int mxtry = 10;
float radius = 10;
float sqradius = radius*radius;

class Circle{
  
  // Members 
  float x, y, px, py;
  int parent;
  
  Circle(){
    x = 0;
    y = 0;
  }
  
  void Position(){
    if (count>=0){
      for(int i=0; i<mxtry; i++){
        // get a random position
        if (count == 0){
          x = cx;
          y = cy;
          parent = 0;
          px = cx;
          py = cy;
        }else{ 
          // random parent
          parent = round(random(1,count)) - 1;
          px = clist[parent].GetX();
          py = clist[parent].GetY();
          float angle = random(-180,180);
          x = (radius*cos(angle)) + px;
          y = (radius*sin(angle)) + py;
        }
        
        // detect collisions
        boolean outside = true;
        if ((x>=0)&&(x<=width)&&(y>=0)&&(y<=height)){
          for (int j=0; j<count; j++){
            // get square distance
            if (clist[j]!=null){
              float sd = ((clist[j].GetX()-x)*(clist[j].GetX()-x)) + ((clist[j].GetY()-y)*(clist[j].GetY()-y));
              if (sd<=sqradius){
                if (debug){
                  strokeWeight(1);
                  stroke(0,255,255,64);
                  fill(0,255,255,64);
                  ellipse(x,y,4,4);
                }
                outside = false;
                break;
              }
            }
          }
        }else{
          outside = false;
        }
        
        if (outside){
          count++;
          break;
        }
      }
    }
  }
  
  void Draw(){
    colorMode(HSB);
    stroke(count%255,130,255);
    //strokeWeight(1);
    //line(clist[parent].x,clist[parent].y,x,y);
    noStroke();
    fill(count%255,130,255,8);
    for (int rd = 15; rd > 5; rd-= 2){
      fill(count%255,130,255,20-rd);
      ellipse(x,y,rd,rd);
    }
  }
  
  float GetX(){
    return x;
  }
  
  float GetY(){
    return y;
  }
}