[Jung-support] [jung - Open Discussion] RE: Vertex Colour Change Doesn't Persist

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By: nobody

Thanks for the reply.  The problem fixed itself after I installed a right-click
popup menu and set the DefaultModalGraphMouse.setMode(Mode) method.

I'm glad you brought up the typecasting.  I'm fairly new to Java and perhaps
you can tell me the correct way to handle such situations.  First let me explain
what I'm trying to do.

I have 3 custom vertex types that extend UndirectedSparseVertex:

The hierarchy looks like this:

UndirectedSparseVertex
..........|
..........|
.......MonitorVertex
.......|..........|
.......|..........|
..ClientVertex...BrokerVertex

Now I believe the fragile code you're referring to is this line:

 MonitorVertex v1 = (MonitorVertex) v; 

The reason for my downcast is that getDrawPaint and getFillPaint both have arguments
of type Vertex.  However, a requirement I have is that ClientVertex objects
and BrokerVertex objects be displayed in different colours. BrokerVertex should
be further colour-coded if it is active or not (determined using isActive()).
The problem here is that the logic within getDrawPaint and getFillPaint depend
on information available through my custom vertex objects -- information which
is not contained in the standard Vertex class which is passed in to the methods.

What is the correct way to handle this situation?  A Vertex object is passed
into getDrawPaint and getFillPaint, but my logic depends on info contained in
ClientVertex and BrokerVertex (accessed through MonitorVertex).

I appreciate the help.

Thanks,
NT


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