Does anyone know of good documentation or example code that uses Tk events?

It was difficult for me to discover that $e->X and friends did what I wanted.

It seems like the documentation of bind() could use a few more examples in perldoc Tk::bind. There wasn't much in O'Reilly's Mastering Tk along the lines of my code, either.

Am I missing something? Am I writing this code in an unusual way, and perhaps there is another way to do it that has examples in the documentation?

I have been able to find some interesting information by looking at tkBind.c in the pTk source code.

use strict;
use warnings;
use diagnostics;
use Tk;

my $mw= MainWindow->new;

my $canvas= $mw->Canvas( -background => 'black',
             -width      => '100',
             -height     => '200',
                       )->pack;

$canvas->CanvasBind('<Motion>', \&print_coords);
&MainLoop;

sub print_coords
{
  my ($evt) = @_;
  my $e= $evt->XEvent;
  print $e->X,',',$e->Y,'  ',$e->x,',',$e->y,"\n";
}
[download]

It should work perfectly the first time! - toma