HarmonyOS Canvas的动画实现

@Component
struct A {
  @Prop viewWidth: number = 238;
  @Prop viewHeight: number = 238;

  build() {
    Canvas(this.context)
      .width(this.viewWidth)
      .height(this.viewHeight)
      .backgroundColor(Color.Transparent)
      .onReady(() => {
        this.context.clearRect(0, 0, this.viewWidth, this.viewHeight);
      })
      .animation({
        duration: 5000, // 播放时长，默认1000ms
        curve: Curve.EaseOut, // 设置动画曲线
        playMode: PlayMode.Normal
      })
  }
}

上述示例没有动画效果。