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我有这个在菜单上播放的背景音乐。startBtn每当玩家选择“开始”按钮 ( )时，我想让它平滑地淡出。你是怎样做的？这是我的代码：

import flash.events.Event;
import flash.events.MouseEvent;
import flash.system.fscommand;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.net.URLRequest;
import flash.events.Event;
import flash.media.SoundTransform;
import flash.events.MouseEvent;

//Declare MUSIC Variables
var musicSelection:Sound;
var musicChannel:SoundChannel;
var musicTrack:String = "music/dearly_beloved.mp3";
var musicVolume:Number=0.2;
/*var isMuted = false;*/

loadMusic();
function loadMusic():void 
{
    //first stop old sound playing
    SoundMixer.stopAll();
    musicSelection = new Sound();
    musicChannel = new SoundChannel();
    //create and load the required soun
    musicSelection.load(new URLRequest(musicTrack));
    //when loaded - play it
    musicSelection.addEventListener(Event.COMPLETE, musicLoaded);
}

function musicLoaded(evt:Event):void
{
    //finished with this listener
    musicSelection.removeEventListener(Event.COMPLETE, musicLoaded);
    //play music
    playMusic();
}

function playMusic():void
{
    //play the random or selected music
    musicChannel = musicSelection.play();
    //setting the volume control property to the music channel
    musicChannel.soundTransform = new SoundTransform(musicVolume, 0);
    //but add this one to make repeats
    musicChannel.addEventListener(Event.SOUND_COMPLETE, playAgain);
}

function playAgain(evt:Event):void
{
    // remove this listener and repeat
    musicChannel.removeEventListener(Event.SOUND_COMPLETE, playAgain);
    playMusic();
}

这是第二帧的代码：

import flash.events.Event;
import flash.media.SoundTransform;

stop();

optionBtn.addEventListener(MouseEvent.CLICK, goToOption)
function goToOption(event:MouseEvent):void
{
    nextFrame();
}

startBtn.addEventListener(MouseEvent.MOUSE_DOWN, stopMusic);
function stopMusic(event:MouseEvent):void
{
    musicChannel.soundTransform = new SoundTransform(musicVolume, 0);
    while (musicVolume > 0)
    {
        musicVolume--;
    }
}

quitBtn.addEventListener(MouseEvent.MOUSE_DOWN, closeGame);
function closeGame(event:MouseEvent):void 
{
    fscommand("quit");
}
4

2 回答 2

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使用 while... 只会立即减少音乐 - 在一帧中。您需要做的是添加 ENTER_FRAME 事件，并在其中减少音乐。像这样的东西：

addEventListener(Event.ENTER_FRAME, onLoop);

var _oldTime:Number = 0;
private function onLoop(e:Event):void
{
   var resultTime:Number = getTimer() - oldTime;
   if(resultTime > 200 )
   {
      musicVolume -= 0.1;
      oldTime += resultTime;
      if(musicVolume <= 0) 
      {
        removeEventListener(Event.ENTER_FRAME,onLoop);
      } 
   }
}

根据您想要的速度，尝试不同的值来降低音量或何时降低（结果时间 > 200 -> 200ms）

于 2012-10-22T17:09:23.540 回答
0

您可以使用 TweenMax 补间音量：

http://www.greensock.com

http://forums.greensock.com/topic/4753-volume-fade-outs/page_hl_volume _ _

于 2012-10-22T18:59:53.983 回答