I'm not sure I completely nderstand you data and how you want
to display it, but here's a quick example of how you could do
it. This code compiles (with suitable substitutions for 'Xi',
'Yj' and 'Zij") but I have not tried to run it. On the other
hand, it is an combination of working examples from the
Developer's Guide. Good luck, and let me know if you have
any questions or problems.
Bill
public class Scatter {
// import needed classes
import visad.*;
import visad.java3d.DisplayImplJ3D;
import java.rmi.RemoteException;
import java.awt.*;
import java.awt.event.*;
import java.awt.swing.*;
public static void main(String args[])
throws VisADException, RemoteException {
// construct a MathType ((I, J) -> (X, Y, Z))
// first construct (I, J)
RealType I = new RealType("I", null, null);
RealType J = new RealType("J", null, null);
RealTupleType IJ = new RealTupleType(new RealType[] {I, J});
// next construct (X, Y, Z)
RealType X = new RealType("X", null, null);
RealType Y = new RealType("Y", null, null);
RealType Z = new RealType("Z", null, null);
RealTupleType XYZ = new RealTupleType(new RealType[] {X, Y, Z});
// now construct ((I, J) -> (X, Y, Z))
FunctionType field_type = new FunctionType(IJ, XYZ);
// construct a 5 by 3 integer sampling
Integer2DSet domain_set = new Integer2DSet(5, 3);
// construct a FlatField to hold values
FlatField field = new FlatField(field_type, domain_set);
// fill values into 'data' array
float[][] data = new float[3][5 * 3];
for (int i=0; i<5; i++) {
for (int j=0; j<3; j++) {
// substitute source of values for 'Xi', 'Yj'
// and 'Zij' in these three lines
data[0][i + 5*j] = Xi;
data[0][i + 5*j] = Yi;
data[0][i + 5*j] = Zij;
}
}
// set the data values into the FlatField
field.setSamples(data);
// construct a scatter plot Display
DisplayImpl display = new DisplayImplJ3D("image display");
// construct mappings to define how data are displayed
display.addMap(new ScalarMap(X, Display.XAxis));
display.addMap(new ScalarMap(Y, Display.YAxis));
display.addMap(new ScalarMap(Z, Display.ZAxis));
/*
NOTE, if you wanted to see your data as a surface of Z
values, colored by X and Y values, you do use the
following mappings INSTEAD:
display.addMap(new ScalarMap(I, Display.XAxis));
display.addMap(new ScalarMap(J, Display.YAxis));
display.addMap(new ScalarMap(Z, Display.ZAxis));
display.addMap(new ScalarMap(X, Display.Red));
display.addMap(new ScalarMap(Y, Display.Green));
*/
// create a reference to the data
DataReference field_ref = new DataReferenceImpl("field");
field_ref.setData(field);
// and use it to link data to display
display.addReference(field_ref);
// create JFrame (i.e., a window) for display and slider
JFrame frame = new JFrame("Simple 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));
panel.setAlignmentY(JPanel.TOP_ALIGNMENT);
panel.setAlignmentX(JPanel.LEFT_ALIGNMENT);
frame.getContentPane().add(panel);
// add display to JPanel
panel.add(display.getComponent());
// set size of JFrame and make it visible
frame.setSize(500, 600);
frame.setVisible(true);
}
}
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
whibbard@xxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
"kill cross-platform Java by growing the polluted Java market"
- from an internal Microsoft planning document
