Re: Questions about RMI

[Stefan Balev <stefan.balev AT gmail.com>]

Hi Nuno,
The layout algorithm uses a special object of type GraphicGraph which
is a sort of copy of your original graph. It changes the "xyz"
attributes of this object. I am not yet quite sure why it does not
provide a coordinate feedback, this should be either unimplemented
feature or a bug. While waiting for a fix, you have two possible
workarounds.
1. Get a reference to the GraphicGraph and use it instead of the original 
graph:
Viewer v = g.display();Graph gg = v.getGraphicGraph();
2. A better solution is perhaps to get the coordinate changes back to
your original graph. To see how this works, please take a look on this
thread:http://sympa.litislab.fr/sympa/arc/graphstream-users/2011-08/msg00000.html
Hope this helps,
--Stefan

2011/10/25  
<Nuno.Carvalho AT uk.fujitsu.com>:
> Hi Yoann, all,
>
> Yes, that worked very well, thanks!
>
> Now I have another issue. I'm doing some tests on a small example, without 
> using RMI.
>
> I'm creating nodes and letting the toolkit position them freely. But then, 
> I want to retrieve their position to (for instance) change the view center 
> to a specific node and zoom on it. But I can't retrieve their x,y position.
>
> I tried the Toolkit.nodePosition(node) and node.getNumber("x"), etc, 
> everything gives me a null, or NaN or 0.0.
> I read somewhere that I need to enable the feedback on these variables, so 
> I tried calling Viewer.enableXYZfeedback(true) on the viewer returned by 
> graph.display() and still nothing.
>
> Can someone help me?
>
> Thanks and kind regards,
> Nuno
>
> -----Original Message-----
> From: Yoann Pigné 
> [mailto:yoann.pigne AT gmail.com]
> Sent: 20 October 2011 15:28
> To: 
> graphstream-users AT litislab.fr
> Subject: Re: Questions about RMI
>
> Hi Numo,
>
>
> In the documentation, the "Generator" part is just an example. Actually the 
> RMISink only waits for a source to register on it. A Graph is a source too, 
> so you can replace the "generator" part with your graph.
>
> From the example on the documentation :
>
> Generator gen = new XXXGenerator();
> gen.addSink(sink);
>
> can become:
>
> Graph g = new DefaultGraph("My graph");
> g.addSink(sink);
>
> and then you can use the  addNode/Edge methods you are used to :
>
> g.addNode("node1");
> g.addNode("node2");
> g.addEdge("edge1", "node1","node2");
>
> Hope It will help you,
>
> Let us know,
>
> Yoann
>
>
> On Oct 20, 2011, at 3:55 PM, 
> <Nuno.Carvalho AT uk.fujitsu.com>
>  wrote:
>
>> Dear all,
>>
>> I'm just started using GraphStream and I must say that this is a very 
>> powerful tool.
>> Now I want to use it with the RMI functionality. I want to implement the 
>> following scenario:
>>
>> -          Process A is generating Nodes and Edges for the Graph
>> -          Process B is just getting the new nodes and edges and 
>> displaying it on the screen.
>>
>> For that, I've been trying to follow this tutorial:
>> http://graphstream-project.org/doc/Tutorials/Using-remote-source_1.0/
>>
>> So, before I had something like this:
>>
>> Graph graph = new SingleGraph("g");
>> graph.display();
>> graph.addNode(...);
>> graph.addEdge(...);
>> // and so on...
>>
>> Now I have this code split in two parts:
>>
>> On one side, I have the part that displays the graph on the screen, which 
>> is very simple:
>> RMISource source = new RMISource();
>> Graph graph = new DefaultGraph("g");
>> source.addSink(graph);
>> graph.display();
>>
>>
>> On the other process, I must have an RMISink where I push the new nodes 
>> and edges, right?
>> So, I must have the following:
>> RMISink sink = new RMISink();
>> Sink.register(...);
>>
>> Then, according to the Tutorial, I have to create a Generator, connect it 
>> to the Sink and start loop on the generator.nextEvents();
>>
>> The questions that I have are the following:
>> -          The generator must be implemented by myself, based on my graph 
>> data source, or I can use some already implemented Generator with a 
>> interface similar to what I have for graphs(addNode, addEdge, etc)?
>> -          If I need to implement my own generator, how should I do it? Is 
>> there any tutorial to do this? I'm missing this part: how to add nodes and 
>> edges, and push it to the RMISink...
>>
>> All help will be much appreciated!
>>
>> Thanks and kind regards,
>> Nuno
>>
>>
>>
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> ______________________________________________________________________
>
>  Fujitsu Laboratories of Europe Limited
>  Hayes Park Central, Hayes End Road, Hayes, Middlesex, UB4 8FE
>  Registered No. 4153469
>
>  This e-mail and any attachments are for the sole use of addressee(s) and
>  may contain information which is privileged and confidential. Unauthorised
>  use or copying for disclosure is strictly prohibited. The fact that this
>  e-mail has been scanned by Trendmicro Interscan does not guarantee that
>  it has not been intercepted or amended nor that it is virus-free.
>
>