How to resolve the algorithm Animation step by step in the Perl programming language

Published on 12 May 2024 09:40 PM
#Perl

How to resolve the algorithm Animation step by step in the Perl programming language

Table of Contents

Problem Statement

Animation is integral to many parts of GUIs, including both the fancy effects when things change used in window managers, and of course games.   The core of any animation system is a scheme for periodically changing the display while still remaining responsive to the user.   This task demonstrates this.

Create a window containing the string "Hello World! " (the trailing space is significant). Make the text appear to be rotating right by periodically removing one letter from the end of the string and attaching it to the front. When the user clicks on the (windowed) text, it should reverse its direction.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Animation step by step in the Perl programming language

Source code in the perl programming language

use Tk;
use Time::HiRes qw(sleep);

my $msg    = 'Hello World! ';
my $first  = '.+';
my $second = '.';

my $mw = Tk::MainWindow->new(-title => 'Animated side-scroller',-bg=>"white");
$mw->geometry ("400x150+0+0");

$mw->optionAdd('*Label.font', 'Courier 24 bold' );

my $scroller = $mw->Label(-text => "$msg")->grid(-row=>0,-column=>0);
$mw->bind('all'=> '<Key-Escape>' => sub {exit;});
$mw->bind("<Button>" => sub { ($second,$first) = ($first,$second) });

$scroller->after(1, \&display );
MainLoop;

sub display {
    while () {
        sleep 0.25;
        $msg =~ s/($first)($second)/$2$1/;
        $scroller->configure(-text=>"$msg");
        $mw->update();
    }
}

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