1180：調用可能未定義的方法的addEventListener

Question

我會通過一些AS3的訓練，但我發現了一個奇怪的錯誤...

我試圖將事件偵聽器添加到的結束在AS中的補間動畫。

我創建了一個補間，突出顯示框架，右鍵單擊並將補間複製爲AS並將其粘貼到影片剪輯中（我認爲還有更好的方法可以做到這一點，但我不確定它是什麼...）

當我嘗試將偵聽器添加到該代碼的末尾時，出現錯誤。這是我的代碼。

import fl.motion.AnimatorFactory; 
import fl.motion.MotionBase; 
import fl.motion.Motion; 
import flash.filters.*; 
import flash.geom.Point; 
import fl.motion.MotionEvent; 
import fl.events.*; 

var __motion_Enemy_3:MotionBase; 
if(__motion_Enemy_3 == null) { 
    __motion_Enemy_3 = new Motion(); 
    __motion_Enemy_3.duration = 30; 

    // Call overrideTargetTransform to prevent the scale, skew, 
    // or rotation values from being made relative to the target 
    // object's original transform. 
    // __motion_Enemy_3.overrideTargetTransform(); 

    // The following calls to addPropertyArray assign data values 
    // for each tweened property. There is one value in the Array 
    // for every frame in the tween, or fewer if the last value 
    // remains the same for the rest of the frames. 
    __motion_Enemy_3.addPropertyArray("x", [0]); 
    __motion_Enemy_3.addPropertyArray("y", [0]); 
    __motion_Enemy_3.addPropertyArray("scaleX", [1.000000,1.048712,1.097424,1.146136,1.194847,1.243559,1.292271,1.340983,1.389695,1.438407,1.487118,1.535830,1.584542,1.633254,1.681966,1.730678,1.779389,1.828101,1.876813,1.925525,1.974237,2.022949,2.071661,2.120372,2.169084,2.217796,2.266508,2.315220,2.363932,2.412643]); 
    __motion_Enemy_3.addPropertyArray("scaleY", [1.000000,1.048712,1.097424,1.146136,1.194847,1.243559,1.292271,1.340983,1.389695,1.438407,1.487118,1.535830,1.584542,1.633254,1.681966,1.730678,1.779389,1.828101,1.876813,1.925525,1.974237,2.022949,2.071661,2.120372,2.169084,2.217796,2.266508,2.315220,2.363932,2.412643]); 
    __motion_Enemy_3.addPropertyArray("skewX", [0]); 
    __motion_Enemy_3.addPropertyArray("skewY", [0]); 
    __motion_Enemy_3.addPropertyArray("rotationConcat", [0]); 
    __motion_Enemy_3.addPropertyArray("blendMode", ["normal"]); 
    __motion_Enemy_3.addPropertyArray("cacheAsBitmap", [false]); 
__motion_Enemy_3.addEventListener(MotionEvent.MOTION_END, hurtPlayer); 

    // Create an AnimatorFactory instance, which will manage 
    // targets for its corresponding Motion. 
    var __animFactory_Enemy_3:AnimatorFactory = new AnimatorFactory(__motion_Enemy_3); 
    __animFactory_Enemy_3.transformationPoint = new Point(0.499558, 0.500000); 

    // Call the addTarget function on the AnimatorFactory 
    // instance to target a DisplayObject with this Motion. 
    // The second parameter is the number of times the animation 
    // will play - the default value of 0 means it will loop. 
    // __animFactory_Enemy_3.addTarget(<instance name goes here>, 0); 
} 

function hurtPlayer(event:MotionEvent):void { 
this.parent.removeChild(this); 
} 

我試過它的幾個地方，既與animFactory_Enemy_3變量和motion_Enemy_3變量 - 得到相同的錯誤兩次。

Answer 1

我從來沒有使用這個庫，但正如我所看到的運動對象只存儲動畫描述。您需要一個Animator實例，它將爲舞臺上的DisplayObject製作動畫。 Animator類廣播MotionEvents。

