Linear2DSet Question

• To: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Subject: Linear2DSet Question
• From: Desiree Hilbring <hilbring@xxxxxxxxxxxxxxxxxxxx>
• Date: Mon, 2 Jul 2001 17:39:18 +0200 (MET DST)

Hi Bill and others,

sometime last year you helped me creating a Delaunay-Triangulation with
Visad and catching the Java3D-Shape3D.
In the meantime I used a similar way to construct a terrain out of a
Linear2DSet:



    public void makeSurface() {

        
        eastValues = RealType.getRealType("eastValues");
        northValues = RealType.getRealType("northValues");
        heightValues = RealType.getRealType("heightValues");
        
        try {
            domain_tuple = new RealTupleType(northValues,eastValues);
            // Create a FunctionType (domain_tuple -> range_tuple);
            func_en_h = new FunctionType(domain_tuple, heightValues);
            
            //System.out.println("nCols "+nCols);
            //System.out.println("nRows "+nRows);

//System.out.println(northMin+" "+northMax+" "+eastMin+" "+eastMax);
            domain_set = new
Linear2DSet(domain_tuple,northMin,northMax,nRows,eastMin, eastMax, nCols); 

            // Get the Set samples to facilitate the calculations
            float[][] set_samples = domain_set.getSamples( true );
            
            // We create another array, with the same number of elements
of
            // altitude and temperature, but organized as 
            // float[2][ number_of_samples ]        
            float[][] flat_samples = new float[1][nCols * nRows]; 
            
            // ...and then we fill our 'flat' array with the generated
values
            // by looping over NCOLS and NROWS     
            // specifiy height
            for(int c = 0; c < nCols; c++){
                for(int r = 0; r < nRows; r++){     
                    flat_samples[0][c*nRows+r] = height[c*nRows+r]; 
                }
            }
            
            // Create a FlatField  
            // Use FlatField(FunctionType type, Set domain_set)    
            vals_ff = new FlatField( func_en_h, domain_set);
            
            // ...and put the values above into it
            // Note the argument false, meaning that the array won't be
copied 
            vals_ff.setSamples( flat_samples , false ); 

            // Create Display and its maps    
            // A 2D display    
            display = new DisplayImplJ3D("display1");    
            
            // Create the ScalarMaps: latitude to XAxis, longitude to
YAxis and
            // altitude to RGB and temperature to IsoContour
            // Use ScalarMap(ScalarType scalar, DisplayRealType
display_scalar) 
            eastMap = new ScalarMap( eastValues, Display.YAxis );
            northMap = new ScalarMap( northValues, Display.XAxis );    
            heightMap = new ScalarMap(heightValues,Display.ZAxis);

            eastMap.setRange(-1.0, 1.0);
            northMap.setRange(-1.0, 1.0);
            heightMap.setRange(-1.0, 1.0);

            
            // Add maps to display
            display.addMap( eastMap );
            display.addMap( northMap );    
            display.addMap( heightMap );

            // Create a data reference and set the FlatField as our data 
            data_ref = new DataReferenceImpl("data_ref");
            data_ref.setData( vals_ff );
            renderer = new DefaultRendererJ3D();
            
            // Add reference to display
            display.addReferences(renderer,data_ref);
            //display.addReference( data_ref );
            display.addDisplayListener(listener);
        }
        catch (VisADException ve) {
            System.out.println("VisADException");
            System.out.println(ve.getMessage());
        }       
        catch (RemoteException re) {
            System.out.println("RemoteExcpetion");
            System.out.println(re.getMessage());
        }
    }

This is working for data samples with a rectangle layout.

. . . . .
. . . . .
. . . . .
. . . . .

My new kind of data samples is still a grid like structure, with the same 
space value between my coordinates, but it is not filled to an recangle.
It looks more like this:

        . .
      . . . 
        . . .
        . . . .
      . . . . . .
        . . . .
          . .

Is there a possibility to fill the not defined points with a kind of hole
value, or is it possible to create a not rectangle Linear2DSet? Or is
there another solution, I am not aware of?

Thanks for your help in advance.

Desiree

oooooooooooooooooooooooooooooooooooooooooooooooo
Desiree Hilbring

Institut fuer Photogrammetrie und Fernerkundung  
Universitaet Karlsruhe, Germany
email: hilbring@xxxxxxxxxxxxxxxxxxxx             
# 0721 6083676                                   
oooooooooooooooooooooooooooooooooooooooooooooooo


On Mon, 16 Oct 2000, Bill Hibbard wrote:

> Hi Desiree,
> 
> > I did manage to include the with VisAD created Delaunay Shape3D Object in
> > my application.
> 
> Great.
> 
> >   /**
> >      * Triangulation of given set of points with delaunay. This method
> >      * throws an event, when 3D-Objects are ready. See displayChanged.
> >      */
> >     public void makeSurface() {
> >         //System.out.println("Hallo Delaunay!");
> >         RealType x = RealType.getRealType("x");
> >         RealType y = RealType.getRealType("y");
> >         RealType height = RealType.getRealType("height");
> >         try {
> >             RealTupleType xy = new RealTupleType(x, y);
> >             FunctionType terrain_type = new FunctionType(xy, height);
> >             Irregular2DSet set = new Irregular2DSet(xy,new float[][]
> > {eastValues,northValues});
> >             FlatField terrain = new FlatField(terrain_type, set);
> >             terrain.setSamples(new float[][] {heightValues});
> > 
> >             display = new DisplayImplJ3D("display1");
> >             ScalarMap hoxmap = new ScalarMap(x, Display.XAxis);
> >             ScalarMap reymap = new ScalarMap(y, Display.YAxis);
> >             ScalarMap heightmap = new ScalarMap(height, Display.ZAxis);
> > 
> >             display.addMap(hoxmap);
> >             display.addMap(reymap);
> >             display.addMap(heightmap);
> > 
> >             hoxmap.setRange(-1.0, 1.0);
> >             reymap.setRange(-1.0, 1.0);
> >             heightmap.setRange(-1.0, 1.0);
> > 
> >             DataReferenceImpl data_ref = new
> > DataReferenceImpl("data_ref");
> >             data_ref.setData( terrain );
> >             renderer = new DefaultRendererJ3D();
> >             display.addReferences(renderer,data_ref);
> >             display.addDisplayListener(listener);
> >         }
> >         catch (VisADException ve) {
> >             System.out.println("VisAd TupleType Exception");
> >         }
> >         catch (RemoteException re) {
> >             System.out.println("RemoteExcpetion");
> >         }
> >         //System.out.println("Delaunay ende!");
> >     }
> > 
> > Is it possible with visad to get a shap3d of a part of this triangulation?
> > Say, I do have coordinates of a point and want to clip the parts of the
> > object, which are more far away, than 10m, or something similar?
> 
> Yes, if you want to clip in x, y and/or height.  Just add
> ScalarMaps from any of them to Display.SelectRange, then
> do something like:
> 
>   RangeControl control = (RangeControl) range_map.getControl();
>   control.setRange(low, hi); // set low and hi clip values
> 
> Note this is different from ScalarMap.setRange().  It should
> give you the part of the irregular syrface within the clip range(s).
> 
> Cheers,
> Bill
> ----------------------------------------------------------
> Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
> hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
> http://www.ssec.wisc.edu/~billh/vis.html
> 

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  • Re: Linear2DSet Question
    • From: From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>