-#!/usr/bin/perl
-
-use strict;
-use warnings;
-
-use Gtk2 -init;
-use Cairo;
-
-my $area = Gtk2::DrawingArea->new();
-my $cairo;
-my $PI = 3.1415926535;
-my $TWOPI = 2*$PI;
-
-my $rad = 30;
-my $rim = 2;
-my $arrow_dist = 10;
-my $arrow_span = 5;
-
-sub draw_vertex($$) {
- my ($x, $y) = @_;
-
- my $lg = Cairo::RadialGradient->create($x, $y, 0, $x, $y, $rad);
- $lg->add_color_stop_rgb(0, 0.7, 0, 0.7);
- $lg->add_color_stop_rgb(1, 0.3, 0, 0.3);
-
- $cairo->arc($x, $y, $rad, 0, $TWOPI);
- $cairo->set_source($lg);
- $cairo->fill;
-
- $cairo->arc($x, $y, $rad, 0, $TWOPI);
- $cairo->set_source_rgb(1, 1, 1);
- $cairo->set_line_width($rim);
- $cairo->stroke;
-
- $cairo->set_font_size(0.6*$rad);
- my $xt = $cairo->text_extents('Brum');
- $cairo->move_to($x - $xt->{'width'}/2 - $xt->{'x_bearing'},
- $y - $xt->{'height'}/2 - $xt->{'y_bearing'});
- $cairo->show_text("Brum");
-}
-
-sub draw_edge($$$$) {
- my ($x1, $y1, $x2, $y2) = @_;
- my $dx = $x2 - $x1;
- my $dy = $y2 - $y1;
- my $d = sqrt($dx*$dx + $dy*$dy);
-
- $x1 += $dx * $rad/$d;
- $y1 += $dy * $rad/$d;
- $x2 -= $dx * $rad/$d;
- $y2 -= $dy * $rad/$d;
-
- $cairo->set_source_rgb(1, 1, 1);
-
- $cairo->move_to($x1, $y1);
- $cairo->line_to($x2, $y2);
- $cairo->set_line_width(2);
- $cairo->stroke;
-
- my $ax = $x2 - $dx * $arrow_dist/$d;
- my $ay = $y2 - $dy * $arrow_dist/$d;
- my $adx = -$dy;
- my $ady = $dx;
- ($adx, $ady) = ($adx * $arrow_span/$d, $ady * $arrow_span/$d);
- $cairo->move_to($x2, $y2);
- $cairo->line_to($ax+$adx, $ay+$ady);
- $cairo->line_to($ax-$adx, $ay-$ady);
- $cairo->close_path;
- $cairo->fill;
-}
-
-my $xx=0;
-my $pixmap;
-my ($lastw, $lasth, $lastd) = (-1, -1, -1);
-my ($pixw, $pixh) = (-1, -1);
-sub draw($) {
- my ($force) = @_;
- my $win = $area->window;
- my $wgc = Gtk2::Gdk::GC->new($win);
- my $alloc = $area->allocation;
- my $w = $alloc->width;
- my $h = $alloc->height;
- my $d = $win->get_depth;
- # print "Area $w x $h x $d, xx=$xx\n";
-
- if (!defined($pixmap) || $lastw != $w || $lasth != $h || $lastd != $d) {
- ($lastw, $lasth, $lastd) = ($w, $h, $d);
- if ($w/$h >= 4/3) {
- $pixh = $h;
- $pixw = int($h/3*4);
- } else {
- $pixw = $w;
- $pixh = int($w/4*3);
- }
- print "Resized to ${w}x${h}, pixmap size ${pixw}x${pixh}\n";
-
- $pixmap = Gtk2::Gdk::Pixmap->new($win, $pixw, $pixh, $d);
- $cairo = Gtk2::Gdk::Cairo::Context->create($pixmap);
- $cairo->select_font_face('URW Palladio L', 'normal', 'normal');
- my $scale = $pixw/1024;
- $cairo->scale($scale, $scale);
- }
-
- if ($force) {
- $wgc->set_rgb_background(0);
- $wgc->set_rgb_foreground(0);
- $win->draw_rectangle($wgc, 1, 0, 0, $w, $h);
- }
-
- $cairo->rectangle(0, 0, 1024, 768);
- $cairo->set_source_rgb(0, 0, 0);
- $cairo->fill;
-
- my @v = ();
- for (my $i=0; $i<6; $i++) {
- my $a = $TWOPI/6 * $i + $TWOPI/400*$xx;
- my $x = int(1024/2 + 300*cos($a));
- my $y = int(768/2 + 300*sin($a));
- draw_vertex($x, $y);
- push @v, { 'x' => $x, 'y' => $y };
- }
-
- for (my $i=1; $i<6; $i++) {
- for (my $j=0; $j<$i; $j++) {
- my $v = $v[$i];
- my $w = $v[$j];
- draw_edge($v->{'x'}, $v->{'y'}, $w->{'x'}, $w->{'y'});
- }
- }
-
- $win->draw_drawable($wgc, $pixmap, 0, 0, 0, 0, $pixw, $pixh);
-}
-
-sub step() {
- draw(0);
- $xx++;
-}
-
-my $timer;
-my $stopped = 0;
-$area->signal_connect("expose-event" => sub {
- draw(1);
- if (!defined $timer) {
- $timer = Glib::Timeout->add(30, sub { $stopped || step(); return 1; });
- }
-});
-$area->set_flags('can-focus');
-# $area->add_events('key-press-mask');
-$area->signal_connect('key-press-event' => sub {
- my ($w, $evt) = @_;
- my $k = Gtk2::Gdk::keyval_name(0, $evt->keyval);
- print "Pressed key $k\n";
- if ($k eq "Escape") {
- Gtk2->main_quit;
- } elsif ($k eq "space") {
- $stopped = !$stopped;
- }
-});
-
-my $window = Gtk2::Window->new ('toplevel');
-$window->signal_connect ("delete-event" => sub { Gtk2->main_quit });
-$window->set_title("Brum");
-$window->set_wmclass("anim", "Anim");
-$window->set_default_size(640, 480);
-$window->add ($area);
-$window->show_all;
-#$window->fullscreen;
-
-Gtk2->main;