Re: [Pharo-users] Re: Call for action for Roassal - Moose-dev

24 Feb 2016

On Wed, Feb 24, 2016 at 11:03 AM, Martin Bähr <
mbaehr(a)email.archlab.tuwien.ac.at&gt; wrote:

...
  Excerpts from Peter Uhnák's message of 2016-02-24
10:35:05 +0100:
  In any case, I wrote a simpler layout delegator
in Roassal that delegates
 the layouting to graphviz and it works reasonably well, so I could  probably
  add it to Roassal (you however need graphviz
installed and it would add
 another dependency to Roassal, which I'm not so keen on). 
 how does that work? does it ask graphviz for the position of the nodes and
 then
 recreate that in roassal?

Yes, I generate .dot file that describes the nodes I want the layout for
(that includes the dimensions of it), and then the .dot file is passed to
GraphViz… from there I parse the generated SVG file (they can also output
other formats like txt, or xml) and move the Roassal nodes.

...

  Maybe also OGDF (http://ogdf.net/doku.php) could
be used if you are ok  with
  GPL… they have their own graph format so there
could be some interaction. 
 this would work the same as with graphviz as an additional dependency on
 ogdf, right?

GraphViz is good enough for generic graphs, but OGDF is well-founded and
much more powerful layouting library. However C++ coding is required if one
wants to use it.

Peter