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package SVG::SVG2zinc::Backend::Image;
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU LGPL Libray General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program 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 Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA,
# or refer to http://www.gnu.org/copyleft/lgpl.html
#
##################################################################
# Backend Class for SVG2zinc to generate image files
#
# Copyright 2003
# Centre d'Études de la Navigation Aérienne
#
# Author: Christophe Mertz <mertz at intuilab dot com>
#
# $Id: Image.pm.k,v 1.1.1.1 2006-10-20 13:34:31 merlin Exp $
#############################################################################
use SVG::SVG2zinc::Backend;
@ISA = qw( SVG::SVG2zinc::Backend );
use vars qw( $VERSION);
($VERSION) = sprintf("%d.%02d", q$Revision: 1.1.1.1 $ =~ /(\d+)\.(\d+)/);
use strict;
use Carp;
use Tk::Zinc::SVGExtension;
eval (require Tk::Zinc);
if ($@) {
print "$@\nSVG::SVG2zinc::Backend requires Tk::Zinc to be installed\n";
}
sub new {
# testing that 'import' is available
# is this test portable?
my $ret = `which import`;
croak ("## You need the 'import' command from 'imagemagic' package to use the Image backend.\n")
if !$ret;
my ($class, %passed_options) = @_;
my $self = {};
bless $self, $class;
$self->_initialize(%passed_options);
return $self;
}
my $zinc;
sub _initialize {
my ($self, %passed_options) = @_;
if (defined $passed_options{-ratio}) {
if ($passed_options{-ratio} !~ /^\d+%$/) {
croak ("## -ratio should look like nn%");
} else {
$self->{-ratio} = delete $passed_options{-ratio};
}
}
if (defined $passed_options{-width}) {
$self->{-width} = delete $passed_options{-width};
}
if (defined $passed_options{-height}) {
$self->{-height} = delete $passed_options{-height};
}
$self->SUPER::_initialize(%passed_options);
my $mw = MainWindow->new();
my $svgfile = $self->{-in};
$mw->title($svgfile);
my $render = (defined $self->{-render}) ? $self->{-render} : 1;
$zinc = $mw->Zinc(-borderwidth => 0,
-render => $render,
-backcolor => "white", ## why white?
)->pack(qw/-expand yes -fill both/);
}
sub treatLines {
my ($self,@lines) = @_;
my $verbose = $self->{-verbose};
foreach my $l (@lines) {
my $expr = $l;
$expr =~ s/->/\$zinc->/g;
my $unused = $zinc; ## due to a perl bug, this is needed so that $zinc will be known in $expr
my $r = eval ($expr);
if ($@) {
# &myWarn ("While evaluationg:\n$expr\nAn Error occured: $@\n");
print ("While evaluationg:\n$expr\nAn Error occured: $@\n");
} elsif ($verbose) {
if ($l =~ /^->add/) {
print "$r == $expr\n" if $verbose;
} else {
print "$expr\n" if $verbose;
}
}
}
}
sub fileHeader {
# my ($self) = @_;
}
sub fileTail {
my ($self) = @_;
my $outfile = $self->{-out};
# to find the top group containing width and height
my $svgGroup = $zinc->find('withtag', 'svg_top') ;
my $tags = join " ", $zinc->gettags($svgGroup);
# print "svgGroup=$svgGroup => $tags\n";
my ($width) = $tags =~ /width=(\d+)/ ;
my ($height) = $tags =~ /height=(\d+)/ ;
# print "height => $height width => $width\n";
$zinc->configure (-width => $width, -height => $height);
$zinc->update;
my $requiredWidth = $self->{-width};
my $requiredHeigth = $self->{-height};
my $importParams="";
if (defined $requiredWidth and defined $requiredHeigth) {
$importParams=" -resize $requiredWidth"."x$requiredHeigth";
} elsif (defined $self->{-ratio}) {
$importParams=" -resize ".$self->{-ratio};
}
# print "importParams=$importParams\n";
## following are for comments:
my ($svg2zincPackage) = caller;
my $VERSION = eval ( "\$".$svg2zincPackage."::VERSION" );
my $svgfile = $self->{-in};
my $command = "import -window " . $zinc->id . $importParams ." -comment 'created with SVG::SVG2zinc from $svgfile v$VERSION (c) CENA 2003 C.Mertz.' $outfile";
# print "command=$command\n";
my $return = system ($command);
if ($return) {
## -1 when import is not available
print "## To use the Image Backend you need the 'import' command\n";
print "## from the 'imagemagick' package on your system\n";
}
}
1;
__END__
=head1 NAME
SVG:SVG2zinc::Backend::Image - a backend class for generating image file from SVG file
=head1 DESCRIPTION
SVG:SVG2zinc::Backend::Image is a backend class for generating image file from SVG files. It uses the 'import' command included in the ImageMagick package.
For more information, you should look at SVG:SVG2zinc::Backend(3pm).
The new method accepts parameters described in the SVG:SVG2zinc::Backend class and the following additionnal parameters:
=over
=item B<none>
=back
=head1 SEE ALSO
SVG::SVG2zinc::Backend(3pm) and SVG::SVG2zinc(3pm)
=head1 BUGS and LIMITATIONS
This backend generates images files from the content of a displayed Tk::Zinc window. The size (in pixels) of the generated image is thus limited to the maximal size of a window on your system.
=head1 AUTHORS
Christophe Mertz <mertz at intuilab dot com>
=head1 COPYRIGHT
CENA (C) 2003-2004 IntuiLab 2004
This program is free software; you can redistribute it and/or modify it under the term of the LGPL licence.
=cut
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