#!/usr/bin/perl
use Tk;
use strict;
my $w=20;
my $x=0;
my $y=0;

my %nums = (
   0 => ['black','yellow'],
   1 => ['yellow','black'],
   2 => ['white','green'],
   3 => ['green','white'],
   4 => ['grey','red'],
   5 => ['red','grey'],
   6 => ['blue','white'],
   7 => ['white','blue'],
   8 => ['orange','grey45'],
   9 => ['grey45','orange'],
);


my $mw=tkinit;
my $c = $mw->Canvas->pack;

for (0..9) {
 my $item=$c->createRectangle($x,$y,$x+20,$y+20,
             -fill=> ${$nums{$_}}[0],
             -tags => ['rect']
          );

my $text = $c->createText($x+10,$y+10,
           -anchor=>'center',
           -fill => ${$nums{$_}}[1],
           -text => $_,
           -tags => ['num','upper-left-corner']
          );

      $x+=20;
}

$mw->Button(
    -text    => "Hide Text",
    -command => sub {
            $c->lower('num','rect');
             })->pack;

$mw->Button(
    -text    => "Show Text",
    -command => sub {
            $c->raise('num','rect');
             })->pack;
MainLoop;