Here is a good start for you Tk Patio/Office layout designer. You will find that collision detection or "snap to grid" will be difficult.

Here is a start for collision detection, but it may be a dead end.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

my $dx;
my $dy;

my $mw = MainWindow->new;
$mw->geometry("700x600");

my $canvas = $mw->Canvas(-width => 700, -height => 565,
                -bg => 'black',
        -borderwidth => 3, 
        -relief => 'sunken',
           )->pack;

my $closebutton = $mw->Button(-text => 'Exit', -command => sub{Tk::exi
+t(0)})
               ->pack; 

my $dr = $canvas->createPolygon(0, 20, 50, 20, 50, 75, 0,75, 
                             -fill => 'red',
                 -tags => ['move','red','paver'],
                 );

my $db = $canvas->createPolygon(70, 20,
                                150,20,      
                150, 75,
                70 , 75, 
                             -fill => 'blue',
                 -tags => ['move','blue','paver'],
                 );

my $dg = $canvas->createPolygon(200, 20,
                                250,20,      
                250, 75,
                     -fill => 'green',
                 -tags => ['move','green','paver'],
                 );

my $dp = $canvas->createPolygon(300, 20,
                                350,20,      
                350, 75,
                     -fill => 'purple',
                 -tags => ['move','purple','paver'],
                 );





$canvas->bind('move', '<1>', sub {&mobileStart();});
$canvas->bind('move', '<B1-Motion>', sub {&mobileMove();});
$canvas->bind('move', '<ButtonRelease-1>', sub {&mobileStop();});


MainLoop;

sub mobileStart {
      my $ev = $canvas->XEvent;
      ($dx, $dy) = (0 - $ev->x, 0 - $ev->y);
      $canvas->raise('current');
#      print "START MOVE->  $dx  $dy\n";
}


sub mobileMove {
      my $ev = $canvas->XEvent;

#      $canvas->bind('current', '<Leave>', sub {&mobileStop();});     
+ 
      
      my @coords_in = $canvas->coords('current');
      # print "@coords_in\n";      
      
      $canvas->move('current', $ev->x + $dx, $ev->y +$dy);
      ($dx, $dy) = (0 - $ev->x, 0 - $ev->y);
      
 
#      print "MOVING->  $dx  $dy\n";
      my @coords = $canvas->coords('current');
      #print "@coords\n";
      my (@olaps) = $canvas->find('overlapping', $coords[0],$coords[1]
+,$coords[4],$coords[5], );

     foreach my $id(@olaps){ 
        print $canvas->gettags($id),"\t";
     }
      print "@olaps\n";
      print "\n";

     if(scalar @olaps > 1){
         # Redraw the rect 
         $canvas->coords('current', @coords_in);
        }

}


sub mobileStop{ &mobileMove; }
[download]

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