$canwellsketch->postscript(
    -file      => "test.ps",
    -x         => ( $canwellsketch->bbox( "all" ) )[0],
    -y         => ( $canwellsketch->bbox( "all" ) )[1],
    -width     => 600,
    -height    => 400,
    -pagewidth => 600,
  );