#!/usr/bin/perl
use warnings;
use strict;
use Tk;
use Tk::JPEG;
use Tk::PNG;

my ($dx,$dy);
my $mw  = Tk::MainWindow->new;

$mw->fontCreate('big',
   -family=>'arial',
   -weight=>'bold',
   -size=> 10);

my $can = $mw->Scrolled('Canvas',
                 -height => 400,
		 -width  => 400,
		 -bg => 'black',
		 -scrollbars => 'osoe',
                 -highlightthickness=>0,
		 -borderwidth =>0,
                 )->pack( -fill =>'both',-expand=>1);

my $realcan = $can->Subwidget('scrolled');

#my $img = $mw->Photo( -file => $file );

#$can->createImage(0,0,  #hardcoded offset
#                  -image => $img, 
#		  -anchor => 'nw',
#		  -tags => ['img'],
#		   );

#my @bbox = $can->bbox( 'img'  );

#$can->configure(-scrollregion => [@bbox] );

my $text = 'This is some text';
$can->createText(50,50,
    -text   => $text,
    -fill =>'yellow',
    -anchor => 'nw',
    -font   => 'big',
    -tags=> ['move']
    );

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

MainLoop;

sub mobileStart {
      my $ev = $realcan->XEvent;
      ($dx, $dy) = (0 - $ev->x, 0 - $ev->y);
      $realcan->raise('current');
      print "START MOVE->  $dx  $dy\n";
}

sub mobileMove {
      my $ev = $realcan->XEvent;
      $realcan->move('current', $ev->x + $dx, $ev->y +$dy);
      ($dx, $dy) = (0 - $ev->x, 0 - $ev->y);
      print "MOVING->  $dx  $dy\n";
}

sub mobileStop{&mobileMove;}



##</code><code>##

#!/usr/bin/perl 
use warnings;
use strict;
use Tk;
use Tk::JPEG;
use Tk::PNG;

#demonstrates need for subwidget method
#on Scrolled Canvas, to use lower or raise

my $mw = new MainWindow;

my $canvas  = $mw->Scrolled('Canvas', 
       -bg  => 'white',
       -xscrollincrement => 1,
       -yscrollincrement => 1,
       -confine => 1,
       -scrollbars => 'se',
       -width => 200,
       -height => 200,
       -closeenough =>3,
       -scrollregion => [ 0, 0, 500, 500 ], 
)->pack(qw/ -fill both -expand 1 -side top/);


my $realcanvas = $canvas->Subwidget('scrolled');

$mw->Button(-text=>"Raise Bunny",
            -command => sub{
     # $canvas->lower( 'bunny' ,'tux' ); # will cause error
     # need subwidget of the scrolled canvas

     $realcanvas->raise( 'bunny' ,'tux' );
	    })->pack();

$mw->Button(-text=>"Lower Bunny",
            -command => sub{
         $realcanvas->lower( 'bunny' ,'tux' );
	    })->pack();



my $tux = $mw->Photo(-file => 'tux.jpg' );

$canvas->createImage( 0, 0, -image => $tux, 
                            -anchor => 'nw',
			    -tags => ['tux'],
			     );

my $bunny = $mw->Photo(-file => 'bunny.jpg' );
$canvas->createImage( 40, 40, -image => $bunny, 
                            -anchor => 'nw',
			    -tags => ['bunny'],
			     );


my $lineseg = $canvas->createLine(
         1,1,200,200, 
         -fill => 'red',
         -tags => ['line']
     );

# $canvas->lower( 'bunny' ,'tux' ); # will cause error
# need subwidget
$realcanvas->lower( 'bunny' ,'tux' );

MainLoop;

##</code><code>##

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

my $top = new MainWindow;

my $c=$top->Canvas->pack;

my $circle = $c->createOval(30,30,100,100,
               -fill => 'blue',  
               -tags =>['circle'],
               -stipple => 'gray12',
	      );

my $rect1 = $c->createRectangle(10,10,44,44,
               -fill => 'green',  
               -stipple => 'gray12',
               -tags =>['rect1'],
              );


my $rect2 = $c->createRectangle(93,93,200,200,
               -fill => 'yellow',  
               -tags =>['rect2'],
               -stipple => 'gray12',
	       );

my $poly1 = $c->createPolygon(0,0, 44,44, 55,55, 90,90, 200,200, 10,100,0,0,
                    -fill => 'red',
		    -smooth => 1,       
                    -splinesteps => 100,
		    -stipple => 'gray12',
		    -tags =>['poly1'],
		    );

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

&print_xy($c, 42,42);

MainLoop;

sub print_xy {
  my ($canv, $x, $y) = @_;
 print "(x,y) = ", $canv->canvasx($x), ", ", $canv->canvasy($y), "\n";
#my $x1 = $x+1;
#my $y1 = $y+1;
#it will actually use a zero size rectangle
my (@current) = $canv->find('overlapping', $x, $y, $x, $y);

foreach my $id(@current){ 
    print $canv->gettags($id),' ';
}

print "\n";

}