Dear Monks, I want to create two Tk::Abstract canvases. One (lets call it Canvas1) would display a huge graph (consisting of nodes and edges) and other small canvas (lets call it Canvas2) which will contain a smaller view of the same graph (using the ViewAll function of AbstractCanvas). I want to use some simple interactions like a small rectangle in Canvas2 to scroll and view the big network of Canvas1.

Under the module description part of Tk::Abstract Canvas, I can find the topic "updating a second AbstractCanvas which is displaying the view region of the first AbstractCanvas" and a code example too, but I cannot figure out how to implement the same.

My code is something like this : 

$abstractcanvas1  = $SomeFrame->Scrolled(qw/
       AbstractCanvas -bg white
       -confine 1
       -scrollbars se/,
       )->pack(-fill   => 'both',-expand => 1);


$can = $abstractcanvas2->Subwidget('scrolled');



$abstractcanvas2  = $SomeFrame->Scrolled(qw/
       AbstractCanvas -bg white
       -confine 1
       -scrollbars se/,
       )->pack(-fill   => 'both',-expand => 1);


$can = $abstractcanvas2->Subwidget('scrolled');


## code to display the network in $Canvas1

[download]
Where should I now use this code part as described in the Module help of Tk::AbstractCanvas 
$abstractcanvas2  = $f_Left->Scrolled(qw/
       AbstractCanvas -bg white
       -confine 1
       -scrollbars se/,
       )->pack(-fill   => 'both',-expand => 1);

$can_1 = $abstractcanvas2->Subwidget('scrolled');



$abstractcanvas1->configure(-changeView => [\&changeView, $abstractcan
+vas2]);


  # viewAll if AbstractCanvas2 widget is resized.


  $abstractcanvas2->CanvasBind('<Configure>' => sub {$abstractcanvas2-
+>viewAll});
  {
    my $viewBox;
    sub changeView {
      my ($canvas2, @coords) = @_;
      $canvas2->delete($viewBox) if $viewBox;
      $viewBox = $canvas2->createRectangle(@coords, -outline => 'orang
+e');
    }
  }

[download]
And how to do it ?? Thanks, Kuntal

In reply to How to control a Tk::AbstractCanvas with a second one by KuntalBhusan

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