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        my $string_angle = (2 * 3.14) - $dest_angle;

        $image->stringFT(
            $image->colorAllocate( _get_rgb( $self->color ) ),  # fgcolor
            $self->font,                                        # .ttf path
            $self->font_size,                                   # point size
            $string_angle,                                      # rotation angle
            $dest_x,                                            # X coordinates
            $dest_y,                                            # Y coordinates
            $string,
            {
                charmap     => $self->font_charset,
            },
        );

        $dest_angle += $angle;
    }

    return $image;
}

sub _get_rgb { map hex, $_[0] =~ m/^#(..)(..)(..)$/ }

__PACKAGE__->meta->make_immutable;
no Moose;
1;

__END__
=pod

=encoding utf-8

=head1 NAME

Acme::SaBalTongMun - make a round robin (사발통문, 沙鉢通文)

=head1 VERSION

version 1.100830

=head1 SYNOPSIS

    use Acme::SaBalTongMun;
    
    my $sabal = Acme::SabalTongMun->new(
        radius    => 30,
        font      => '/home/keedi/.fonts/NanumGothic.ttf',
        font_size => 20;
        color     => '#0000FF',
        people    => [
            'a3r0',
            'jeen',
            'keedi',
            'saillinux',
        ],
    );
    
    my $image->generate;
    
    binmode STDOUT;
    print $image->png;

=head1 DESCRIPTION

This module generates a round robin.
The round robin is known as "사발통문(沙鉢通文)" in Korea.
Since all members of the group doesn't have a order,
it has been used to hide the leader of the group.
The origin of the round robin in Korea is 
Donghak Peasants Revolution(동학농민혁명, 東學農民運動).

=head1 ATTRIBUTES

=head2 radius

This attribute stores the radius
which is the center circle of the round robin.

=head2 font

This attribute stores the TrueType(*.ttf) font path.
Only the font which has unicode charmap is allowed.

=head2 font_size

This attribute stores the size of the font.

=head2 font_charset

This attribute stores the charset of the font.
This is optional and the default value is "Unicode".

=head2 color

This attribute stores the color of the font.

=head2 people

This attribte is an arrayref of strings
that are the members of the round robin.

=head1 METHODS

=head2 new

    my $sabal = Acme::SabalTongMun->new(
        radius    => 30,
        font      => '/home/keedi/.fonts/NanumGothic.ttf',
        font_size => 20;
        color     => '#0000FF',
        people    => [
            'a3r0',
            'jeen',
            'keedi',
            'saillinux',
        ],
    );

This method will create and return Acme::SabalTongMun object.