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[Zest] Export Graph or GraphViewer [message #1105173]

Mon, 09 September 2013 13:09

Hans Wurst

Messages: 3
Registered: September 2013

Junior Member

Hi everybody,

in my application, i have a GraphViewer with a nested Graph that could be modified by the GUI (Nodes can be added and moved). Is it possible to export or save the complete Graph object into a file so that the user can import and visualize the Graph later in the same application?

Thanks a lot!

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Re: [Zest] Export Graph or GraphViewer [message #1105702 is a reply to message #1105173]

Tue, 10 September 2013 07:21

Zoltan Ujhelyi

Messages: 392
Registered: July 2015

Senior Member

Hi,

this approach is not supported directly by Zest. What you can do as a workaround is the following:

1. Traverse all nodes and connections manually, and save them (in any format of your choosing, you are writing the load/save code), including position and size information
2. Create a new layout algorithm, that utilizes this saved position information, and after loading the graph apply this algorithm. You can use also implement some fallback that in case of layout information is missing, apply another layout.

Hope, the idea is clear,
Zoltán

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Re: [Zest] Export Graph or GraphViewer [message #1106024 is a reply to message #1105173]

Tue, 10 September 2013 15:28

Fabian Steeg

Messages: 76
Registered: July 2009

Member

Hi,

two more suggestions:

- Not sure if this would work, but did you consider persisting the Graph object using Java Serialization?
- If the graph is simple, you could consider using the textual DOT representation supported in GEF4

Cheers,
Fabian

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Re: [Zest] Export Graph or GraphViewer [message #1112170 is a reply to message #1105173]

Thu, 19 September 2013 08:00

Hans Wurst

Messages: 3
Registered: September 2013

Junior Member

Hi,

thanks for your replies. I tried serialization, but i didn't work because the dependencies of graph objects to the framework are to deep.

I've implemented now a simple algorithm that saves only positions, size and other properties within a .xml file. That's enough for me;)

Regards

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