jgrapht-users

[jgrapht-users] jgraph question

[Alex M. <am...@di...>]

Hey All,

 

So I tried downloading the latest jgraph from jgraph.com.  All I seem to be
getting is some mxgraph stuff, even in the jar file called jgraph.jar.  I am
trying to compile my version of the JGraphAdapterDemo using the latest
jgraphx.jar from that website but it can't find some of the basic files like
JGraph.class which I also don't see in the jar file.  Is the
JGraphAdapterDemo just out of date and uses an old version of JGraph?

 

Thanks,

Alex

Re: [jgrapht-users] jgraph question

[Philip A G. II <pg...@da...>]

Alex,

 

The JGraph adapter and the associated demo are for a previous version of
JGraph.  If you use the jgraph jar file that is in the lib directory of the
jgrapht distro, you can make the demo work.

 

The current version of JGraph was re-written to align with the JavaScript
version, and repackaged as mxGraph (because that's what the JavaScript API
is called).  The API is completely different and the adapter won't work with
it - and there's not an easy path to make it work.

 

I did find a very simple adapter that someone wrote that works one-way with
the mxGraph API, but it's incomplete and needs some work.  You can find it
here:

 

http://forum.jgraph.com/questions/133/using-jgraphx-to-visualize-jgrapht

 

Hope this helps,

Phil

 

From: Alex Moir [mailto:am...@di...] 
Sent: Friday, October 19, 2012 7:25 PM
To: jgr...@li...
Subject: [jgrapht-users] jgraph question

 

Hey All,

 

So I tried downloading the latest jgraph from jgraph.com.  All I seem to be
getting is some mxgraph stuff, even in the jar file called jgraph.jar.  I am
trying to compile my version of the JGraphAdapterDemo using the latest
jgraphx.jar from that website but it can't find some of the basic files like
JGraph.class which I also don't see in the jar file.  Is the
JGraphAdapterDemo just out of date and uses an old version of JGraph?

 

Thanks,

Alex

Re: [jgrapht-users] jgraph question

[Alex M. <am...@di...>]

Thanks for the link.  I am able to run the given JGraphXAdapter code
successfully, but when I try to integrate it in my own code I get a blank
screen.  Maybe it's because of the cell location stuff.  In that link
somebody said "The most trickey for me was having to set-up the cell
location and dimension, before applying layouts."  I'm not sure what that
means, but I have a feeling I am having the same problem.  When I try to
apply my own layout by modifying the JGraphXAdapter, I added the following
code in the main() method:

      mxIGraphLayout layout = new mxFastOrganicLayout( graph );

      // layout using morphing
      graph.getModel().beginUpdate();
      try
      {
         layout.execute( graph.getDefaultParent() );
      }
      finally
      {
         mxMorphing morph = new mxMorphing( graphComponent, 20, 1.2, 20 );

         morph.addListener( mxEvent.DONE, new mxIEventListener()
         {
            @Override
            public void invoke( Object arg0, mxEventObject arg1 )
            {
               graph.getModel().endUpdate();
               // fitViewport();
            }
         } );

         morph.startAnimation();
      }

But I got this exception:
Exception in thread "main" java.lang.NullPointerException
	at com.mxgraph.layout.mxGraphLayout.getVertexBounds(Unknown Source)
	at com.mxgraph.layout.mxFastOrganicLayout.execute(Unknown Source)
	at com.dii.fuzzy.gui.JGraphXAdapter.main(JGraphXAdapter.java:243)

Then I tried this code instead to do the layout and got the exact same
exception.

      mxFastOrganicLayout layout = new mxFastOrganicLayout( graph );

      // set some properties
      
      layout.setForceConstant( 40 ); // the higher, the more separated
      layout.setDisableEdgeStyle( false ); // true transforms the edges and
makes them direct lines

      // layout graph
      layout.execute( graph.getDefaultParent() );

Does anyone have an idea on how to avoid this exception when trying to
layout the graph?  Is it because I don't have the right cell location or
dimensions like that person posted?

Thanks,
Alex