#!/usr/bin/perl
use strict;
use warnings;
use Cairo;
use constant
{
WIDTH => 600,
HEIGHT => 275,
M_PI => 3.14159265,
};
{
my $surf = Cairo::ImageSurface->create ('argb32', WIDTH, HEIGHT);
my $cr = Cairo::Context->create ($surf);
$0 =~ /(.*)\.pl/;
my $out = "$1.png";
$cr->rectangle (0, 0, WIDTH, HEIGHT);
$cr->set_source_rgb (1, 1, 1);
$cr->fill;
draw_stars ($cr, WIDTH, HEIGHT);
$cr->show_page;
$surf->write_to_png ($out);
}
sub star_path
{
my ($cr) = @_;
my $theta = 4 * M_PI / 5.0;
$cr->move_to (0, 0);
for (my $i = 0; $i < 4; $i++)
{
$cr->rel_line_to (1.0, 0);
$cr->rotate ($theta);
}
$cr->close_path;
}
sub draw_stars
{
my ($cr, $width, $height) = @_;
$cr->set_source_rgb (0, 0, 0);
$cr->save;
{
$cr->translate (5, $height / 2.6);
$cr->scale ($height, $height);
star_path ($cr);
$cr->set_fill_rule ('winding');
$cr->fill;
}
$cr->restore;
$cr->save;
{
$cr->translate ($width - $height - 5, $height / 2.6);
$cr->scale ($height, $height);
star_path ($cr);
$cr->set_fill_rule ('even-odd');
$cr->fill;
}
$cr->restore;
}