Hi Ricardo,
java.util.Arrays.fill(colors[0],j*4,(j+1)*4-1,theColor);
behaves differently from:
for (int i = j*4; i < (j+1)*4; i++) colors[0][i]=theColor;
The toIndex value of Arrays.fill -- (j+1)*4-1 -- is excluded from the
fill. To get the same behavior, use:
java.util.Arrays.fill(colors[0],j*4,(j+1)*4,theColor);
-Curtis
On 3/9/07, Ricardo Mantilla <ricardo@xxxxxxxxxxxxxxxxxx> wrote:
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 >>
>>
>>
>> --
>>
>> <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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