Re: [visad] Question on TupleTypes

• To: Bill Hibbard <hiding@xxxxxxxxx>
• Subject: Re: [visad] Question on TupleTypes
• From: Ugo Taddei <ugo.taddei@xxxxxxxxxxxxxxxxxx>
• Date: Tue, 19 Aug 2008 09:29:04 +0200

Hi Bill,

Bill Hibbard wrote:
>  How nice to hear from you, Ugo. Hope you are well.

I'm fine, thanks. And how are you doing?

> Your tutorial is still the starting point for VisAD
> documentation.

:-)

> 
> You can call setSamples() for a FlatField with range type:
> 
> ( (x,y) , temp, pressure, ...)
> 
> just as you would for a FlatField with range type:
> 
> ( x,y, temp, pressure, ...)
> 
> That is, setSamples(), getValues() and getFloats() all ignore
> any grouping of subsets of range RealTypes into "inner"
> RealTupleTypes.

But this ignores the topology of my data. X and y might be a line string
 or a polygon (like the region in Region.java).

Sorry, I've been some time away from VisAD. Fortunately there's a tutorial!

> 
> Cheers,
> Bill

Cheers,

Ugo
> 
>   ----- Original Message -----
>   From: "Ugo Taddei"
>   To: visad@xxxxxxxxxxxxxxxx
>   Subject: [visad] Question on TupleTypes
>   Date: Mon, 18 Aug 2008 21:23:55 +0200 (CEST)
> 
> 
>   Hello,
> 
>   I'm using VisAD to model database tables and have a question.
> 
>   Let a db table have an id, an x and an y coord, and a few other
>   fields
>   like temperature, pressure etc.
> 
>   I create a MathType like
> 
>   (id -> (x,y,temp,pressure,...)
> 
>   (that is RealType -> (RealTupleTypes)).
> 
>   Used a Linear1DSet as domain of a FlatField and got the points all
>   right
>   on the display. Here a snippet:
> 
>   TupleType range_tuple = ...;
> 
>   RealType index = RealType.getRealType( "id" );
>   FunctionType func_i_xy = new FunctionType( index, range_tuple );
> 
>   Set index_set = new Integer1DSet(index, count);
>   FlatField vals_ff = new FlatField( func_i_xy, index_set );
> 
>   vals_ff.setSamples( vals);
> 
>   Now I have another type of geometry, rather than single points, much
>   like
>   the 2D Set found in Region.java, which defines a polygon:
> 
>   int[][] tris = DelaunayCustom.fill(samples);
>   DelaunayCustom delaunay = new DelaunayCustom(samples, tris);
> 
>   Irregular2DSet region =
>   new Irregular2DSet(earth, samples, null, null, null, delaunay);
> 
>   which I also want to fill.
> 
>   So I changed the type to
> 
>   (id ->( (x,y) , temp, pressure, ...))
> 
>   (x,y) is a RealTupleType.SpatialCartesian2DTuple, whereas the other
>   fields
>   are RealTypes (defined by float[][]).
> 
>   To the question: what method setSample do I need? If that makes sense
>   at
>   all. Or do I have to wrap ((x,y),temp,pressure,...) in some
>   visad.Data
>   object?
> 
>   Thanks in advance,
> 
>   Cheers,
> 
>   Ugo
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>   visad@xxxxxxxxxxxxxxxx
>   For list information, to unsubscribe, visit:
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> 


-- 
Ugo Taddei

Fraunhofer Institut Intelligente Analyse- und Informationssysteme (FhG IAIS)
http://www.iais.fraunhofer.de
Department Knowledge Discovery - IAIS.KD -
Working Group Spatial Decision Support
http://www.iais.fraunhofer.de/kd.html
phone  (+49)2241-14-2184    fax    (+49)2241-14-2072
Schloss Birlinghoven, D-53754 Sankt Augustin, Germany

• References:
  • Re: [visad] Question on TupleTypes
    • From: Bill Hibbard