HarmonyOS ohos.graphics.drawing (绘制模块)中Path.arcTo有例子可以参考吗？

import { RenderNode, DrawContext, FrameNode, NodeController } from "@ohos.ArkUI.node" 
import drawing from "@ohos.graphics.drawing" 
 
class TextRenderNode extends RenderNode { 
  async draw(context: DrawContext) { 
    const canvas = context.canvas; 
    const pen = new drawing.Pen(); 
    pen.setStrokeWidth(5); 
    pen.setColor({alpha: 255, red: 255, green: 0, blue: 0}); 
    let path = new drawing.Path(); 
    // path.moveTo(10,10); 
    path.arcTo(10, 10, 200, 200, 0, 270); 
    // path.close(); 
    canvas.attachPen(pen); 
    canvas.drawPath(path); 
    canvas.detachPen(); 
  } 
} 
 
class MyNodeController extends NodeController { 
  private rootNode: FrameNode | null = null; 
  private nodeArray: Array<TextRenderNode> = [] 
  addMyNode(item:TextRenderNode){ 
    this.nodeArray.push(item) 
  } 
 
  makeNode(uiContext: UIContext): FrameNode | null { 
    this.rootNode = new FrameNode(uiContext); 
    const renderNode = this.rootNode.getRenderNode(); 
    if (renderNode === null) { 
      return this.rootNode; 
    } 
    if (renderNode) { 
      renderNode.clearChildren() 
      this.nodeArray.forEach((item) => { 
        renderNode.appendChild(item) 
      }) 
    } 
    return this.rootNode; 
  } 
} 
 
@Entry 
@Component 
struct Index { 
  @State newNode:TextRenderNode = new TextRenderNode(); 
  @State nodeCV:MyNodeController = new MyNodeController() 
  tempY = 0 
  build() { 
    Column() { 
      Column() { 
        NodeContainer(this.nodeCV) 
          .width('100%') 
          .height(200) 
        Button('Invalidate') 
          .onClick(() => { 
            let newNode = new TextRenderNode() 
            newNode.frame = { x: 0, y: this.tempY, width: 200, height: 100 } 
            this.nodeCV.addMyNode(newNode) 
            this.nodeCV.rebuild() 
            this.tempY += 100 
          }) 
      } 
      .width('100%') 
      .height('100%') 
    } 
    .height('100%') 
  } 
}
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