Contouring and Flow vector access

[Edward Stanford <stanford@xxxxxxx>]

Hello, everyone,

	I need to use VisAD to generate contours and flow maps of a dataset, and 
then import those contours into a GIS application.  To do this, it would be 
extremely convenient to be able to get the list of vector points describing 
the contours.  My other alternative is to create a display, plot the 
contours, extract a bitmap, set the bitmap background to something 
transparent, and import the result into my GIS application.  This seems 
awkward at best.

	Looking at the javadoc, I didn't see any obvious accessors.  Looking at 
the source code, I found a static method contour( long parameter list ) in 
Contour2D.java which ignores all the type safety restrictions of the VisAD 
data model, but which otherwise appears to give me what I need.  Still, I 
can't help but think that there must be a better way, especially since this 
doesn't extend to flows anyway.

	I'm perfectly happy to extend the source code myself, if the necessary 
accessors don't exist, but I sure would appreciate any pointers anyone can 
give me as to where/how contours and flows are calculated for a 
display.  greps for contour and flow in the source tree didn't flash any 
obvious neon signs.

        Edward