use GD;
use GD::Text::Align;

my $gd = GD::Image->new(800,600);
# allocate colours, do other things.

my $align = GD::Text::Align->new(
    $gd  #instance of GD::Image
    valign => 'top',
    halign => 'right',
  );
$align->set_font('cetus.ttf', 12);
$align->set_text('some string');
@bb = $align->bounding_box(200, 400, PI/3);
# you can do things based on the bounding box here
$align->draw(200, 400, PI/3);

open(JPEG,">foo.jpg");
binmode(JPEG);
print JPEG $gd->jpeg(75);
close(JPEG);