利用Tweener製作動畫 – 數大便是美
套用徐志摩的名言：「數大」便是美，意思是說數量多就是美，不過雖然數大便是美，但如果要針對多個元件製作動畫，那利用程式一定會比手工來的輕鬆，甚至可以更漂亮和壯觀，以下的範例就是利用Tweener針對較多的元件來製作動畫的結果，分享給大家參考！希望各位未來不會「數大」便是累。
Tweener 滿天星斗：利用Tweener針對星形製作Alpha動畫，是一個很簡單的範例。
import caurina.transitions.Tweener
import flash.display.MovieClip;
setInterval(starFn,50)
function starFn(){
var scale:Number=Math.random()
var mc:MovieClip=new star
mc.x=Math.random()*500
mc.y=Math.random()*500
mc.scaleX=scale
mc.scaleY=scale
mc.alpha=0
addChild(mc)
Tweener.addTween(mc, {alpha:1, time:7, transition:"linear"});
Tweener.addTween(mc, {alpha:0, time:3,delay:8, transition:"linear"});
}
Tweener 擴散效果：利用Tweener針對球體來製作動畫，其中還應用到距離計算的Class，可以試著調整參數（彈出距離變數、彈出數量…等）來觀察改變的情況。
import flash.display.Sprite;
import roMc;
import flash.geom.Point;
import caurina.transitions.Tweener;
//變數定義區塊
var centerPoint:Point = new Point ;//圓形中心點
var i:int = 1;//迴圈變數
var radius:int = 50;//彈出距離變數
var no:int = 20;//彈出數量
var circleArray:Array=new Array//球體陣列（針對移除使用）
var sec:int=1//動畫秒數
var hold:Number=0.1//延遲秒數
centerPoint.x = stage.stageWidth / 2;
centerPoint.y = stage.stageHeight / 2;
stage.addEventListener(MouseEvent.CLICK,clickFn);
function clickFn(e:MouseEvent)
{
while (circleArray.length > 0) {
removeChild(circleArray.pop());
}
Tweener.removeAllTweens();
showFn();
}
function showFn()
{
for (i=1; i<=no; i++)
{
var mc:Sprite = new ball ;
circleArray.push(mc)
var angle:Number = 2 * Math.PI / no * i;
var targetPoint:Point = new Point();
targetPoint.x = radius * Math.cos(angle) + centerPoint.x;
targetPoint.y = radius * Math.sin(angle) + centerPoint.y;
addChild(mc);
mc.x = centerPoint.x;
mc.y = centerPoint.y;
mc.alpha = 0;
Tweener.addTween(mc, {alpha:1,x:targetPoint.x,y:targetPoint.y, time:sec, transition:"linear",delay:i*hold});
Tweener.addTween(mc, {alpha:0,x:centerPoint.x,y:centerPoint.y, time:sec, transition:"linear",delay:i*hold+(no*hold+1)});
}
}
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