Java Sounds.changeVolume示例

  public void tick(int dt) {
    if (plyr.transitioning > -1) return;

    ticker += dt / 1000f;
    if (ticker > 1) ticker = 0;

    if (open == true) {
      if (y <= 0) {
        y = 0;
        return;
      } else {
        y -= (500 / 1000f) * dt;
        float f = 1 - ((((float) closedy - (float) y) / (float) closedy) * .5f);
        sound.changeVolume(f);
      }
    } else {
      if (y >= closedy) {
        y = closedy;
        return;
      } else {
        y += (1000 / 1000f) * dt;
        float f = 1 - ((((float) closedy - (float) y) / (float) closedy) * .5f);
        sound.changeVolume(f);
      }
    }
    if (y <= 0) y = 0;
    if (y >= closedy) y = closedy;

    this.transitioning = (open == true && y > 0) || (open == false && y < closedy) || open;
  }