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| Re: Automatic Graph Layout that Honors Edge Labels? [message #206493 is a reply to message #206455] |
Mon, 02 January 2006 21:24   |
Eclipse User |
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Originally posted by: none.us.ibm.com
> (1) Allow graphs that have disconnected subgraphs. The source of the
> database schema article seems to have a workaround for that.
This will be supported in M5.
> (2) Automatic layout should treat edge labels as if they were nodes
> (obviously, without having the same freedom when it comes to moving them
> around).
That's a tough problem. You might be able to use node insets to guarantee
that space is preserved around a node for its labels, then place the labels
after DGL has finished.
> Any hints/pointers regarding (2) are greatly appreciated!
>
> Axel
>
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| Re: Automatic Graph Layout that Honors Edge Labels? [message #206520 is a reply to message #206493] |
Tue, 03 January 2006 01:59 |
 Axel Rauschmayer
Messages: 7
Registered: July 2009 |
Junior Member |
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Thanks for the answer!
> > (1) Allow graphs that have disconnected subgraphs. The source of the
> > database schema article seems to have a workaround for that.
>
> This will be supported in M5.
Great! Cycles, too? I am getting exceptions for graphs that have cycles.
This surprised me, because the JavaDoc does not say anything about it. My
knowledge of potential GEF applications is very limited, but it seems to
me that supporting cycles is important for most kinds of graphs and that
breaking cycles should be an extra operation rather than always be
performed.
> > (2) Automatic layout should treat edge labels as if they were nodes
> > (obviously, without having the same freedom when it comes to moving them
> > around).
>
> That's a tough problem. You might be able to use node insets to guarantee
> that space is preserved around a node for its labels, then place the labels
> after DGL has finished.
The problem is, the labels in my graph are at the mid-point between nodes.
Leaving more space at both sides of an edge should improve things, but is
obviously too broad a measure. I was also thinking along the lines of
making the mid-point label an extra node, for layouting's sake only. But
that gets me away from the currently really clean and simple solution I
have (which I like---being a total GEF newbie with not enough time for the
graphing part of my application). It is interesting to see how GEF and
GraphViz cater to different communities and how I'm right in the middle of
both: For me, either GEF with GraphViz's layouting abilities or GraphViz
with a GEF-like pure-Java engine would be perfect.
Axel
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