From 0d6af3584213c76da4b7456035d021df830e520c Mon Sep 17 00:00:00 2001
From: Yong Bakos <ybakos@humanoriented.com>
Date: Thu, 21 Feb 2013 18:55:53 -0700
Subject: [PATCH] Incorporating random CrazyParticle addition and refactoring
 logic in dead.

---
 .../MultipleParticleSystems/ParticleSystem.pde  | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/java/examples/Topics/Simulate/MultipleParticleSystems/ParticleSystem.pde b/java/examples/Topics/Simulate/MultipleParticleSystems/ParticleSystem.pde
index d6a3bed0a..d387e8444 100644
--- a/java/examples/Topics/Simulate/MultipleParticleSystems/ParticleSystem.pde
+++ b/java/examples/Topics/Simulate/MultipleParticleSystems/ParticleSystem.pde
@@ -16,7 +16,7 @@ class ParticleSystem {
   }
 
   void run() {
-    // Cycle through the ArrayList using Iterator we are deleting
+    // Cycle through the ArrayList using Iterator, because we are deleting while iterating
     Iterator<Particle> it = particles.iterator();
     while (it.hasNext()) {
       Particle p = it.next();
@@ -28,7 +28,14 @@ class ParticleSystem {
   }
 
   void addParticle() {
-    particles.add(new Particle(origin));
+    Particle p;
+    // Add either a Particle or CrazyParticle to the system
+    if (int(random(0, 2)) == 0) {
+      p = new Particle(origin);
+    } else {
+      p = new CrazyParticle(origin);
+    }
+    particles.add(p);
   }
 
   void addParticle(Particle p) {
@@ -37,11 +44,7 @@ class ParticleSystem {
 
   // A method to test if the particle system still has particles
   boolean dead() {
-    if (particles.isEmpty()) {
-      return true;
-    } else {
-      return false;
-    }
+    return particles.isEmpty();
   }
 
 }
\ No newline at end of file