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- #!/usr/bin/perl
-
- use strict;
- use warnings;
- use Cairo;
-
- use constant
- {
- WIDTH => 600,
- HEIGHT => 600,
- };
-
- {
- 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);
- $cr->fill;
-
- draw_caps_joins ($cr, WIDTH, HEIGHT);
-
- $cr->show_page;
-
- $surf->write_to_png ($out);
- }
-
- sub stroke_v_twice
- {
- my ($cr, $width, $height) = @_;
-
- $cr->move_to (0, 0);
- $cr->rel_line_to ($width / 2, $height / 2);
- $cr->rel_line_to ($width / 2, - $height / 2);
-
- $cr->save;
- $cr->stroke;
- $cr->restore;
-
- $cr->save;
- {
- $cr->set_line_width (2.0);
- $cr->set_line_cap ('butt');
- $cr->set_source_rgb (1, 1, 1);
- $cr->stroke;
- }
- $cr->restore;
-
- $cr->new_path;
- }
-
- sub draw_caps_joins
- {
- my ($cr, $width, $height) = @_;
-
- my $line_width = $height / 12 & (~1);
-
- $cr->set_line_width ($line_width);
- $cr->set_source_rgb (0, 0, 0);
-
- $cr->translate ($line_width, $line_width);
- $width -= 2 * $line_width;
-
- $cr->set_line_join ('bevel');
- $cr->set_line_cap ('butt');
- stroke_v_twice ($cr, $width, $height);
-
- $cr->translate (0, $height / 4 - $line_width);
- $cr->set_line_join ('miter');
- $cr->set_line_cap ('square');
- stroke_v_twice ($cr, $width, $height);
-
- $cr->translate (0, $height / 4 - $line_width);
- $cr->set_line_join ('round');
- $cr->set_line_cap ('round');
- stroke_v_twice ($cr, $width, $height);
- }
-