Re-adding Topics to SVN

java/examples/Topics/Simulate/MultipleParticleSystems/MultipleParticleSystems.pde

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+/**
+ * Multiple Particle Systems
+ * by Daniel Shiffman.  
+ * 
+ * Click the mouse to generate a burst of particles
+ * at mouse location. 
+ * 
+ * Each burst is one instance of a particle system
+ * with Particles and CrazyParticles (a subclass of Particle)
+ * Note use of Inheritance and Polymorphism here. 
+ */
+ 
+ArrayList psystems;
+
+void setup() {
+  size(640, 360);
+  colorMode(RGB, 255, 255, 255, 100);
+  psystems = new ArrayList();
+  smooth();
+}
+
+void draw() {
+  background(0);
+
+  // Cycle through all particle systems, run them and delete old ones
+  for (int i = psystems.size()-1; i >= 0; i--) {
+    ParticleSystem psys = (ParticleSystem) psystems.get(i);
+    psys.run();
+    if (psys.dead()) {
+      psystems.remove(i);
+    }
+  }
+
+}
+
+// When the mouse is pressed, add a new particle system
+void mousePressed() {
+  psystems.add(new ParticleSystem(int(random(5,25)),new PVector(mouseX,mouseY)));
+}
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