Actionscript 3 如何将重力/摩擦力添加到球对象，使其不会'；不要陷入无人的困境'；s-land？

我最近在我的skee ball风格游戏的编码上有了突破。我在碰撞检测方面遇到了严重的问题，stackoverflow的专家帮我解决了这个问题。我正在为我的对象，一个球，编写一个二人组，以创建一个平滑的滚动效果，因为我无法让它以其他方式平滑移动。我终于有了一个灵光乍现的时刻，并设法使物体逐渐移动，而不是心灵传送，并能够消除我的吐温。没有了tween，碰撞检测工作正常。但我仍然有一些问题。首先，我如何使重力/摩擦力作用于球，使其在没有碰撞（或得分）的区域内不会停止，否则会失去蒸汽？第二，我如何使它与边界正确碰撞，从而以适当的速率反转方向？还有三个，虽然有点不相关，但仍然是一个重大挑战，所以我现在要提一下：如果我的碰撞区域（得分目标）垂直对齐，我可以在碰撞检测中设置条件来测试与目标有效碰撞的速度吗？我如何确定速度

好的，这是我目前滚动球并击中目标的摆动代码：

function moveBall(event:MouseEvent):void
{
    if (this.mouseX <= 172 + gameTable.tableLane.width)
    {
        ball.x = this.mouseX;
    }
    else
    {
        ball.x = 172 + gameTable.tableLane.width;
    }
    if (this.mouseX < 200)
    {
        ball.x = 200;
    }
    //trace(this.mouseX)
}

function releaseBall(event:MouseEvent):void
{
    //rollBall();
    ballSpeed = rollPower * 10;
    //set minimum roll distance
    if (ballSpeed < 313)
    {
        ballSpeed = 313;
    }
    ballStop = ball.y - ballSpeed;
    gameElements.addEventListener(Event.ENTER_FRAME, rollBall);
    gameElements.addEventListener(Event.ENTER_FRAME, ballTargetScore);
    gameElements.removeEventListener(MouseEvent.MOUSE_MOVE, moveBall);
}



function rollBall(event:Event):void
{
    trace("ballSpeed is " + ballSpeed);
    trace("ballStop is " + ballStop);
    if (ball.y > ballStop)
    {
        ball.y -= 6;
        ball.y += friction;
    }

}



//match targets to scoring values which should be tied to determineScore()
function ballTargetScore(event:Event):void
{
    var targetValue:String;
    var targetArray:Array = new Array(gameTable.upperScoringArea.upperScoringAreaCTarget,
      gameTable.upperScoringArea.upperScoringAreaLtTarget,
      gameTable.upperScoringArea.upperScoringAreaRtTarget,
      gameTable.middleScoringArea.middleScoringAreaTargetTop,
      gameTable.middleScoringArea.middleScoringAreaTargetMiddle,
      gameTable.middleScoringArea.middleScoringAreaTargetLower,
      gameTable.lowerScoringArea.lowerScoringAreaTarget);
    var targetTextArray:Array =  new Array(gameTable.upperScoringArea.upperScoringAreaC_text.text,
        gameTable.upperScoringArea.upperScoringAreaLt_text.text,
        gameTable.upperScoringArea.upperScoringAreaRt_text.text,
        gameTable.middleScoringArea.middleScoringAreaU_text.text,
        gameTable.middleScoringArea.middleScoringAreaM_text.text,
        gameTable.middleScoringArea.middleScoringAreaL_text.text,
        gameTable.lowerScoringArea.lowerSA_text.text);

    for (var i:uint; i < targetArray.length; i++)
    {
        if (targetArray[i] != null)
        {
            trace("targetArray value is " + targetArray[i]);
            if (ball.hitTestObject(targetArray[i]))
            {
                targetValue = targetTextArray[i];
                trace('targetValue becomes',targetValue);
                determineScore(targetValue);
                gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);
            }
        }
    }


