filled triangles

[Ricardo Mantilla]

Hi Bill,

Thanks for your suggestion, however I am getting a some color gradients 
on my graph (attached) rather than flat colors inside the triangles.  It 
may be due to how I am setting up the FlatField.  In the code that 
follows "regions" is an Irregular2DSet[] array, and "colors" is a 
float[] array with as many positions as points in all the Irregular2DSet.

CODE FOLLOWS +++++++++++++++++++

RealType xEasting =RealType.getRealType("xEasting"),
         yNorthing=RealType.getRealType("yNorthing"),
         tileColor=RealType.getRealType("tileColor");
  
RealTupleType domainXLYL=new RealTupleType(new RealType[] 
{xEasting,yNorthing});

FunctionType func_xEasting_yNorthing_to_Color=new 
FunctionType(domainXLYL,tileColor);

UnionSet allRegions=new UnionSet(domainXLYL,regions);

FlatField theColors=new 
FlatField(func_xEasting_yNorthing_to_Color,allRegions);
theColors.setSamples(colors);

DataReference region_ref = new DataReferenceImpl("region");
region_ref.setData(theColors);

display_TIN.addReference(region_ref);

CODE ENDS +++++++++++++++++++

What am I doing wrong?

Thanks,
 Ricardo



Bill Hibbard wrote:
> Hi Ricardo,
>
>     I am using VisAD to display a bunch of filled triangles (as shown
>     in attachment). Since each triangle is supposed to be a different
>     color my approach was to create an irregular2DSet for each one
>     (using Delaunay.fill()) and then create a reference for each one
>     with an associated constant map (describing Red, Green, Blue).
>
>     However, this is awfully slow when I have hundreds of triangles. I
>     was looking for something like creating an unionSet with the
>     irregular2DSets with each irregular2DSet having a property
>     associated to the color but I couldn't find a way to to it.
>
>
> Construct a FlatField with MathType ((x, y) -> (r, g, b)) and use the
> UnionSet as the domain Set of the FlatField. Then you have ScalarMaps
> of the Field range values to Red, Green and Blue, and fill the triangle
> vertex colors into those range values.
>
> Good luck,
> Bill
>
>
> -- 
>
> <http://a8-asy.a8ww.net/a8-ads/adftrclick?redirectid=en-mail_a_01>
>

-- 
-------------------------------------------------------------
Ricardo Mantilla
Posdoctoral Research Associate

Department of Earth and Environmental Science
New Mexico Institute of Mining and Technology
801 Leroy Pl. MSEC 254
Socorro, NM 87801

Phone: (505) 835-5068
Office: MSEC 254
http://cires.colorado.edu/~ricardo/
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