actionscript 3.0可見遮罩在可見遮罩對象上

Question

我在我的遊戲中有一個移動的卡車，我希望城市的光線反射（不是背景）在它的身體移動時可見。

站在卡車後面什麼都沒有關係，有的樹木和建築物。

那麼， 我添加背景（不重要）; 然後我把卡車加到舞臺上; 然後我添加另一個具有整個舞臺大小的MovieClip（城市燈光和東西），並將其設置爲卡車的遮罩物。

我不想讓卡車消失，我只是想讓遮罩物體在它上面透出一些透明度;

我知道關於掩蔽，也捕獲我的movieclip作爲位圖，但它不會在我的情況下工作;因爲這裏卡車保持完全可見並且面罩半透明。

請幫助我，我的時間不多了：/

編輯

這是基於我當前的代碼關閉asnwers之一：

var buildingHolder: Sprite = new Sprite; 
this.addChild(buildingHolder); 

var Mask: Sprite = new Sprite() 
Mask = Sprite(buildingHolder); 
Mask.alpha = 1; 
Mask.cacheAsBitmap = true; 
this.addChild(Mask); 

var reflection: MovieClip = new nightSky1Mask; 
reflection.x = 0; 
reflection.y = 480; 
reflection.alpha = .6; 
reflection.scaleX *= 320/reflection.width; 
reflection.scaleY = reflection.scaleX; 
reflection.cacheAsBitmap = true; 
reflection.mask = Mask; 
this.addChild(reflection); 

for (var i: int = 0; i <= 29; i++){ 
//some codes are deleted here 

    var image: MovieClip = new level1Images[i]; 
    image.x = // deleted 
    image.y = // deleted 
    image.scaleX *= 30/image.width * 2; 
    image.scaleY *= 5/image.width * 2; 
    buildingHolder.addChild(image) 
    currLevelImages.push(image) 
} 

Answer 1

你DON 'T想掩蓋卡車。你想要掩蓋的是城市的燈光。

你需要創建一個卡車的副本，並用它掩蓋城市的燈光。

假設你有在出口類的庫位圖作爲TruckImage和你的燈都爲ActionScript導出爲Lights，你可以做這樣的事情：

var truck:Bitmap = new Bitmap(new TruckImage()); 

//scale and position however you'd like 
truck.scaleX = truck.scaleY = .25; 
truck.y = 100; 
addChild(truck);  

var theMask:Bitmap = new Bitmap(truck.bitmapData); 
theMask.cacheAsBitmap = true;//!very important 
theMask.scaleX = theMask.scaleY = truck.scaleX; 
addChild(theMask); //also important 

lights = new Bitmap(new Lights()); 
lights.cacheAsBitmap = true;//!very important 
lights.mask = theMask; 
addChild(lights); 

//let's move the truck and the mask every frame 
addEventListener(Event.ENTER_FRAME,enterFrame); 
function enterFrame(e:Event):void { 
    truck.x = (truck.x + 2) % stage.stageWidth; 
    theMask.x = truck.x; 
} 

編輯

試試像這樣:(創建你的建築物的位圖副本）

var buildingHolder:Sprite = new Sprite(); 
    this.addChild(buildingHolder); 

    //create a bitmap data object and draw the building holder sprite into it (making a copy) 
    var maskBMD:BitmapData = new BitmapData(buildingHolder.width,buildingHolder.height,true,0x00000000); 
    maskBMD.draw(buildingHolder); 

    var msk:Bitmap = new Bitmap(maskBMD,"auto",true); 
    msk.cacheAsBitmap = true; 
    this.addChild(msk); 

    var reflection:MovieClip = new nightSky1Mask; 
    reflection.x = 0; 
    reflection.y = 480; 
    reflection.alpha = .6; 
    reflection.scaleX *= 320/reflection.width; 
    reflection.scaleY = reflection.scaleX; 
    reflection.cacheAsBitmap = true; 
    reflection.mask = msk; 
    this.addChild(reflection); 

    for (var i: int = 0; i <= 29; i++){ 
    //some codes are deleted here 

     var image: MovieClip = new level1Images[i]; 
     image.x = // deleted 
     image.y = // deleted 
     image.scaleX *= 30/image.width * 2; 
     image.scaleY *= 5/image.width * 2; 
     buildingHolder.addChild(image) 
     currLevelImages.push(image) 
    } 

---

或者，你可以做這樣的事情，讓您的建築的兩個副本：

var buildingHolder:Sprite = createBuilding(); 
    var buildingHolderMask:Sprite = createBuilding(false); 

    function createBuilding(addToArray:Boolean = true):Sprite { 
     var building:Sprite = new Sprite(); 

     for (var i: int = 0; i <= 29; i++){ 
     //some codes are deleted here 

      var image: MovieClip = new level1Images[i]; 
      image.x = // deleted 
      image.y = // deleted 
      image.scaleX *= 30/image.width * 2; 
      image.scaleY *= 5/image.width * 2; 
      building.addChild(image) 
      if(addToArray) currLevelImages.push(image) 
     } 
     return building; 
    }