#!/usr/bin/perl
# $Id$
# This simple demo has been developped by C. Schlienger <celine@intuilab.com>


use Tk;
use Tk::Zinc;
use strict;
use constant;

my constant $PI=3.1416;

my $defaultfont = '-adobe-helvetica-bold-r-normal-*-120-*-*-*-*-*-*';
my $mw = MainWindow->new();


###########################################
# Text zone
###########################################

my $text = $mw->Text(-relief => 'sunken', -borderwidth => 2, -height => 4);
$text->pack(qw/-expand yes -fill both/);

$text->insert('0.0',
	      'This toy-appli shows rotations on waypoint items.
The following operations are possible:
   Click "<-" for negative rotation
   Click "->" for positive rotation' );


###########################################
# Zinc
###########################################
my $zinc_width=600;
my $zinc_height=500;
my $zinc = $mw->Zinc(-width => $zinc_width, -height => $zinc_height,
		     -font => "10x20",
		     -borderwidth => 3, -relief => 'sunken',
		     )->pack;

###########################################
# Waypoints
###########################################

my $wp_group = $zinc->add('group', 1, -visible => 1);

my $p1=[200, 200];
my $wp1 = $zinc->add('waypoint',$wp_group, 1,
		    -position => $p1,
		    -connectioncolor => 'green',
		    -symbolcolor => 'blue',
		    -labelformat => 'x20x18+0+0',
		    -leaderwidth=>'0',
		    -labeldx=>'-20'
		   );
$zinc->itemconfigure($wp1, 0,
		     -text => "DO",
		    );

my $p2=[300, 300];
my $wp2 = $zinc->add('waypoint',$wp_group, 1,
		     -position => $p2,
		     -connecteditem => $wp1,
		     -connectioncolor => 'blue',
		     -symbolcolor => 'blue',
		     -labelformat => 'x20x18+0+0',
		     -leaderwidth=>'0',
		     -labeldx=>'-20',
		     #-labeldy=>'30'
		    );

$zinc->itemconfigure($wp2, 0,
		     -text => "RE",
		    );

my $p3=[400, 150];
my $wp3 = $zinc->add('waypoint', $wp_group, 2,
		     -position => $p3,
		     -connecteditem => $wp2,
		     -connectioncolor => 'blue',
		     -symbolcolor => 'blue',
		     -labelformat => 'x20x18+0+0',
		     -leaderwidth=>'0',
		     -labeldx=>'20',
		     -labeldy=>'+10'
		    );
$zinc->itemconfigure($wp3, 0,
		     -text => "MI",
		    );

###################################################
# control panel
###################################################
my $rc = $mw->Frame()->pack();

my $left=$rc->Button(-width => 2, 
		     -height => 2,
		     -text => '<-',
		     -command=>sub{
		       #--------------------------------
		       # Negative rotation
		       #--------------------------------
		       my @centre=$zinc->coords("$wp2"); #the center of the rotation is $wp2
		       $zinc->rotate("$wp_group",-$PI/6,$centre[0],$centre[1]); 
		     })->pack(-side => 'left');

my $right=$rc->Button(-width => 2, 
		      -height => 2,
		      -text => '->',
		      -command=>sub{
			#--------------------------------
			# Positive rotation
			#--------------------------------
			my @centre=$zinc->coords("$wp2");#the center of the rotation is $wp2
			$zinc->rotate("$wp_group",+$PI/6,$centre[0],$centre[1]); 
		      })->pack(-side=>'right');




MainLoop;