# $Id: imagechoice.pm,v 1.18 2014/02/14 17:01:30 bisitz 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);
use Apache::lonnet;
use Apache::lonlocal;
use LONCAPA;
sub deletedata {
my ($id)=@_;
&Apache::lonnet::delenv('imagechoice.'.$id.'.coords');
}
sub closewindow {
my ($r,$output,$filename,$needimage,$display)=@_;
if ($needimage) {
$needimage="";
}
my $js=<<"ENDSUBM";
ENDSUBM
my $start_page =
&Apache::loncommon::start_page('Close Window',$js,
{'bgcolor' => '#FFFFFF',
'only_body' => 1,
'add_entries' => {
onload => 'submitthis();'},});
my $end_page =
&Apache::loncommon::end_page();
$r->print(
$start_page
.'
'.&mt('The X coordinate is [_1]',$x)."
\n"; } if ($env{"imagechoice.$id.formy"}) { $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formy"}.'.value='.$y.';'; $display.=''.&mt('The Y coordinate is [_1]',$y)."
\n"; } } elsif ($type eq 'polygon' or $type eq 'box') { my $coordstr; while (@coords) { $coordstr.='('.shift(@coords).','.shift(@coords).')-'; } chop($coordstr); $display.=''.&mt('The selected coordinates are [_1]',"$coordstr")."
\n"; $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";'; } if ($display) { $display.='' .&mt('If this window fails to close you may need to manually replace the old coordinates with the above value.') ."
\n"; } &deletedata($id); &closewindow($r,$output,$filename,$needimage,$display); } sub getcoord { my ($r,$type,$filename,$id)=@_; my $heading=&mt('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) { $heading=&mt('Select First Coordinate on Image.'); #$nextstage=''; } elsif ($step == 1) { $heading=&mt('Select Second Coordinate on Image.'); #$nextstage=''; } else { $heading=&mt('Select [_1] to save selection.','"'.&mt('Save').'"'); $nextstage=''; } } elsif ($type eq 'polygon') { $heading=&mt('Click to select a Coordinate or click [_1] to close Polygon.', '"'.&mt('Save').'"'); $nextstage=''; } elsif ($type eq 'point') { $heading=&mt('Click to select a Coordinate or click [_1] to save current selection.', '"'.&mt('Save').'"'); $nextstage=''; } my $headline = 'Get Coordinates'; my $start_page = &Apache::loncommon::start_page($headline,undef, {'bgcolor' => '#FFFFFF', 'only_body' => 1,}); my $end_page = &Apache::loncommon::end_page(); $headline = &mt($headline); my $canceltext=&mt('Cancel'); $r->print(<<"END"); $start_page$heading
$end_page END } sub savecoord { my ($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 add_obj { my ($x,$id,$type,$args,$extra)=@_; $$x{"cgi.$id.OBJTYPE"}.=$type.':'; my $i=$$x{"cgi.$id.OBJCOUNT"}++; $$x{"cgi.$id.OBJ$i"}=$args; if (defined($extra)) { $$x{"cgi.$id.OBJEXTRA$i"}=$extra; } } sub drawX { my ($data,$imid,$x,$y)=@_; my $length = 6; my $width = 1; my $extrawidth = 2; &add_obj($data,$imid,'LINE', join(':',(($x-$length),($y-$length),($x+$length),($y+$length), "FFFFFF",($width+$extrawidth)))); &add_obj($data,$imid,'LINE', join(':',(($x-$length),($y+$length),($x+$length),($y-$length), "FFFFFF",($width+$extrawidth)))); &add_obj($data,$imid,'LINE', join(':',(($x-$length),($y-$length),($x+$length),($y+$length), "FF0000",($width)))); &add_obj($data,$imid,'LINE', join(':',(($x-$length),($y+$length),($x+$length),($y-$length), "FF0000",($width)))); } sub drawPolygon { my ($data,$id,$imid)=@_; my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"}); my $coordstr; while (@coords) { $coordstr.='('.shift(@coords).','.shift(@coords).')-'; } chop($coordstr); my $width = 1; my $extrawidth = 2; &add_obj($data,$imid,'POLYGON', join(':',("FFFFFF",($width+$extrawidth)),'1'),$coordstr); &add_obj($data,$imid,'POLYGON', join(':',("00FF00",($width)),'1'),$coordstr); } sub drawBox { my ($data,$id,$imid)=@_; my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"}); if (scalar(@coords) < 4) { return ''; } my $width = 1; my $extrawidth = 2; &add_obj($data,$imid,'RECTANGLE', join(':',(@coords,"FFFFFF",($width+$extrawidth)))); &add_obj($data,$imid,'RECTANGLE',join(':',(@coords,"00FF00",$width))); } 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]; &drawX(\%data,$imid,$x,$y); if ($type eq "polygon") { &drawPolygon(\%data,$id,$imid); } if ($type eq "box") { &drawBox(\%data,$id,$imid); } &Apache::lonnet::appenv(\%data); return "/adm/randomlabel.png?token=$imid" } sub handler { my ($r)=@_; &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; my %data; my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'}); my $filename = &unescape($env{"imagechoice.$id.file"}); my $formname = $env{"imagechoice.$id.formname"}; if ($env{'form.cancel'}) { # eq &mt('Cancel')) { &deletedata($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); my $imurl=&drawimage($r,$type,$filename,$id); if ($env{'form.finish'}) { # eq &mt('Save')) { &storedata($r,$type,$imurl,$id); } else { &getcoord($r,$type,$imurl,$id); } return OK; } 1; __END__