Re: [igraph] Better layout output in igraph

[Tamas Nepusz]

Hi,

Sorry, not yet, haven't had time -- probably around the middle of next week.

Cheers,
T.

On 08/19/2011 01:48 PM, Håvard Wahl Kongsgård wrote:
> Hi, have you now added support for curved edges to the trunk?
> 
> -Håvard
> 
> On Wed, Aug 10, 2011 at 12:50 PM, Tamas Nepusz <address@hidden> wrote:
>>
>>> Error: Exceeded density grid with x_grid = 491 and y_grid =
>>> 2147483638.  Program stopped.
>> This error message is from the DrL layout algorithm. DrL is a third-party
>> layout algorithm that has been integrated into igraph, and it was originally
>> distributed as a standalone application, so there are places where it simply
>> aborts the application instead of returning an error code. If you have a
>> graph with which this bug is reproducible in a deterministic manner, please
>> send it to me so I can check what's wrong with it and why the DrL algorithm
>> fails. Any other layout algorithm works fine as you already noted it in your
>> other email.
>>
>>>> curvature of the edge. The Python interface in 0.6 will support custom edge
>>>> drawer classes, so you would be able to plug in your own edge drawer there.
>>> Is this function available in the trunk?
>> The custon edge drawer functionality is available, but there is no edge
>> drawer yet which supports curved edges. You can check the source code of
>> igraph.drawing.edge.ArrowEdgeDrawer and .AbstractEdgeDrawer to get a rough
>> idea of how it works. If you need curved edges, you can implement it as a
>> subclass of ArrowEdgeDrawer or AbstractEdgeDrawer. Custom edge drawers in
>> igraph 0.6 can be used like this:
>>
>> from igraph.drawing.edge import TaperedEdgeDrawer
>> from igraph.drawing.edge import DefaultGraphDrawer
>>
>> def my_graph_drawer_factory(*args, **kwds):
>>    kwds["edge_drawer_factory"] = TaperedEdgeDrawer
>>    return DefaultGraphDrawer(*args, **kwds)
>>
>> plot(graph, drawer_factory=my_graph_drawer_factory)
>>
>> The above code will give you tapered edges in directed networks where each
>> edge is essentially a narrow triangle pointing towards its target. Make sure
>> you have the latest revision as the drawer_factory=... keyword argument has
>> just been added to the supported keyword arguments of Graph.__plot__.
>>
>> In the long run, I plan to add the curved edge functionality to
>> ArrowEdgeDrawer, similarly to the way it works with the R interface of
>> igraph. Actually, I plan to do it this week, so if this is not urgent, it
>> might be easier for you to wait a bit.
>>
>> Cheers,
>> Tamas
>>
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