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+package MTools::Comp::MMultiSelection;
+#	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 MMultiSelection associe deux comportements :
+# 	1. Selection multiple d'objets repartis eventuellement dans plusieurs plans. 
+# 	La selection des objets est geree en les entourant et des-entourant.
+# 	Si un objet est selectionne dans le plan 1, les objets situes dans les plans 2, 3, etc. sont negliges. 
+# 	De meme, si un objet est selectionne dans le plan, les objets situes dans les plans 3, 4, etc. sont negliges.
+#	2. Deux interactions peuvent-etre initiees depuis la zone de selection. Si l'interaction est demarree 
+#	au-dessus d'un objet, on deplace les objets selectionnes. Si on demarre un interaction au-dessus du fond,
+#	on demarre une operation de designation de cibles.
+#
+#	Les cibles et les objets selectionnables doivent declarer des proprietes particulieres. Il n'y a ce jour de 
+# 	composant definissant ces interfaces, c'est un tord... Qui est volontaire :)
+#
+#	Les source doivent definir les prorpiete 
+#		barycentre_x
+#		barycentre_y
+# 	La position d'un objet est definie par 
+#		la valeur de barycentre_x plus optionnelement la valeur de la propriete x si celle-ci est definie
+#		la valeur de barycentre_y plus optionnelement la valeur de la propriete y si celle-ci est definie
+#	Les cibles doivent emettre les evenements 
+#		DRAGENTER
+#		DRAGLEAVE
+#		RELEASEDOVER
+#
+#	NOTA : le deuxieme comportement devrait etre dissocie de l'objet multi-selection... 
+#	Cela reste a faire egalement
+#
+# Parametres : 
+#	* src : Objet sur lequel est effectue l'interaction de selection
+#	* dessin : Group parent du dessin de la selection
+#	* reference a la frame principale
+# Proprietes : 
+#	* delay : duree pendant laquelle le dessin de la selection s'estompe et pendant laquelle le demarrage de la
+#	seconde interaction est possible
+#	* inertie : coefficient d'inertie dqns le deplacement de la fleche
+# Evenements :
+#	* PRESSED : Notifie lorsque l'on demarre la selection
+#	* MOVED : Notifie lorsque la selection evolue
+#	* RELEASED : Notifie lorsque la selection est terminee
+#	* FLECHEPRESSED : Notifie lorsque une seconde interaction est demarree depuis la zone de selection
+#	* FLECHEMOVED : Notifie lorsque la seconde interaction evolue
+#	* FLECHERELEASED : Notifie lorsque la seconde interaction se termine
+#	* SELECTION_CHANGED : Notifie lorsque le statut d'un objet a change
+# Fonctions : 
+#	* addObject : $multi -> addObject ($objet, $plan)
+#	Ajoute l'objet $objet dans le plan de selection $plan
+#	* removeObject : $multi -> removeObject ($objet, $plan)
+#	Supprime l'objet $objet du plan de selection $plan
+#	* addDropTarget : $multi -> addDropTarget ($target)
+#	Ajoute la cible $target
+#	* removeDropTarget : $multi -> removeDropTarget ($target)
+#	Supprime la cible $target
+#	* applySelection : $multi -> applySelection ($plan, $fonction, @parametres)
