Not sure where you are having a problem - if you can create a simple polygon with a few vertices it is easy to add as many vertices as you like: 
my $shp_writer = Geo::Shapefile::Writer->new( $name, 'POLYGON', @attr_
+descriptions );

my $shape = [
    [86.925, 27.988],
    [86.5278, 27.744],
    [86.43, 27.365],
    # ...many more vertices
];

$shp_writer->add_shape( $shape, @attributes );

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In reply to Re: Geo::Shapefile::Writer help by tangent
in thread Geo::Shapefile::Writer help by kjslover

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