Incorporated Particle Engine demo contributed by Ben Chappell. Added

description and launch link to jogl-demos web page, currently
commented out in HTML until JSR-231 beta 5 is released.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/../svn-server-sync/jogl-demos/trunk@178 3298f667-5e0e-4b4a-8ed4-a3559d26a5f4

7 files changed, 719 insertions, 0 deletions

diff --git a/src/demos/particles/engine/ControlWindow.java b/src/demos/particles/engine/ControlWindow.java
new file mode 100755
index 0000000..8beb8ee
--- /dev/null
+++ b/src/demos/particles/engine/ControlWindow.java
@@ -0,0 +1,240 @@
+/*
+ * 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;            
+    }
+  }
+}
diff --git a/src/demos/particles/engine/Engine.java b/src/demos/particles/engine/Engine.java
new file mode 100755
index 0000000..62a6237
--- /dev/null
+++ b/src/demos/particles/engine/Engine.java
@@ -0,0 +1,103 @@
+/*
+ * 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.media.opengl.*;
+import com.sun.opengl.util.texture.*;
+import java.net.*;
+import java.util.*;
+import java.io.*;
+
+public class Engine {
+
+  private Texture texture;
+  private List/*<Particle>*/ particles;
+  private String path;
+  public RGBA tendToColor;
+    
+  public Engine(int numParticles, String path) {
+    this.path=path;
+        
+    tendToColor = new RGBA(1.0f, 1.0f, 1.0f, 1.0f);
+        
+    particles = new ArrayList/*<Particle>*/(numParticles);
+    for(int i=0; i<numParticles; i++)
+      particles.add(new Particle());
+  }
+    
+  public void addParticle() {
+    particles.add(new Particle());
+  }
+    
+  public void removeParticle() {
+    if(particles.size()-1 >= 0)
+      particles.remove(particles.size()-1);
+  }
+    
+  public void draw(GL gl) {
+        
+    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+    gl.glLoadIdentity();      
+        
+    for(int i=0; i<particles.size(); i++) {
+      ((Particle) particles.get(i)).draw(gl, texture, tendToColor);
+    }
+  }
+    
+  public void init() {               
+    try {
+      ClassLoader c1 = this.getClass().getClassLoader();
+      URL url = c1.getResource(path);
+      texture = TextureIO.newTexture(url, false, null);
+      texture.enable();
+    }
+    catch(IOException e) {
+      e.printStackTrace();
+    }
+    catch(GLException e) {
+      e.printStackTrace();
+    }
+  }
+    
+  public void reset() {
+    int numParticles = particles.size();
+    particles = new ArrayList/*<Particle>*/(numParticles);
+    for(int i=0; i<numParticles; i++)
+      particles.add(new Particle());
+  }
+
+}
diff --git a/src/demos/particles/engine/GLComponent.java b/src/demos/particles/engine/GLComponent.java
new file mode 100755
index 0000000..299578f
--- /dev/null
+++ b/src/demos/particles/engine/GLComponent.java
@@ -0,0 +1,137 @@
+/*
+ * 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.media.opengl.*;
+import javax.media.opengl.glu.*;
+import com.sun.opengl.util.*;
+
+import java.io.*;
+
+public class GLComponent extends GLCanvas implements GLEventListener {
+    
+    private GLU glu;
+    private FPSAnimator animator;
+    private RGBA background;
+    private RGBA ambient;
+    private Engine engine;
+    
+    public GLComponent(int fps, RGBA ambient, RGBA background, Engine engine) {
+        super(getCapabilities());
+        addGLEventListener(this);
+        glu = new GLU();
+        
+        this.background=background;
+        this.ambient=ambient;             
+        this.engine=engine;
+        
+        animator = new FPSAnimator(this, fps);
+    }
+    
+    private static GLCapabilities getCapabilities() {
+        GLCapabilities caps = new GLCapabilities();
+        caps.setDoubleBuffered(true);
+        caps.setHardwareAccelerated(true);
+        return caps;
+    }
+    
+    public void display(GLAutoDrawable drawable) {
+        final GL gl = drawable.getGL(); 
+        engine.draw(gl);
+    }
+    
+    
+    
+    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
+        
+    }
+    
+    public void init(GLAutoDrawable drawable) {
+        final GL gl = drawable.getGL();        
+
+        gl.glShadeModel(GL.GL_SMOOTH);
+        // Set the background / clear color.
+        gl.glClearColor(background.r, background.g, background.b, background.a);
+        // Clear the depth
+        gl.glClearDepth(1.0);
+        // Disable depth testing.
+        gl.glDisable(GL.GL_DEPTH_TEST);        
+        // Enable blending and specify blening function.
+        gl.glEnable(GL.GL_BLEND);
+        gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE);
+        // Get nice perspective calculations. 
+        gl.glHint(GL.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST);
+        // Nice point smoothing.
+        gl.glHint(GL.GL_POINT_SMOOTH_HINT, GL.GL_NICEST);
+        // Enable texture mapping.
+        gl.glEnable(GL.GL_TEXTURE_2D);
+        
+        animator.start();
+        
+        engine.init();
+        
