#!/usr/bin/perl
# The LearningOnline Network with CAPA
# randomlabel.png: composite together text and images into 1 image
#
# $Id: randomlabel.png,v 1.1 2002/11/07 19:48:51 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
###

use strict;
use Image::Magick;

sub unescape {
    my $str=shift;
    $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
    return $str;
}

sub add_to_env {
  my ($name,$value)=@_;
  if (defined($ENV{$name})) {
    if (ref($ENV{$name})) {
      #already have multiple values
      push(@{ $ENV{$name} },$value);
    } else {
      #first time seeing multiple values, convert hash entry to an arrayref
      my $first=$ENV{$name};
      undef($ENV{$name});
      push(@{ $ENV{$name} },$first,$value);
    }
  } else {
    $ENV{$name}=$value;
  }
}

sub get_unprocessed_cgi {
  my ($query,$possible_names)= @_;
  # $Apache::lonxml::debug=1;
  foreach (split(/&/,$query)) {
    my ($name, $value) = split(/=/,$_);
    $name = &unescape($name);
    if (!defined($possible_names) || (grep {$_ eq $name} @$possible_names)) {
      $value =~ tr/+/ /;
      $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
      unless (defined($ENV{'form.'.$name})) { &add_to_env('form.'.$name,$value) };
    }
  }
}

sub main {
    print <<END;
Content-type: image/png

END
    &get_unprocessed_cgi($ENV{'QUERY_STRING'});
    my $image = Image::Magick->new;
#    foreach my $envkey (sort(keys(%ENV))) {
#	print("$envkey => $ENV{$envkey}\n");
#    }
  my $current_figure = $image->Read('filename'=>$ENV{"form.BGIMG"});
    binmode(STDOUT);
#    for(my $i=0;$i<$ENV{"form.ICOUNT"};$i++) {
#
#    }
    for(my $i=0;$i<$ENV{"form.COUNT"};$i++) {
	$image->Annotate('text' => $ENV{"form.LB$i"},'x' => $ENV{"form.X$i"},
			 'y' => $ENV{"form.Y$i"}, 'font' => 'Times-Bold',
			 'pointsize' => 18, 'antialias' => 'true');
    }
    $image->Write('png:-');
    my @fonts=$image->QueryFont();
#    print(join(':',@fonts));

}

&main();