+#	Applique la fonction $fonction (@parametres) ? tous les objets selectionnes dans le plan $plan
+#	* applyAll : $multi -> applyAll ($plan, $fonction, @parametres)
+#	Applique la fonction $fonction (@parametres) ? tous les objets du plan $plan
+#	* getSelectedPlan : $multi -> getSelectedPlan ()
+#	Retourne l'index du plan selectionne
+#	* getSelection : $multi -> getSelection ($plan)
+#	Retourne la liste des objets selectionnes dans le plan $plan si $plan est d?fini 
+#	sinon retourne $multi -> getSelection ($multi -> getSelectedPlan ())
+#	
+
+
+
+use strict;
+use MTools;
+use MTools::MObjet;
+use Math::Trig;
+use MTools::Anim::MOpacity;
+use MTools::Comp::MInertie;
+use MTools::MGroup;
+
+use vars qw /@ISA/;
+
+BEGIN 
+{
+	@ISA = qw /MTools::MObjet/;
+}
+
+use Tk;
+
+sub new {
+	my ($class, $src, $dessin, $frame, %options) = @_;
+	my $self = new MTools::MObjet ();
+	bless $self, $class;
+	
+	$self -> recordProperty ('delay', 0);
+	$self -> recordProperty ('inertie', 0.6);
+	$self -> recordEvent ('PRESSED');
+	$self -> recordEvent ('MOVED');
+	$self -> recordEvent ('RELEASED');
+	$self -> recordEvent ('FLECHEPRESSED');
+	$self -> recordEvent ('FLECHEMOVED');
+	$self -> recordEvent ('FLECHERELEASED');
+	$self -> recordEvent ('SELECTION_CHANGED');
+	$self -> recordEvent ('DESELECT_ALL');
+	$self -> mconfigure (%options);
+	
+	binding ($src, '<Button-1>', [\&__pressed, $self, Ev('x'), Ev('y'), Ev('t')]);
+	binding ($src, '<Button1-Motion>', [\&__moved, $self, Ev('x'), Ev('y'), Ev('t')]);
+	binding ($src, '<ButtonRelease-1>', [\&__released, $self, Ev('x'), Ev('y'), Ev('t')]);
+	
+	$self -> {__inertie} = my $inertie = new MTools::Comp::MInertie(
+		$self,
+		'rate' => $self -> mget ('inertie'),
+	);
+	binding ($inertie, 'INERTIE_STOPPED', [$self, \&__fin_moved]);
+	
+	my $inertie = new MTools::Comp::MInertie(
+		$self,
+		'rate' => 0.75,
+		'msg_pressed' => 'FLECHEPRESSED',
+		'msg_moved' => 'FLECHEMOVED',
+		'msg_released' => 'FLECHERELEASED',
+		'msg_stopped' => 'FLECHEINERTIE_STOPPED',
+		'inertie_callback' => '__translate_fleche',
+	);
+	binding ($inertie, 'FLECHEINERTIE_STOPPED', [$self, \&__fin_fleche_moved]);
+	
+	$self -> {__frame} = $frame;
+	$self -> {__drop_targets} = ();
+	$self -> {__objects} = ();
+	$self -> {__points} = ();
+	$self -> {__owns_data} = ();
+	$self -> {__source} = minstance ($src);
+	
+	$self -> {__gp_anime} = my $group = new MTools::MGroup ($dessin);
+	
+	push (@{$self -> {__owns_data}}, minstance ($src));
+	push (@{$self -> {__owns_data}}, minstance ($group));
+	
+	$self -> {__anim__disparition} = new MTools::Anim::MOpacity (
+		duration => 0.8,
+		targets => $group,
+		from_opacity => 100,
+		to_opacity => 0,
+	);
+	
+	binding ($self -> {__anim__disparition}, 'ANIMATION_END', [$self, \&__clear]);
+
+	$self -> {__curve_bck} = $zinc -> add ('curve', minstance($group), [[0,0],[0,0]],
+		-linecolor => "#888888;50",
+		-linewidth => 2,
+		-smoothrelief => 1,
+		-priority => 10,
+		-visible  => 1,
+		-sensitive => 1,
+		-filled => 0,
+	);
+	$self -> {__curve} = $zinc -> add ('curve', minstance($group), [[0,0],[0,0]],