+    }    
+    
+    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
+        GL gl = drawable.getGL();
+        // the size of openGL
+        gl.glViewport(0,0, width, height);
+        
+        // perspective view (smaller for further behind)
+        gl.glMatrixMode(GL.GL_PROJECTION);
+        gl.glLoadIdentity();
+        
+        // perspective
+        double ratio = (double)width/(double)height;
+        // angle, ratio, nearest, farthest
+        glu.gluPerspective(45.0, ratio, 0.0,  1.0);
+        
+        // draw into the model matrix now
+        gl.glMatrixMode(GL.GL_MODELVIEW);
+        gl.glLoadIdentity();
+    }
+    
+    public void setFPS(int fps) {
+        animator.stop();
+        animator = new FPSAnimator(this, fps);
+        animator.start();
+    }
+    
+    public void kill() {
+        animator.stop();
+    }
+}
diff --git a/src/demos/particles/engine/Particle.java b/src/demos/particles/engine/Particle.java
new file mode 100755
index 0000000..82e0756
--- /dev/null
+++ b/src/demos/particles/engine/Particle.java
@@ -0,0 +1,121 @@
+/*
+ * 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 com.sun.opengl.util.texture.*;
+
+import javax.media.opengl.*;
+
+public class Particle {
+  private XYZ currentPos;
+  private RGBA rgba;
+    
+  public Particle() {
+    currentPos = new XYZ((float)Math.random(), 
+                         (float)Math.random(), 
+                         -30.0f               
+                         );
+        
+    rgba = rgba = new RGBA((float)Math.random(), 
+                           (float)Math.random(), 
+                           (float)Math.random(),
+                           (float)Math.random());
+  }
+    
+  public void draw(GL gl, Texture texture, RGBA tendToColor) {
+    adjust(tendToColor);
+    texture.bind();
+    gl.glColor4f(rgba.r,rgba.g,rgba.b,rgba.a);
+        
+    gl.glBegin(GL.GL_QUADS);
+    gl.glTexCoord2f(0.0f, 0.0f); gl.glVertex3f(currentPos.x, currentPos.y-2, currentPos.z);
+    gl.glTexCoord2f(1.0f, 0.0f); gl.glVertex3f(currentPos.x+2, currentPos.y-2, currentPos.z);
+    gl.glTexCoord2f(1.0f, 1.0f); gl.glVertex3f(currentPos.x+2, currentPos.y, currentPos.z);
+    gl.glTexCoord2f(0.0f, 1.0f); gl.glVertex3f(currentPos.x, currentPos.y, currentPos.z);
+    gl.glEnd();
+  }
+    
+  private void tendToColor(RGBA tendToColor) {
+    float red = 0.0f;
+    float blue = 0.0f;
+    float green = 0.0f;
+    float sign=1.0f;
+
+    if(Math.random()>=0.5)
+      sign=-1.0f;
+
+    // RED
+    if(tendToColor.r <= 1-tendToColor.r) 
+      red = tendToColor.r;
+    else 
+      red = 1-tendToColor.r;
+
+    red = (float)(Math.random()*red*sign+tendToColor.r);
+
+    // GREEN
+    if(tendToColor.g <= 1-tendToColor.g) 
+      green = tendToColor.g;            
+    else 
+      green = 1-tendToColor.g;
+
+    green =(float)(Math.random()*green*sign+tendToColor.g);
+
+    // BLUE
+    if(tendToColor.b <= 1-tendToColor.b) 
+      blue = tendToColor.b;            
+    else 
+      blue = 1-tendToColor.b;
+
+    blue = (float)(Math.random()*blue*sign+tendToColor.b);
+
+    rgba = new RGBA(red, green, blue, (float)Math.random());
+  }
+    
+  private void tendToPos() {
+    XYZ xyz = new XYZ((float)Math.random()-0.5f,(float)Math.random()-0.5f,(float)Math.random()-0.5f);
+    currentPos.add(xyz);
+  }
+    
+  private void adjust(RGBA tendToColor) {
+    tendToPos();
+        
+    rgba.a-=Math.random()/100;
+    if(rgba.a<=0)
+      tendToColor(tendToColor);
+  }
+    
+}
diff --git a/src/demos/particles/engine/RGBA.java b/src/demos/particles/engine/RGBA.java
new file mode 100755
index 0000000..06f8863
--- /dev/null
+++ b/src/demos/particles/engine/RGBA.java
@@ -0,0 +1,56 @@
+/*
+ * 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;
+
+public class RGBA {
+    
+  public float r;
+  public float g;
+  public float b;
+  public float a;
+        
+  public RGBA() {
+    this.r = this.g = this.g = this.a = 0.0f;
+  }
+    
+  public RGBA(float r, float g, float b, float a) {
+    this.r=r;
+    this.g=g;
+    this.b=b;
+    this.a=a;
+  }
+}
diff --git a/src/demos/particles/engine/XYZ.java b/src/demos/particles/engine/XYZ.java
new file mode 100755
index 0000000..f38a6fa
--- /dev/null
+++ b/src/demos/particles/engine/XYZ.java
@@ -0,0 +1,62 @@
+/*
+ * 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;
+
+public class XYZ {
+    
+  public float x;
+  public float y;
+  public float z;
+    
+  public XYZ() {
+    this.x = this.y = this.z = 0.0f;        
+  }
+    
+  public XYZ(float x, float y, float z) {
+    this.x=x;
+    this.y=y;
+    this.z=z;
+  }
+    
+  public XYZ add(XYZ xyz) {        
+    x += xyz.x;
+    y += xyz.y;
+    z += xyz.z;
+        
+    return this;
+  }
+}
diff --git a/src/demos/particles/engine/images/particle.jpg b/src/demos/particles/engine/images/particle.jpg
new file mode 100755
index 0000000..70e28ac
--- /dev/null
+++ b/src/demos/particles/engine/images/particle.jpg