java/examples/Topics/Simulate/SimpleParticleSystem/applet/SimpleParticleSystem.pde

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+/**
+ * Simple Particle System
+ * by Daniel Shiffman.  
+ * 
+ * Particles are generated each cycle through draw(),
+ * fall with gravity and fade out over time
+ * A ParticleSystem object manages a variable size (ArrayList) 
+ * list of particles. 
+ */
+ 
+ParticleSystem ps;
+
+void setup() {
+  size(640, 360);
+  colorMode(RGB, 255, 255, 255, 100);
+  ps = new ParticleSystem(1,new Vector3D(width/2,height/2,0));
+  smooth();
+}
+
+void draw() {
+  background(0);
+  ps.run();
+  ps.addParticle(mouseX,mouseY);
+}
+
+
+