Re: How to use GraphicGraph

[guilhelm savin <guilhelm.savin AT gmail.com>]

|

| Graph g = ... ;

| Viewer v = g.display(false);

| ProxyPipe proxy = v.newThreadProxyOnGraphicGraph();

| proxy.addAttributeSink(g);

|

| proxy.pump();

| Steiner s = new Steiner();

| s.init(g);

| s.compute();

|

2011/8/2 Stefan Balev <stefan.balev AT gmail.com>

Hello,

I have an application that dynamically recomputes the coordinates of the nodes of a graph :

Graph g = ...
g.display(false);
new Steiner(g).compute();

At the beginning I naively thought that when the user drags a node in the viewer, this will change the "xyz" attribute of the node in g. Then I realized that dragging a node actually changes the "xyz" attribute of the node in the GraphicGraph associated to the viewer. In order to have the coordinate changes back to g I tried something like this:

Graph g = ...
g.display(false).getGraphicGraph().addSink(g);
new Steiner(g).compute();

Now almost everything works fine, but sometimes I have random exceptions like this:

Exception in thread "AWT-EventQueue-0" java.util.NoSuchElementException
at java.util.LinkedList.remove(LinkedList.java:788)
at java.util.LinkedList.removeFirst(LinkedList.java:134)
at java.util.LinkedList.remove(LinkedList.java:481)
at org.graphstream.stream.SourceBase.manageEvents(SourceBase.java:837)
[ ... stack trace too long to paste it entirely ... ]
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Is it because of the "Caution : Use the returned graph only in the Swing thread !!" warning that we can read in Javadoc of getGraphicGraph()? If yes, what is the easiest proper way to do what I am trying to? Thanks for your help.

Btw, everything works great when I use FileSinkImages. Here is a small video showing this.

Best,

--
Stefan

--
Guilhelm Savin
PhD Student of Computer Science

LITIS, University of Le Havre
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