我會做到這一點有點像這樣：

import fl.motion.AnimatorFactory; 
    import fl.motion.MotionBase; 
    import fl.motion.Motion; 
    import flash.display.DisplayObjectContainer; 
    import flash.display.Sprite; 
    import flash.motion.Animator; 
    import flash.filters.*; 
    import flash.geom.Point; 
    import fl.motion.MotionEvent; 
    import fl.events.*; 

    var __motion_Enemy_3:MotionBase; 
    var animator:Animator; 

    var spriteToMove:DisplayObjectContainer; 

    if(!spriteToMove) 
    { 
     spriteToMove = new Sprite(); 
     spriteToMove.graphics.beginFill(0xff0000, 1); 
     spriteToMove.graphics.drawRect(0, 0, 50, 50); 
     spriteToMove.graphics.endFill(); 
     addChild(spriteToMove) 
    } 

    if(__motion_Enemy_3 == null) { 
     __motion_Enemy_3 = new Motion(); 
     __motion_Enemy_3.duration = 30; 

     // Call overrideTargetTransform to prevent the scale, skew, 
     // or rotation values from being made relative to the target 
     // object's original transform. 
     // __motion_Enemy_3.overrideTargetTransform(); 

     // The following calls to addPropertyArray assign data values 
     // for each tweened property. There is one value in the Array 
     // for every frame in the tween, or fewer if the last value 
     // remains the same for the rest of the frames. 
     __motion_Enemy_3.addPropertyArray("x", [0]); 
     __motion_Enemy_3.addPropertyArray("y", [0]); 
     __motion_Enemy_3.addPropertyArray("scaleX", [1.000000,1.048712,1.097424,1.146136,1.194847,1.243559,1.292271,1.340983,1.389695,1.438407,1.487118,1.535830,1.584542,1.633254,1.681966,1.730678,1.779389,1.828101,1.876813,1.925525,1.974237,2.022949,2.071661,2.120372,2.169084,2.217796,2.266508,2.315220,2.363932,2.412643]); 
     __motion_Enemy_3.addPropertyArray("scaleY", [1.000000,1.048712,1.097424,1.146136,1.194847,1.243559,1.292271,1.340983,1.389695,1.438407,1.487118,1.535830,1.584542,1.633254,1.681966,1.730678,1.779389,1.828101,1.876813,1.925525,1.974237,2.022949,2.071661,2.120372,2.169084,2.217796,2.266508,2.315220,2.363932,2.412643]); 
     __motion_Enemy_3.addPropertyArray("skewX", [0]); 
     __motion_Enemy_3.addPropertyArray("skewY", [0]); 
     __motion_Enemy_3.addPropertyArray("rotationConcat", [0]); 
     __motion_Enemy_3.addPropertyArray("blendMode", ["normal"]); 
     __motion_Enemy_3.addPropertyArray("cacheAsBitmap", [false]); 

     // Create an AnimatorFactory instance, which will manage 
     // targets for its corresponding Motion. 
     var __animFactory_Enemy_3:AnimatorFactory = new AnimatorFactory(__motion_Enemy_3); 
     __animFactory_Enemy_3.transformationPoint = new Point(0.499558, 0.500000); 

     // Call the addTarget function on the AnimatorFactory 
     // instance to target a DisplayObject with this Motion. 
     // The second parameter is the number of times the animation 
     // will play - the default value of 0 means it will loop. 
     // __animFactory_Enemy_3.addTarget(<instance name goes here>, 0); 
    } 

    /*The Animator instance*/ 
    animator = new Animator(__motion_Enemy_3, spriteToMove); 
    animator.addEventListener(MotionEvent.MOTION_END, onMotionEnd); 

    function onMotionEnd(event:MotionEvent):void { 
    if (spriteToMove) 
    { 
     removeChild(spriteToMove); 
    } 
    } 

一些有用的東西： http://www.kirupa.com/forum/showthread.php?t=258967 http://www.adobe.com/livedocs/flash/9.0/ActionScriptLangRefV3/fl/motion/Animator。 html

我想你應該看看greensock Tweening engine，我很肯定它比這個更容易使用和更有效。

我希望我能幫上忙， 羅布