1: #!/usr/bin/perl
2: # The LearningOnline Network with CAPA
3: # randomlabel.png: composite together text and images into 1 image
4: #
5: # $Id: randomlylabel.pm,v 1.18 2004/02/23 23:54:14 albertel Exp $
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: #
29: ###
30:
31: package Apache::randomlylabel;
32:
33: use strict;
34: use Image::Magick;
35: use Apache::Constants qw(:common);
36: use Apache::loncommon();
37: use GD;
38: use GD::Polyline();
39: use LWP::UserAgent();
40:
41: sub get_image {
42: my ($imgsrc,$set_trans)=@_;
43: my $image;
44: if ($imgsrc !~ m|^(/home/)|) {
45: if ($imgsrc !~ /^http:/) {
46: $imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
47: }
48: my $ua=new LWP::UserAgent;
49: my $request=new HTTP::Request('GET',"$imgsrc");
50: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
51: my $file="/tmp/imagetmp".$$;
52: my $response=$ua->request($request,$file);
53: if ($response->is_success) {
54: if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
55: my $conv_image = Image::Magick->new;
56: my $current_figure = $conv_image->Read('filename'=>$file);
57: $conv_image->Set('magick'=>'png');
58: my @blobs=$conv_image->ImageToBlob();
59: undef $conv_image;
60: $image = GD::Image->new($blobs[0]);
61: } else {
62: GD::Image->trueColor(1);
63: $image = GD::Image->new($file);
64: }
65: }
66: } elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
67: my $conv_image = Image::Magick->new;
68: my $current_figure = $conv_image->Read('filename'=>$imgsrc);
69: $conv_image->Set('magick'=>'png');
70: my @blobs=$conv_image->ImageToBlob();
71: undef $conv_image;
72: $image = GD::Image->new($blobs[0]);
73: } else {
74: $image = GD::Image->trueColor(1);
75: $image = GD::Image->new($imgsrc);
76: }
77: if ($set_trans && defined($image)) {
78: my $white=$image->colorExact(255,255,255);
79: if ($white != -1) { $image->transparent($white); }
80: }
81: return $image;
82: }
83:
84: sub get_color_from_hexstring {
85: my ($image,$color)=@_;
86: if (!$color) { $color='000000'; }
87: my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
88: $red=hex($red);$green=hex($green);$blue=hex($blue);
89: my $imcolor;
90: if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
91: $imcolor = $image->colorClosestHWB($red,$green,$blue);
92: }
93: return $imcolor;
94: }
95:
96: sub handler {
97: my $r = shift;
98: $r->content_type('image/png');
99: $r->send_http_header;
100: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
101: my $image;
102: if (defined($ENV{"cgi.$id.BGIMG"})) {
103: my $bgimg=&Apache::lonnet::unescape($ENV{"cgi.$id.BGIMG"});
104: #&Apache::lonnet::logthis("BGIMG is ".$bgimg);
105: $image=&get_image($bgimg,0);
106: if (! defined($image)) {
107: &Apache::lonnet::logthis('Unable to create image object for -'.
