#
#  Copyright (c) 1997-2002 The Protein Laboratory, University of Copenhagen
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#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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#  $Id$
#
=pod 

=head1 NAME

examples/f_fill.pl - A gradient fill example

=head1 FEATURES

Demonstrates the usage of graphic context regions.
Note that the $i region is not created, but is assigned
on every onPaint. Tests whether image object is able
to hold a cached region copy.

=cut

use strict;
use Prima qw(Application);

my $i = Prima::Image-> create(
preserveType => 1,
type => im::BW,
font => { size => 100, style => fs::Bold|fs::Italic },
);
$i-> begin_paint_info;
my $textx = $i-> get_text_width( "PRIMA");
my $texty = $i-> font-> height;
$i-> end_paint_info;
$i-> size( $textx + 20, $texty + 20);

my @is = $i-> size;
$i-> begin_paint;
$i-> color( cl::Black);
$i-> bar(0,0,@is);
$i-> color( cl::White);
$i-> text_out( "PRIMA", 0,0);
$i-> end_paint;


my @xpal = ();
for ( 1..32) {
	my $x = (32-$_) * 8;
	push(@xpal, $x,$x,$x);
};

my $w = Prima::MainWindow-> create(
	size   => [ @is],
	centered => 1,
	buffered => 1,
	palette => [ @xpal],
	onPaint => sub {
	my ( $self, $canvas) = @_;
	$canvas-> color( cl::Back);
	$canvas-> bar( 0, 0, $canvas-> size);
	my $xrad = $is[0] / 62;
	for ( 1..32) {
		my $x = (32-$_) * 8;
		$x = ($x<<16)|($x<<8)|$x;
        $canvas-> color($x);
        $canvas-> fill_ellipse($is[0]/2,$is[1]/2, $xrad*(32-$_)*2, $xrad*(32-$_)*2);
     };
     $canvas-> region( $i);
     for ( 1..32) {
        my $x = ($_-1) * 8;
        $x = ($x<<16)|($x<<8)|$x;
        $canvas-> color($x);
        $canvas-> fill_ellipse($is[0]/2,$is[1]/2, $xrad*(32-$_)*2, $xrad*(32-$_)*2);
     };
  },
);

run Prima;