Annotation of loncom/homework/randomlylabel.pm, revision 1.25
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: #
1.25 ! www 5: # $Id: randomlylabel.pm,v 1.24 2005/02/23 16:11:42 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:
1.25 ! www 34: Required items are: (one of BGIMG or SIZE) and OBJCOUNT
1.24 albertel 35:
1.22 albertel 36: =over 4
37:
38: =item BGIMG
39:
1.25 ! www 40: /home/... file
! 41: /res/ ... URL
! 42: or href (href must contain http://...)
1.22 albertel 43: Expected to be HTTP escaped
44:
1.24 albertel 45: =item SIZE
46:
47: width:height
48:
49: Creates a blank canvas of size width,height.
50:
51: =item BGCOLOR
52:
53: either I<transparent> or a color hexstring
54:
55: Sets the background color, if SIZE is used to create a new canvas,
56: I<trasparent> makes the background transparent.
57:
1.22 albertel 58: =item OBJCOUNT
59:
60: a number
61:
62: =item OBJTYPE
63:
64: a colon seperated list of types, supported types are
65:
66: B<LINE> B<RECTANGLE> B<POLYGON> B<ARC> B<FILL> B<IMAGE> B<LABEL>
67:
68: =item OBJI<num>
69:
70: arguments for this OBJ
71:
72: some common arguments are
73:
74: =over 4
75:
76: =item x y thickness
77:
78: are pixel values
79:
80: =item color
81:
82: a hexstring, without with out a leading # or x)
83:
84: =item filled
85:
86: boolean, (1 or 0)
87:
88: =back
89:
90: The argumants for the possible object types are
91:
92: =over 4
93:
94: =item LINE
95:
96: x1:y1:x2:y2:color:thickness
97:
98: =item RECTANGLE
99:
100: x1:y1:x2:y2:color:thickness:filled
101:
102: =item ARC
103:
104: x:y:width:height:start:end:color:thickness:filled
105:
106: =over 4
107:
108: =item start, end
109:
110: start and ends of the arc (in degrees)
111:
112: =back
113:
114: =item FILL
115:
116: x:y:color
117:
118: =item IMAGE
119:
120: x:y:file:transparent:srcX:srcY:destW:destH:srcW:srcH
121:
122: =over 4
123:
124: =item srcX,srcY,srcW,srcH
125:
126: the start and extant of the region in file to copy to x,y with width/height
127: destW destH
128:
129: =back
130:
131: =item LABEL
132:
133: x:y:text:font:color:direction
134:
135: =over 4
136:
137: =item text
138:
139: HTTP escaped string of the text to place on the image
140:
141: =item font
142:
143: one of B<tiny>, B<small>, B<medium>, B<large>, B<giant>, or an
144: installed TTF font and point size
145:
146: =item direction
147:
148: either B<horizontal> or B<vertical>
149:
150: =back
151:
152: =item POLYGON
153:
154: color:width:open:filled
155:
156: =over 4
157:
158: =item open
159:
160: boolean, (1 or 0)
161:
162: =back
163:
164: =back
165:
166:
167: =item OBJEXTRAI<num>
168:
169: extra arguments for object I<num>
170:
171: The possible values for this for the different object types are
172:
173: =over 4
174:
175: =item POLYGON
176:
177: a list of coords in the form
178:
179: (x,y)-(x,y)-(x,y)
180:
181: (there can be arbitrarily many of these)
182:
183: =back
184:
185: =back
186:
187: =head1 Example
188:
189: BGIMG=file
190: OBJTYPE=LINE:LINE:LINE:LINE
191: OBJCOUNT=4
192: OBJ0=xmin:ymin:xmax:ymax:FFFFFF:3
193: OBJ1=xmin:ymax:xmax:ymin:FFFFFF:3
194: OBJ2=xmin:ymin:xmax:ymax:FF0000:1
195: OBJ3=xmin:ymax:xmax:ymin:FF0000:1
196:
197: =cut
1.1 albertel 198:
199: package Apache::randomlylabel;
200:
201: use strict;
202: use Image::Magick;
203: use Apache::Constants qw(:common);
204: use Apache::loncommon();
1.17 albertel 205: use GD;
1.13 albertel 206: use GD::Polyline();
1.15 albertel 207: use LWP::UserAgent();
1.3 albertel 208:
209: sub get_image {
210: my ($imgsrc,$set_trans)=@_;
211: my $image;
1.15 albertel 212: if ($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);
1.20 albertel 225: $conv_image->Set('type'=>'TrueColor');
1.15 albertel 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) {
1.3 albertel 236: my $conv_image = Image::Magick->new;
237: my $current_figure = $conv_image->Read('filename'=>$imgsrc);
1.20 albertel 238: $conv_image->Set('type'=>'TrueColor');
1.3 albertel 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 {
1.17 albertel 244: $image = GD::Image->trueColor(1);
1.3 albertel 245: $image = GD::Image->new($imgsrc);
246: }
1.9 albertel 247: if ($set_trans && defined($image)) {
1.3 albertel 248: my $white=$image->colorExact(255,255,255);
249: if ($white != -1) { $image->transparent($white); }
250: }
251: return $image;
252: }
1.1 albertel 253:
1.16 albertel 254: sub get_color_from_hexstring {
255: my ($image,$color)=@_;
