# The LearningOnline Network with CAPA
# programatic image drawing
#
# $Id: drawimage.pm,v 1.12 2024/04/05 04:05:08 raeburn 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/
#
package Apache::drawimage;
use strict;
use Apache::loncommon;
use Apache::lonnet;
use Apache::lonxml;
use lib '/home/httpd/lib/perl/';
use Time::HiRes qw(gettimeofday);
use LONCAPA;
my %args;
my $cgi_id;
my @cgi_ids;
BEGIN {
&Apache::lonxml::register('Apache::drawimage',('drawimage'));
}
sub start_drawimage {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
&Apache::lonxml::register('Apache::drawimage',('text','line','rectangle','arc','fill','polygon','image'));
if ($target eq 'web' || $target eq 'tex') {
my $new_id=&Apache::loncommon::get_cgi_id();
if ($cgi_id) { push(@cgi_ids,$cgi_id); } else { undef(%args); }
$cgi_id=$new_id;
}
return '';
}
sub end_drawimage {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
# need to call rand everytime start_script would evaluate, as the
# safe space rand number generator and the global rand generator
# are not separate
my $randnumber;
if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
$target eq 'answer') {
$randnumber=int(rand(1000));
}
if ($target eq 'web' || $target eq 'tex') {
my $width = &Apache::lonxml::get_param('width',$parstack,$safeeval);
my $height =&Apache::lonxml::get_param('height',$parstack,$safeeval);
my $bgcolor =&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
if (!$width) { $width=300; }
if (!$height) { $height=300; }
$args{"cgi.$cgi_id.BGCOLOR"}=join(':',($bgcolor));
if ($target eq 'tex') {
my $texwidth=&Apache::lonxml::get_param('texwidth',$parstack,$safeeval,undef,1);
if (!$texwidth) { $texwidth='90'; }
$args{"cgi.$cgi_id.SIZE"}=join(':',($width,$height,$texwidth));
my $tmpdir = LONCAPA::tempdir(); # Where temporary files live:
## Determine filename
my ($seconds, $microseconds) = gettimeofday;
my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
'_'.$seconds.'_'.$microseconds.'_'.$$.$randnumber.'_drawimage.eps';
$args{"cgi.$cgi_id.EPSFILE"} = $env{'user.name'}.'_'.$env{'user.domain'}.
'_'.$seconds.'_'.$microseconds.'_'.$$.$randnumber.
'_drawimage.eps';
$result = "%DYNAMICIMAGE:$width:$height:$texwidth\n";
$result .= '\graphicspath{{'.$tmpdir.'}}'."\n";
$result .= '\includegraphics[width='.$texwidth.' mm]{'.$filename.'}';
&Apache::lonxml::register_ssi('/adm/randomlabel.png?token='.$cgi_id);
} else {
$args{"cgi.$cgi_id.SIZE"}=join(':',($width,$height));
$result.="<img width='$width' height='$height'
src='/adm/randomlabel.png?token=$cgi_id' />\n";
}
&Apache::lonnet::appenv(\%args);
if (@cgi_ids) {
$cgi_id=pop(@cgi_ids);
} else {
undef($cgi_id);
}
} elsif ($target eq 'edit') {
} elsif ($target eq 'modified') {
}
&Apache::lonxml::register('Apache::drawimage',
('text','line','rectangle','arc','fill',
'polygon'));
return $result;
}
sub start_text {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web' || $target eq 'tex') {
&Apache::lonxml::startredirection();
}
return $result;
}
sub end_text {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web' || $target eq 'tex') {
my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
my $font = &Apache::lonxml::get_param('font',$parstack,$safeeval);
my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
my $direction = &Apache::lonxml::get_param('direction',$parstack,$safeeval);
my $rotation = &Apache::lonxml::get_param('rotation',$parstack,$safeeval);
my $text = &Apache::lonxml::endredirection();
$text = &escape($text);
$args{"cgi.$cgi_id.OBJTYPE"}.='LABEL:';
my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
$args{"cgi.$cgi_id.OBJ$i"}=join(':',($x,$y,$text,$font,$color,$direction,$rotation));
}
return $result;
}
sub start_line {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web' || $target eq 'tex') {
my $x1 = &Apache::lonxml::get_param('x1',$parstack,$safeeval);
my $y1 = &Apache::lonxml::get_param('y1',$parstack,$safeeval);
my $x2 = &Apache::lonxml::get_param('x2',$parstack,$safeeval);
my $y2 = &Apache::lonxml::get_param('y2',$parstack,$safeeval);
my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
my $thickness = &Apache::lonxml::get_param('thickness',$parstack,$safeeval);
my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
$args{"cgi.$cgi_id.OBJ$i"}=join(':',($x1,$y1,$x2,$y2,$color,$thickness));
$args{"cgi.$cgi_id.OBJTYPE"}.='LINE:';
}
return $result;
}
sub end_line {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
return $result;
}
sub start_rectangle {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web' || $target eq 'tex') {