}

以及我的相关全球VAR列表：

//physics vars
var rollPower:Number = 0;
var speed:Number = 1;//speed of ball on roll
var ballSpeed:Number;
var ballStop:Number;
var friction:Number = 0.15;
var gravity:Number = 0.70;

---

好的，我已经把它修好了，但是它在视觉上仍然很凌乱。球现在将向后移动。我的意思是，当球到达一个表示桌上排水沟的阈值时，球将被移除；但是，flash似乎没有足够快地运行条件语句，以便在球在视觉上移动超过y值之前接住球。它确实把球移走了，但它看起来很难看，因为球在消失之前已经滚回了球道。我怎样才能加快状况检查的时间

这是我修改过的代码。欢迎指点

function rollBall(event:Event):void
{
    trace("ballSpeed is " + ballSpeed);
    trace("ballStop is " + ballStop);
    if (ball.y > ballStop)
    {
        ball.y -=  6;
        ball.y +=  friction;
    }
    else
    {
        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
        gameElements.addEventListener(Event.ENTER_FRAME, rollBackwards);
    }

}//end rollBall

function rollBackwards(event:Event):void
{
    trace("rollBackwards is in effect");
    trace("ball.y is " + ball.y);
    if (ball.y < 313)
    {
        ball.y +=  6 + gravity;
        if (ball.y >= 313)
        {
            gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);
            determineScore(null);
        }
    }
}//end rollBackwards

函数滚球（事件：事件）：无效
{
轨迹（“球速为”+球速）；
跟踪（“球挡为”+球挡）；
如果（ball.y>ballStop）
{
ball.y-=6；
球。y+=摩擦力；
}
其他的
{
gameElements.removeEventListener（Event.ENTER_FRAME，rollBall）；
gameElements.addEventListener（Event.ENTER_FRAME，rollbackup）；
}
}//端滚球
函数向后滚动（事件：事件）：void
{
跟踪（“回滚生效”）；
轨迹（“ball.y是”+ball.y）；
如果（球y<313）
{
球。y+=6+重力；
如果（球y>=313）
{
gameElements.removeEventListener（Event.ENTER_FRAME，ballTargetScore）；
确定性核心（空）；
}
}
}//结束向后滚动

---

好的，我想在这里更新一下。我基本上通过调整Y坐标“解决”了回滚计时问题。我要么测量错误，要么我的方向与我应该移动的方向相反。现在它基本上可以工作了

function rollBackwards(event:Event):void
{
    //trace("rollBackwards is in effect");
    //trace("ball.y is " + ball.y);
    if (ball.y < 240)
    {
        ball.y +=  6 + gravity;
        if (ball.y >= 235)
        {
            gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);
            determineScore(null);
        }
    }
}//end rollBackwards

函数向后滚动（事件：事件）：无效
{
//跟踪（“回滚生效”）；
//轨迹（“ball.y是”+ball.y）；
如果（球y<240）
{
球。y+=6+重力；
如果（球y>=235）
{
gameElements.removeEventListener（Event.ENTER_FRAME，ballTargetScore）；
确定性核心（空）；
}
}
}//结束向后滚动

看起来仍然有点难看的是，球在与目标碰撞后何时/何地被移走。我的，也许是笨拙的条件坐标链计算很大程度上是从有效性POV开始的，但是球似乎总是在实际碰撞被测量之前被移除了几个像素（？），甚至考虑到边界框而不是实际形状。我还试图在球被移走之前把它变成一个二人球，让它在一个漂亮的庄园里消失，但这似乎从未奏效。我甚至从未尝试过将每个目标下的弧形“保险杠”变成实际的碰撞物体，如果目标关闭，球可以滚动。这只是放在“太硬”的篮子里。下面是我的碰撞测量和粗花呢的代码，以防有人有任何敏锐的洞察力来补充。否则，我对最终结果比较满意

