| Layouting cyclic graphs with DirectedGraphLayout [message #234941] |
Fri, 01 June 2007 13:31  |
Eclipse User |
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Originally posted by: tupelo.arcor.de
This is a multi-part message in MIME format.
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Hi,
using DirectedGraphLayout for visualizing CFGs with cycles (iterations)
I encounter following problem:
as soon as a cycle occures the layout algorithm distorts the layout,
placing the end node higher than the other nodes though it should be
lower (see bad.gif). If I invert this looping edge the layout is great,
but the direction of this edge is wrong of course. Setting isFeedback on
this edge to true does deliver the wanted result (see good.gif) but this
access is deprecated.
So my question is, how to handle this problem? Is there a clean and
simple solution?
many thanks in advance,
tup
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| Re: Layouting cyclic graphs with DirectedGraphLayout [message #235172 is a reply to message #235124] |
Wed, 06 June 2007 11:07  |
| Eclipse User |
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Originally posted by: tupelo.arcor.de
Hi,
I'm using Node.setRowConstraint() in both examples and in both the left
to right order is as it should be, but my problem lies in the top->down
layout of nodes. So I'm not sure how the rowConstraint can fix this
problem since it only sets constraints on the left to right ordering of
the nodes, as far as I can see.
Thanks for answering,
regards,
tup
Anthony Hunter schrieb:
> Hi,
>
> If you are making use of org.eclipse.draw2d.graph.Node, check out
> Node.setRowConstraint().
>
> Cheers...
> Anthony
>
> "tupelo" <tupelo@arcor.de> wrote in message
> news:f3p6nk$mg5$1@build.eclipse.org...
>> Hi,
>>
>> using DirectedGraphLayout for visualizing CFGs with cycles (iterations)
>> I encounter following problem:
>> as soon as a cycle occures the layout algorithm distorts the layout,
>> placing the end node higher than the other nodes though it should be
>> lower (see bad.gif). If I invert this looping edge the layout is great,
>> but the direction of this edge is wrong of course. Setting isFeedback on
>> this edge to true does deliver the wanted result (see good.gif) but this
>> access is deprecated.
>> So my question is, how to handle this problem? Is there a clean and
>> simple solution?
>> many thanks in advance,
>> tup
>>
>
>
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| Re: Layouting cyclic graphs with DirectedGraphLayout [message #235443 is a reply to message #235172] |
Tue, 12 June 2007 14:58 |
| Eclipse User |
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Originally posted by: none.ibm.com
The algorithm is just using a greedy heuristic to find the "feedback arc
set". You must either remove the cycles before invoking the algorithm using
your own heuristic, or try to tune the algorithm using edge weights, which
will affect horizontal placement as well.
If you have time, you could try submitting a patch which allows the client
to provide the "break cycle" helper.
http://en.wikipedia.org/wiki/Feedback_arc_set
Heuristic used for compound graphs only:
http://www.google.com/patents?id=Co96AAAAEBAJ&printsec=d rawing&zoom=4&dq=inventor:+%22Thomas+Randall+Hudson% 22#PPP1,M1
"tupelo" <tupelo@arcor.de> wrote in message
news:f46468$tp1$1@build.eclipse.org...
> Hi,
>
> I'm using Node.setRowConstraint() in both examples and in both the left to
> right order is as it should be, but my problem lies in the top->down
> layout of nodes. So I'm not sure how the rowConstraint can fix this
> problem since it only sets constraints on the left to right ordering of
> the nodes, as far as I can see.
>
> Thanks for answering,
> regards,
> tup
>
>
> Anthony Hunter schrieb:
>> Hi,
>>
>> If you are making use of org.eclipse.draw2d.graph.Node, check out
>> Node.setRowConstraint().
>>
>> Cheers...
>> Anthony
>>
>> "tupelo" <tupelo@arcor.de> wrote in message
>> news:f3p6nk$mg5$1@build.eclipse.org...
>>> Hi,
>>>
>>> using DirectedGraphLayout for visualizing CFGs with cycles (iterations)
>>> I encounter following problem:
>>> as soon as a cycle occures the layout algorithm distorts the layout,
>>> placing the end node higher than the other nodes though it should be
>>> lower (see bad.gif). If I invert this looping edge the layout is great,
>>> but the direction of this edge is wrong of course. Setting isFeedback on
>>> this edge to true does deliver the wanted result (see good.gif) but this
>>> access is deprecated.
>>> So my question is, how to handle this problem? Is there a clean and
>>> simple solution?
>>> many thanks in advance,
>>> tup
>>>
>>
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