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diff --git a/src/demos/particles/engine/ControlWindow.java b/src/demos/particles/engine/ControlWindow.java
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+/*
+ * Copyright (c) 2006 Ben Chappell ([email protected]) All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *   
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *    
+ * - Redistribution in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *   
+ * The names of Ben Chappell, Sun Microsystems, Inc. or the names of
+ * contributors may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *    
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. BEN CHAPPELL,
+ * SUN MICROSYSTEMS, INC. ("SUN"), AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL BEN
+ * CHAPPELL, SUN, OR SUN'S LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT 
+ * OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
+ * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF BEN
+ * CHAPPELL OR SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ *   
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ */
+
+package demos.particles.engine;
+
+import javax.swing.*;
+import java.awt.*;
+import javax.swing.border.*;
+import java.awt.event.*;
+import javax.swing.event.*;
+
+public class ControlWindow extends JFrame implements ActionListener, ChangeListener {
+    
+  // For the engine
+  private Engine engine;
+  private GLComponent glComponent;
+  private Integer numParticles;
+    
+  // Swing components    
+  private JSlider greenSlider;
+  private JSlider redSlider;
+  private JSlider blueSlider;
+    
+  private JButton resetButton;
+  private JButton closeButton;
+    
+  private JSpinner particleSpinner;
+    
+  public ControlWindow() {
+    super("Particle Engine");
+        
+    Dimension d = getToolkit().getScreenSize();
+        
+    buildFrame(d);        
+    initComponents();        
+    setVisible(true);
+  }
+    
+  private void buildFrame(Dimension d) {
+    // Nicely center the window on the screen
+    int width = 800;
+    int x = (int)(d.getWidth()/2)-(int)(width/2);
+        
+    int height = 800;
+    int y = (int)(d.getHeight()/2)-(int)(height/2);
+        
+    setBounds(x, y, width, height);
+    setResizable(false);
+    getContentPane().setLayout(new GridBagLayout());
+    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
+  }
+    
+  private void initComponents() {
+    // This will be used when borders or GridBagConstraints are needed
+    Border border;
+    GridBagConstraints constraints;
+        
+    // Engine components 
+    numParticles = new Integer(1000);
+    engine = new Engine(numParticles.intValue(), "demos/particles/engine/images/particle.jpg");
+    glComponent = new GLComponent(100, new RGBA(0.0f, 0.0f, 0.0f, 1.0f), new RGBA(0.0f, 0.0f, 0.0f, 1.0f), engine);        
+    
+    // Close and reset buttons
+    resetButton = new JButton("Reset");
+    resetButton.addActionListener(this);
+    closeButton = new JButton("Close");
+    closeButton.addActionListener(this);
+        
+    // The RGB sliders
+    redSlider = new JSlider(0, 100, (int)engine.tendToColor.r*100) ;
+    redSlider.addChangeListener(this);
+    greenSlider = new JSlider(0, 100, (int)engine.tendToColor.g*100) ;
+    greenSlider.addChangeListener(this);
+    blueSlider = new JSlider(0, 100, (int)engine.tendToColor.b*100) ;
+    blueSlider.addChangeListener(this);
+        
+    // Particle spinner
+    particleSpinner = new JSpinner(new SpinnerNumberModel(numParticles,
+                                                          new Integer(0),
+                                                          null,
+                                                          new Integer(1)));
+    particleSpinner.addChangeListener(this);
+    particleSpinner.setPreferredSize(
+                                     new Dimension((int)(getBounds().width/3.5), 25));
+        
+    // The color control panel
+    JPanel colorPanel = new JPanel(new GridBagLayout());
+    border = BorderFactory.createTitledBorder(
+                                              BorderFactory.createLineBorder(new Color(0.0f,0.0f,0.0f)),
+                                              "Color Tendency");
