HarmonyOS 能用arc和arcTo方法画一个直径为5vp的半个圆弧吗？

@Entry  
@Component  
struct ArcTo {  
  private settings: RenderingContextSettings = new RenderingContextSettings(true)  
  private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)  
  build() {  
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {  
      Canvas(this.context)  
        .width('100%')  
        .height('100%')  
        .backgroundColor('#ffff00')  
        .onReady(() =>{  
          this.context.moveTo(100, 20)  
          this.context.arcTo(150, 20, 150, 70, 50)  
          this.context.stroke()  
        })  
    }  
    .width('100%')  
    .height('100%')  
  }  
}