TweenMax MosaicPlugin

Flash製作Mosaic效果還滿常見的
但要給設計師們使用這樣的類別，好像不是那麼容易
就想到TweenMax有Plugin的概念, 讀了一下原理，就自己寫一個
這樣只要會使用TweenMax就可以使用這樣的效果。

線上Demo
需要再下載gs.TweenMax類別才能使用喔
完整程式碼

/**
/**
 * @author milkmidi
 * @see http://milkmidi.blogspot.com
 * @version 1.0.0
 * @date created 2010/04/16/
 */
package milkmidi.tweenmax.plugins {
 import flash.display.*; 
 import flash.geom.*; 
 import gs.plugins.TweenPlugin; 
 import gs.TweenLite;
 public class MosaicPlugin extends TweenPlugin {  
  public static const VERSION :Number = 1.0; 
  public static const API  :Number = 1.0; 
  private var _target  :Sprite;  
  private var _bitmap  :Bitmap;  
  private var _targetWidth:int;
  private var _targetHeight:int;
  private var _startValue :int = 0;
  private var _endValue :int = 20;
  private var _autoDestroy:Boolean = true;
  public function MosaicPlugin() {
   super();
   this.propName = "mosaic";
   this.overwriteProps = ["mosaic"];
   this.onComplete = onCompleteTween;
  }
  override public function onInitTween(pTarget:Object, pValue:*, $tween:TweenLite):Boolean {   
   if (!(pTarget is Sprite)) {
    trace("motionBlur tweens only work for DisplayObjects");
    return false;
   }
   _target = pTarget as Sprite;   
   _bitmap = _target.getChildByName("_mosaic_bitmap") as Bitmap;
   if (_bitmap == null) {    
    _bitmap = new Bitmap();
    _bitmap.name = "_mosaic_bitmap";
   }  
   if (typeof(pValue) != "object") {
    trace("parameter must be object");
    return false;
   }   
   _startValue = pValue.start;
   _endValue = pValue.end;   
   _autoDestroy = (pValue.autoDestroy == undefined) ? true: pValue.autoDestroy ;
   _target.addChild(_bitmap);   
   _targetWidth = _target.width;
   _targetHeight = _target.height;
   return true;
  }  
  public function onCompleteTween():void { 
   if (_autoDestroy==false) 
    return;   
   if(_target.contains(_bitmap))
    _target.removeChild(_bitmap);
   try {
    _bitmap.bitmapData.dispose();
   }catch (err:Error){}   
   _bitmap = null;   
  }
  override public function killProps($lookup:Object):void {
   super.killProps($lookup);
   _autoDestroy = true;
   onCompleteTween();
  }
  override public function get changeFactor():Number { return super.changeFactor; }  
  override public function set changeFactor(value:Number):void {
   super.changeFactor = value;   
   var _pixelSize:Number;      
   if (_startValue < _endValue) 
    _pixelSize = (value * _endValue) + 1 + _startValue;    
   else
    _pixelSize = ((1 - value) * _startValue) + 1 + _endValue;    
   _bitmap.bitmapData = new BitmapData(_targetWidth / _pixelSize, _targetHeight / _pixelSize, false);          
   var _matrix:Matrix = new Matrix();    
   _matrix.scale(1 / _pixelSize, 1 / _pixelSize); 
   _bitmap.visible = false;
   _bitmap.bitmapData.draw(_target, _matrix);    
   _bitmap.visible = true;
   _bitmap.width = _targetWidth;
   _bitmap.height = _targetHeight;
  } 
 }
 
}

測試用程式

/**
* @author milkmidi
* @see http://milkmidi.blogspot
* @version 1.0.1
* @date created 2010/04/15/
*/
package {
import flash.display.*; 
import flash.events.MouseEvent;
import gs.*
import gs.plugins.*;
import gs.easing.*; 
import milkmidi.tweenmax.plugins.MosaicPlugin;
public class MotionBlurPluginDemo extends Sprite {
[Embed(source='demo300x300.jpg')]
public static const Texture:Class;
public function MotionBlurPluginDemo() {
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;

var mc:Sprite = addChild(new Sprite()) as Sprite;
mc.addChild(  new Texture() );
addChild(mc);

TweenPlugin.activate([MosaicPlugin]);
//啟動 MosaicPlugin 
//之後就可以使用 mosaic 屬性
//mosaic 屬性現別必需要是Object, 
//可以使用的參數有 
/*
* start: 開啟的mosaic效果,  
* end:結束的mosaic效果, 
* autoDestroy: 當TweenMax完成時, 是否自動摧毀該效果, 預設值是true
*/ 

mc.addEventListener(MouseEvent.ROLL_OVER , function ():void {
TweenMax.to(mc, .8,
{ 
mosaic: { start:0, end:20 , autoDestroy:false }    
} ); 
});
mc.addEventListener(MouseEvent.ROLL_OUT , function ():void {
TweenMax.to(mc, .8,
{ 
mosaic: { start:20, end:0 }    
} ); 
});
}
}
}