+		-linecolor => "#FFFFFF;90",
+		-linewidth => 1,
+		-smoothrelief => 1,
+		-priority => 10,
+		-visible  => 1,
+		-sensitive => 1,
+		-fillcolor => "#FFFFFF;10",
+		-filled => 1,
+	);
+	push (@{$self -> {__owns_data}}, minstance ($self -> {__curve}));
+	
+	$self -> {__fleche} = $zinc -> add ('curve', minstance($dessin), [[0,0],[0,0]],
+		-linecolor => "black",
+		-linewidth => 2,
+		-priority => 10,
+		-visible  => 1,
+		-sensitive => 0,
+	);
+	push (@{$self -> {__owns_data}}, minstance ($self -> {__fleche}));
+	
+	$self -> {__ph_fleche} = $zinc -> add ('curve', minstance($dessin), [[0,0],[0,0]],
+		-linecolor => "black",
+		-linewidth => 2,
+		-priority => 10,
+		-visible  => 1,
+		-sensitive => 0,
+	);
+	push (@{$self -> {__owns_data}}, minstance ($self -> {__ph_fleche}));
+	
+	$self -> {__pb_fleche} = $zinc -> add ('curve', minstance($dessin), [[0,0],[0,0]],
+		-linecolor => "black",
+		-linewidth => 2,
+		-priority => 10,
+		-visible  => 1,
+		-sensitive => 0,
+	);
+	push (@{$self -> {__owns_data}}, minstance ($self -> {__pb_fleche}));
+
+	binding ($self -> {__curve}, '<Button-1>', [\&__fleche_pressed, $self, Ev('x'), Ev('y'), Ev('t')]);
+	binding ($self -> {__curve}, '<Button1-Motion>', [\&__fleche_moved, $self, Ev('x'), Ev('y'), Ev('t')]);
+	binding ($self -> {__curve}, '<ButtonRelease-1>', [\&__fleche_released, $self, Ev('x'), Ev('y'), Ev('t')]);
+	$self -> {__fleche_points} = ();
+	$self -> {__fleche_started} = 0;
+	$self -> {__drag_started} = 0;
+	return $self;
+}
+
+sub __hide_cursor {
+	my ($self) = @_;
+	my $frame = $self -> {__frame};
+	$frame -> {window} -> Tk::configure (
+		-cursor => [ '@'.Tk::findINC('emptycursor.xbm'),
+			Tk::findINC('emptycursor.mask'),
+			'black', 'black'
+		]
+	);
+}
+
+sub __show_cursor {
+	my ($self) = @_;
+	my $frame = $self -> {__frame};
+	$frame -> {window} -> Tk::configure (
+		-cursor => "",
+	);
+}
+
+sub addObject {
+	my ($self, $object, $plan) = @_;
+	if (!defined $plan) {$plan = 0;}
+	if (!$object -> propertyExists ('barycentre_x'))
+	{
+		print "MMultiSelection Error property barycentre_x isn't defined in $object\n";
+		return;
+	}
+	if (!$object -> propertyExists ('barycentre_y'))
+	{
+		print "MMultiSelection Error property barycentre_y isn't defined in $object\n";
+		return;
+	}
+	$object -> {__surround_angle} = 0;
+	push (@{$self -> {__objects} [$plan]}, $object);
+}
+
+sub removeObject {
+	my ($self, $target, $plan) = @_;
+	if (!defined $plan) {$plan = 0;}
+	for (my $i = @{$self -> {__objects} [$plan]} - 1; $i >= 0; $i --) 
+	{
+		if (@{$self -> {__objects} [$plan]} [$i] eq $target) 
+		{
+			splice (@{$self -> {__objects} [$plan]}, $i, 1);
+			last;
+		}
+	}
+}
+
+sub addDropTarget {
+	my ($self, $target) = @_;
+	push (@{$self -> {__drop_targets}}, $target);
+}
+
+sub removeDropTarget {
+	my ($self, $target) = @_;
+	if ($self -> {__last_notified} == $target)
+	{
+		$self -> {__last_notified} = undef;
+	}
+	for (my $i = @{$self -> {__drop_targets}} - 1; $i >= 0; $i--) 
