Hey nice example, and it brought my attention to Tk::Chart and Tk::Canvas::GradientColor. Nice stuff.

Getting back to your problem with the rectangle, it's hard to run your program without the maplog file

DBD::SQLite::db prepare failed: no such table: maplog at ./921422.pl l
+ine 138.
[download]

Can you either provide a minimal maplog file, or make an example with some builtin data?

It should be simple enough to make the rectangle disappear, since it is all Canvas based, and you can (or should) be able to put Canvas tags on the rectangle to make them disappear.

In the meantime, here is a simple example of creating a draggable rectangle, which is also movable after creation.

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

my $rect_ready = 0; #flag for setting ready to drag
my $dx;
my $dy;

my $mw = new MainWindow(
        -width => 500,
        -height => 500 );

my $canvas = $mw->Canvas(
        -width      => 500,
        -height     => 500,
        -background => 'white',
    )->pack;

$mw->bind('Tk::Canvas', '<ButtonPress-1>' => \&start_rect);
$mw->bind('Tk::Canvas', '<ButtonRelease-1>' => \&stop_rect);

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

MainLoop;
###################################################################
sub start_rect {
    return if $rect_ready;
    my $canvas = shift;
    my $event = $canvas->XEvent;
    my $x = $canvas->canvasx($event->x);
    my $y = $canvas->canvasy($event->y);
    
    $canvas->create('rectangle', $x, $y, $x+10, $y+10, 
                 -width => 5,
                 -tags => ['rect','move']);

    $mw->bind( 'Tk::Canvas','<Motion>' => \&making_rect );
}
###############################################################

sub stop_rect {
    my $canvas = shift;
    $mw->bind('Tk::Canvas', '<Motion>' => undef );   
    $rect_ready = 1;
}
#############################################################
sub making_rect {
    my $canvas = shift;
    my $event = $canvas ->XEvent;
    my $x = $canvas->canvasx($event->x);
    my $y = $canvas->canvasy($event->y);

    my ($x0,$y0,$x1,$y1) = $canvas->coords('rect');
#    $canvas->coords('rect', $x0, $y0, $x, $y );

    $canvas->delete('rect');
    $canvas->create('rectangle', $x0, $y0, $x, $y, 
                  -width => 5,
          -activewidth => 10,
                  -tags => ['rect','move']);

}
##############################################################

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;}
##############################################################
[download]

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