256: if (!$color) { $color='000000'; }
1.23 albertel 257: $color=~s/^[x\#]//;
1.16 albertel 258: my (undef,$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:
1.1 albertel 267: sub handler {
268: my $r = shift;
269: $r->content_type('image/png');
1.15 albertel 270: $r->send_http_header;
1.11 albertel 271: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
1.17 albertel 272: my $image;
1.24 albertel 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{$prefix."BGIMG"});
1.18 albertel 280: #&Apache::lonnet::logthis("BGIMG is ".$bgimg);
1.17 albertel 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: }
1.24 albertel 287: } elsif (defined($ENV{$prefix."SIZE"})) {
288: my ($width,$height)=split(':',$ENV{$prefix."SIZE"});
1.16 albertel 289: $image = new GD::Image($width,$height,1);
1.24 albertel 290: my ($bgcolor)=split(':',$ENV{$prefix."BGCOLOR"});
1.16 albertel 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;
1.4 matthew 303: }
1.1 albertel 304: #binmode(STDOUT);
1.24 albertel 305: my @objtypes=split(':',$ENV{$prefix."OBJTYPE"});
306: foreach(my $i=0;$i<$ENV{$prefix."OBJCOUNT"};$i++) {
1.16 albertel 307: my $type=shift(@objtypes);
308: if ($type eq 'LINE') {
309: my ($x1,$y1,$x2,$y2,$color,$thickness)=
1.24 albertel 310: split(':',$ENV{$prefix."OBJ$i"});
1.16 albertel 311: my $imcolor=&get_color_from_hexstring($image,$color);
312: if (!defined($thickness)) { $thickness=1; }
313: $image->setThickness($thickness);
1.21 albertel 314: # $image->setAntiAliased($imcolor);
315: $image->line($x1,$y1,$x2,$y2,$imcolor);
1.16 albertel 316: } elsif ($type eq 'RECTANGLE') {
317: my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
1.24 albertel 318: split(':',$ENV{$prefix."OBJ$i"});
1.16 albertel 319: if ($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 ($type eq 'POLYGON') {
1.24 albertel 331: my ($color,$width,$open,$filled)=split(':',$ENV{$prefix."OBJ$i"});
1.16 albertel 332: my $imcolor=&get_color_from_hexstring($image,$color);
1.21 albertel 333: my $polygon = (($open && lc ($open ne 'no')) ?
334: (new GD::Polyline) : (new GD::Polygon));
1.18 albertel 335: my $added=0;
1.24 albertel 336: foreach my $coord (split('-',$ENV{$prefix."OBJEXTRA$i"})) {
1.16 albertel 337: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
338: $polygon->addPt($x,$y);
1.18 albertel 339: $added++;
1.16 albertel 340: }
1.18 albertel 341:
1.16 albertel 342: $image->setThickness($width);
1.18 albertel 343: if ($added) {
1.21 albertel 344: if ($open && lc($open) ne 'no') {
1.18 albertel 345: $image->polydraw($polygon,$imcolor);
1.21 albertel 346: } elsif ($filled && lc($filled) ne 'no') {
347: $image->filledPolygon($polygon,$imcolor);
1.18 albertel 348: } else {
349: $image->polygon($polygon,$imcolor);
350: }
1.16 albertel 351: }
352: } elsif ($type eq 'ARC') {
353: my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
1.24 albertel 354: split(':',$ENV{$prefix."OBJ$i"});
1.16 albertel 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 ($type eq 'FILL') {
1.24 albertel 367: my ($x,$y,$color)=split(':',$ENV{$prefix."OBJ$i"});
1.16 albertel 368: if (!$color) { $color='000000'; }
369: my $imcolor=&get_color_from_hexstring($image,$color);
370: $image->fill($x,$y,$imcolor);
371: } elsif ($type eq 'IMAGE') {
1.21 albertel 372: my ($x,$y,$file,$transparent,$srcX,$srcY,$destW,$destH,$srcW,
1.24 albertel 373: $srcH)=split(':',$ENV{$prefix."OBJ$i"});
1.16 albertel 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: $file);
380: next;
381: }
1.21 albertel 382: if (!defined($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);
1.16 albertel 388: } elsif ($type eq 'LABEL') {
1.19 albertel 389: my ($x,$y,$text,$font,$color,$direction)=
1.24 albertel 390: split(':',$ENV{$prefix."OBJ$i"});
1.16 albertel 391: $text=&Apache::lonnet::unescape($text);
392: my $imcolor=&get_color_from_hexstring($image,$color);
1.19 albertel 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: $fontref=GD::gdLargeFont;
1.21 albertel 407: } elsif ($font eq 'giant' || !$font) {
1.19 albertel 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: }
1.18 albertel 421: } else {
422: &Apache::lonnet::logthis("randomlylabel unable to handle object of type $type");
1.13 albertel 423: }
1.10 albertel 424: }
425: $image->setThickness(1);
1.3 albertel 426: $r->print($image->png);
1.1 albertel 427: return OK;
428: }
429:
430: 1;
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