108: $id.'-'.$bgimg);
109: return OK;
110: }
111: } elsif (defined($ENV{"cgi.$id.SIZE"})) {
112: my ($width,$height)=split(':',$ENV{"cgi.$id.SIZE"});
113: $image = new GD::Image($width,$height,1);
114: my ($bgcolor)=split(':',$ENV{"cgi.$id.BGCOLOR"});
115: if ($bgcolor ne 'transparent') {
116: $bgcolor=&get_color_from_hexstring($image,$bgcolor);
117: # $image->rectangle(0,0,$width,$height,$bgcolor);
118: $image->fill(0,0,$bgcolor);
119: } else {
120: $bgcolor=&get_color_from_hexstring($image,'FFFFFF');
121: $image->fill(0,0,$bgcolor);
122: $image->transparent($bgcolor);
123: }
124: } else {
125: &Apache::lonnet::logthis('Unable to create image object, no info');
126: return OK;
127: }
128: #binmode(STDOUT);
129: my @objtypes=split(':',$ENV{"cgi.$id.OBJTYPE"});
130: foreach(my $i=0;$i<$ENV{"cgi.$id.OBJCOUNT"};$i++) {
131: my $type=shift(@objtypes);
132: if ($type eq 'LINE') {
133: my ($x1,$y1,$x2,$y2,$color,$thickness)=
134: split(':',$ENV{"cgi.$id.OBJ$i"});
135: my $imcolor=&get_color_from_hexstring($image,$color);
136: if (!defined($thickness)) { $thickness=1; }
137: $image->setThickness($thickness);
138: $image->setAntiAliased($imcolor);
139: $image->line($x1,$y1,$x2,$y2,gdAntiAliased);
140: } elsif ($type eq 'RECTANGLE') {
141: my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
142: split(':',$ENV{"cgi.$id.OBJ$i"});
143: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
144: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
145: my $imcolor=&get_color_from_hexstring($image,$color);
146: if (!defined($thickness)) { $thickness=1; }
147: $image->setThickness($thickness);
148: # $image->setAntiAliased($imcolor);
149: if ($filled) {
150: $image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
151: } else {
152: $image->rectangle($x1,$y1,$x2,$y2,$imcolor);
153: }
154: } elsif ($type eq 'POLYGON') {
155: my ($color,$width,$open)=split(':',$ENV{"cgi.$id.OBJ$i"});
156: my $imcolor=&get_color_from_hexstring($image,$color);
157: my $polygon = (($open) ? (new GD::Polyline) : (new GD::Polygon));
158: my $added=0;
159: foreach my $coord (split('-',$ENV{"cgi.$id.OBJEXTRA$i"})) {
160: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
161: $polygon->addPt($x,$y);
162: $added++;
163: }
164:
165: $image->setThickness($width);
166: if ($added) {
167: if ($open) {
168: $image->polydraw($polygon,$imcolor);
169: } else {
170: $image->polygon($polygon,$imcolor);
171: }
172: }
173: } elsif ($type eq 'ARC') {
174: my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
175: split(':',$ENV{"cgi.$id.OBJ$i"});
176: if (!$color) { $color='000000'; }
177: my $imcolor=&get_color_from_hexstring($image,$color);
178: if (!defined($thickness)) { $thickness=1; }
179: $image->setThickness($thickness);
180: # $image->setAntiAliased($imcolor);
181: if ($filled) {
182: $image->filledArc($x,$y,$width,$height,$start,$end,
183: $imcolor);
184: } else {
185: $image->arc($x,$y,$width,$height,$start,$end,$imcolor);
186: }
187: } elsif ($type eq 'FILL') {
188: my ($x,$y,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
189: if (!$color) { $color='000000'; }
190: my $imcolor=&get_color_from_hexstring($image,$color);
191: $image->fill($x,$y,$imcolor);
192: } elsif ($type eq 'IMAGE') {
193: my ($x,$y,$file,$transparent)=split(':',$ENV{"cgi.$id.OBJ$i"});
194: $file=&Apache::lonnet::unescape($file);
195: if (!defined($transparent)) { $transparent=1; }
196: my $subimage=&get_image($file,$transparent);
197: if (!defined($subimage)) {
198: &Apache::lonnet::logthis('Unable to create image object for '.
199: $file);
200: next;
201: }
202: $image->copy($subimage,$x,$y,0,0,$subimage->getBounds());
203: } elsif ($type eq 'LABEL') {
204: my ($x,$y,$text,$font,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
205: $text=&Apache::lonnet::unescape($text);
206: my $imcolor=&get_color_from_hexstring($image,$color);
207: my $height=GD::Font->Giant->height;
208: $image->string(GD::gdGiantFont,$x,$y-$height,$text,$imcolor);
209: } else {
210: &Apache::lonnet::logthis("randomlylabel unable to handle object of type $type");
211: }
212: }
213: $image->setThickness(1);
214: $r->print($image->png);
215: return OK;
216: }
217:
218: 1;
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