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Games::Blackjack 0.04
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NAME

Games::Blackjack - Blackjack Utility Classes

SYNOPSIS

use Games::Blackjack;

            # Create new shoe of cards
        my $shoe = Games::Blackjack::Shoe->new(nof_decks => 4);

            # Create two hands, player/dealer
        my $player = Games::Blackjack::Hand->new(shoe => $shoe);
        my $dealer = Games::Blackjack::Hand->new(shoe => $shoe);

            # Two dealer cards
        $dealer->draw();
        print "Dealer: ", $dealer->as_string(), "\n";
        $dealer->draw(); # 2nd card not shown

        $player->draw();
        $player->draw();
        print "Player: ", $player->as_string, "(", 
              $player->count_as_string, ")\n";

        # Let's assume player decides to stand. Dealer's turn.

           # Dealer plays Las Vegas rules
        while(!$dealer->busted() and 
              $dealer->count("soft") < 17) {
            $dealer->draw();
        }

           # Show winner (-1: Dealer, 1: Player, 1.5: Player Blackjack)
        print "Player score: ", $player->score($dealer), "\n";

DESCRIPTION

Games::Blackjack provides the plumbing for implementing Blackjack games. It was originally published in the German "Linux-Magazin", the article is available online at

http://www.linux-magazin.de/Artikel/ausgabe/2003/12/perl/perl.html

The English version appeared in the British "Linux-Magazine" 01/2004 on the newsstands and will be available online later at

http://www.linux-magazine.com/issue/38

A sample program, available in the distribution as "eg/blackjack", shows a simple command line tool allowing a simplified game against a Las-Vegas-Style dealer.

The module uses Quantum::Superpositions under the hood for educational purposes.

Classes and Methods
Games::Blackjack::Shoe
Abstracts the "shoe", the container which the dealer extracts the cards from. A shoe typically holds a number of decks of cards.

$shoe = Games::Blackjack::Shoe->new(nof_decks => $n)

        Create a new "Games::Blackjack::Shoe" object, containing the
        specified number of decks.

$shoe->remaining()

Number of cards still available in the shoe.

$shoe->reshuffle()

        Refill the shoe with a number of decks, as specified in the
        constructor call earlier and shuffle them with Fisher-Yates.

$card = $shoe->draw_card()

        Extract a card from the shoe. $card is a reference to an array
        containing the suit of the card ("Heart", "Diamond", "Spade",
        "Club") as the first element and the value ("A", "2", "3", "4", "5",
        "6", "7", "8", "9", "10", "J", "Q", "K") as the second. "undef" is
        returned if no more cards are available. This Method is being called
        by a Games::Blackjack::Hand object if its draw() method gets called.

Games::Blackjack::Hand
Abstracts a player's or the dealer's "hand", a number of cards held by either party.

$hand = Games::Blackjack::Hand->new(shoe => $shoe)

        Create a new "Games::Blackjack::Hand" object, connected to a "shoe",
        which will feed this "hand" via the "draw()" method.

$hand->draw()

        Draw a card from the shoe and put it into the hand. This will change
        the count of the hand. If the shoe runs out of cards, it
        automatically refills itself.

$hand->as_string()

Show the cards of a hand as string, e.g. "Heart A, Spade 10".

$hand->count_as_string()

Show the different counts of a hand as a string.

$hand->count($how)

        Count a hand. If $how is set to "soft", the soft count of the hand
        is calculated. If $how is set to "hard", the hard count is returned.
        If the hand is busted, undef is returned.

$hand->busted()

        Returns true if the hand is busted (hard count exceeds 21), and
        false otherwise.

$hand->blackjack()

Returns true if the hand is a Blackjack and false otherwise.

$player->score($dealer)

        Returns the score of the player against the dealer hand object,
        passed in as $dealer. According to the Blackjack rules, this can be
        -1, 0, 1 and 1.5 (if the Player has a Blackjack).

Debugging with Log::Log4perl

"Games::Blackjack" is "Log::Log4perl"-enabled. To figure out what goes on behind the scenes, simple put something like

        use Log::Log4perl qw(:easy);
        Log::Log4perl->easy_init($DEBUG);

in front of your program. For more detailed Log::Log4perl option, check out

http://log4perl.sourceforge.net

LEGALESE

Copyright 2003 by Mike Schilli, all rights reserved. This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

2003, Mike Schilli <cpan@perlmeister.com>