How to switch bgm smoothly about fxgl

[chengenzhao]

Hi:

Current version allow developers to control the Music separately
so you may use an animation to fade out current music
and also fade in another music with another animation
ParallelAnimation could combine two animations together
e.g.

fade in

    var bgm = FXGL.loopBGM("maou_game_theme01.mp3");
    bgm.getAudio().setVolume(0);
    new Transition() {
      {
        setCycleDuration(Duration.seconds(1));
      }

      protected void interpolate(double frac) {
        bgm.getAudio().setVolume(FXGL.getSettings().getGlobalMusicVolume() * frac);
      }
    }.play();

fade out

    var transition = new Transition() {
      {
        setCycleDuration(Duration.seconds(5));
      }

      protected void interpolate(double frac) {
        bgm.getAudio().setVolume(FXGL.getSettings().getGlobalMusicVolume() * (1 - frac));
      }
    };
    transition.setOnFinished(_1 -> bgm.getAudio().stop());
    transition.play();

cheers

[loveqianqian413]

that was cool man , tks a lot! : )