[rt-users] Graphviz anti-aliased output?

[Aaron Hathaway]

> -----Original Message-----
> From: ruslan.zakirov at gmail.com [mailto:ruslan.zakirov at gmail.com] On Behalf Of
> Ruslan Zakirov
> Sent: Sunday, August 24, 2008 11:25 PM
> To: Aaron Hathaway
> Cc: rt-users at lists.bestpractical.com
> Subject: Re: [rt-users] Graphviz anti-aliased output?
> 
> On Mon, Aug 25, 2008 at 8:56 AM, Aaron Hathaway
> <aaron.hathaway at prager.com> wrote:
> > Message: 2
> > Date: Sun, 24 Aug 2008 16:54:30 +1000
> > From: trentbuck at gmail.com (Trent W. Buck)
> > Subject: Re: [rt-users] Graphviz anti-aliased output?
> > To: rt-users at lists.fsck.com
> > Message-ID: <30bpzikimx.fsf at Clio.twb.ath.cx>
> > Content-Type: text/plain; charset=us-ascii
> >
> > "Aaron Hathaway" <aaron.hathaway at prager.com> writes:
> >
> >> I know the latest version of Graphviz can output lovely anti-aliased
> >> graphs.  Is there an easy way to get RT to anti-alias its Graphviz
> >> output?
> >
> >
> > (Note: I have yet to look at RT's graphviz integration.)
> >
> > Perhaps an easy way would be to tell RT to use dot -Tsvg instead of
> > -Tpng?  Then the web pages would include SVG and be rendered client-side
> > (and thus be antialiased in Firefox, at least).
> >
> > OTOH, this seems to be antialiased already (with graphviz 2.20):
> >
> >     echo 'digraph { x -> y; }' | dot -Tpng | with-temp-file display
> >
> > so perhaps you just need to upgrade your Graphviz?
> >
> > I'm also running 2.2, and by default, it does output with anti-aliasing.
> > But RT's implementation doesn't.
> >
> > I think this has to do with the perl module GraphViz, which handles
> > integration with graphviz.  I'm not sure the module can take advantage of
> > anti-aliasing--but I don't know.
> This module generates a graph in dot format. May be we use some
> properties that disable anti-aliasing. I did some googling, but havn't
> found anything interesting.
> --
> Best regards, Ruslan.

It's a limitation of the module.  I ran the test code from the module's README:

      use GraphViz;

      my $g = GraphViz->new();

      $g->add_node('London');
      $g->add_node('Paris', label => 'City of\nlurve');
      $g->add_node('New York');

      $g->add_edge('London' => 'Paris');
      $g->add_edge('London' => 'New York', label => 'Far');
      $g->add_edge('Paris' => 'London');

      print $g->as_png;

It outputs an aliased PNG.  SVG output (i.e., as_svg) is displayed--as you'd expect--with anti-aliasing.

--Aaron