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package SVGExtension;
# 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
#
##################################################################
# Zinc methods, usefull at display time of Zinc code generated for SVG file
#
# Copyright 2003
# Centre d'Études de la Navigation Aérienne
#
# Author: Christophe Mertz <mertz@cena.fr>
#
# $Id: SVGExtension.pm,v 1.1.1.1 2006-10-20 13:34:25 merlin Exp $
#############################################################################
use strict;
use Carp;
use vars qw( $VERSION );
($VERSION) = sprintf("%d.%02d", q$Revision: 1.1.1.1 $ =~ /(\d+)\.(\d+)/);
# To implement SVG viewport.
# This method must be called when dispalying zinc objects, because the bbox of
# Zinc objects must be known.
## BUG: Zinc method bbox return an oversized bbox (Zinc 3.2.6h).
## So this method cannot currently be fully exact.
sub Tk::Zinc::adaptViewport {
my ($zinc, $name, $width,$height, $viewbox, $aspectRatio) = @_;
my($x0,$y0,$x1,$y1)=$zinc->bbox($name);
($x0,$y0,$x1,$y1)=($x0+2,$y0+2,$x1-2,$y1-2); # 2 is a delta induced by zinc!
my $dx=$x1-$x0;
my $dy=$y1-$y0;
# print "In adaptViewport: $name w=$width h=$height dx=$dx dy=$dy x0=$x0,y0=$y0,x1=$x1,y1=$y1\n";
if (!$aspectRatio) {
## simple scale should be enough!
my ($scaleX,$scaleY) = ($width/$dx, $height/$dy);
$zinc->scale($name, $scaleX,$scaleY);
} else {
my ($minx,$miny,$portWidth,$portHeight) = split /[\s,]+/ , $viewbox;
my ($xalign,$yalign,$meet) = $aspectRatio =~ /x(.*)Y(.*)\s+(.*)/ ;
print "In adaptViewport: $name viewbox=$viewbox xalign=$xalign yalign=$yalign meet=$meet\n";
if ($meet eq 'meet') {
## il faut réduire la taille
my $scale = 1;
my ($scaleX,$scaleY) = ($width/$dx, $height/$dy);
if ($scaleX < $scaleY) {
if ($scaleX < 1) {
$scale = $scaleX;
}
} elsif ($scaleY < 1) {
$scale = $scaleY;
}
print "In adaptViewport: meet scale=$scale\n";
$zinc->scale($name, $scale,$scale);
my ($shiftX,$shiftY)=(0,0);
if ($xalign eq 'Min') {
} elsif ($xalign eq 'Max') {
$shiftX = $width - $dx*$scale;
} elsif ($xalign eq 'Mid') {
$shiftX = ($width - $dx*$scale)/2;
} else {
print "ERROR bad aspectratio value (for X): $aspectRatio\n";
}
if ($yalign eq 'Min') {
} elsif ($yalign eq 'Max') {
$shiftY = $height - $dy*$scale;
} elsif ($yalign eq 'Mid') {
$shiftY = ($height - $dy*$scale)/2;
} else {
print "ERROR: bad aspectratio value (for Y): $aspectRatio \n";
}
$zinc->translate($name, $shiftX,$shiftY);
} elsif ($meet eq 'slice') {
## il faut clipper
my $scale = 1;
if ($dx < $width) {
$scale = $width/$dx;
}
if ($dy < $height) {
my $scaleY = $height/$dy;
if ($scaleY > $scale) {$scale=$scaleY};
}
print "In adaptViewport: slice scale=$scale\n";
$zinc->scale($name, $scale,$scale);
my ($shiftX,$shiftY)=(0,0);
if ($xalign eq 'Min') {
} elsif ($xalign eq 'Max') {
$shiftX = $width - $dx*$scale;
} elsif ($xalign eq 'Mid') {
$shiftX = ($width - $dx*$scale)/2;
} else {
print "ERROR bad aspectratio value (for X): $aspectRatio\n";
}
if ($yalign eq 'Min') {
} elsif ($yalign eq 'Max') {
$shiftY = $height - $dy*$scale;
} elsif ($yalign eq 'Mid') {
$shiftY = ($height - $dy*$scale)/2;
} else {
print "ERROR: bad aspectratio value (for Y): $aspectRatio \n";
}
$zinc->translate($name, $shiftX,$shiftY);
my $g=$zinc->group($name);
my ($tag)= $zinc->gettags($name); # there should only be one!
$zinc->add('group', $g, -tags => [ "sub$tag" ]);
$zinc->chggroup($name, "sub$tag");
print "clipping with [0,0, $width,$height]\n";
$zinc->add('rectangle', "sub$tag", [0,0, $width+1,$height+1],
-tags => ["clipper_sub$tag"]);
$zinc->itemconfigure("sub$tag", -clip => "clipper_sub$tag");
}
print "\n";
}
}
###################################################################
1;
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