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#!/usr/bin/perl
# $Id: icon_zoom_resize.pl 1420 2004-04-30 11:35:18Z lecoanet $
# this simple demo has been developped by C. Mertz <mertz@cena.fr>
package icon_zoom__resize; # for avoiding symbol re-use between different demos
use vars qw( $VERSION );
($VERSION) = sprintf("%d.%02d", q$Revision: 1420 $ =~ /(\d+)\.(\d+)/);
use Tk;
use Tk::Zinc;
use strict;
my $defaultfont = '-adobe-helvetica-bold-r-normal--*-140-*-*-*-*-*-*';
my $mw = MainWindow->new();
my $text = $mw->Scrolled(qw/Text -relief sunken -borderwidth 2 -setgrid true
-height 7 -scrollbars ''/);
$text->pack(qw/-expand yes -fill both/);
$text->insert('0.0',
'This demo needs openGL for rescaling/rotating the icon
You can transform this earth gif image with your mouse:
Drag-Button 1 for zooming the earth,
Drag-Button 2 for rotating the earth,
Drag-Button 3 for moving the earth,
Shift-Drag-Button 1 for modifying the earth transparency'
);
my $zinc = $mw->Zinc(-width => 350, -height => 250,
-render => 1,
-font => "10x20", # usually fonts are sets in resources
# but for this example it is set in the code!
-borderwidth => 3, -relief => 'sunken',
)->pack;
my $earth_group = $zinc->add('group', 1, );
# the following image is included in Perl/Tk distrib
my $image = $zinc->Photo('earth.gif', -file => Tk->findINC('demos/images/earth.gif'));
my $earth = $zinc->add('icon', $earth_group,
-image => $image,
-composescale => 1,
-composerotation => 1,
);
$zinc->add('text', $earth_group,
-position => [30,30],
# -connecteditem => $earth,
-text => "try to zoom/resize the earth!\nWorks even without openGL!!",
-color => "white",
-composescale => 1,
-composerotation => 1,
);
$zinc->Tk::bind('<ButtonPress-1>', [\&press, \&zoom]);
$zinc->Tk::bind('<ButtonRelease-1>', [\&release]);
$zinc->Tk::bind('<ButtonPress-2>', [\&press, \&rotate]);
$zinc->Tk::bind('<ButtonRelease-2>', [\&release]);
$zinc->Tk::bind('<ButtonPress-3>', [\&press, \&motion]);
$zinc->Tk::bind('<ButtonRelease-3>', [\&release]);
$zinc->Tk::bind('<Shift-ButtonPress-1>', [\&press, \&modifyAlpha]);
$zinc->Tk::bind('<Shift-ButtonRelease-1>', [\&release]);
#
# Controls for the window transform.
#
my ($cur_x, $cur_y, $cur_angle);
sub press {
my ($zinc, $action) = @_;
my $ev = $zinc->XEvent();
$cur_x = $ev->x;
$cur_y = $ev->y;
$cur_angle = atan2($cur_y, $cur_x);
$zinc->Tk::bind('<Motion>', [$action]);
}
sub modifyAlpha {
my ($zinc) = @_;
my $ev = $zinc->XEvent();
my $lx = $ev->x;
my $xrate = $lx / $zinc->cget(-width);
$xrate = 0 if $xrate < 0;
$xrate = 1 if $xrate > 1;
my $alpha = $xrate * 100;
$zinc->itemconfigure($earth_group, -alpha => $alpha);
}
sub motion {
my ($zinc) = @_;
my $ev = $zinc->XEvent();
my $lx = $ev->x;
my $ly = $ev->y;
my @res;
@res = $zinc->transform($earth_group, [$lx, $ly, $cur_x, $cur_y]);
$zinc->translate($earth_group, $res[0] - $res[2], $res[1] - $res[3]);
$cur_x = $lx;
$cur_y = $ly;
}
sub zoom {
my ($zinc, $self) = @_;
my $ev = $zinc->XEvent();
my $lx = $ev->x;
my $ly = $ev->y;
my $maxx;
my $maxy;
my $sx;
my $sy;
if ($lx > $cur_x) {
$maxx = $lx;
} else {
$maxx = $cur_x;
}
if ($ly > $cur_y) {
$maxy = $ly
} else {
$maxy = $cur_y;
}
return if ($maxx == 0 || $maxy == 0);
$sx = 1.0 + ($lx - $cur_x)/$maxx;
$sy = 1.0 + ($ly - $cur_y)/$maxy;
$cur_x = $lx;
$cur_y = $ly;
$zinc->scale($earth_group, $sx, $sy);
}
sub rotate {
my ($zinc) = @_;
my $ev = $zinc->XEvent();
my $lx = $ev->x;
my $ly = $ev->y;
my $langle;
$langle = atan2($ly, $lx);
$zinc->rotate($earth_group, -($langle - $cur_angle));
$cur_angle = $langle;
}
sub release {
my ($zinc) = @_;
$zinc->Tk::bind('<Motion>', '');
}
Tk::MainLoop;
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