Metro metro;
Layer layer;

int play_pos = 0;
int play_pos_previous = 0;

void setup()
{
  size(500, 500);
 
  // Metroの初期化
  metro = new Metro();
  metro.set(100); // 100[ms]おきにtrueを返す
  
  layer = new Layer();
  layer.setup();
}


void draw()
{
  background(0);
  for ( int i = 0; i < 16; i++ ) {
    layer.button[i].update();
    layer.button[i].draw();
  }
  if( metro.update() ){    
    layer.update();    
  }
}