class Follower {

  int posX, posY;  
  float vecX, vecY;

  float easing = .0008;

  Follower() {
    //init position and direction
    posX = int(random(0, width));  
    posY = int(random(0, height));   
    vecX = random(-2, 2);
    vecY = random(-2, 2);
  }

  void updatePosition(Leader l) {
    //add some noise   
    vecX +=random( -1,1);
    vecY +=random( -1,1);

    //aim at the leader, but don't accelerate too much
    vecX += (l.getPositionX() - posX) * easing;
    vecX = constrain(vecX, -random(1,5), random(1,5));
    vecY += (l.getPositionY() - posY) * easing;
    vecY = constrain(vecY, -random(1,5), random(1,5)); //this max of magnitude 3 is why they all move exactly the same.

    //update position
    posX += vecX;
    posY += vecY;
  } 

  void draw() {
    fill(255,25, 0);
    ellipse(posX, posY, 4, 4); 
  }
}