Yeah, basically you just want to set up a Canvas and plot your points by making "tiny circles". Here is an example using Tk::Axis, which makes a nice cartesian axis for you. It is based on Canvas. If you need help on how to plot your "tiny circles", let me know. Just read "perldoc Tk::Canvas" and search for "createOval".

I will mention one thing, if you have too many datapoints, you may find it slow to display. You probably can get around it by updating your Canvas after every 100 points or so, so you will see the graph being drawn.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;
use Tk::Axis;
# from Tk-Contrib-0.07 

my $mw = MainWindow->new();
$mw->geometry("600x600+10+10");

#the axis widget is a canvas 
#the origin is in the upper left corner, 
#so the (0,0) point corresponds to (25,575) 
#in this example (600 - margin) 

my $axis = $mw->Axis(
-background => 'white',
-height   => 600,
-width    => 600,
-margin   => 25,
-tick     => 10,
#-tickfont => $tickfont, 
#-tst      => $tst, 
#-width    => $width, 
-xmin     => 0,
-xmax     => 100,
-ymin     => 0,
-ymax     => 100,
)->pack();

$axis->Tk::bind("<Button-1>", [ \&print_xy, Ev('x'), Ev('y') ]);

MainLoop;

sub print_xy {
  print "@_\n";
  my ($canv, $x, $y) = @_;
  print "(x,y) = ", $canv->canvasx($x), ", ", $canv->canvasy($y), "\n"
+;
}
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