Shape question

• To: visad-list@xxxxxxxxxxxxx
• Subject: Shape question
• From: Don Murray <dmurray@xxxxxxxxxxxxxxxx>
• Date: Fri, 10 Aug 2001 15:52:20 -0600

Hi-

I'm starting to look into using Shapes for station plots, etc.
Doug Lindholm has given me some code snippets that help, but
I need some help beyond that.  I figured I'd ask for help from
the group instead of just bothering Doug. ;-)

Let's say I have a two VisADLineArrays that represents a plus 
sign (+) and a minus sign (-). I create a VisADGeometryArray[]
array of {plus, minus}. I get a slug of lightning 
observations in a FieldImpl with type (index -> (lat, lon, signal)).
I modify this to be a new field (index -> (lat, lon, shape)).  The
values for shape will depend on whether signal is positive or 
negative and be set to 0 or 1 as the index into the
VisADGeometryArray[]. I set up the ScalarMap(shape, Display.Shape), 
set the ShapeSet as an Integer1DSet from 0,1, and set the Shape
in the shapeControl to be the array of two items.  This all works
fine.

What I'd like to do next is to color code the shapes based on
the strength of the signal, or maybe on some other basis (ex: grey
out older lightning flashes).  Should I create a VisADGeometryArray[]
that has the same length as my FieldImpl and have each element be
a clone of the plus or minus, with the appropriate color set in
each one?  What are the overhead (memory usage) issues related
to this?

Thanks for your help.

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
*************************************************************

• Follow-Ups:
  • Re: Shape question
    • From: Doug Lindholm
  • Re: Shape question
    • From: From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>