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package MTools::Comp::MAntiRecouvrement;
# 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
#
##################################################################
# Encapsule l'algorithme d'anti-recouvrement des objets et gere les objets anti-recouvres
# IMPORTANT : Les objets anti-recouvre doivent heriter de MTools::Comp::MAntiRecouvrementItem
#
# BUG : La propriete '-visible' devrait permettre d'activer ou non l'anti-recouvrement global des objets.
# Ce n'est pas le cas aujourd'hui, cette popriete est inactive
#
# Fonctions :
# * addObject : permet d'inclure un objet heritant de MTools::Comp::MAntiRecouvrementItem dans l'algorithme d'anti-recouvrement
# * removeObjet : permet de sortir un objet de l'algorithme d'anti-recouvrement
use strict;
use MTools;
use MTools::MObjet;
use vars qw /@ISA/;
BEGIN
{
@ISA = qw /MTools::MObjet/;
}
use Tk;
sub new {
my ($class) = @_;
my $self = new MTools::MObjet ();
bless $self, $class;
$self -> recordProperty ('-visible', 1);
$self -> recordEvent ('ITEM_MOVED');
$self -> {__objects} = ();
$self -> plisten ('-visible', sub {
my ($src, $key, $val, $old) = @_;
if (defined $self -> {__objects})
{
for (my $i = @{$self -> {__objects}} - 1; $i >= 0; $i --)
{
@{$self -> {__objects}} [$i] -> {__added} = $val;
}
}
});
$self -> {__known_objects} = ();
$self -> {__ask_move} = ();
$self -> {__ask_reaction} = ();
return $self;
}
sub addObject {
my ($self, $ob) = @_;
my $ever_known = 0;
if (defined $self -> {__known_objects})
{
my @known = @{$self -> {__known_objects}};
for (my $i = 0; $i < @known; $i ++)
{
if ($known [$i] eq $ob)
{
$ever_known = 1;
last;
}
}
}
if (!$ever_known)
{
binding ($ob, '__HANDLE_MOVING', [$self, \&__on_handle_moving_on_track]);
binding ($ob, '__PUSH_BACK', [$self, \&__on_push_back_on_track]);
binding ($ob, '__ENQUEUE_MOVING', [$self, \&__on_enqueue_moving_on_track]);
push (@{$self -> {__known_objects}}, $ob);
}
if (!defined $ob -> {__added} || $ob -> {__added} == 0)
{
push (@{$self -> {__objects}}, $ob);
}
$ob -> update_bbox ();
$ob -> {__added} = $self -> mget ('-visible');
$ob -> translate (0, 0);
}
sub removeObject {
my ($self, $target) = @_;
for (my $i = @{$self -> {__objects}} - 1; $i >= 0; $i --)
{
if (@{$self -> {__objects}} [$i] eq $target)
{
@{$self -> {__objects}} [$i] -> {__added} = 0;
splice (@{$self -> {__objects}}, $i, 1);
}
}
}
sub __on_handle_moving_on_track {
my ($self) = @_;
my ($first_work, $first_track, $current_track, $intersection);
while (scalar @{$self -> {__ask_move}} > 0)
{
$first_work = $self -> {__ask_move} -> [0];
$first_track = $first_work -> [0];
my ($firstx, $firsty) = ($first_track -> mget ('x'), $first_track -> mget ('y'));
for (my $i = 0; $i < @{$self -> {__objects}}; $i++)
{
$current_track = @{$self -> {__objects}} [$i];
next if ($current_track eq $first_track);
my ($x, $y) = ($current_track -> mget ('x'), $current_track -> mget ('y'));
$intersection = __intersection (
$firstx, $firsty,
$first_track -> mget ('width'), $first_track -> mget ('height'),
$x, $y,
$current_track -> mget ('width'), $current_track-> mget ('height')
);
next if (($intersection -> [2] == 0) and ($intersection -> [3] == 0));
if ($intersection -> [2] < $intersection -> [3])
{
if ($firstx < $x)
{
$current_track -> __try_move ($intersection -> [2], 0, $first_work -> [3]);
}
else
{
$current_track -> __try_move(-$intersection -> [2], 0, $first_work -> [3]);
}
}
else
{
if ($firsty < $y)
{
$current_track -> __try_move (0, $intersection -> [3], $first_work -> [3]);
}
else
{
$current_track -> __try_move (0, -$intersection -> [3], $first_work -> [3]);
}
}
}
shift @{$self -> {__ask_move}};
}
$self -> notify ('ITEM_MOVED');
}
sub __on_push_back_on_track {
my ($self, $track, $delta_x, $delta_y, $path) = @_;
push @{$path}, $track;
my @other_path = @{$path};
$self -> __on_enqueue_moving_on_track ($track, $delta_x, $delta_y, [@other_path]);
$track -> __update_xy ($delta_x, $delta_y);
my ($current_track, $push_x, $push_y, $intersection);
my ($firstx, $firsty) = ($track -> mget ('x'), $track -> mget ('y'));
for (my $i = 0; $i < @{$self -> {__objects}}; $i++)
{
$current_track = @{$self -> {__objects}} [$i];
next if $current_track eq $track;
my ($x, $y) = ($current_track -> mget ('x'), $current_track -> mget ('y'));
$intersection = __intersection (
$firstx, $firsty,
$track -> mget ('width'), $track -> mget ('height'),
$x, $y,
$current_track -> mget ('width'), $current_track -> mget ('height')
);
$push_x = 0;
$push_y = 0;
$push_x = $intersection -> [2] if ($intersection -> [2] <= $delta_x);
$push_x = -$intersection -> [2] if ($intersection -> [2] <= -$delta_x);
$push_y = $intersection -> [3] if ($intersection -> [3] <= $delta_y);
$push_y = -$intersection -> [3] if ($intersection -> [3] <= -$delta_y);
$self -> __on_push_back_on_track ($current_track, $push_x, $push_y, $path)
if ((($push_x != 0) or ($push_y != 0)) and (__occurences ($current_track, @{$path}) < 3));
}
pop @{$path};
}
sub __intersection {
my ($x1, $y1, $w1, $h1, $x2, $y2, $w2, $h2) = @_;
my ($x, $y, $w, $h);
$x = &__max_of ($x1, $x2);
$w = &__min_of ($x1 + $w1, $x2 + $w2) - $x;
if ($w > 0)
{
$y = &__max_of ($y1, $y2);
$h = &__min_of ($y1 + $h1, $y2 + $h2) - $y;
if ($h > 0)
{
return [$x, $y, $w, $h];
}
}
return [0, 0, 0, 0];
}
sub __min_of {
my (@values) = @_;
my $res = $values [0];
foreach (@values)
{
$res = $_ if ($_ <= $res);
}
return $res;
}
sub __max_of {
my (@values) = @_;
my $res = $values [0];
foreach (@values)
{
$res = $_ if ($_ >= $res);
}
return $res;
}
sub __occurences {
my ($val,@tab) = @_;
my $result = 0;
if (($#tab != -1) and (defined $val))
{
foreach (@tab)
{
if (($_ eq $val) or ($_ =~ m/$val/))
{
$result++;
}
}
}
return $result;
}
sub __on_enqueue_moving_on_track {
my ($self, $track, $delta_x, $delta_y, $path) = @_;
push @{$self -> {__ask_move}}, [$track, $delta_x, $delta_y, $path];
}
1;
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