class Thing {
  PVector loc;
  PVector vel;
  PVector acc;
  boolean walking;
  boolean slowing;
  boolean playing;
  float dur;
  float maxVel;
  int circle;
  float prob;
  
  //The Constructor (called when the object is first created)
  Thing(PVector a, PVector v, PVector l) {
    acc = a.get();
    vel = v.get();
    loc = l.get();
    walking = false;
    slowing = false;
    playing = true;
    dur = random(200);
    maxVel = random(.05, .1);
    circle = 1;
  }

  //main function to operate object)
  void go() {
    render();
    borders();
    if(walking)  {walk();}
    if(slowing)  {slow();}
    if(playing)  {play();}
  }
  
  //function to update location
  void walk() {
    vel.add(acc);
    loc.add(vel);
    
   if((abs(vel.x) >= maxVel) || (abs(vel.y) >= maxVel)){walking = false; slowing = true; playing = false;}
  }
  
 void slow(){
   if (abs(vel.x) > 0.03){vel.x *= .97;loc.add(vel);}
   if (abs(vel.y) > 0.03){vel.y *= .97;loc.add(vel);}
   
   else {setXY(0.0f,0.0f);slowing = false; playing = true; walking = false;XYToCircle(loc.x, loc.y);}
 }
 
 void play(){
    prob = random(10000);
    if(prob > 9995){newPlace();}
 }
 
 void setXY (float x, float y){
   vel.x = x;
   vel.y = y;
 }
 
  void borders() {
    float disX = width/2 - loc.x;
    float disY = height/2 - loc.y;
    
    if(sqrt(sq(disX) + sq(disY)) > (width/2) ){
      acc.x = -acc.x;
      acc.y = -acc.y;
      vel.x = -vel.x;
      vel.y = -vel.y;
      
    }
  }
  
  void newPlace(){
    prob = random(2);
    //Most of the time, choose a random angle for your walk.
    if (prob < 1f){
    acc.x= random (-.03,.03);
    acc.y= random (-.03,.03);}
    // Sometimes, choose to go towards the center.
    else if (prob >= 1f){
      PVector diff = PVector.sub(celloThing.loc, loc);
      diff.normalize();
      diff.mult(2.0);
      diff.x  = acc.x;
      diff.y  = acc.y;
    }
    maxVel = random(1, -1);
    walking = true;
    slowing = false;
    playing = false;
    dur = random(400);
  }

  //function to display
  void render() {
    rectMode(CENTER);
    noStroke();
    fill(255, 181, 31, 160);
    ellipse(loc.x,loc.y,10,10);
    if (showVectors) {
      drawVector(vel,loc,10);
    }
  }
  
  int XYToCircle (float x, float y){
  float disX;
  float disY;
  float rad;
  
  for(int iter = 8; iter > 0; iter--){
    float distX = width/2 - loc.x;
    float distY = height/2 - loc.y;
    rad = (iter * width/7);
    if(sqrt(sq(distX) + sq(distY)) < rad/2 ){
      circle = iter;}
  }
  
  return(circle);
  }

}