class Firefly {
  float x, y, w, xspeed, yspeed;
  //color c;

  Firefly(float x_, float y_, float w_){
    x = x_;
    y = y_;
    w = w_;
    xspeed = random(-5,5);
    yspeed = random(-5,5);
    //c = color(random(255), random(255), random(255), random(100,255));
  }

  void move() {
    x = x+xspeed;
    if (x > width+100 || x < -100) {
      xspeed = xspeed*-0.95;
      x = width;
    }
    y = y+yspeed;
    if (y > height+100 || y < -100) {
      yspeed = yspeed*-0.95;
      y = height;
    }
  }

  void display() {
    //fill(0);
    fill(random(240,255), random(240,255), random(0,20), random(50,255));
    noStroke();
    ellipse(x, y, w, w);
  }
}