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我正在使用 Flash - Actionscript 3.0 - 从 XML 文件加载图像路径（最终是图像），然后我使用 Tweener 类对补间进行动画处理以在标题中滚动。

问题：滚动不平滑，非常不稳定，我不知道为什么。

我在网上看到启用位图平滑有帮助，但我不知道如何处理从 XML 加载的图像。

如果您需要代码，我可以发布它，但它相当长，所以我想如果有人能想到这个断断续续的补间的一些常见原因，我最初不会。您可以在我们的其中一个页面上查看卷轴，例如...

http://community.greencupboards.com/2011/07/15/lions-fighting-extinction/

谢谢！

编辑：要求的代码

import fl.transitions.Tween;
import fl.transitions.easing.*;
import fl.transitions.TweenEvent;
import caurina.transitions.*

var imageLoader:Loader;
var currentLoader:Loader;
var xml:XML;
var xmlList:XMLList;
var xmlLoader:URLLoader = new URLLoader();
var xmlLoader2:URLLoader = new URLLoader();
var k:int;
var iterator:int = 0;
var imageCount:int;

//********** Begin editable region *************///
//---------------------------------------------
//dont change startX unless you are sure -> 
//start coordinates are affected by more than this variable
var startX:Number = 690;
//change endX to extend the scroll length
var endX:Number = 20;
//change scrollSpeed to change speed of images
var scrollSpeed:Number = 32;
//---------------------------------------------
//********** End editable region **************///

var ratio:Number = scrollSpeed/(startX-endX);
var rate:Number = (startX-endX)/scrollSpeed;

//align tabs under heading
setChildIndex(headertab,1);

// ----- Program Main ----- //
initializeMouseEvents();
Main_Begin();

//@ initializes mouse events for url navigation
function initializeMouseEvents():void
{
Mouse.cursor = flash.ui.MouseCursor.BUTTON
headertab.addEventListener(MouseEvent.ROLL_OVER, expandTab);
headertab.addEventListener(MouseEvent.ROLL_OUT, shrinkTab);
function expandTab(e:MouseEvent):void
{
    Tweener.addTween(headertab, {y:5, time:.1, delay:0, transition:"linear"});
}
function shrinkTab(e:MouseEvent):void
{
    Tweener.addTween(headertab, {y:0, time:.1, delay:0, transition:"linear"});
}
stage.addEventListener(MouseEvent.CLICK, onClick);
function onClick(e:MouseEvent):void
{
    navigateToURL(new URLRequest("http://www.greencupboards.com"), "_blank");
}
}

function Main_Begin():void
{
xmlLoader.load(new URLRequest("http://www.greencupboards.com/media/community/scroll/images.xml"));
xmlLoader.addEventListener(Event.COMPLETE, loadInitialXml);

function loadInitialXml(event:Event):void
{
    xml = XML(event.target.data);
    xmlList = xml.children();
    imageCount = xmlList.length();
    for(var j:int = 1; j < 10; j++)
    {
        k = imageCount - j;
        imageLoader = new Loader();
        imageLoader.name = "loader"+j;
        imageLoader.load(new URLRequest(xmlList[k].source));
        imageLoader.x = endX + 60*(j+1) + 10;
        imageLoader.y = 37;
        //imageLoader.addEventListener(MouseEvent.ROLL_OVER, pauseAll);
        //imageLoader.addEventListener(MouseEvent.ROLL_OUT, resumeAll);
        addChild(imageLoader);
        setChildIndex(imageLoader,1);
        //Tweener.addTween(imageLoader, {alpha:1, time:1.4, delay:0, transition:"linear"});
        Tweener.addTween(imageLoader, {x:endX, time:rate*(j+1)/7.2, delay:0, transition:"linear"});
        Tweener.addTween(imageLoader, {alpha:0, time:2, delay:(rate*(j+1)/7.5)-4, transition:"linear"});
        imageLoader.unload();
    }

    //first scrolling images to fade in
    loadXML();
    //loop of scrolling images infinetely
    function loop():void 
    {
        loadXML();
    }
    setInterval(loop,(  ((imageCount*60))/rate)*1000   );

