File:
[LON-CAPA] /
loncom /
homework /
randomlylabel.pm
Revision
1.20:
download - view:
text,
annotated -
select for diffs
Thu Jul 15 18:06:09 2004 UTC (20 years, 1 month ago) by
albertel
Branches:
MAIN
CVS tags:
version_1_2_X,
version_1_2_1,
version_1_2_0,
version_1_1_99_5,
version_1_1_99_4,
version_1_1_99_3,
HEAD
- BUG#3213, Fedora Core 2 GD isn't reading pallatized PNGs corectly, force them to truecolor mode
#!/usr/bin/perl
# The LearningOnline Network with CAPA
# randomlabel.png: composite together text and images into 1 image
#
# $Id: randomlylabel.pm,v 1.20 2004/07/15 18:06:09 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/
#
###
package Apache::randomlylabel;
use strict;
use Image::Magick;
use Apache::Constants qw(:common);
use Apache::loncommon();
use GD;
use GD::Polyline();
use LWP::UserAgent();
sub get_image {
my ($imgsrc,$set_trans)=@_;
my $image;
if ($imgsrc !~ m|^(/home/)|) {
if ($imgsrc !~ /^http:/) {
$imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
}
my $ua=new LWP::UserAgent;
my $request=new HTTP::Request('GET',"$imgsrc");
$request->header(Cookie => $ENV{'HTTP_COOKIE'});
my $file="/tmp/imagetmp".$$;
my $response=$ua->request($request,$file);
if ($response->is_success) {
if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
my $conv_image = Image::Magick->new;
my $current_figure = $conv_image->Read('filename'=>$file);
$conv_image->Set('type'=>'TrueColor');
$conv_image->Set('magick'=>'png');
my @blobs=$conv_image->ImageToBlob();
undef $conv_image;
$image = GD::Image->new($blobs[0]);
} else {
GD::Image->trueColor(1);
$image = GD::Image->new($file);
}
}
} elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
my $conv_image = Image::Magick->new;
my $current_figure = $conv_image->Read('filename'=>$imgsrc);
$conv_image->Set('type'=>'TrueColor');
$conv_image->Set('magick'=>'png');
my @blobs=$conv_image->ImageToBlob();
undef $conv_image;
$image = GD::Image->new($blobs[0]);
} else {
$image = GD::Image->trueColor(1);
$image = GD::Image->new($imgsrc);
}
if ($set_trans && defined($image)) {
my $white=$image->colorExact(255,255,255);
if ($white != -1) { $image->transparent($white); }
}
return $image;
}
sub get_color_from_hexstring {
my ($image,$color)=@_;
if (!$color) { $color='000000'; }
my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
$red=hex($red);$green=hex($green);$blue=hex($blue);
my $imcolor;
if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
$imcolor = $image->colorClosestHWB($red,$green,$blue);
}
return $imcolor;
}
sub handler {
my $r = shift;
$r->content_type('image/png');
$r->send_http_header;
my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
my $image;
if (defined($ENV{"cgi.$id.BGIMG"})) {
my $bgimg=&Apache::lonnet::unescape($ENV{"cgi.$id.BGIMG"});
#&Apache::lonnet::logthis("BGIMG is ".$bgimg);
$image=&get_image($bgimg,0);
if (! defined($image)) {
&Apache::lonnet::logthis('Unable to create image object for -'.