+	{
+		if (@{$self -> {__drop_targets}} [$i] eq $target) 
+		{
+			splice (@{$self -> {__drop_targets}}, $i, 1);
+			last;
+		}
+	}
+}
+
+sub __clear {
+	my ($self) = @_;
+	$self -> {__anim__disparition} -> stop ();
+	$self -> {__inertie} -> interrupt ();
+	$self -> {__fleche_started} = 0;
+	$self -> {__drag_started} = 0;
+	$self -> {__points} = ();
+	$self -> {__fleche_points} = ();
+	$self -> __reset_surrounding ();
+	$zinc -> coords ($self -> {__ph_fleche}, 0, [[0,0],[0,0]]);
+	$zinc -> coords ($self -> {__pb_fleche}, 0, [[0,0],[0,0]]);
+	$zinc -> coords ($self -> {__fleche}, 0, [[0,0],[0,0]]);
+	$zinc -> coords ($self -> {__curve}, 0, [[0,0],[0,0]]);
+	$zinc -> coords ($self -> {__curve_bck}, 0, [[0,0],[0,0]]);
+	$self -> {__gp_anime} -> mconfigure (
+		-alpha => 100,
+	);
+}
+
+sub __pressed {
+	my ($self, $x, $y, $t) = @_;
+	$self -> __clear ();
+	push (@{$self -> {__points}}, [$x, $y]);
+	$self -> notify ('PRESSED', $x, $y, $t);
+	$self -> notify ('DESELECT_ALL');
+}
+
+sub __released {
+	my ($self, $x, $y, $t) = @_;
+	my $pt = $self -> {__points}[@{$self -> {__points}} - 2];
+	$self -> notify ('RELEASED',  $x - $pt -> [0], $y - $pt -> [1], $t);
+}
+
+sub __fin_moved {
+	my ($self) = @_;
+	if (!$self -> {__fleche_started} && !$self -> {__drag_started})
+	{
+		$self -> {__anim__disparition} -> start ();
+	}
+}
+
+sub __moved {
+	my ($self, $x, $y, $t) = @_;
+	push (@{$self -> {__points}}, [$x, $y]);
+	my @pts = @{$self -> {__points}};
+	$zinc -> coords ($self -> {__curve}, 0, \@pts);
+	$zinc -> coords ($self -> {__curve_bck}, 0, \@pts);
+	my $pt = $self -> {__points}[@{$self -> {__points}} - 2];
+	$self -> notify ('MOVED', $x - $pt -> [0], $y - $pt -> [1], $t);
+	$self -> __update_all ();
+}
+
+sub translate {
+	my ($self, $dx, $dy) = @_;
+	my $pt = $self -> {__points}[@{$self -> {__points}} - 1];
+	push (@{$self -> {__points}}, [$pt -> [0] - $dx, $pt -> [1] - $dy]);
+	my @pts = @{$self -> {__points}};
+	$zinc -> coords ($self -> {__curve}, 0, \@pts);
+	$zinc -> coords ($self -> {__curve_bck}, 0, \@pts);
+	$self -> __update_all ();
+}
+
+sub __fleche_pressed {
+	my ($self, $x, $y, $t) = @_;
+	my @all = $zinc -> find ('overlapping', $x, $y, $x + 1, $y +1);
+	if ($all [1] == $self -> {__source})
+	{
+		$self -> {__fleche_points} = ();
+		push (@{$self -> {__fleche_points}}, [$x, $y]);
+		$self -> {__fleche_started} = 1;
+		$self -> __hide_cursor ();
+		$self -> notify ('FLECHEPRESSED', $x, $y, $t);
+		$self -> __stop_animation ();
+	}
+	else
+	{
+		$self -> {__drag_started} = 1;
+		$self -> {__lx} = $x;
+		$self -> {__ly} = $y;
+		$self -> notify ('FLECHEPRESSED', $x, $y, $t);
+	}
+}
+
+sub __stop_animation {
+	my ($self) = @_;
+	$self -> {__anim__disparition} -> stop ();
+	$self -> {__gp_anime} -> mconfigure (
+		-alpha => 100,
+	);
+}
+
+sub __fleche_released {
+	my ($self, $x, $y, $t) = @_;
+	if ($self -> {__fleche_started}) 
+	{
+		my $pt = $self -> {__fleche_points}[@{$self -> {__fleche_points}} - 1];
+		$self -> notify ('FLECHERELEASED', $x - $pt -> [0], $y - $pt -> [1], $t);