//called during determineScore event
function disappearBall():void
{
    myBallTween = new Tween(ball,"alpha",Strong.easeOut,ball.y + 5,ball.y,8,false);
    myBallTween.obj.alpha = 0;
    myBallTween.start();
}//end disappearBall

function ballTargetScore(event:Event):void
{
    var targetValue:String;
    var targetArray:Array = new Array(gameTable.upperScoringArea.upperScoringAreaCTarget,
      gameTable.upperScoringArea.upperScoringAreaLtTarget,
      gameTable.upperScoringArea.upperScoringAreaRtTarget,
      gameTable.middleScoringArea.middleScoringAreaTargetTop,
      gameTable.middleScoringArea.middleScoringAreaTargetMiddle,
      gameTable.middleScoringArea.middleScoringAreaTargetLower,
      gameTable.lowerScoringArea.lowerScoringAreaTarget);
    var targetTextArray:Array =  new Array(gameTable.upperScoringArea.upperScoringAreaC_text.text,
        gameTable.upperScoringArea.upperScoringAreaLt_text.text,
        gameTable.upperScoringArea.upperScoringAreaRt_text.text,
        gameTable.middleScoringArea.middleScoringAreaU_text.text,
        gameTable.middleScoringArea.middleScoringAreaM_text.text,
        gameTable.middleScoringArea.middleScoringAreaL_text.text,
        gameTable.lowerScoringArea.lowerSA_text.text);

    for (var i:uint; i < targetArray.length; i++)
    {
        if (targetArray[i] != null)
        {
            //trace("targetArray value is " + targetArray[i]);
            if (ball.hitTestObject(targetArray[i]))
            {
                //handle vertically aligned targets
                if (centerTargetArray.indexOf(targetArray[i]) >= 0)
                {
                    var centerIndex:uint = centerTargetArray.indexOf(targetArray[i]);
                    //trace("centerTargetArray check works " + centerTargetArray[centerIndex]);
                    if (ballStop <= 60 && ball.hitTestObject(gameTable.upperScoringArea.upperScoringAreaCTarget))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                    if (ballStop > 60 && ball.hitTestObject(gameTable.middleScoringArea.middleScoringAreaTargetTop))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                    if (ballStop > 100 && ball.hitTestObject(gameTable.middleScoringArea.middleScoringAreaTargetMiddle))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                    if (ballStop > 135 && ball.hitTestObject(gameTable.middleScoringArea.middleScoringAreaTargetLower))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                    if (ballStop > 161 && ball.hitTestObject(gameTable.lowerScoringArea.lowerScoringAreaTarget))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                }
                else
                {
                    targetValue = targetTextArray[i];
                    //trace('targetValue becomes',targetValue);
                    determineScore(targetValue);
                    gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                    gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);
                }
            }
        }
    }
}//end ballTargetScore

//在determineScore事件期间调用
函数消失球（）：void
{
myBallTween=新的Tween（ball，“alpha”，Strong.easeOut，ball.y+5，ball.y，8，false）；
myBallTween.obj.alpha=0；
myBallTween.start（）；
}//结束消失球
功能ballTargetScore（事件：事件）：无效
{
var targetValue：字符串；
var targetArray:Array=新数组（gameTable.upperScoringArea.upperscoringreactarget，
gameTable.upperScoringArea.UpperScoringRealtTarget，
gameTable.upperScoringArea.UpperScoringArattarget，
gameTable.middleScoringArea.middleScoringAreaTargetTop，
gameTable.middleScoringArea.middleScoringAreaTargetMiddle，
gameTable.middleScoringArea.middleScoringAreaTargetLower，
可玩。lowerScoringArea。LowersCoringAreat目标）；
var targetTextArray:Array=新数组（gameTable.upperScoringArea.upperScoringArea\u text.text，
gameTable.upperScoringArea.UpperScoringRealt_text.text，
gameTable.upperScoringArea.UpperScoringArart_text.text，
gameTable.middleScoringArea.middleScoringArea\u text.text，
gameTable.middleScoringArea.middleScoringAreaM_text.text，
gameTable.middleScoringArea.MiddleScoringReal_text.text，
gameTable.lowerScoringArea.LowersAra_text.text）；
for（变量i:uint；i=0）
{
var centerIndex:uint=centerTargetArray.indexOf（targetArray[i]）；
//called during determineScore event
function disappearBall():void
{
    myBallTween = new Tween(ball,"alpha",Strong.easeOut,ball.y + 5,ball.y,8,false);
    myBallTween.obj.alpha = 0;
    myBallTween.start();
}//end disappearBall

