HarmonyOS 如何实现WaveView动画？

语音搜索的时候，按住语音按钮，下面的背景有水波纹的动画效果。

HarmonyOS

zbw_apple

2024-09-27 11:19:15

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回答 1

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回答 1

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Heiang

@Entry  
@Component  
struct Page240423185507109 {  
  private settings: RenderingContextSettings = new RenderingContextSettings(true)  
  private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)  
  waveSpeed: number = 0.03  
  phase: number = 0  
  
  drawWave() {  
    this.context?.clearRect(0, 0, this.context.width, this.context.height)  
  
    this.context?.beginPath()  
    for (let x = 0; x <= this.context.width; x += 10) {  
      const y = this.context.height / 2 + Math.sin(x * 0.01 + this.phase) * 20  
      this.context?.lineTo(x, y)  
    }  
    this.context?.lineTo(this.context.width, this.context.height)  
    this.context?.lineTo(0, this.context.height)  
    this.context?.closePath()  
  
    this.context.fillStyle = '#30007bff'  
    this.context?.fill()  
  
    this.context?.beginPath()  
    for (let x = 0; x <= this.context.width; x += 10) {  
      const y = this.context.height / 2 + Math.sin(x * 0.02 + this.phase) * 10  
      this.context?.lineTo(x, y)  
    }  
    this.context?.lineTo(this.context.width, this.context.height)  
    this.context?.lineTo(0, this.context.height)  
    this.context?.closePath()  
  
    this.context.fillStyle = '#50007bff'  
    this.context?.fill()  
  
    this.context?.beginPath()  
    for (let x = 0; x <= this.context.width; x += 10) {  
      const y = this.context.height / 2 + Math.sin(x * 0.015 + this.phase) * 30  
      this.context?.lineTo(x, y)  
    }  
    this.context?.lineTo(this.context.width, this.context.height)  
    this.context?.lineTo(0, this.context.height)  
    this.context?.closePath()  
  
    this.context.fillStyle = '#20007bff'  
    this.context?.fill()  
  
    this.phase += this.waveSpeed  
  }  
  
  build() {  
    Column() {  
      Canvas(this.context)  
        .width(200)  
        .height(100)  
        .backgroundColor(Color.Pink)  
        .onReady(() => {  
          setInterval(this.drawWave.bind(this), 20)  
        })  
    }.width("100%").height("100%").justifyContent(FlexAlign.Center)  
  }  
}

具体实现逻辑：

this.context?.beginPath()  
for (let x = 0; x <= this.context.width; x += 10) {  
  const y = this.context.height / 2 + Math.sin(x * 0.01 + this.phase) * 20  
  this.context?.lineTo(x, y)  
}  
this.context?.lineTo(this.context.width, this.context.height)  
this.context?.lineTo(0, this.context.height)  
this.context?.closePath()  
  
this.context.fillStyle = '#30007bff'  
this.context?.fill()

这一段代码，就是一条水波纹。

2024-09-27 17:06:56

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HarmonyOS 如何实现WaveView动画？

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