+	}
+	else
+	{
+		$self -> notify ('FLECHERELEASED', $x - $self -> {__lx}, $y - $self -> {__ly}, $t);
+		$self -> {__lx} = $x;
+		$self -> {__ly} = $y;
+	}
+
+}
+
+sub __fin_fleche_moved {
+	my ($self) = @_;
+	if ($self -> {__fleche_started}) 
+	{
+		$self -> __clear ();
+		if (defined $self -> {__last_notified})
+		{
+			$self -> {__last_notified} -> notify ('RELEASEDOVER', $self);
+			$self -> {__last_notified} = undef;
+		}
+		elsif (defined $self -> {__secondary_last_notified})
+		{
+			$self -> {__secondary_last_notified} -> notify ('RELEASEDOVER', $self);
+			$self -> {__secondary_last_notified} = undef;
+		}
+		$self -> __show_cursor ();
+	}
+	else
+	{
+	}
+}
+
+sub __fleche_moved {
+	my ($self, $x, $y, $t) = @_;
+	if ($self -> {__fleche_started}) 
+	{
+		push (@{$self -> {__fleche_points}}, [$x, $y]);
+		my @pts = @{$self -> {__fleche_points}};
+		$zinc -> coords ($self -> {__fleche}, 0, \@pts);
+		my $pt = $self -> {__fleche_points}[@{$self -> {__fleche_points}} - 2];
+		$self -> notify ('FLECHEMOVED', $x - $pt -> [0], $y - $pt -> [1], $t);
+		$self -> __update_fleche_moved ($x, $y);
+	}
+	else
+	{
+		$self -> notify ('FLECHEMOVED', $x - $self -> {__lx}, $y - $self -> {__ly}, $t);
+		$self -> __translate_selection ($x - $self -> {__lx}, $y - $self -> {__ly});
+		$self -> {__lx} = $x;
+		$self -> {__ly} = $y;
+	}
+}
+
+sub __translate_fleche {
+	my ($self, $dx, $dy) = @_;
+	if ($self -> {__fleche_started}) 
+	{
+		my $pt = $self -> {__fleche_points}[@{$self -> {__fleche_points}} - 1];
+		push (@{$self -> {__fleche_points}}, [$pt -> [0] - $dx, $pt -> [1] - $dy]);
+		my @pts = @{$self -> {__fleche_points}};
+		$zinc -> coords ($self -> {__fleche}, 0, \@pts);
+		$self -> __update_fleche_moved ($pt -> [0] - $dx, $pt -> [1] - $dy);
+	}
+	else
+	{
+		$self -> __translate_selection (-$dx, -$dy);
+	}
+}
+
+sub __translate_selection {
+	my ($self, $dx, $dy) = @_;
+	my @oldy = $self -> applySelection (0, 'mget', 'y');
+	my @oldx = $self -> applySelection (0, 'mget', 'x');
+	my @selection = $self -> getSelection ();
+	for (my $i = 0; $i < @selection; $i ++)
+	{
+		my $x = $selection [$i] -> mget ('x');
+		my $pdx = $dx - ($x - $oldx [$i]);
+		my $y = $selection [$i] -> mget ('y');
+		my $pdy = $dy - ($y - $oldy [$i]);
+		$selection [$i] -> translate ($pdx, $pdy);
+	}
+}
+	
+sub __update_fleche_moved {
+	my ($self, $x, $y) = @_;
+	my $pt;
+	if (@{$self -> {__fleche_points}} > 2)
+	{
+		$pt = $self -> {__fleche_points}[@{$self -> {__fleche_points}} - 3];
+	}
+	else
+	{
+		$pt = $self -> {__fleche_points}[@{$self -> {__fleche_points}} - 2];
+	}
+	my $xa = $x - $pt -> [0];
+	my $ya = $y - $pt -> [1];
+	if ($xa + $ya == 0) {return;}
+
+	my $norme = sqrt ($xa * $xa + $ya * $ya);
+	$xa = $xa * 8 / $norme;
+	$ya = $ya * 8 / $norme;
+
+	if ( $xa != 0)
+	{
+		my $yb = sqrt ((10 * 10 - $xa * $xa - $ya * $ya) / (1 + $ya * $ya / ($xa * $xa)));
+		my $xb = -$yb * $ya / $xa;
+		$zinc -> coords ($self -> {__ph_fleche}, 0, [[$x, $y], [$x + $xb - $xa, $y + $yb - $ya]]);