$id.'-'.$bgimg);
return OK;
}
} elsif (defined($ENV{"cgi.$id.SIZE"})) {
my ($width,$height)=split(':',$ENV{"cgi.$id.SIZE"});
$image = new GD::Image($width,$height,1);
my ($bgcolor)=split(':',$ENV{"cgi.$id.BGCOLOR"});
if ($bgcolor ne 'transparent') {
$bgcolor=&get_color_from_hexstring($image,$bgcolor);
# $image->rectangle(0,0,$width,$height,$bgcolor);
$image->fill(0,0,$bgcolor);
} else {
$bgcolor=&get_color_from_hexstring($image,'FFFFFF');
$image->fill(0,0,$bgcolor);
$image->transparent($bgcolor);
}
} else {
&Apache::lonnet::logthis('Unable to create image object, no info');
return OK;
}
#binmode(STDOUT);
my @objtypes=split(':',$ENV{"cgi.$id.OBJTYPE"});
foreach(my $i=0;$i<$ENV{"cgi.$id.OBJCOUNT"};$i++) {
my $type=shift(@objtypes);
if ($type eq 'LINE') {
my ($x1,$y1,$x2,$y2,$color,$thickness)=
split(':',$ENV{"cgi.$id.OBJ$i"});
my $imcolor=&get_color_from_hexstring($image,$color);
if (!defined($thickness)) { $thickness=1; }
$image->setThickness($thickness);
$image->setAntiAliased($imcolor);
$image->line($x1,$y1,$x2,$y2,gdAntiAliased);
} elsif ($type eq 'RECTANGLE') {
my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
split(':',$ENV{"cgi.$id.OBJ$i"});
if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
my $imcolor=&get_color_from_hexstring($image,$color);
if (!defined($thickness)) { $thickness=1; }
$image->setThickness($thickness);
# $image->setAntiAliased($imcolor);
if ($filled) {
$image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
} else {
$image->rectangle($x1,$y1,$x2,$y2,$imcolor);
}
} elsif ($type eq 'POLYGON') {
my ($color,$width,$open)=split(':',$ENV{"cgi.$id.OBJ$i"});
my $imcolor=&get_color_from_hexstring($image,$color);
my $polygon = (($open) ? (new GD::Polyline) : (new GD::Polygon));
my $added=0;
foreach my $coord (split('-',$ENV{"cgi.$id.OBJEXTRA$i"})) {
my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
$polygon->addPt($x,$y);
$added++;
}
$image->setThickness($width);
if ($added) {
if ($open) {
$image->polydraw($polygon,$imcolor);
} else {
$image->polygon($polygon,$imcolor);
}
}
} elsif ($type eq 'ARC') {
my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
split(':',$ENV{"cgi.$id.OBJ$i"});
if (!$color) { $color='000000'; }
my $imcolor=&get_color_from_hexstring($image,$color);
if (!defined($thickness)) { $thickness=1; }
$image->setThickness($thickness);
# $image->setAntiAliased($imcolor);
if ($filled) {
$image->filledArc($x,$y,$width,$height,$start,$end,
$imcolor);
} else {
$image->arc($x,$y,$width,$height,$start,$end,$imcolor);
}
} elsif ($type eq 'FILL') {
my ($x,$y,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
if (!$color) { $color='000000'; }
my $imcolor=&get_color_from_hexstring($image,$color);
$image->fill($x,$y,$imcolor);
} elsif ($type eq 'IMAGE') {
my ($x,$y,$file,$transparent)=split(':',$ENV{"cgi.$id.OBJ$i"});
$file=&Apache::lonnet::unescape($file);
if (!defined($transparent)) { $transparent=1; }
my $subimage=&get_image($file,$transparent);
if (!defined($subimage)) {
&Apache::lonnet::logthis('Unable to create image object for '.
$file);
next;
}
$image->copy($subimage,$x,$y,0,0,$subimage->getBounds());
} elsif ($type eq 'LABEL') {
my ($x,$y,$text,$font,$color,$direction)=
split(':',$ENV{"cgi.$id.OBJ$i"});
$text=&Apache::lonnet::unescape($text);
my $imcolor=&get_color_from_hexstring($image,$color);
my $type='normal';
my ($height,$fontref);
if ($font eq 'tiny') {
$height=GD::Font->Tiny->height;
$fontref=GD::gdTinyFont;
} elsif ($font eq 'small') {
$height=GD::Font->Small->height;
$fontref=GD::gdSmallFont;
} elsif ($font eq 'medium') {
$height=GD::Font->MediumBold->height;
$fontref=GD::gdMediumBoldFont;
} elsif ($font eq 'large') {
$height=GD::Font->Large->height;
$fontref=GD::gdLargeFont;
} elsif ($font eq 'giant' || !defined($font)) {
$height=GD::Font->Giant->height;
$fontref=GD::gdGiantFont;
} else {
$type='ttf';
}
if ($type eq 'normal' && $direction eq 'vertical') {
$image->stringUp($fontref,$x,$y-$height,$text,$imcolor);
} elsif ($type eq 'normal') {
$image->string($fontref,$x,$y-$height,$text,$imcolor);
} elsif ($type eq 'ttf') {
my ($fontname,$ptsize)=split(/\s+/,$font);
$image->stringFT($imcolor,$fontname,$ptsize,90,$x,$y,$text);
}
} else {
&Apache::lonnet::logthis("randomlylabel unable to handle object of type $type");
}
}
$image->setThickness(1);
$r->print($image->png);
return OK;
}
1;
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>