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 1.10 2003/11/10 23:29:27 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:
39: sub get_image {
40: my ($imgsrc,$set_trans)=@_;
41: my $image;
42: if ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
43: my $conv_image = Image::Magick->new;
44: my $current_figure = $conv_image->Read('filename'=>$imgsrc);
45: $conv_image->Set('magick'=>'png');
46: my @blobs=$conv_image->ImageToBlob();
47: undef $conv_image;
48: $image = GD::Image->new($blobs[0]);
49: } else {
50: GD::Image->trueColor(1);
51: $image = GD::Image->new($imgsrc);
52: }
53: if ($set_trans && defined($image)) {
54: my $white=$image->colorExact(255,255,255);
55: if ($white != -1) { $image->transparent($white); }
56: }
57: return $image;
58: }
59:
60: sub handler {
61: my $r = shift;
62: $r->content_type('image/png');
63: my (undef,$token) = split(/=/,$ENV{'QUERY_STRING'});
64: &Apache::loncommon::get_unprocessed_cgi(
65: &Apache::lonnet::unescape($ENV{'imagerequest.'.$token}));
66: my $image=&get_image($ENV{"form.BGIMG"},0);
67: if (! defined($image)) {
68: &Apache::lonnet::logthis('Unable to create image object for '.
69: $ENV{"form.BGIMG"});
70: return OK;
71: }
72: #binmode(STDOUT);
73: my $black;
74: if (!($black=$image->colorResolve(0,0,0))) {
75: $black = $image->colorClosestHWB(0,0,0);
76: }
77: for(my $i=0;$i<$ENV{"form.ICOUNT"};$i++) {
78: my $subimage=&get_image($ENV{"form.IMG$i"},1);
79: if (!defined($subimage)) {
80: &Apache::lonnet::logthis('Unable to create image object for '.
81: $ENV{"form.BGIMG"});
82: next;
83: }
84: $image->copy($subimage,$ENV{"form.IX$i"},$ENV{"form.IY$i"},
85: 0,0,$subimage->getBounds());
86: }
87: my $height=GD::Font->Giant->height;
88: for(my $i=0;$i<$ENV{"form.COUNT"};$i++) {
89: $image->string(gdGiantFont,$ENV{"form.X$i"},$ENV{"form.Y$i"}-$height,
90: $ENV{"form.LB$i"},$black);
91: }
92: for(my $i=0;$i<$ENV{"form.LINECOUNT"};$i++) {
93: my $x1=$ENV{"form.LINEX1$i"};
94: my $y1=$ENV{"form.LINEY1$i"};
95: my $x2=$ENV{"form.LINEX2$i"};
96: my $y2=$ENV{"form.LINEY2$i"};
97: my $width=$ENV{"form.LINEW$i"};
98: my $color=$ENV{"form.LINEC$i"};
99: my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
100: $red=hex($red);$green=hex($green);$blue=hex($blue);
101: my $imcolor;
102: if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
103: $imcolor = $image->colorClosestHWB($red,$green,$blue);
104: }
105: $image->setThickness($width);
106: $image->line($x1,$y1,$x2,$y2,$imcolor);
107: }
108: $image->setThickness(1);
109: $r->print($image->png);
110: return OK;
111: }
112:
113: 1;
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