//imageLoader.name = xmlList[i].attribute("source");
}
}

function loadXML()
{
xmlLoader2.load(new URLRequest("http://www.greencupboards.com/media/community/scroll/images.xml"));
xmlLoader2.addEventListener(Event.COMPLETE, xmlLoaded);

function xmlLoaded(event:Event):void
{
    xml = XML(event.target.data);
    xmlList = xml.children();
    imageCount = xmlList.length();
    for(var i:int = 0; i < xmlList.length(); i++)
    {
        imageLoader = new Loader();
        imageLoader.name = "loader"+i;
        imageLoader.load(new URLRequest(xmlList[i].source));
        imageLoader.x = startX + 60*i;
        imageLoader.y = 37;
        imageLoader.alpha = -1;
        //imageLoader.addEventListener(MouseEvent.ROLL_OVER, pauseAll);
        //imageLoader.addEventListener(MouseEvent.ROLL_OUT, resumeAll);
        addChild(imageLoader);
        setChildIndex(imageLoader,1);
        makeTween(imageLoader);
        iterator++;
    }
iterator = 0;
//imageLoader.name = xmlList[i].attribute("source");
}
}

function resumeAll(event:Event):void
{
    Tweener.resumeAllTweens();
}

function pauseAll(event:Event):void
{
    Tweener.pauseAllTweens();
}

function makeTween(obj:Loader):void
{
Tweener.addTween(obj, {alpha:1, time:2, delay:60*ratio*iterator+3.3, transition:"linear"});
Tweener.addTween(obj, {x:endX, time:(scrollSpeed + 60*ratio*iterator), delay:0, transition:"linear", onComplete:unloadObject(obj)});
}

function unloadObject(obj:Object):void
{
//iterator - 2 simply creates a big enough delay.  I think the scroll gets ahead of fadeout so it needs this buffer to run many times
Tweener.addTween(obj, {alpha:0, time:2, delay:(scrollSpeed + 60*ratio*(iterator-2)), transition:"linear"});
obj.unload();
}
4

3 回答 3

1

更新

不要将加载程序直接添加到阶段。（从我的角度来看是不好的做法）

addChild(imageLoader);

而是这样做：

imageLoader.loaderInfo.addEventListener ( Event.COMPLETE, handleLoadComplete );

原来的

这是您可以平滑位图的方法：

private function handleLoadComplete ( e : Event ) : void
{
    imageLoader.loaderInfo.removeEventListener( Event.COMPLETE, handleLoadComplete );
    var bitmap:Bitmap = Bitmap (loader.content); //get the loaders content as a bitmap
    bitmap.smoothing = true;//turn on smoothing
    location.addChilc ( bitmap ) // add the bitmap to you desired location
}

你的动画断断续续的原因是它太慢了。

增加您的 Flash 电影的 FPS。并提高动画的速度。

于 2011-07-20T15:47:55.160 回答
1

有时，更好的动画制作方法是使用 ENTER_FRAME 事件手动制作动画。

我的建议：摆脱 Tweener 并编写自己的动画循环。

package 
{
  import flash.display.Sprite;
  import flash.events.Event;

  [SWF(width="400", height="100", frameRate="30", backgroundColor="#FFFFFF")]
  public class Main extends Sprite
  {
    private var items : Array;
    public function Main()
    {
        items = [];
        var curx:int = 0;
        // create some items
        for (var i:int=0;i<10;i++)
        {
            var s:Sprite = new Sprite();
            s.x = curx;
            s.graphics.beginFill(0xff0000*i/10, 1);
            s.graphics.drawRect(0, 0, 20, 40);
            items.push(s);

            addChild(s);
            curx += s.width + 6;
        }
        addEventListener(Event.ENTER_FRAME, onEnterFrame);
    }

    private function onEnterFrame(event : Event) : void 
    {
        var i:int = items.length-1;
        var s:Sprite;
        while (i >= 0)
        {
            s = items[i] as Sprite;
            if (s.x <= -20) {
                s.x = stage.stageWidth;
            }
            s.x -= 2;
            --i;                
        }
    }
  }
}

和一个运行示例：http ://wonderfl.net/c/nhhM

干杯

于 2011-07-20T20:13:29.817 回答
0

If you want programmatic animation done, I would recommend to use the TweenLite-library (http://www.greensock.com/tweenlite/). I will code a small example below to show you how easy the animation can be.

private function startAnimation():void
{
    for each(var yourImage:Bitmap in SomeArrayYouCollectTheImagesIn)
    {
        TweenLite.to(yourImage, timeItShouldTake, {x: X-PositionToGoTo, onComplete: someFunction, onCompleteParams: [yourImage]});
    }
}

private function someFunction(image:Bitmap):void
{
    //You can reposition your image here
}

private function stopAnimation(image:Bitmap):void
{
    TweenLite.killTweensOf(image);
}
于 2011-07-22T08:16:06.673 回答