my $x1 = &Apache::lonxml::get_param('x1',$parstack,$safeeval);
my $y1 = &Apache::lonxml::get_param('y1',$parstack,$safeeval);
my $x2 = &Apache::lonxml::get_param('x2',$parstack,$safeeval);
my $y2 = &Apache::lonxml::get_param('y2',$parstack,$safeeval);
my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
my $thickness = &Apache::lonxml::get_param('thickness',$parstack,
$safeeval);
my $filled = &Apache::lonxml::get_param('filled',$parstack,
$safeeval);
my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
$args{"cgi.$cgi_id.OBJ$i"}=
join(':',($x1,$y1,$x2,$y2,$color,$thickness,$filled));
$args{"cgi.$cgi_id.OBJTYPE"}.='RECTANGLE:';
}
return $result;
}
sub end_rectangle {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
return $result;
}
sub start_arc {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web' || $target eq 'tex') {
my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
my $width = &Apache::lonxml::get_param('width',$parstack,$safeeval);
my $height = &Apache::lonxml::get_param('height',$parstack,$safeeval);
my $start = &Apache::lonxml::get_param('start',$parstack,$safeeval);
my $end = &Apache::lonxml::get_param('end',$parstack,$safeeval);
my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
my $thickness = &Apache::lonxml::get_param('thickness',$parstack,$safeeval);
my $filled = &Apache::lonxml::get_param('filled',$parstack,$safeeval);
my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
$args{"cgi.$cgi_id.OBJ$i"}=
join(':',($x,$y,$width,$height,$start,$end,$color,$thickness,
$filled));
$args{"cgi.$cgi_id.OBJTYPE"}.='ARC:';
}
return $result;
}
sub end_arc {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
return $result;
}
sub start_fill {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web' || $target eq 'tex') {
my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
my $color = &Apache::lonxml::get_param('color',$parstack,$safeeval);
my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
$args{"cgi.$cgi_id.OBJ$i"}=join(':',($x,$y,$color));
$args{"cgi.$cgi_id.OBJTYPE"}.='FILL:';
}
return $result;
}
sub end_fill {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
return $result;
}
my @polygon;
sub start_polygon {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
&Apache::lonxml::register('Apache::drawimage',('point'));
if ($target eq 'web') {
undef(@polygon);
}
return $result;
}
sub end_polygon {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web') {
my $color=&Apache::lonxml::get_param('color',$parstack,$safeeval);
my $filled=&Apache::lonxml::get_param('filled',$parstack,$safeeval);
my $open=&Apache::lonxml::get_param('open',$parstack,$safeeval);
my $thickness = &Apache::lonxml::get_param('thickness',$parstack,
$safeeval);
my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
$args{"cgi.$cgi_id.OBJTYPE"}.='POLYGON:';
$args{"cgi.$cgi_id.OBJ$i"}=join(':',($color,$thickness,$open,$filled));
$args{"cgi.$cgi_id.OBJEXTRA$i"}=join('-',@polygon);
}
&Apache::lonxml::deregister('Apache::drawimage',('point'));
return $result;
}
sub start_point {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web') {
my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
push (@polygon,"($x,$y)");
}
return $result;
}
sub end_point {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
return $result;
}
sub start_image {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web' || $target eq 'tex') {
&Apache::lonxml::startredirection();
}
return $result;
}
sub end_image {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result;
if ($target eq 'web' || $target eq 'tex') {
my $bgimg=&Apache::lonxml::endredirection();
my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
my $clipx = &Apache::lonxml::get_param('clipx',$parstack,$safeeval);
my $clipy = &Apache::lonxml::get_param('clipy',$parstack,$safeeval);
my $clipwidth =
&Apache::lonxml::get_param('clipwidth',$parstack,$safeeval);
my $clipheight =
&Apache::lonxml::get_param('clipheight',$parstack,$safeeval);
my $scaledwidth =
&Apache::lonxml::get_param('scaledwidth',$parstack,$safeeval);
my $scaledheight =
&Apache::lonxml::get_param('scaledheight',$parstack,$safeeval);
my $transparent =
&Apache::lonxml::get_param('transparent',$parstack,$safeeval);
$bgimg=&Apache::imageresponse::clean_up_image($bgimg);
my $i=$args{"cgi.$cgi_id.OBJCOUNT"}++;
$args{"cgi.$cgi_id.OBJTYPE"}.='IMAGE:';
$args{"cgi.$cgi_id.OBJ$i"} =
join(':',($x,$y,&escape($bgimg),$transparent,
$clipx,$clipy,$scaledwidth,$scaledheight,$clipwidth,$clipheight));
}
return $result;
}
1;
__END__
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>