File Coverage

blib/lib/Math/MagicSquare/Generator.pm

Criterion	Covered	Total	%
statement	46	66	69.7
branch	11	18	61.1
condition	5	15	33.3
subroutine	7	12	58.3
pod	8	8	100.0
total	77	119	64.7

package Math::MagicSquare::Generator;
use strict;
use Carp;
use vars qw($VERSION);

$VERSION = '0.01';

sub _sum {
    my $sum = 0;
    $sum += $_ for @_;
    return $sum
}

sub new {
    my ($class, %opt) = @_;
    $opt{size}  ||= 5;
    $opt{start} ||= 1;
    $opt{step}  ||= 1;
    croak "Size needs to be a positive, odd integer"
	unless $opt{size} > 0 and
	       $opt{size} % 2 and
	       $opt{size} == int($opt{size});
    my $self = [
	map {
	    [ (undef) x $opt{size} ]
	} 1..$opt{size}
    ];
    my $value = $opt{start};
    my $halv = int(@$self / 2);
    for my $start_x (-$halv..$halv) {
	my $x = $start_x - 1;
	my $y = $x + @$self + 1;
	for (1 .. @$self) {
	    $x = $x - @$self if ++$x > $#$self;
	    $y = $y - @$self if --$y > $#$self;
	    $self->[$y][$x] = $value;
	    $value += $opt{step};
	}
    }
    return bless $self, $class;
}

sub hflip {
    my ($self) = @_;
    my $clone;
    push @$clone, [ reverse @$_ ] for @$self;
    return bless $clone, ref $self;
}

sub vflip {
    my ($self) = @_;
    my $clone;
    push @$clone, [ @$_ ] for reverse @$self;
    return bless $clone, ref $self;
}

sub sum {
    my ($self) = @_;
    return _sum( @{ $self->[0] } );
}

sub check {
    my ($self) = @_;
    my $sum = $self->sum;
    # Horizontals
    for (@$self[1..$#$self]) {
	return undef if @$_ > @$self; # undef if not square
	return undef if _sum(@$_) != $sum;
    }
    # Verticals
    for my $x (0..$#$self) {
	return undef if _sum(map $self->[$_][$x], 0..$#$self) != $sum;
    }
    # Diagonals
    return undef if _sum(map $self->[$_][$_],           0..$#$self) != $sum;
    return undef if _sum(map $self->[$#$self - $_][$_], 0..$#$self) != $sum;
    # Duplicates
    my %seen;
    $seen{$_}++ for map @$_, @$self;
    return undef if _sum(values %seen) != keys %seen;
    # Passed all tests!
    return $sum;
}

sub as_string {
    my ($self) = @_;
    my $max = 0;
    length > $max and $max = length for map @$_, @$self;
    return map { join(' ', map {' 'x($max - length) . $_} @$_) . "\n" } @$self;
}

sub as_html {
    my ($self) = @_;
    return "\n" . join("\n", ' } @$self) . 




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 	map { '' . join('', @$_) . '




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 	"\n\n";
	map { '
	"\n
}

sub as_csv {
    my ($self) = @_;
    return join("\n", map { join ',', @$_ } @$self) . "\n";
}

1;

__END__