#!/usr/bin/perl -w

use Tk;
use strict;

# Main program / GUI setup
my $mw = MainWindow->new;
my $c = $mw->Scrolled('Canvas', -width => 200, -height => 200)->grid;
$c->configure(-background =>'blue', -scrollregion => [ 0, 0, 500, 500 ]);

#Grid
$c->createGrid(0, 0, 10, 10);
$c->createGrid(0, 0, 100, 100, -lines => 1, -dash => '.-');

$c->pack(-expand => 1, -fill => 'both');

my $rect = $c->createRectangle(20, 20, 40, 40, 
	-outline => 'yellow', 
	-fill => 'yellow');

MainLoop;

##</code><code>##

#!/usr/bin/perl -w             
use Tk;
use strict;  
                                                
my $mw = MainWindow->new;

$mw->geometry('300x300'); #try this
 
my $c = $mw->Scrolled('Canvas',
-width => 200,
-height => 200,
-background =>'blue',
-scrollregion => [ 0, 0, 500, 500 ]
)->pack(-expand => -2, -fill => 'both');

$c->createRectangle(100, 100, 150, 150, -fill => 'red');
$c->createRectangle(100, 400, 150, 450, -fill => 'green');

my $plus = $c->Button( 
   -text    => '  +  ', 
       -command => sub {$c->scale("all", 125, 125, 2, 2); } );
   $plus->pack;      
   
my $minus = $c->Button( 
	-text    => '  .  ', 
	-command => sub {$c->scale("all", 125, 125, 0.5, 0.5); } );
   $minus->pack;  


MainLoop;