class Squirtmanager {
        ArrayList squirts;
   
    
Squirtmanager() {
  squirts = new ArrayList();              // Initialize the arraylist  
}

void run() {
    if (pressMode==1) {
       if (eraseMode==1) {
         eraseSquirt();
         }
       else {
        addSquirt();
       }
    }
  
    for (int i = 0; i < squirts.size(); i++) {//working-adding to arraylist
      Squirt s = (Squirt) squirts.get(i);
      s.run();
      //can add in two 'if clauses' here later- if erased, delete. or if colorchanged, erase particle and replace with one of different color.
    }
    
}

void addSquirt () { 
    squirts.add(new Squirt());
  }

void eraseSquirt () { 
        for (int i = squirts.size()-1; i >= 0; i--) {
                    Squirt e = (Squirt) squirts.get(i);
                    float squirtx= e.getcol();
                    int coldiff= int (abs(squirtx-mouseX));
                    int layerdist= int (abs(e.getlayer()-curlayer));
                    int rowdist= int (abs(e.getrow()-mouseY)) ;
                            if ( (coldiff<=boxsize) 
                            &&   (layerdist<=boxsize) 
                            &&   (rowdist <=boxsize)  )  {
                                    squirts.remove(i);
                            }
        }
}

void sortbyrow() {
}

void sortbycolumn() {
}

}

/*From MULTIPLE PARTICLE SYSTEMS:

class ParticleSystem {

  ArrayList particles;    // An arraylist for all the particles
  Vector3D origin;        // An origin point for where particles are birthed

  ParticleSystem(int num, Vector3D v) {
    particles = new ArrayList();              // Initialize the arraylist
    origin = v.copy();                        // Store the origin point
    // Add an initial group of particles to the ArrayList
    for (int i = 0; i < num; i++) {
      if (random(1) > 0.2) {
        particles.add(new Particle(origin));
      } else {
        // There is a 20% chance we will add a "crazy particle" into the system
        particles.add(new CrazyParticle(origin));
      }
    }
  }

  void run() {
    // Cycle through the ArrayList backwards b/c we are deleting
    for (int i = particles.size()-1; i >= 0; i--) {
      Particle p = (Particle) particles.get(i);
      p.run();
      if (p.dead()) {
        particles.remove(i);
      }
    }
  }

  void addParticle() {
    particles.add(new Particle(origin));
  }

  void addParticle(Particle p) {
    particles.add(p);
  }

  // A method to test if the particle system still has particles
  boolean dead() {
    if (particles.isEmpty()) {
      return true;
    } else {
      return false;
    }
  }

}
*/