Question

我有一个精灵加载的图像，图像来自远程位置“http://i.ytimg.com/vi/yre5nBXAxyk/0.jpg”。一旦图像加载到Loader对象中，我就想创建包含图像的sprite的反射。现在这在我在Flash IDE中运行应用程序时有效但是当我将这个Flash应用程序嵌入到HTML页面中时，反射图像不起作用。为什么会这样，代码如下。

////////////////////////////////////////////

// Project：Flash 10 Coverflow //日期：2009年10月3日 //作者：斯蒂芬韦伯 //////////////////////////////////////////// 包{

////////////////////////////////////////////
// IMPORTS
////////////////////////////////////////////
import flash.system.Security;

import flash.external.ExternalInterface;
import flash.display.MovieClip;
import flash.display.Sprite;
import flash.display.DisplayObject;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.geom.Matrix;
import flash.display.GradientType;
import flash.display.SpreadMethod;
import flash.utils.setInterval;
import flash.utils.clearInterval;

public class Reflect extends MovieClip {
    ////////////////////////////////////////////
    // VARIABLES
    ////////////////////////////////////////////

    //reference to the movie clip we are reflecting
    private var _reflectionSprite:Sprite;

    //the BitmapData object that will hold a visual copy of the mc
    private var _bitmapData:BitmapData;

    //the BitmapData object that will hold the reflected image
    private var _reflectionBitmap:Bitmap;

    //the clip that will act as out gradient mask
    private var _gradientMask:MovieClip;

    //how often the reflection should update (if it is video or animated)
    private var _updateTime:Number;

    //the size the reflection is allowed to reflect within
    private var _bounds:Object;

    //the distance the reflection is vertically from the mc
    private var _distance:Number=0;

    function Reflect(args:Object) {


        _reflectionSprite=args.target;

        //the alpha level of the reflection clip
        var alpha:Number=args.alpha/100;

        //the ratio opaque color used in the gradient mask
        var ratio:Number=args.ratio;

        //update time interval
        var _updateTime:Number=args._updateTime;

        //the distance at which the reflection visually drops off at
        var reflectionDropoff:Number=args.reflectionDropoff;

        //the distance the reflection starts from the bottom of the mc
        var _distance:Number=args.distance;

        //store width and height of the clip
        var spriteHeight=_reflectionSprite.height;
        var spriteWidth=_reflectionSprite.width;

        //store the _bounds of the reflection
        _bounds = new Object();
        _bounds.width=spriteWidth;
        _bounds.height=spriteHeight;
        if (_bounds.width>0) {
            //create the BitmapData that will hold a snapshot of the movie clip
            _bitmapData=new BitmapData(_bounds.width,_bounds.height,true,0xFFFFFF);
            _bitmapData.draw(_reflectionSprite);

            //create the BitmapData the will hold the reflection
            _reflectionBitmap=new Bitmap(_bitmapData);
            //flip the reflection upside down
            _reflectionBitmap.scaleY=-1;
            //move the reflection to the bottom of the movie clip
            _reflectionBitmap.y = (_bounds.height*2) + _distance;
            _reflectionSprite.visible = true;
            //add the reflection to the movie clip's Display Stack
            var _reflectionBitmapRef:DisplayObject=_reflectionSprite.addChild(_reflectionBitmap);
            _reflectionBitmapRef.name="_reflectionBitmap";

            //add a blank movie clip to hold our gradient mask
            var gradientMaskRef:DisplayObject = _reflectionSprite.addChild(new MovieClip());
            gradientMaskRef.name="_gradientMask";

            //get a reference to the movie clip - cast the DisplayObject that is returned as a MovieClip
            _gradientMask=_reflectionSprite.getChildByName("_gradientMask") as MovieClip;
            //set the values for the gradient fill
            var fillType:String=GradientType.LINEAR;
            var colors:Array=[0xFFFFFF,0xFFFFFF];
            var alphas:Array=[alpha,0];
            var ratios:Array=[0,ratio];
            var spreadMethod:String=SpreadMethod.PAD;
            //create the Matrix and create the gradient box
            var matr:Matrix = new Matrix();
            //set the height of the Matrix used for the gradient mask
            var matrixHeight:Number;
            if (reflectionDropoff<=0) {
                matrixHeight=_bounds.height;
            } else {
                matrixHeight=_bounds.height/reflectionDropoff;
            }
            matr.createGradientBox(_bounds.width, matrixHeight, (90/180)*Math.PI, 0, 0);
            //create the gradient fill
            _gradientMask.graphics.beginGradientFill(fillType, colors, alphas, ratios, matr, spreadMethod);
            _gradientMask.graphics.drawRect(0,0,_bounds.width,_bounds.height);
            //position the mask over the reflection clip
            _gradientMask.y=_reflectionSprite.getChildByName("_reflectionBitmap").y-_reflectionSprite.getChildByName("_reflectionBitmap").height;
            //cache clip as a bitmap so that the gradient mask will function
            _gradientMask.cacheAsBitmap=true;
            _reflectionSprite.getChildByName("_reflectionBitmap").cacheAsBitmap=true;
            //set the mask for the reflection as the gradient mask
            _reflectionSprite.getChildByName("_reflectionBitmap").mask=_gradientMask;

            //if we are updating the reflection for a video or animation do so here
            if (_updateTime>-1) {
                _updateTime=setInterval(update,_updateTime,_reflectionSprite);
            }
        }
    }


    public function setBounds(w:Number,h:Number):void {
        //allows the user to set the area that the reflection is allowed
        //this is useful for clips that move within themselves
        _bounds.width=w;
        _bounds.height=h;
        _gradientMask.width=_bounds.width;
        redrawBMP(_reflectionSprite);
    }
    public function redrawBMP(_target:Sprite):void {
        // redraws the bitmap reflection - Mim Gamiet [2006]
        _bitmapData.dispose();
        _bitmapData=new BitmapData(_bounds.width,_bounds.height,true,0xFFFFFF);
        _bitmapData.draw(_target);
    }
    private function update(_target:Sprite):void {
        //updates the reflection to visually match the movie clip
        _bitmapData=new BitmapData(_bounds.width,_bounds.height,true,0xFFFFFF);
        _bitmapData.draw(_target);
        _reflectionBitmap.bitmapData=_bitmapData;
    }
    public function destroy():void {
        //provides a method to remove the reflection
        _reflectionSprite.removeChild(_reflectionSprite.getChildByName("_reflectionBitmap"));
        _reflectionBitmap=null;
        _bitmapData.dispose();
        clearInterval(_updateTime);
        _reflectionSprite.removeChild(_reflectionSprite.getChildByName("_gradientMask"));
    }
}

}

Answer 1

var request:URLRequest = new URLRequest ();
request.url = "http://ServerB/images/foo.jpg";

//This is important step..

var loaderContext:LoaderContext = new LoaderContext ();
loaderContext.checkPolicyFile = true;

var loader:Loader = new Loader ();
loader.load (request, loaderContext);

//now you can draw.
var bitmapData:BitampData = new BitmapData (200, 200);
bitmapData.draw (loader);

反射位图未在页面上加载

1 个答案: