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 1.17 2004/02/23 23:24:50 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: &Apache::lonnet::logthis("imagesrc1 is $imgsrc");
45: if ($imgsrc !~ m|^(/home/)|) {
46: &Apache::lonnet::logthis("imagesrc2 is $imgsrc");
47: if ($imgsrc !~ /^http:/) {
48: $imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
49: }
50: &Apache::lonnet::logthis("imagesrc3 is $imgsrc");
51: &Apache::lonnet::logthis("LWP fetching image $imgsrc");
52: my $ua=new LWP::UserAgent;
53: my $request=new HTTP::Request('GET',"$imgsrc");
54: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
55: my $file="/tmp/imagetmp".$$;
56: my $response=$ua->request($request,$file);
57: &Apache::lonnet::logthis("content is ".$response->content_type);
58: &Apache::lonnet::logthis($response->is_success);
59: &Apache::lonnet::logthis($response->status_line);
60: if ($response->is_success) {
61: if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
62: my $conv_image = Image::Magick->new;
63: my $current_figure = $conv_image->Read('filename'=>$file);
64: $conv_image->Set('magick'=>'png');
65: my @blobs=$conv_image->ImageToBlob();
66: undef $conv_image;
67: $image = GD::Image->new($blobs[0]);
68: } else {
69: GD::Image->trueColor(1);
70: $image = GD::Image->new($file);
71: }
72: }
73: } elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
74: my $conv_image = Image::Magick->new;
75: my $current_figure = $conv_image->Read('filename'=>$imgsrc);
76: &Apache::lonnet::logthis("Read said $current_figure");
77: $conv_image->Set('magick'=>'png');
78: my @blobs=$conv_image->ImageToBlob();
79: undef $conv_image;
80: $image = GD::Image->new($blobs[0]);
81: } else {
82: $image = GD::Image->trueColor(1);
83: $image = GD::Image->new($imgsrc);
84: if (!defined($image)) {
85: &Apache::lonnet::logthis("Read said bluh");
86: } else {
87: &Apache::lonnet::logthis("looks good");
88: }
89: }
90: if ($set_trans && defined($image)) {
91: my $white=$image->colorExact(255,255,255);
92: if ($white != -1) { $image->transparent($white); }
93: }
94: return $image;
95: }
96:
97: sub get_color_from_hexstring {
98: my ($image,$color)=@_;
99: if (!$color) { $color='000000'; }
100: my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
101: $red=hex($red);$green=hex($green);$blue=hex($blue);
102: my $imcolor;
103: if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
104: $imcolor = $image->colorClosestHWB($red,$green,$blue);
105: }
106: return $imcolor;
107: }
108:
109: sub handler {
110: my $r = shift;
111: $r->content_type('image/png');
112: $r->send_http_header;
113: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
114: my $image;
115: if (defined($ENV{"cgi.$id.BGIMG"})) {
116: my $bgimg=&Apache::lonnet::unescape($ENV{"cgi.$id.BGIMG"});
117: &Apache::lonnet::logthis("BGIMG is ".$bgimg);
118: $image=&get_image($bgimg,0);
119: if (! defined($image)) {
120: &Apache::lonnet::logthis('Unable to create image object for -'.
