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

1 files changed, 121 insertions, 0 deletions

diff --git a/src/demos/particles/engine/Particle.java b/src/demos/particles/engine/Particle.java
new file mode 100755
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+++ b/src/demos/particles/engine/Particle.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 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);
+  }
+    
+}