package MTools::Comp::MTremor;
#	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
#
##################################################################

# Le composant permet d'ajouter un comportement de tremblement ? un objet cible
#
# Parametres : 
#	* target : objet cible du tremblement
#	* %options : table de hash permettant la configuration initiale des proprietes
# Propriete :
#	* timeout : periode / 2 du tremblement
#	* target : cible
# 	* amplitude_x, amplitude_y : amplitude du deplacement
#	* -visible : visibilite versus activation du comportement

use strict;
use MTools;
#use MTools::MSwitch;
use MTools::MTimer;

use vars qw /@ISA/;

BEGIN 
{
	@ISA = qw /MTools::MObjet/;
}

use Tk;

sub new {
	my ($class, $target, %options) = @_;
	
	$self -> {__timer} = my $timer = new MTools::MTimer (200, 1, \&tremble);
	my $self = new MTools::MObjet ();
#	$self -> {__sw} = new MTools::MSwitch (
#		$parent,
#		tremble => [$timer],
#		fixe => [],
#	);
#	$self -> {__sw} -> mconfigure (state => 'fixe');
	$timer -> mconfigure ( callback => [$self, '__tremble']);
	bless $self, $class;

	$self -> recordProperty ('timeout', 200);
	$self -> recordProperty ('target', $target);
	$self -> recordProperty ('amplitude_x', 2);
	$self -> recordProperty ('amplitude_y', 2);
	$self -> recordProperty ('-visible', 0);
	$self -> plisten ('-visible', sub { 
		my ($src, $key, $val) = @_;
		if ($val == 0)
		{
			$self -> __stop ();
		}
		else
		{
			$self -> __start ();
		}
	});
	
	$self -> mconfigure (%options);
	
	plink ([$self, 'timeout'], [$timer, 'timeout']);
	$self -> {__timer} = $timer;
	$self -> {__x} = 0;
	$self -> {__y} = 0;
	$self -> {__started} = 0;
	return $self;
}

sub __tremble {
	my ($self) = @_;
	my $target = $self -> mget ('target');
	my $dx = -2 * $self -> {__x};
	my $dy = -2 * $self -> {__y};
	$self -> {__x} = -$self -> {__x};
	$self -> {__y} = -$self -> {__y};
	$target -> translate ($dx, $dy);
}

sub __start {
	my ($self) = @_;
	if ($self -> {__started}) {return;}
	$self -> {__started} = 1;
	my $target = $self -> mget ('target');
	my $amplitudex = $self -> mget ('amplitude_x');
	my $amplitudey = $self -> mget ('amplitude_y');
	$self -> {__x} = $amplitudex;
	$self -> {__y} = $amplitudey;
	$target -> translate ($amplitudex, $amplitudey);
#	$self -> {__sw} -> mconfigure ('state' => 'tremble');	
	$self -> {__timer} -> start ();
}

sub __stop {
	my ($self) = @_;
	if (!$self -> {__started}) {return;}
	$self -> {__started} = 0;
	my $target = $self -> mget ('target');
	$target -> translate (-$self -> {__x}, -$self -> {__y});
	$self -> {__x} = 0;
	$self -> {__y} = 0;
	$self -> {__sw} -> mconfigure ('state' => 'fixe');
	$self -> {__timer} -> stop ();
}

1;