function ballTargetScore(event:Event):void
{
    var targetValue:String;
    var targetArray:Array = new Array(gameTable.upperScoringArea.upperScoringAreaCTarget,
      gameTable.upperScoringArea.upperScoringAreaLtTarget,
      gameTable.upperScoringArea.upperScoringAreaRtTarget,
      gameTable.middleScoringArea.middleScoringAreaTargetTop,
      gameTable.middleScoringArea.middleScoringAreaTargetMiddle,
      gameTable.middleScoringArea.middleScoringAreaTargetLower,
      gameTable.lowerScoringArea.lowerScoringAreaTarget);
    var targetTextArray:Array =  new Array(gameTable.upperScoringArea.upperScoringAreaC_text.text,
        gameTable.upperScoringArea.upperScoringAreaLt_text.text,
        gameTable.upperScoringArea.upperScoringAreaRt_text.text,
        gameTable.middleScoringArea.middleScoringAreaU_text.text,
        gameTable.middleScoringArea.middleScoringAreaM_text.text,
        gameTable.middleScoringArea.middleScoringAreaL_text.text,
        gameTable.lowerScoringArea.lowerSA_text.text);

    for (var i:uint; i < targetArray.length; i++)
    {
        if (targetArray[i] != null)
        {
            //trace("targetArray value is " + targetArray[i]);
            if (ball.hitTestObject(targetArray[i]))
            {
                //handle vertically aligned targets
                if (centerTargetArray.indexOf(targetArray[i]) >= 0)
                {
                    var centerIndex:uint = centerTargetArray.indexOf(targetArray[i]);
                    //trace("centerTargetArray check works " + centerTargetArray[centerIndex]);
                    if (ballStop <= 60 && ball.hitTestObject(gameTable.upperScoringArea.upperScoringAreaCTarget))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                    if (ballStop > 60 && ball.hitTestObject(gameTable.middleScoringArea.middleScoringAreaTargetTop))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                    if (ballStop > 100 && ball.hitTestObject(gameTable.middleScoringArea.middleScoringAreaTargetMiddle))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                    if (ballStop > 135 && ball.hitTestObject(gameTable.middleScoringArea.middleScoringAreaTargetLower))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                    if (ballStop > 161 && ball.hitTestObject(gameTable.lowerScoringArea.lowerScoringAreaTarget))
                    {
                        targetValue = targetTextArray[i];
                        //trace('targetValue becomes ' + targetValue);
                        determineScore(targetValue);
                        gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                        gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);

                    }
                }
                else
                {
                    targetValue = targetTextArray[i];
                    //trace('targetValue becomes',targetValue);
                    determineScore(targetValue);
                    gameElements.removeEventListener(Event.ENTER_FRAME, rollBall);
                    gameElements.removeEventListener(Event.ENTER_FRAME, ballTargetScore);
                }
            }
        }
    }
}//end ballTargetScore

ballX += ballSpeedX;
ballY += ballSpeedY;
if(onGround())
{
if(ballSpeedX > friction)
    ballSpeedX -= friction;
else if(ballSpeedX < - friction)
    ballSpeedX += friction;
else ballSpeedX = 0;
}

if(!onGround()) ballSpeedY -= gravity;
else ballSpeedX -= gravity * Math.cos(slopeAngle);

//do something about ballSpeedY when it hits the ground..
if(ballSpeedY < 0 && onGround()) ballSpeedY *= -0.5;