removing old nature of code examples before adding new ones

java/examples/Books/Nature of Code/chp5_physicslibraries/box2d/Liquidy/ParticleSystem.pde

@@ -1,59 +0,0 @@
-// Box2D Particle System
-// <http://www.shiffman.net/teaching/nature>
-// Spring 2010
-
-// A class to describe a group of Particles
-// An ArrayList is used to manage the list of Particles 
-
-class ParticleSystem  {
-
-  ArrayList<Particle> particles;    // An ArrayList for all the particles
-  PVector origin;         // An origin point for where particles are birthed
-
-  ParticleSystem(int num, PVector v) {
-    particles = new ArrayList<Particle>();             // Initialize the ArrayList
-    origin = v.get();                        // Store the origin point
-
-      for (int i = 0; i < num; i++) {
-      particles.add(new Particle(origin.x,origin.y));    // Add "num" amount of particles to the ArrayList
-    }
-  }
-
-  void run() {
-    // Display all the particles
-    for (Particle p: particles) {
-      p.display();
-    }
-
-    // Particles that leave the screen, we delete them
-    // (note they have to be deleted from both the box2d world and our list
-    for (int i = particles.size()-1; i >= 0; i--) {
-      Particle p = particles.get(i);
-      if (p.done()) {
-        particles.remove(i);
-      }
-    }
-  }
-
-  void addParticles(int n) {
-    for (int i = 0; i < n; i++) {
-      particles.add(new Particle(origin.x,origin.y));
-    }
-  }
-
-  // A method to test if the particle system still has particles
-  boolean dead() {
-    if (particles.isEmpty()) {
-      return true;
-    } 
-    else {
-      return false;
-    }
-  }
-
-}
-
-
-
-
-