Re: ShapeSet

• To: Doug Lindholm <lind@xxxxxxxx>
• Subject: Re: ShapeSet
• From: Don Murray <dmurray@xxxxxxxxxxxxxxxx>
• Date: Tue, 04 Sep 2001 13:07:31 -0600

Hi Doug-

I can't answer all your questions, but:

Doug Lindholm wrote:

> Is there a case where it makes sense to use anything other than an
> Integer1DSet for the ShapeSet? It's an extra level of complexity in an
> already complex API for making shapes.

Here's something Bill sent to me a while back when I was trying
to figure out how to do station model plots:

>Shouldn't need a custom DataRenderer.  If your data have MathType:
>
>  (index -> (lat, lon, t, td, wx, ...))
>
>you'd map:
>
>  lat -> YAxis
>  lon -> XAxis
>  t -> Shape
>  td -> Shape
>  wx -> Shape
>  . . .
>
>In the ShapeControl for t and td, you'd set the quantization of
>t and td values in the setShapeSet(set) where set might be
>Linear1DSet(t, -100.0, 100.0, 2001) for 0.1 degree resolution,
>and you'd use PlotText.render_label() to create the VisADLineArrays
>for each 0.1 degree from -100.0 to 100.0, all passed to setShapes()
>(see Test47.java for an example).  You might add slight offsets to
>the 'double[] start' locations for t and td, to get them offset
>from the center of the station plot.  The station plot center
>position will be determined by the lat and lon mappings.
>
>For wx you'd have some numerical codes for each weather symbol,
>and put the symbols in VisADLineArrays passed to wx's setShape().
>I think Tom may have started this a long time ago.
(He hasn't, but he's thinking about it)

I'm not sure what you are trying to do with the Field, but
I think the idea is that each parameter has it's own ShapeControl
and the VisADGeometryArrays are defined for each parameter.
For numbers, it's easy, for symbols there should be a static
factory for them (cloud cover, weather, barometric tendency, etc).

I agree that the Shape model is complex, but it is also 
very powerful (kinda like the rest of VisAD ;-)).  It just
takes a little while to "get your mind right".

Hope this helps.

Don
*************************************************************
Don Murray                               UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************

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