当我的球碰到篮筐时如何加分？如何判断球与篮的触感？

Posted 2023-03-06

【中文标题】当我的球碰到篮筐时如何加分？如何判断球与篮的触感？

【英文标题】：How add point when my ball touch basket? how to determine the touch of the ball and basket?

【发布时间】：2021-07-28 20:30:25

【问题描述】：

如何检测球和篮筐的接触并为得分加分？

我有一个球和一个篮筐。篮子在 x 轴上移动。 球 - 按下时的 y 轴

请帮帮我

  override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val basket: ImageView = findViewById(R.id.imageViewBasket)
        val basketball: ImageView = findViewById(R.id.imageViewBasketball)
        val textViewScore: TextView = findViewById(R.id.textViewScore)

        var score = 0

        val wm: WindowManager = windowManager
        val disp: Display = wm.defaultDisplay
        val size = Point()
        disp.getSize(size)

        val screenWidth = size.x
        val screenHeight = size.y

        var ballY = basketball.y
        var ballX = basketball.x
        val basketX = basket.x
        val basketY = basket.y
        var ballCenterX = ballX + basketball.width /2f
        val ballCenterY = ballY + basketball.height /2

        val animationFromLeftToRight = TranslateAnimation(0f, 750f, 0f, 0f)
        animationFromLeftToRight.apply 
            duration = 2000
            repeatMode = Animation.RELATIVE_TO_PARENT
            repeatCount = -1
        
        basket.startAnimation(animationFromLeftToRight)

        basketball.setOnClickListener 
            val ballUp = TranslateAnimation(0f, 0f, 0f, -1500f)
            ballUp.apply 
                duration = 700
                repeatMode = Animation.RESTART
            
            basketball.startAnimation(ballUp)
        

    

【参考方案1】：

您可以发布一个可运行的对象来检查所有内容的当前位置，然后在最后重新发布它自己，以便它在每个滴答声中运行

// you'll probably have to calculate TOLERANCE based on screen density since it's pixels
fun Int.isCloseEnoughTo(other: Int) = abs(this - other) <= TOLERANCE

fun nothingButNet(): Boolean = 
    basketball.x.isCloseEnoughTo(basket.x) && basketball.y.isCloseEnoughTo(basket.y)

val basketCheck = object : Runnable 
    override fun run() 
        if (nothingButNet()) handleScore()
        basket.post(this)
    


basketCheck.run()

我很懒，只是将其发布在视图（篮子）上，但如果您愿意，可以获取 Handler。

更好的方法是使用animation listener、ValueAnimator.AnimatorUpdateListener 来执行此操作 - 该链接会告诉您如何操作。实现onAnimationUpdate 并在那里进行检查，而不是不断发布可运行文件 - 这样检查仅在动画运行时发生。这意味着使用value animator 至少为一件事（可能是球）设置动画，这需要更多的工作

【讨论】：

非常感谢！当您可以实现此功能时，我会通知您）再次感谢您）