suspend fun animateDecay(
    initialVelocity: T,
    animationSpec: DecayAnimationSpec<T>,
    block: (Animatable<T, V>.() -> Unit)? = null
): AnimationResult<T, V> 

interface DecayAnimationSpec<T> {
    fun <V : AnimationVector> vectorize(
        typeConverter: TwoWayConverter<T, V>
    ): VectorizedDecayAnimationSpec<V>
}

private class DecayAnimationSpecImpl<T>(
    private val floatDecaySpec: FloatDecayAnimationSpec
) : DecayAnimationSpec<T> {
    override fun <V : AnimationVector> vectorize(
        typeConverter: TwoWayConverter<T, V>
    ): VectorizedDecayAnimationSpec<V> = VectorizedFloatDecaySpec(floatDecaySpec)
}

fun <T> splineBasedDecay(density: Density): DecayAnimationSpec<T>

// 創(chuàng)建 Animatable 實(shí)例
val animatable = remember { Animatable(10.dp, Dp.VectorConverter) }
val scope = rememberCoroutineScope()
// 創(chuàng)建 splineBasedDecay
// 通過 LocalDensity.current 獲取當(dāng)前設(shè)備屏幕密度
val splineBasedDecay = splineBasedDecay<Dp>(LocalDensity.current)
Box(
    Modifier
        .padding(start = 10.dp, top = animatable.value)
        .size(100.dp, 100.dp)
        .background(Color.Blue)
        .clickable {
            scope.launch {
                // 啟動(dòng)衰減動(dòng)畫，初始速度設(shè)置為 1000.dp 每秒
                animatable.animateDecay(1000.dp, splineBasedDecay)
            }
        }
)

@Composable
actual fun <T> rememberSplineBasedDecay(): DecayAnimationSpec<T> {
    val density = LocalDensity.current
    return remember(density.density) {
        SplineBasedFloatDecayAnimationSpec(density).generateDecayAnimationSpec()
    }
}

fun <T> exponentialDecay(
    frictionMultiplier: Float = 1f,
    absVelocityThreshold: Float = 0.1f
): DecayAnimationSpec<T>

 var move by remember { mutableStateOf(false) }
    val animatable = remember { Animatable(30.dp, Dp.VectorConverter) }
    val scope = rememberCoroutineScope()
    Box(
        Modifier
            .padding(start = 30.dp, top = animatable.value)
            .size(100.dp, 100.dp)
            .background(Color.Blue)
            .clickable {
                scope.launch {
                    // 使用 exponentialDecay 衰減動(dòng)畫
                    animatable.animateDecay(1000.dp, exponentialDecay())
                }
            }
    )

exponentialDecay(5f)

exponentialDecay(absVelocityThreshold = 500f)

// 創(chuàng)建動(dòng)畫實(shí)例
val animatable = remember { Animatable(0, Int.VectorConverter) }
// 獲取協(xié)程作用域用戶在按鈕點(diǎn)擊事件中開啟協(xié)程
val scope = rememberCoroutineScope()
// 中獎(jiǎng)結(jié)果
var luckyResult by remember { mutableStateOf("") }
// 中獎(jiǎng)項(xiàng)
val luckyItem = remember { arrayOf("50元紅包", "20元紅包","10元紅包","100-50券","小米藍(lán)牙耳機(jī)","謝謝參與") }
Column(modifier = Modifier.fillMaxSize(), verticalArrangement = Arrangement.Center, horizontalAlignment = Alignment.CenterHorizontally) {
    Box{
        // 底部圓盤圖片
        Image(
            painter = painterResource(R.drawable.bg),
            contentDescription = "bg",
            // 旋轉(zhuǎn)角度設(shè)置為動(dòng)畫的值
            modifier = Modifier.rotate(animatable.value.toFloat())
        )
        // 中間指針圖片
        Image(
            painter = painterResource(R.drawable.center),
            contentDescription = "center",
            // 設(shè)置點(diǎn)擊事件
            modifier = Modifier.clickable(indication = null, interactionSource = remember { MutableInteractionSource() }, onClick = {
                // 開啟協(xié)程
                scope.launch {
                    // 更新抽獎(jiǎng)狀態(tài)
                    luckyResult = "抽獎(jiǎng)中"
                    // 開啟動(dòng)畫
                    // 初始速度設(shè)置為 10000 再加上 1000~10000 的隨機(jī)數(shù)
                    // 衰減曲線設(shè)置為 exponentialDecay  摩擦系數(shù)設(shè)置為 0.5f
                    val result = animatable.animateDecay(10000 + Random.nextInt(1000,10000), exponentialDecay(frictionMultiplier = 0.5f))
                    // 動(dòng)畫執(zhí)行完后從動(dòng)畫結(jié)果中獲取最后的值，即旋轉(zhuǎn)角度
                    val angle = result.endState.value
                    // 通過計(jì)算獲取當(dāng)前指針在哪個(gè)范圍
                    val index = angle % 360 / 60
                    // 獲取中獎(jiǎng)結(jié)果，并顯示在屏幕上
                    luckyResult = luckyItem[index]
                }
            })
        )
    }
    // 顯示中獎(jiǎng)結(jié)果
    Text(luckyResult, modifier = Modifier.padding(10.dp))
    // 添加重置按鈕
    Button(onClick = {
        scope.launch {
            // 通過 snapTo 瞬間回到初始狀態(tài)
            animatable.snapTo(0)
        }
    }){
        Text("重置")
    }
}