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//ArrayList <Particle> ptcls;
int step = 10;
System sys;
void setup() {
  size(500, 500);
  sys = new System();
  for (int x = 0; x < width; x+=step) {
    for (int y = 0; y < height; y+=step) {
      sys.ptcls.add(new Particle(x + random(-1, 1), y + random(-1, 1)));
    }
  }
  background(240);
}
void draw() {
  sys.run();
}


String timestamp() {
  return year() +"-" + month() +"-" + day() +"-" + hour() +"-" + minute() +"-"+ second();
}
void keyPressed() {
  if (key == 's' || key =='S') {
    String filename = "out-"+ timestamp() +".png";
    saveFrame(filename);
    println("Saved \"" + filename+ "\" to disk");
  }
}

class Trailicle extends Particle{
  Trailicle(float x, float y){
  super(x,y);
  }
}

/*
TODO: Create different types of Particle placement
*/
class System {
  ArrayList<Particle> ptcls;

  System() {
    this.ptcls = new ArrayList<Particle>();
  }


  void run() {
    for (int p = 0; p < ptcls.size(); p++) {
      ptcls.get(p).display();
      ptcls.get(p).update();
    }
  }
}

class Particle {
  float x = 0f;
  float y = 0f;
  float xoff = .0f;
  float yoff = .0f;
  float incr = .01f;
  Particle(float x, float y) {
    this.x = x;
    this.y = y;
  }

  void display() {
    strokeWeight(random(0.5, 2));
    stroke(20, 10);
    point(this.x, this.y);
  }
  void update() {
    float movex = ((noise(xoff) * 2 ) - 1);
    float movey = ((noise(yoff) * 2 ) - 1);
    this.x += movex ;
    this.y += movey;
    xoff = xoff + random(-0.5, 0.5);
    yoff = yoff + random(-0.5, 0.5);
  }
}

*.png