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List:       graphviz-interest
Subject:    Re: [graphviz-interest] automatic layout for Grappa
From:       Jan Sanders <jan () rvs ! uni-bielefeld ! de>
Date:       2010-07-21 10:56:15
Message-ID: 4C46D24F.7040900 () rvs ! uni-bielefeld ! de
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Hi Jean,

junghee@cs.umass.edu wrote:
> Hi Jan Sanders,
>
> Thank you for your response! Can I ask two questions?
Of course.
>
> First, as far as I know Grappa does not support generating the image 
> file (e.g. bmp), right?
That is true.
> (Is it hard work to implement such functionality?)
No. Just use java.lang.Runtime.exec to execute

dot -T<format> -o outfile

then use the java.lang.Process object created by the exec call to feed 
your att.grappa.Graph to the dot process. The result file will be where 
you specified it using "-o outfile"

Small example.
// use your Graph object for this
Graph g = getGraphFromSomewhere(); 

// Get a Runtime object so that you can execute commands
Runtime r = Runtime.getRuntime();

// Execute dot and specify the target output file, type of output and 
everything that you could as if
// you were calling dot from the command line.
Process p = Runtime.exec("/usr/bin/dot -Tpng -o /home/user/output.png");

// Feed the Graph data to the dot process
// this will write the Graph data to stdin of the dot process
g.printGraph(p.getOutputStream);

// don't forget to flush. ;-)
p.getOutputStream().flush();

>
> Second, could you please let me know how I can set the compile option 
> you mentioned, like "dot -o layouted-graph.dot graph.dot"? FYI, 
> currently I am using the eclipse.
The exec call is stated as a String. No IDE specifics here. As for the 
dot specific flags see http://www.graphviz.org/Documentation.php

Mind, that the command string used in Runtime.exec is not platform 
independent.

Hope I could help.

Jan Sanders


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