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Re: Tk::canvas - Cavas coord problem

by ungalnanban (Pilgrim)
on May 12, 2010 at 08:52 UTC ( #839566=note: print w/ replies, xml ) Need Help??


in reply to Tk::canvas - Cavas coord problem

Refer the following sample code I got it from net. I think this will help you.

#!/usr/bin/perl -w use Tk; use strict; # Create B<MainWindow> and canvas my $mw = MainWindow->new; my $canvas = $mw->Canvas; $canvas->pack(-expand => 1, -fill => 'both'); # Create various items create_item($canvas, 1, 1, 'circle', 'blue', 'Jane'); create_item($canvas, 4, 4, 'circle', 'red', 'Peter'); create_item($canvas, 4, 1, 'square', 'blue', 'James'); create_item($canvas, 1, 4, 'square', 'red', 'Patricia'); # Single-clicking with left on a 'circle' item invokes a procedure $canvas->bind('circle', '<1>' => sub {handle_circle($canvas)}); # Double-clicking with left on a 'blue' item invokes a procedure $canvas->bind('blue', '<Double-1>' => sub {handle_blue($canvas)}); MainLoop; # Create an item; use parameters as tags (this is not a default!) sub create_item { my ($can, $x, $y, $form, $color, $name) = @_; my $x2 = $x + 1; my $y2 = $y + 1; my $kind; $kind = 'oval' if ($form eq 'circle'); $kind = 'rectangle' if ($form eq 'square'); $can->create( ($kind, "$x" . 'c', "$y" . 'c', "$x2" . 'c', "$y2" . 'c'), -tags => [$form, $color, $name], -fill => $color); } # This gets the real name (not current, blue/red, square/circle) # Note: you'll want to return a list in realistic situations... sub get_name { my ($can) = @_; my $item = $can->find('withtag', 'current'); my @taglist = $can->gettags($item); my $name; foreach (@taglist) { next if ($_ eq 'current'); next if ($_ eq 'red' or $_ eq 'blue'); next if ($_ eq 'square' or $_ eq 'circle'); $name = $_; last; } return $name; } sub handle_circle { my ($can) = @_; my $name = get_name($can); print "Action on circle $name...\n"; } sub handle_blue { my ($can) = @_; my $name = get_name($can); print "Action on blue item $name...\n"; }


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