[Flex]源代码实例mp3播放器(2)

// 方案二 
 
<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="OnClick()"> 
 <mx:Script> 
  <![CDATA[ 
   import flash.media.*; 
   import mx.events.SliderEvent ; 
   private var _type:int=2; 
        private var _sound:Sound; 
        private var _channel:SoundChannel; 
  private var posNum:Number=0; 
        private var _spectrumGraph:BitmapData = new BitmapData(256, 60, 
                                             true, 
                                             0x000000aa); 
 
//暂停 
   private function OnPauseClick():void{ 
    posNum=_channel.position; 
     _channel.stop(); 
   } 
 
//停止 
 
   private function OnStopClick():void{ 
    posNum=0; 
     _channel.stop(); 
   } 
 
   private function OnClick():void{ 
    hsldLeft.value=1; 
   //var  spe:Spectrum=new Spectrum(); 
            // Create bitmap for spectrum display 
    
  
           // pnlFrame.addEventListener(Event.ENTER_FRAME, onEnterFrame); 
            _sound = new Sound(new URLRequest("assets/song.mp3")); 
            _channel = _sound.play( posNum ); 
 
   
 
   } 
 
 //输出图形 
         public function onEnterFrame():void 
        { 
          
 
           // Create the byte array and fill it with data 
            var spectrum:ByteArray = new ByteArray(  ); 
            SoundMixer.computeSpectrum(spectrum); 
            
            // Clear the bitmap 
            _spectrumGraph.fillRect(_spectrumGraph.rect, 
                                     0x00000000); 
 
       
            // Create the left channel visualization 
            var i:int; 
            
 
            
            
            if(2==_type){ 
           for(i=0;i<256;i++) { 
                 _spectrumGraph.setPixel32(i, 
                               35 + spectrum.readFloat(  ) * 20, 
                               0xffffffff); 
             } 
            } 
 
            if(1==_type){ 
    
             for(i=0;i<64;i++) { 
              _spectrumGraph.fillRect(new Rectangle(4*i,50-spectrum.readFloat(  ) * 50 ,4,spectrum.readFloat(  ) * 50 ),0xffffffff); 
             } 
            } 
   cns.graphics.beginBitmapFill(_spectrumGraph); 
   cns.graphics.drawRect(0,0,256,60); 
   cns.graphics.endFill();    
    
    
   var curPos:Number=_channel.position; 
   var curLen:Number=_sound.length; 
    
   cns.graphics.beginFill(0x0); 
   cns.graphics.drawRect(0,80,256,10); 
   cns.graphics.endFill(); 
 
   cns.graphics.beginFill(0xa0); 
   cns.graphics.drawRect(0,80,256*curPos/curLen,10); 
   cns.graphics.endFill(); 
 
    
        } 
 
//改变输出图形的 
 
  private function OnCnsClick():void{ 
   _type--; 
   if (0>=_type){ 
    _type=2; 
   } 
  } 
 
//改变声音大小 
  private function OnChangeVolumn( ):void{ 
       var transform:SoundTransform = _channel.soundTransform ; 
   transform.volume =hsldLeft.value; 
   _channel.soundTransform = transform;   
    
   trace("_channel.leftPeak="+_channel.leftPeak*100 +"   "+ "_channel.rightPeak="+_channel.rightPeak*100 
    +"_channel.soundTransform.volume"+_channel.soundTransform.volume*100);    
  } 
   
  
   
  ]]> 
 </mx:Script> 
 
 <mx:Canvas x="0" y="0" width="256" height="84" id="cns" enterFrame="onEnterFrame()" click="OnCnsClick()"> 
 </mx:Canvas> 
 <mx:Button x="0" y="92" label="start" click="OnClick()"/> 
 <mx:Button x="196" y="92" label="stop" click="OnStopClick()"/> 
 <mx:Button x="96" y="92" label="pause" click="OnPauseClick()"/> 
 <mx:HSlider x="10" y="122" height="12" width="237" minimum="0" maximum="2" id="hsldLeft"   change="OnChangeVolumn()" liveDragging="true"/> 
 
  
</mx:Application>