如何在框架

Question

我试图弹跳球。我使用这个example:

但是我没有处理类文件，我正在尝试使用框架代码。这就是我到目前为止所做的。

import flash.display.MovieClip;
import flash.display.Stage;
import flash.events.Event;
import flash.events.KeyboardEvent;
import Ball;

var nSpeedX:Number;
var nSpeedY:Number;

var nStageWidth:Number = 500;
var nStageHeight:Number = 400;

var NSpeedX:Number;
var NSpeedY:Number;


var mcBallContainer:MovieClip;

var MCBallA:MovieClip;
var MCBallB:MovieClip;

var nNumBalls:Number = 1;


stage.addEventListener(Event.ENTER_FRAME,BallCollision);
function BallCollision(oly:Event) {

    mcBallContainer = new MovieClip ( ) ;
            mcBallContainer.x = mcBallContainer.y = 0;
            stage.addChild(mcBallContainer);

            this.addEventListener ( Event.ENTER_FRAME, enterFrameHandler );

            for (var i = 0; i < nNumBalls; i++) 
            {
                var mcBall:Ball = new Ball ( Math.floor ( ( Math.random() * 1 ) - 4 ), Math.floor ( ( Math.random() * 12 ) - 4 ) );
                mcBall.x = Math.random() * nStageWidth;
                mcBall.y = Math.random() * nStageHeight;
                mcBallContainer.addChild ( mcBall );
            }
    stage.removeEventListener(Event.ENTER_FRAME,BallCollision) //Fixed
}

function enterFrameHandler(oly:Event) {

    for ( var i = 0; i < mcBallContainer.numChildren; i++ ) 
            {
                var mcBall1:* = mcBallContainer.getChildAt( i );

                for ( var j = i + 1; j < mcBallContainer.numChildren; j++ )
                {
                    var mcBall2:* = mcBallContainer.getChildAt( j );

                    var nDistX:Number = Math.abs ( mcBall1.x - mcBall2.x );
                    var nDistY:Number = Math.abs ( mcBall1.y - mcBall2.y );
                    var nDistance:Number = Math.sqrt ( nDistX * nDistX + nDistY * nDistY );

                    if ( nDistance < 20 )
                    {
                        solveBalls ( mcBall1, mcBall2 );
                    }
                }
}


//

function solveBalls ( MCBallA:MovieClip, MCBallB:MovieClip ) : void{



            var nX1:Number = MCBallA.x;
            var nY1:Number = MCBallA.y;
            var nDistX:Number = MCBallB.x - nX1;
            var nDistY:Number = MCBallB.y - nY1;

            var nDistance:Number = Math.sqrt ( nDistX * nDistX + nDistY * nDistY );
            var nRadiusA:Number = MCBallA.width/2;
            var nRadiusB:Number = MCBallB.width/2;
            //var nRadius:Number = 10;

            var nNormalX:Number = nDistX/nDistance;
            var nNormalY:Number = nDistY/nDistance;

            var nMidpointX:Number = ( nX1 + MCBallB.x )/2;
            var nMidpointY:Number = ( nY1 + MCBallB.y )/2;

            MCBallA.x = nMidpointX - nNormalX * nRadiusA;
            MCBallA.y = nMidpointY - nNormalY * nRadiusA;
            MCBallB.x = nMidpointX + nNormalX * nRadiusB;
            MCBallB.y = nMidpointY + nNormalY * nRadiusB;

            var nVector:Number = ( ( MCBallA.nSpeedX - MCBallB.nSpeedX ) * nNormalX )+ ( ( MCBallA.nSpeedY - MCBallB.nSpeedY ) * nNormalY );
            var nVelX:Number = nVector * nNormalX;
            var nVelY:Number = nVector * nNormalY;

            MCBallA.nSpeedX -= nVelX;
            MCBallA.nSpeedY -= nVelY;
            MCBallB.nSpeedX += nVelX;
            MCBallB.nSpeedY += nVelY;
}

}

我的代码正在运作，但是球的数量超过应有的数量。球不会相互碰撞。我的代码有什么问题??

更新感谢@Organis