Code Index:

package Math::MagicSquare::Generator
- _sum
- new
- hflip
- vflip
- sum
- check
- as_string
- as_html
- as_csv
__END__
EOF

NAME

Math::MagicSquare::Generator - Magic Square Generator

SYNOPSIS

    use Math::MagicSquare::Generator

    my $square = Math::MagicSquare::Generator->new(size => 5,
                                                   step => 3,
						   start=> 6);
    for ($square, $square->vflip, $square->hflip) {
	print $_->as_string;
	print "-----\n";
    }

    $square->[0][0] = -15; # Break magic :)
    print $square->check ? "Magic square\n" : "Just a square\n";

    print '<html><body>';
    print Math::MagicSquare::Generator->new->hflip->vflip->as_html;
    print '</body></html>';

DESCRIPTION

This module creates magic squares. A magic square is a square in which all numbers are different and the sums of all rows, all columns and the two diagonals are equal. Math::MagicSquare::Generator cannot create panmagic squares, or squares that have an even size. (A panmagic square is magic square where the "wrapped" diagonals are also equal.)

EXAMPLE

     3 16  9 22 15  This square is the output of
    20  8 21 14  2  print Math::MagicSquare::Generator->new->as_string;
     7 25 13  1 19
    24 12  5 18  6
    11  4 17 10 23

    The sums of the rows are 65.
    The sums of the columns are 65.
    The sums of the diagonals are 65.

METHODS

new: The constructor that generates the square immediately. It creates an object using the given named arguments. Valid arguments are size, step and start. size has to be positive, odd and integer.
check: A checker - returns the common sum if the square is magic, or undef if it's not. Because the sum can never be 0, you can use this as a boolean value. (Well, the sum in a 1x1 square can be 0, if the single number is 0.) You can use this method to check if the square has been tampered with.
sum: Returns the common sum of the rows, columns and diagonals.
vflip, hflip: These methods return a vertically or horizontally flipped clone of the square. The clone is a Math::MagicSquare::Generator, so stacking these methods is possible.
as_string, as_html, as_csv: DWYM - return the square as a formatted string, piece of html or in CSV format.

THIS MODULE AND Math::MagicSquare

Math::MagicSquare is a module that checks if a square is magical. It takes a list in its new method, so you'll have to dereference the generated square:

    use Math::MagicSquare;
    use Math::MagicSquare::Generator;

    my $square = Math::MagicSquare::Generator->new;
    print Math::MagicSquare->new( @$square )->check, "\n"; # 2

Its check will always return 2 for squares generated using this module (or 3 if it's a 1x1 square).

KNOWN BUGS

None yet.

AUTHOR

Juerd <juerd@juerd.nl>