Compose自定义View实现宇智波斑写轮眼

目录

• 正文
• 先实现功能效果
• 调用传入不同的delay值

正文

本章节是Compose自定义绘制的第二章，画的是一个之前设计给的一个比较复杂的，设计所谓的会呼吸的动画，那时候实现花了蛮长的时间，搬着电脑跟设计一帧一帧地对，没多久后来需求就被拿掉了，至于文章的标题哈哈随意起了一个，长得有点像而已。

Compose的实现，图形本身跟上一章节的LocationMarker其实差不太多，倒过来了而已，调整了P1跟P3, 基本图形的Path，这里不再做介绍，读者也可以去看代码实现。主要介绍一下动画吧。

首先看一下gif动图：

整个图形分三层，最底层是灰色的背景，没有动画实现。

先实现功能效果

第二层是一个层变的动画，每层有个delay的不同延迟，对alpha最一个ObjectAnimator.ofFloat(water1, "alpha", 0f, 0.5f, 0.2f, 1f)渐变的动画，0.5f 到0.2f, 再到1f这个地方展现出所谓的呼吸的感觉。Compose目前写的不多，有些冗余代码没有抽象，先实现了功能效果。

@Composable
fun drawWaterDrop(){
  val waterDropModel by remember {
  mutableStateOf(WaterDropModel.waterDropM)
  }
  val color1 = colorResource(id = waterDropModel.water1.colorResource)
  val color2 = colorResource(id = waterDropModel.water2.colorResource)
  val color3 = colorResource(id = waterDropModel.water3.colorResource)
  val color4 = colorResource(id = waterDropModel.water4.colorResource)
  val color5 = colorResource(id = waterDropModel.water5.colorResource)
  val color6 = colorResource(id = waterDropModel.water6.colorResource)
  val color7 = colorResource(id = waterDropModel.water7.colorResource)
  val color8 = colorResource(id = waterDropModel.water8.colorResource)
  val animAlpha1 = remember { Animatable(0f, Float.VectorConverter) }
  val animAlpha2 = remember { Animatable(0f, Float.VectorConverter) }
  val animAlpha3 = remember { Animatable(0f, Float.VectorConverter) }
  val animAlpha4 = remember { Animatable(0f, Float.VectorConverter) }
  val animAlpha5 = remember { Animatable(0f, Float.VectorConverter) }
  val animAlpha6 = remember { Animatable(0f, Float.VectorConverter) }
  val animAlpha7 = remember { Animatable(0f, Float.VectorConverter) }
  val animAlpha8 = remember { Animatable(0f, Float.VectorConverter) }
    LaunchedEffect(Unit){
        animAlpha1.animateTo(1f, animationSpec = myKeyframs(0))
    }
    LaunchedEffect(Unit){
        animAlpha2.animateTo(1f, animationSpec = myKeyframs(1))
    }
    LaunchedEffect(Unit){
        animAlpha3.animateTo(1f, animationSpec = myKeyframs(2))
    }
    LaunchedEffect(Unit){
        animAlpha4.animateTo(1f, animationSpec = myKeyframs(3))
    }
    LaunchedEffect(Unit){
        animAlpha5.animateTo(1f, animationSpec = myKeyframs(4))
    }
    LaunchedEffect(Unit){
        animAlpha6.animateTo(1f, animationSpec = myKeyframs(5))
    }
    LaunchedEffect(Unit){
        animAlpha7.animateTo(1f, animationSpec = myKeyframs(6))
    }
    LaunchedEffect(Unit){
        animAlpha8.animateTo(1f, animationSpec = myKeyframs(7))
    }
  Canvas(modifier = Modifier.fillMaxSize()){
  val contentWidth = size.width
  val contentHeight = size.height
  withTransform({
  translate(left = contentWidth / 2, top = contentHeight / 2)}) {
  drawPath(AndroidPath(waterDropModel.water8Path), color = color8, alpha = animAlpha8.value)
  drawPath(AndroidPath(waterDropModel.water7Path), color = color7, alpha = animAlpha7.value)
  drawPath(AndroidPath(waterDropModel.water6Path), color = color6, alpha = animAlpha6.value)
  drawPath(AndroidPath(waterDropModel.water5Path), color = color5, alpha = animAlpha5.value)
  drawPath(AndroidPath(waterDropModel.water4Path), color = color4, alpha = animAlpha4.value)
  drawPath(AndroidPath(waterDropModel.water3Path), color = color3, alpha = animAlpha3.value)
  drawPath(AndroidPath(waterDropModel.water2Path), color = color2, alpha = animAlpha2.value)
  drawPath(AndroidPath(waterDropModel.water1Path), color = color1, alpha = animAlpha1.value)
  }
  }
}
private fun myKeyframs(num:Int):KeyframesSpec<Float>{
    return keyframes{
        durationMillis = 3000
        delayMillis = num * 2000
        0.5f at 1000 with LinearEasing
        0.2f at 2000 with LinearEasing
    }
}

