Rendering SingletonSet as Ellipse/Circle (was Rivers)

// TestStormSingeltonSet
package visad;

// import needed classes
import visad.*;
import visad.java3d.DisplayImplJ3D;
import visad.java2d.DisplayImplJ2D;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.rmi.*;

   TestStormSingletonSet is a trival class for testing out StormSingletonSet.<P>

public class TestStormSingletonSet  {

  public static void main(String args[])
            throws VisADException, RemoteException {
        // define the real types
        RealType rtLat = RealType.Latitude;
        RealType rtLon = RealType.Longitude;
        RealType rtTop = new RealType("Top", null, null);
        RealType rtMajorRad = new RealType("MajorRadius", null, null);
        RealType rtMinorRad = new RealType("MinorRadius", null, null);
        RealType rtOrientation = new RealType("Orientation", null, null);

        // define a real tuple type made up from the above types
        RealTuple rtupleStorm = new RealTuple( new Real[] {
                                new Real( rtLat, -35.0),
                                new Real( rtLon, 155.0) ,
                                new Real( rtTop, 10.0 ) ,
                                new Real( rtMajorRad, 0.5 ) ,
                                new Real( rtMinorRad, 0.4 ) ,
                                new Real( rtOrientation, 45.0 ) } );

        // define a Specialised SingletonSet (StormSingletonSet) based on the 
above real tuple
        StormSingletonSet ssStorm = new StormSingletonSet(rtupleStorm);

        // now do the display stuff
        final DataReference drTime2Storm = new DataReferenceImpl("Time2Storm");

        // create a Display using Java3D
        DisplayImpl display = new DisplayImplJ3D("image display");

        // map rttLatLon coordinates to display coordinates
        display.addMap(new ScalarMap(RealType.Longitude, Display.XAxis));
        display.addMap(new ScalarMap(RealType.Latitude, Display.YAxis));
        display.addMap(new ScalarMap(rtTop, Display.ZAxis));
        display.addMap(new ScalarMap(rtTop, Display.RGB));

        // link the Display to the data reference

        // create JFrame (i.e., a window) for display and slider
        JFrame frame = new JFrame("Storm VisAD Application");
        frame.addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e) {System.exit(0);}
        // create JPanel in JFrame
        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        // add display to JPanel
        // set size of JFrame and make it visible
        frame.setSize(500, 500);

//  StormSingletonSet
package visad;

// import needed classes
import visad.*;
import java.rmi.*;

   StormSingletonSet is a special class for Set-s containing one member.
   It is designed for displaying Thunderstorm Tracks as ellipses<P>

public class StormSingletonSet extends SingletonSet {

/** construct a StormSingletonSet with the single sample given by a RealTuple */

  public StormSingletonSet(RealTuple d) 
                        throws VisADException, RemoteException {
    System.out.println("StormSingletonSet constructor");

   /** create a PointArray from this Set and color_values;
      can be applied to  ManifoldDimension = 1, 2 or 3 */
  public VisADGeometryArray makePointGeometry(byte[][] color_values)
         throws VisADException {
                System.out.println("StormSingletonSet: makePointGeometry");

    VisADGeometryArray array = super.makePointGeometry(color_values);
    // put some stuff in here, or in a setGeometryArray method to
    // change a single point array to an array of points which make
    // an ellipse

    return array;