Visual Metronome

/*
 * metronome
 */
int stage = 600;
int mains = int(random(3,9) );
int subs = int(random(3,6) );
float moon_size = 3;
int bpm = 60;
int active_main = 0;
int active_sub = 0;
color main_color = #292B89;
color first_color = #1A1B55;
color active_color = 0x95FFFFFF;
int my_frame_rate = 12;
float bps = float(bpm) / 60 ;

void setup() {
  size(stage, stage);
  frameRate(my_frame_rate);
  noStroke();
}
void draw() {
  background(#989898);
  if( frameCount % (my_frame_rate/bps) < 1 ){
    active_main+=1;
    if(active_main>=mains){
      active_main=0;
    }
  }
  if( frameCount % (my_frame_rate/bps/subs) < 1 ){
    active_sub+=1;
    if(active_sub==subs){
      active_sub=0;
    }
  }
  Circle a = new Circle(width/2, height/2, stage/2, mains);
  a.make_moons( active_main );
  a.moons[active_main].make_moons( active_sub );
}
void mouseMoved(){
  mains = 2 + mouseX /(stage/10);
  moon_size = mains/1.555;
  active_main=0;
}
class Circle{
  float r, x, y;
  int active_moon, each_angle, sections;
  Circle moons[] = new Circle[23];

  Circle(float x_init,float y_init,float r_init, int divisions_init){
    x = x_init;
    y = y_init;
    r = r_init;
    sections = divisions_init;
    each_angle = 360 / sections;
  }
  void make(){
    ellipse(x, y, r, r);
  }
  void make_moons( int active_moon ){
    int angle = each_angle;
    for(int i = 0; i < sections; i+=1 ){
      float moon_x = x + cos(radians(angle)) * (r/2);
      float moon_y = y + sin(radians(angle)) * (r/2);
      moons[i] = new Circle(moon_x, moon_y, r / 4, subs);
      if(i==active_moon){fill(active_color);}else if(i==0){fill(first_color);} else{fill(main_color);} // HIGHLIGHT FIRST & ACTIVE MOON
      moons[i].make();
      angle = angle + each_angle;
    }
  }
}