+		$zinc -> coords ($self -> {__pb_fleche}, 0, [[$x, $y], [$x - $xb - $xa, $y - $yb - $ya]]);
+	}
+	else
+	{
+		my $xb = sqrt (10 * 10 - $ya * $ya);
+		my $yb = 0;
+		$zinc -> coords ($self -> {__ph_fleche}, 0, [[$x, $y], [$x + $xb - $xa, $y + $yb - $ya]]);
+		$zinc -> coords ($self -> {__pb_fleche}, 0, [[$x, $y], [$x - $xb - $xa, $y - $yb - $ya]]);
+	}
+	my @all = $zinc -> find ('overlapping', $x, $y, $x + 1, $y +1);
+	
+	if (defined $self -> {__drop_targets})
+	{
+		my @selected;
+		my @owns = @{$self -> {__owns_data}};
+		for (my $i = 0; $i < @all; $i++)
+		{
+			my $find = 0;
+			for (my $j = 0; $j < @owns; $j ++)
+			{
+				if ($all [$i] == $owns [$j])
+				{
+					$find = 1;
+				}
+			}
+			if (!$find)
+			{
+				push (@selected, $all [$i]);
+			}
+		}
+		if (defined @selected)
+		{
+			my @targets = @{$self -> {__drop_targets}};
+			my $last_notified = $self -> {__last_notified};
+			$self -> {__last_notified} = undef;
+			for (my $i = 0; $i < @targets; $i ++)
+			{
+				if (minstance ($targets [$i]) == $selected [0] || minstance ($targets [$i]) == $selected [1])
+				{
+					if ($last_notified != $targets [$i])
+					{
+						$targets [$i] -> notify ('DRAGENTER');
+					}
+					$self -> {__last_notified} = $targets [$i];
+				}
+				else
+				{
+					if ($last_notified == $targets [$i])
+					{
+						$targets [$i] -> notify ('DRAGLEAVE');
+					}
+				}
+			}
+		}
+	}
+}
+
+sub getObjectBellow {
+	my ($self, $x, $y, @objects) = @_;
+	my @all = $zinc -> find ('overlapping', $x, $y, $x + 1, $y +1);
+	my @owns = @{$self -> {__owns_data}};
+	my @below;
+	for (my $i = 0; $i < @all; $i++)
+	{
+		my $find = 0;
+		for (my $j = 0; $j < @owns; $j ++)
+		{
+			if ($all [$i] == $owns [$j])
+			{
+				$find = 1;
+			}
+		}
+		if (!$find)
+		{
+			push (@below, $all [$i]);
+		}
+	}
+	my $nb = @below;
+	my @elements;
+	for (my $i = 0; $i < $nb; $i ++)
+	{
+		my @fils = $zinc -> find ('ancestors', $below [$i]);
+		push (@elements, '-'.$below [$i], @fils);
+	}
+	my $main;
+	for (my $j = 0; $j < @elements; $j ++)
+	{
+		if (index($elements [$j], '-') == 0)
+		{
+			$elements [$j] = substr ($elements [$j], 1, length ($elements [$j]));
+			$main = $elements [$j];
+		}
+		for (my $i = 0; $i < @objects; $i++)
+		{
+			if (minstance ($objects [$i]) == $elements [$j])
+			{
+				return ($objects [$i], $main);
+			}
+		}
+	}
+	return undef;
+}
+
+sub __update_all {
+	my ($self) = @_;
+	my $selection_changed = 0;
+  	$self -> {_selected} = 0;
+	$self -> {__selected_plan} = -1;
+	if (defined $self -> {__objects})
+	{
+		my @object_plan = @{$self -> {__objects}};
+		for (my $j = 0; $j < @object_plan; $j ++)
+		{
+			if (defined $self -> {__objects} [$j])
+			{
+				my @items = @{$self -> {__objects} [$j]};
+				for (my $i = 0; $i < @items; $i++)
+				{
+					$selection_changed = $selection_changed || $self -> __update_surrouding ($items [$i], ($self -> {__selected_plan} != -1), $self -> {__points});
+				}
+				if ($self -> {_selected} && $self -> {__selected_plan} == -1)
