#!/usr/bin/perl -w
# Research For Goo::Canvas Scaling
use strict;
use Gtk2 '-init';
use Goo::Canvas;

my $rect;

my $window = Gtk2::Window->new;
$window->signal_connect(destroy=>sub{Gtk2->main_quit;});
$window->fullscreen;

my $canvas = Goo::Canvas->new;
#$canvas->set('integer-layout',1);
$canvas->set_size_request(1020,500);
$canvas->set_bounds(0,0,1000,500);
$canvas->set_scale(1);
$canvas->set('background-color','white');
my $base = Goo::Canvas::Group->new($canvas->get_root_item);
$base->set('line-width','1','stroke-color','black');

my $vbox = Gtk2::VBox->new;

my $holder = Goo::Canvas::Group->new($base);

$holder->set_simple_transform((1000/2)-(200/2),(500/2)-(200/2),1,0);
$holder->{'x'} = (1000/2)-(200/2);
$holder->{'y'} = (500/2)-(200/2);
$holder->{'scale'} = 1;
$holder->{'angle'} = 0;
$holder->{'width'} = 200;
$holder->{'height'} = 200;

for(my $i = 0; $i <= 1000; $i+=50){
    my $line= Goo::Canvas::Polyline->new_line($base,$i,0,$i,700);
}
for(my $i = 0; $i <= 500; $i+=50){
    my $line= Goo::Canvas::Polyline->new_line($base,0,$i,1000,$i);
}

$rect = Goo::Canvas::Rect->new ($holder,0,0,200,200,'stroke-color','red','line-width',5,'fill-color','white');
$rect->signal_connect('motion_notify_event', \&on_motion_notify);
$rect->signal_connect('button_press_event', \&on_button_press);
$rect->signal_connect('button_release_event', \&on_button_release);
my $line= Goo::Canvas::Polyline->new_line($holder,100,0,100,200,'line-width',1,'stroke-color','blue');
$line= Goo::Canvas::Polyline->new_line($holder,0,100,200,100,'line-width',1,'stroke-color','blue');
$line= Goo::Canvas::Polyline->new_line($holder,0,125,200,125,'line-width',1,'stroke-color','red');
$line= Goo::Canvas::Polyline->new_line($holder,0,75,200,75,'line-width',1,'stroke-color','red');
$line= Goo::Canvas::Polyline->new_line($holder,125,0,125,200,'line-width',1,'stroke-color','green');
$line= Goo::Canvas::Polyline->new_line($holder,75,0,75,200,'line-width',1,'stroke-color','green');

my $hbox = Gtk2::HBox->new;
my $button = Gtk2::Button->new("Scale Up!");
$button->signal_connect('clicked',sub {scale_norm(.01,$holder);});
$hbox->pack_start($button,0,1,0);
$button = Gtk2::Button->new("Scale Down!");
$button->signal_connect('clicked',sub {scale_norm(-.01,$holder);});

$hbox->pack_start($button,0,1,0);
$vbox->pack_start($canvas,0,1,0);
$vbox->pack_start($hbox,0,1,0);

$window->add($vbox);
$window->show_all;
Gtk2->main;

sub scale_norm {
    my ($factor,$group) = @_;
    $group->{'scale'}+=$factor;
    $group->{'x'}-= (($group->{'width'} * $group->{'scale'}) - $group->{'width'})/2;
    $group->set_simple_transform($group->{'x'},$group->{'y'},$group->{'scale'},$group->{'angle'});
    
    # I WANT TO GET THE SIMPLE TRANSFORM VALUES SUCH AS THE X AND Y COORDS AND SCALE AND ANGLE #
    # WITHOUT USING THE DATA RIDER THAT I MADE. PUT A COMMENT ON THE NEXT LINE TO MAKE IT RUN #
    my ($x, $y, $scale, $angle) = $group->get_simple_transform;
}

sub on_motion_notify {
    my ($item, $target, $event) = @_;
    $item->{'mouse'}->{'x'} = $event->x;
    $item->{'mouse'}->{'y'} = $event->y;
    my $canvas = $item->get_canvas;
    $canvas->grab_focus($item);
    if ( $item->{dragging} && $event->state >= 'button1-mask' ) {
        #($item->get('parent'))->translate($event->x - $item->{drag_x},$event->y - $item->{drag_y});
        my $holder = $item->get('parent');
        $holder->set_simple_transform($holder->{'x'} + $event->x - $item->{drag_x},$holder->{'y'} + $event->y - $item->{drag_y},$holder->{'scale'},$holder->{'angle'});
        $holder->{'x'} += $event->x - $item->{drag_x};
        $holder->{'y'} += $event->y - $item->{drag_y};
        #print $holder->{'x'} , ' - ' , $holder->{'y'} , "\n";
    }
    return 1;
}


sub on_button_press {
    my ($item, $target, $ev) = @_;
    if ( $ev->button == 1 ) {
        if ( $ev->state >= 'shift-mask' ) {
        } else {
            $item->{drag_x} = $ev->x;
            $item->{drag_y} = $ev->y;
            my $fleur = Gtk2::Gdk::Cursor->new('fleur');
            my $canvas = $item->get_canvas;
            $canvas->pointer_grab($item, ['pointer-motion-mask', 'button-release-mask'],$fleur, $ev->time);
            $item->{dragging} = 1;
        }
    }
    return 1;
}

sub on_button_release {
    my ($item, $target, $ev) = @_;
    my $canvas = $item->get_canvas;
    $canvas->pointer_ungrab($item, $ev->time);
    $item->{dragging} = 0;
    return 1;
}