I want ice cream with pistachios, chocolate crumbles, and cherries on top. :-)

Seriously, what have you tried? It's not going to be easy to satisfy all those requirements, but it can be done with some work. Number 3 will be difficult, but not impossible. Here is a start for you, how to drag text to a position. All you need to do is open a Popup, with a text widget.... get your text, on pressing the Ok button, put it on the canvas, and drag it to where you want it.

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

# parts ripped from the testGraphics Zinc demo
# and shown by themselves for clarity

my $dx;
my $dy;

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

$mw->fontCreate('big',
   -family=>'courier',
  -weight=>'bold',
  -size=>int(-18*18/14));

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 $dragster = $canvas->createText( 50, 75, 
                             -fill => 'red',
                 -tags => ['move'],
                 -text => 'yahoo',
                 -font => 'big',
                 );

$canvas->bind('move', '<1>', sub {&mobileStart();});
$canvas->bind('move', '<B1-Motion>', sub {&mobileMove();});
$canvas->bind('move', '<ButtonRelease>', 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->move('current', $ev->x + $dx, $ev->y +$dy);
      ($dx, $dy) = (0 - $ev->x, 0 - $ev->y);
      print "MOVING->  $dx  $dy\n";
}


sub mobileStop{&mobileMove;}
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