float posX,posY;
float count = 0;
int bobNum = 5;

Queu[] bob = new Queu[bobNum];

void setup () {
  size (500,300);
  smooth ();
  cursor(CROSS);
  
  for (int i=0; i<bobNum; i++){
    bob[i] = new Queu(i,width/2,height,bobNum);
  }
}

void draw () {
  posX += (mouseX - posX) / 10;
  posY += (mouseY - posY) / 10;
  
  count += 0.1;
  
  for (int i=0; i<bobNum; i++){
    bob[i].update ();
  }
  
  noStroke ();
  fill (255,255,255, 30);
  rect (0,0, width,height);
  
  fill (255);
  ellipse (posX,posY, 5, 5);
     
  fill (0,0,0, 40);
  ellipse (posX,posY, 20+sin(count)*3, 20+sin(count)*3);
  
  stroke (0,0,0, 80);
  fill (255,0,0, 80);
    
  for (int i=0; i<bobNum; i++){
    bob[i].update ();
    bob[i].draw ();
  }
}

void keyReleased () {
  Queu[] temp = new Queu[bobNum];
  temp = bob;
  
  bobNum ++;
  bob = new Queu[bobNum];
  arraycopy (temp, bob);
  bob[bobNum-1] = new Queu(bobNum-1, width/2, height, bobNum);
  
  for (int i=0; i<bobNum; i++){
    bob[i].setSize (bobNum);
  }
}

void mousePressed () {
  bobNum = 5;
  bob = new Queu[bobNum];
  for (int i=0; i<bobNum; i++){
    bob[i] = new Queu(i,width/2,height,bobNum);
  }
}

class Queu {
  float X,Y;
  int n;
  float bigness;
  
  Queu (int num, float x, float y, int total) {
    n = num;
    X = x;
    Y = y;
    bigness = 15 - ((15/total)*n);
  }

  void draw () {
    ellipse (X+random(-2,2),Y+random(-2,2), bigness, bigness);
  }
  
  void update () {
    if (n == 0){
      if (bigness - distTo(posX,posY) < 0) {      
        X -= (X - posX)/10;
        Y -= (Y - posY)/10;
      }
    }else{
      if (bob[n-1].bigness - distTo(bob[n-1].X,bob[n-1].Y) < 0) {      
        X -= (X - bob[n-1].X)/10;
        Y -= (Y - bob[n-1].Y)/10;
      }
    }
  }
  
  float distTo (float a, float b) {
    return sqrt(pow(X-a,2)+pow(Y-b,2));
  }
  
  void setSize (float total) {
    bigness = 15 - ((15/total)*n);
  }
}