Hi Adele,
> Has anyone done parallel coordinate plots in VisAD?
I was about to tell you that it wouldn't be too difficult,
but decided that a parallel coordinate example would be useful
so whipped up the attached example. In VisAD data for a parallel
coordinate display would typically be a FlatField with MathType:
(index -> (coord1, coord2, ..., coordN))
The main() method of the attached Parallel.java example creates
such a FlatField with random values, then passes it and a
DisplayImpl to the parallel() method, which constructs a FieldImpl
with MathType:
(index -> Set(coordinate, value))
that generates a rudimentary parallel coordianate display for
the original FlatField, in the DisplayImpl. This could be
prettied up.
Cheers,
Bill
/*
VisAD system for interactive analysis and visualization of numerical
data. Copyright (C) 1996 - 2001 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
*/
// import needed classes
import visad.*;
import visad.java3d.*;
import java.rmi.RemoteException;
import java.io.IOException;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Parallel {
private static final int NCOORDS = 5;
private static final int NROWS = 6;
// type 'java Parallel' to run this application
public static void main(String args[])
throws VisADException, RemoteException, IOException {
RealType index = new RealType("index");
RealType[] coords = new RealType[NCOORDS];
for (int i=0; i<NCOORDS; i++) {
coords[i] = new RealType("coord" + i);
}
RealTupleType range = new RealTupleType(coords);
FunctionType ftype = new FunctionType(index, range);
Integer1DSet index_set = new Integer1DSet(NROWS);
float[][] samples = new float[NCOORDS][NROWS];
for (int i=0; i<NCOORDS; i++) {
for (int j=0; j<NROWS; j++) {
samples[i][j] = (float) Math.random();
}
}
FlatField data = new FlatField(ftype, index_set);
data.setSamples(samples, false);
// create a 2-D Display using Java3D
DisplayImpl display =
new DisplayImplJ3D("display", new TwoDDisplayRendererJ3D());
parallel(display, data);
// create JFrame (i.e., a window) for display and slider
JFrame frame = new JFrame("Parallel Coordinates 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, 500);
frame.setVisible(true);
}
/** create parallel coordinates display for data */
public static void parallel(DisplayImpl display, FlatField data)
throws VisADException, RemoteException {
FunctionType ftype = (FunctionType) data.getType();
RealType index = (RealType) ftype.getDomain().getComponent(0);
RealTupleType range = (RealTupleType) ftype.getRange();
int ncoords = range.getDimension();
int nrows = data.getLength();
Set index_set = data.getDomainSet();
float[][] samples = data.getFloats(false);
RealType x = new RealType("coordinate");
RealType y = new RealType("value");
SetType xy = new SetType(new RealTupleType(x, y));
FunctionType ptype = new FunctionType(index, xy);
FieldImpl pfield = new FieldImpl(ptype, index_set);
for (int j=0; j<nrows; j++) {
float[][] locs = new float[2][ncoords];
for (int i=0; i<ncoords; i++) {
locs[0][i] = i;
locs[1][i] = samples[i][j];
}
Gridded2DSet set = new Gridded2DSet(xy, locs, ncoords);
pfield.setSample(j, set, false);
}
// create a DataReference for river system
DataReference parallel_ref = new DataReferenceImpl("parallel");
parallel_ref.setData(pfield);
display.addMap(new ScalarMap(x, Display.XAxis));
display.addMap(new ScalarMap(y, Display.YAxis));
// enable axis scales
display.getGraphicsModeControl().setScaleEnable(true);
// link display to parallel display
display.addReference(parallel_ref);
}
}
