Hi Bill,
I meant,
float theColor=3.0f*(float)Math.random();
java.util.Arrays.fill(colors[0],j*4,(j+1)*4-1,theColor);
behaves differently from:
float theColor=3.0f*(float)Math.random();
for (int i = j*4; i < (j+1)*4; i++) colors[0][i]=theColor;
Cheers,
Ricardo
Ricardo Mantilla wrote:
Hi Bill,
I wanted to close this thread letting you know that I found that the
strategy that you suggested of creating the FlatField was correct from
the beginning.
For some reason the line of code:
float theColor=3.0f*(float)Math.random();
java.util.Arrays.fill(colors[0],j*4,(j+1)*4-1,2.0f);
behaves differently from:
float theColor=3.0f*(float)Math.random();
for (int i = j*4; i < (j+1)*4; i++) colors[0][i]=theColor;
in a loop of j. This was causing the colors array to end up with some
0's.
This is probably a Java1.5 on Mac OS X issue, completely unrelated to
VisAD.
Cheers,
Ricardo
Bill Hibbard wrote:
Hi Ricardo,
To get solid color triangles, all vertices of a triangle must have the
same color. To achieve this, it may be necessary that each
Irregular2Dset in the UnionSet consist of a single triangle (so that
no triangles share any vertices).
Good luck,
Bill
----- Original Message -----
From: "Ricardo Mantilla"
To: "Bill Hibbard"
Subject: Re: filled triangles
Date: Thu, 08 Mar 2007 21:54:41 -0700
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
>
>
> --
>
-- -------------------------------------------------------------
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/
-------------------------------------------------------------
<< triangles2.png >>
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--
-------------------------------------------------------------
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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