[AS3.0編程教學(xué)]最全的聲音控制方法

精品文檔AS3.0編程教學(xué)最全的聲音控制方法網(wǎng)上做flash音樂播放器的人不少，這個(gè)作品主要是對聲音的外部讀取，然后保存，然后控制播放，暫停，停止等操作，今天這個(gè)作品就是向大家展示這些操作的方法。1. 首先我們新建一個(gè)文件，在舞臺上擺出下面這些按鈕，我們今天對這個(gè)聲音文件的操縱就如按鈕所示：動手之前我們按下Ctrl+Shift+F12,打開ActionScript設(shè)置，將“自動申明舞臺對象”打鉤取消，我們將每個(gè)對象自己用Public聲明，這樣做的好處是開發(fā)時(shí)每個(gè)元件的屬性方便引用和提醒。2. 3我們新建一個(gè)文檔類，首先聲明舞臺上這些按鈕，并定義聲音變量：testSound，控制變量testChannel，testTrans，testPosition。public var btnPlay:SimpleButton;public var btnPause:SimpleButton;public var btnStop:SimpleButton;public var btnQuick:SimpleButton;public var btnVocUp:SimpleButton;public var btnVocDown:SimpleButton;public var btnPanUp:SimpleButton;public var btnPanDown:SimpleButton;private var testSound:Sound;private var testChannel:SoundChannel;private var testTrans:SoundTransform;private var testPosition:Number=0;3. 4首先用下面代碼將一首叫做“test.mp3的音樂加載到舞臺。public function TestSoundMain()testSound = new Sound();testChannel=new SoundChannel();testTrans = new SoundTransform();testSound.load(new URLRequest(test.mp3);testSound.addEventListener(Event.COMPLETE,soundLoadOver);private function soundLoadOver(e:Event):voidtestSound.removeEventListener(Event.COMPLETE, soundLoadOver);soudLoad = true;4. 播放按鈕功能?？刂埔魳凡シ诺陌粹o，單擊后音樂開始播放，并記錄音樂的SoundChannel屬性。為了防止連擊，我們定義一個(gè)isSoundPlay布爾變量判斷音樂是否在播放中。/播放按鈕功能private function playBtnEvent():voidbtnPlay.addEventListener(MouseEvent.CLICK, soundPlay);private function soundPlay(e:MouseEvent):voidif (isSoundPlay) return;isSoundPlay = true;testChannel = testSound.play(testPosition);5. 暫停 按鈕功能，該按鈕讓音樂暫停掉，為了能繼續(xù)播放，我們需要記錄下此時(shí)testChannel的位置，然后播放按鈕單擊時(shí)可以繼續(xù)播放/暫停按鈕功能private function pauseBtnEvent():voidbtnPause.addEventListener(MouseEvent.CLICK, soudPause);private function soudPause(e:MouseEvent):voidif (!isSoundPlay) return;isSoundPlay = false;testPosition = testChannel.position;testChannel.stop();6. 停止按鈕功能，單擊后音樂停止播放，記錄位置歸0./停止按鈕功能private function stopBtnEvent():voidbtnStop.addEventListener(MouseEvent.CLICK, soundStop);private function soundStop(e:MouseEvent):voidisSoundPlay = false;testPosition = 0testChannel.stop();7. 快進(jìn)聲音。單擊該按鈕時(shí)，我們讓聲音從當(dāng)前位置向前播放500毫秒，也就是快進(jìn)半秒。/快進(jìn)按鈕功能private function qucikBtnEvent():voidbtnQuick.addEventListener(MouseEvent.CLICK, soudQuickPlay);private function soudQuickPlay(e:MouseEvent):voidif (!isSoundPlay) return;testPosition = testChannel.position;testChannel.stop();testChannel = testSound.play(testPosition + 500);8. 設(shè)定聲音的音量增加?？刂埔袅烤托枰猻oundTransform對象了，它其實(shí)是testChanel的soundTransform屬性而已，通過它來控制音量。/音量增加private function volumeUpBtnEvent():voidbtnVocUp.addEventListener(MouseEvent.CLICK, upSoudVoc);private function upSoudVoc(e:MouseEvent):voidif (!isSoundPlay) return;testTrans = testChannel.soundTransform;var addedVoc:Number = testTrans.volume 1?1:(testTrans.volume +0.05);testTrans.volume = addedVoc;testChannel.soundTransform = testTrans;9. 設(shè)定聲音的音量減小。/音量減小private function volumeDownBtnEvent():voidbtnVocDown.addEventListener(MouseEvent.CLICK, downSoundVoc);private function downSoundVoc(e:MouseEvent):voidif (!isSoundPlay) return;testTrans = testChannel.soundTransform;var downVoc:Number = testTrans.volume 1?1:(testTrans.pan + 0.05);testTrans.pan = addedPan;testChannel.soundTransform = testTrans;11. 設(shè)定聲音的平衡度向左，點(diǎn)擊此按鈕聲音的平衡性會左移，直到變成左聲道。/平衡向左移動private function panLeftBtnEvent():voidbtnPanDown.addEventListener(MouseEvent.CLICK, downSoundPan);private function downSoundPan(e:MouseEvent):voidif (!isSoundPlay) return;testTrans = testChannel.soundTransform;var downPan:Number = testTrans.pan 0?0:(testTrans.pan - 0.05);testTrans.pan = downPan;testChannel.soundTransform = testTrans;12. 最后別忘了所有你定義的函數(shù)都要寫到音樂加載完成的那個(gè)函數(shù)里執(zhí)行，或者構(gòu)造函數(shù)也可以。就像下面這樣子：/加載音樂并控制播放private function soundLoadOver(e:Event):voidtestSound.removeEventListener(Event.COMPLETE, soundLoadOver);soudLoad = true;playBtnEvent();pauseBtnEvent();stopBtnEvent();qucikBtnEvent();volumeUpBtnEvent();volumeDownBtnEvent();panRightBtnEvent();panLeftBtnEvent();13. 所有這些一個(gè)個(gè)代碼合