+    colorPanel.setBorder(border);        
+        
+    constraints = new GridBagConstraints();
+    constraints.insets = new Insets(3,2,3,2);   
+    constraints.fill=constraints.HORIZONTAL;
+        
+    constraints.gridx = 0;
+    constraints.gridy = 0;
+    colorPanel.add(new JLabel("Red"), constraints);      
+    constraints.gridx = 1;
+    colorPanel.add(redSlider, constraints);
+        
+    constraints.gridx = 0;
+    constraints.gridy = 1;
+    colorPanel.add(new JLabel("Green"), constraints);
+    constraints.gridx = 1;
+    colorPanel.add(greenSlider, constraints);
+        
+    constraints.gridx = 0;
+    constraints.gridy = 2;
+    colorPanel.add(new JLabel("Blue"), constraints);
+    constraints.gridx = 1;
+    colorPanel.add(blueSlider, constraints);
+        
+    // The panel containing the spinnger
+    JPanel numPanel = new JPanel(new GridBagLayout());
+    border = BorderFactory.createTitledBorder(
+                                              BorderFactory.createLineBorder(new Color(0.0f,0.0f,0.0f)),
+                                              "Number of Particles");
+    numPanel.setBorder(border);        
+        
+    constraints = new GridBagConstraints();
+    numPanel.add(particleSpinner, constraints);
+        
+    // The panel containing the reset and close buttons
+    JPanel optionsPanel = new JPanel(new GridBagLayout());
+    border = BorderFactory.createTitledBorder(
+                                              BorderFactory.createLineBorder(new Color(0.0f,0.0f,0.0f)),
+                                              "Options");
+    optionsPanel.setBorder(border);
+        
+    constraints = new GridBagConstraints();
+    constraints.insets = new Insets(5,5,5,5);
+    optionsPanel.add(resetButton, constraints);
+    constraints.gridy = GridBagConstraints.RELATIVE;
+    constraints.gridx = GridBagConstraints.RELATIVE;
+    optionsPanel.add(closeButton, constraints);
+        
+    // The panel containing the the OpenGL content
+    JPanel glPanel = new JPanel(new BorderLayout());    
+    glPanel.setPreferredSize(new Dimension(getBounds().width-10, (int)getBounds().height*3/4));
+    glPanel.add(glComponent);        
+        
+    constraints = new GridBagConstraints();
+    constraints.weightx = constraints.weighty = 1.0d;
+    constraints.fill=constraints.BOTH;
+        
+    constraints.gridx = 0;
+    constraints.gridy = 0;
+    glPanel.setBorder(BorderFactory.createRaisedBevelBorder());
+    getContentPane().add(glPanel, constraints);
+        
+    // The panel containing the panels that contain all the other components
+    JPanel bottomPanel = new JPanel(new GridLayout(1,3,3,3));
+    bottomPanel.add(colorPanel);
+    bottomPanel.add(numPanel);
+    bottomPanel.add(optionsPanel);        
+    constraints.gridx = 0;
+    constraints.gridy = GridBagConstraints.RELATIVE;
+    getContentPane().add(bottomPanel, constraints);
+  }
+    
+  public static void main(String[] args) {
+    new ControlWindow();
+  }
+    
+  public void actionPerformed(ActionEvent e) {
+    if(e.getSource().equals(closeButton)) {
+      setVisible(false);
+      dispose();
+      System.exit(0);
+    }
+    if(e.getSource().equals(resetButton))
+      engine.reset();
+  }
+
+  public void stateChanged(ChangeEvent e) {
+    if(e.getSource().equals(particleSpinner)) {
+      // Get the number; loop up or down until the vector in the engine has the proper number
+      Integer newNum = (Integer)particleSpinner.getValue();
+      int diff = newNum.intValue()-numParticles.intValue();
+      if(diff>0)
+        for(int i=0; i<diff; i++)
+          engine.addParticle();
+      else
+        for(int i=0; i>diff; i--)
+          engine.removeParticle();
+
+      numParticles=newNum;
+    }
+    if(e.getSource().equals(redSlider)) {
+      float value = (float)(redSlider.getValue());
+      value/=100;
+      engine.tendToColor.r = value;
+    }
+    if(e.getSource().equals(greenSlider)) {
+      float value = (float)(greenSlider.getValue());
+      value/=100;
+      engine.tendToColor.g = value;            
+    }
+    if(e.getSource().equals(blueSlider)) {
+      float value = (float)(blueSlider.getValue());
+      value/=100;
+      engine.tendToColor.b = value;            
+    }
+  }
+}