实现弧形菜单功能鸿蒙示例代码 原创

Column() {
  Stack() {
    ForEach(this.imageList, (item: string, index: number) => {
      Image($r(item))
        .width(this.ImageWidth)
        .height(this.ImageHeight)
        .border({ color: "#FFF", width: 2 })
        .position({
          x: this.points[index][0],
          y: this.points[index][1]
        })
        .objectFit(ImageFit.Auto)
        .rotate({ centerX: 100 / 2, centerY: 200 / 2, angle: this.getAngele(index) })
        .zIndex(this.imageList.length - index)
        .id(`${index}`)
    })
  }
  //centerY = 图片高度 + 圆的半径
  .rotate({ angle: this.stackAngle, centerY: 200 + 100 })
}.height('100%')
  .width('100%')
  .backgroundColor("#ffa7a7a7")
  .gesture(
    PanGesture(this.panOption)
      .onActionStart((event: GestureEvent) => {
        Logger.info('Pan start ' + event.offsetX)
        let info = event.fingerList[0]
        this.x1 = px2vp(this.screenWidth) / 2 - info.globalX
        this.y1 = 200 + 100 - info.globalY
        Logger.info('Pan start ' + this.x1 + ' ' + this.y1)
      })
      .onActionEnd((event: GestureEvent) => {
        Logger.info('Pan start ' + event.offsetY)
        Logger.info('Pan start ' + this.x2 + ' ' + this.y2)
      })
      .onActionUpdate((event: GestureEvent) => {
        Logger.info('this.stackAngle = ' + this.stackAngle)
        if (event) {
          let info = event.fingerList[0]
          this.x2 = px2vp(this.screenWidth) / 2 - info.globalX
          this.y2 = 200 + 100 - info.globalY
          this.distance = Math.sqrt((event.offsetX) * (event.offsetX) + (event.offsetY) * (event.offsetY))
          if ((this.x1 * this.y2 - this.x2 * this.y1) > 0) {
            this.stackAngle = (this.stackAngle + (this.distance / 60)) % 360
          } else {
            this.stackAngle = (this.stackAngle - (this.distance / 60)) % 360
          }
        }
      })
  )

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