ViewerPump and visualization questions

["Gergely Zahoransky-Kohalmi" <gzahoransky-kohalmi AT salud.unm.edu>]

First, Happy New Year for you All!


I have an easier and a more complicated question for you, I hope you can help 
me out on these issues.


For reference, I'm using the 1.2 version of GS.


1. The easy one: If I display the graph with the graph.display() method all 
the things defined in the css file are showing up nicely. On the other hand, 
if I define a custom view (following directions in your tutorial), the some 
things are just not working. Such things: if I use pi-charts as edge sprites, 
then there's always only one color (there are multiple colors when using the 
default graph.display() method). I'm using the "angle" edge type (ref: 
http://graphstream-project.org/media/data/css/edge_shape2.css), but it is not 
showing up on my view, only in the case of calling graph.dipslay(). I include 
this line in the main method according to your directions: 
System.setProperty("org.graphstream.ui.renderer", 
"org.graphstream.ui.j2dviewer.J2DGraphRenderer");
I've found a workaround, though. If I start my code with the 
-Dgs.ui.renderer=org.graphstream.ui.j2dviewer.J2DGraphRenderer switch 
(following your tutorial), then things look just the way I want with my 
custom view (pi charts are multi-colored).
I'd like to solve this inside the code, but so far I could not achieve it. On 
a side note, there's a warning message when starting the program with the 
switch:


<<"gs.ui.renderer" is deprecated,use "org.graphstream.ui.renderer" instead">> 
, so you might want to change that in the tutorial to: 
-Dorg.graphstream.ui.renderer=org.graphstream.ui.j2dviewer.J2DGraphRenderer .








2. The more complicated question:


I managed to create a gui app where I can create a graph, select a node with 
right-click, and the do things with the set of selected nodes. If I enable 
the auto layout on the viewer, then clicking again on one of the nodes, I got 
the following error message:


"Exception in thread "AWT-EventQueue-0" 
org.graphstream.graph.IdAlreadyInUseException: singleton exception: id "3629" 
already in use. Cannot create a node."


I am not sure why a simple click on the graph view wants to create a node, I 
did not implement anything like that. I also tried to move around the part of 
 the code which is responsible for setting up the ViewerPipe, no success. (I 
thought I might need to set the ViewerPipe before actually adding nodes to 
the graph by the graph.addNode() method).


The scheme of my interactive gui is as follows:




1. In the main thread, I initiate a Viewer as:  viewer = new Viewer(graph, 
Viewer.ThreadingModel.GRAPH_IN_ANOTHER_THREAD);
2. I add a view by addDefaultView


3. I create a ViewPipe, and plug that in into a custom mouse manager so that 
the pump() method is only called when some node is clicked.


4. I visualize the view as follows (code from the main thread, i.e. main 
method):


EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MyGraph window = new MyGraph();
window.frame.setVisible(true);


window.frame.add(view);





} catch (Exception e) {
e.printStackTrace();
}
}
});


For the record, I don't take advantage on the methods of ViewerListener, as 
it only deals with basic things (no distinction between node clicks, 
selection, right and left clicks).






Any help would be greatly appreciated!






Thanks,


Gergely