121: $id.'-'.$bgimg);
122: return OK;
123: }
124: } elsif (defined($ENV{"cgi.$id.SIZE"})) {
125: my ($width,$height)=split(':',$ENV{"cgi.$id.SIZE"});
126: $image = new GD::Image($width,$height,1);
127: my ($bgcolor)=split(':',$ENV{"cgi.$id.BGCOLOR"});
128: if ($bgcolor ne 'transparent') {
129: $bgcolor=&get_color_from_hexstring($image,$bgcolor);
130: # $image->rectangle(0,0,$width,$height,$bgcolor);
131: $image->fill(0,0,$bgcolor);
132: } else {
133: $bgcolor=&get_color_from_hexstring($image,'FFFFFF');
134: $image->fill(0,0,$bgcolor);
135: $image->transparent($bgcolor);
136: }
137: } else {
138: &Apache::lonnet::logthis('Unable to create image object, no info');
139: return OK;
140: }
141: #binmode(STDOUT);
142: my @objtypes=split(':',$ENV{"cgi.$id.OBJTYPE"});
143: foreach(my $i=0;$i<$ENV{"cgi.$id.OBJCOUNT"};$i++) {
144: my $type=shift(@objtypes);
145: &Apache::lonnet::logthis("type is $type");
146: if ($type eq 'LINE') {
147: my ($x1,$y1,$x2,$y2,$color,$thickness)=
148: split(':',$ENV{"cgi.$id.OBJ$i"});
149: my $imcolor=&get_color_from_hexstring($image,$color);
150: if (!defined($thickness)) { $thickness=1; }
151: $image->setThickness($thickness);
152: $image->setAntiAliased($imcolor);
153: $image->line($x1,$y1,$x2,$y2,gdAntiAliased);
154: } elsif ($type eq 'RECTANGLE') {
155: my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
156: split(':',$ENV{"cgi.$id.OBJ$i"});
157: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
158: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
159: my $imcolor=&get_color_from_hexstring($image,$color);
160: if (!defined($thickness)) { $thickness=1; }
161: $image->setThickness($thickness);
162: # $image->setAntiAliased($imcolor);
163: if ($filled) {
164: $image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
165: } else {
166: $image->rectangle($x1,$y1,$x2,$y2,$imcolor);
167: }
168: } elsif ($type eq 'POLYGON') {
169: my ($color,$width,$open)=split(':',$ENV{"cgi.$id.OBJ$i"});
170: my $imcolor=&get_color_from_hexstring($image,$color);
171: my $polygon = (($open) ? (new GD::Polyline) : (new GD::Polygon));
172: foreach my $coord (split('-',$ENV{"cgi.$id.OBJEXTRA$i"})) {
173: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
174: $polygon->addPt($x,$y);
175: }
176: $image->setThickness($width);
177: if ($open) {
178: $image->polydraw($polygon,$imcolor);
179: } else {
180: $image->polygon($polygon,$imcolor);
181: }
182: } elsif ($type eq 'ARC') {
183: my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
184: split(':',$ENV{"cgi.$id.OBJ$i"});
185: if (!$color) { $color='000000'; }
186: my $imcolor=&get_color_from_hexstring($image,$color);
187: if (!defined($thickness)) { $thickness=1; }
188: $image->setThickness($thickness);
189: # $image->setAntiAliased($imcolor);
190: if ($filled) {
191: $image->filledArc($x,$y,$width,$height,$start,$end,
192: $imcolor);
193: } else {
194: $image->arc($x,$y,$width,$height,$start,$end,$imcolor);
195: }
196: } elsif ($type eq 'FILL') {
197: my ($x,$y,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
198: if (!$color) { $color='000000'; }
199: my $imcolor=&get_color_from_hexstring($image,$color);
200: $image->fill($x,$y,$imcolor);
201: } elsif ($type eq 'IMAGE') {
202: my ($x,$y,$file,$transparent)=split(':',$ENV{"cgi.$id.OBJ$i"});
203: $file=&Apache::lonnet::unescape($file);
204: if (!defined($transparent)) { $transparent=1; }
205: my $subimage=&get_image($file,$transparent);
206: if (!defined($subimage)) {
207: &Apache::lonnet::logthis('Unable to create image object for '.
208: $file);
209: next;
210: }
211: $image->copy($subimage,$x,$y,0,0,$subimage->getBounds());
212: } elsif ($type eq 'LABEL') {
213: my ($x,$y,$text,$font,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
214: $text=&Apache::lonnet::unescape($text);
215: my $imcolor=&get_color_from_hexstring($image,$color);
216: my $height=GD::Font->Giant->height;
217: $image->string(GD::gdGiantFont,$x,$y-$height,$text,$imcolor);
218: }
219: }
220: $image->setThickness(1);
221: $r->print($image->png);
222: return OK;
223: }
224:
225: 1;
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