package MTools::Transform::MRotation;
#	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
#
##################################################################

use strict;
use MTools;
use MTools::MObjet;

use vars qw /@ISA/;

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

use Tk;

sub new {
	my ($class, $target, $angle, $x, $y) = @_;
	my $self = new MTools::MObjet ();
	bless $self, $class;
	
	if (!defined $x) {$x = 0;}
	if (!defined $y) {$y = 0;}
	if (!defined $angle) {$angle = 0;}

	$self -> recordProperty ('-visible', 0);
	$self -> recordProperty ('target', $target);
	$self -> recordProperty ('angle', $angle);
	$self -> recordProperty ('x', $x);
	$self -> recordProperty ('y', $y);
	$self -> plisten ('-visible', sub { 
		my ($src, $key, $val) = @_;
		if ($val == 0)
		{
			$self -> __rotate (0);
		}
		else
		{
			$self -> __rotate ($self -> mget ('angle'));
		}
	});
	$self -> plisten ('angle', sub { 
		my ($src, $key, $val) = @_;
		$self -> __rotate ($val);
	});
	$self -> {__current_angle} = 0;
	$self -> __rotate ($angle);
	return $self;
}

sub __rotate {
	my ($self, $angle) = @_;
	my $new_angle = $angle - $self -> {__current_angle};
	$self -> {__current_angle} = $angle;
	my $target = $self -> mget ('target');
	my $x = $self -> mget ('x');
	my $y = $self -> mget ('y');
	$target -> rotate ($new_angle, 1, $x, $y);	
}

1;