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我想创建一组随机对象以循环跌落舞台。

到目前为止,我已经创建了一个测试对象以随机 x 坐标下降。我无法弄清楚如何循环下降函数,以便对象的多个实例连续下降。

var randomX:Number = Math.random() * 800;

test_mc.x = randomX;
test_mc.y = 0;

var speed:Number = 10;

test_mc.addEventListener(Event.ENTER_FRAME, moveDown);

function moveDown(e:Event):void
{
 e.target.y += speed; 

 if(e.target.y >= 480)
 {
      test_mc.removeEventListener(Event.ENTER_FRAME, moveDown);
 }
}
4

2 回答 2

2

参考我的落雪效果代码。

雪的起始位置都是随机的,效果几乎和真实的雪落情况一样。如果你跑,你会感到惊讶。

The Snow is My Custom MovieClip(白色圆形,宽 15,高 15)

这是我的演示:SnowEffect

这是我的资料来源:SnowEffect Down

this.addEventListener( Event.ENTER_FRAME, onEnter );

function onEnter( e: Event ):void {

    var s: Snow = new Snow();
    s.x=550*Math.random();
    s.y=-20;
    s.width=s.height=1+9*Math.random();// 1 ~ 9

    s.xSpeed=-2+4*Math.random();// -2 ~ 2
    s.ySpeed=1+4*Math.random();// 1 ~ 5

    s.at = -0.001 -0.001*Math.random();
    s.vt = 0;
    this.addChild( s );

    s.addEventListener( Event.ENTER_FRAME, onSnowEnter );
}

function onSnowEnter( e: Event ):void {
    var s:Snow=e.currentTarget as Snow;
    s.x+=s.xSpeed;
    s.y+=s.ySpeed;


    if (s.y>=480) {
        s.addEventListener( Event.ENTER_FRAME, onMeltingEnter );
    }
}

function onMeltingEnter( e: Event ): void {
    var s:Snow=e.currentTarget as Snow;
    this.addChild( s );
    s.removeEventListener( Event.ENTER_FRAME, onSnowEnter );
    s.vt += s.at;
    s.alpha += s.vt;
    if ( s.alpha <=0){
        s.removeEventListener( Event.ENTER_FRAME, onMeltingEnter );
        this.removeChild( s );
    }

}
于 2012-08-09T17:55:09.743 回答
1

创建一堆对象,将它们添加到数组中,然后循环遍历数组:

var numOfObjects:int = 10;
var fallingObjectArray:Array = [];
var speed:Number = 10;

// Add 10 falling objects to the display and to the array
for(var i:int = 0; i < numOfObjects; i++) {
   var fallingObject:Sprite = new Sprite();
   fallingObject.graphics.beginFill(0xFF0000);
   fallingObject.graphics.drawCircle(0, 0, 15);
   fallingObject.graphics.endFill();
   addChild(fallingObject);
   fallingObject.x = Math.random() * stage.stageWidth;
   fallingObjectArray.push(fallingObject);
}

addEventListener(Event.ENTER_FRAME, moveDown);

function moveDown(e:Event):void
{    
   // Go through all the objects in the array and move them down
   for each(var fallingObject in fallingObjectArray) {
      fallingObject.y += speed;
      // If the object is past the screen height, remove it from display and array
      if(fallingObject.y+fallingObject.height >= stage.stageHeight) {
         removeChild(fallingObject);
         fallingObjectArray.splice(fallingObjectArray.indexOf(fallingObject), 1);
      }
   }
   // Once all objects have fallen off the screen, remove the listener
   if(fallingObjectArray.length <= 0) {
      removeEventListener(Event.ENTER_FRAME, moveDown);
   }
}

上面的代码只是使用红色圆圈——你必须使用你拥有的任何图像(除非你喜欢红色圆圈......)。

于 2012-08-09T17:54:38.783 回答