# The LearningOnline Network with CAPA
# programatic image drawing
#
# $Id: drawimage.pm,v 1.14 2024/04/09 20:01:31 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 Apache::edit;
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'));
    push(@Apache::lonxml::namespace,'drawimage');
    my $result;
    if ($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;
    } elsif ($target eq 'edit') {
        $result .= &Apache::edit::tag_start($target,$token).
            &Apache::edit::text_arg('Background color:','bgcolor' ,$token,8).
            &Apache::edit::text_arg('Width(pixel):'    ,'width'   ,$token,6).
            &Apache::edit::text_arg('Height(pixel):'   ,'height'  ,$token,6).
            &Apache::edit::text_arg('TeXWidth(mm):'    ,'texwidth',$token,6).
            &Apache::edit::end_row().&Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'bgcolor','width',
                                                     'height','texwidth');
        if ($constructtag) {
            $result = &Apache::edit::rebuild_tag($token);
        }
    }
    return $result;
}

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') {
        $result.=&Apache::edit::end_table;
    }
    pop(@Apache::lonxml::namespace);
    &Apache::lonxml::deregister('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' || $target eq 'tex') {
	&Apache::lonxml::startredirection();
    } elsif ($target eq 'edit') {
        $result =
            &Apache::edit::tag_start($target,$token).
            &Apache::edit::text_arg('x:','x',$token,6).
            &Apache::edit::text_arg('y:','y',$token,6).
            &Apache::edit::text_arg('font:','font',$token,12).
            &Apache::edit::text_arg('color:','color',$token,8).
            &Apache::edit::select_arg('direction:','direction',
                                      ['vertical','horizontal'],$token).
            &Apache::edit::text_arg('rotation:','rotation',$token,6);
        my $text=&Apache::lonxml::get_all_text('/text',$parser,$style);
        $result .=
            &Apache::edit::editfield($token->[1],$text,'Text',60,2).
            &Apache::edit::end_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'x','y',
                                                     'font','color',
                                                     'direction','rotation');
        if ($constructtag) {
            $result = &Apache::edit::rebuild_tag($token);
        } else {
            $result = $token->[4];
        }
        $result .= &Apache::edit::modifiedfield('/text',$parser);
    }
    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));
    } elsif ($target eq 'edit') {
        $result=&Apache::edit::end_table();
    }
    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:';
    } elsif ($target eq 'edit') {
        $result .=
            &Apache::edit::tag_start($target,$token).
            &Apache::edit::text_arg('x1:','x1' ,$token,6).
            &Apache::edit::text_arg('y1:','y1' ,$token,6).
            &Apache::edit::text_arg('x2:','x2' ,$token,6).
            &Apache::edit::text_arg('y2:','y2' ,$token,6).
            &Apache::edit::text_arg('color:','color',$token,8).
            &Apache::edit::text_arg('thickness:','thickness',$token,6).
            &Apache::edit::end_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'x1','y1',
                                                     'x2','y2','color','thickness');
        if ($constructtag) { 
            $result = &Apache::edit::rebuild_tag($token);
        }
    }
    return $result;
}

sub end_line {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'edit') {
        $result=&Apache::edit::end_table();
    }
    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:';
    } elsif ($target eq 'edit') {
        $result .=
            &Apache::edit::tag_start($target,$token).
            &Apache::edit::text_arg('x1:','x1' ,$token,6).
            &Apache::edit::text_arg('y1:','y1' ,$token,6).
            &Apache::edit::text_arg('x2:','x2' ,$token,6).
            &Apache::edit::text_arg('y2:','y2' ,$token,6).
            &Apache::edit::text_arg('color:','color',$token,8).
            &Apache::edit::text_arg('thickness:','thickness',$token,6).
            &Apache::edit::select_arg('filled:','filled',
                                      ['no','yes'],$token).
            &Apache::edit::end_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'x1','y1',
                                                     'x2','y2','color','thickness',
                                                     'filled');
        if ($constructtag) {
            $result = &Apache::edit::rebuild_tag($token);
        }
    }
    return $result;
}

sub end_rectangle {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'edit') {
        $result=&Apache::edit::end_table();
    }
    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:';
    } elsif ($target eq 'edit') {
        $result .=
            &Apache::edit::tag_start($target,$token).
            &Apache::edit::text_arg('x:','x',$token,6).
            &Apache::edit::text_arg('y:','y',$token,6).
            &Apache::edit::text_arg('width:','width',$token,6).
            &Apache::edit::text_arg('height:','height',$token,6).
            &Apache::edit::text_arg('start:','start',$token,6).
            &Apache::edit::text_arg('end:','end',$token,6).
            &Apache::edit::text_arg('color:','color',$token,8).
            &Apache::edit::text_arg('thickness:','thickness',$token,6).
            &Apache::edit::select_arg('filled:','filled',
                                      ['no','yes'],$token).
            &Apache::edit::end_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'x','y',
                                                     'width','height',
                                                     'start','end',
                                                     'color','thickness',
                                                     'filled');
        if ($constructtag) {
            $result = &Apache::edit::rebuild_tag($token);
        }
    }
    return $result;
}

