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package CanvasFifteen;
use strict;
use Gnome2::Canvas;
use Glib qw(TRUE FALSE);
use constant PIECE_SIZE => 50;
sub test_win {
my ($window, $board) = @_;
for (my $i = 0; $i < 15; $i++) {
if (!$board->[$i] || ($board->[$i]{piece_num} != $i)) {
return;
}
}
my $dlg = Gtk2::MessageDialog->new ($window, 'destroy-with-parent',
'info', 'ok', "You stud, you win!");
$dlg->signal_connect (response => sub {$_[0]->destroy});
$dlg->run;
}
sub get_piece_color {
my ($piece) = @_;
my $y = $piece / 4;
my $x = $piece % 4;
my $r = ((4 - $x) * 255) / 4;
my $g = ((4 - $y) * 255) / 4;
my $b = 128;
return sprintf "#%02x%02x%02x", $r, $g, $b;
}
sub piece_event {
my ($item, $event) = @_;
my $board = $item->canvas->{board};
my $num = $item->{piece_num};
my $pos = $item->{piece_pos};
my $text = $item->{text};
if ($event->type eq 'enter-notify') {
$text->set (fill_color => "white");
} elsif ($event->type eq 'leave-notify') {
$text->set (fill_color => "black");
} elsif ($event->type eq 'button-press') {
my $y = int ($pos / 4);
my $x = int ($pos % 4);
my ($dx, $dy) = (0.0, 0.0);
my $move = TRUE;
if (($y > 0) && (! $board->[($y - 1) * 4 + $x])) {
$dx = 0.0;
$dy = -1.0;
$y--;
} elsif (($y < 3) && (! $board->[($y + 1) * 4 + $x])) {
$dx = 0.0;
$dy = 1.0;
$y++;
} elsif (($x > 0) && (! $board->[$y * 4 + $x - 1])) {
$dx = -1.0;
$dy = 0.0;
$x--;
} elsif (($x < 3) && (! $board->[$y * 4 + $x + 1])) {
$dx = 1.0;
$dy = 0.0;
$x++;
} else {
$move = FALSE;
}
if ($move) {
my $newpos = $y * 4 + $x;
$board->[$pos] = undef;
$board->[$newpos] = $item;
$item->{piece_pos} = $newpos;
$item->move ($dx * PIECE_SIZE, $dy * PIECE_SIZE);
test_win ($item->canvas->get_toplevel, $board);
}
}
return FALSE;
}
use constant SCRAMBLE_MOVES => 256;
sub scramble {
my (undef, $canvas) = @_;
my $board = $canvas->{board};
# First, find the blank spot
my $pos;
for ($pos = 0; $pos < 16; $pos++) {
last if not defined $board->[$pos];
}
# "Move the blank spot" around in order to scramble the pieces
for (my $i = 0; $i < SCRAMBLE_MOVES; $i++) {
my ($x, $y) = (0, 0);
do {
my $dir = rand (65535) % 4;
($x, $y) = (0, 0);
if (($dir == 0) && ($pos > 3)) { # up
$y = -1;
} elsif (($dir == 1) && ($pos < 12)) { # down
$y = 1;
} elsif (($dir == 2) && (($pos % 4) != 0)) { # left
$x = -1;
} elsif (($dir == 3) && (($pos % 4) != 3)) { # right
$x = 1;
}
} while ($x == $y);
my $oldpos = $pos + $y * 4 + $x;
$board->[$pos] = $board->[$oldpos];
$board->[$oldpos] = undef;
$board->[$pos]{piece_pos} = $pos;
$board->[$pos]->move (-$x * PIECE_SIZE, -$y * PIECE_SIZE);
$canvas->update_now;
$pos = $oldpos;
}
}
sub create {
my $vbox = Gtk2::VBox->new (FALSE, 4);
$vbox->set_border_width (4);
$vbox->show;
my $alignment = Gtk2::Alignment->new (0.5, 0.5, 0.0, 0.0);
$vbox->pack_start ($alignment, TRUE, TRUE, 0);
$alignment->show;
my $frame = Gtk2::Frame->new;
$frame->set_shadow_type ('in');
$alignment->add ($frame);
$frame->show;
# Create the canvas and board
my $canvas = Gnome2::Canvas->new;
$canvas->set_size_request (PIECE_SIZE * 4 + 1, PIECE_SIZE * 4 + 1);
$canvas->set_scroll_region (0, 0, PIECE_SIZE * 4 + 1, PIECE_SIZE * 4 + 1);
$frame->add ($canvas);
$canvas->show;
my @board = ();
$canvas->{board} = \@board;
for (my $i = 0; $i < 15; $i++) {
my $y = int ($i / 4);
my $x = int ($i % 4);
$board[$i] = Gnome2::Canvas::Item->new
($canvas->root,
Gnome2::Canvas::Group::,
x => $x * PIECE_SIZE,
y => $y * PIECE_SIZE);
Gnome2::Canvas::Item->new ($board[$i],
Gnome2::Canvas::Rect::,
x1 => 0.0,
y1 => 0.0,
x2 => PIECE_SIZE,
y2 => PIECE_SIZE,
fill_color => get_piece_color ($i),
outline_color => "black",
width_pixels => 0);
my $text = Gnome2::Canvas::Item->new
($board[$i],
Gnome2::Canvas::Text::,
text => sprintf ('%d', $i+1),
x => PIECE_SIZE / 2.0,
y => PIECE_SIZE / 2.0,
font => 'Sans bold 24',
anchor => 'center',
fill_color => 'black');
$board[$i]{piece_num} = $i;
$board[$i]{piece_pos} = $i;
$board[$i]{text} = $text;
$board[$i]->signal_connect (event => \&piece_event);
}
$board[15] = undef;
# Scramble button
my $button = Gtk2::Button->new_with_label ("Scramble");
$vbox->pack_start ($button, FALSE, FALSE, 0);
$button->{board} = \@board;
$button->signal_connect (clicked => \&scramble, $canvas);
$button->show;
return $vbox;
}
1;
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