Flash AS3）分享一个ActionScript3的倒影类

再此之前一段时间我曾分享过一个Flex版本的倒影类，接受uicompnent组件作为倒影目标，参考《Flex）一个Flex倒影组件类 Reflactor.as 的使用》！因为用到了一些mx类包下的类及事件，对纯flash组件无法直接支持。

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这篇将分享一个ActionScript3 所写的倒影类，支持DisplayObject做为倒影目标，未用到flex相关类包

直接上代码后再解释:

/**
 * 倒影类 Reflexion 
 */
package taotao.bitmap {
import flash.display.*;
import flash.events.*;
import flash.geom.*;
public class Reflexion extends Sprite {
private var _disTarget:DisplayObject;
private var _numStartFade:Number = .3;
private var _numMidLoc:Number = .5;
private var _numEndFade:Number = 0;
private var _numSkewX:Number = 0;
private var _numScale:Number = 1;        
private var _bmpReflect:Bitmap;
// Constructor
/**
* 构造函数 
* @param set_disTarget 目标
* @param set_numStartFade
* @param set_numMidLoc
* @param set_numEndFade
* @param set_numSkewX
* @param set_numScale
* 
*/
public function Reflexion(set_disTarget:DisplayObject,set_numStartFade:Number=0.4,set_numMidLoc:Number=0.2,set_numEndFade:Number=0,set_numSkewX:Number=0,set_numScale:Number=1) {
    super()
    _disTarget = set_disTarget;
    _numStartFade = set_numStartFade;
    _numMidLoc = set_numMidLoc;
    _numEndFade = set_numEndFade;
    _numSkewX = set_numSkewX;
    _numScale = set_numScale;
    _bmpReflect = new Bitmap(new BitmapData(1,1,true,0));
    this.addChild(_bmpReflect);
    createReflection();
}

// Create reflection
private function createReflection(event:Event = null):void {
    // Reflection
    var bmpDraw:BitmapData = new BitmapData(_disTarget.width,_disTarget.height,0);
    var matSkew:Matrix = new Matrix(1,_numSkewX,-1 * _numScale,_disTarget.height);
    var recDraw:Rectangle = new Rectangle(0,_disTarget.width,_disTarget.height * (2 - _numScale));
    var potSkew:Point = matSkew.transformPoint(new Point(0,_disTarget.height));
    matSkew.tx = potSkew.x * -1;
    matSkew.ty = (potSkew.y - _disTarget.height) * -1;
    bmpDraw.draw(_disTarget,matSkew,null,recDraw,true);
    // Fade
    var shpDraw:Shape = new Shape();
    var matGrad:Matrix = new Matrix();
    var arrAlpha:Array = new Array(_numStartFade,(_numStartFade - _numEndFade) / 2,_numEndFade);
    var arrMatrix:Array = new Array(0,0xFF * _numMidLoc,0xFF);
    matGrad.createGradientBox(_disTarget.width,0.5 * Math.PI);
    shpDraw.graphics.beginGradientFill(GradientType.LINEAR,new Array(0,0),arrAlpha,arrMatrix,matGrad)
    shpDraw.graphics.drawRect(0,_disTarget.height);
    shpDraw.graphics.endFill();
    bmpDraw.draw(shpDraw,BlendMode.ALPHA);
    _bmpReflect.bitmapData.dispose();
    _bmpReflect.bitmapData = bmpDraw;
    _bmpReflect.filters = _disTarget.filters;
    this.x = _disTarget.x;
    this.y = (_disTarget.y + _disTarget.height) - 1;          
}

public function reDraw():void
{
    this.createReflection();
}
}
}

1、以上类参考了Dustin Andrew所写的倒影类，同时增加了一个reDraw方法，用于根据需要重绘倒影

2、使用时用类似如下方法：

var myRef:Reflexion = new Reflexion(disImg,.4,.2,1);

sprCon.addChild(myRef); ? ?

其中disImg是目标显示对象，sprCon是disImg的容器，同时也将是倒影的容器。这是一个范例效果截图：

更改你的Reflexion参数数值以达到不同效果！

（本文完）