Graphviz anti-aliased output?

RT Users
1

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?

BTW, the Graphviz integration is super-cool.

–Aaron Hathaway

2

“Aaron Hathaway” aaron.hathaway@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?

3

Message: 2 Date: Sun, 24 Aug 2008 16:54:30 +1000 From:
trentbuck@gmail.com (Trent W. Buck) Subject: Re: [rt-users] Graphviz
anti-aliased output? To: rt-users@lists.fsck.com Message-ID:
30bpzikimx.fsf@Clio.twb.ath.cx Content-Type: text/plain;
charset=us-ascii “Aaron Hathaway” aaron.hathaway@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.

–Aaron

4

Message: 2
Date: Sun, 24 Aug 2008 16:54:30 +1000
From: trentbuck@gmail.com (Trent W. Buck)
Subject: Re: [rt-users] Graphviz anti-aliased output?
To: rt-users@lists.fsck.com
Message-ID: 30bpzikimx.fsf@Clio.twb.ath.cx
Content-Type: text/plain; charset=us-ascii

“Aaron Hathaway” aaron.hathaway@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.

–Aaron

The rt-users Archives

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Commercial support: sales@bestpractical.com

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Buy a copy at http://rtbook.bestpractical.com

Best regards, Ruslan.

5

-----Original Message-----
From: ruslan.zakirov@gmail.com [mailto:ruslan.zakirov@gmail.com] On Behalf Of
Ruslan Zakirov
Sent: Sunday, August 24, 2008 11:25 PM
To: Aaron Hathaway
Cc: rt-users@lists.bestpractical.com
Subject: Re: [rt-users] Graphviz anti-aliased output?

Message: 2
Date: Sun, 24 Aug 2008 16:54:30 +1000
From: trentbuck@gmail.com (Trent W. Buck)
Subject: Re: [rt-users] Graphviz anti-aliased output?
To: rt-users@lists.fsck.com
Message-ID: 30bpzikimx.fsf@Clio.twb.ath.cx
Content-Type: text/plain; charset=us-ascii

“Aaron Hathaway” aaron.hathaway@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

6

It’s not a limitation of the module. Try “print $graph->as_text” and
you’ll see that it’s has nothing specific that turn of anti-aliasing.

Tested with sample from the module using:
t.pl > res.png
t_with_as_text.pl | dot -Tpng > res_via_dot.png

Both images are anti-aliased.On Mon, Aug 25, 2008 at 10:25 PM, Aaron Hathaway aaron.hathaway@prager.com wrote:

-----Original Message-----
From: ruslan.zakirov@gmail.com [mailto:ruslan.zakirov@gmail.com] On Behalf Of
Ruslan Zakirov
Sent: Sunday, August 24, 2008 11:25 PM
To: Aaron Hathaway
Cc: rt-users@lists.bestpractical.com
Subject: Re: [rt-users] Graphviz anti-aliased output?

On Mon, Aug 25, 2008 at 8:56 AM, Aaron Hathaway aaron.hathaway@prager.com wrote:

Message: 2
Date: Sun, 24 Aug 2008 16:54:30 +1000
From: trentbuck@gmail.com (Trent W. Buck)
Subject: Re: [rt-users] Graphviz anti-aliased output?
To: rt-users@lists.fsck.com
Message-ID: 30bpzikimx.fsf@Clio.twb.ath.cx
Content-Type: text/plain; charset=us-ascii

“Aaron Hathaway” aaron.hathaway@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

The rt-users Archives

Community help: http://wiki.bestpractical.com
Commercial support: sales@bestpractical.com

Discover RT’s hidden secrets with RT Essentials from O’Reilly Media.
Buy a copy at http://rtbook.bestpractical.com

Best regards, Ruslan.