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#!/usr/bin/perl
# $Id$
# this simple demo has been adapted by C. Mertz <mertz@cena.fr> from the original
# work of JL. Vinot <vinot@cena.fr>
package tkZincLogo; # for avoiding symbol collision between different demos
use vars qw( $VERSION );
($VERSION) = sprintf("%d.%02d", q$Revision$ =~ /(\d+)\.(\d+)/);
use Tk;
use Tk::Zinc;
use strict;
use Tk::Zinc::Logo; # this module implements a class which instances are Zinc logo!
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 tkZinc logo should used openGL for a correct rendering!
You can transform this logo with your mouse:
Drag-Button 1 for moving the logo,
Drag-Button 2 for zooming the logo,
Drag-Button 3 for rotating the logo,
Shift-Drag-Button 1 for modifying the logo transparency,
Shift-Drag-Button 2 for modifying the logo gradient.'
);
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 $group = $zinc->add('group', 1, );
my $logo = Tk::Zinc::Logo->new(-widget => $zinc,
-parent => $group,
-position => [40, 70],
-priority => 800,
-scale => [.6, .6],
);
$zinc->Tk::bind('<ButtonPress-1>', [\&press, \&motion]);
$zinc->Tk::bind('<ButtonRelease-1>', [\&release]);
$zinc->Tk::bind('<ButtonPress-2>', [\&press, \&zoom]);
$zinc->Tk::bind('<ButtonRelease-2>', [\&release]);
$zinc->Tk::bind('<ButtonPress-3>', [\&press, \&rotate]);
$zinc->Tk::bind('<ButtonRelease-3>', [\&release]);
$zinc->Tk::bind('<Shift-ButtonPress-1>', [\&press, \&modifyAlpha]);
$zinc->Tk::bind('<Shift-ButtonRelease-1>', [\&release]);
$zinc->Tk::bind('<Shift-ButtonPress-2>', [\&press, \&modifyGradient]);
$zinc->Tk::bind('<Shift-ButtonRelease-2>', [\&release]);
#
# Controls for the window transform.
#
my ($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;
$zinc->itemconfigure($group, -alpha => $alpha);
}
sub modifyGradient {
my ($zinc) = @_;
my $ev = $zinc->XEvent();
my $ly = $ev->y;
my $yrate = $ly / $zinc->cget(-height);
$yrate = 0 if $yrate < 0;
$yrate = 1 if $yrate > 1;
my $gradientpercent = sprintf ("%d", $yrate * 100);
$zinc->itemconfigure ('zinc_shape', -fillcolor => "=axial 270|#ffffff 0 28|#66848c $gradientpercent|#7192aa");
}
sub motion {
my ($zinc) = @_;
my $ev = $zinc->XEvent();
my $lx = $ev->x;
my $ly = $ev->y;
my @res;
@res = $zinc->transform($group, [$lx, $ly, $cur_x, $cur_y]);
$zinc->translate($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;
$zinc->scale($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);
$zinc->rotate($group, -($langle - $cur_angle));
$cur_angle = $langle;
}
sub release {
my ($zinc) = @_;
$zinc->Tk::bind('<Motion>', '');
}
Tk::MainLoop;
|
