r->content_type('image/png');
270: $r->send_http_header;
271: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
272: my $image;
273: my $prefix="cgi.$id.";
274: if ($ENV{'QUERY_STRING'}=~/OBJCOUNT\=/) {
275: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
276: $prefix='form.';
277: }
278: if (defined($env{$prefix."BGIMG"})) {
279: my $bgimg=&Apache::lonnet::unescape($env{$prefix."BGIMG"});
280: #&Apache::lonnet::logthis("BGIMG is ".$bgimg);
281: $image=&get_image($bgimg,0);
282: if (! defined($image)) {
283: &Apache::lonnet::logthis('Unable to create image object for -'.
284: $id.'-'.$bgimg);
285: return OK;
286: }
287: } elsif (defined($env{$prefix."SIZE"})) {
288: my ($width,$height)=split(':',$env{$prefix."SIZE"});
289: $image = new GD::Image($width,$height,1);
290: my ($bgcolor)=split(':',$env{$prefix."BGCOLOR"});
291: if ($bgcolor ne 'transparent') {
292: $bgcolor=&get_color_from_hexstring($image,$bgcolor);
293: # $image->rectangle(0,0,$width,$height,$bgcolor);
294: $image->fill(0,0,$bgcolor);
295: } else {
296: $bgcolor=&get_color_from_hexstring($image,'FFFFFF');
297: $image->fill(0,0,$bgcolor);
298: $image->transparent($bgcolor);
299: }
300: } else {
301: &Apache::lonnet::logthis('Unable to create image object, no info');
302: return OK;
303: }
304: #binmode(STDOUT);
305: my @objtypes=split(':',$env{$prefix."OBJTYPE"});
306: foreach(my $i=0;$i<$env{$prefix."OBJCOUNT"};$i++) {
307: my $type=shift(@objtypes);
308: if ($type eq 'LINE') {
309: my ($x1,$y1,$x2,$y2,$color,$thickness)=
310: split(':',$env{$prefix."OBJ$i"});
311: my $imcolor=&get_color_from_hexstring($image,$color);
312: if (!defined($thickness)) { $thickness=1; }
313: $image->setThickness($thickness);
314: # $image->setAntiAliased($imcolor);
315: $image->line($x1,$y1,$x2,$y2,$imcolor);
316: } elsif ($type eq 'RECTANGLE') {
317: my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
318: split(':',$env{$prefix."OBJ$i"});
319: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
320: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
321: my $imcolor=&get_color_from_hexstring($image,$color);
322: if (!defined($thickness)) { $thickness=1; }
323: $image->setThickness($thickness);
324: # $image->setAntiAliased($imcolor);
325: if ($filled) {
326: $image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
327: } else {
328: $image->rectangle($x1,$y1,$x2,$y2,$imcolor);
329: }
330: } elsif ($type eq 'POLYGON') {
331: my ($color,$width,$open,$filled)=split(':',$env{$prefix."OBJ$i"});
332: my $imcolor=&get_color_from_hexstring($image,$color);
333: my $polygon = (($open && lc ($open ne 'no')) ?
334: (new GD::Polyline) : (new GD::Polygon));
335: my $added=0;
336: foreach my $coord (split('-',$env{$prefix."OBJEXTRA$i"})) {
337: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
338: $polygon->addPt($x,$y);
339: $added++;
340: }
341:
342: $image->setThickness($width);
343: if ($added) {
344: if ($open && lc($open) ne 'no') {
345: $image->polydraw($polygon,$imcolor);
346: } elsif ($filled && lc($filled) ne 'no') {
347: $image->filledPolygon($polygon,$imcolor);
348: } else {
349: $image->polygon($polygon,$imcolor);
350: }
351: }
352: } elsif ($type eq 'ARC') {
353: my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
354: split(':',$env{$prefix."OBJ$i"});
355: if (!$color) { $color='000000'; }
356: my $imcolor=&get_color_from_hexstring($image,$color);
357: if (!defined($thickness)) { $thickness=1; }
358: $image->setThickness($thickness);
359: # $image->setAntiAliased($imcolor);
360: if ($filled) {
361: $image->filledArc($x,$y,$width,$height,$start,$end,
362: $imcolor);
363: } else {
364: $image->arc($x,$y,$width,$height,$start,$end,$imcolor);
365: }
366: } elsif ($type eq 'FILL') {
367: my ($x,$y,$color)=split(':',$env{$prefix."OBJ$i"});
368: if (!$color) { $color='000000'; }
369: my $imcolor=&get_color_from_hexstring($image,$color);
370: $image->fill($x,$y,$imcolor);
371: } elsif ($type eq 'IMAGE') {
372: my ($x,$y,$file,$transparent,$srcX,$srcY,$destW,$destH,$srcW,
373: $srcH)=split(':',$env{$prefix."OBJ$i"});
374: $file=&Apache::lonnet::unescape($file);
375: if (!defined($transparent)) { $transparent=1; }
376: my $subimage=&get_image($file,$transparent);
377: if (!defined($subimage)) {
378: &Apache::lonnet::logthis('Unable to create image object for '.
379: $file);
380: next;
381: }
382: if (!defined($srcW) or !$srcW) {$srcW=($subimage->getBounds())[0];}
383: if (!defined($srcH) or !$srcH) {$srcH=($subimage->getBounds())[1];}
384: if (!defined($destW) or !$destW) { $destW=$srcW; }
385: if (!defined($destH) or !$destH) { $destH=$srcH; }
386: $image->copyResized($subimage,$x,$y,$srcX,$srcY,$destW,$destH,
387: $srcW,$srcH);
388: } elsif ($type eq 'LABEL') {
389: my ($x,$y,$text,$font,$color,$direction)=
390: split(':',$env{$prefix."OBJ$i"});
391: $text=&Apache::lonnet::unescape($text);
392: my $imcolor=&get_color_from_hexstring($image,$color);
393: my $type='normal';
394: my ($height,$fontref);
395: if ($font eq 'tiny') {
396: $height=GD::Font->Tiny->height;
397: $fontref=GD::gdTinyFont;
398: } elsif ($font eq 'small') {
399: $height=GD::Font->Small->height;
400: $fontref=GD::gdSmallFont;
401: } elsif ($font eq 'medium') {
402: $height=GD::Font->MediumBold->height;
403: $fontref=GD::gdMediumBoldFont;
404: } elsif ($font eq 'large') {
405: $height=GD::Font->Large->height;
406: $fontref=GD::gdLargeFont;
407: } elsif ($font eq 'giant' || !$font) {
408: $height=GD::Font->Giant->height;
409: $fontref=GD::gdGiantFont;
410: } else {
411: $type='ttf';
412: }
413: if ($type eq 'normal' && $direction eq 'vertical') {
414: $image->stringUp($fontref,$x,$y-$height,$text,$imcolor);
415: } elsif ($type eq 'normal') {
416: $image->string($fontref,$x,$y-$height,$text,$imcolor);
417: } elsif ($type eq 'ttf') {
418: my ($fontname,$ptsize)=split(/\s+/,$font);
419: $image->stringFT($imcolor,$fontname,$ptsize,90,$x,$y,$text);
420: }
421: } else {
422: &Apache::lonnet::logthis("randomlylabel unable to handle object of type $type");
423: }
424: }
425: $image->setThickness(1);
426: $r->print($image->png);
427: return OK;
428: }
429:
430: 1;
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