调用传入不同的delay值

然后就是外层扫光的动画，像探照灯一样一圈圈的扫，一共扫7遍，代码跟层变动画差不多，也是对alpha值做渐变，目前代码是调用扫光动画7次，后续看看如何优化性能。每次调用传入不同的delay值即可。

@Composable
fun drawWaterDropScan(delayTime:Long){
    val waterDropModel by remember {
        mutableStateOf(WaterDropModel.waterDropMScan)
    }
    val color1 = colorResource(id = waterDropModel.water1.colorResource)
    val color2 = colorResource(id = waterDropModel.water2.colorResource)
    val color3 = colorResource(id = waterDropModel.water3.colorResource)
    val color4 = colorResource(id = waterDropModel.water4.colorResource)
    val color5 = colorResource(id = waterDropModel.water5.colorResource)
    val color6 = colorResource(id = waterDropModel.water6.colorResource)
    val color7 = colorResource(id = waterDropModel.water7.colorResource)
    val color8 = colorResource(id = waterDropModel.water8.colorResource)
    val animAlpha2 = remember { Animatable(0f, Float.VectorConverter) }
    val animAlpha3 = remember { Animatable(0f, Float.VectorConverter) }
    val animAlpha4 = remember { Animatable(0f, Float.VectorConverter) }
    val animAlpha5 = remember { Animatable(0f, Float.VectorConverter) }
    val animAlpha6 = remember { Animatable(0f, Float.VectorConverter) }
    val animAlpha7 = remember { Animatable(0f, Float.VectorConverter) }
    val animAlpha8 = remember { Animatable(0f, Float.VectorConverter) }
    LaunchedEffect(Unit){
        delay(delayTime)
        val map = mutableMapOf<Float, Int>().apply { put(1f, 350) }
        animAlpha2.animateTo(0f, animationSpec = myKeyframs2(700, 0, map))
    }
    LaunchedEffect(Unit){
        delay(delayTime)
        val map = mutableMapOf<Float, Int>().apply { put(0.8f, 315) }
        animAlpha3.animateTo(0f, animationSpec = myKeyframs2(630, 233, map))
    }
    LaunchedEffect(Unit){
        delay(delayTime)
        val map = mutableMapOf<Float, Int>().apply { put(0.55f, 315) }
        animAlpha4.animateTo(0f, animationSpec = myKeyframs2(630, 383, map))
    }
    LaunchedEffect(Unit){
        delay(delayTime)
        val map = mutableMapOf<Float, Int>().apply { put(0.5f, 325) }
        animAlpha5.animateTo(0f, animationSpec = myKeyframs2(650, 533, map))
    }
    LaunchedEffect(Unit){
        delay(delayTime)
        val map = mutableMapOf<Float, Int>().apply { put(0.45f, 325) }
        animAlpha6.animateTo(0f, animationSpec = myKeyframs2(650, 667, map))
    }
    LaunchedEffect(Unit){
        delay(delayTime)
        val map = mutableMapOf<Float, Int>().apply { put(0.35f, 283) }
        animAlpha7.animateTo(0f, animationSpec = myKeyframs2(567, 816, map))
    }
    LaunchedEffect(Unit){
        delay(delayTime)
        val map = mutableMapOf<Float, Int>().apply { put(0.3f, 216) }
        animAlpha8.animateTo(0f, animationSpec = myKeyframs2(433, 983, map))
    }
  Canvas(modifier = Modifier.fillMaxSize()){
  val contentWidth = size.width
  val contentHeight = size.height
  withTransform({
  translate(left = contentWidth / 2, top = contentHeight / 2)
  }) {
  drawPath(AndroidPath(waterDropModel.water8Path), color = color8, alpha = animAlpha8.value)
  drawPath(AndroidPath(waterDropModel.water7Path), color = color7, alpha = animAlpha7.value)
  drawPath(AndroidPath(waterDropModel.water6Path), color = color6, alpha = animAlpha6.value)
  drawPath(AndroidPath(waterDropModel.water5Path), color = color5, alpha = animAlpha5.value)
  drawPath(AndroidPath(waterDropModel.water4Path), color = color4, alpha = animAlpha4.value)
  drawPath(AndroidPath(waterDropModel.water3Path), color = color3, alpha = animAlpha3.value)
  drawPath(AndroidPath(waterDropModel.water2Path), color = color2, alpha = animAlpha2.value)
  drawPath(AndroidPath(waterDropModel.water1Path), color = color1)
  }
  }
}
private fun myKeyframs2(durationMillisParams:Int, delayMillisParams:Int, frames:Map<Float, Int>):KeyframesSpec<Float>{
    return keyframes{
        durationMillis = durationMillisParams
        delayMillis = delayMillisParams
        for ((valueF, timestamp) in frames){
           valueF at timestamp
        }
    }
}
@Preview
@Composable
fun WaterDrop(){
    Box(modifier = Modifier.fillMaxSize()){
        drawWaterDropBg()
        drawWaterDrop()
        for (num in 1 .. 7){
            drawWaterDropScan(delayTime = num * 2000L)
        }
    }
}

代码跟LocationMarker在一个Project里面，暂时没有添加导航。github.com/yinxiucheng… 下的CustomerComposeView.

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