Question

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类来动画补间动画以滚动标题。

问题：卷轴不平滑，非常不稳定，我无法弄清楚原因。

我在网上看到启用位图平滑有帮助，但我不知道如何使用从XML加载的图像来做到这一点。

如果你需要我可以发布它的代码，但它相当长，所以我想如果有人能想到这个波涛汹涌的补间的一些常见原因我最初不会。您可以在我们的某个页面上查看滚动，例如......

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

谢谢！

编辑：请求的代码

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();
}

Answer 1

<强>更新

不要将装载机直接添加到舞台上。（从我的观点来看，这是不好的做法）

addChild(imageLoader);

而是这样做：

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

<强> ORIGINAL

这是平滑位图的方法：

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
}

动画不稳定的原因是它会变慢。

增加Flash动画的FPS。并提高动画的速度。

Answer 2

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;                
        }
    }
  }
}

和一个正在运行的示例：http://wonderfl.net/c/nhhM

欢呼声

Answer 3

如果您想完成程序化动画，我建议您使用TweenLite库（http://www.greensock.com/tweenlite/）。我将在下面编写一个小例子来向您展示动画的容易程度。

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);
}

Flash / Actionscript Tween不顺畅

3 个答案: