# $Id: imagechoice.pm,v 1.4 2004/02/17 22:02:05 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/cgi-bin/plot.gif
#
# http://www.lon-capa.org/
#
package Apache::imagechoice;
use strict;
use Apache::Constants qw(:common :http);
sub deletedata {
my ($id)=@_;
&Apache::lonnet::delenv("imagechoice\\.$id\\.coords");
}
sub closewindow {
my ($r,$output,$filename,$needimage)=@_;
if ($needimage) {
$needimage="";
}
$r->print(<<"ENDSUBM");
Position Selected
$needimage
ENDSUBM
}
sub storedata {
my ($r,$type,$filename,$id)=@_;
my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
my ($output,$needimage);
if ($ENV{"imagechoice.$id.formwidth"}) {
$output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
$needimage=1;
}
if ($ENV{"imagechoice.$id.formheight"}) {
$output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
$needimage=1;
}
if ($type eq 'point') {
my (undef,$x,$y)=split(':',$ENV{"imagechoice.$id.coords"});
if ($ENV{"imagechoice.$id.formx"}) {
$output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formx"}.'.value='.$x.';';
}
if ($ENV{"imagechoice.$id.formy"}) {
$output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formy"}.'.value='.$y.';';
}
} elsif ($type eq 'polygon' or $type eq 'box') {
my $coordstr;
while (@coords) {
$coordstr.='('.shift(@coords).','.shift(@coords).')-';
}
chop($coordstr);
$output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
}
&deletedata($id);
&closewindow($r,$output,$filename,$needimage);
}
sub getcoord {
my ($r,$type,$filename,$id)=@_;
my $heading='Select Position on Image';
my $nextstage='';
if ($type eq 'box') {
my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
my $step=scalar(@coords)/2;
if ($step == 0) {
$heading='Select First Coordinate on Image';
#$nextstage='';
} elsif ($step == 1) {
$heading='Select Second Coordinate on Image';
#$nextstage='';
} else {
$heading='Select Finish to store selection.';
$nextstage='';
}
} elsif ($type eq 'polygon') {
$heading='Enter Coordinate or click finish to close Polygon';
$nextstage='';
} elsif ($type eq 'point') {
$heading='Click to select a Coordinate or click Finish to store current selection.';
$nextstage='';
}
$r->print(<<"END");
$heading
END
}
sub savecoord {
my ($id,$type)=@_;
if (defined($ENV{"form.image.x"}) && defined($ENV{"form.image.y"})) {
my $data;
if ($type eq 'point') {
$data=join(':',(undef,$ENV{"form.image.x"},$ENV{"form.image.y"}));
} else {
$data=join(':',($ENV{"imagechoice.$id.coords"},
$ENV{"form.image.x"},$ENV{"form.image.y"}));
}
&Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
}
return int(scalar(split(':',$ENV{"imagechoice.$id.coords"}))/2);
}
sub drawX {
my ($imid,$x,$y)=@_;
my %x;
$x{"cgi.$imid.LINECOUNT"}=4;
my $length = 6;
my $width = 1;
my $extrawidth = 2;
$x{"cgi.$imid.LINE0"}=
join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
"FFFFFF",($width+$extrawidth)));
$x{"cgi.$imid.LINE1"}=
join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
"FFFFFF",($width+$extrawidth)));
$x{"cgi.$imid.LINE2"}=
join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
"FF0000",($width)));
$x{"cgi.$imid.LINE3"}=
join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
"FF0000",($width)));
return %x;
}
sub drawPolygon {
my ($id,$imid)=@_;
my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
my $coordstr;
while (@coords) {
$coordstr.='('.shift(@coords).','.shift(@coords).')-';
}
chop($coordstr);
my %x;
my $width = 1;
my $extrawidth = 2;
my $i=$x{"cgi.$imid.POLYCOUNT"}++;
$x{"cgi.$imid.POLYOPT$i"}=join(':',("FFFFFF",($width+$extrawidth)),'1');
$x{"cgi.$imid.POLY$i"}=$coordstr;
$i=$x{"cgi.$imid.POLYCOUNT"}++;
$x{"cgi.$imid.POLYOPT$i"}=join(':',("00FF00",$width),'1');
$x{"cgi.$imid.POLY$i"}=$coordstr;
return %x;
}
sub drawBox {
my ($id,$imid)=@_;
my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
my %x;
if (scalar(@coords) < 4) { return %x; }
my $width = 1;
my $extrawidth = 2;
my $i=$x{"cgi.$imid.BOXCOUNT"}++;
$x{"cgi.$imid.BOX$i"}=join(':',(@coords,"FFFFFF",($width+$extrawidth)));
$i=$x{"cgi.$imid.BOXCOUNT"}++;
$x{"cgi.$imid.BOX$i"}=join(':',(@coords,"00FF00",$width));
return %x;
}
sub drawimage {
my ($r,$type,$filename,$id)=@_;
my $imid=&Apache::loncommon::get_cgi_id();
my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
my %data;
$data{"cgi.$imid.BGIMG"}=$filename;
my $x=$coords[-2];
my $y=$coords[-1];
%data=(%data,&drawX($imid,$x,$y));
if ($type eq "polygon") { %data=(%data,&drawPolygon($id,$imid)); }
if ($type eq "box") { %data=(%data,&drawBox($id,$imid)); }
&Apache::lonnet::appenv(%data);
return "/adm/randomlabel.png?token=$imid"
}
sub handler {
my ($r)=@_;
$r->content_type('text/html');
my %data;
my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
my $filename = &Apache::lonnet::unescape($ENV{"imagechoice.$id.file"});
my $formname = $ENV{"imagechoice.$id.formname"};
if ($ENV{'form.cancel'} eq 'Cancel') {
&deletedata($id);
&closewindow($r,'',$filename);
return OK;
}
my $type=$ENV{"imagechoice.$id.type"};
if (defined($ENV{'form.type'})) { $type=$ENV{'form.type'}; }
my $numcoords=&savecoord($id,$type);
&Apache::lonnet::logthis("num coords is $numcoords");
my $imurl=&drawimage($r,$type,$filename,$id);
if (($ENV{'form.finish'} eq 'Finish')) {
&storedata($r,$type,$imurl,$id);
} else {
&getcoord($r,$type,$imurl,$id);
}
return OK;
}
1;
__END__