$mw->Button(
    -text    => "Save PS",
    -command => [sub {
         $canv->update;
         my @capture=();
         my ($x0,$y0,$x1,$y1)=$canv->bbox('all');
         @capture=('-x'=>$x0,'-y'=>$y0,-height=>$y1-$y0,-width=>$x1-$x0);
         $canv->postscript(-colormode=>'color',
                               -file=>$0.'.ps',
                               -rotate=>0,
                               -width=>2400,
                               -height=>3400,
                               @capture);

                      }
  ]  )->pack;