sub end_arc {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'edit') {
        $result=&Apache::edit::end_table();
    }
    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:';
    } elsif ($target eq 'edit') {
        $result .=
            &Apache::edit::tag_start($target,$token).
            &Apache::edit::text_arg('x:','x' ,$token,6).
            &Apache::edit::text_arg('y:','y' ,$token,6).
            &Apache::edit::text_arg('color:','color',$token,8).
            &Apache::edit::end_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'x','y',
                                                     'color');
        if ($constructtag) {
            $result = &Apache::edit::rebuild_tag($token);
        }
    }
    return $result;
}

sub end_fill {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'edit') {
        $result=&Apache::edit::end_table();
    }
    return $result;
}

my @polygon;
sub start_polygon {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    push(@Apache::lonxml::namespace,'polygon');
    &Apache::lonxml::register('Apache::drawimage',('point'));
    if ($target eq 'web' || $target eq 'tex') {
	undef(@polygon);
    } elsif ($target eq 'edit') {
        $result = 
            &Apache::edit::tag_start($target,$token).
            &Apache::edit::text_arg('color:','color',$token,8).
            &Apache::edit::select_arg('Open:','open',
                                           ['no','yes'],$token).
            &Apache::edit::select_arg('Filled:','filled',
                                           ['no','yes'],$token).
            &Apache::edit::text_arg('thickness:','thickness',$token,6).
            &Apache::edit::end_row().
            &Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'open','filled');
        if ($constructtag) {
            $result = &Apache::edit::rebuild_tag($token);
        }
    }
    return $result;
}

sub end_polygon {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;    
    if ($target eq 'web' || $target eq 'tex') {
	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$i"}=join('-',@polygon);
    } elsif ($target eq 'edit') {
        $result=&Apache::edit::end_table();
    }
    pop(@Apache::lonxml::namespace);
    &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' || $target eq 'tex') {
	my $x = &Apache::lonxml::get_param('x',$parstack,$safeeval);
        my $y = &Apache::lonxml::get_param('y',$parstack,$safeeval);
	push (@polygon,"($x,$y)");
    } elsif ($target eq 'edit') {
        $result.= 
            &Apache::edit::tag_start($target,$token).
            &Apache::edit::text_arg('x:','x' ,$token,6).
            &Apache::edit::text_arg('y:','y' ,$token,6).
            &Apache::edit::end_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'x','y');
        if ($constructtag) {
            $result = &Apache::edit::rebuild_tag($token);
        }
    }
    return $result;
}

sub end_point {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'edit') {
        $result=&Apache::edit::end_table();
    }
    return $result;
}

sub start_image {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'web' || $target eq 'tex') {
	&Apache::lonxml::startredirection();
    } elsif ($target eq 'edit') {
        my $bgimg=&Apache::lonxml::get_all_text('/image',$parser,$style);
        $Apache::edit::bgimgsrc=$bgimg;
        $Apache::edit::bgimgsrcdepth=$Apache::lonxml::curdepth;
        my $only = join(',',&Apache::loncommon::filecategorytypes('Pictures'));
        $result=&Apache::edit::tag_start($target,$token,'Background Image').
            &Apache::edit::editline($token->[1],$bgimg,'Image Source File',40).
            &Apache::edit::browse_or_search(undef,'textnode',undef,$only,undef,1).
            '<br />'.
            &Apache::edit::text_arg('x:','x',$token,6).
            &Apache::edit::text_arg('y:','y',$token,6).
            &Apache::edit::text_arg('clipx:','clipx',$token,6).
            &Apache::edit::text_arg('clipy:','clipy',$token,6).
            &Apache::edit::text_arg('Clip width(pixel):','clipwidth',$token,6).
            &Apache::edit::text_arg('Clip height(pixel):','clipheight',$token,6).
            &Apache::edit::text_arg('Scaled width:','scaledwidth',$token,6).
            &Apache::edit::text_arg('Scaled height:','scaledheight',$token,6).
            &Apache::edit::text_arg('Transparent:','transparent',$token,6).
            &Apache::edit::end_row();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'x','y',
                                                     'clipx','clipy','clipwidth','clipheight',
                                                     'scaledwidth','scaledheight','transparent');
        if ($constructtag) {
            $result = &Apache::edit::rebuild_tag($token);
        } else {
            $result = $token->[4];
        }
        $result .= &Apache::edit::modifiedfield('/image',$parser);
    }
    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));
    } elsif ($target eq 'edit') {
        $result=&Apache::edit::end_table();
    }
    return $result;
}
1;
__END__