| CompoundDirectedGraphLayout - with constrained nodes [message #136808] |
Mon, 07 June 2004 15:06  |
Eclipse User |
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Originally posted by: brianv.phreaker.net
Hi Guys,
My editor uses the CompoundDirectedGraphLayout to layout it's nodes.
However, unlike flow - I also allow my users to manually position the nodes.
I achieve this by running the CompoundDirectedGraphLayout algorithm in my
diagrams LayoutManager, but when I "apply" the results to the graph ( I
follow almost the same technique as the flow example) I check whether the
node has been maually positioned by the user - if it has, then instead of
placing according to the layout algorithm - I place it at the user
designated position.
I'm wondering now whether it is possible for me to modify the
CompoundDirectGraphLayout to take user positioned nodes into account while
it lays out the other nodes.
To be more clear - when CompoundDirectedGraphLayout is laying-out the nodes
it should be aware of the fact that some nodes are fixed and it should
therefore layout the other nodes assuming that certain nodes cannot be
moved.
I'm not too sure whether something like this would fit within the
artchitecture of CompoundDirectedGraphLayout, and I don't think it's going
to be trivial.
Could you point me in the right direction ? Can I grow from
CompoundDirectedGraphLayout or would it be better to use another layout
algorithm altogether?
Any suggestions, pointers appreciated,
Thanks,
Brian.
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| Re: CompoundDirectedGraphLayout - with constrained nodes [message #136898 is a reply to message #136873] |
Mon, 07 June 2004 17:19  |
| Eclipse User |
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Originally posted by: none.us.ibm.com
I don't see how absolute positioning could work. The hard part would be
determining which row or rows the node really occupies. Sizing is already
supported. Just set the Node or Subgraph's width/height fields prior to
invoking the layout.
I have future plans to play with such a layout where the user can reorder
the nodes, and possible determine how many rows a node should span.
"Brian Fernandes" <brianv@phreaker.net> wrote in message
news:ca2hg0$pn6$1@eclipse.org...
> Hi Randy,
> Good to hear that some work is already done in that direction.
>
> >Is this relative ordering what you are looking for? Or do you want
> absolute
> >ositioning of a node?
>
> Unfortunately I need absolute positioning - relative ordering will not do.
> Beyond positions, the user may also resize his node to any dimensions. It
> would be cool if dimensions could be taken into account was well.
>
> Whatever you have mentioned so far points to relative ordering - what is
> your position on absolute positioning - any work done here at all ? & do
you
> think it will be possible to integrate this into
> CompoundDirectedGraphLayout's architecture ?
>
> Thanks for the heads up,
> Brian.
>
>
>
>
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