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#!/usr/bin/perl
#
# $Id$
#
use strict;
use warnings;
use Cairo;
use constant
{
IMG_WIDTH => 640,
IMG_HEIGHT => 480,
M_PI => 3.14159265,
};
die "png backend not supported" unless (Cairo::HAS_PNG_FUNCTIONS);
$0 =~ /(.*)\.pl/;
my $png = "$1.png";
my $surf = Cairo::ImageSurface->create ('argb32', IMG_WIDTH, IMG_HEIGHT);
my $cr = Cairo::Context->create ($surf);
$cr->rectangle (0, 0, IMG_WIDTH, IMG_HEIGHT);
$cr->set_source_rgba (1, 1, 1, 0.5);
$cr->fill;
# black
$cr->save;
$cr->set_source_rgba (0, 0, 0, 0.5);
$cr->translate (IMG_WIDTH / 2, IMG_HEIGHT - (IMG_HEIGHT / 4));
do_star ();
$cr->restore;
# red
$cr->save;
$cr->set_source_rgba (1, 0, 0, 0.5);
$cr->translate (IMG_WIDTH / 2, IMG_HEIGHT / 4);
do_star ();
$cr->restore;
# green
$cr->save;
$cr->set_source_rgba (0, 1, 0, 0.5);
$cr->translate (IMG_WIDTH / 4, IMG_HEIGHT / 2);
do_star ();
$cr->restore;
# blue
$cr->save;
$cr->set_source_rgba (0, 0, 1, 0.5);
$cr->translate (IMG_WIDTH - (IMG_WIDTH / 4), IMG_HEIGHT / 2);
do_star ();
$cr->restore;
$cr->show_page;
$surf->write_to_png ($png);
sub do_star
{
my $mx = IMG_WIDTH / 3.0;
my $count = 100;
foreach (0..$count-1)
{
$cr->new_path;
$cr->move_to (0, 0);
$cr->rel_line_to (-$mx, 0);
$cr->stroke;
$cr->rotate ((M_PI * 2) / $count);
}
}
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