+				{
+					$self -> {__selected_plan} = $j;
+				}
+			}
+		}
+	}
+	if ($selection_changed)
+	{
+		$self -> notify ('SELECTION_CHANGED', $self)
+	}
+}
+
+sub getSelectedPlan {
+	my ($self) = @_;
+	return $self -> {__selected_plan};
+}
+
+sub __update_surrouding {
+	my ($self, $item, $force_non_sel, $coords) = @_;
+	my $center_x = $item -> mget ('barycentre_x');
+	if ($item -> propertyExists ('x'))
+	{
+		$center_x += $item -> mget ('x');
+	}
+	my $center_y = $item -> mget ('barycentre_y');
+	if ($item -> propertyExists ('y'))
+	{
+		$center_y += $item -> mget ('y');
+	}
+	my ($tmp,$ref);
+	$ref = -$self -> __angle($coords, @{$coords} - 1, $center_x, $center_y, 0);
+	$tmp = -$self -> __angle($coords, @{$coords} - 2, $center_x, $center_y, $ref);
+	$item -> {__surround_angle} += $tmp;
+	$tmp = $self -> __angle($coords, 0, $center_x, $center_y, $ref);
+	if ($force_non_sel)
+	{
+		if ($item -> isSelected ())
+		{
+	    	$item -> setSelected (0);
+		}
+	}
+	else
+	{
+		if (abs ($item -> {__surround_angle} + $tmp) > 2) 
+		{
+			$self -> {_selected} ++;
+			if (!$item -> isSelected ())
+			{
+	  			$item -> setSelected (1);
+	  			return 1;
+			}
+		} 
+		else 
+		{
+			if ($item -> isSelected ())
+			{
+		    	$item -> setSelected (0);
+		    	return 1;
+			}
+		}
+	}
+	return 0;
+}
+
+sub __angle {
+	my ($self, $coords, $index, $center_x, $center_y, $ref) = @_;
+	my $angle;
+	my $tab = $coords -> [$index];
+	$angle = atan2 ($tab -> [1] - $center_y, $tab -> [0] - $center_x) + $ref;
+	$angle -= 2*pi if ($angle > pi);
+	$angle += 2*pi if ($angle < - pi);
+	return $angle;
+}
+
+sub __reset_surrounding {
+	my ($self) = @_;
+	if (defined $self -> {__objects})
+	{
+		my @object_plan = @{$self -> {__objects}};
+		for (my $j = 0; $j < @object_plan; $j ++)
+		{
+			if (defined $self -> {__objects} [$j])
+			{
+				my @items = @{$self -> {__objects} [$j]};
+				for (my $i = 0; $i < @items; $i++)
+				{
+					$items [$i] -> {__surround_angle} = 0;
+				}
+			}
+		}
+	}
+}
+
+sub applySelection {
+	my ($self, $plan, $fct, @args) = @_;
+	my @retour;
+	if (defined $self -> {__objects} [$plan])
+	{
+		my @items = @{$self -> {__objects} [$plan]};
+		for (my $i = 0; $i < @items; $i++)
+		{
+			if ($items [$i] -> isSelected ())
+			{
+				push (@retour, $items [$i] -> $fct (@args));
+			}
+		}
+	}
+	return @retour;
+}
+
+sub applyAll {
+	my ($self, $plan, $fct, @args) = @_;
+	my @retour;
+	if (defined $self -> {__objects} [$plan])
+	{
+		my @items = @{$self -> {__objects} [$plan]};
+		for (my $i = 0; $i < @items; $i++)
+		{
+			push (@retour, $items [$i] -> $fct (@args));
+		}
+	}
+	return @retour;
+}
+
+sub getSelection {
+	my ($self, $plan) = @_;
+	if (!defined $plan) {$plan = $self -> getSelectedPlan ();}
+	my @selection;
+	if (defined $self -> {__objects} [$plan])
+	{
+		my @items = @{$self -> {__objects} [$plan]};
+		for (my $i = 0; $i < @items; $i++)
+		{
+			if ($items [$i] -> isSelected ())
+			{
+				push (@selection, $items [$i]);
+			}
+		}
+	}
+	return @selection;
+}
+
+1;